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A robust and multipurpose Graph object for JavaScript.
The newest version!
import { EventEmitter } from 'events';
import Iterator from 'obliterator/iterator';
import take from 'obliterator/take';
import chain from 'obliterator/chain';
/**
* Graphology Utilities
* =====================
*
* Collection of helpful functions used by the implementation.
*/
/**
* Object.assign-like polyfill.
*
* @param {object} target - First object.
* @param {object} [...objects] - Objects to merge.
* @return {object}
*/
function assignPolyfill() {
const target = arguments[0];
for (let i = 1, l = arguments.length; i < l; i++) {
if (!arguments[i]) continue;
for (const k in arguments[i]) target[k] = arguments[i][k];
}
return target;
}
let assign = assignPolyfill;
if (typeof Object.assign === 'function') assign = Object.assign;
/**
* Function returning the first matching edge for given path.
* Note: this function does not check the existence of source & target. This
* must be performed by the caller.
*
* @param {Graph} graph - Target graph.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {string} type - Type of the edge (mixed, directed or undirected).
* @return {string|null}
*/
function getMatchingEdge(graph, source, target, type) {
const sourceData = graph._nodes.get(source);
let edge = null;
if (!sourceData) return edge;
if (type === 'mixed') {
edge =
(sourceData.out && sourceData.out[target]) ||
(sourceData.undirected && sourceData.undirected[target]);
} else if (type === 'directed') {
edge = sourceData.out && sourceData.out[target];
} else {
edge = sourceData.undirected && sourceData.undirected[target];
}
return edge;
}
/**
* Checks whether the given value is a plain object.
*
* @param {mixed} value - Target value.
* @return {boolean}
*/
function isPlainObject(value) {
// NOTE: as per https://github.com/graphology/graphology/issues/149
// this function has been loosened not to reject object instances
// coming from other JavaScript contexts. It has also been chosen
// not to improve it to avoid obvious false positives and avoid
// taking a performance hit. People should really use TypeScript
// if they want to avoid feeding subtly irrelvant attribute objects.
return typeof value === 'object' && value !== null;
}
/**
* Checks whether the given object is empty.
*
* @param {object} o - Target Object.
* @return {boolean}
*/
function isEmpty(o) {
let k;
for (k in o) return false;
return true;
}
/**
* Creates a "private" property for the given member name by concealing it
* using the `enumerable` option.
*
* @param {object} target - Target object.
* @param {string} name - Member name.
*/
function privateProperty(target, name, value) {
Object.defineProperty(target, name, {
enumerable: false,
configurable: false,
writable: true,
value
});
}
/**
* Creates a read-only property for the given member name & the given getter.
*
* @param {object} target - Target object.
* @param {string} name - Member name.
* @param {mixed} value - The attached getter or fixed value.
*/
function readOnlyProperty(target, name, value) {
const descriptor = {
enumerable: true,
configurable: true
};
if (typeof value === 'function') {
descriptor.get = value;
} else {
descriptor.value = value;
descriptor.writable = false;
}
Object.defineProperty(target, name, descriptor);
}
/**
* Returns whether the given object constitute valid hints.
*
* @param {object} hints - Target object.
*/
function validateHints(hints) {
if (!isPlainObject(hints)) return false;
if (hints.attributes && !Array.isArray(hints.attributes)) return false;
return true;
}
/**
* Creates a function generating incremental ids for edges.
*
* @return {function}
*/
function incrementalIdStartingFromRandomByte() {
let i = Math.floor(Math.random() * 256) & 0xff;
return () => {
return i++;
};
}
/**
* Graphology Custom Errors
* =========================
*
* Defining custom errors for ease of use & easy unit tests across
* implementations (normalized typology rather than relying on error
* messages to check whether the correct error was found).
*/
class GraphError extends Error {
constructor(message) {
super();
this.name = 'GraphError';
this.message = message;
}
}
class InvalidArgumentsGraphError extends GraphError {
constructor(message) {
super(message);
this.name = 'InvalidArgumentsGraphError';
// This is V8 specific to enhance stack readability
if (typeof Error.captureStackTrace === 'function')
Error.captureStackTrace(
this,
InvalidArgumentsGraphError.prototype.constructor
);
}
}
class NotFoundGraphError extends GraphError {
constructor(message) {
super(message);
this.name = 'NotFoundGraphError';
// This is V8 specific to enhance stack readability
if (typeof Error.captureStackTrace === 'function')
Error.captureStackTrace(this, NotFoundGraphError.prototype.constructor);
}
}
class UsageGraphError extends GraphError {
constructor(message) {
super(message);
this.name = 'UsageGraphError';
// This is V8 specific to enhance stack readability
if (typeof Error.captureStackTrace === 'function')
Error.captureStackTrace(this, UsageGraphError.prototype.constructor);
}
}
/**
* Graphology Internal Data Classes
* =================================
*
* Internal classes hopefully reduced to structs by engines & storing
* necessary information for nodes & edges.
*
* Note that those classes don't rely on the `class` keyword to avoid some
* cruft introduced by most of ES2015 transpilers.
*/
/**
* MixedNodeData class.
*
* @constructor
* @param {string} string - The node's key.
* @param {object} attributes - Node's attributes.
