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/**
* @license
* Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
// @version 0.5.1
window.PolymerGestures = {};
(function(scope) {
var HAS_FULL_PATH = false;
// test for full event path support
var pathTest = document.createElement('meta');
if (pathTest.createShadowRoot) {
var sr = pathTest.createShadowRoot();
var s = document.createElement('span');
sr.appendChild(s);
pathTest.addEventListener('testpath', function(ev) {
if (ev.path) {
// if the span is in the event path, then path[0] is the real source for all events
HAS_FULL_PATH = ev.path[0] === s;
}
ev.stopPropagation();
});
var ev = new CustomEvent('testpath', {bubbles: true});
// must add node to DOM to trigger event listener
document.head.appendChild(pathTest);
s.dispatchEvent(ev);
pathTest.parentNode.removeChild(pathTest);
sr = s = null;
}
pathTest = null;
var target = {
shadow: function(inEl) {
if (inEl) {
return inEl.shadowRoot || inEl.webkitShadowRoot;
}
},
canTarget: function(shadow) {
return shadow && Boolean(shadow.elementFromPoint);
},
targetingShadow: function(inEl) {
var s = this.shadow(inEl);
if (this.canTarget(s)) {
return s;
}
},
olderShadow: function(shadow) {
var os = shadow.olderShadowRoot;
if (!os) {
var se = shadow.querySelector('shadow');
if (se) {
os = se.olderShadowRoot;
}
}
return os;
},
allShadows: function(element) {
var shadows = [], s = this.shadow(element);
while(s) {
shadows.push(s);
s = this.olderShadow(s);
}
return shadows;
},
searchRoot: function(inRoot, x, y) {
var t, st, sr, os;
if (inRoot) {
t = inRoot.elementFromPoint(x, y);
if (t) {
// found element, check if it has a ShadowRoot
sr = this.targetingShadow(t);
} else if (inRoot !== document) {
// check for sibling roots
sr = this.olderShadow(inRoot);
}
// search other roots, fall back to light dom element
return this.searchRoot(sr, x, y) || t;
}
},
owner: function(element) {
if (!element) {
return document;
}
var s = element;
// walk up until you hit the shadow root or document
while (s.parentNode) {
s = s.parentNode;
}
// the owner element is expected to be a Document or ShadowRoot
if (s.nodeType != Node.DOCUMENT_NODE && s.nodeType != Node.DOCUMENT_FRAGMENT_NODE) {
s = document;
}
return s;
},
findTarget: function(inEvent) {
if (HAS_FULL_PATH && inEvent.path && inEvent.path.length) {
return inEvent.path[0];
}
var x = inEvent.clientX, y = inEvent.clientY;
// if the listener is in the shadow root, it is much faster to start there
var s = this.owner(inEvent.target);
// if x, y is not in this root, fall back to document search
if (!s.elementFromPoint(x, y)) {
s = document;
}
return this.searchRoot(s, x, y);
},
findTouchAction: function(inEvent) {
var n;
if (HAS_FULL_PATH && inEvent.path && inEvent.path.length) {
var path = inEvent.path;
for (var i = 0; i < path.length; i++) {
n = path[i];
if (n.nodeType === Node.ELEMENT_NODE && n.hasAttribute('touch-action')) {
return n.getAttribute('touch-action');
}
}
} else {
n = inEvent.target;
while(n) {
if (n.nodeType === Node.ELEMENT_NODE && n.hasAttribute('touch-action')) {
return n.getAttribute('touch-action');
}
n = n.parentNode || n.host;
}
}
// auto is default
return "auto";
},
LCA: function(a, b) {
if (a === b) {
return a;
}
if (a && !b) {
return a;
}
if (b && !a) {
return b;
}
if (!b && !a) {
return document;
}
// fast case, a is a direct descendant of b or vice versa
if (a.contains && a.contains(b)) {
return a;
}
if (b.contains && b.contains(a)) {
return b;
}
var adepth = this.depth(a);
var bdepth = this.depth(b);
var d = adepth - bdepth;
if (d >= 0) {
a = this.walk(a, d);
} else {
b = this.walk(b, -d);
}
while (a && b && a !== b) {
a = a.parentNode || a.host;
b = b.parentNode || b.host;
}
return a;
},
walk: function(n, u) {
for (var i = 0; n && (i < u); i++) {
n = n.parentNode || n.host;
}
return n;
},
depth: function(n) {
var d = 0;
while(n) {
d++;
n = n.parentNode || n.host;
}
return d;
},
deepContains: function(a, b) {
var common = this.LCA(a, b);
// if a is the common ancestor, it must "deeply" contain b
return common === a;
},
insideNode: function(node, x, y) {
var rect = node.getBoundingClientRect();
return (rect.left <= x) && (x <= rect.right) && (rect.top <= y) && (y <= rect.bottom);
},
path: function(event) {
var p;
if (HAS_FULL_PATH && event.path && event.path.length) {
p = event.path;
} else {
p = [];
var n = this.findTarget(event);
while (n) {
p.push(n);
n = n.parentNode || n.host;
}
}
return p;
}
};
scope.targetFinding = target;
/**
* Given an event, finds the "deepest" node that could have been the original target before ShadowDOM retargetting
*
* @param {Event} Event An event object with clientX and clientY properties
* @return {Element} The probable event origninator
*/
scope.findTarget = target.findTarget.bind(target);
/**
* Determines if the "container" node deeply contains the "containee" node, including situations where the "containee" is contained by one or more ShadowDOM
* roots.
*
* @param {Node} container
* @param {Node} containee
* @return {Boolean}
*/
scope.deepContains = target.deepContains.bind(target);
/**
* Determines if the x/y position is inside the given node.
*
* Example:
*
* function upHandler(event) {
* var innode = PolymerGestures.insideNode(event.target, event.clientX, event.clientY);
* if (innode) {
* // wait for tap?
* } else {
* // tap will never happen
* }
* }
*
* @param {Node} node
* @param {Number} x Screen X position
* @param {Number} y screen Y position
* @return {Boolean}
*/
scope.insideNode = target.insideNode;
})(window.PolymerGestures);
(function() {
function shadowSelector(v) {
return 'html /deep/ ' + selector(v);
}
function selector(v) {
return '[touch-action="' + v + '"]';
}
function rule(v) {
return '{ -ms-touch-action: ' + v + '; touch-action: ' + v + ';}';
}
var attrib2css = [
'none',
'auto',
'pan-x',
'pan-y',
{
rule: 'pan-x pan-y',
selectors: [
'pan-x pan-y',
'pan-y pan-x'
]
},
'manipulation'
];
var styles = '';
// only install stylesheet if the browser has touch action support
var hasTouchAction = typeof document.head.style.touchAction === 'string';
// only add shadow selectors if shadowdom is supported
var hasShadowRoot = !window.ShadowDOMPolyfill && document.head.createShadowRoot;
if (hasTouchAction) {
attrib2css.forEach(function(r) {
if (String(r) === r) {
styles += selector(r) + rule(r) + '\n';
if (hasShadowRoot) {
styles += shadowSelector(r) + rule(r) + '\n';
}
} else {
styles += r.selectors.map(selector) + rule(r.rule) + '\n';
if (hasShadowRoot) {
styles += r.selectors.map(shadowSelector) + rule(r.rule) + '\n';
}
}
});
var el = document.createElement('style');
el.textContent = styles;
document.head.appendChild(el);
}
})();
/**
* This is the constructor for new PointerEvents.
*
* New Pointer Events must be given a type, and an optional dictionary of
* initialization properties.
*
* Due to certain platform requirements, events returned from the constructor
* identify as MouseEvents.
*
* @constructor
* @param {String} inType The type of the event to create.
* @param {Object} [inDict] An optional dictionary of initial event properties.
* @return {Event} A new PointerEvent of type `inType` and initialized with properties from `inDict`.
*/
(function(scope) {
var MOUSE_PROPS = [
'bubbles',
'cancelable',
'view',
'detail',
'screenX',
'screenY',
'clientX',
'clientY',
'ctrlKey',
'altKey',
'shiftKey',
'metaKey',
'button',
'relatedTarget',
'pageX',
'pageY'
];
var MOUSE_DEFAULTS = [
false,
false,
null,
null,
0,
0,
0,
0,
false,
false,
false,
false,
0,
null,
0,
0
];
var NOP_FACTORY = function(){ return function(){}; };
var eventFactory = {
// TODO(dfreedm): this is overridden by tap recognizer, needs review
preventTap: NOP_FACTORY,
makeBaseEvent: function(inType, inDict) {
var e = document.createEvent('Event');
e.initEvent(inType, inDict.bubbles || false, inDict.cancelable || false);
e.preventTap = eventFactory.preventTap(e);
return e;
},
makeGestureEvent: function(inType, inDict) {
inDict = inDict || Object.create(null);
var e = this.makeBaseEvent(inType, inDict);
for (var i = 0, keys = Object.keys(inDict), k; i < keys.length; i++) {
k = keys[i];
e[k] = inDict[k];
}
return e;
},
makePointerEvent: function(inType, inDict) {
inDict = inDict || Object.create(null);
var e = this.makeBaseEvent(inType, inDict);
// define inherited MouseEvent properties
for(var i = 0, p; i < MOUSE_PROPS.length; i++) {
p = MOUSE_PROPS[i];
e[p] = inDict[p] || MOUSE_DEFAULTS[i];
}
e.buttons = inDict.buttons || 0;
// Spec requires that pointers without pressure specified use 0.5 for down
// state and 0 for up state.
var pressure = 0;
if (inDict.pressure) {
pressure = inDict.pressure;
} else {
pressure = e.buttons ? 0.5 : 0;
}
// add x/y properties aliased to clientX/Y
e.x = e.clientX;
e.y = e.clientY;
// define the properties of the PointerEvent interface
e.pointerId = inDict.pointerId || 0;
e.width = inDict.width || 0;
e.height = inDict.height || 0;
e.pressure = pressure;
e.tiltX = inDict.tiltX || 0;
e.tiltY = inDict.tiltY || 0;
e.pointerType = inDict.pointerType || '';
e.hwTimestamp = inDict.hwTimestamp || 0;
e.isPrimary = inDict.isPrimary || false;
e._source = inDict._source || '';
return e;
}
};
scope.eventFactory = eventFactory;
})(window.PolymerGestures);
/**
* This module implements an map of pointer states
*/
(function(scope) {
var USE_MAP = window.Map && window.Map.prototype.forEach;
var POINTERS_FN = function(){ return this.size; };
function PointerMap() {
if (USE_MAP) {
var m = new Map();
m.pointers = POINTERS_FN;
return m;
} else {
this.keys = [];
this.values = [];
}
}
PointerMap.prototype = {
set: function(inId, inEvent) {
var i = this.keys.indexOf(inId);
if (i > -1) {
this.values[i] = inEvent;
} else {
this.keys.push(inId);
this.values.push(inEvent);
}
},
has: function(inId) {
return this.keys.indexOf(inId) > -1;
},
'delete': function(inId) {
var i = this.keys.indexOf(inId);
if (i > -1) {
this.keys.splice(i, 1);
this.values.splice(i, 1);
}
},
get: function(inId) {
var i = this.keys.indexOf(inId);
return this.values[i];
},
clear: function() {
this.keys.length = 0;
this.values.length = 0;
},
// return value, key, map
forEach: function(callback, thisArg) {
this.values.forEach(function(v, i) {
callback.call(thisArg, v, this.keys[i], this);
}, this);
},
pointers: function() {
return this.keys.length;
}
};
scope.PointerMap = PointerMap;
})(window.PolymerGestures);
(function(scope) {
var CLONE_PROPS = [
// MouseEvent
'bubbles',
'cancelable',
'view',
'detail',
'screenX',
'screenY',
'clientX',
'clientY',
'ctrlKey',
'altKey',
'shiftKey',
'metaKey',
'button',
'relatedTarget',
// DOM Level 3
'buttons',
// PointerEvent
'pointerId',
'width',
'height',
'pressure',
'tiltX',
'tiltY',
'pointerType',
'hwTimestamp',
'isPrimary',
// event instance
'type',
'target',
'currentTarget',
'which',
'pageX',
'pageY',
'timeStamp',
// gesture addons
'preventTap',
'tapPrevented',
'_source'
];
var CLONE_DEFAULTS = [
// MouseEvent
false,
false,
null,
null,
0,
0,
0,
0,
false,
false,
false,
false,
0,
null,
// DOM Level 3
0,
// PointerEvent
0,
0,
0,
0,
0,
0,
'',
0,
false,
// event instance
'',
null,
null,
0,
0,
0,
0,
function(){},
false
];
var HAS_SVG_INSTANCE = (typeof SVGElementInstance !== 'undefined');
var eventFactory = scope.eventFactory;
// set of recognizers to run for the currently handled event
var currentGestures;
/**
* This module is for normalizing events. Mouse and Touch events will be
* collected here, and fire PointerEvents that have the same semantics, no
* matter the source.
* Events fired:
* - pointerdown: a pointing is added
* - pointerup: a pointer is removed
* - pointermove: a pointer is moved
* - pointerover: a pointer crosses into an element
* - pointerout: a pointer leaves an element
* - pointercancel: a pointer will no longer generate events
*/
var dispatcher = {
IS_IOS: false,
pointermap: new scope.PointerMap(),
requiredGestures: new scope.PointerMap(),
eventMap: Object.create(null),
// Scope objects for native events.
// This exists for ease of testing.
eventSources: Object.create(null),
eventSourceList: [],
gestures: [],
// map gesture event -> {listeners: int, index: gestures[int]}
dependencyMap: {
// make sure down and up are in the map to trigger "register"
down: {listeners: 0, index: -1},
up: {listeners: 0, index: -1}
},
gestureQueue: [],
/**
* Add a new event source that will generate pointer events.
*
* `inSource` must contain an array of event names named `events`, and
* functions with the names specified in the `events` array.
* @param {string} name A name for the event source
* @param {Object} source A new source of platform events.
*/
registerSource: function(name, source) {
var s = source;
var newEvents = s.events;
if (newEvents) {
newEvents.forEach(function(e) {
if (s[e]) {
this.eventMap[e] = s[e].bind(s);
}
}, this);
this.eventSources[name] = s;
this.eventSourceList.push(s);
}
},
registerGesture: function(name, source) {
var obj = Object.create(null);
obj.listeners = 0;
obj.index = this.gestures.length;
for (var i = 0, g; i < source.exposes.length; i++) {
g = source.exposes[i].toLowerCase();
this.dependencyMap[g] = obj;
}
this.gestures.push(source);
},
register: function(element, initial) {
var l = this.eventSourceList.length;
for (var i = 0, es; (i < l) && (es = this.eventSourceList[i]); i++) {
// call eventsource register
es.register.call(es, element, initial);
}
},
unregister: function(element) {
var l = this.eventSourceList.length;
for (var i = 0, es; (i < l) && (es = this.eventSourceList[i]); i++) {
// call eventsource register
es.unregister.call(es, element);
}
},
// EVENTS
down: function(inEvent) {
this.requiredGestures.set(inEvent.pointerId, currentGestures);
this.fireEvent('down', inEvent);
},
move: function(inEvent) {
// pipe move events into gesture queue directly
inEvent.type = 'move';
this.fillGestureQueue(inEvent);
},
up: function(inEvent) {
this.fireEvent('up', inEvent);
this.requiredGestures.delete(inEvent.pointerId);
},
cancel: function(inEvent) {
inEvent.tapPrevented = true;
this.fireEvent('up', inEvent);
this.requiredGestures.delete(inEvent.pointerId);
},
addGestureDependency: function(node, currentGestures) {
var gesturesWanted = node._pgEvents;
if (gesturesWanted && currentGestures) {
var gk = Object.keys(gesturesWanted);
for (var i = 0, r, ri, g; i < gk.length; i++) {
// gesture
g = gk[i];
if (gesturesWanted[g] > 0) {
// lookup gesture recognizer
r = this.dependencyMap[g];
// recognizer index
ri = r ? r.index : -1;
currentGestures[ri] = true;
}
}
}
},
// LISTENER LOGIC
eventHandler: function(inEvent) {
// This is used to prevent multiple dispatch of events from
// platform events. This can happen when two elements in different scopes
// are set up to create pointer events, which is relevant to Shadow DOM.
var type = inEvent.type;
// only generate the list of desired events on "down"
if (type === 'touchstart' || type === 'mousedown' || type === 'pointerdown' || type === 'MSPointerDown') {
if (!inEvent._handledByPG) {
currentGestures = {};
}
// in IOS mode, there is only a listener on the document, so this is not re-entrant
if (this.IS_IOS) {
var ev = inEvent;
if (type === 'touchstart') {
var ct = inEvent.changedTouches[0];
// set up a fake event to give to the path builder
ev = {target: inEvent.target, clientX: ct.clientX, clientY: ct.clientY, path: inEvent.path};
}
// use event path if available, otherwise build a path from target finding
var nodes = inEvent.path || scope.targetFinding.path(ev);
for (var i = 0, n; i < nodes.length; i++) {
n = nodes[i];
this.addGestureDependency(n, currentGestures);
}
} else {
this.addGestureDependency(inEvent.currentTarget, currentGestures);
}
}
if (inEvent._handledByPG) {
return;
}
var fn = this.eventMap && this.eventMap[type];
if (fn) {
fn(inEvent);
}
inEvent._handledByPG = true;
},
// set up event listeners
listen: function(target, events) {
for (var i = 0, l = events.length, e; (i < l) && (e = events[i]); i++) {
this.addEvent(target, e);
}
},
// remove event listeners
unlisten: function(target, events) {
for (var i = 0, l = events.length, e; (i < l) && (e = events[i]); i++) {
this.removeEvent(target, e);
}
},
addEvent: function(target, eventName) {
target.addEventListener(eventName, this.boundHandler);
},
removeEvent: function(target, eventName) {
target.removeEventListener(eventName, this.boundHandler);
},
// EVENT CREATION AND TRACKING
/**
* Creates a new Event of type `inType`, based on the information in
* `inEvent`.
*
* @param {string} inType A string representing the type of event to create
* @param {Event} inEvent A platform event with a target
* @return {Event} A PointerEvent of type `inType`
*/
makeEvent: function(inType, inEvent) {
var e = eventFactory.makePointerEvent(inType, inEvent);
e.preventDefault = inEvent.preventDefault;
e.tapPrevented = inEvent.tapPrevented;
e._target = e._target || inEvent.target;
return e;
},
// make and dispatch an event in one call
fireEvent: function(inType, inEvent) {
var e = this.makeEvent(inType, inEvent);
return this.dispatchEvent(e);
},
/**
* Returns a snapshot of inEvent, with writable properties.
*
* @param {Event} inEvent An event that contains properties to copy.
* @return {Object} An object containing shallow copies of `inEvent`'s
* properties.
*/
cloneEvent: function(inEvent) {
var eventCopy = Object.create(null), p;
for (var i = 0; i < CLONE_PROPS.length; i++) {
p = CLONE_PROPS[i];
eventCopy[p] = inEvent[p] || CLONE_DEFAULTS[i];
// Work around SVGInstanceElement shadow tree
// Return the element that is represented by the instance for Safari, Chrome, IE.
// This is the behavior implemented by Firefox.
if (p === 'target' || p === 'relatedTarget') {
if (HAS_SVG_INSTANCE && eventCopy[p] instanceof SVGElementInstance) {
eventCopy[p] = eventCopy[p].correspondingUseElement;
}
}
}
// keep the semantics of preventDefault
eventCopy.preventDefault = function() {
inEvent.preventDefault();
};
return eventCopy;
},
/**
* Dispatches the event to its target.
*
* @param {Event} inEvent The event to be dispatched.
* @return {Boolean} True if an event handler returns true, false otherwise.
*/
dispatchEvent: function(inEvent) {
var t = inEvent._target;
if (t) {
t.dispatchEvent(inEvent);
// clone the event for the gesture system to process
// clone after dispatch to pick up gesture prevention code
var clone = this.cloneEvent(inEvent);
clone.target = t;
this.fillGestureQueue(clone);
}
},
gestureTrigger: function() {
// process the gesture queue
for (var i = 0, e, rg; i < this.gestureQueue.length; i++) {
e = this.gestureQueue[i];
rg = e._requiredGestures;
if (rg) {
for (var j = 0, g, fn; j < this.gestures.length; j++) {
// only run recognizer if an element in the source event's path is listening for those gestures
if (rg[j]) {
g = this.gestures[j];
fn = g[e.type];
if (fn) {
fn.call(g, e);
}
}
}
}
}
this.gestureQueue.length = 0;
},
fillGestureQueue: function(ev) {
// only trigger the gesture queue once
if (!this.gestureQueue.length) {
requestAnimationFrame(this.boundGestureTrigger);
}
ev._requiredGestures = this.requiredGestures.get(ev.pointerId);
this.gestureQueue.push(ev);
}
};
dispatcher.boundHandler = dispatcher.eventHandler.bind(dispatcher);
dispatcher.boundGestureTrigger = dispatcher.gestureTrigger.bind(dispatcher);
scope.dispatcher = dispatcher;
/**
* Listen for `gesture` on `node` with the `handler` function
*
* If `handler` is the first listener for `gesture`, the underlying gesture recognizer is then enabled.
*
* @param {Element} node
* @param {string} gesture
* @return Boolean `gesture` is a valid gesture
*/
scope.activateGesture = function(node, gesture) {
var g = gesture.toLowerCase();
var dep = dispatcher.dependencyMap[g];
if (dep) {
var recognizer = dispatcher.gestures[dep.index];
if (!node._pgListeners) {
dispatcher.register(node);
node._pgListeners = 0;
}
// TODO(dfreedm): re-evaluate bookkeeping to avoid using attributes
if (recognizer) {
var touchAction = recognizer.defaultActions && recognizer.defaultActions[g];
var actionNode;
switch(node.nodeType) {
case Node.ELEMENT_NODE:
actionNode = node;
break;
case Node.DOCUMENT_FRAGMENT_NODE:
actionNode = node.host;
break;
default:
actionNode = null;
break;
}
if (touchAction && actionNode && !actionNode.hasAttribute('touch-action')) {
actionNode.setAttribute('touch-action', touchAction);
}
}
if (!node._pgEvents) {
node._pgEvents = {};
}
node._pgEvents[g] = (node._pgEvents[g] || 0) + 1;
node._pgListeners++;
}
return Boolean(dep);
};
/**
*
* Listen for `gesture` from `node` with `handler` function.
*
* @param {Element} node
* @param {string} gesture
* @param {Function} handler
* @param {Boolean} capture
*/
scope.addEventListener = function(node, gesture, handler, capture) {
if (handler) {
scope.activateGesture(node, gesture);
node.addEventListener(gesture, handler, capture);
}
};
/**
* Tears down the gesture configuration for `node`
*
* If `handler` is the last listener for `gesture`, the underlying gesture recognizer is disabled.
*
* @param {Element} node
* @param {string} gesture
* @return Boolean `gesture` is a valid gesture
*/
scope.deactivateGesture = function(node, gesture) {
var g = gesture.toLowerCase();
var dep = dispatcher.dependencyMap[g];
if (dep) {
if (node._pgListeners > 0) {
node._pgListeners--;
}
if (node._pgListeners === 0) {
dispatcher.unregister(node);
}
if (node._pgEvents) {
if (node._pgEvents[g] > 0) {
node._pgEvents[g]--;
} else {
node._pgEvents[g] = 0;
}
}
}
return Boolean(dep);
};
/**
* Stop listening for `gesture` from `node` with `handler` function.
*
* @param {Element} node
* @param {string} gesture
* @param {Function} handler
* @param {Boolean} capture
*/
scope.removeEventListener = function(node, gesture, handler, capture) {
if (handler) {
scope.deactivateGesture(node, gesture);
node.removeEventListener(gesture, handler, capture);
}
};
})(window.PolymerGestures);
(function (scope) {
var dispatcher = scope.dispatcher;
var pointermap = dispatcher.pointermap;
// radius around touchend that swallows mouse events
var DEDUP_DIST = 25;
var WHICH_TO_BUTTONS = [0, 1, 4, 2];
var CURRENT_BUTTONS = 0;
var HAS_BUTTONS = false;
try {
HAS_BUTTONS = new MouseEvent('test', {buttons: 1}).buttons === 1;
} catch (e) {}
// handler block for native mouse events
var mouseEvents = {
POINTER_ID: 1,
POINTER_TYPE: 'mouse',
events: [
'mousedown',
'mousemove',
'mouseup'
],
exposes: [
'down',
'up',
'move'
],
register: function(target) {
dispatcher.listen(target, this.events);
},
unregister: function(target) {
if (target === document) {
return;
}
dispatcher.unlisten(target, this.events);
},
lastTouches: [],
// collide with the global mouse listener
isEventSimulatedFromTouch: function(inEvent) {
var lts = this.lastTouches;
var x = inEvent.clientX, y = inEvent.clientY;
for (var i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {
// simulated mouse events will be swallowed near a primary touchend
var dx = Math.abs(x - t.x), dy = Math.abs(y - t.y);
if (dx <= DEDUP_DIST && dy <= DEDUP_DIST) {
return true;
}
}
},
prepareEvent: function(inEvent) {
var e = dispatcher.cloneEvent(inEvent);
e.pointerId = this.POINTER_ID;
e.isPrimary = true;
e.pointerType = this.POINTER_TYPE;
e._source = 'mouse';
if (!HAS_BUTTONS) {
var type = inEvent.type;
var bit = WHICH_TO_BUTTONS[inEvent.which] || 0;
if (type === 'mousedown') {
CURRENT_BUTTONS |= bit;
} else if (type === 'mouseup') {
CURRENT_BUTTONS &= ~bit;
}
e.buttons = CURRENT_BUTTONS;
}
return e;
},
mousedown: function(inEvent) {
if (!this.isEventSimulatedFromTouch(inEvent)) {
var p = pointermap.has(this.POINTER_ID);
var e = this.prepareEvent(inEvent);
e.target = scope.findTarget(inEvent);
pointermap.set(this.POINTER_ID, e.target);
dispatcher.down(e);
}
},
mousemove: function(inEvent) {
if (!this.isEventSimulatedFromTouch(inEvent)) {
var target = pointermap.get(this.POINTER_ID);
if (target) {
var e = this.prepareEvent(inEvent);
e.target = target;
// handle case where we missed a mouseup
if ((HAS_BUTTONS ? e.buttons : e.which) === 0) {
if (!HAS_BUTTONS) {
CURRENT_BUTTONS = e.buttons = 0;
}
dispatcher.cancel(e);
this.cleanupMouse(e.buttons);
} else {
dispatcher.move(e);
}
}
}
},
mouseup: function(inEvent) {
if (!this.isEventSimulatedFromTouch(inEvent)) {
var e = this.prepareEvent(inEvent);
e.relatedTarget = scope.findTarget(inEvent);
e.target = pointermap.get(this.POINTER_ID);
dispatcher.up(e);
this.cleanupMouse(e.buttons);
}
},
cleanupMouse: function(buttons) {
if (buttons === 0) {
pointermap.delete(this.POINTER_ID);
}
}
};
scope.mouseEvents = mouseEvents;
})(window.PolymerGestures);
(function(scope) {
var dispatcher = scope.dispatcher;
var allShadows = scope.targetFinding.allShadows.bind(scope.targetFinding);
var pointermap = dispatcher.pointermap;
var touchMap = Array.prototype.map.call.bind(Array.prototype.map);
// This should be long enough to ignore compat mouse events made by touch
var DEDUP_TIMEOUT = 2500;
var DEDUP_DIST = 25;
var CLICK_COUNT_TIMEOUT = 200;
var HYSTERESIS = 20;
var ATTRIB = 'touch-action';
// TODO(dfreedm): disable until http://crbug.com/399765 is resolved
// var HAS_TOUCH_ACTION = ATTRIB in document.head.style;
var HAS_TOUCH_ACTION = false;
// handler block for native touch events
var touchEvents = {
IS_IOS: false,
events: [
'touchstart',
'touchmove',
'touchend',
'touchcancel'
],
exposes: [
'down',
'up',
'move'
],
register: function(target, initial) {
if (this.IS_IOS ? initial : !initial) {
dispatcher.listen(target, this.events);
}
},
unregister: function(target) {
if (!this.IS_IOS) {
dispatcher.unlisten(target, this.events);
}
},
scrollTypes: {
EMITTER: 'none',
XSCROLLER: 'pan-x',
YSCROLLER: 'pan-y',
},
touchActionToScrollType: function(touchAction) {
var t = touchAction;
var st = this.scrollTypes;
if (t === st.EMITTER) {
return 'none';
} else if (t === st.XSCROLLER) {
return 'X';
} else if (t === st.YSCROLLER) {
return 'Y';
} else {
return 'XY';
}
},
POINTER_TYPE: 'touch',
firstTouch: null,
isPrimaryTouch: function(inTouch) {
return this.firstTouch === inTouch.identifier;
},
setPrimaryTouch: function(inTouch) {
// set primary touch if there no pointers, or the only pointer is the mouse
if (pointermap.pointers() === 0 || (pointermap.pointers() === 1 && pointermap.has(1))) {
this.firstTouch = inTouch.identifier;
this.firstXY = {X: inTouch.clientX, Y: inTouch.clientY};
this.firstTarget = inTouch.target;
this.scrolling = null;
this.cancelResetClickCount();
}
},
removePrimaryPointer: function(inPointer) {
if (inPointer.isPrimary) {
this.firstTouch = null;
this.firstXY = null;
this.resetClickCount();
}
},
clickCount: 0,
resetId: null,
resetClickCount: function() {
var fn = function() {
this.clickCount = 0;
this.resetId = null;
}.bind(this);
this.resetId = setTimeout(fn, CLICK_COUNT_TIMEOUT);
},
cancelResetClickCount: function() {
if (this.resetId) {
clearTimeout(this.resetId);
}
},
typeToButtons: function(type) {
var ret = 0;
if (type === 'touchstart' || type === 'touchmove') {
ret = 1;
}
return ret;
},
findTarget: function(touch, id) {
if (this.currentTouchEvent.type === 'touchstart') {
if (this.isPrimaryTouch(touch)) {
var fastPath = {
clientX: touch.clientX,
clientY: touch.clientY,
path: this.currentTouchEvent.path,
target: this.currentTouchEvent.target
};
return scope.findTarget(fastPath);
} else {
return scope.findTarget(touch);
}
}
// reuse target we found in touchstart
return pointermap.get(id);
},
touchToPointer: function(inTouch) {
var cte = this.currentTouchEvent;
var e = dispatcher.cloneEvent(inTouch);
// Spec specifies that pointerId 1 is reserved for Mouse.
// Touch identifiers can start at 0.
// Add 2 to the touch identifier for compatibility.
var id = e.pointerId = inTouch.identifier + 2;
e.target = this.findTarget(inTouch, id);
e.bubbles = true;
e.cancelable = true;
e.detail = this.clickCount;
e.buttons = this.typeToButtons(cte.type);
e.width = inTouch.webkitRadiusX || inTouch.radiusX || 0;
e.height = inTouch.webkitRadiusY || inTouch.radiusY || 0;
e.pressure = inTouch.webkitForce || inTouch.force || 0.5;
e.isPrimary = this.isPrimaryTouch(inTouch);
e.pointerType = this.POINTER_TYPE;
e._source = 'touch';
// forward touch preventDefaults
var self = this;
e.preventDefault = function() {
self.scrolling = false;
self.firstXY = null;
cte.preventDefault();
};
return e;
},
processTouches: function(inEvent, inFunction) {
var tl = inEvent.changedTouches;
this.currentTouchEvent = inEvent;
for (var i = 0, t, p; i < tl.length; i++) {
t = tl[i];
p = this.touchToPointer(t);
if (inEvent.type === 'touchstart') {
pointermap.set(p.pointerId, p.target);
}
if (pointermap.has(p.pointerId)) {
inFunction.call(this, p);
}
if (inEvent.type === 'touchend' || inEvent._cancel) {
this.cleanUpPointer(p);
}
}
},
// For single axis scrollers, determines whether the element should emit
// pointer events or behave as a scroller
shouldScroll: function(inEvent) {
if (this.firstXY) {
var ret;
var touchAction = scope.targetFinding.findTouchAction(inEvent);
var scrollAxis = this.touchActionToScrollType(touchAction);
if (scrollAxis === 'none') {
// this element is a touch-action: none, should never scroll
ret = false;
} else if (scrollAxis === 'XY') {
// this element should always scroll
ret = true;
} else {
var t = inEvent.changedTouches[0];
// check the intended scroll axis, and other axis
var a = scrollAxis;
var oa = scrollAxis === 'Y' ? 'X' : 'Y';
var da = Math.abs(t['client' + a] - this.firstXY[a]);
var doa = Math.abs(t['client' + oa] - this.firstXY[oa]);
// if delta in the scroll axis > delta other axis, scroll instead of
// making events
ret = da >= doa;
}
return ret;
}
},
findTouch: function(inTL, inId) {
for (var i = 0, l = inTL.length, t; i < l && (t = inTL[i]); i++) {
if (t.identifier === inId) {
return true;
}
}
},
// In some instances, a touchstart can happen without a touchend. This
// leaves the pointermap in a broken state.
// Therefore, on every touchstart, we remove the touches that did not fire a
// touchend event.
// To keep state globally consistent, we fire a
// pointercancel for this "abandoned" touch
vacuumTouches: function(inEvent) {
var tl = inEvent.touches;
// pointermap.pointers() should be < tl.length here, as the touchstart has not
// been processed yet.
if (pointermap.pointers() >= tl.length) {
var d = [];
pointermap.forEach(function(value, key) {
// Never remove pointerId == 1, which is mouse.
// Touch identifiers are 2 smaller than their pointerId, which is the
// index in pointermap.
if (key !== 1 && !this.findTouch(tl, key - 2)) {
var p = value;
d.push(p);
}
}, this);
d.forEach(function(p) {
this.cancel(p);
pointermap.delete(p.pointerId);
});
}
},
touchstart: function(inEvent) {
this.vacuumTouches(inEvent);
this.setPrimaryTouch(inEvent.changedTouches[0]);
this.dedupSynthMouse(inEvent);
if (!this.scrolling) {
this.clickCount++;
this.processTouches(inEvent, this.down);
}
},
down: function(inPointer) {
dispatcher.down(inPointer);
},
touchmove: function(inEvent) {
if (HAS_TOUCH_ACTION) {
// touchevent.cancelable == false is sent when the page is scrolling under native Touch Action in Chrome 36
// https://groups.google.com/a/chromium.org/d/msg/input-dev/wHnyukcYBcA/b9kmtwM1jJQJ
if (inEvent.cancelable) {
this.processTouches(inEvent, this.move);
}
} else {
if (!this.scrolling) {
if (this.scrolling === null && this.shouldScroll(inEvent)) {
this.scrolling = true;
} else {
this.scrolling = false;
inEvent.preventDefault();
this.processTouches(inEvent, this.move);
}
} else if (this.firstXY) {
var t = inEvent.changedTouches[0];
var dx = t.clientX - this.firstXY.X;
var dy = t.clientY - this.firstXY.Y;
var dd = Math.sqrt(dx * dx + dy * dy);
if (dd >= HYSTERESIS) {
this.touchcancel(inEvent);
this.scrolling = true;
this.firstXY = null;
}
}
}
},
move: function(inPointer) {
dispatcher.move(inPointer);
},
touchend: function(inEvent) {
this.dedupSynthMouse(inEvent);
this.processTouches(inEvent, this.up);
},
up: function(inPointer) {
inPointer.relatedTarget = scope.findTarget(inPointer);
dispatcher.up(inPointer);
},
cancel: function(inPointer) {
dispatcher.cancel(inPointer);
},
touchcancel: function(inEvent) {
inEvent._cancel = true;
this.processTouches(inEvent, this.cancel);
},
cleanUpPointer: function(inPointer) {
pointermap['delete'](inPointer.pointerId);
this.removePrimaryPointer(inPointer);
},
// prevent synth mouse events from creating pointer events
dedupSynthMouse: function(inEvent) {
var lts = scope.mouseEvents.lastTouches;
var t = inEvent.changedTouches[0];
// only the primary finger will synth mouse events
if (this.isPrimaryTouch(t)) {
// remember x/y of last touch
var lt = {x: t.clientX, y: t.clientY};
lts.push(lt);
var fn = (function(lts, lt){
var i = lts.indexOf(lt);
if (i > -1) {
lts.splice(i, 1);
}
}).bind(null, lts, lt);
setTimeout(fn, DEDUP_TIMEOUT);
}
}
};
// prevent "ghost clicks" that come from elements that were removed in a touch handler
var STOP_PROP_FN = Event.prototype.stopImmediatePropagation || Event.prototype.stopPropagation;
document.addEventListener('click', function(ev) {
var x = ev.clientX, y = ev.clientY;
// check if a click is within DEDUP_DIST px radius of the touchstart
var closeTo = function(touch) {
var dx = Math.abs(x - touch.x), dy = Math.abs(y - touch.y);
return (dx <= DEDUP_DIST && dy <= DEDUP_DIST);
};
// if click coordinates are close to touch coordinates, assume the click came from a touch
var wasTouched = scope.mouseEvents.lastTouches.some(closeTo);
// if the click came from touch, and the touchstart target is not in the path of the click event,
// then the touchstart target was probably removed, and the click should be "busted"
var path = scope.targetFinding.path(ev);
if (wasTouched) {
for (var i = 0; i < path.length; i++) {
if (path[i] === touchEvents.firstTarget) {
return;
}
}
ev.preventDefault();
STOP_PROP_FN.call(ev);
}
}, true);
scope.touchEvents = touchEvents;
})(window.PolymerGestures);
(function(scope) {
var dispatcher = scope.dispatcher;
var pointermap = dispatcher.pointermap;
var HAS_BITMAP_TYPE = window.MSPointerEvent && typeof window.MSPointerEvent.MSPOINTER_TYPE_MOUSE === 'number';
var msEvents = {
events: [
'MSPointerDown',
'MSPointerMove',
'MSPointerUp',
'MSPointerCancel',
],
register: function(target) {
dispatcher.listen(target, this.events);
},
unregister: function(target) {
if (target === document) {
return;
}
dispatcher.unlisten(target, this.events);
},
POINTER_TYPES: [
'',
'unavailable',
'touch',
'pen',
'mouse'
],
prepareEvent: function(inEvent) {
var e = inEvent;
e = dispatcher.cloneEvent(inEvent);
if (HAS_BITMAP_TYPE) {
e.pointerType = this.POINTER_TYPES[inEvent.pointerType];
}
e._source = 'ms';
return e;
},
cleanup: function(id) {
pointermap['delete'](id);
},
MSPointerDown: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.target = scope.findTarget(inEvent);
pointermap.set(inEvent.pointerId, e.target);
dispatcher.down(e);
},
MSPointerMove: function(inEvent) {
var target = pointermap.get(inEvent.pointerId);
if (target) {
var e = this.prepareEvent(inEvent);
e.target = target;
dispatcher.move(e);
}
},
MSPointerUp: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.relatedTarget = scope.findTarget(inEvent);
e.target = pointermap.get(e.pointerId);
dispatcher.up(e);
this.cleanup(inEvent.pointerId);
},
MSPointerCancel: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.relatedTarget = scope.findTarget(inEvent);
e.target = pointermap.get(e.pointerId);
dispatcher.cancel(e);
this.cleanup(inEvent.pointerId);
}
};
scope.msEvents = msEvents;
})(window.PolymerGestures);
(function(scope) {
var dispatcher = scope.dispatcher;
var pointermap = dispatcher.pointermap;
var pointerEvents = {
events: [
'pointerdown',
'pointermove',
'pointerup',
'pointercancel'
],
prepareEvent: function(inEvent) {
var e = dispatcher.cloneEvent(inEvent);
e._source = 'pointer';
return e;
},
register: function(target) {
dispatcher.listen(target, this.events);
},
unregister: function(target) {
if (target === document) {
return;
}
dispatcher.unlisten(target, this.events);
},
cleanup: function(id) {
pointermap['delete'](id);
},
pointerdown: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.target = scope.findTarget(inEvent);
pointermap.set(e.pointerId, e.target);
dispatcher.down(e);
},
pointermove: function(inEvent) {
var target = pointermap.get(inEvent.pointerId);
if (target) {
var e = this.prepareEvent(inEvent);
e.target = target;
dispatcher.move(e);
}
},
pointerup: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.relatedTarget = scope.findTarget(inEvent);
e.target = pointermap.get(e.pointerId);
dispatcher.up(e);
this.cleanup(inEvent.pointerId);
},
pointercancel: function(inEvent) {
var e = this.prepareEvent(inEvent);
e.relatedTarget = scope.findTarget(inEvent);
e.target = pointermap.get(e.pointerId);
dispatcher.cancel(e);
this.cleanup(inEvent.pointerId);
}
};
scope.pointerEvents = pointerEvents;
})(window.PolymerGestures);
/**
* This module contains the handlers for native platform events.
* From here, the dispatcher is called to create unified pointer events.
* Included are touch events (v1), mouse events, and MSPointerEvents.
*/
(function(scope) {
var dispatcher = scope.dispatcher;
var nav = window.navigator;
if (window.PointerEvent) {
dispatcher.registerSource('pointer', scope.pointerEvents);
} else if (nav.msPointerEnabled) {
dispatcher.registerSource('ms', scope.msEvents);
} else {
dispatcher.registerSource('mouse', scope.mouseEvents);
if (window.ontouchstart !== undefined) {
dispatcher.registerSource('touch', scope.touchEvents);
}
}
// Work around iOS bugs https://bugs.webkit.org/show_bug.cgi?id=135628 and https://bugs.webkit.org/show_bug.cgi?id=136506
var ua = navigator.userAgent;
var IS_IOS = ua.match(/iPad|iPhone|iPod/) && 'ontouchstart' in window;
dispatcher.IS_IOS = IS_IOS;
scope.touchEvents.IS_IOS = IS_IOS;
dispatcher.register(document, true);
})(window.PolymerGestures);
/**
* This event denotes the beginning of a series of tracking events.
*
* @module PointerGestures
* @submodule Events
* @class trackstart
*/
/**
* Pixels moved in the x direction since trackstart.
* @type Number
* @property dx
*/
/**
* Pixes moved in the y direction since trackstart.
* @type Number
* @property dy
*/
/**
* Pixels moved in the x direction since the last track.
* @type Number
* @property ddx
*/
/**
* Pixles moved in the y direction since the last track.
* @type Number
* @property ddy
*/
/**
* The clientX position of the track gesture.
* @type Number
* @property clientX
*/
/**
* The clientY position of the track gesture.
* @type Number
* @property clientY
*/
/**
* The pageX position of the track gesture.
* @type Number
* @property pageX
*/
/**
* The pageY position of the track gesture.
* @type Number
* @property pageY
*/
/**
* The screenX position of the track gesture.
* @type Number
* @property screenX
*/
/**
* The screenY position of the track gesture.
* @type Number
* @property screenY
*/
/**
* The last x axis direction of the pointer.
* @type Number
* @property xDirection
*/
/**
* The last y axis direction of the pointer.
* @type Number
* @property yDirection
*/
/**
* A shared object between all tracking events.
* @type Object
* @property trackInfo
*/
/**
* The element currently under the pointer.
* @type Element
* @property relatedTarget
*/
/**
* The type of pointer that make the track gesture.
* @type String
* @property pointerType
*/
/**
*
* This event fires for all pointer movement being tracked.
*
* @class track
* @extends trackstart
*/
/**
* This event fires when the pointer is no longer being tracked.
*
* @class trackend
* @extends trackstart
*/
(function(scope) {
var dispatcher = scope.dispatcher;
var eventFactory = scope.eventFactory;
var pointermap = new scope.PointerMap();
var track = {
events: [
'down',
'move',
'up',
],
exposes: [
'trackstart',
'track',
'trackx',
'tracky',
'trackend'
],
defaultActions: {
'track': 'none',
'trackx': 'pan-y',
'tracky': 'pan-x'
},
WIGGLE_THRESHOLD: 4,
clampDir: function(inDelta) {
return inDelta > 0 ? 1 : -1;
},
calcPositionDelta: function(inA, inB) {
var x = 0, y = 0;
if (inA && inB) {
x = inB.pageX - inA.pageX;
y = inB.pageY - inA.pageY;
}
return {x: x, y: y};
},
fireTrack: function(inType, inEvent, inTrackingData) {
var t = inTrackingData;
var d = this.calcPositionDelta(t.downEvent, inEvent);
var dd = this.calcPositionDelta(t.lastMoveEvent, inEvent);
if (dd.x) {
t.xDirection = this.clampDir(dd.x);
} else if (inType === 'trackx') {
return;
}
if (dd.y) {
t.yDirection = this.clampDir(dd.y);
} else if (inType === 'tracky') {
return;
}
var gestureProto = {
bubbles: true,
cancelable: true,
trackInfo: t.trackInfo,
relatedTarget: inEvent.relatedTarget,
pointerType: inEvent.pointerType,
pointerId: inEvent.pointerId,
_source: 'track'
};
if (inType !== 'tracky') {
gestureProto.x = inEvent.x;
gestureProto.dx = d.x;
gestureProto.ddx = dd.x;
gestureProto.clientX = inEvent.clientX;
gestureProto.pageX = inEvent.pageX;
gestureProto.screenX = inEvent.screenX;
gestureProto.xDirection = t.xDirection;
}
if (inType !== 'trackx') {
gestureProto.dy = d.y;
gestureProto.ddy = dd.y;
gestureProto.y = inEvent.y;
gestureProto.clientY = inEvent.clientY;
gestureProto.pageY = inEvent.pageY;
gestureProto.screenY = inEvent.screenY;
gestureProto.yDirection = t.yDirection;
}
var e = eventFactory.makeGestureEvent(inType, gestureProto);
t.downTarget.dispatchEvent(e);
},
down: function(inEvent) {
if (inEvent.isPrimary && (inEvent.pointerType === 'mouse' ? inEvent.buttons === 1 : true)) {
var p = {
downEvent: inEvent,
downTarget: inEvent.target,
trackInfo: {},
lastMoveEvent: null,
xDirection: 0,
yDirection: 0,
tracking: false
};
pointermap.set(inEvent.pointerId, p);
}
},
move: function(inEvent) {
var p = pointermap.get(inEvent.pointerId);
if (p) {
if (!p.tracking) {
var d = this.calcPositionDelta(p.downEvent, inEvent);
var move = d.x * d.x + d.y * d.y;
// start tracking only if finger moves more than WIGGLE_THRESHOLD
if (move > this.WIGGLE_THRESHOLD) {
p.tracking = true;
p.lastMoveEvent = p.downEvent;
this.fireTrack('trackstart', inEvent, p);
}
}
if (p.tracking) {
this.fireTrack('track', inEvent, p);
this.fireTrack('trackx', inEvent, p);
this.fireTrack('tracky', inEvent, p);
}
p.lastMoveEvent = inEvent;
}
},
up: function(inEvent) {
var p = pointermap.get(inEvent.pointerId);
if (p) {
if (p.tracking) {
this.fireTrack('trackend', inEvent, p);
}
pointermap.delete(inEvent.pointerId);
}
}
};
dispatcher.registerGesture('track', track);
})(window.PolymerGestures);
/**
* This event is fired when a pointer is held down for 200ms.
*
* @module PointerGestures
* @submodule Events
* @class hold
*/
/**
* Type of pointer that made the holding event.
* @type String
* @property pointerType
*/
/**
* Screen X axis position of the held pointer
* @type Number
* @property clientX
*/
/**
* Screen Y axis position of the held pointer
* @type Number
* @property clientY
*/
/**
* Type of pointer that made the holding event.
* @type String
* @property pointerType
*/
/**
* This event is fired every 200ms while a pointer is held down.
*
* @class holdpulse
* @extends hold
*/
/**
* Milliseconds pointer has been held down.
* @type Number
* @property holdTime
*/
/**
* This event is fired when a held pointer is released or moved.
*
* @class release
*/
(function(scope) {
var dispatcher = scope.dispatcher;
var eventFactory = scope.eventFactory;
var hold = {
// wait at least HOLD_DELAY ms between hold and pulse events
HOLD_DELAY: 200,
// pointer can move WIGGLE_THRESHOLD pixels before not counting as a hold
WIGGLE_THRESHOLD: 16,
events: [
'down',
'move',
'up',
],
exposes: [
'hold',
'holdpulse',
'release'
],
heldPointer: null,
holdJob: null,
pulse: function() {
var hold = Date.now() - this.heldPointer.timeStamp;
var type = this.held ? 'holdpulse' : 'hold';
this.fireHold(type, hold);
this.held = true;
},
cancel: function() {
clearInterval(this.holdJob);
if (this.held) {
this.fireHold('release');
}
this.held = false;
this.heldPointer = null;
this.target = null;
this.holdJob = null;
},
down: function(inEvent) {
if (inEvent.isPrimary && !this.heldPointer) {
this.heldPointer = inEvent;
this.target = inEvent.target;
this.holdJob = setInterval(this.pulse.bind(this), this.HOLD_DELAY);
}
},
up: function(inEvent) {
if (this.heldPointer && this.heldPointer.pointerId === inEvent.pointerId) {
this.cancel();
}
},
move: function(inEvent) {
if (this.heldPointer && this.heldPointer.pointerId === inEvent.pointerId) {
var x = inEvent.clientX - this.heldPointer.clientX;
var y = inEvent.clientY - this.heldPointer.clientY;
if ((x * x + y * y) > this.WIGGLE_THRESHOLD) {
this.cancel();
}
}
},
fireHold: function(inType, inHoldTime) {
var p = {
bubbles: true,
cancelable: true,
pointerType: this.heldPointer.pointerType,
pointerId: this.heldPointer.pointerId,
x: this.heldPointer.clientX,
y: this.heldPointer.clientY,
_source: 'hold'
};
if (inHoldTime) {
p.holdTime = inHoldTime;
}
var e = eventFactory.makeGestureEvent(inType, p);
this.target.dispatchEvent(e);
}
};
dispatcher.registerGesture('hold', hold);
})(window.PolymerGestures);
/**
* This event is fired when a pointer quickly goes down and up, and is used to
* denote activation.
*
* Any gesture event can prevent the tap event from being created by calling
* `event.preventTap`.
*
* Any pointer event can prevent the tap by setting the `tapPrevented` property
* on itself.
*
* @module PointerGestures
* @submodule Events
* @class tap
*/
/**
* X axis position of the tap.
* @property x
* @type Number
*/
/**
* Y axis position of the tap.
* @property y
* @type Number
*/
/**
* Type of the pointer that made the tap.
* @property pointerType
* @type String
*/
(function(scope) {
var dispatcher = scope.dispatcher;
var eventFactory = scope.eventFactory;
var pointermap = new scope.PointerMap();
var tap = {
events: [
'down',
'up'
],
exposes: [
'tap'
],
down: function(inEvent) {
if (inEvent.isPrimary && !inEvent.tapPrevented) {
pointermap.set(inEvent.pointerId, {
target: inEvent.target,
buttons: inEvent.buttons,
x: inEvent.clientX,
y: inEvent.clientY
});
}
},
shouldTap: function(e, downState) {
var tap = true;
if (e.pointerType === 'mouse') {
// only allow left click to tap for mouse
tap = (e.buttons ^ 1) && (downState.buttons & 1);
}
return tap && !e.tapPrevented;
},
up: function(inEvent) {
var start = pointermap.get(inEvent.pointerId);
if (start && this.shouldTap(inEvent, start)) {
// up.relatedTarget is target currently under finger
var t = scope.targetFinding.LCA(start.target, inEvent.relatedTarget);
if (t) {
var e = eventFactory.makeGestureEvent('tap', {
bubbles: true,
cancelable: true,
x: inEvent.clientX,
y: inEvent.clientY,
detail: inEvent.detail,
pointerType: inEvent.pointerType,
pointerId: inEvent.pointerId,
altKey: inEvent.altKey,
ctrlKey: inEvent.ctrlKey,
metaKey: inEvent.metaKey,
shiftKey: inEvent.shiftKey,
_source: 'tap'
});
t.dispatchEvent(e);
}
}
pointermap.delete(inEvent.pointerId);
}
};
// patch eventFactory to remove id from tap's pointermap for preventTap calls
eventFactory.preventTap = function(e) {
return function() {
e.tapPrevented = true;
pointermap.delete(e.pointerId);
};
};
dispatcher.registerGesture('tap', tap);
})(window.PolymerGestures);
/*
* Basic strategy: find the farthest apart points, use as diameter of circle
* react to size change and rotation of the chord
*/
/**
* @module pointer-gestures
* @submodule Events
* @class pinch
*/
/**
* Scale of the pinch zoom gesture
* @property scale
* @type Number
*/
/**
* Center X position of pointers causing pinch
* @property centerX
* @type Number
*/
/**
* Center Y position of pointers causing pinch
* @property centerY
* @type Number
*/
/**
* @module pointer-gestures
* @submodule Events
* @class rotate
*/
/**
* Angle (in degrees) of rotation. Measured from starting positions of pointers.