*/
function MixedNodeData(key, attributes) {
// Attributes
this.key = key;
this.attributes = attributes;
this.clear();
}
MixedNodeData.prototype.clear = function () {
// Degrees
this.inDegree = 0;
this.outDegree = 0;
this.undirectedDegree = 0;
this.undirectedLoops = 0;
this.directedLoops = 0;
// Indices
this.in = {};
this.out = {};
this.undirected = {};
};
/**
* DirectedNodeData class.
*
* @constructor
* @param {string} string - The node's key.
* @param {object} attributes - Node's attributes.
*/
function DirectedNodeData(key, attributes) {
// Attributes
this.key = key;
this.attributes = attributes;
this.clear();
}
DirectedNodeData.prototype.clear = function () {
// Degrees
this.inDegree = 0;
this.outDegree = 0;
this.directedLoops = 0;
// Indices
this.in = {};
this.out = {};
};
/**
* UndirectedNodeData class.
*
* @constructor
* @param {string} string - The node's key.
* @param {object} attributes - Node's attributes.
*/
function UndirectedNodeData(key, attributes) {
// Attributes
this.key = key;
this.attributes = attributes;
this.clear();
}
UndirectedNodeData.prototype.clear = function () {
// Degrees
this.undirectedDegree = 0;
this.undirectedLoops = 0;
// Indices
this.undirected = {};
};
/**
* EdgeData class.
*
* @constructor
* @param {boolean} undirected - Whether the edge is undirected.
* @param {string} string - The edge's key.
* @param {string} source - Source of the edge.
* @param {string} target - Target of the edge.
* @param {object} attributes - Edge's attributes.
*/
function EdgeData(undirected, key, source, target, attributes) {
// Attributes
this.key = key;
this.attributes = attributes;
this.undirected = undirected;
// Extremities
this.source = source;
this.target = target;
}
EdgeData.prototype.attach = function () {
let outKey = 'out';
let inKey = 'in';
if (this.undirected) outKey = inKey = 'undirected';
const source = this.source.key;
const target = this.target.key;
// Handling source
this.source[outKey][target] = this;
if (this.undirected && source === target) return;
// Handling target
this.target[inKey][source] = this;
};
EdgeData.prototype.attachMulti = function () {
let outKey = 'out';
let inKey = 'in';
const source = this.source.key;
const target = this.target.key;
if (this.undirected) outKey = inKey = 'undirected';
// Handling source
const adj = this.source[outKey];
const head = adj[target];
if (typeof head === 'undefined') {
adj[target] = this;
// Self-loop optimization
if (!(this.undirected && source === target)) {
// Handling target
this.target[inKey][source] = this;
}
return;
}
// Prepending to doubly-linked list
head.previous = this;
this.next = head;
// Pointing to new head
// NOTE: use mutating swap later to avoid lookup?
adj[target] = this;
this.target[inKey][source] = this;
};
EdgeData.prototype.detach = function () {
const source = this.source.key;
const target = this.target.key;
let outKey = 'out';
let inKey = 'in';
if (this.undirected) outKey = inKey = 'undirected';
delete this.source[outKey][target];
// No-op delete in case of undirected self-loop
delete this.target[inKey][source];
};
EdgeData.prototype.detachMulti = function () {
const source = this.source.key;
const target = this.target.key;
let outKey = 'out';
let inKey = 'in';
if (this.undirected) outKey = inKey = 'undirected';
// Deleting from doubly-linked list
if (this.previous === undefined) {
// We are dealing with the head
// Should we delete the adjacency entry because it is now empty?
if (this.next === undefined) {
delete this.source[outKey][target];
// No-op delete in case of undirected self-loop
delete this.target[inKey][source];
} else {
// Detaching
this.next.previous = undefined;
// NOTE: could avoid the lookups by creating a #.become mutating method
this.source[outKey][target] = this.next;
// No-op delete in case of undirected self-loop
this.target[inKey][source] = this.next;
}
} else {
// We are dealing with another list node
this.previous.next = this.next;
// If not last
if (this.next !== undefined) {
this.next.previous = this.previous;
}
}
};
/**
* Graphology Node Attributes methods
* ===================================
*/
const NODE = 0;
const SOURCE = 1;
const TARGET = 2;
const OPPOSITE = 3;
function findRelevantNodeData(
graph,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1,
add2
) {
let nodeData, edgeData, arg1, arg2;
nodeOrEdge = '' + nodeOrEdge;
if (mode === NODE) {
nodeData = graph._nodes.get(nodeOrEdge);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${nodeOrEdge}" node in the graph.`
);
arg1 = nameOrEdge;
arg2 = add1;
} else if (mode === OPPOSITE) {
nameOrEdge = '' + nameOrEdge;
edgeData = graph._edges.get(nameOrEdge);
if (!edgeData)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${nameOrEdge}" edge in the graph.`
);
const source = edgeData.source.key;
const target = edgeData.target.key;
if (nodeOrEdge === source) {
nodeData = edgeData.target;
} else if (nodeOrEdge === target) {
nodeData = edgeData.source;
} else {
throw new NotFoundGraphError(
`Graph.${method}: the "${nodeOrEdge}" node is not attached to the "${nameOrEdge}" edge (${source}, ${target}).`
);
}
arg1 = add1;
arg2 = add2;
} else {
edgeData = graph._edges.get(nodeOrEdge);
if (!edgeData)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${nodeOrEdge}" edge in the graph.`
);
if (mode === SOURCE) {
nodeData = edgeData.source;
} else {
nodeData = edgeData.target;
}
arg1 = nameOrEdge;
arg2 = add1;
}
return [nodeData, arg1, arg2];
}
function attachNodeAttributeGetter(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, name] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
return data.attributes[name];
};
}
function attachNodeAttributesGetter(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge) {
const [data] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge
);
return data.attributes;
};
}
function attachNodeAttributeChecker(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, name] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
return data.attributes.hasOwnProperty(name);
};
}
function attachNodeAttributeSetter(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1, add2) {
const [data, name, value] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1,
add2
);
data.attributes[name] = value;
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'set',
attributes: data.attributes,
name
});
return this;
};
}