* @property angle
* @type Number
*/
/**
* Center X position of pointers causing rotation
* @property centerX
* @type Number
*/
/**
* Center Y position of pointers causing rotation
* @property centerY
* @type Number
*/
(function(scope) {
var dispatcher = scope.dispatcher;
var eventFactory = scope.eventFactory;
var pointermap = new scope.PointerMap();
var RAD_TO_DEG = 180 / Math.PI;
var pinch = {
events: [
'down',
'up',
'move',
'cancel'
],
exposes: [
'pinch',
'rotate'
],
defaultActions: {
'pinch': 'none',
'rotate': 'none'
},
reference: {},
down: function(inEvent) {
pointermap.set(inEvent.pointerId, inEvent);
if (pointermap.pointers() == 2) {
var points = this.calcChord();
var angle = this.calcAngle(points);
this.reference = {
angle: angle,
diameter: points.diameter,
target: scope.targetFinding.LCA(points.a.target, points.b.target)
};
}
},
up: function(inEvent) {
var p = pointermap.get(inEvent.pointerId);
if (p) {
pointermap.delete(inEvent.pointerId);
}
},
move: function(inEvent) {
if (pointermap.has(inEvent.pointerId)) {
pointermap.set(inEvent.pointerId, inEvent);
if (pointermap.pointers() > 1) {
this.calcPinchRotate();
}
}
},
cancel: function(inEvent) {
this.up(inEvent);
},
firePinch: function(diameter, points) {
var zoom = diameter / this.reference.diameter;
var e = eventFactory.makeGestureEvent('pinch', {
bubbles: true,
cancelable: true,
scale: zoom,
centerX: points.center.x,
centerY: points.center.y,
_source: 'pinch'
});
this.reference.target.dispatchEvent(e);
},
fireRotate: function(angle, points) {
var diff = Math.round((angle - this.reference.angle) % 360);
var e = eventFactory.makeGestureEvent('rotate', {
bubbles: true,
cancelable: true,
angle: diff,
centerX: points.center.x,
centerY: points.center.y,
_source: 'pinch'
});
this.reference.target.dispatchEvent(e);
},
calcPinchRotate: function() {
var points = this.calcChord();
var diameter = points.diameter;
var angle = this.calcAngle(points);
if (diameter != this.reference.diameter) {
this.firePinch(diameter, points);
}
if (angle != this.reference.angle) {
this.fireRotate(angle, points);
}
},
calcChord: function() {
var pointers = [];
pointermap.forEach(function(p) {
pointers.push(p);
});
var dist = 0;
// start with at least two pointers
var points = {a: pointers[0], b: pointers[1]};
var x, y, d;
for (var i = 0; i < pointers.length; i++) {
var a = pointers[i];
for (var j = i + 1; j < pointers.length; j++) {
var b = pointers[j];
x = Math.abs(a.clientX - b.clientX);
y = Math.abs(a.clientY - b.clientY);
d = x + y;
if (d > dist) {
dist = d;
points = {a: a, b: b};
}
}
}
x = Math.abs(points.a.clientX + points.b.clientX) / 2;
y = Math.abs(points.a.clientY + points.b.clientY) / 2;
points.center = { x: x, y: y };
points.diameter = dist;
return points;
},
calcAngle: function(points) {
var x = points.a.clientX - points.b.clientX;
var y = points.a.clientY - points.b.clientY;
return (360 + Math.atan2(y, x) * RAD_TO_DEG) % 360;
}
};
dispatcher.registerGesture('pinch', pinch);
})(window.PolymerGestures);
(function (global) {
'use strict';
var Token,
TokenName,
Syntax,
Messages,
source,
index,
length,
delegate,
lookahead,
state;
Token = {
BooleanLiteral: 1,
EOF: 2,
Identifier: 3,
Keyword: 4,
NullLiteral: 5,
NumericLiteral: 6,
Punctuator: 7,
StringLiteral: 8
};
TokenName = {};
TokenName[Token.BooleanLiteral] = 'Boolean';
TokenName[Token.EOF] = '';
TokenName[Token.Identifier] = 'Identifier';
TokenName[Token.Keyword] = 'Keyword';
TokenName[Token.NullLiteral] = 'Null';
TokenName[Token.NumericLiteral] = 'Numeric';
TokenName[Token.Punctuator] = 'Punctuator';
TokenName[Token.StringLiteral] = 'String';
Syntax = {
ArrayExpression: 'ArrayExpression',
BinaryExpression: 'BinaryExpression',
CallExpression: 'CallExpression',
ConditionalExpression: 'ConditionalExpression',
EmptyStatement: 'EmptyStatement',
ExpressionStatement: 'ExpressionStatement',
Identifier: 'Identifier',
Literal: 'Literal',
LabeledStatement: 'LabeledStatement',
LogicalExpression: 'LogicalExpression',
MemberExpression: 'MemberExpression',
ObjectExpression: 'ObjectExpression',
Program: 'Program',
Property: 'Property',
ThisExpression: 'ThisExpression',
UnaryExpression: 'UnaryExpression'
};
// Error messages should be identical to V8.
Messages = {
UnexpectedToken: 'Unexpected token %0',
UnknownLabel: 'Undefined label \'%0\'',
Redeclaration: '%0 \'%1\' has already been declared'
};
// Ensure the condition is true, otherwise throw an error.
// This is only to have a better contract semantic, i.e. another safety net
// to catch a logic error. The condition shall be fulfilled in normal case.
// Do NOT use this to enforce a certain condition on any user input.
function assert(condition, message) {
if (!condition) {
throw new Error('ASSERT: ' + message);
}
}
function isDecimalDigit(ch) {
return (ch >= 48 && ch <= 57); // 0..9
}
// 7.2 White Space
function isWhiteSpace(ch) {
return (ch === 32) || // space
(ch === 9) || // tab
(ch === 0xB) ||
(ch === 0xC) ||
(ch === 0xA0) ||
(ch >= 0x1680 && '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(String.fromCharCode(ch)) > 0);
}
// 7.3 Line Terminators
function isLineTerminator(ch) {
return (ch === 10) || (ch === 13) || (ch === 0x2028) || (ch === 0x2029);
}
// 7.6 Identifier Names and Identifiers
function isIdentifierStart(ch) {
return (ch === 36) || (ch === 95) || // $ (dollar) and _ (underscore)
(ch >= 65 && ch <= 90) || // A..Z
(ch >= 97 && ch <= 122); // a..z
}
function isIdentifierPart(ch) {
return (ch === 36) || (ch === 95) || // $ (dollar) and _ (underscore)
(ch >= 65 && ch <= 90) || // A..Z
(ch >= 97 && ch <= 122) || // a..z
(ch >= 48 && ch <= 57); // 0..9
}
// 7.6.1.1 Keywords
function isKeyword(id) {
return (id === 'this')
}
// 7.4 Comments
function skipWhitespace() {
while (index < length && isWhiteSpace(source.charCodeAt(index))) {
++index;
}
}
function getIdentifier() {
var start, ch;
start = index++;
while (index < length) {
ch = source.charCodeAt(index);
if (isIdentifierPart(ch)) {
++index;
} else {
break;
}
}
return source.slice(start, index);
}
function scanIdentifier() {
var start, id, type;
start = index;
id = getIdentifier();
// There is no keyword or literal with only one character.
// Thus, it must be an identifier.
if (id.length === 1) {
type = Token.Identifier;
} else if (isKeyword(id)) {
type = Token.Keyword;
} else if (id === 'null') {
type = Token.NullLiteral;
} else if (id === 'true' || id === 'false') {
type = Token.BooleanLiteral;
} else {
type = Token.Identifier;
}
return {
type: type,
value: id,
range: [start, index]
};
}
// 7.7 Punctuators
function scanPunctuator() {
var start = index,
code = source.charCodeAt(index),
code2,
ch1 = source[index],
ch2;
switch (code) {
// Check for most common single-character punctuators.
case 46: // . dot
case 40: // ( open bracket
case 41: // ) close bracket
case 59: // ; semicolon
case 44: // , comma
case 123: // { open curly brace
case 125: // } close curly brace
case 91: // [
case 93: // ]
case 58: // :
case 63: // ?
++index;
return {
type: Token.Punctuator,
value: String.fromCharCode(code),
range: [start, index]
};
default:
code2 = source.charCodeAt(index + 1);
// '=' (char #61) marks an assignment or comparison operator.
if (code2 === 61) {
switch (code) {
case 37: // %
case 38: // &
case 42: // *:
case 43: // +
case 45: // -
case 47: // /
case 60: // <
case 62: // >
case 124: // |
index += 2;
return {
type: Token.Punctuator,
value: String.fromCharCode(code) + String.fromCharCode(code2),
range: [start, index]
};
case 33: // !
case 61: // =
index += 2;
// !== and ===
if (source.charCodeAt(index) === 61) {
++index;
}
return {
type: Token.Punctuator,
value: source.slice(start, index),
range: [start, index]
};
default:
break;
}
}
break;
}
// Peek more characters.
ch2 = source[index + 1];
// Other 2-character punctuators: && ||
if (ch1 === ch2 && ('&|'.indexOf(ch1) >= 0)) {
index += 2;
return {
type: Token.Punctuator,
value: ch1 + ch2,
range: [start, index]
};
}
if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
++index;
return {
type: Token.Punctuator,
value: ch1,
range: [start, index]
};
}
throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
}
// 7.8.3 Numeric Literals
function scanNumericLiteral() {
var number, start, ch;
ch = source[index];
assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
'Numeric literal must start with a decimal digit or a decimal point');
start = index;
number = '';
if (ch !== '.') {
number = source[index++];
ch = source[index];
// Hex number starts with '0x'.
// Octal number starts with '0'.
if (number === '0') {
// decimal number starts with '0' such as '09' is illegal.
if (ch && isDecimalDigit(ch.charCodeAt(0))) {
throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
}
}
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
ch = source[index];
}
if (ch === '.') {
number += source[index++];
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
ch = source[index];
}
if (ch === 'e' || ch === 'E') {
number += source[index++];
ch = source[index];
if (ch === '+' || ch === '-') {
number += source[index++];
}
if (isDecimalDigit(source.charCodeAt(index))) {
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
} else {
throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
}
}
if (isIdentifierStart(source.charCodeAt(index))) {
throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
}
return {
type: Token.NumericLiteral,
value: parseFloat(number),
range: [start, index]
};
}
// 7.8.4 String Literals
function scanStringLiteral() {
var str = '', quote, start, ch, octal = false;
quote = source[index];
assert((quote === '\'' || quote === '"'),
'String literal must starts with a quote');
start = index;
++index;
while (index < length) {
ch = source[index++];
if (ch === quote) {
quote = '';
break;
} else if (ch === '\\') {
ch = source[index++];
if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
switch (ch) {
case 'n':
str += '\n';
break;
case 'r':
str += '\r';
break;
case 't':
str += '\t';
break;
case 'b':
str += '\b';
break;
case 'f':
str += '\f';
break;
case 'v':
str += '\x0B';
break;
default:
str += ch;
break;
}
} else {
if (ch === '\r' && source[index] === '\n') {
++index;
}
}
} else if (isLineTerminator(ch.charCodeAt(0))) {
break;
} else {
str += ch;
}
}
if (quote !== '') {
throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
}
return {
type: Token.StringLiteral,
value: str,
octal: octal,
range: [start, index]
};
}
function isIdentifierName(token) {
return token.type === Token.Identifier ||
token.type === Token.Keyword ||
token.type === Token.BooleanLiteral ||
token.type === Token.NullLiteral;
}
function advance() {
var ch;
skipWhitespace();
if (index >= length) {
return {
type: Token.EOF,
range: [index, index]
};
}
ch = source.charCodeAt(index);
// Very common: ( and ) and ;
if (ch === 40 || ch === 41 || ch === 58) {
return scanPunctuator();
}
// String literal starts with single quote (#39) or double quote (#34).
if (ch === 39 || ch === 34) {
return scanStringLiteral();
}
if (isIdentifierStart(ch)) {
return scanIdentifier();
}
// Dot (.) char #46 can also start a floating-point number, hence the need
// to check the next character.
if (ch === 46) {
if (isDecimalDigit(source.charCodeAt(index + 1))) {
return scanNumericLiteral();
}
return scanPunctuator();
}
if (isDecimalDigit(ch)) {
return scanNumericLiteral();
}
return scanPunctuator();
}
function lex() {
var token;
token = lookahead;
index = token.range[1];
lookahead = advance();
index = token.range[1];
return token;
}
function peek() {
var pos;
pos = index;
lookahead = advance();
index = pos;
}
// Throw an exception
function throwError(token, messageFormat) {
var error,
args = Array.prototype.slice.call(arguments, 2),
msg = messageFormat.replace(
/%(\d)/g,
function (whole, index) {
assert(index < args.length, 'Message reference must be in range');
return args[index];
}
);
error = new Error(msg);
error.index = index;
error.description = msg;
throw error;
}
// Throw an exception because of the token.
function throwUnexpected(token) {
throwError(token, Messages.UnexpectedToken, token.value);
}
// Expect the next token to match the specified punctuator.
// If not, an exception will be thrown.
function expect(value) {
var token = lex();
if (token.type !== Token.Punctuator || token.value !== value) {
throwUnexpected(token);
}
}
// Return true if the next token matches the specified punctuator.
function match(value) {
return lookahead.type === Token.Punctuator && lookahead.value === value;
}
// Return true if the next token matches the specified keyword
function matchKeyword(keyword) {
return lookahead.type === Token.Keyword && lookahead.value === keyword;
}
function consumeSemicolon() {
// Catch the very common case first: immediately a semicolon (char #59).
if (source.charCodeAt(index) === 59) {
lex();
return;
}
skipWhitespace();
if (match(';')) {
lex();
return;
}
if (lookahead.type !== Token.EOF && !match('}')) {
throwUnexpected(lookahead);
}
}
// 11.1.4 Array Initialiser
function parseArrayInitialiser() {
var elements = [];
expect('[');
while (!match(']')) {
if (match(',')) {
lex();
elements.push(null);
} else {
elements.push(parseExpression());
if (!match(']')) {
expect(',');
}
}
}
expect(']');
return delegate.createArrayExpression(elements);
}
// 11.1.5 Object Initialiser
function parseObjectPropertyKey() {
var token;
skipWhitespace();
token = lex();
// Note: This function is called only from parseObjectProperty(), where
// EOF and Punctuator tokens are already filtered out.
if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) {
return delegate.createLiteral(token);
}
return delegate.createIdentifier(token.value);
}
function parseObjectProperty() {
var token, key;
token = lookahead;
skipWhitespace();
if (token.type === Token.EOF || token.type === Token.Punctuator) {
throwUnexpected(token);
}
key = parseObjectPropertyKey();
expect(':');
return delegate.createProperty('init', key, parseExpression());
}
function parseObjectInitialiser() {
var properties = [];
expect('{');
while (!match('}')) {
properties.push(parseObjectProperty());
if (!match('}')) {
expect(',');
}
}
expect('}');
return delegate.createObjectExpression(properties);
}
// 11.1.6 The Grouping Operator
function parseGroupExpression() {
var expr;
expect('(');
expr = parseExpression();
expect(')');
return expr;
}
// 11.1 Primary Expressions
function parsePrimaryExpression() {
var type, token, expr;
if (match('(')) {
return parseGroupExpression();
}
type = lookahead.type;
if (type === Token.Identifier) {
expr = delegate.createIdentifier(lex().value);
} else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
expr = delegate.createLiteral(lex());
} else if (type === Token.Keyword) {
if (matchKeyword('this')) {
lex();
expr = delegate.createThisExpression();
}
} else if (type === Token.BooleanLiteral) {
token = lex();
token.value = (token.value === 'true');
expr = delegate.createLiteral(token);
} else if (type === Token.NullLiteral) {
token = lex();
token.value = null;
expr = delegate.createLiteral(token);
} else if (match('[')) {
expr = parseArrayInitialiser();
} else if (match('{')) {
expr = parseObjectInitialiser();
}
if (expr) {
return expr;
}
throwUnexpected(lex());
}
// 11.2 Left-Hand-Side Expressions
function parseArguments() {
var args = [];
expect('(');
if (!match(')')) {
while (index < length) {
args.push(parseExpression());
if (match(')')) {
break;
}
expect(',');
}
}
expect(')');
return args;
}
function parseNonComputedProperty() {
var token;
token = lex();
if (!isIdentifierName(token)) {
throwUnexpected(token);
}
return delegate.createIdentifier(token.value);
}
function parseNonComputedMember() {
expect('.');
return parseNonComputedProperty();
}
function parseComputedMember() {
var expr;
expect('[');
expr = parseExpression();
expect(']');
return expr;
}
function parseLeftHandSideExpression() {
var expr, args, property;
expr = parsePrimaryExpression();
while (true) {
if (match('[')) {
property = parseComputedMember();
expr = delegate.createMemberExpression('[', expr, property);
} else if (match('.')) {
property = parseNonComputedMember();
expr = delegate.createMemberExpression('.', expr, property);
} else if (match('(')) {
args = parseArguments();
expr = delegate.createCallExpression(expr, args);
} else {
break;
}
}
return expr;
}
// 11.3 Postfix Expressions
var parsePostfixExpression = parseLeftHandSideExpression;
// 11.4 Unary Operators
function parseUnaryExpression() {
var token, expr;
if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
expr = parsePostfixExpression();
} else if (match('+') || match('-') || match('!')) {
token = lex();
expr = parseUnaryExpression();
expr = delegate.createUnaryExpression(token.value, expr);
} else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
throwError({}, Messages.UnexpectedToken);
} else {
expr = parsePostfixExpression();
}
return expr;
}
function binaryPrecedence(token) {
var prec = 0;
if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
return 0;
}
switch (token.value) {
case '||':
prec = 1;
break;
case '&&':
prec = 2;
break;
case '==':
case '!=':
case '===':
case '!==':
prec = 6;
break;
case '<':
case '>':
case '<=':
case '>=':
case 'instanceof':
prec = 7;
break;
case 'in':
prec = 7;
break;
case '+':
case '-':
prec = 9;
break;
case '*':
case '/':
case '%':
prec = 11;
break;
default:
break;
}
return prec;
}
// 11.5 Multiplicative Operators
// 11.6 Additive Operators
// 11.7 Bitwise Shift Operators
// 11.8 Relational Operators
// 11.9 Equality Operators
// 11.10 Binary Bitwise Operators
// 11.11 Binary Logical Operators
function parseBinaryExpression() {
var expr, token, prec, stack, right, operator, left, i;
left = parseUnaryExpression();
token = lookahead;
prec = binaryPrecedence(token);
if (prec === 0) {
return left;
}
token.prec = prec;
lex();
right = parseUnaryExpression();
stack = [left, token, right];
while ((prec = binaryPrecedence(lookahead)) > 0) {
// Reduce: make a binary expression from the three topmost entries.
while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
right = stack.pop();
operator = stack.pop().value;
left = stack.pop();
expr = delegate.createBinaryExpression(operator, left, right);
stack.push(expr);
}
// Shift.
token = lex();
token.prec = prec;
stack.push(token);
expr = parseUnaryExpression();
stack.push(expr);
}
// Final reduce to clean-up the stack.
i = stack.length - 1;
expr = stack[i];
while (i > 1) {
expr = delegate.createBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
i -= 2;
}
return expr;
}
// 11.12 Conditional Operator
function parseConditionalExpression() {
var expr, consequent, alternate;
expr = parseBinaryExpression();
if (match('?')) {
lex();
consequent = parseConditionalExpression();
expect(':');
alternate = parseConditionalExpression();
expr = delegate.createConditionalExpression(expr, consequent, alternate);
}
return expr;
}
// Simplification since we do not support AssignmentExpression.
var parseExpression = parseConditionalExpression;
// Polymer Syntax extensions
// Filter ::
// Identifier
// Identifier "(" ")"
// Identifier "(" FilterArguments ")"
function parseFilter() {
var identifier, args;
identifier = lex();
if (identifier.type !== Token.Identifier) {
throwUnexpected(identifier);
}
args = match('(') ? parseArguments() : [];
return delegate.createFilter(identifier.value, args);
}
// Filters ::
// "|" Filter
// Filters "|" Filter
function parseFilters() {
while (match('|')) {
lex();
parseFilter();
}
}
// TopLevel ::
// LabelledExpressions
// AsExpression
// InExpression
// FilterExpression
// AsExpression ::
// FilterExpression as Identifier
// InExpression ::
// Identifier, Identifier in FilterExpression
// Identifier in FilterExpression
// FilterExpression ::
// Expression
// Expression Filters
function parseTopLevel() {
skipWhitespace();
peek();
var expr = parseExpression();
if (expr) {
if (lookahead.value === ',' || lookahead.value == 'in' &&
expr.type === Syntax.Identifier) {
parseInExpression(expr);
} else {
parseFilters();
if (lookahead.value === 'as') {
parseAsExpression(expr);
} else {
delegate.createTopLevel(expr);
}
}
}
if (lookahead.type !== Token.EOF) {
throwUnexpected(lookahead);
}
}
function parseAsExpression(expr) {
lex(); // as
var identifier = lex().value;
delegate.createAsExpression(expr, identifier);
}
function parseInExpression(identifier) {
var indexName;
if (lookahead.value === ',') {
lex();
if (lookahead.type !== Token.Identifier)
throwUnexpected(lookahead);
indexName = lex().value;
}
lex(); // in
var expr = parseExpression();
parseFilters();
delegate.createInExpression(identifier.name, indexName, expr);
}
function parse(code, inDelegate) {
delegate = inDelegate;
source = code;
index = 0;
length = source.length;
lookahead = null;
state = {
labelSet: {}
};
return parseTopLevel();
}
global.esprima = {
parse: parse
};
})(this);
// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
// Code distributed by Google as part of the polymer project is also
// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
(function (global) {
'use strict';
function prepareBinding(expressionText, name, node, filterRegistry) {
var expression;
try {
expression = getExpression(expressionText);
if (expression.scopeIdent &&
(node.nodeType !== Node.ELEMENT_NODE ||
node.tagName !== 'TEMPLATE' ||
(name !== 'bind' && name !== 'repeat'))) {
throw Error('as and in can only be used within ');
}
} catch (ex) {
console.error('Invalid expression syntax: ' + expressionText, ex);
return;
}
return function(model, node, oneTime) {
var binding = expression.getBinding(model, filterRegistry, oneTime);
if (expression.scopeIdent && binding) {
node.polymerExpressionScopeIdent_ = expression.scopeIdent;
if (expression.indexIdent)
node.polymerExpressionIndexIdent_ = expression.indexIdent;
}
return binding;
}
}
// TODO(rafaelw): Implement simple LRU.
var expressionParseCache = Object.create(null);
function getExpression(expressionText) {
var expression = expressionParseCache[expressionText];
if (!expression) {
var delegate = new ASTDelegate();
esprima.parse(expressionText, delegate);
expression = new Expression(delegate);
expressionParseCache[expressionText] = expression;
}
return expression;
}
function Literal(value) {
this.value = value;
this.valueFn_ = undefined;
}
Literal.prototype = {
valueFn: function() {
if (!this.valueFn_) {
var value = this.value;
this.valueFn_ = function() {
return value;
}
}
return this.valueFn_;
}
}
function IdentPath(name) {
this.name = name;
this.path = Path.get(name);
}
IdentPath.prototype = {
valueFn: function() {
if (!this.valueFn_) {
var name = this.name;
var path = this.path;
this.valueFn_ = function(model, observer) {
if (observer)
observer.addPath(model, path);
return path.getValueFrom(model);
}
}
return this.valueFn_;
},
setValue: function(model, newValue) {
if (this.path.length == 1);
model = findScope(model, this.path[0]);
return this.path.setValueFrom(model, newValue);
}
};
function MemberExpression(object, property, accessor) {
this.computed = accessor == '[';
this.dynamicDeps = typeof object == 'function' ||
object.dynamicDeps ||
(this.computed && !(property instanceof Literal));
this.simplePath =
!this.dynamicDeps &&
(property instanceof IdentPath || property instanceof Literal) &&
(object instanceof MemberExpression || object instanceof IdentPath);
this.object = this.simplePath ? object : getFn(object);
this.property = !this.computed || this.simplePath ?
property : getFn(property);
}
MemberExpression.prototype = {
get fullPath() {
if (!this.fullPath_) {
var parts = this.object instanceof MemberExpression ?
this.object.fullPath.slice() : [this.object.name];
parts.push(this.property instanceof IdentPath ?
this.property.name : this.property.value);
this.fullPath_ = Path.get(parts);
}
return this.fullPath_;
},
valueFn: function() {
if (!this.valueFn_) {
var object = this.object;
if (this.simplePath) {
var path = this.fullPath;
this.valueFn_ = function(model, observer) {
if (observer)
observer.addPath(model, path);
return path.getValueFrom(model);
};
} else if (!this.computed) {
var path = Path.get(this.property.name);
this.valueFn_ = function(model, observer, filterRegistry) {
var context = object(model, observer, filterRegistry);
if (observer)
observer.addPath(context, path);
return path.getValueFrom(context);
}
} else {
// Computed property.
var property = this.property;
this.valueFn_ = function(model, observer, filterRegistry) {
var context = object(model, observer, filterRegistry);
var propName = property(model, observer, filterRegistry);
if (observer)
observer.addPath(context, [propName]);
return context ? context[propName] : undefined;
};
}
}
return this.valueFn_;
},
setValue: function(model, newValue) {
if (this.simplePath) {
this.fullPath.setValueFrom(model, newValue);
return newValue;
}
var object = this.object(model);
var propName = this.property instanceof IdentPath ? this.property.name :
this.property(model);
return object[propName] = newValue;
}
};
function Filter(name, args) {
this.name = name;
this.args = [];
for (var i = 0; i < args.length; i++) {
this.args[i] = getFn(args[i]);
}
}
Filter.prototype = {
transform: function(model, observer, filterRegistry, toModelDirection,
initialArgs) {
var fn = filterRegistry[this.name];
var context = model;
if (fn) {
context = undefined;
} else {
fn = context[this.name];
if (!fn) {
console.error('Cannot find function or filter: ' + this.name);
return;
}
}
// If toModelDirection is falsey, then the "normal" (dom-bound) direction
// is used. Otherwise, it looks for a 'toModel' property function on the
// object.
if (toModelDirection) {
fn = fn.toModel;
} else if (typeof fn.toDOM == 'function') {
fn = fn.toDOM;
}
if (typeof fn != 'function') {
console.error('Cannot find function or filter: ' + this.name);
return;
}
var args = initialArgs || [];
for (var i = 0; i < this.args.length; i++) {
args.push(getFn(this.args[i])(model, observer, filterRegistry));
}
return fn.apply(context, args);
}
};
function notImplemented() { throw Error('Not Implemented'); }
var unaryOperators = {
'+': function(v) { return +v; },
'-': function(v) { return -v; },
'!': function(v) { return !v; }
};
var binaryOperators = {
'+': function(l, r) { return l+r; },
'-': function(l, r) { return l-r; },
'*': function(l, r) { return l*r; },
'/': function(l, r) { return l/r; },
'%': function(l, r) { return l%r; },
'<': function(l, r) { return l': function(l, r) { return l>r; },
'<=': function(l, r) { return l<=r; },
'>=': function(l, r) { return l>=r; },
'==': function(l, r) { return l==r; },
'!=': function(l, r) { return l!=r; },
'===': function(l, r) { return l===r; },
'!==': function(l, r) { return l!==r; },
'&&': function(l, r) { return l&&r; },
'||': function(l, r) { return l||r; },
};
function getFn(arg) {
return typeof arg == 'function' ? arg : arg.valueFn();
}
function ASTDelegate() {
this.expression = null;
this.filters = [];
this.deps = {};
this.currentPath = undefined;
this.scopeIdent = undefined;
this.indexIdent = undefined;
this.dynamicDeps = false;
}
ASTDelegate.prototype = {
createUnaryExpression: function(op, argument) {
if (!unaryOperators[op])
throw Error('Disallowed operator: ' + op);
argument = getFn(argument);
return function(model, observer, filterRegistry) {
return unaryOperators[op](argument(model, observer, filterRegistry));
};
},
createBinaryExpression: function(op, left, right) {
if (!binaryOperators[op])
throw Error('Disallowed operator: ' + op);
left = getFn(left);
right = getFn(right);
switch (op) {
case '||':
this.dynamicDeps = true;
return function(model, observer, filterRegistry) {
return left(model, observer, filterRegistry) ||
right(model, observer, filterRegistry);
};
case '&&':
this.dynamicDeps = true;
return function(model, observer, filterRegistry) {
return left(model, observer, filterRegistry) &&
right(model, observer, filterRegistry);
};
}
return function(model, observer, filterRegistry) {
return binaryOperators[op](left(model, observer, filterRegistry),
right(model, observer, filterRegistry));
};
},
createConditionalExpression: function(test, consequent, alternate) {
test = getFn(test);
consequent = getFn(consequent);
alternate = getFn(alternate);
this.dynamicDeps = true;
return function(model, observer, filterRegistry) {
return test(model, observer, filterRegistry) ?
consequent(model, observer, filterRegistry) :
alternate(model, observer, filterRegistry);
}
},
createIdentifier: function(name) {
var ident = new IdentPath(name);
ident.type = 'Identifier';
return ident;
},
createMemberExpression: function(accessor, object, property) {
var ex = new MemberExpression(object, property, accessor);
if (ex.dynamicDeps)
this.dynamicDeps = true;
return ex;
},
createCallExpression: function(expression, args) {
if (!(expression instanceof IdentPath))
throw Error('Only identifier function invocations are allowed');
var filter = new Filter(expression.name, args);
return function(model, observer, filterRegistry) {
return filter.transform(model, observer, filterRegistry, false);
};
},
createLiteral: function(token) {
return new Literal(token.value);
},
createArrayExpression: function(elements) {
for (var i = 0; i < elements.length; i++)
elements[i] = getFn(elements[i]);
return function(model, observer, filterRegistry) {
var arr = []
for (var i = 0; i < elements.length; i++)
arr.push(elements[i](model, observer, filterRegistry));
return arr;
}
},
createProperty: function(kind, key, value) {
return {
key: key instanceof IdentPath ? key.name : key.value,
value: value
};
},
createObjectExpression: function(properties) {
for (var i = 0; i < properties.length; i++)
properties[i].value = getFn(properties[i].value);
return function(model, observer, filterRegistry) {
var obj = {};
for (var i = 0; i < properties.length; i++)
obj[properties[i].key] =
properties[i].value(model, observer, filterRegistry);
return obj;
}
},
createFilter: function(name, args) {
this.filters.push(new Filter(name, args));
},
createAsExpression: function(expression, scopeIdent) {
this.expression = expression;
this.scopeIdent = scopeIdent;
},
createInExpression: function(scopeIdent, indexIdent, expression) {
this.expression = expression;
this.scopeIdent = scopeIdent;
this.indexIdent = indexIdent;
},
createTopLevel: function(expression) {
this.expression = expression;
},
createThisExpression: notImplemented
}
function ConstantObservable(value) {
this.value_ = value;
}
ConstantObservable.prototype = {
open: function() { return this.value_; },
discardChanges: function() { return this.value_; },
deliver: function() {},
close: function() {},
}
function Expression(delegate) {
this.scopeIdent = delegate.scopeIdent;
this.indexIdent = delegate.indexIdent;
if (!delegate.expression)
throw Error('No expression found.');
this.expression = delegate.expression;
getFn(this.expression); // forces enumeration of path dependencies
this.filters = delegate.filters;
this.dynamicDeps = delegate.dynamicDeps;
}
Expression.prototype = {
getBinding: function(model, filterRegistry, oneTime) {
if (oneTime)
return this.getValue(model, undefined, filterRegistry);
var observer = new CompoundObserver();
// captures deps.
var firstValue = this.getValue(model, observer, filterRegistry);
var firstTime = true;
var self = this;
function valueFn() {
// deps cannot have changed on first value retrieval.
if (firstTime) {
firstTime = false;
return firstValue;
}
if (self.dynamicDeps)
observer.startReset();
var value = self.getValue(model,
self.dynamicDeps ? observer : undefined,
filterRegistry);
if (self.dynamicDeps)
observer.finishReset();
return value;
}
function setValueFn(newValue) {
self.setValue(model, newValue, filterRegistry);
return newValue;
}
return new ObserverTransform(observer, valueFn, setValueFn, true);
},
getValue: function(model, observer, filterRegistry) {
var value = getFn(this.expression)(model, observer, filterRegistry);
for (var i = 0; i < this.filters.length; i++) {
value = this.filters[i].transform(model, observer, filterRegistry,
false, [value]);
}
return value;
},
setValue: function(model, newValue, filterRegistry) {
var count = this.filters ? this.filters.length : 0;
while (count-- > 0) {
newValue = this.filters[count].transform(model, undefined,
filterRegistry, true, [newValue]);
}
if (this.expression.setValue)
return this.expression.setValue(model, newValue);
}
}
/**
* Converts a style property name to a css property name. For example:
* "WebkitUserSelect" to "-webkit-user-select"
*/
function convertStylePropertyName(name) {
return String(name).replace(/[A-Z]/g, function(c) {
return '-' + c.toLowerCase();
});
}
var parentScopeName = '@' + Math.random().toString(36).slice(2);
// Single ident paths must bind directly to the appropriate scope object.
// I.e. Pushed values in two-bindings need to be assigned to the actual model
// object.
function findScope(model, prop) {
while (model[parentScopeName] &&
!Object.prototype.hasOwnProperty.call(model, prop)) {
model = model[parentScopeName];
}
return model;
}
function isLiteralExpression(pathString) {
switch (pathString) {
case '':
return false;
case 'false':
case 'null':
case 'true':
return true;
}
if (!isNaN(Number(pathString)))
return true;
return false;
};
function PolymerExpressions() {}
PolymerExpressions.prototype = {
// "built-in" filters
styleObject: function(value) {
var parts = [];
for (var key in value) {
parts.push(convertStylePropertyName(key) + ': ' + value[key]);
}
return parts.join('; ');
},
tokenList: function(value) {
var tokens = [];
for (var key in value) {
if (value[key])
tokens.push(key);
}
return tokens.join(' ');
},
// binding delegate API
prepareInstancePositionChanged: function(template) {
var indexIdent = template.polymerExpressionIndexIdent_;
if (!indexIdent)
return;
return function(templateInstance, index) {
templateInstance.model[indexIdent] = index;
};
},
prepareBinding: function(pathString, name, node) {
var path = Path.get(pathString);
if (!isLiteralExpression(pathString) && path.valid) {
if (path.length == 1) {
return function(model, node, oneTime) {
if (oneTime)
return path.getValueFrom(model);
var scope = findScope(model, path[0]);
return new PathObserver(scope, path);
};
}
return; // bail out early if pathString is simple path.
}
return prepareBinding(pathString, name, node, this);
},
prepareInstanceModel: function(template) {
var scopeName = template.polymerExpressionScopeIdent_;
if (!scopeName)
return;
var parentScope = template.templateInstance ?
template.templateInstance.model :
template.model;
var indexName = template.polymerExpressionIndexIdent_;
return function(model) {
return createScopeObject(parentScope, model, scopeName, indexName);
};
}
};
var createScopeObject = ('__proto__' in {}) ?
function(parentScope, model, scopeName, indexName) {
var scope = {};
scope[scopeName] = model;
scope[indexName] = undefined;
scope[parentScopeName] = parentScope;
scope.__proto__ = parentScope;
return scope;
} :
function(parentScope, model, scopeName, indexName) {
var scope = Object.create(parentScope);
Object.defineProperty(scope, scopeName,
{ value: model, configurable: true, writable: true });
Object.defineProperty(scope, indexName,
{ value: undefined, configurable: true, writable: true });
Object.defineProperty(scope, parentScopeName,
{ value: parentScope, configurable: true, writable: true });
return scope;
};
global.PolymerExpressions = PolymerExpressions;
PolymerExpressions.getExpression = getExpression;
})(this);
Polymer = {
version: '0.5.1'
};
// TODO(sorvell): this ensures Polymer is an object and not a function
// Platform is currently defining it as a function to allow for async loading
// of polymer; once we refine the loading process this likely goes away.
if (typeof window.Polymer === 'function') {
Polymer = {};
}
(function(scope) {
function withDependencies(task, depends) {
depends = depends || [];
if (!depends.map) {
depends = [depends];
}
return task.apply(this, depends.map(marshal));
}
function module(name, dependsOrFactory, moduleFactory) {
var module;
switch (arguments.length) {
case 0:
return;
case 1:
module = null;
break;
case 2:
// dependsOrFactory is `factory` in this case
module = dependsOrFactory.apply(this);
break;
default:
// dependsOrFactory is `depends` in this case
module = withDependencies(moduleFactory, dependsOrFactory);
break;
}
modules[name] = module;
};
function marshal(name) {
return modules[name];
}
var modules = {};
function using(depends, task) {
HTMLImports.whenImportsReady(function() {
withDependencies(task, depends);
});
};
// exports
scope.marshal = marshal;
// `module` confuses commonjs detectors
scope.modularize = module;
scope.using = using;
})(window);
/*
Build only script.
Ensures scripts needed for basic x-platform compatibility
will be run when platform.js is not loaded.
*/
if (!window.WebComponents) {
/*
On supported platforms, platform.js is not needed. To retain compatibility
with the polyfills, we stub out minimal functionality.
*/
if (!window.WebComponents) {
WebComponents = {
flush: function() {},
flags: {log: {}}
};
Platform = WebComponents;
CustomElements = {
useNative: true,
ready: true,
takeRecords: function() {},
instanceof: function(obj, base) {
return obj instanceof base;
}
};
HTMLImports = {
useNative: true
};
addEventListener('HTMLImportsLoaded', function() {
document.dispatchEvent(
new CustomEvent('WebComponentsReady', {bubbles: true})
);
});
// ShadowDOM
ShadowDOMPolyfill = null;
wrap = unwrap = function(n){
return n;
};
}
/*
Create polyfill scope and feature detect native support.
*/
window.HTMLImports = window.HTMLImports || {flags:{}};
(function(scope) {
/**
Basic setup and simple module executer. We collect modules and then execute
the code later, only if it's necessary for polyfilling.
*/
var IMPORT_LINK_TYPE = 'import';
var useNative = Boolean(IMPORT_LINK_TYPE in document.createElement('link'));
/**
Support `currentScript` on all browsers as `document._currentScript.`
NOTE: We cannot polyfill `document.currentScript` because it's not possible
both to override and maintain the ability to capture the native value.
Therefore we choose to expose `_currentScript` both when native imports
and the polyfill are in use.
*/
// NOTE: ShadowDOMPolyfill intrusion.
var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill);
var wrap = function(node) {
return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node;
};
var rootDocument = wrap(document);
var currentScriptDescriptor = {
get: function() {
var script = HTMLImports.currentScript || document.currentScript ||
// NOTE: only works when called in synchronously executing code.
// readyState should check if `loading` but IE10 is
// interactive when scripts run so we cheat.
(document.readyState !== 'complete' ?
document.scripts[document.scripts.length - 1] : null);
return wrap(script);
},
configurable: true
};
Object.defineProperty(document, '_currentScript', currentScriptDescriptor);
Object.defineProperty(rootDocument, '_currentScript', currentScriptDescriptor);
/**
Add support for the `HTMLImportsLoaded` event and the `HTMLImports.whenReady`
method. This api is necessary because unlike the native implementation,
script elements do not force imports to resolve. Instead, users should wrap
code in either an `HTMLImportsLoaded` hander or after load time in an
`HTMLImports.whenReady(callback)` call.
NOTE: This module also supports these apis under the native implementation.
Therefore, if this file is loaded, the same code can be used under both
the polyfill and native implementation.
*/
var isIE = /Trident/.test(navigator.userAgent);
// call a callback when all HTMLImports in the document at call time
// (or at least document ready) have loaded.
// 1. ensure the document is in a ready state (has dom), then
// 2. watch for loading of imports and call callback when done
function whenReady(callback, doc) {
doc = doc || rootDocument;
// if document is loading, wait and try again
whenDocumentReady(function() {
watchImportsLoad(callback, doc);
}, doc);
}
// call the callback when the document is in a ready state (has dom)
var requiredReadyState = isIE ? 'complete' : 'interactive';
var READY_EVENT = 'readystatechange';
function isDocumentReady(doc) {
return (doc.readyState === 'complete' ||
doc.readyState === requiredReadyState);
}
// call when we ensure the document is in a ready state
function whenDocumentReady(callback, doc) {
if (!isDocumentReady(doc)) {
var checkReady = function() {
if (doc.readyState === 'complete' ||
doc.readyState === requiredReadyState) {
doc.removeEventListener(READY_EVENT, checkReady);
whenDocumentReady(callback, doc);
}
};
doc.addEventListener(READY_EVENT, checkReady);
} else if (callback) {
callback();
}
}
function markTargetLoaded(event) {
event.target.__loaded = true;
}
// call when we ensure all imports have loaded
function watchImportsLoad(callback, doc) {
var imports = doc.querySelectorAll('link[rel=import]');
var loaded = 0, l = imports.length;
function checkDone(d) {
if ((loaded == l) && callback) {
callback();
}
}
function loadedImport(e) {
markTargetLoaded(e);
loaded++;
checkDone();
}
if (l) {
for (var i=0, imp; (i>> 0 && s !== '';
}
function toNumber(s) {
return +s;
}
function isObject(obj) {
return obj === Object(obj);
}
var numberIsNaN = global.Number.isNaN || function(value) {
return typeof value === 'number' && global.isNaN(value);
}
function areSameValue(left, right) {
if (left === right)
return left !== 0 || 1 / left === 1 / right;
if (numberIsNaN(left) && numberIsNaN(right))
return true;
return left !== left && right !== right;
}
var createObject = ('__proto__' in {}) ?
function(obj) { return obj; } :
function(obj) {
var proto = obj.__proto__;
if (!proto)
return obj;
var newObject = Object.create(proto);
Object.getOwnPropertyNames(obj).forEach(function(name) {
Object.defineProperty(newObject, name,
Object.getOwnPropertyDescriptor(obj, name));
});
return newObject;
};
var identStart = '[\$_a-zA-Z]';
var identPart = '[\$_a-zA-Z0-9]';
var identRegExp = new RegExp('^' + identStart + '+' + identPart + '*' + '$');
function getPathCharType(char) {
if (char === undefined)
return 'eof';
var code = char.charCodeAt(0);
switch(code) {
case 0x5B: // [
case 0x5D: // ]
case 0x2E: // .
case 0x22: // "
case 0x27: // '
case 0x30: // 0
return char;
case 0x5F: // _
case 0x24: // $
return 'ident';
case 0x20: // Space
case 0x09: // Tab
case 0x0A: // Newline
case 0x0D: // Return
case 0xA0: // No-break space
case 0xFEFF: // Byte Order Mark
case 0x2028: // Line Separator
case 0x2029: // Paragraph Separator
return 'ws';
}
// a-z, A-Z
if ((0x61 <= code && code <= 0x7A) || (0x41 <= code && code <= 0x5A))
return 'ident';
// 1-9
if (0x31 <= code && code <= 0x39)
return 'number';
return 'else';
}
var pathStateMachine = {
'beforePath': {
'ws': ['beforePath'],
'ident': ['inIdent', 'append'],
'[': ['beforeElement'],
'eof': ['afterPath']
},
'inPath': {
'ws': ['inPath'],
'.': ['beforeIdent'],
'[': ['beforeElement'],
'eof': ['afterPath']
},
'beforeIdent': {
'ws': ['beforeIdent'],
'ident': ['inIdent', 'append']
},
'inIdent': {
'ident': ['inIdent', 'append'],
'0': ['inIdent', 'append'],
'number': ['inIdent', 'append'],
'ws': ['inPath', 'push'],
'.': ['beforeIdent', 'push'],
'[': ['beforeElement', 'push'],
'eof': ['afterPath', 'push']
},
'beforeElement': {
'ws': ['beforeElement'],
'0': ['afterZero', 'append'],
'number': ['inIndex', 'append'],
"'": ['inSingleQuote', 'append', ''],
'"': ['inDoubleQuote', 'append', '']
},
'afterZero': {
'ws': ['afterElement', 'push'],
']': ['inPath', 'push']
},
'inIndex': {
'0': ['inIndex', 'append'],
'number': ['inIndex', 'append'],
'ws': ['afterElement'],
']': ['inPath', 'push']
},
'inSingleQuote': {
"'": ['afterElement'],
'eof': ['error'],
'else': ['inSingleQuote', 'append']
},
'inDoubleQuote': {
'"': ['afterElement'],
'eof': ['error'],
'else': ['inDoubleQuote', 'append']
},
'afterElement': {
'ws': ['afterElement'],
']': ['inPath', 'push']
}
}
function noop() {}
function parsePath(path) {
var keys = [];
var index = -1;
var c, newChar, key, type, transition, action, typeMap, mode = 'beforePath';
var actions = {
push: function() {
if (key === undefined)
return;
keys.push(key);
key = undefined;
},
append: function() {
if (key === undefined)
key = newChar
else
key += newChar;
}
};
function maybeUnescapeQuote() {
if (index >= path.length)
return;
var nextChar = path[index + 1];
if ((mode == 'inSingleQuote' && nextChar == "'") ||
(mode == 'inDoubleQuote' && nextChar == '"')) {
index++;
newChar = nextChar;
actions.append();
return true;
}
}
while (mode) {
index++;
c = path[index];
if (c == '\\' && maybeUnescapeQuote(mode))
continue;
type = getPathCharType(c);
typeMap = pathStateMachine[mode];
transition = typeMap[type] || typeMap['else'] || 'error';
if (transition == 'error')
return; // parse error;
mode = transition[0];
action = actions[transition[1]] || noop;
newChar = transition[2] === undefined ? c : transition[2];
action();
if (mode === 'afterPath') {
return keys;
}
}
return; // parse error
}
function isIdent(s) {
return identRegExp.test(s);
}
var constructorIsPrivate = {};
function Path(parts, privateToken) {
if (privateToken !== constructorIsPrivate)
throw Error('Use Path.get to retrieve path objects');
for (var i = 0; i < parts.length; i++) {
this.push(String(parts[i]));
}
if (hasEval && this.length) {
this.getValueFrom = this.compiledGetValueFromFn();
}
}
// TODO(rafaelw): Make simple LRU cache
var pathCache = {};
function getPath(pathString) {
if (pathString instanceof Path)
return pathString;
if (pathString == null || pathString.length == 0)
pathString = '';
if (typeof pathString != 'string') {
if (isIndex(pathString.length)) {
// Constructed with array-like (pre-parsed) keys
return new Path(pathString, constructorIsPrivate);
}
pathString = String(pathString);
}
var path = pathCache[pathString];
if (path)
return path;
var parts = parsePath(pathString);
if (!parts)
return invalidPath;
var path = new Path(parts, constructorIsPrivate);
pathCache[pathString] = path;
return path;
}
Path.get = getPath;
function formatAccessor(key) {
if (isIndex(key)) {
return '[' + key + ']';
} else {
return '["' + key.replace(/"/g, '\\"') + '"]';
}
}
Path.prototype = createObject({
__proto__: [],
valid: true,
toString: function() {
var pathString = '';
for (var i = 0; i < this.length; i++) {
var key = this[i];
if (isIdent(key)) {
pathString += i ? '.' + key : key;
} else {
pathString += formatAccessor(key);
}
}
return pathString;
},
getValueFrom: function(obj, directObserver) {
for (var i = 0; i < this.length; i++) {
if (obj == null)
return;
obj = obj[this[i]];
}
return obj;
},
iterateObjects: function(obj, observe) {
for (var i = 0; i < this.length; i++) {
if (i)
obj = obj[this[i - 1]];
if (!isObject(obj))
return;
observe(obj, this[i]);
}
},
compiledGetValueFromFn: function() {
var str = '';
var pathString = 'obj';
str += 'if (obj != null';
var i = 0;
var key;
for (; i < (this.length - 1); i++) {
key = this[i];
pathString += isIdent(key) ? '.' + key : formatAccessor(key);
str += ' &&\n ' + pathString + ' != null';
}
str += ')\n';
var key = this[i];
pathString += isIdent(key) ? '.' + key : formatAccessor(key);
str += ' return ' + pathString + ';\nelse\n return undefined;';
return new Function('obj', str);
},
setValueFrom: function(obj, value) {
if (!this.length)
return false;
for (var i = 0; i < this.length - 1; i++) {
if (!isObject(obj))
return false;
obj = obj[this[i]];
}
if (!isObject(obj))
return false;
obj[this[i]] = value;
return true;
}
});
var invalidPath = new Path('', constructorIsPrivate);
invalidPath.valid = false;
invalidPath.getValueFrom = invalidPath.setValueFrom = function() {};
var MAX_DIRTY_CHECK_CYCLES = 1000;
function dirtyCheck(observer) {
var cycles = 0;
while (cycles < MAX_DIRTY_CHECK_CYCLES && observer.check_()) {
cycles++;
}
if (testingExposeCycleCount)
global.dirtyCheckCycleCount = cycles;
return cycles > 0;
}
function objectIsEmpty(object) {
for (var prop in object)
return false;
return true;
}
function diffIsEmpty(diff) {
return objectIsEmpty(diff.added) &&
objectIsEmpty(diff.removed) &&
objectIsEmpty(diff.changed);
}
function diffObjectFromOldObject(object, oldObject) {
var added = {};
var removed = {};
var changed = {};
for (var prop in oldObject) {
var newValue = object[prop];
if (newValue !== undefined && newValue === oldObject[prop])
continue;
if (!(prop in object)) {
removed[prop] = undefined;
continue;
}
if (newValue !== oldObject[prop])
changed[prop] = newValue;
}
for (var prop in object) {
if (prop in oldObject)
continue;
added[prop] = object[prop];
}
if (Array.isArray(object) && object.length !== oldObject.length)
changed.length = object.length;
return {
added: added,
removed: removed,
changed: changed
};
}
var eomTasks = [];
function runEOMTasks() {
if (!eomTasks.length)
return false;
for (var i = 0; i < eomTasks.length; i++) {
eomTasks[i]();
}
eomTasks.length = 0;
return true;
}
var runEOM = hasObserve ? (function(){
return function(fn) {
return Promise.resolve().then(fn);
}
})() :
(function() {
return function(fn) {
eomTasks.push(fn);
};
})();
var observedObjectCache = [];
function newObservedObject() {
var observer;
var object;
var discardRecords = false;
var first = true;
function callback(records) {
if (observer && observer.state_ === OPENED && !discardRecords)
observer.check_(records);
}
return {
open: function(obs) {
if (observer)
throw Error('ObservedObject in use');
if (!first)
Object.deliverChangeRecords(callback);
observer = obs;
first = false;
},
observe: function(obj, arrayObserve) {
object = obj;
if (arrayObserve)
Array.observe(object, callback);
else
Object.observe(object, callback);
},
deliver: function(discard) {
discardRecords = discard;
Object.deliverChangeRecords(callback);
discardRecords = false;
},
close: function() {
observer = undefined;
Object.unobserve(object, callback);
observedObjectCache.push(this);
}
};
}
/*
* The observedSet abstraction is a perf optimization which reduces the total
* number of Object.observe observations of a set of objects. The idea is that
* groups of Observers will have some object dependencies in common and this
* observed set ensures that each object in the transitive closure of
* dependencies is only observed once. The observedSet acts as a write barrier
* such that whenever any change comes through, all Observers are checked for
* changed values.
*
* Note that this optimization is explicitly moving work from setup-time to
* change-time.
*
* TODO(rafaelw): Implement "garbage collection". In order to move work off
* the critical path, when Observers are closed, their observed objects are
* not Object.unobserve(d). As a result, it's possible that if the observedSet
* is kept open, but some Observers have been closed, it could cause "leaks"
* (prevent otherwise collectable objects from being collected). At some
* point, we should implement incremental "gc" which keeps a list of
* observedSets which may need clean-up and does small amounts of cleanup on a
* timeout until all is clean.