function attachNodeAttributeUpdater(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1, add2) {
const [data, name, updater] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1,
add2
);
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.${method}: updater should be a function.`
);
const attributes = data.attributes;
const value = updater(attributes[name]);
attributes[name] = value;
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'set',
attributes: data.attributes,
name
});
return this;
};
}
function attachNodeAttributeRemover(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, name] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
delete data.attributes[name];
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'remove',
attributes: data.attributes,
name
});
return this;
};
}
function attachNodeAttributesReplacer(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, attributes] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided attributes are not a plain object.`
);
data.attributes = attributes;
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'replace',
attributes: data.attributes
});
return this;
};
}
function attachNodeAttributesMerger(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, attributes] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided attributes are not a plain object.`
);
assign(data.attributes, attributes);
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'merge',
attributes: data.attributes,
data: attributes
});
return this;
};
}
function attachNodeAttributesUpdater(Class, method, mode) {
Class.prototype[method] = function (nodeOrEdge, nameOrEdge, add1) {
const [data, updater] = findRelevantNodeData(
this,
method,
mode,
nodeOrEdge,
nameOrEdge,
add1
);
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided updater is not a function.`
);
data.attributes = updater(data.attributes);
// Emitting
this.emit('nodeAttributesUpdated', {
key: data.key,
type: 'update',
attributes: data.attributes
});
return this;
};
}
/**
* List of methods to attach.
*/
const NODE_ATTRIBUTES_METHODS = [
{
name: element => `get${element}Attribute`,
attacher: attachNodeAttributeGetter
},
{
name: element => `get${element}Attributes`,
attacher: attachNodeAttributesGetter
},
{
name: element => `has${element}Attribute`,
attacher: attachNodeAttributeChecker
},
{
name: element => `set${element}Attribute`,
attacher: attachNodeAttributeSetter
},
{
name: element => `update${element}Attribute`,
attacher: attachNodeAttributeUpdater
},
{
name: element => `remove${element}Attribute`,
attacher: attachNodeAttributeRemover
},
{
name: element => `replace${element}Attributes`,
attacher: attachNodeAttributesReplacer
},
{
name: element => `merge${element}Attributes`,
attacher: attachNodeAttributesMerger
},
{
name: element => `update${element}Attributes`,
attacher: attachNodeAttributesUpdater
}
];
/**
* Attach every attributes-related methods to a Graph class.
*
* @param {function} Graph - Target class.
*/
function attachNodeAttributesMethods(Graph) {
NODE_ATTRIBUTES_METHODS.forEach(function ({name, attacher}) {
// For nodes
attacher(Graph, name('Node'), NODE);
// For sources
attacher(Graph, name('Source'), SOURCE);
// For targets
attacher(Graph, name('Target'), TARGET);
// For opposites
attacher(Graph, name('Opposite'), OPPOSITE);
});
}
/**
* Graphology Edge Attributes methods
* ===================================
*/
/**
* Attach an attribute getter method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributeGetter(Class, method, type) {
/**
* Get the desired attribute for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {string} name - Attribute's name.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {string} name - Attribute's name.
*
* @return {mixed} - The attribute's value.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, name) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element;
const target = '' + name;
name = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
return data.attributes[name];
};
}
/**
* Attach an attributes getter method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributesGetter(Class, method, type) {
/**
* Retrieves all the target element's attributes.
*
* Arity 2:
* @param {any} element - Target element.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
*
* @return {object} - The element's attributes.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 1) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element,
target = '' + arguments[1];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
return data.attributes;
};
}
/**
* Attach an attribute checker method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributeChecker(Class, method, type) {
/**
* Checks whether the desired attribute is set for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {string} name - Attribute's name.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {string} name - Attribute's name.
*
* @return {boolean}
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, name) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element;
const target = '' + name;
name = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
return data.attributes.hasOwnProperty(name);
};
}
/**
* Attach an attribute setter method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributeSetter(Class, method, type) {
/**
* Set the desired attribute for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {string} name - Attribute's name.
* @param {mixed} value - New attribute value.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {string} name - Attribute's name.
* @param {mixed} value - New attribute value.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, name, value) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 3) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element;
const target = '' + name;
name = arguments[2];
value = arguments[3];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
data.attributes[name] = value;
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'set',
attributes: data.attributes,
name
});
return this;
};
}
/**
* Attach an attribute updater method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributeUpdater(Class, method, type) {
/**
* Update the desired attribute for the given element (node or edge) using
* the provided function.
*
* Arity 2:
* @param {any} element - Target element.
* @param {string} name - Attribute's name.
* @param {function} updater - Updater function.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {string} name - Attribute's name.
* @param {function} updater - Updater function.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, name, updater) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 3) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element;
const target = '' + name;
name = arguments[2];
updater = arguments[3];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.${method}: updater should be a function.`
);
data.attributes[name] = updater(data.attributes[name]);
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'set',
attributes: data.attributes,
name
});
return this;
};
}
/**
* Attach an attribute remover method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributeRemover(Class, method, type) {
/**
* Remove the desired attribute for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {string} name - Attribute's name.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {string} name - Attribute's name.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, name) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element;
const target = '' + name;
name = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
delete data.attributes[name];
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'remove',
attributes: data.attributes,
name
});
return this;
};
}
/**
* Attach an attribute replacer method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributesReplacer(Class, method, type) {
/**
* Replace the attributes for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {object} attributes - New attributes.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {object} attributes - New attributes.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, attributes) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element,
target = '' + attributes;
attributes = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided attributes are not a plain object.`
);
data.attributes = attributes;
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'replace',
attributes: data.attributes
});
return this;
};
}
/**
* Attach an attribute merger method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributesMerger(Class, method, type) {
/**
* Merge the attributes for the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {object} attributes - Attributes to merge.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {object} attributes - Attributes to merge.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, attributes) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element,
target = '' + attributes;
attributes = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided attributes are not a plain object.`
);
assign(data.attributes, attributes);
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'merge',
attributes: data.attributes,
data: attributes
});
return this;
};
}
/**
* Attach an attribute updater method onto the provided class.
*
* @param {function} Class - Target class.
* @param {string} method - Method name.
* @param {string} type - Type of the edge to find.
*/
function attachEdgeAttributesUpdater(Class, method, type) {
/**
* Update the attributes of the given element (node or edge).
*
* Arity 2:
* @param {any} element - Target element.
* @param {function} updater - Updater function.
*
* Arity 3 (only for edges):
* @param {any} source - Source element.
* @param {any} target - Target element.
* @param {function} updater - Updater function.
*
* @return {Graph} - Returns itself for chaining.
*
* @throws {Error} - Will throw if too many arguments are provided.
* @throws {Error} - Will throw if any of the elements is not found.
*/
Class.prototype[method] = function (element, updater) {
let data;
if (this.type !== 'mixed' && type !== 'mixed' && type !== this.type)
throw new UsageGraphError(
`Graph.${method}: cannot find this type of edges in your ${this.type} graph.`
);
if (arguments.length > 2) {
if (this.multi)
throw new UsageGraphError(
`Graph.${method}: cannot use a {source,target} combo when asking about an edge's attributes in a MultiGraph since we cannot infer the one you want information about.`
);
const source = '' + element,
target = '' + updater;
updater = arguments[2];
data = getMatchingEdge(this, source, target, type);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find an edge for the given path ("${source}" - "${target}").`
);
} else {
if (type !== 'mixed')
throw new UsageGraphError(
`Graph.${method}: calling this method with only a key (vs. a source and target) does not make sense since an edge with this key could have the other type.`
);
element = '' + element;
data = this._edges.get(element);
if (!data)
throw new NotFoundGraphError(
`Graph.${method}: could not find the "${element}" edge in the graph.`
);
}
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.${method}: provided updater is not a function.`
);
data.attributes = updater(data.attributes);
// Emitting
this.emit('edgeAttributesUpdated', {
key: data.key,
type: 'update',
attributes: data.attributes
});
return this;
};
}
/**
* List of methods to attach.
*/
const EDGE_ATTRIBUTES_METHODS = [
{
name: element => `get${element}Attribute`,
attacher: attachEdgeAttributeGetter
},
{
name: element => `get${element}Attributes`,
attacher: attachEdgeAttributesGetter
},
{
name: element => `has${element}Attribute`,
attacher: attachEdgeAttributeChecker
},
{
name: element => `set${element}Attribute`,
attacher: attachEdgeAttributeSetter
},
{
name: element => `update${element}Attribute`,
attacher: attachEdgeAttributeUpdater
},
{
name: element => `remove${element}Attribute`,
attacher: attachEdgeAttributeRemover
},
{
name: element => `replace${element}Attributes`,
attacher: attachEdgeAttributesReplacer
},
{
name: element => `merge${element}Attributes`,
attacher: attachEdgeAttributesMerger
},
{
name: element => `update${element}Attributes`,
attacher: attachEdgeAttributesUpdater
}
];
/**
* Attach every attributes-related methods to a Graph class.
*
* @param {function} Graph - Target class.
*/
function attachEdgeAttributesMethods(Graph) {
EDGE_ATTRIBUTES_METHODS.forEach(function ({name, attacher}) {
// For edges
attacher(Graph, name('Edge'), 'mixed');
// For directed edges
attacher(Graph, name('DirectedEdge'), 'directed');
// For undirected edges
attacher(Graph, name('UndirectedEdge'), 'undirected');
});
}
/**
* Graphology Edge Iteration
* ==========================
*
* Attaching some methods to the Graph class to be able to iterate over a
* graph's edges.
*/
/**
* Definitions.