*/
function getObservedObject(observer, object, arrayObserve) {
var dir = observedObjectCache.pop() || newObservedObject();
dir.open(observer);
dir.observe(object, arrayObserve);
return dir;
}
var observedSetCache = [];
function newObservedSet() {
var observerCount = 0;
var observers = [];
var objects = [];
var rootObj;
var rootObjProps;
function observe(obj, prop) {
if (!obj)
return;
if (obj === rootObj)
rootObjProps[prop] = true;
if (objects.indexOf(obj) < 0) {
objects.push(obj);
Object.observe(obj, callback);
}
observe(Object.getPrototypeOf(obj), prop);
}
function allRootObjNonObservedProps(recs) {
for (var i = 0; i < recs.length; i++) {
var rec = recs[i];
if (rec.object !== rootObj ||
rootObjProps[rec.name] ||
rec.type === 'setPrototype') {
return false;
}
}
return true;
}
function callback(recs) {
if (allRootObjNonObservedProps(recs))
return;
var observer;
for (var i = 0; i < observers.length; i++) {
observer = observers[i];
if (observer.state_ == OPENED) {
observer.iterateObjects_(observe);
}
}
for (var i = 0; i < observers.length; i++) {
observer = observers[i];
if (observer.state_ == OPENED) {
observer.check_();
}
}
}
var record = {
objects: objects,
get rootObject() { return rootObj; },
set rootObject(value) {
rootObj = value;
rootObjProps = {};
},
open: function(obs, object) {
observers.push(obs);
observerCount++;
obs.iterateObjects_(observe);
},
close: function(obs) {
observerCount--;
if (observerCount > 0) {
return;
}
for (var i = 0; i < objects.length; i++) {
Object.unobserve(objects[i], callback);
Observer.unobservedCount++;
}
observers.length = 0;
objects.length = 0;
rootObj = undefined;
rootObjProps = undefined;
observedSetCache.push(this);
if (lastObservedSet === this)
lastObservedSet = null;
},
};
return record;
}
var lastObservedSet;
function getObservedSet(observer, obj) {
if (!lastObservedSet || lastObservedSet.rootObject !== obj) {
lastObservedSet = observedSetCache.pop() || newObservedSet();
lastObservedSet.rootObject = obj;
}
lastObservedSet.open(observer, obj);
return lastObservedSet;
}
var UNOPENED = 0;
var OPENED = 1;
var CLOSED = 2;
var RESETTING = 3;
var nextObserverId = 1;
function Observer() {
this.state_ = UNOPENED;
this.callback_ = undefined;
this.target_ = undefined; // TODO(rafaelw): Should be WeakRef
this.directObserver_ = undefined;
this.value_ = undefined;
this.id_ = nextObserverId++;
}
Observer.prototype = {
open: function(callback, target) {
if (this.state_ != UNOPENED)
throw Error('Observer has already been opened.');
addToAll(this);
this.callback_ = callback;
this.target_ = target;
this.connect_();
this.state_ = OPENED;
return this.value_;
},
close: function() {
if (this.state_ != OPENED)
return;
removeFromAll(this);
this.disconnect_();
this.value_ = undefined;
this.callback_ = undefined;
this.target_ = undefined;
this.state_ = CLOSED;
},
deliver: function() {
if (this.state_ != OPENED)
return;
dirtyCheck(this);
},
report_: function(changes) {
try {
this.callback_.apply(this.target_, changes);
} catch (ex) {
Observer._errorThrownDuringCallback = true;
console.error('Exception caught during observer callback: ' +
(ex.stack || ex));
}
},
discardChanges: function() {
this.check_(undefined, true);
return this.value_;
}
}
var collectObservers = !hasObserve;
var allObservers;
Observer._allObserversCount = 0;
if (collectObservers) {
allObservers = [];
}
function addToAll(observer) {
Observer._allObserversCount++;
if (!collectObservers)
return;
allObservers.push(observer);
}
function removeFromAll(observer) {
Observer._allObserversCount--;
}
var runningMicrotaskCheckpoint = false;
global.Platform = global.Platform || {};
global.Platform.performMicrotaskCheckpoint = function() {
if (runningMicrotaskCheckpoint)
return;
if (!collectObservers)
return;
runningMicrotaskCheckpoint = true;
var cycles = 0;
var anyChanged, toCheck;
do {
cycles++;
toCheck = allObservers;
allObservers = [];
anyChanged = false;
for (var i = 0; i < toCheck.length; i++) {
var observer = toCheck[i];
if (observer.state_ != OPENED)
continue;
if (observer.check_())
anyChanged = true;
allObservers.push(observer);
}
if (runEOMTasks())
anyChanged = true;
} while (cycles < MAX_DIRTY_CHECK_CYCLES && anyChanged);
if (testingExposeCycleCount)
global.dirtyCheckCycleCount = cycles;
runningMicrotaskCheckpoint = false;
};
if (collectObservers) {
global.Platform.clearObservers = function() {
allObservers = [];
};
}
function ObjectObserver(object) {
Observer.call(this);
this.value_ = object;
this.oldObject_ = undefined;
}
ObjectObserver.prototype = createObject({
__proto__: Observer.prototype,
arrayObserve: false,
connect_: function(callback, target) {
if (hasObserve) {
this.directObserver_ = getObservedObject(this, this.value_,
this.arrayObserve);
} else {
this.oldObject_ = this.copyObject(this.value_);
}
},
copyObject: function(object) {
var copy = Array.isArray(object) ? [] : {};
for (var prop in object) {
copy[prop] = object[prop];
};
if (Array.isArray(object))
copy.length = object.length;
return copy;
},
check_: function(changeRecords, skipChanges) {
var diff;
var oldValues;
if (hasObserve) {
if (!changeRecords)
return false;
oldValues = {};
diff = diffObjectFromChangeRecords(this.value_, changeRecords,
oldValues);
} else {
oldValues = this.oldObject_;
diff = diffObjectFromOldObject(this.value_, this.oldObject_);
}
if (diffIsEmpty(diff))
return false;
if (!hasObserve)
this.oldObject_ = this.copyObject(this.value_);
this.report_([
diff.added || {},
diff.removed || {},
diff.changed || {},
function(property) {
return oldValues[property];
}
]);
return true;
},
disconnect_: function() {
if (hasObserve) {
this.directObserver_.close();
this.directObserver_ = undefined;
} else {
this.oldObject_ = undefined;
}
},
deliver: function() {
if (this.state_ != OPENED)
return;
if (hasObserve)
this.directObserver_.deliver(false);
else
dirtyCheck(this);
},
discardChanges: function() {
if (this.directObserver_)
this.directObserver_.deliver(true);
else
this.oldObject_ = this.copyObject(this.value_);
return this.value_;
}
});
function ArrayObserver(array) {
if (!Array.isArray(array))
throw Error('Provided object is not an Array');
ObjectObserver.call(this, array);
}
ArrayObserver.prototype = createObject({
__proto__: ObjectObserver.prototype,
arrayObserve: true,
copyObject: function(arr) {
return arr.slice();
},
check_: function(changeRecords) {
var splices;
if (hasObserve) {
if (!changeRecords)
return false;
splices = projectArraySplices(this.value_, changeRecords);
} else {
splices = calcSplices(this.value_, 0, this.value_.length,
this.oldObject_, 0, this.oldObject_.length);
}
if (!splices || !splices.length)
return false;
if (!hasObserve)
this.oldObject_ = this.copyObject(this.value_);
this.report_([splices]);
return true;
}
});
ArrayObserver.applySplices = function(previous, current, splices) {
splices.forEach(function(splice) {
var spliceArgs = [splice.index, splice.removed.length];
var addIndex = splice.index;
while (addIndex < splice.index + splice.addedCount) {
spliceArgs.push(current[addIndex]);
addIndex++;
}
Array.prototype.splice.apply(previous, spliceArgs);
});
};
function PathObserver(object, path) {
Observer.call(this);
this.object_ = object;
this.path_ = getPath(path);
this.directObserver_ = undefined;
}
PathObserver.prototype = createObject({
__proto__: Observer.prototype,
get path() {
return this.path_;
},
connect_: function() {
if (hasObserve)
this.directObserver_ = getObservedSet(this, this.object_);
this.check_(undefined, true);
},
disconnect_: function() {
this.value_ = undefined;
if (this.directObserver_) {
this.directObserver_.close(this);
this.directObserver_ = undefined;
}
},
iterateObjects_: function(observe) {
this.path_.iterateObjects(this.object_, observe);
},
check_: function(changeRecords, skipChanges) {
var oldValue = this.value_;
this.value_ = this.path_.getValueFrom(this.object_);
if (skipChanges || areSameValue(this.value_, oldValue))
return false;
this.report_([this.value_, oldValue, this]);
return true;
},
setValue: function(newValue) {
if (this.path_)
this.path_.setValueFrom(this.object_, newValue);
}
});
function CompoundObserver(reportChangesOnOpen) {
Observer.call(this);
this.reportChangesOnOpen_ = reportChangesOnOpen;
this.value_ = [];
this.directObserver_ = undefined;
this.observed_ = [];
}
var observerSentinel = {};
CompoundObserver.prototype = createObject({
__proto__: Observer.prototype,
connect_: function() {
if (hasObserve) {
var object;
var needsDirectObserver = false;
for (var i = 0; i < this.observed_.length; i += 2) {
object = this.observed_[i]
if (object !== observerSentinel) {
needsDirectObserver = true;
break;
}
}
if (needsDirectObserver)
this.directObserver_ = getObservedSet(this, object);
}
this.check_(undefined, !this.reportChangesOnOpen_);
},
disconnect_: function() {
for (var i = 0; i < this.observed_.length; i += 2) {
if (this.observed_[i] === observerSentinel)
this.observed_[i + 1].close();
}
this.observed_.length = 0;
this.value_.length = 0;
if (this.directObserver_) {
this.directObserver_.close(this);
this.directObserver_ = undefined;
}
},
addPath: function(object, path) {
if (this.state_ != UNOPENED && this.state_ != RESETTING)
throw Error('Cannot add paths once started.');
var path = getPath(path);
this.observed_.push(object, path);
if (!this.reportChangesOnOpen_)
return;
var index = this.observed_.length / 2 - 1;
this.value_[index] = path.getValueFrom(object);
},
addObserver: function(observer) {
if (this.state_ != UNOPENED && this.state_ != RESETTING)
throw Error('Cannot add observers once started.');
this.observed_.push(observerSentinel, observer);
if (!this.reportChangesOnOpen_)
return;
var index = this.observed_.length / 2 - 1;
this.value_[index] = observer.open(this.deliver, this);
},
startReset: function() {
if (this.state_ != OPENED)
throw Error('Can only reset while open');
this.state_ = RESETTING;
this.disconnect_();
},
finishReset: function() {
if (this.state_ != RESETTING)
throw Error('Can only finishReset after startReset');
this.state_ = OPENED;
this.connect_();
return this.value_;
},
iterateObjects_: function(observe) {
var object;
for (var i = 0; i < this.observed_.length; i += 2) {
object = this.observed_[i]
if (object !== observerSentinel)
this.observed_[i + 1].iterateObjects(object, observe)
}
},
check_: function(changeRecords, skipChanges) {
var oldValues;
for (var i = 0; i < this.observed_.length; i += 2) {
var object = this.observed_[i];
var path = this.observed_[i+1];
var value;
if (object === observerSentinel) {
var observable = path;
value = this.state_ === UNOPENED ?
observable.open(this.deliver, this) :
observable.discardChanges();
} else {
value = path.getValueFrom(object);
}
if (skipChanges) {
this.value_[i / 2] = value;
continue;
}
if (areSameValue(value, this.value_[i / 2]))
continue;
oldValues = oldValues || [];
oldValues[i / 2] = this.value_[i / 2];
this.value_[i / 2] = value;
}
if (!oldValues)
return false;
// TODO(rafaelw): Having observed_ as the third callback arg here is
// pretty lame API. Fix.
this.report_([this.value_, oldValues, this.observed_]);
return true;
}
});
function identFn(value) { return value; }
function ObserverTransform(observable, getValueFn, setValueFn,
dontPassThroughSet) {
this.callback_ = undefined;
this.target_ = undefined;
this.value_ = undefined;
this.observable_ = observable;
this.getValueFn_ = getValueFn || identFn;
this.setValueFn_ = setValueFn || identFn;
// TODO(rafaelw): This is a temporary hack. PolymerExpressions needs this
// at the moment because of a bug in it's dependency tracking.
this.dontPassThroughSet_ = dontPassThroughSet;
}
ObserverTransform.prototype = {
open: function(callback, target) {
this.callback_ = callback;
this.target_ = target;
this.value_ =
this.getValueFn_(this.observable_.open(this.observedCallback_, this));
return this.value_;
},
observedCallback_: function(value) {
value = this.getValueFn_(value);
if (areSameValue(value, this.value_))
return;
var oldValue = this.value_;
this.value_ = value;
this.callback_.call(this.target_, this.value_, oldValue);
},
discardChanges: function() {
this.value_ = this.getValueFn_(this.observable_.discardChanges());
return this.value_;
},
deliver: function() {
return this.observable_.deliver();
},
setValue: function(value) {
value = this.setValueFn_(value);
if (!this.dontPassThroughSet_ && this.observable_.setValue)
return this.observable_.setValue(value);
},
close: function() {
if (this.observable_)
this.observable_.close();
this.callback_ = undefined;
this.target_ = undefined;
this.observable_ = undefined;
this.value_ = undefined;
this.getValueFn_ = undefined;
this.setValueFn_ = undefined;
}
}
var expectedRecordTypes = {
add: true,
update: true,
delete: true
};
function diffObjectFromChangeRecords(object, changeRecords, oldValues) {
var added = {};
var removed = {};
for (var i = 0; i < changeRecords.length; i++) {
var record = changeRecords[i];
if (!expectedRecordTypes[record.type]) {
console.error('Unknown changeRecord type: ' + record.type);
console.error(record);
continue;
}
if (!(record.name in oldValues))
oldValues[record.name] = record.oldValue;
if (record.type == 'update')
continue;
if (record.type == 'add') {
if (record.name in removed)
delete removed[record.name];
else
added[record.name] = true;
continue;
}
// type = 'delete'
if (record.name in added) {
delete added[record.name];
delete oldValues[record.name];
} else {
removed[record.name] = true;
}
}
for (var prop in added)
added[prop] = object[prop];
for (var prop in removed)
removed[prop] = undefined;
var changed = {};
for (var prop in oldValues) {
if (prop in added || prop in removed)
continue;
var newValue = object[prop];
if (oldValues[prop] !== newValue)
changed[prop] = newValue;
}
return {
added: added,
removed: removed,
changed: changed
};
}
function newSplice(index, removed, addedCount) {
return {
index: index,
removed: removed,
addedCount: addedCount
};
}
var EDIT_LEAVE = 0;
var EDIT_UPDATE = 1;
var EDIT_ADD = 2;
var EDIT_DELETE = 3;
function ArraySplice() {}
ArraySplice.prototype = {
// Note: This function is *based* on the computation of the Levenshtein
// "edit" distance. The one change is that "updates" are treated as two
// edits - not one. With Array splices, an update is really a delete
// followed by an add. By retaining this, we optimize for "keeping" the
// maximum array items in the original array. For example:
//
// 'xxxx123' -> '123yyyy'
//
// With 1-edit updates, the shortest path would be just to update all seven
// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This
// leaves the substring '123' intact.
calcEditDistances: function(current, currentStart, currentEnd,
old, oldStart, oldEnd) {
// "Deletion" columns
var rowCount = oldEnd - oldStart + 1;
var columnCount = currentEnd - currentStart + 1;
var distances = new Array(rowCount);
// "Addition" rows. Initialize null column.
for (var i = 0; i < rowCount; i++) {
distances[i] = new Array(columnCount);
distances[i][0] = i;
}
// Initialize null row
for (var j = 0; j < columnCount; j++)
distances[0][j] = j;
for (var i = 1; i < rowCount; i++) {
for (var j = 1; j < columnCount; j++) {
if (this.equals(current[currentStart + j - 1], old[oldStart + i - 1]))
distances[i][j] = distances[i - 1][j - 1];
else {
var north = distances[i - 1][j] + 1;
var west = distances[i][j - 1] + 1;
distances[i][j] = north < west ? north : west;
}
}
}
return distances;
},
// This starts at the final weight, and walks "backward" by finding
// the minimum previous weight recursively until the origin of the weight
// matrix.
spliceOperationsFromEditDistances: function(distances) {
var i = distances.length - 1;
var j = distances[0].length - 1;
var current = distances[i][j];
var edits = [];
while (i > 0 || j > 0) {
if (i == 0) {
edits.push(EDIT_ADD);
j--;
continue;
}
if (j == 0) {
edits.push(EDIT_DELETE);
i--;
continue;
}
var northWest = distances[i - 1][j - 1];
var west = distances[i - 1][j];
var north = distances[i][j - 1];
var min;
if (west < north)
min = west < northWest ? west : northWest;
else
min = north < northWest ? north : northWest;
if (min == northWest) {
if (northWest == current) {
edits.push(EDIT_LEAVE);
} else {
edits.push(EDIT_UPDATE);
current = northWest;
}
i--;
j--;
} else if (min == west) {
edits.push(EDIT_DELETE);
i--;
current = west;
} else {
edits.push(EDIT_ADD);
j--;
current = north;
}
}
edits.reverse();
return edits;
},
/**
* Splice Projection functions:
*
* A splice map is a representation of how a previous array of items
* was transformed into a new array of items. Conceptually it is a list of
* tuples of
*
*
*
* which are kept in ascending index order of. The tuple represents that at
* the |index|, |removed| sequence of items were removed, and counting forward
* from |index|, |addedCount| items were added.
*/
/**
* Lacking individual splice mutation information, the minimal set of
* splices can be synthesized given the previous state and final state of an
* array. The basic approach is to calculate the edit distance matrix and
* choose the shortest path through it.
*
* Complexity: O(l * p)
* l: The length of the current array
* p: The length of the old array
*/
calcSplices: function(current, currentStart, currentEnd,
old, oldStart, oldEnd) {
var prefixCount = 0;
var suffixCount = 0;
var minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);
if (currentStart == 0 && oldStart == 0)
prefixCount = this.sharedPrefix(current, old, minLength);
if (currentEnd == current.length && oldEnd == old.length)
suffixCount = this.sharedSuffix(current, old, minLength - prefixCount);
currentStart += prefixCount;
oldStart += prefixCount;
currentEnd -= suffixCount;
oldEnd -= suffixCount;
if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)
return [];
if (currentStart == currentEnd) {
var splice = newSplice(currentStart, [], 0);
while (oldStart < oldEnd)
splice.removed.push(old[oldStart++]);
return [ splice ];
} else if (oldStart == oldEnd)
return [ newSplice(currentStart, [], currentEnd - currentStart) ];
var ops = this.spliceOperationsFromEditDistances(
this.calcEditDistances(current, currentStart, currentEnd,
old, oldStart, oldEnd));
var splice = undefined;
var splices = [];
var index = currentStart;
var oldIndex = oldStart;
for (var i = 0; i < ops.length; i++) {
switch(ops[i]) {
case EDIT_LEAVE:
if (splice) {
splices.push(splice);
splice = undefined;
}
index++;
oldIndex++;
break;
case EDIT_UPDATE:
if (!splice)
splice = newSplice(index, [], 0);
splice.addedCount++;
index++;
splice.removed.push(old[oldIndex]);
oldIndex++;
break;
case EDIT_ADD:
if (!splice)
splice = newSplice(index, [], 0);
splice.addedCount++;
index++;
break;
case EDIT_DELETE:
if (!splice)
splice = newSplice(index, [], 0);
splice.removed.push(old[oldIndex]);
oldIndex++;
break;
}
}
if (splice) {
splices.push(splice);
}
return splices;
},
sharedPrefix: function(current, old, searchLength) {
for (var i = 0; i < searchLength; i++)
if (!this.equals(current[i], old[i]))
return i;
return searchLength;
},
sharedSuffix: function(current, old, searchLength) {
var index1 = current.length;
var index2 = old.length;
var count = 0;
while (count < searchLength && this.equals(current[--index1], old[--index2]))
count++;
return count;
},
calculateSplices: function(current, previous) {
return this.calcSplices(current, 0, current.length, previous, 0,
previous.length);
},
equals: function(currentValue, previousValue) {
return currentValue === previousValue;
}
};
var arraySplice = new ArraySplice();
function calcSplices(current, currentStart, currentEnd,
old, oldStart, oldEnd) {
return arraySplice.calcSplices(current, currentStart, currentEnd,
old, oldStart, oldEnd);
}
function intersect(start1, end1, start2, end2) {
// Disjoint
if (end1 < start2 || end2 < start1)
return -1;
// Adjacent
if (end1 == start2 || end2 == start1)
return 0;
// Non-zero intersect, span1 first
if (start1 < start2) {
if (end1 < end2)
return end1 - start2; // Overlap
else
return end2 - start2; // Contained
} else {
// Non-zero intersect, span2 first
if (end2 < end1)
return end2 - start1; // Overlap
else
return end1 - start1; // Contained
}
}
function mergeSplice(splices, index, removed, addedCount) {
var splice = newSplice(index, removed, addedCount);
var inserted = false;
var insertionOffset = 0;
for (var i = 0; i < splices.length; i++) {
var current = splices[i];
current.index += insertionOffset;
if (inserted)
continue;
var intersectCount = intersect(splice.index,
splice.index + splice.removed.length,
current.index,
current.index + current.addedCount);
if (intersectCount >= 0) {
// Merge the two splices
splices.splice(i, 1);
i--;
insertionOffset -= current.addedCount - current.removed.length;
splice.addedCount += current.addedCount - intersectCount;
var deleteCount = splice.removed.length +
current.removed.length - intersectCount;
if (!splice.addedCount && !deleteCount) {
// merged splice is a noop. discard.
inserted = true;
} else {
var removed = current.removed;
if (splice.index < current.index) {
// some prefix of splice.removed is prepended to current.removed.
var prepend = splice.removed.slice(0, current.index - splice.index);
Array.prototype.push.apply(prepend, removed);
removed = prepend;
}
if (splice.index + splice.removed.length > current.index + current.addedCount) {
// some suffix of splice.removed is appended to current.removed.
var append = splice.removed.slice(current.index + current.addedCount - splice.index);
Array.prototype.push.apply(removed, append);
}
splice.removed = removed;
if (current.index < splice.index) {
splice.index = current.index;
}
}
} else if (splice.index < current.index) {
// Insert splice here.
inserted = true;
splices.splice(i, 0, splice);
i++;
var offset = splice.addedCount - splice.removed.length
current.index += offset;
insertionOffset += offset;
}
}
if (!inserted)
splices.push(splice);
}
function createInitialSplices(array, changeRecords) {
var splices = [];
for (var i = 0; i < changeRecords.length; i++) {
var record = changeRecords[i];
switch(record.type) {
case 'splice':
mergeSplice(splices, record.index, record.removed.slice(), record.addedCount);
break;
case 'add':
case 'update':
case 'delete':
if (!isIndex(record.name))
continue;
var index = toNumber(record.name);
if (index < 0)
continue;
mergeSplice(splices, index, [record.oldValue], 1);
break;
default:
console.error('Unexpected record type: ' + JSON.stringify(record));
break;
}
}
return splices;
}
function projectArraySplices(array, changeRecords) {
var splices = [];
createInitialSplices(array, changeRecords).forEach(function(splice) {
if (splice.addedCount == 1 && splice.removed.length == 1) {
if (splice.removed[0] !== array[splice.index])
splices.push(splice);
return
};
splices = splices.concat(calcSplices(array, splice.index, splice.index + splice.addedCount,
splice.removed, 0, splice.removed.length));
});
return splices;
}
// Export the observe-js object for **Node.js**, with
// backwards-compatibility for the old `require()` API. If we're in
// the browser, export as a global object.
var expose = global;
if (typeof exports !== 'undefined') {
if (typeof module !== 'undefined' && module.exports) {
expose = exports = module.exports;
}
expose = exports;
}
expose.Observer = Observer;
expose.Observer.runEOM_ = runEOM;
expose.Observer.observerSentinel_ = observerSentinel; // for testing.
expose.Observer.hasObjectObserve = hasObserve;
expose.ArrayObserver = ArrayObserver;
expose.ArrayObserver.calculateSplices = function(current, previous) {
return arraySplice.calculateSplices(current, previous);
};
expose.ArraySplice = ArraySplice;
expose.ObjectObserver = ObjectObserver;
expose.PathObserver = PathObserver;
expose.CompoundObserver = CompoundObserver;
expose.Path = Path;
expose.ObserverTransform = ObserverTransform;
})(typeof global !== 'undefined' && global && typeof module !== 'undefined' && module ? global : this || window);
// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
// Code distributed by Google as part of the polymer project is also
// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
(function(global) {
'use strict';
var filter = Array.prototype.filter.call.bind(Array.prototype.filter);
function getTreeScope(node) {
while (node.parentNode) {
node = node.parentNode;
}
return typeof node.getElementById === 'function' ? node : null;
}
Node.prototype.bind = function(name, observable) {
console.error('Unhandled binding to Node: ', this, name, observable);
};
Node.prototype.bindFinished = function() {};
function updateBindings(node, name, binding) {
var bindings = node.bindings_;
if (!bindings)
bindings = node.bindings_ = {};
if (bindings[name])
binding[name].close();
return bindings[name] = binding;
}
function returnBinding(node, name, binding) {
return binding;
}
function sanitizeValue(value) {
return value == null ? '' : value;
}
function updateText(node, value) {
node.data = sanitizeValue(value);
}
function textBinding(node) {
return function(value) {
return updateText(node, value);
};
}
var maybeUpdateBindings = returnBinding;
Object.defineProperty(Platform, 'enableBindingsReflection', {
get: function() {
return maybeUpdateBindings === updateBindings;
},
set: function(enable) {
maybeUpdateBindings = enable ? updateBindings : returnBinding;
return enable;
},
configurable: true
});
Text.prototype.bind = function(name, value, oneTime) {
if (name !== 'textContent')
return Node.prototype.bind.call(this, name, value, oneTime);
if (oneTime)
return updateText(this, value);
var observable = value;
updateText(this, observable.open(textBinding(this)));
return maybeUpdateBindings(this, name, observable);
}
function updateAttribute(el, name, conditional, value) {
if (conditional) {
if (value)
el.setAttribute(name, '');
else
el.removeAttribute(name);
return;
}
el.setAttribute(name, sanitizeValue(value));
}
function attributeBinding(el, name, conditional) {
return function(value) {
updateAttribute(el, name, conditional, value);
};
}
Element.prototype.bind = function(name, value, oneTime) {
var conditional = name[name.length - 1] == '?';
if (conditional) {
this.removeAttribute(name);
name = name.slice(0, -1);
}
if (oneTime)
return updateAttribute(this, name, conditional, value);
var observable = value;
updateAttribute(this, name, conditional,
observable.open(attributeBinding(this, name, conditional)));
return maybeUpdateBindings(this, name, observable);
};
var checkboxEventType;
(function() {
// Attempt to feature-detect which event (change or click) is fired first
// for checkboxes.
var div = document.createElement('div');
var checkbox = div.appendChild(document.createElement('input'));
checkbox.setAttribute('type', 'checkbox');
var first;
var count = 0;
checkbox.addEventListener('click', function(e) {
count++;
first = first || 'click';
});
checkbox.addEventListener('change', function() {
count++;
first = first || 'change';
});
var event = document.createEvent('MouseEvent');
event.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false,
false, false, false, 0, null);
checkbox.dispatchEvent(event);
// WebKit/Blink don't fire the change event if the element is outside the
// document, so assume 'change' for that case.
checkboxEventType = count == 1 ? 'change' : first;
})();
function getEventForInputType(element) {
switch (element.type) {
case 'checkbox':
return checkboxEventType;
case 'radio':
case 'select-multiple':
case 'select-one':
return 'change';
case 'range':
if (/Trident|MSIE/.test(navigator.userAgent))
return 'change';
default:
return 'input';
}
}
function updateInput(input, property, value, santizeFn) {
input[property] = (santizeFn || sanitizeValue)(value);
}
function inputBinding(input, property, santizeFn) {
return function(value) {
return updateInput(input, property, value, santizeFn);
}
}
function noop() {}
function bindInputEvent(input, property, observable, postEventFn) {
var eventType = getEventForInputType(input);
function eventHandler() {
observable.setValue(input[property]);
observable.discardChanges();
(postEventFn || noop)(input);
Platform.performMicrotaskCheckpoint();
}
input.addEventListener(eventType, eventHandler);
return {
close: function() {
input.removeEventListener(eventType, eventHandler);
observable.close();
},
observable_: observable
}
}
function booleanSanitize(value) {
return Boolean(value);
}
// |element| is assumed to be an HTMLInputElement with |type| == 'radio'.
// Returns an array containing all radio buttons other than |element| that
// have the same |name|, either in the form that |element| belongs to or,
// if no form, in the document tree to which |element| belongs.