*/
const EDGES_ITERATION = [
{
name: 'edges',
type: 'mixed'
},
{
name: 'inEdges',
type: 'directed',
direction: 'in'
},
{
name: 'outEdges',
type: 'directed',
direction: 'out'
},
{
name: 'inboundEdges',
type: 'mixed',
direction: 'in'
},
{
name: 'outboundEdges',
type: 'mixed',
direction: 'out'
},
{
name: 'directedEdges',
type: 'directed'
},
{
name: 'undirectedEdges',
type: 'undirected'
}
];
/**
* Function iterating over edges from the given object to match one of them.
*
* @param {object} object - Target object.
* @param {function} callback - Function to call.
*/
function forEachSimple(breakable, object, callback, avoid) {
let shouldBreak = false;
for (const k in object) {
if (k === avoid) continue;
const edgeData = object[k];
shouldBreak = callback(
edgeData.key,
edgeData.attributes,
edgeData.source.key,
edgeData.target.key,
edgeData.source.attributes,
edgeData.target.attributes,
edgeData.undirected
);
if (breakable && shouldBreak) return edgeData.key;
}
return;
}
function forEachMulti(breakable, object, callback, avoid) {
let edgeData, source, target;
let shouldBreak = false;
for (const k in object) {
if (k === avoid) continue;
edgeData = object[k];
do {
source = edgeData.source;
target = edgeData.target;
shouldBreak = callback(
edgeData.key,
edgeData.attributes,
source.key,
target.key,
source.attributes,
target.attributes,
edgeData.undirected
);
if (breakable && shouldBreak) return edgeData.key;
edgeData = edgeData.next;
} while (edgeData !== undefined);
}
return;
}
/**
* Function returning an iterator over edges from the given object.
*
* @param {object} object - Target object.
* @return {Iterator}
*/
function createIterator(object, avoid) {
const keys = Object.keys(object);
const l = keys.length;
let edgeData;
let i = 0;
return new Iterator(function next() {
do {
if (!edgeData) {
if (i >= l) return {done: true};
const k = keys[i++];
if (k === avoid) {
edgeData = undefined;
continue;
}
edgeData = object[k];
} else {
edgeData = edgeData.next;
}
} while (!edgeData);
return {
done: false,
value: {
edge: edgeData.key,
attributes: edgeData.attributes,
source: edgeData.source.key,
target: edgeData.target.key,
sourceAttributes: edgeData.source.attributes,
targetAttributes: edgeData.target.attributes,
undirected: edgeData.undirected
}
};
});
}
/**
* Function iterating over the egdes from the object at given key to match
* one of them.
*
* @param {object} object - Target object.
* @param {mixed} k - Neighbor key.
* @param {function} callback - Callback to use.
*/
function forEachForKeySimple(breakable, object, k, callback) {
const edgeData = object[k];
if (!edgeData) return;
const sourceData = edgeData.source;
const targetData = edgeData.target;
if (
callback(
edgeData.key,
edgeData.attributes,
sourceData.key,
targetData.key,
sourceData.attributes,
targetData.attributes,
edgeData.undirected
) &&
breakable
)
return edgeData.key;
}
function forEachForKeyMulti(breakable, object, k, callback) {
let edgeData = object[k];
if (!edgeData) return;
let shouldBreak = false;
do {
shouldBreak = callback(
edgeData.key,
edgeData.attributes,
edgeData.source.key,
edgeData.target.key,
edgeData.source.attributes,
edgeData.target.attributes,
edgeData.undirected
);
if (breakable && shouldBreak) return edgeData.key;
edgeData = edgeData.next;
} while (edgeData !== undefined);
return;
}
/**
* Function returning an iterator over the egdes from the object at given key.
*
* @param {object} object - Target object.
* @param {mixed} k - Neighbor key.
* @return {Iterator}
*/
function createIteratorForKey(object, k) {
let edgeData = object[k];
if (edgeData.next !== undefined) {
return new Iterator(function () {
if (!edgeData) return {done: true};
const value = {
edge: edgeData.key,
attributes: edgeData.attributes,
source: edgeData.source.key,
target: edgeData.target.key,
sourceAttributes: edgeData.source.attributes,
targetAttributes: edgeData.target.attributes,
undirected: edgeData.undirected
};
edgeData = edgeData.next;
return {
done: false,
value
};
});
}
return Iterator.of({
edge: edgeData.key,
attributes: edgeData.attributes,
source: edgeData.source.key,
target: edgeData.target.key,
sourceAttributes: edgeData.source.attributes,
targetAttributes: edgeData.target.attributes,
undirected: edgeData.undirected
});
}
/**
* Function creating an array of edges for the given type.
*
* @param {Graph} graph - Target Graph instance.
* @param {string} type - Type of edges to retrieve.
* @return {array} - Array of edges.
*/
function createEdgeArray(graph, type) {
if (graph.size === 0) return [];
if (type === 'mixed' || type === graph.type) {
if (typeof Array.from === 'function')
return Array.from(graph._edges.keys());
return take(graph._edges.keys(), graph._edges.size);
}
const size =
type === 'undirected' ? graph.undirectedSize : graph.directedSize;
const list = new Array(size),
mask = type === 'undirected';
const iterator = graph._edges.values();
let i = 0;
let step, data;
while (((step = iterator.next()), step.done !== true)) {
data = step.value;
if (data.undirected === mask) list[i++] = data.key;
}
return list;
}
/**
* Function iterating over a graph's edges using a callback to match one of
* them.
*
* @param {Graph} graph - Target Graph instance.
* @param {string} type - Type of edges to retrieve.
* @param {function} callback - Function to call.
*/
function forEachEdge(breakable, graph, type, callback) {
if (graph.size === 0) return;
const shouldFilter = type !== 'mixed' && type !== graph.type;
const mask = type === 'undirected';
let step, data;
let shouldBreak = false;
const iterator = graph._edges.values();
while (((step = iterator.next()), step.done !== true)) {
data = step.value;
if (shouldFilter && data.undirected !== mask) continue;
const {key, attributes, source, target} = data;
shouldBreak = callback(
key,
attributes,
source.key,
target.key,
source.attributes,
target.attributes,
data.undirected
);
if (breakable && shouldBreak) return key;
}
return;
}
/**
* Function creating an iterator of edges for the given type.
*
* @param {Graph} graph - Target Graph instance.
* @param {string} type - Type of edges to retrieve.
* @return {Iterator}
*/
function createEdgeIterator(graph, type) {
if (graph.size === 0) return Iterator.empty();
const shouldFilter = type !== 'mixed' && type !== graph.type;
const mask = type === 'undirected';
const iterator = graph._edges.values();
return new Iterator(function next() {
let step, data;
// eslint-disable-next-line no-constant-condition
while (true) {
step = iterator.next();
if (step.done) return step;
data = step.value;
if (shouldFilter && data.undirected !== mask) continue;
break;
}
const value = {
edge: data.key,
attributes: data.attributes,
source: data.source.key,
target: data.target.key,
sourceAttributes: data.source.attributes,
targetAttributes: data.target.attributes,
undirected: data.undirected
};
return {value, done: false};
});
}
/**
* Function iterating over a node's edges using a callback to match one of them.
*
* @param {boolean} multi - Whether the graph is multi or not.
* @param {string} type - Type of edges to retrieve.
* @param {string} direction - In or out?
* @param {any} nodeData - Target node's data.
* @param {function} callback - Function to call.
*/
function forEachEdgeForNode(
breakable,
multi,
type,
direction,
nodeData,
callback
) {
const fn = multi ? forEachMulti : forEachSimple;
let found;
if (type !== 'undirected') {
if (direction !== 'out') {
found = fn(breakable, nodeData.in, callback);
if (breakable && found) return found;
}
if (direction !== 'in') {
found = fn(
breakable,
nodeData.out,
callback,
!direction ? nodeData.key : undefined
);
if (breakable && found) return found;
}
}
if (type !== 'directed') {
found = fn(breakable, nodeData.undirected, callback);
if (breakable && found) return found;
}
return;
}
/**
* Function creating an array of edges for the given type & the given node.
*
* @param {boolean} multi - Whether the graph is multi or not.
* @param {string} type - Type of edges to retrieve.
* @param {string} direction - In or out?
* @param {any} nodeData - Target node's data.
* @return {array} - Array of edges.
*/
function createEdgeArrayForNode(multi, type, direction, nodeData) {
const edges = []; // TODO: possibility to know size beforehand or factorize with map
forEachEdgeForNode(false, multi, type, direction, nodeData, function (key) {
edges.push(key);
});
return edges;
}
/**
* Function iterating over a node's edges using a callback.
*
* @param {string} type - Type of edges to retrieve.
* @param {string} direction - In or out?
* @param {any} nodeData - Target node's data.
* @return {Iterator}
*/
function createEdgeIteratorForNode(type, direction, nodeData) {
let iterator = Iterator.empty();
if (type !== 'undirected') {
if (direction !== 'out' && typeof nodeData.in !== 'undefined')
iterator = chain(iterator, createIterator(nodeData.in));
if (direction !== 'in' && typeof nodeData.out !== 'undefined')
iterator = chain(
iterator,
createIterator(nodeData.out, !direction ? nodeData.key : undefined)
);
}
if (type !== 'directed' && typeof nodeData.undirected !== 'undefined') {
iterator = chain(iterator, createIterator(nodeData.undirected));
}
return iterator;
}
/**
* Function iterating over edges for the given path using a callback to match
* one of them.
*
* @param {string} type - Type of edges to retrieve.
* @param {boolean} multi - Whether the graph is multi.
* @param {string} direction - In or out?
* @param {NodeData} sourceData - Source node's data.
* @param {string} target - Target node.
* @param {function} callback - Function to call.
*/
function forEachEdgeForPath(
breakable,
type,
multi,
direction,
sourceData,
target,
callback
) {
const fn = multi ? forEachForKeyMulti : forEachForKeySimple;
let found;
if (type !== 'undirected') {
if (typeof sourceData.in !== 'undefined' && direction !== 'out') {
found = fn(breakable, sourceData.in, target, callback);
if (breakable && found) return found;
}
if (
typeof sourceData.out !== 'undefined' &&
direction !== 'in' &&
(direction || sourceData.key !== target)
) {
found = fn(breakable, sourceData.out, target, callback);
if (breakable && found) return found;
}
}
if (type !== 'directed') {
if (typeof sourceData.undirected !== 'undefined') {
found = fn(breakable, sourceData.undirected, target, callback);
if (breakable && found) return found;
}
}
return;
}
/**
* Function creating an array of edges for the given path.