//
// This implementation is based upon the HTML spec definition of a
// "radio button group":
// http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#radio-button-group
//
function getAssociatedRadioButtons(element) {
if (element.form) {
return filter(element.form.elements, function(el) {
return el != element &&
el.tagName == 'INPUT' &&
el.type == 'radio' &&
el.name == element.name;
});
} else {
var treeScope = getTreeScope(element);
if (!treeScope)
return [];
var radios = treeScope.querySelectorAll(
'input[type="radio"][name="' + element.name + '"]');
return filter(radios, function(el) {
return el != element && !el.form;
});
}
}
function checkedPostEvent(input) {
// Only the radio button that is getting checked gets an event. We
// therefore find all the associated radio buttons and update their
// check binding manually.
if (input.tagName === 'INPUT' &&
input.type === 'radio') {
getAssociatedRadioButtons(input).forEach(function(radio) {
var checkedBinding = radio.bindings_.checked;
if (checkedBinding) {
// Set the value directly to avoid an infinite call stack.
checkedBinding.observable_.setValue(false);
}
});
}
}
HTMLInputElement.prototype.bind = function(name, value, oneTime) {
if (name !== 'value' && name !== 'checked')
return HTMLElement.prototype.bind.call(this, name, value, oneTime);
this.removeAttribute(name);
var sanitizeFn = name == 'checked' ? booleanSanitize : sanitizeValue;
var postEventFn = name == 'checked' ? checkedPostEvent : noop;
if (oneTime)
return updateInput(this, name, value, sanitizeFn);
var observable = value;
var binding = bindInputEvent(this, name, observable, postEventFn);
updateInput(this, name,
observable.open(inputBinding(this, name, sanitizeFn)),
sanitizeFn);
// Checkboxes may need to update bindings of other checkboxes.
return updateBindings(this, name, binding);
}
HTMLTextAreaElement.prototype.bind = function(name, value, oneTime) {
if (name !== 'value')
return HTMLElement.prototype.bind.call(this, name, value, oneTime);
this.removeAttribute('value');
if (oneTime)
return updateInput(this, 'value', value);
var observable = value;
var binding = bindInputEvent(this, 'value', observable);
updateInput(this, 'value',
observable.open(inputBinding(this, 'value', sanitizeValue)));
return maybeUpdateBindings(this, name, binding);
}
function updateOption(option, value) {
var parentNode = option.parentNode;;
var select;
var selectBinding;
var oldValue;
if (parentNode instanceof HTMLSelectElement &&
parentNode.bindings_ &&
parentNode.bindings_.value) {
select = parentNode;
selectBinding = select.bindings_.value;
oldValue = select.value;
}
option.value = sanitizeValue(value);
if (select && select.value != oldValue) {
selectBinding.observable_.setValue(select.value);
selectBinding.observable_.discardChanges();
Platform.performMicrotaskCheckpoint();
}
}
function optionBinding(option) {
return function(value) {
updateOption(option, value);
}
}
HTMLOptionElement.prototype.bind = function(name, value, oneTime) {
if (name !== 'value')
return HTMLElement.prototype.bind.call(this, name, value, oneTime);
this.removeAttribute('value');
if (oneTime)
return updateOption(this, value);
var observable = value;
var binding = bindInputEvent(this, 'value', observable);
updateOption(this, observable.open(optionBinding(this)));
return maybeUpdateBindings(this, name, binding);
}
HTMLSelectElement.prototype.bind = function(name, value, oneTime) {
if (name === 'selectedindex')
name = 'selectedIndex';
if (name !== 'selectedIndex' && name !== 'value')
return HTMLElement.prototype.bind.call(this, name, value, oneTime);
this.removeAttribute(name);
if (oneTime)
return updateInput(this, name, value);
var observable = value;
var binding = bindInputEvent(this, name, observable);
updateInput(this, name,
observable.open(inputBinding(this, name)));
// Option update events may need to access select bindings.
return updateBindings(this, name, binding);
}
})(this);
// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
// Code distributed by Google as part of the polymer project is also
// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
(function(global) {
'use strict';
function assert(v) {
if (!v)
throw new Error('Assertion failed');
}
var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
function getFragmentRoot(node) {
var p;
while (p = node.parentNode) {
node = p;
}
return node;
}
function searchRefId(node, id) {
if (!id)
return;
var ref;
var selector = '#' + id;
while (!ref) {
node = getFragmentRoot(node);
if (node.protoContent_)
ref = node.protoContent_.querySelector(selector);
else if (node.getElementById)
ref = node.getElementById(id);
if (ref || !node.templateCreator_)
break
node = node.templateCreator_;
}
return ref;
}
function getInstanceRoot(node) {
while (node.parentNode) {
node = node.parentNode;
}
return node.templateCreator_ ? node : null;
}
var Map;
if (global.Map && typeof global.Map.prototype.forEach === 'function') {
Map = global.Map;
} else {
Map = function() {
this.keys = [];
this.values = [];
};
Map.prototype = {
set: function(key, value) {
var index = this.keys.indexOf(key);
if (index < 0) {
this.keys.push(key);
this.values.push(value);
} else {
this.values[index] = value;
}
},
get: function(key) {
var index = this.keys.indexOf(key);
if (index < 0)
return;
return this.values[index];
},
delete: function(key, value) {
var index = this.keys.indexOf(key);
if (index < 0)
return false;
this.keys.splice(index, 1);
this.values.splice(index, 1);
return true;
},
forEach: function(f, opt_this) {
for (var i = 0; i < this.keys.length; i++)
f.call(opt_this || this, this.values[i], this.keys[i], this);
}
};
}
// JScript does not have __proto__. We wrap all object literals with
// createObject which uses Object.create, Object.defineProperty and
// Object.getOwnPropertyDescriptor to create a new object that does the exact
// same thing. The main downside to this solution is that we have to extract
// all those property descriptors for IE.
var createObject = ('__proto__' in {}) ?
function(obj) { return obj; } :
function(obj) {
var proto = obj.__proto__;
if (!proto)
return obj;
var newObject = Object.create(proto);
Object.getOwnPropertyNames(obj).forEach(function(name) {
Object.defineProperty(newObject, name,
Object.getOwnPropertyDescriptor(obj, name));
});
return newObject;
};
// IE does not support have Document.prototype.contains.
if (typeof document.contains != 'function') {
Document.prototype.contains = function(node) {
if (node === this || node.parentNode === this)
return true;
return this.documentElement.contains(node);
}
}
var BIND = 'bind';
var REPEAT = 'repeat';
var IF = 'if';
var templateAttributeDirectives = {
'template': true,
'repeat': true,
'bind': true,
'ref': true
};
var semanticTemplateElements = {
'THEAD': true,
'TBODY': true,
'TFOOT': true,
'TH': true,
'TR': true,
'TD': true,
'COLGROUP': true,
'COL': true,
'CAPTION': true,
'OPTION': true,
'OPTGROUP': true
};
var hasTemplateElement = typeof HTMLTemplateElement !== 'undefined';
if (hasTemplateElement) {
// TODO(rafaelw): Remove when fix for
// https://codereview.chromium.org/164803002/
// makes it to Chrome release.
(function() {
var t = document.createElement('template');
var d = t.content.ownerDocument;
var html = d.appendChild(d.createElement('html'));
var head = html.appendChild(d.createElement('head'));
var base = d.createElement('base');
base.href = document.baseURI;
head.appendChild(base);
})();
}
var allTemplatesSelectors = 'template, ' +
Object.keys(semanticTemplateElements).map(function(tagName) {
return tagName.toLowerCase() + '[template]';
}).join(', ');
function isSVGTemplate(el) {
return el.tagName == 'template' &&
el.namespaceURI == 'http://www.w3.org/2000/svg';
}
function isHTMLTemplate(el) {
return el.tagName == 'TEMPLATE' &&
el.namespaceURI == 'http://www.w3.org/1999/xhtml';
}
function isAttributeTemplate(el) {
return Boolean(semanticTemplateElements[el.tagName] &&
el.hasAttribute('template'));
}
function isTemplate(el) {
if (el.isTemplate_ === undefined)
el.isTemplate_ = el.tagName == 'TEMPLATE' || isAttributeTemplate(el);
return el.isTemplate_;
}
// FIXME: Observe templates being added/removed from documents
// FIXME: Expose imperative API to decorate and observe templates in
// "disconnected tress" (e.g. ShadowRoot)
document.addEventListener('DOMContentLoaded', function(e) {
bootstrapTemplatesRecursivelyFrom(document);
// FIXME: Is this needed? Seems like it shouldn't be.
Platform.performMicrotaskCheckpoint();
}, false);
function forAllTemplatesFrom(node, fn) {
var subTemplates = node.querySelectorAll(allTemplatesSelectors);
if (isTemplate(node))
fn(node)
forEach(subTemplates, fn);
}
function bootstrapTemplatesRecursivelyFrom(node) {
function bootstrap(template) {
if (!HTMLTemplateElement.decorate(template))
bootstrapTemplatesRecursivelyFrom(template.content);
}
forAllTemplatesFrom(node, bootstrap);
}
if (!hasTemplateElement) {
/**
* This represents a element.
* @constructor
* @extends {HTMLElement}
*/
global.HTMLTemplateElement = function() {
throw TypeError('Illegal constructor');
};
}
var hasProto = '__proto__' in {};
function mixin(to, from) {
Object.getOwnPropertyNames(from).forEach(function(name) {
Object.defineProperty(to, name,
Object.getOwnPropertyDescriptor(from, name));
});
}
// http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
function getOrCreateTemplateContentsOwner(template) {
var doc = template.ownerDocument
if (!doc.defaultView)
return doc;
var d = doc.templateContentsOwner_;
if (!d) {
// TODO(arv): This should either be a Document or HTMLDocument depending
// on doc.
d = doc.implementation.createHTMLDocument('');
while (d.lastChild) {
d.removeChild(d.lastChild);
}
doc.templateContentsOwner_ = d;
}
return d;
}
function getTemplateStagingDocument(template) {
if (!template.stagingDocument_) {
var owner = template.ownerDocument;
if (!owner.stagingDocument_) {
owner.stagingDocument_ = owner.implementation.createHTMLDocument('');
owner.stagingDocument_.isStagingDocument = true;
// TODO(rafaelw): Remove when fix for
// https://codereview.chromium.org/164803002/
// makes it to Chrome release.
var base = owner.stagingDocument_.createElement('base');
base.href = document.baseURI;
owner.stagingDocument_.head.appendChild(base);
owner.stagingDocument_.stagingDocument_ = owner.stagingDocument_;
}
template.stagingDocument_ = owner.stagingDocument_;
}
return template.stagingDocument_;
}
// For non-template browsers, the parser will disallow in certain
// locations, so we allow "attribute templates" which combine the template
// element with the top-level container node of the content, e.g.
//
// Bar
// + #document-fragment
// +
// + Bar
//
function extractTemplateFromAttributeTemplate(el) {
var template = el.ownerDocument.createElement('template');
el.parentNode.insertBefore(template, el);
var attribs = el.attributes;
var count = attribs.length;
while (count-- > 0) {
var attrib = attribs[count];
if (templateAttributeDirectives[attrib.name]) {
if (attrib.name !== 'template')
template.setAttribute(attrib.name, attrib.value);
el.removeAttribute(attrib.name);
}
}
return template;
}
function extractTemplateFromSVGTemplate(el) {
var template = el.ownerDocument.createElement('template');
el.parentNode.insertBefore(template, el);
var attribs = el.attributes;
var count = attribs.length;
while (count-- > 0) {
var attrib = attribs[count];
template.setAttribute(attrib.name, attrib.value);
el.removeAttribute(attrib.name);
}
el.parentNode.removeChild(el);
return template;
}
function liftNonNativeTemplateChildrenIntoContent(template, el, useRoot) {
var content = template.content;
if (useRoot) {
content.appendChild(el);
return;
}
var child;
while (child = el.firstChild) {
content.appendChild(child);
}
}
var templateObserver;
if (typeof MutationObserver == 'function') {
templateObserver = new MutationObserver(function(records) {
for (var i = 0; i < records.length; i++) {
records[i].target.refChanged_();
}
});
}
/**
* Ensures proper API and content model for template elements.
* @param {HTMLTemplateElement} opt_instanceRef The template element which
* |el| template element will return as the value of its ref(), and whose
* content will be used as source when createInstance() is invoked.
*/
HTMLTemplateElement.decorate = function(el, opt_instanceRef) {
if (el.templateIsDecorated_)
return false;
var templateElement = el;
templateElement.templateIsDecorated_ = true;
var isNativeHTMLTemplate = isHTMLTemplate(templateElement) &&
hasTemplateElement;
var bootstrapContents = isNativeHTMLTemplate;
var liftContents = !isNativeHTMLTemplate;
var liftRoot = false;
if (!isNativeHTMLTemplate) {
if (isAttributeTemplate(templateElement)) {
assert(!opt_instanceRef);
templateElement = extractTemplateFromAttributeTemplate(el);
templateElement.templateIsDecorated_ = true;
isNativeHTMLTemplate = hasTemplateElement;
liftRoot = true;
} else if (isSVGTemplate(templateElement)) {
templateElement = extractTemplateFromSVGTemplate(el);
templateElement.templateIsDecorated_ = true;
isNativeHTMLTemplate = hasTemplateElement;
}
}
if (!isNativeHTMLTemplate) {
fixTemplateElementPrototype(templateElement);
var doc = getOrCreateTemplateContentsOwner(templateElement);
templateElement.content_ = doc.createDocumentFragment();
}
if (opt_instanceRef) {
// template is contained within an instance, its direct content must be
// empty
templateElement.instanceRef_ = opt_instanceRef;
} else if (liftContents) {
liftNonNativeTemplateChildrenIntoContent(templateElement,
el,
liftRoot);
} else if (bootstrapContents) {
bootstrapTemplatesRecursivelyFrom(templateElement.content);
}
return true;
};
// TODO(rafaelw): This used to decorate recursively all templates from a given
// node. This happens by default on 'DOMContentLoaded', but may be needed
// in subtrees not descendent from document (e.g. ShadowRoot).
// Review whether this is the right public API.
HTMLTemplateElement.bootstrap = bootstrapTemplatesRecursivelyFrom;
var htmlElement = global.HTMLUnknownElement || HTMLElement;
var contentDescriptor = {
get: function() {
return this.content_;
},
enumerable: true,
configurable: true
};
if (!hasTemplateElement) {
// Gecko is more picky with the prototype than WebKit. Make sure to use the
// same prototype as created in the constructor.
HTMLTemplateElement.prototype = Object.create(htmlElement.prototype);
Object.defineProperty(HTMLTemplateElement.prototype, 'content',
contentDescriptor);
}
function fixTemplateElementPrototype(el) {
if (hasProto)
el.__proto__ = HTMLTemplateElement.prototype;
else
mixin(el, HTMLTemplateElement.prototype);
}
function ensureSetModelScheduled(template) {
if (!template.setModelFn_) {
template.setModelFn_ = function() {
template.setModelFnScheduled_ = false;
var map = getBindings(template,
template.delegate_ && template.delegate_.prepareBinding);
processBindings(template, map, template.model_);
};
}
if (!template.setModelFnScheduled_) {
template.setModelFnScheduled_ = true;
Observer.runEOM_(template.setModelFn_);
}
}
mixin(HTMLTemplateElement.prototype, {
bind: function(name, value, oneTime) {
if (name != 'ref')
return Element.prototype.bind.call(this, name, value, oneTime);
var self = this;
var ref = oneTime ? value : value.open(function(ref) {
self.setAttribute('ref', ref);
self.refChanged_();
});
this.setAttribute('ref', ref);
this.refChanged_();
if (oneTime)
return;
if (!this.bindings_) {
this.bindings_ = { ref: value };
} else {
this.bindings_.ref = value;
}
return value;
},
processBindingDirectives_: function(directives) {
if (this.iterator_)
this.iterator_.closeDeps();
if (!directives.if && !directives.bind && !directives.repeat) {
if (this.iterator_) {
this.iterator_.close();
this.iterator_ = undefined;
}
return;
}
if (!this.iterator_) {
this.iterator_ = new TemplateIterator(this);
}
this.iterator_.updateDependencies(directives, this.model_);
if (templateObserver) {
templateObserver.observe(this, { attributes: true,
attributeFilter: ['ref'] });
}
return this.iterator_;
},
createInstance: function(model, bindingDelegate, delegate_) {
if (bindingDelegate)
delegate_ = this.newDelegate_(bindingDelegate);
else if (!delegate_)
delegate_ = this.delegate_;
if (!this.refContent_)
this.refContent_ = this.ref_.content;
var content = this.refContent_;
if (content.firstChild === null)
return emptyInstance;
var map = getInstanceBindingMap(content, delegate_);
var stagingDocument = getTemplateStagingDocument(this);
var instance = stagingDocument.createDocumentFragment();
instance.templateCreator_ = this;
instance.protoContent_ = content;
instance.bindings_ = [];
instance.terminator_ = null;
var instanceRecord = instance.templateInstance_ = {
firstNode: null,
lastNode: null,
model: model
};
var i = 0;
var collectTerminator = false;
for (var child = content.firstChild; child; child = child.nextSibling) {
// The terminator of the instance is the clone of the last child of the
// content. If the last child is an active template, it may produce
// instances as a result of production, so simply collecting the last
// child of the instance after it has finished producing may be wrong.
if (child.nextSibling === null)
collectTerminator = true;
var clone = cloneAndBindInstance(child, instance, stagingDocument,
map.children[i++],
model,
delegate_,
instance.bindings_);
clone.templateInstance_ = instanceRecord;
if (collectTerminator)
instance.terminator_ = clone;
}
instanceRecord.firstNode = instance.firstChild;
instanceRecord.lastNode = instance.lastChild;
instance.templateCreator_ = undefined;
instance.protoContent_ = undefined;
return instance;
},
get model() {
return this.model_;
},
set model(model) {
this.model_ = model;
ensureSetModelScheduled(this);
},
get bindingDelegate() {
return this.delegate_ && this.delegate_.raw;
},
refChanged_: function() {
if (!this.iterator_ || this.refContent_ === this.ref_.content)
return;
this.refContent_ = undefined;
this.iterator_.valueChanged();
this.iterator_.updateIteratedValue(this.iterator_.getUpdatedValue());
},
clear: function() {
this.model_ = undefined;
this.delegate_ = undefined;
if (this.bindings_ && this.bindings_.ref)
this.bindings_.ref.close()
this.refContent_ = undefined;
if (!this.iterator_)
return;
this.iterator_.valueChanged();
this.iterator_.close()
this.iterator_ = undefined;
},
setDelegate_: function(delegate) {
this.delegate_ = delegate;
this.bindingMap_ = undefined;
if (this.iterator_) {
this.iterator_.instancePositionChangedFn_ = undefined;
this.iterator_.instanceModelFn_ = undefined;
}
},
newDelegate_: function(bindingDelegate) {
if (!bindingDelegate)
return;
function delegateFn(name) {
var fn = bindingDelegate && bindingDelegate[name];
if (typeof fn != 'function')
return;
return function() {
return fn.apply(bindingDelegate, arguments);
};
}
return {
bindingMaps: {},
raw: bindingDelegate,
prepareBinding: delegateFn('prepareBinding'),
prepareInstanceModel: delegateFn('prepareInstanceModel'),
prepareInstancePositionChanged:
delegateFn('prepareInstancePositionChanged')
};
},
set bindingDelegate(bindingDelegate) {
if (this.delegate_) {
throw Error('Template must be cleared before a new bindingDelegate ' +
'can be assigned');
}
this.setDelegate_(this.newDelegate_(bindingDelegate));
},
get ref_() {
var ref = searchRefId(this, this.getAttribute('ref'));
if (!ref)
ref = this.instanceRef_;
if (!ref)
return this;
var nextRef = ref.ref_;
return nextRef ? nextRef : ref;
}
});
// Returns
// a) undefined if there are no mustaches.
// b) [TEXT, (ONE_TIME?, PATH, DELEGATE_FN, TEXT)+] if there is at least one mustache.
function parseMustaches(s, name, node, prepareBindingFn) {
if (!s || !s.length)
return;
var tokens;
var length = s.length;
var startIndex = 0, lastIndex = 0, endIndex = 0;
var onlyOneTime = true;
while (lastIndex < length) {
var startIndex = s.indexOf('{{', lastIndex);
var oneTimeStart = s.indexOf('[[', lastIndex);
var oneTime = false;
var terminator = '}}';
if (oneTimeStart >= 0 &&
(startIndex < 0 || oneTimeStart < startIndex)) {
startIndex = oneTimeStart;
oneTime = true;
terminator = ']]';
}
endIndex = startIndex < 0 ? -1 : s.indexOf(terminator, startIndex + 2);
if (endIndex < 0) {
if (!tokens)
return;
tokens.push(s.slice(lastIndex)); // TEXT
break;
}
tokens = tokens || [];
tokens.push(s.slice(lastIndex, startIndex)); // TEXT
var pathString = s.slice(startIndex + 2, endIndex).trim();
tokens.push(oneTime); // ONE_TIME?
onlyOneTime = onlyOneTime && oneTime;
var delegateFn = prepareBindingFn &&
prepareBindingFn(pathString, name, node);
// Don't try to parse the expression if there's a prepareBinding function
if (delegateFn == null) {
tokens.push(Path.get(pathString)); // PATH
} else {
tokens.push(null);
}
tokens.push(delegateFn); // DELEGATE_FN
lastIndex = endIndex + 2;
}
if (lastIndex === length)
tokens.push(''); // TEXT
tokens.hasOnePath = tokens.length === 5;
tokens.isSimplePath = tokens.hasOnePath &&
tokens[0] == '' &&
tokens[4] == '';
tokens.onlyOneTime = onlyOneTime;
tokens.combinator = function(values) {
var newValue = tokens[0];
for (var i = 1; i < tokens.length; i += 4) {
var value = tokens.hasOnePath ? values : values[(i - 1) / 4];
if (value !== undefined)
newValue += value;
newValue += tokens[i + 3];
}
return newValue;
}
return tokens;
};
function processOneTimeBinding(name, tokens, node, model) {
if (tokens.hasOnePath) {
var delegateFn = tokens[3];
var value = delegateFn ? delegateFn(model, node, true) :
tokens[2].getValueFrom(model);
return tokens.isSimplePath ? value : tokens.combinator(value);
}
var values = [];
for (var i = 1; i < tokens.length; i += 4) {
var delegateFn = tokens[i + 2];
values[(i - 1) / 4] = delegateFn ? delegateFn(model, node) :
tokens[i + 1].getValueFrom(model);
}
return tokens.combinator(values);
}
function processSinglePathBinding(name, tokens, node, model) {
var delegateFn = tokens[3];
var observer = delegateFn ? delegateFn(model, node, false) :
new PathObserver(model, tokens[2]);
return tokens.isSimplePath ? observer :
new ObserverTransform(observer, tokens.combinator);
}
function processBinding(name, tokens, node, model) {
if (tokens.onlyOneTime)
return processOneTimeBinding(name, tokens, node, model);
if (tokens.hasOnePath)
return processSinglePathBinding(name, tokens, node, model);
var observer = new CompoundObserver();
for (var i = 1; i < tokens.length; i += 4) {
var oneTime = tokens[i];
var delegateFn = tokens[i + 2];
if (delegateFn) {
var value = delegateFn(model, node, oneTime);
if (oneTime)
observer.addPath(value)
else
observer.addObserver(value);
continue;
}
var path = tokens[i + 1];
if (oneTime)
observer.addPath(path.getValueFrom(model))
else
observer.addPath(model, path);
}
return new ObserverTransform(observer, tokens.combinator);
}
function processBindings(node, bindings, model, instanceBindings) {
for (var i = 0; i < bindings.length; i += 2) {
var name = bindings[i]
var tokens = bindings[i + 1];
var value = processBinding(name, tokens, node, model);
var binding = node.bind(name, value, tokens.onlyOneTime);
if (binding && instanceBindings)
instanceBindings.push(binding);
}
node.bindFinished();
if (!bindings.isTemplate)
return;
node.model_ = model;
var iter = node.processBindingDirectives_(bindings);
if (instanceBindings && iter)
instanceBindings.push(iter);
}
function parseWithDefault(el, name, prepareBindingFn) {
var v = el.getAttribute(name);
return parseMustaches(v == '' ? '{{}}' : v, name, el, prepareBindingFn);
}
function parseAttributeBindings(element, prepareBindingFn) {
assert(element);
var bindings = [];
var ifFound = false;
var bindFound = false;
for (var i = 0; i < element.attributes.length; i++) {
var attr = element.attributes[i];
var name = attr.name;
var value = attr.value;
// Allow bindings expressed in attributes to be prefixed with underbars.
// We do this to allow correct semantics for browsers that don't implement
// where certain attributes might trigger side-effects -- and
// for IE which sanitizes certain attributes, disallowing mustache
// replacements in their text.
while (name[0] === '_') {
name = name.substring(1);
}
if (isTemplate(element) &&
(name === IF || name === BIND || name === REPEAT)) {
continue;
}
var tokens = parseMustaches(value, name, element,
prepareBindingFn);
if (!tokens)
continue;
bindings.push(name, tokens);
}
if (isTemplate(element)) {
bindings.isTemplate = true;
bindings.if = parseWithDefault(element, IF, prepareBindingFn);
bindings.bind = parseWithDefault(element, BIND, prepareBindingFn);
bindings.repeat = parseWithDefault(element, REPEAT, prepareBindingFn);
if (bindings.if && !bindings.bind && !bindings.repeat)
bindings.bind = parseMustaches('{{}}', BIND, element, prepareBindingFn);
}
return bindings;
}
function getBindings(node, prepareBindingFn) {
if (node.nodeType === Node.ELEMENT_NODE)
return parseAttributeBindings(node, prepareBindingFn);
if (node.nodeType === Node.TEXT_NODE) {
var tokens = parseMustaches(node.data, 'textContent', node,
prepareBindingFn);
if (tokens)
return ['textContent', tokens];
}
return [];
}
function cloneAndBindInstance(node, parent, stagingDocument, bindings, model,
delegate,
instanceBindings,
instanceRecord) {
var clone = parent.appendChild(stagingDocument.importNode(node, false));
var i = 0;
for (var child = node.firstChild; child; child = child.nextSibling) {
cloneAndBindInstance(child, clone, stagingDocument,
bindings.children[i++],
model,
delegate,
instanceBindings);
}
if (bindings.isTemplate) {
HTMLTemplateElement.decorate(clone, node);
if (delegate)
clone.setDelegate_(delegate);
}
processBindings(clone, bindings, model, instanceBindings);
return clone;
}
function createInstanceBindingMap(node, prepareBindingFn) {
var map = getBindings(node, prepareBindingFn);
map.children = {};
var index = 0;
for (var child = node.firstChild; child; child = child.nextSibling) {
map.children[index++] = createInstanceBindingMap(child, prepareBindingFn);
}
return map;
}
var contentUidCounter = 1;
// TODO(rafaelw): Setup a MutationObserver on content which clears the id
// so that bindingMaps regenerate when the template.content changes.
function getContentUid(content) {
var id = content.id_;
if (!id)
id = content.id_ = contentUidCounter++;
return id;
}
// Each delegate is associated with a set of bindingMaps, one for each
// content which may be used by a template. The intent is that each binding
// delegate gets the opportunity to prepare the instance (via the prepare*
// delegate calls) once across all uses.
// TODO(rafaelw): Separate out the parse map from the binding map. In the
// current implementation, if two delegates need a binding map for the same
// content, the second will have to reparse.
function getInstanceBindingMap(content, delegate_) {
var contentId = getContentUid(content);
if (delegate_) {
var map = delegate_.bindingMaps[contentId];
if (!map) {
map = delegate_.bindingMaps[contentId] =
createInstanceBindingMap(content, delegate_.prepareBinding) || [];
}
return map;
}
var map = content.bindingMap_;
if (!map) {
map = content.bindingMap_ =
createInstanceBindingMap(content, undefined) || [];
}
return map;
}
Object.defineProperty(Node.prototype, 'templateInstance', {
get: function() {
var instance = this.templateInstance_;
return instance ? instance :
(this.parentNode ? this.parentNode.templateInstance : undefined);
}
});
var emptyInstance = document.createDocumentFragment();
emptyInstance.bindings_ = [];
emptyInstance.terminator_ = null;
function TemplateIterator(templateElement) {
this.closed = false;
this.templateElement_ = templateElement;
this.instances = [];
this.deps = undefined;
this.iteratedValue = [];
this.presentValue = undefined;
this.arrayObserver = undefined;
}
TemplateIterator.prototype = {
closeDeps: function() {
var deps = this.deps;
if (deps) {
if (deps.ifOneTime === false)
deps.ifValue.close();
if (deps.oneTime === false)
deps.value.close();
}
},
updateDependencies: function(directives, model) {
this.closeDeps();
var deps = this.deps = {};
var template = this.templateElement_;
var ifValue = true;
if (directives.if) {
deps.hasIf = true;
deps.ifOneTime = directives.if.onlyOneTime;
deps.ifValue = processBinding(IF, directives.if, template, model);
ifValue = deps.ifValue;
// oneTime if & predicate is false. nothing else to do.
if (deps.ifOneTime && !ifValue) {
this.valueChanged();
return;
}
if (!deps.ifOneTime)
ifValue = ifValue.open(this.updateIfValue, this);
}
if (directives.repeat) {
deps.repeat = true;
deps.oneTime = directives.repeat.onlyOneTime;
deps.value = processBinding(REPEAT, directives.repeat, template, model);
} else {
deps.repeat = false;
deps.oneTime = directives.bind.onlyOneTime;
deps.value = processBinding(BIND, directives.bind, template, model);
}
var value = deps.value;
if (!deps.oneTime)
value = value.open(this.updateIteratedValue, this);
if (!ifValue) {
this.valueChanged();
return;
}
this.updateValue(value);
},
/**
* Gets the updated value of the bind/repeat. This can potentially call
* user code (if a bindingDelegate is set up) so we try to avoid it if we
* already have the value in hand (from Observer.open).
*/
getUpdatedValue: function() {
var value = this.deps.value;
if (!this.deps.oneTime)
value = value.discardChanges();
return value;
},
updateIfValue: function(ifValue) {
if (!ifValue) {
this.valueChanged();
return;
}
this.updateValue(this.getUpdatedValue());
},
updateIteratedValue: function(value) {
if (this.deps.hasIf) {
var ifValue = this.deps.ifValue;
if (!this.deps.ifOneTime)
ifValue = ifValue.discardChanges();
if (!ifValue) {
this.valueChanged();
return;
}
}
this.updateValue(value);
},
updateValue: function(value) {
if (!this.deps.repeat)
value = [value];
var observe = this.deps.repeat &&
!this.deps.oneTime &&
Array.isArray(value);
this.valueChanged(value, observe);
},
valueChanged: function(value, observeValue) {
if (!Array.isArray(value))
value = [];
if (value === this.iteratedValue)
return;
this.unobserve();
this.presentValue = value;
if (observeValue) {
this.arrayObserver = new ArrayObserver(this.presentValue);
this.arrayObserver.open(this.handleSplices, this);
}
this.handleSplices(ArrayObserver.calculateSplices(this.presentValue,
this.iteratedValue));
},
getLastInstanceNode: function(index) {
if (index == -1)
return this.templateElement_;
var instance = this.instances[index];
var terminator = instance.terminator_;
if (!terminator)
return this.getLastInstanceNode(index - 1);
if (terminator.nodeType !== Node.ELEMENT_NODE ||
this.templateElement_ === terminator) {
return terminator;
}
var subtemplateIterator = terminator.iterator_;
if (!subtemplateIterator)
return terminator;
return subtemplateIterator.getLastTemplateNode();
},
getLastTemplateNode: function() {
return this.getLastInstanceNode(this.instances.length - 1);
},
insertInstanceAt: function(index, fragment) {
var previousInstanceLast = this.getLastInstanceNode(index - 1);
var parent = this.templateElement_.parentNode;
this.instances.splice(index, 0, fragment);
parent.insertBefore(fragment, previousInstanceLast.nextSibling);
},
extractInstanceAt: function(index) {
var previousInstanceLast = this.getLastInstanceNode(index - 1);
var lastNode = this.getLastInstanceNode(index);
var parent = this.templateElement_.parentNode;
var instance = this.instances.splice(index, 1)[0];
while (lastNode !== previousInstanceLast) {
var node = previousInstanceLast.nextSibling;
if (node == lastNode)
lastNode = previousInstanceLast;
instance.appendChild(parent.removeChild(node));
}
return instance;
},
getDelegateFn: function(fn) {
fn = fn && fn(this.templateElement_);
return typeof fn === 'function' ? fn : null;
},
handleSplices: function(splices) {
if (this.closed || !splices.length)
return;
var template = this.templateElement_;
if (!template.parentNode) {
this.close();
return;
}
ArrayObserver.applySplices(this.iteratedValue, this.presentValue,
splices);
var delegate = template.delegate_;
if (this.instanceModelFn_ === undefined) {
this.instanceModelFn_ =
this.getDelegateFn(delegate && delegate.prepareInstanceModel);
}
if (this.instancePositionChangedFn_ === undefined) {
this.instancePositionChangedFn_ =
this.getDelegateFn(delegate &&
delegate.prepareInstancePositionChanged);
}
// Instance Removals
var instanceCache = new Map;
var removeDelta = 0;
for (var i = 0; i < splices.length; i++) {
var splice = splices[i];
var removed = splice.removed;
for (var j = 0; j < removed.length; j++) {
var model = removed[j];
var instance = this.extractInstanceAt(splice.index + removeDelta);
if (instance !== emptyInstance) {
instanceCache.set(model, instance);
}
}
removeDelta -= splice.addedCount;
}
// Instance Insertions
for (var i = 0; i < splices.length; i++) {
var splice = splices[i];
var addIndex = splice.index;
for (; addIndex < splice.index + splice.addedCount; addIndex++) {
var model = this.iteratedValue[addIndex];
var instance = instanceCache.get(model);
if (instance) {
instanceCache.delete(model);
} else {
if (this.instanceModelFn_) {
model = this.instanceModelFn_(model);
}
if (model === undefined) {
instance = emptyInstance;
} else {
instance = template.createInstance(model, undefined, delegate);
}
}
this.insertInstanceAt(addIndex, instance);
}
}
instanceCache.forEach(function(instance) {
this.closeInstanceBindings(instance);
}, this);
if (this.instancePositionChangedFn_)
this.reportInstancesMoved(splices);
},
reportInstanceMoved: function(index) {
var instance = this.instances[index];
if (instance === emptyInstance)
return;
this.instancePositionChangedFn_(instance.templateInstance_, index);
},
reportInstancesMoved: function(splices) {
var index = 0;
var offset = 0;
for (var i = 0; i < splices.length; i++) {
var splice = splices[i];
if (offset != 0) {
while (index < splice.index) {
this.reportInstanceMoved(index);
index++;
}
} else {
index = splice.index;
}
while (index < splice.index + splice.addedCount) {
this.reportInstanceMoved(index);
index++;
}
offset += splice.addedCount - splice.removed.length;
}
if (offset == 0)
return;
var length = this.instances.length;
while (index < length) {
this.reportInstanceMoved(index);
index++;
}
},
closeInstanceBindings: function(instance) {
var bindings = instance.bindings_;
for (var i = 0; i < bindings.length; i++) {
bindings[i].close();
}
},
unobserve: function() {
if (!this.arrayObserver)
return;
this.arrayObserver.close();
this.arrayObserver = undefined;
},
close: function() {
if (this.closed)
return;
this.unobserve();
for (var i = 0; i < this.instances.length; i++) {
this.closeInstanceBindings(this.instances[i]);
}
this.instances.length = 0;
this.closeDeps();
this.templateElement_.iterator_ = undefined;
this.closed = true;
}
};
// Polyfill-specific API.
HTMLTemplateElement.forAllTemplatesFrom_ = forAllTemplatesFrom;
})(this);
(function(scope) {
'use strict';
// feature detect for URL constructor
var hasWorkingUrl = false;
if (!scope.forceJURL) {
try {
var u = new URL('b', 'http://a');
hasWorkingUrl = u.href === 'http://a/b';
} catch(e) {}
}
if (hasWorkingUrl)
return;
var relative = Object.create(null);
relative['ftp'] = 21;
relative['file'] = 0;
relative['gopher'] = 70;
relative['http'] = 80;
relative['https'] = 443;
relative['ws'] = 80;
relative['wss'] = 443;
var relativePathDotMapping = Object.create(null);
relativePathDotMapping['%2e'] = '.';
relativePathDotMapping['.%2e'] = '..';
relativePathDotMapping['%2e.'] = '..';
relativePathDotMapping['%2e%2e'] = '..';
function isRelativeScheme(scheme) {
return relative[scheme] !== undefined;
}
function invalid() {
clear.call(this);
this._isInvalid = true;
}
function IDNAToASCII(h) {
if ('' == h) {
invalid.call(this)
}
// XXX
return h.toLowerCase()
}
function percentEscape(c) {
var unicode = c.charCodeAt(0);
if (unicode > 0x20 &&
unicode < 0x7F &&
// " # < > ? `
[0x22, 0x23, 0x3C, 0x3E, 0x3F, 0x60].indexOf(unicode) == -1
) {
return c;
}
return encodeURIComponent(c);
}
function percentEscapeQuery(c) {
// XXX This actually needs to encode c using encoding and then
// convert the bytes one-by-one.
var unicode = c.charCodeAt(0);
if (unicode > 0x20 &&
unicode < 0x7F &&
// " # < > ` (do not escape '?')
[0x22, 0x23, 0x3C, 0x3E, 0x60].indexOf(unicode) == -1
) {
return c;
}
return encodeURIComponent(c);
}
var EOF = undefined,
ALPHA = /[a-zA-Z]/,
ALPHANUMERIC = /[a-zA-Z0-9\+\-\.]/;
function parse(input, stateOverride, base) {
function err(message) {
errors.push(message)
}
var state = stateOverride || 'scheme start',
cursor = 0,
buffer = '',
seenAt = false,
seenBracket = false,
errors = [];
loop: while ((input[cursor - 1] != EOF || cursor == 0) && !this._isInvalid) {
var c = input[cursor];
switch (state) {
case 'scheme start':
if (c && ALPHA.test(c)) {
buffer += c.toLowerCase(); // ASCII-safe
state = 'scheme';
} else if (!stateOverride) {
buffer = '';
state = 'no scheme';
continue;
} else {
err('Invalid scheme.');
break loop;
}
break;
case 'scheme':
if (c && ALPHANUMERIC.test(c)) {
buffer += c.toLowerCase(); // ASCII-safe
} else if (':' == c) {
this._scheme = buffer;
buffer = '';
if (stateOverride) {
break loop;
}
if (isRelativeScheme(this._scheme)) {
this._isRelative = true;
}
if ('file' == this._scheme) {
state = 'relative';
} else if (this._isRelative && base && base._scheme == this._scheme) {
state = 'relative or authority';
} else if (this._isRelative) {
state = 'authority first slash';
} else {
state = 'scheme data';
}
} else if (!stateOverride) {
buffer = '';
cursor = 0;
state = 'no scheme';
continue;
} else if (EOF == c) {
break loop;
} else {
err('Code point not allowed in scheme: ' + c)
break loop;
}
break;
case 'scheme data':
if ('?' == c) {
query = '?';
state = 'query';
} else if ('#' == c) {
this._fragment = '#';
state = 'fragment';
} else {
// XXX error handling
if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._schemeData += percentEscape(c);
}
}
break;
case 'no scheme':
if (!base || !(isRelativeScheme(base._scheme))) {
err('Missing scheme.');
invalid.call(this);
} else {
state = 'relative';
continue;
}
break;
case 'relative or authority':
if ('/' == c && '/' == input[cursor+1]) {
state = 'authority ignore slashes';
} else {
err('Expected /, got: ' + c);
state = 'relative';
continue
}
break;
case 'relative':
this._isRelative = true;
if ('file' != this._scheme)
this._scheme = base._scheme;
if (EOF == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = base._query;
break loop;
} else if ('/' == c || '\\' == c) {
if ('\\' == c)
err('\\ is an invalid code point.');
state = 'relative slash';
} else if ('?' == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = '?';
state = 'query';
} else if ('#' == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = base._query;
this._fragment = '#';
state = 'fragment';
} else {
var nextC = input[cursor+1]
var nextNextC = input[cursor+2]
if (
'file' != this._scheme || !ALPHA.test(c) ||
(nextC != ':' && nextC != '|') ||
(EOF != nextNextC && '/' != nextNextC && '\\' != nextNextC && '?' != nextNextC && '#' != nextNextC)) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._path.pop();
}
state = 'relative path';
continue;
}
break;
case 'relative slash':
if ('/' == c || '\\' == c) {
if ('\\' == c) {
err('\\ is an invalid code point.');
}
if ('file' == this._scheme) {
state = 'file host';
} else {
state = 'authority ignore slashes';
}
} else {
if ('file' != this._scheme) {
this._host = base._host;
this._port = base._port;
}
state = 'relative path';
continue;
}
break;
case 'authority first slash':
if ('/' == c) {
state = 'authority second slash';
} else {
err("Expected '/', got: " + c);
state = 'authority ignore slashes';
continue;
}
break;
case 'authority second slash':
state = 'authority ignore slashes';
if ('/' != c) {
err("Expected '/', got: " + c);
continue;
}
break;
case 'authority ignore slashes':
if ('/' != c && '\\' != c) {
state = 'authority';
continue;
} else {
err('Expected authority, got: ' + c);
}
break;
case 'authority':
if ('@' == c) {
if (seenAt) {
err('@ already seen.');
buffer += '%40';
}
seenAt = true;
for (var i = 0; i < buffer.length; i++) {
var cp = buffer[i];
if ('\t' == cp || '\n' == cp || '\r' == cp) {
err('Invalid whitespace in authority.');
continue;
}
// XXX check URL code points
if (':' == cp && null === this._password) {
this._password = '';
continue;
}
var tempC = percentEscape(cp);
(null !== this._password) ? this._password += tempC : this._username += tempC;
}
buffer = '';
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
cursor -= buffer.length;
buffer = '';
state = 'host';
continue;
} else {
buffer += c;
}
break;
case 'file host':
if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
if (buffer.length == 2 && ALPHA.test(buffer[0]) && (buffer[1] == ':' || buffer[1] == '|')) {
state = 'relative path';
} else if (buffer.length == 0) {
state = 'relative path start';
} else {
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'relative path start';
}
continue;
} else if ('\t' == c || '\n' == c || '\r' == c) {
err('Invalid whitespace in file host.');
} else {
buffer += c;
}
break;
case 'host':
case 'hostname':
if (':' == c && !seenBracket) {
// XXX host parsing
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'port';
if ('hostname' == stateOverride) {
break loop;
}
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'relative path start';
if (stateOverride) {
break loop;
}
continue;
} else if ('\t' != c && '\n' != c && '\r' != c) {
if ('[' == c) {
seenBracket = true;
} else if (']' == c) {
seenBracket = false;
}
buffer += c;
} else {
err('Invalid code point in host/hostname: ' + c);
}
break;
case 'port':
if (/[0-9]/.test(c)) {
buffer += c;
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c || stateOverride) {
if ('' != buffer) {
var temp = parseInt(buffer, 10);
if (temp != relative[this._scheme]) {
this._port = temp + '';
}
buffer = '';
}
if (stateOverride) {
break loop;
}
state = 'relative path start';
continue;
} else if ('\t' == c || '\n' == c || '\r' == c) {
err('Invalid code point in port: ' + c);
} else {
invalid.call(this);
}
break;
case 'relative path start':
if ('\\' == c)
err("'\\' not allowed in path.");
state = 'relative path';
if ('/' != c && '\\' != c) {
continue;
}
break;
case 'relative path':
if (EOF == c || '/' == c || '\\' == c || (!stateOverride && ('?' == c || '#' == c))) {
if ('\\' == c) {
err('\\ not allowed in relative path.');
}
var tmp;
if (tmp = relativePathDotMapping[buffer.toLowerCase()]) {
buffer = tmp;
}
if ('..' == buffer) {
this._path.pop();
if ('/' != c && '\\' != c) {
this._path.push('');
}
} else if ('.' == buffer && '/' != c && '\\' != c) {
this._path.push('');
} else if ('.' != buffer) {
if ('file' == this._scheme && this._path.length == 0 && buffer.length == 2 && ALPHA.test(buffer[0]) && buffer[1] == '|') {
buffer = buffer[0] + ':';
}
this._path.push(buffer);
}
buffer = '';
if ('?' == c) {
this._query = '?';
state = 'query';
} else if ('#' == c) {
this._fragment = '#';
state = 'fragment';
}
} else if ('\t' != c && '\n' != c && '\r' != c) {
buffer += percentEscape(c);
}
break;
case 'query':
if (!stateOverride && '#' == c) {
this._fragment = '#';
state = 'fragment';
} else if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._query += percentEscapeQuery(c);
}
break;
case 'fragment':
if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._fragment += c;
}
break;
}
cursor++;
}
}
function clear() {
this._scheme = '';
this._schemeData = '';
this._username = '';
this._password = null;
this._host = '';
this._port = '';
this._path = [];
this._query = '';
this._fragment = '';
this._isInvalid = false;
this._isRelative = false;
}
// Does not process domain names or IP addresses.
// Does not handle encoding for the query parameter.
function jURL(url, base /* , encoding */) {
if (base !== undefined && !(base instanceof jURL))
base = new jURL(String(base));
this._url = url;
clear.call(this);
var input = url.replace(/^[ \t\r\n\f]+|[ \t\r\n\f]+$/g, '');
// encoding = encoding || 'utf-8'
parse.call(this, input, null, base);
}
jURL.prototype = {
get href() {
if (this._isInvalid)
return this._url;
var authority = '';
if ('' != this._username || null != this._password) {
authority = this._username +
(null != this._password ? ':' + this._password : '') + '@';
}
return this.protocol +
(this._isRelative ? '//' + authority + this.host : '') +
this.pathname + this._query + this._fragment;
},
set href(href) {
clear.call(this);
parse.call(this, href);
},
get protocol() {
return this._scheme + ':';
},
set protocol(protocol) {
if (this._isInvalid)
return;
parse.call(this, protocol + ':', 'scheme start');
},
get host() {
return this._isInvalid ? '' : this._port ?
this._host + ':' + this._port : this._host;
},
set host(host) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, host, 'host');
},
get hostname() {
return this._host;
},
set hostname(hostname) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, hostname, 'hostname');
},
get port() {
return this._port;
},
set port(port) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, port, 'port');
},
get pathname() {
return this._isInvalid ? '' : this._isRelative ?
'/' + this._path.join('/') : this._schemeData;
},
set pathname(pathname) {
if (this._isInvalid || !this._isRelative)
return;
this._path = [];
parse.call(this, pathname, 'relative path start');
},
get search() {
return this._isInvalid || !this._query || '?' == this._query ?
'' : this._query;
},
set search(search) {
if (this._isInvalid || !this._isRelative)
return;
this._query = '?';
if ('?' == search[0])
search = search.slice(1);
parse.call(this, search, 'query');
},
get hash() {
return this._isInvalid || !this._fragment || '#' == this._fragment ?
'' : this._fragment;
},
set hash(hash) {
if (this._isInvalid)
return;
this._fragment = '#';
if ('#' == hash[0])
hash = hash.slice(1);
parse.call(this, hash, 'fragment');
},
get origin() {
var host;
if (this._isInvalid || !this._scheme) {
return '';
}
// javascript: Gecko returns String(""), WebKit/Blink String("null")
// Gecko throws error for "data://"
// data: Gecko returns "", Blink returns "data://", WebKit returns "null"
// Gecko returns String("") for file: mailto:
// WebKit/Blink returns String("SCHEME://") for file: mailto:
switch (this._scheme) {
case 'data':
case 'file':
case 'javascript':
case 'mailto':
return 'null';
}
host = this.host;
if (!host) {
return '';
}
return this._scheme + '://' + host;
}
};
// Copy over the static methods
var OriginalURL = scope.URL;
if (OriginalURL) {
jURL.createObjectURL = function(blob) {
// IE extension allows a second optional options argument.
// http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
};
jURL.revokeObjectURL = function(url) {
OriginalURL.revokeObjectURL(url);
};
}
scope.URL = jURL;
})(this);
(function(scope) {
var iterations = 0;
var callbacks = [];
var twiddle = document.createTextNode('');
function endOfMicrotask(callback) {
twiddle.textContent = iterations++;
callbacks.push(callback);
}
function atEndOfMicrotask() {
while (callbacks.length) {
callbacks.shift()();
}
}
new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask)
.observe(twiddle, {characterData: true})
;
// exports
scope.endOfMicrotask = endOfMicrotask;
// bc
Platform.endOfMicrotask = endOfMicrotask;
})(Polymer);
(function(scope) {
/**
* @class Polymer
*/
// imports
var endOfMicrotask = scope.endOfMicrotask;
// logging
var log = window.WebComponents ? WebComponents.flags.log : {};
// inject style sheet
var style = document.createElement('style');
style.textContent = 'template {display: none !important;} /* injected by platform.js */';
var head = document.querySelector('head');
head.insertBefore(style, head.firstChild);
/**
* Force any pending data changes to be observed before
* the next task. Data changes are processed asynchronously but are guaranteed
* to be processed, for example, before paintin. This method should rarely be
* needed. It does nothing when Object.observe is available;
* when Object.observe is not available, Polymer automatically flushes data
* changes approximately every 1/10 second.
* Therefore, `flush` should only be used when a data mutation should be
* observed sooner than this.
*
* @method flush
*/
// flush (with logging)
var flushing;
function flush() {
if (!flushing) {
flushing = true;
endOfMicrotask(function() {
flushing = false;
log.data && console.group('flush');
Platform.performMicrotaskCheckpoint();
log.data && console.groupEnd();
});
}
};
// polling dirty checker
// flush periodically if platform does not have object observe.
if (!Observer.hasObjectObserve) {
var FLUSH_POLL_INTERVAL = 125;
window.addEventListener('WebComponentsReady', function() {
flush();
// watch document visiblity to toggle dirty-checking
var visibilityHandler = function() {
// only flush if the page is visibile
if (document.visibilityState === 'hidden') {
if (scope.flushPoll) {
clearInterval(scope.flushPoll);
}
} else {
scope.flushPoll = setInterval(flush, FLUSH_POLL_INTERVAL);
}
};
if (typeof document.visibilityState === 'string') {
document.addEventListener('visibilitychange', visibilityHandler);
}
visibilityHandler();
});
} else {
// make flush a no-op when we have Object.observe
flush = function() {};
}
if (window.CustomElements && !CustomElements.useNative) {
var originalImportNode = Document.prototype.importNode;
Document.prototype.importNode = function(node, deep) {
var imported = originalImportNode.call(this, node, deep);
CustomElements.upgradeAll(imported);
return imported;
};
}
// exports
scope.flush = flush;
// bc
Platform.flush = flush;
})(window.Polymer);
(function(scope) {
var urlResolver = {
resolveDom: function(root, url) {
url = url || baseUrl(root);
this.resolveAttributes(root, url);
this.resolveStyles(root, url);
// handle template.content
var templates = root.querySelectorAll('template');
if (templates) {
for (var i = 0, l = templates.length, t; (i < l) && (t = templates[i]); i++) {
if (t.content) {
this.resolveDom(t.content, url);
}
}
}
},
resolveTemplate: function(template) {
this.resolveDom(template.content, baseUrl(template));
},
resolveStyles: function(root, url) {
var styles = root.querySelectorAll('style');
if (styles) {
for (var i = 0, l = styles.length, s; (i < l) && (s = styles[i]); i++) {
this.resolveStyle(s, url);
}
}
},
resolveStyle: function(style, url) {
url = url || baseUrl(style);
style.textContent = this.resolveCssText(style.textContent, url);
},
resolveCssText: function(cssText, baseUrl, keepAbsolute) {
cssText = replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, CSS_URL_REGEXP);
return replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, CSS_IMPORT_REGEXP);
},
resolveAttributes: function(root, url) {
if (root.hasAttributes && root.hasAttributes()) {
this.resolveElementAttributes(root, url);
}
// search for attributes that host urls
var nodes = root && root.querySelectorAll(URL_ATTRS_SELECTOR);
if (nodes) {
for (var i = 0, l = nodes.length, n; (i < l) && (n = nodes[i]); i++) {
this.resolveElementAttributes(n, url);
}
}
},
resolveElementAttributes: function(node, url) {
url = url || baseUrl(node);
URL_ATTRS.forEach(function(v) {
var attr = node.attributes[v];
var value = attr && attr.value;
var replacement;
if (value && value.search(URL_TEMPLATE_SEARCH) < 0) {
if (v === 'style') {
replacement = replaceUrlsInCssText(value, url, false, CSS_URL_REGEXP);
} else {
replacement = resolveRelativeUrl(url, value);
}
attr.value = replacement;
}
});
}
};
var CSS_URL_REGEXP = /(url\()([^)]*)(\))/g;
var CSS_IMPORT_REGEXP = /(@import[\s]+(?!url\())([^;]*)(;)/g;
var URL_ATTRS = ['href', 'src', 'action', 'style', 'url'];
var URL_ATTRS_SELECTOR = '[' + URL_ATTRS.join('],[') + ']';
var URL_TEMPLATE_SEARCH = '{{.*}}';
var URL_HASH = '#';
function baseUrl(node) {
var u = new URL(node.ownerDocument.baseURI);
u.search = '';
u.hash = '';
return u;
}
function replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, regexp) {
return cssText.replace(regexp, function(m, pre, url, post) {
var urlPath = url.replace(/["']/g, '');
urlPath = resolveRelativeUrl(baseUrl, urlPath, keepAbsolute);
return pre + '\'' + urlPath + '\'' + post;
});
}
function resolveRelativeUrl(baseUrl, url, keepAbsolute) {
// do not resolve '/' absolute urls
if (url && url[0] === '/') {
return url;
}
var u = new URL(url, baseUrl);
return keepAbsolute ? u.href : makeDocumentRelPath(u.href);
}
function makeDocumentRelPath(url) {
var root = baseUrl(document.documentElement);
var u = new URL(url, root);
if (u.host === root.host && u.port === root.port &&
u.protocol === root.protocol) {
return makeRelPath(root, u);
} else {
return url;
}
}
// make a relative path from source to target
function makeRelPath(sourceUrl, targetUrl) {
var source = sourceUrl.pathname;
var target = targetUrl.pathname;
var s = source.split('/');
var t = target.split('/');
while (s.length && s[0] === t[0]){
s.shift();
t.shift();
}
for (var i = 0, l = s.length - 1; i < l; i++) {
t.unshift('..');
}
// empty '#' is discarded but we need to preserve it.