*
* @param {string} type - Type of edges to retrieve.
* @param {boolean} multi - Whether the graph is multi.
* @param {string} direction - In or out?
* @param {NodeData} sourceData - Source node's data.
* @param {any} target - Target node.
* @return {array} - Array of edges.
*/
function createEdgeArrayForPath(type, multi, direction, sourceData, target) {
const edges = []; // TODO: possibility to know size beforehand or factorize with map
forEachEdgeForPath(
false,
type,
multi,
direction,
sourceData,
target,
function (key) {
edges.push(key);
}
);
return edges;
}
/**
* Function returning an iterator over edges for the given path.
*
* @param {string} type - Type of edges to retrieve.
* @param {string} direction - In or out?
* @param {NodeData} sourceData - Source node's data.
* @param {string} target - Target node.
* @param {function} callback - Function to call.
*/
function createEdgeIteratorForPath(type, direction, sourceData, target) {
let iterator = Iterator.empty();
if (type !== 'undirected') {
if (
typeof sourceData.in !== 'undefined' &&
direction !== 'out' &&
target in sourceData.in
)
iterator = chain(iterator, createIteratorForKey(sourceData.in, target));
if (
typeof sourceData.out !== 'undefined' &&
direction !== 'in' &&
target in sourceData.out &&
(direction || sourceData.key !== target)
)
iterator = chain(iterator, createIteratorForKey(sourceData.out, target));
}
if (type !== 'directed') {
if (
typeof sourceData.undirected !== 'undefined' &&
target in sourceData.undirected
)
iterator = chain(
iterator,
createIteratorForKey(sourceData.undirected, target)
);
}
return iterator;
}
/**
* Function attaching an edge array creator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachEdgeArrayCreator(Class, description) {
const {name, type, direction} = description;
/**
* Function returning an array of certain edges.
*
* Arity 0: Return all the relevant edges.
*
* Arity 1: Return all of a node's relevant edges.
* @param {any} node - Target node.
*
* Arity 2: Return the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
*
* @return {array|number} - The edges or the number of edges.
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[name] = function (source, target) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type)
return [];
if (!arguments.length) return createEdgeArray(this, type);
if (arguments.length === 1) {
source = '' + source;
const nodeData = this._nodes.get(source);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${source}" node in the graph.`
);
// Iterating over a node's edges
return createEdgeArrayForNode(
this.multi,
type === 'mixed' ? this.type : type,
direction,
nodeData
);
}
if (arguments.length === 2) {
source = '' + source;
target = '' + target;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${target}" target node in the graph.`
);
// Iterating over the edges between source & target
return createEdgeArrayForPath(
type,
this.multi,
direction,
sourceData,
target
);
}
throw new InvalidArgumentsGraphError(
`Graph.${name}: too many arguments (expecting 0, 1 or 2 and got ${arguments.length}).`
);
};
}
/**
* Function attaching a edge callback iterator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachForEachEdge(Class, description) {
const {name, type, direction} = description;
const forEachName = 'forEach' + name[0].toUpperCase() + name.slice(1, -1);
/**
* Function iterating over the graph's relevant edges by applying the given
* callback.
*
* Arity 1: Iterate over all the relevant edges.
* @param {function} callback - Callback to use.
*
* Arity 2: Iterate over all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* Arity 3: Iterate over the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} callback - Callback to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[forEachName] = function (source, target, callback) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type) return;
if (arguments.length === 1) {
callback = source;
return forEachEdge(false, this, type, callback);
}
if (arguments.length === 2) {
source = '' + source;
callback = target;
const nodeData = this._nodes.get(source);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${forEachName}: could not find the "${source}" node in the graph.`
);
// Iterating over a node's edges
// TODO: maybe attach the sub method to the instance dynamically?
return forEachEdgeForNode(
false,
this.multi,
type === 'mixed' ? this.type : type,
direction,
nodeData,
callback
);
}
if (arguments.length === 3) {
source = '' + source;
target = '' + target;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${forEachName}: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.${forEachName}: could not find the "${target}" target node in the graph.`
);
// Iterating over the edges between source & target
return forEachEdgeForPath(
false,
type,
this.multi,
direction,
sourceData,
target,
callback
);
}
throw new InvalidArgumentsGraphError(
`Graph.${forEachName}: too many arguments (expecting 1, 2 or 3 and got ${arguments.length}).`
);
};
/**
* Function mapping the graph's relevant edges by applying the given
* callback.
*
* Arity 1: Map all the relevant edges.
* @param {function} callback - Callback to use.
*
* Arity 2: Map all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* Arity 3: Map the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} callback - Callback to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const mapName = 'map' + name[0].toUpperCase() + name.slice(1);
Class.prototype[mapName] = function () {
const args = Array.prototype.slice.call(arguments);
const callback = args.pop();
let result;
// We know the result length beforehand
if (args.length === 0) {
let length = 0;
if (type !== 'directed') length += this.undirectedSize;
if (type !== 'undirected') length += this.directedSize;
result = new Array(length);
let i = 0;
args.push((e, ea, s, t, sa, ta, u) => {
result[i++] = callback(e, ea, s, t, sa, ta, u);
});
}
// We don't know the result length beforehand
// TODO: we can in some instances of simple graphs, knowing degree
else {
result = [];
args.push((e, ea, s, t, sa, ta, u) => {
result.push(callback(e, ea, s, t, sa, ta, u));
});
}
this[forEachName].apply(this, args);
return result;
};
/**
* Function filtering the graph's relevant edges using the provided predicate
* function.