var hash = (targetUrl.href.slice(-1) === URL_HASH) ? URL_HASH : targetUrl.hash;
return t.join('/') + targetUrl.search + hash;
}
// exports
scope.urlResolver = urlResolver;
})(Polymer);
(function(scope) {
var endOfMicrotask = Polymer.endOfMicrotask;
// Generic url loader
function Loader(regex) {
this.cache = Object.create(null);
this.map = Object.create(null);
this.requests = 0;
this.regex = regex;
}
Loader.prototype = {
// TODO(dfreedm): there may be a better factoring here
// extract absolute urls from the text (full of relative urls)
extractUrls: function(text, base) {
var matches = [];
var matched, u;
while ((matched = this.regex.exec(text))) {
u = new URL(matched[1], base);
matches.push({matched: matched[0], url: u.href});
}
return matches;
},
// take a text blob, a root url, and a callback and load all the urls found within the text
// returns a map of absolute url to text
process: function(text, root, callback) {
var matches = this.extractUrls(text, root);
// every call to process returns all the text this loader has ever received
var done = callback.bind(null, this.map);
this.fetch(matches, done);
},
// build a mapping of url -> text from matches
fetch: function(matches, callback) {
var inflight = matches.length;
// return early if there is no fetching to be done
if (!inflight) {
return callback();
}
// wait for all subrequests to return
var done = function() {
if (--inflight === 0) {
callback();
}
};
// start fetching all subrequests
var m, req, url;
for (var i = 0; i < inflight; i++) {
m = matches[i];
url = m.url;
req = this.cache[url];
// if this url has already been requested, skip requesting it again
if (!req) {
req = this.xhr(url);
req.match = m;
this.cache[url] = req;
}
// wait for the request to process its subrequests
req.wait(done);
}
},
handleXhr: function(request) {
var match = request.match;
var url = match.url;
// handle errors with an empty string
var response = request.response || request.responseText || '';
this.map[url] = response;
this.fetch(this.extractUrls(response, url), request.resolve);
},
xhr: function(url) {
this.requests++;
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.send();
request.onerror = request.onload = this.handleXhr.bind(this, request);
// queue of tasks to run after XHR returns
request.pending = [];
request.resolve = function() {
var pending = request.pending;
for(var i = 0; i < pending.length; i++) {
pending[i]();
}
request.pending = null;
};
// if we have already resolved, pending is null, async call the callback
request.wait = function(fn) {
if (request.pending) {
request.pending.push(fn);
} else {
endOfMicrotask(fn);
}
};
return request;
}
};
scope.Loader = Loader;
})(Polymer);
(function(scope) {
var urlResolver = scope.urlResolver;
var Loader = scope.Loader;
function StyleResolver() {
this.loader = new Loader(this.regex);
}
StyleResolver.prototype = {
regex: /@import\s+(?:url)?["'\(]*([^'"\)]*)['"\)]*;/g,
// Recursively replace @imports with the text at that url
resolve: function(text, url, callback) {
var done = function(map) {
callback(this.flatten(text, url, map));
}.bind(this);
this.loader.process(text, url, done);
},
// resolve the textContent of a style node
resolveNode: function(style, url, callback) {
var text = style.textContent;
var done = function(text) {
style.textContent = text;
callback(style);
};
this.resolve(text, url, done);
},
// flatten all the @imports to text
flatten: function(text, base, map) {
var matches = this.loader.extractUrls(text, base);
var match, url, intermediate;
for (var i = 0; i < matches.length; i++) {
match = matches[i];
url = match.url;
// resolve any css text to be relative to the importer, keep absolute url
intermediate = urlResolver.resolveCssText(map[url], url, true);
// flatten intermediate @imports
intermediate = this.flatten(intermediate, base, map);
text = text.replace(match.matched, intermediate);
}
return text;
},
loadStyles: function(styles, base, callback) {
var loaded=0, l = styles.length;
// called in the context of the style
function loadedStyle(style) {
loaded++;
if (loaded === l && callback) {
callback();
}
}
for (var i=0, s; (i
HTMLElement.getPrototypeForTag = function(tag) {
var prototype = !tag ? HTMLElement.prototype : registry[tag];
// TODO(sjmiles): creating is likely to have wasteful side-effects
return prototype || Object.getPrototypeOf(document.createElement(tag));
};
// we have to flag propagation stoppage for the event dispatcher
var originalStopPropagation = Event.prototype.stopPropagation;
Event.prototype.stopPropagation = function() {
this.cancelBubble = true;
originalStopPropagation.apply(this, arguments);
};
// polyfill DOMTokenList
// * add/remove: allow these methods to take multiple classNames
// * toggle: add a 2nd argument which forces the given state rather
// than toggling.
var add = DOMTokenList.prototype.add;
var remove = DOMTokenList.prototype.remove;
DOMTokenList.prototype.add = function() {
for (var i = 0; i < arguments.length; i++) {
add.call(this, arguments[i]);
}
};
DOMTokenList.prototype.remove = function() {
for (var i = 0; i < arguments.length; i++) {
remove.call(this, arguments[i]);
}
};
DOMTokenList.prototype.toggle = function(name, bool) {
if (arguments.length == 1) {
bool = !this.contains(name);
}
bool ? this.add(name) : this.remove(name);
};
DOMTokenList.prototype.switch = function(oldName, newName) {
oldName && this.remove(oldName);
newName && this.add(newName);
};
// add array() to NodeList, NamedNodeMap, HTMLCollection
var ArraySlice = function() {
return Array.prototype.slice.call(this);
};
var namedNodeMap = (window.NamedNodeMap || window.MozNamedAttrMap || {});
NodeList.prototype.array = ArraySlice;
namedNodeMap.prototype.array = ArraySlice;
HTMLCollection.prototype.array = ArraySlice;
// utility
function createDOM(inTagOrNode, inHTML, inAttrs) {
var dom = typeof inTagOrNode == 'string' ?
document.createElement(inTagOrNode) : inTagOrNode.cloneNode(true);
dom.innerHTML = inHTML;
if (inAttrs) {
for (var n in inAttrs) {
dom.setAttribute(n, inAttrs[n]);
}
}
return dom;
}
// exports
scope.createDOM = createDOM;
})(Polymer);
(function(scope) {
// super
// `arrayOfArgs` is an optional array of args like one might pass
// to `Function.apply`
// TODO(sjmiles):
// $super must be installed on an instance or prototype chain
// as `super`, and invoked via `this`, e.g.
// `this.super();`
// will not work if function objects are not unique, for example,
// when using mixins.
// The memoization strategy assumes each function exists on only one
// prototype chain i.e. we use the function object for memoizing)
// perhaps we can bookkeep on the prototype itself instead
function $super(arrayOfArgs) {
// since we are thunking a method call, performance is important here:
// memoize all lookups, once memoized the fast path calls no other
// functions
//
// find the caller (cannot be `strict` because of 'caller')
var caller = $super.caller;
// memoized 'name of method'
var nom = caller.nom;
// memoized next implementation prototype
var _super = caller._super;
if (!_super) {
if (!nom) {
nom = caller.nom = nameInThis.call(this, caller);
}
if (!nom) {
console.warn('called super() on a method not installed declaratively (has no .nom property)');
}
// super prototype is either cached or we have to find it
// by searching __proto__ (at the 'top')
// invariant: because we cache _super on fn below, we never reach
// here from inside a series of calls to super(), so it's ok to
// start searching from the prototype of 'this' (at the 'top')
// we must never memoize a null super for this reason
_super = memoizeSuper(caller, nom, getPrototypeOf(this));
}
// our super function
var fn = _super[nom];
if (fn) {
// memoize information so 'fn' can call 'super'
if (!fn._super) {
// must not memoize null, or we lose our invariant above
memoizeSuper(fn, nom, _super);
}
// invoke the inherited method
// if 'fn' is not function valued, this will throw
return fn.apply(this, arrayOfArgs || []);
}
}
function nameInThis(value) {
var p = this.__proto__;
while (p && p !== HTMLElement.prototype) {
// TODO(sjmiles): getOwnPropertyNames is absurdly expensive
var n$ = Object.getOwnPropertyNames(p);
for (var i=0, l=n$.length, n; icancelAsync to cancel the
* asynchronous call.
*
* @method async
* @param {Function|String} method
* @param {any|Array} args
* @param {number} timeout
*/
async: function(method, args, timeout) {
// when polyfilling Object.observe, ensure changes
// propagate before executing the async method
Polymer.flush();
// second argument to `apply` must be an array
args = (args && args.length) ? args : [args];
// function to invoke
var fn = function() {
(this[method] || method).apply(this, args);
}.bind(this);
// execute `fn` sooner or later
var handle = timeout ? setTimeout(fn, timeout) :
requestAnimationFrame(fn);
// NOTE: switch on inverting handle to determine which time is used.
return timeout ? handle : ~handle;
},
/**
* Cancels a pending callback that was scheduled via
* async .
*
* @method cancelAsync
* @param {handle} handle Handle of the `async` to cancel.
*/
cancelAsync: function(handle) {
if (handle < 0) {
cancelAnimationFrame(~handle);
} else {
clearTimeout(handle);
}
},
/**
* Fire an event.
*
* @method fire
* @returns {Object} event
* @param {string} type An event name.
* @param {any} detail
* @param {Node} onNode Target node.
* @param {Boolean} bubbles Set false to prevent bubbling, defaults to true
* @param {Boolean} cancelable Set false to prevent cancellation, defaults to true
*/
fire: function(type, detail, onNode, bubbles, cancelable) {
var node = onNode || this;
var detail = detail === null || detail === undefined ? {} : detail;
var event = new CustomEvent(type, {
bubbles: bubbles !== undefined ? bubbles : true,
cancelable: cancelable !== undefined ? cancelable : true,
detail: detail
});
node.dispatchEvent(event);
return event;
},
/**
* Fire an event asynchronously.
*
* @method asyncFire
* @param {string} type An event name.
* @param detail
* @param {Node} toNode Target node.
*/
asyncFire: function(/*inType, inDetail*/) {
this.async("fire", arguments);
},
/**
* Remove class from old, add class to anew, if they exist.
*
* @param classFollows
* @param anew A node.
* @param old A node
* @param className
*/
classFollows: function(anew, old, className) {
if (old) {
old.classList.remove(className);
}
if (anew) {
anew.classList.add(className);
}
},
/**
* Inject HTML which contains markup bound to this element into
* a target element (replacing target element content).
*
* @param String html to inject
* @param Element target element
*/
injectBoundHTML: function(html, element) {
var template = document.createElement('template');
template.innerHTML = html;
var fragment = this.instanceTemplate(template);
if (element) {
element.textContent = '';
element.appendChild(fragment);
}
return fragment;
}
};
// no-operation function for handy stubs
var nop = function() {};
// null-object for handy stubs
var nob = {};
// deprecated
utils.asyncMethod = utils.async;
// exports
scope.api.instance.utils = utils;
scope.nop = nop;
scope.nob = nob;
})(Polymer);
(function(scope) {
// imports
var log = window.WebComponents ? WebComponents.flags.log : {};
var EVENT_PREFIX = 'on-';
// instance events api
var events = {
// read-only
EVENT_PREFIX: EVENT_PREFIX,
// event listeners on host
addHostListeners: function() {
var events = this.eventDelegates;
log.events && (Object.keys(events).length > 0) && console.log('[%s] addHostListeners:', this.localName, events);
// NOTE: host events look like bindings but really are not;
// (1) we don't want the attribute to be set and (2) we want to support
// multiple event listeners ('host' and 'instance') and Node.bind
// by default supports 1 thing being bound.
for (var type in events) {
var methodName = events[type];
PolymerGestures.addEventListener(this, type, this.element.getEventHandler(this, this, methodName));
}
},
// call 'method' or function method on 'obj' with 'args', if the method exists
dispatchMethod: function(obj, method, args) {
if (obj) {
log.events && console.group('[%s] dispatch [%s]', obj.localName, method);
var fn = typeof method === 'function' ? method : obj[method];
if (fn) {
fn[args ? 'apply' : 'call'](obj, args);
}
log.events && console.groupEnd();
// NOTE: dirty check right after calling method to ensure
// changes apply quickly; in a very complicated app using high
// frequency events, this can be a perf concern; in this case,
// imperative handlers can be used to avoid flushing.
Polymer.flush();
}
}
};
// exports
scope.api.instance.events = events;
/**
* @class Polymer
*/
/**
* Add a gesture aware event handler to the given `node`. Can be used
* in place of `element.addEventListener` and ensures gestures will function
* as expected on mobile platforms. Please note that Polymer's declarative
* event handlers include this functionality by default.
*
* @method addEventListener
* @param {Node} node node on which to listen
* @param {String} eventType name of the event
* @param {Function} handlerFn event handler function
* @param {Boolean} capture set to true to invoke event capturing
* @type Function
*/
// alias PolymerGestures event listener logic
scope.addEventListener = function(node, eventType, handlerFn, capture) {
PolymerGestures.addEventListener(wrap(node), eventType, handlerFn, capture);
};
/**
* Remove a gesture aware event handler on the given `node`. To remove an
* event listener, the exact same arguments are required that were passed
* to `Polymer.addEventListener`.
*
* @method removeEventListener
* @param {Node} node node on which to listen
* @param {String} eventType name of the event
* @param {Function} handlerFn event handler function
* @param {Boolean} capture set to true to invoke event capturing
* @type Function
*/
scope.removeEventListener = function(node, eventType, handlerFn, capture) {
PolymerGestures.removeEventListener(wrap(node), eventType, handlerFn, capture);
};
})(Polymer);
(function(scope) {
// instance api for attributes
var attributes = {
// copy attributes defined in the element declaration to the instance
// e.g. tabIndex is copied
// to the element instance here.
copyInstanceAttributes: function () {
var a$ = this._instanceAttributes;
for (var k in a$) {
if (!this.hasAttribute(k)) {
this.setAttribute(k, a$[k]);
}
}
},
// for each attribute on this, deserialize value to property as needed
takeAttributes: function() {
// if we have no publish lookup table, we have no attributes to take
// TODO(sjmiles): ad hoc
if (this._publishLC) {
for (var i=0, a$=this.attributes, l=a$.length, a; (a=a$[i]) && i= 0) {
return;
}
// get original value
var currentValue = this[name];
// deserialize Boolean or Number values from attribute
var value = this.deserializeValue(value, currentValue);
// only act if the value has changed
if (value !== currentValue) {
// install new value (has side-effects)
this[name] = value;
}
}
},
// return the published property matching name, or undefined
propertyForAttribute: function(name) {
var match = this._publishLC && this._publishLC[name];
return match;
},
// convert representation of `stringValue` based on type of `currentValue`
deserializeValue: function(stringValue, currentValue) {
return scope.deserializeValue(stringValue, currentValue);
},
// convert to a string value based on the type of `inferredType`
serializeValue: function(value, inferredType) {
if (inferredType === 'boolean') {
return value ? '' : undefined;
} else if (inferredType !== 'object' && inferredType !== 'function'
&& value !== undefined) {
return value;
}
},
// serializes `name` property value and updates the corresponding attribute
// note that reflection is opt-in.
reflectPropertyToAttribute: function(name) {
var inferredType = typeof this[name];
// try to intelligently serialize property value
var serializedValue = this.serializeValue(this[name], inferredType);
// boolean properties must reflect as boolean attributes
if (serializedValue !== undefined) {
this.setAttribute(name, serializedValue);
// TODO(sorvell): we should remove attr for all properties
// that have undefined serialization; however, we will need to
// refine the attr reflection system to achieve this; pica, for example,
// relies on having inferredType object properties not removed as
// attrs.
} else if (inferredType === 'boolean') {
this.removeAttribute(name);
}
}
};
// exports
scope.api.instance.attributes = attributes;
})(Polymer);
(function(scope) {
/**
* @class polymer-base
*/
// imports
var log = window.WebComponents ? WebComponents.flags.log : {};
// magic words
var OBSERVE_SUFFIX = 'Changed';
// element api
var empty = [];
var updateRecord = {
object: undefined,
type: 'update',
name: undefined,
oldValue: undefined
};
var numberIsNaN = Number.isNaN || function(value) {
return typeof value === 'number' && isNaN(value);
};
function areSameValue(left, right) {
if (left === right)
return left !== 0 || 1 / left === 1 / right;
if (numberIsNaN(left) && numberIsNaN(right))
return true;
return left !== left && right !== right;
}
// capture A's value if B's value is null or undefined,
// otherwise use B's value
function resolveBindingValue(oldValue, value) {
if (value === undefined && oldValue === null) {
return value;
}
return (value === null || value === undefined) ? oldValue : value;
}
var properties = {
// creates a CompoundObserver to observe property changes
// NOTE, this is only done there are any properties in the `observe` object
createPropertyObserver: function() {
var n$ = this._observeNames;
if (n$ && n$.length) {
var o = this._propertyObserver = new CompoundObserver(true);
this.registerObserver(o);
// TODO(sorvell): may not be kosher to access the value here (this[n]);
// previously we looked at the descriptor on the prototype
// this doesn't work for inheritance and not for accessors without
// a value property
for (var i=0, l=n$.length, n; (i work)
HTMLTemplateElement.decorate(template);
// ensure a default bindingDelegate
var syntax = this.syntax || (!template.bindingDelegate &&
this.element.syntax);
var dom = template.createInstance(this, syntax);
var observers = dom.bindings_;
for (var i = 0; i < observers.length; i++) {
this.registerObserver(observers[i]);
}
return dom;
},
// Called by TemplateBinding/NodeBind to setup a binding to the given
// property. It's overridden here to support property bindings
// in addition to attribute bindings that are supported by default.
bind: function(name, observable, oneTime) {
var property = this.propertyForAttribute(name);
if (!property) {
// TODO(sjmiles): this mixin method must use the special form
// of `super` installed by `mixinMethod` in declaration/prototype.js
return this.mixinSuper(arguments);
} else {
// use n-way Polymer binding
var observer = this.bindProperty(property, observable, oneTime);
// NOTE: reflecting binding information is typically required only for
// tooling. It has a performance cost so it's opt-in in Node.bind.
if (Platform.enableBindingsReflection && observer) {
observer.path = observable.path_;
this._recordBinding(property, observer);
}
if (this.reflect[property]) {
this.reflectPropertyToAttribute(property);
}
return observer;
}
},
_recordBinding: function(name, observer) {
this.bindings_ = this.bindings_ || {};
this.bindings_[name] = observer;
},
// Called by TemplateBinding when all bindings on an element have been
// executed. This signals that all element inputs have been gathered
// and it's safe to ready the element, create shadow-root and start
// data-observation.
bindFinished: function() {
this.makeElementReady();
},
// called at detached time to signal that an element's bindings should be
// cleaned up. This is done asynchronously so that users have the chance
// to call `cancelUnbindAll` to prevent unbinding.
asyncUnbindAll: function() {
if (!this._unbound) {
log.unbind && console.log('[%s] asyncUnbindAll', this.localName);
this._unbindAllJob = this.job(this._unbindAllJob, this.unbindAll, 0);
}
},
/**
* This method should rarely be used and only if
* `cancelUnbindAll` has been called to
* prevent element unbinding. In this case, the element's bindings will
* not be automatically cleaned up and it cannot be garbage collected
* by the system. If memory pressure is a concern or a
* large amount of elements need to be managed in this way, `unbindAll`
* can be called to deactivate the element's bindings and allow its
* memory to be reclaimed.
*
* @method unbindAll
*/
unbindAll: function() {
if (!this._unbound) {
this.closeObservers();
this.closeNamedObservers();
this._unbound = true;
}
},
/**
* Call in `detached` to prevent the element from unbinding when it is
* detached from the dom. The element is unbound as a cleanup step that
* allows its memory to be reclaimed.
* If `cancelUnbindAll` is used, consider calling
* `unbindAll` when the element is no longer
* needed. This will allow its memory to be reclaimed.
*
* @method cancelUnbindAll
*/
cancelUnbindAll: function() {
if (this._unbound) {
log.unbind && console.warn('[%s] already unbound, cannot cancel unbindAll', this.localName);
return;
}
log.unbind && console.log('[%s] cancelUnbindAll', this.localName);
if (this._unbindAllJob) {
this._unbindAllJob = this._unbindAllJob.stop();
}
}
};
function unbindNodeTree(node) {
forNodeTree(node, _nodeUnbindAll);
}
function _nodeUnbindAll(node) {
node.unbindAll();
}
function forNodeTree(node, callback) {
if (node) {
callback(node);
for (var child = node.firstChild; child; child = child.nextSibling) {
forNodeTree(child, callback);
}
}
}
var mustachePattern = /\{\{([^{}]*)}}/;
// exports
scope.bindPattern = mustachePattern;
scope.api.instance.mdv = mdv;
})(Polymer);
(function(scope) {
/**
* Common prototype for all Polymer Elements.
*
* @class polymer-base
* @homepage polymer.github.io
*/
var base = {
/**
* Tags this object as the canonical Base prototype.
*
* @property PolymerBase
* @type boolean
* @default true
*/
PolymerBase: true,
/**
* Debounce signals.
*
* Call `job` to defer a named signal, and all subsequent matching signals,
* until a wait time has elapsed with no new signal.
*
* debouncedClickAction: function(e) {
* // processClick only when it's been 100ms since the last click
* this.job('click', function() {
* this.processClick;
* }, 100);
* }
*
* @method job
* @param String {String} job A string identifier for the job to debounce.
* @param Function {Function} callback A function that is called (with `this` context) when the wait time elapses.
* @param Number {Number} wait Time in milliseconds (ms) after the last signal that must elapse before invoking `callback`
* @type Handle
*/
job: function(job, callback, wait) {
if (typeof job === 'string') {
var n = '___' + job;
this[n] = Polymer.job.call(this, this[n], callback, wait);
} else {
// TODO(sjmiles): suggest we deprecate this call signature
return Polymer.job.call(this, job, callback, wait);
}
},
/**
* Invoke a superclass method.
*
* Use `super()` to invoke the most recently overridden call to the
* currently executing function.
*
* To pass arguments through, use the literal `arguments` as the parameter
* to `super()`.
*
* nextPageAction: function(e) {
* // invoke the superclass version of `nextPageAction`
* this.super(arguments);
* }
*
* To pass custom arguments, arrange them in an array.
*
* appendSerialNo: function(value, serial) {
* // prefix the superclass serial number with our lot # before
* // invoking the superlcass
* return this.super([value, this.lotNo + serial])
* }
*
* @method super
* @type Any
* @param {args) An array of arguments to use when calling the superclass method, or null.
*/
super: Polymer.super,
/**
* Lifecycle method called when the element is instantiated.
*
* Override `created` to perform custom create-time tasks. No need to call
* super-class `created` unless you are extending another Polymer element.
* Created is called before the element creates `shadowRoot` or prepares
* data-observation.
*
* @method created
* @type void
*/
created: function() {
},
/**
* Lifecycle method called when the element has populated it's `shadowRoot`,
* prepared data-observation, and made itself ready for API interaction.
*
* @method ready
* @type void
*/
ready: function() {
},
/**
* Low-level lifecycle method called as part of standard Custom Elements
* operation. Polymer implements this method to provide basic default
* functionality. For custom create-time tasks, implement `created`
* instead, which is called immediately after `createdCallback`.
*
* @method createdCallback
*/
createdCallback: function() {
if (this.templateInstance && this.templateInstance.model) {
console.warn('Attributes on ' + this.localName + ' were data bound ' +
'prior to Polymer upgrading the element. This may result in ' +
'incorrect binding types.');
}
this.created();
this.prepareElement();
if (!this.ownerDocument.isStagingDocument) {
this.makeElementReady();
}
},
// system entry point, do not override
prepareElement: function() {
if (this._elementPrepared) {
console.warn('Element already prepared', this.localName);
return;
}
this._elementPrepared = true;
// storage for shadowRoots info
this.shadowRoots = {};
// install property observers
this.createPropertyObserver();
this.openPropertyObserver();
// install boilerplate attributes
this.copyInstanceAttributes();
// process input attributes
this.takeAttributes();
// add event listeners
this.addHostListeners();
},
// system entry point, do not override
makeElementReady: function() {
if (this._readied) {
return;
}
this._readied = true;
this.createComputedProperties();
this.parseDeclarations(this.__proto__);
// NOTE: Support use of the `unresolved` attribute to help polyfill
// custom elements' `:unresolved` feature.
this.removeAttribute('unresolved');
// user entry point
this.ready();
},
/**
* Low-level lifecycle method called as part of standard Custom Elements
* operation. Polymer implements this method to provide basic default
* functionality. For custom tasks in your element, implement `attributeChanged`
* instead, which is called immediately after `attributeChangedCallback`.
*
* @method attributeChangedCallback
*/
attributeChangedCallback: function(name, oldValue) {
// TODO(sjmiles): adhoc filter
if (name !== 'class' && name !== 'style') {
this.attributeToProperty(name, this.getAttribute(name));
}
if (this.attributeChanged) {
this.attributeChanged.apply(this, arguments);
}
},
/**
* Low-level lifecycle method called as part of standard Custom Elements
* operation. Polymer implements this method to provide basic default
* functionality. For custom create-time tasks, implement `attached`
* instead, which is called immediately after `attachedCallback`.
*
* @method attachedCallback
*/
attachedCallback: function() {
// when the element is attached, prevent it from unbinding.
this.cancelUnbindAll();
// invoke user action
if (this.attached) {
this.attached();
}
if (!this.hasBeenAttached) {
this.hasBeenAttached = true;
if (this.domReady) {
this.async('domReady');
}
}
},
/**
* Implement to access custom elements in dom descendants, ancestors,
* or siblings. Because custom elements upgrade in document order,
* elements accessed in `ready` or `attached` may not be upgraded. When
* `domReady` is called, all registered custom elements are guaranteed
* to have been upgraded.
*
* @method domReady
*/
/**
* Low-level lifecycle method called as part of standard Custom Elements
* operation. Polymer implements this method to provide basic default
* functionality. For custom create-time tasks, implement `detached`
* instead, which is called immediately after `detachedCallback`.
*
* @method detachedCallback
*/
detachedCallback: function() {
if (!this.preventDispose) {
this.asyncUnbindAll();
}
// invoke user action
if (this.detached) {
this.detached();
}
// TODO(sorvell): bc
if (this.leftView) {
this.leftView();
}
},
/**
* Walks the prototype-chain of this element and allows specific
* classes a chance to process static declarations.
*
* In particular, each polymer-element has it's own `template`.
* `parseDeclarations` is used to accumulate all element `template`s
* from an inheritance chain.
*
* `parseDeclaration` static methods implemented in the chain are called
* recursively, oldest first, with the `` associated
* with the current prototype passed as an argument.
*
* An element may override this method to customize shadow-root generation.
*
* @method parseDeclarations
*/
parseDeclarations: function(p) {
if (p && p.element) {
this.parseDeclarations(p.__proto__);
p.parseDeclaration.call(this, p.element);
}
},
/**
* Perform init-time actions based on static information in the
* `` instance argument.
*
* For example, the standard implementation locates the template associated
* with the given `` and stamps it into a shadow-root to
* implement shadow inheritance.
*
* An element may override this method for custom behavior.
*
* @method parseDeclaration
*/
parseDeclaration: function(elementElement) {
var template = this.fetchTemplate(elementElement);
if (template) {
var root = this.shadowFromTemplate(template);
this.shadowRoots[elementElement.name] = root;
}
},
/**
* Given a ``, find an associated template (if any) to be
* used for shadow-root generation.
*
* An element may override this method for custom behavior.
*
* @method fetchTemplate
*/
fetchTemplate: function(elementElement) {
return elementElement.querySelector('template');
},
/**
* Create a shadow-root in this host and stamp `template` as it's
* content.
*
* An element may override this method for custom behavior.
*
* @method shadowFromTemplate
*/
shadowFromTemplate: function(template) {
if (template) {
// make a shadow root
var root = this.createShadowRoot();
// stamp template
// which includes parsing and applying MDV bindings before being
// inserted (to avoid {{}} in attribute values)
// e.g. to prevent into light-dom
lightFromTemplate: function(template, refNode) {
if (template) {
// TODO(sorvell): mark this element as an eventController so that
// event listeners on bound nodes inside it will be called on it.
// Note, the expectation here is that events on all descendants
// should be handled by this element.
this.eventController = this;
// stamp template
// which includes parsing and applying MDV bindings before being
// inserted (to avoid {{}} in attribute values)
// e.g. to prevent polymer-base in it's prototype chain.
*
* @method isBase
* @param Object {Object} object Object to test.
* @type Boolean
*/
function isBase(object) {
return object.hasOwnProperty('PolymerBase')
}
// name a base constructor for dev tools
/**
* The Polymer base-class constructor.
*
* @property Base
* @type Function
*/
function PolymerBase() {};
PolymerBase.prototype = base;
base.constructor = PolymerBase;
// exports
scope.Base = PolymerBase;
scope.isBase = isBase;
scope.api.instance.base = base;
})(Polymer);
(function(scope) {
// imports
var log = window.WebComponents ? WebComponents.flags.log : {};
var hasShadowDOMPolyfill = window.ShadowDOMPolyfill;
// magic words
var STYLE_SCOPE_ATTRIBUTE = 'element';
var STYLE_CONTROLLER_SCOPE = 'controller';
var styles = {
STYLE_SCOPE_ATTRIBUTE: STYLE_SCOPE_ATTRIBUTE,
/**
* Installs external stylesheets and 