*
* Arity 1: Filter all the relevant edges.
* @param {function} predicate - Predicate to use.
*
* Arity 2: Filter all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} predicate - Predicate to use.
*
* Arity 3: Filter the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} predicate - Predicate to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const filterName = 'filter' + name[0].toUpperCase() + name.slice(1);
Class.prototype[filterName] = function () {
const args = Array.prototype.slice.call(arguments);
const callback = args.pop();
const result = [];
args.push((e, ea, s, t, sa, ta, u) => {
if (callback(e, ea, s, t, sa, ta, u)) result.push(e);
});
this[forEachName].apply(this, args);
return result;
};
/**
* Function reducing the graph's relevant edges using the provided accumulator
* function.
*
* Arity 1: Reduce all the relevant edges.
* @param {function} accumulator - Accumulator to use.
* @param {any} initialValue - Initial value.
*
* Arity 2: Reduce all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} accumulator - Accumulator to use.
* @param {any} initialValue - Initial value.
*
* Arity 3: Reduce the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} accumulator - Accumulator to use.
* @param {any} initialValue - Initial value.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const reduceName = 'reduce' + name[0].toUpperCase() + name.slice(1);
Class.prototype[reduceName] = function () {
let args = Array.prototype.slice.call(arguments);
if (args.length < 2 || args.length > 4) {
throw new InvalidArgumentsGraphError(
`Graph.${reduceName}: invalid number of arguments (expecting 2, 3 or 4 and got ${args.length}).`
);
}
if (
typeof args[args.length - 1] === 'function' &&
typeof args[args.length - 2] !== 'function'
) {
throw new InvalidArgumentsGraphError(
`Graph.${reduceName}: missing initial value. You must provide it because the callback takes more than one argument and we cannot infer the initial value from the first iteration, as you could with a simple array.`
);
}
let callback;
let initialValue;
if (args.length === 2) {
callback = args[0];
initialValue = args[1];
args = [];
} else if (args.length === 3) {
callback = args[1];
initialValue = args[2];
args = [args[0]];
} else if (args.length === 4) {
callback = args[2];
initialValue = args[3];
args = [args[0], args[1]];
}
let accumulator = initialValue;
args.push((e, ea, s, t, sa, ta, u) => {
accumulator = callback(accumulator, e, ea, s, t, sa, ta, u);
});
this[forEachName].apply(this, args);
return accumulator;
};
}
/**
* Function attaching a breakable edge callback iterator method to the Graph
* prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachFindEdge(Class, description) {
const {name, type, direction} = description;
const findEdgeName = 'find' + name[0].toUpperCase() + name.slice(1, -1);
/**
* Function iterating over the graph's relevant edges in order to match
* one of them using the provided predicate function.
*
* Arity 1: Iterate over all the relevant edges.
* @param {function} callback - Callback to use.
*
* Arity 2: Iterate over all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* Arity 3: Iterate over the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} callback - Callback to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[findEdgeName] = function (source, target, callback) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type)
return false;
if (arguments.length === 1) {
callback = source;
return forEachEdge(true, this, type, callback);
}
if (arguments.length === 2) {
source = '' + source;
callback = target;
const nodeData = this._nodes.get(source);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${findEdgeName}: could not find the "${source}" node in the graph.`
);
// Iterating over a node's edges
// TODO: maybe attach the sub method to the instance dynamically?
return forEachEdgeForNode(
true,
this.multi,
type === 'mixed' ? this.type : type,
direction,
nodeData,
callback
);
}
if (arguments.length === 3) {
source = '' + source;
target = '' + target;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${findEdgeName}: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.${findEdgeName}: could not find the "${target}" target node in the graph.`
);
// Iterating over the edges between source & target
return forEachEdgeForPath(
true,
type,
this.multi,
direction,
sourceData,
target,
callback
);
}
throw new InvalidArgumentsGraphError(
`Graph.${findEdgeName}: too many arguments (expecting 1, 2 or 3 and got ${arguments.length}).`
);
};
/**
* Function iterating over the graph's relevant edges in order to assert
* whether any one of them matches the provided predicate function.
*
* Arity 1: Iterate over all the relevant edges.
* @param {function} callback - Callback to use.
*
* Arity 2: Iterate over all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* Arity 3: Iterate over the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} callback - Callback to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const someName = 'some' + name[0].toUpperCase() + name.slice(1, -1);
Class.prototype[someName] = function () {
const args = Array.prototype.slice.call(arguments);
const callback = args.pop();
args.push((e, ea, s, t, sa, ta, u) => {
return callback(e, ea, s, t, sa, ta, u);
});
const found = this[findEdgeName].apply(this, args);
if (found) return true;
return false;
};
/**
* Function iterating over the graph's relevant edges in order to assert
* whether all of them matche the provided predicate function.
*
* Arity 1: Iterate over all the relevant edges.
* @param {function} callback - Callback to use.
*
* Arity 2: Iterate over all of a node's relevant edges.
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* Arity 3: Iterate over the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
* @param {function} callback - Callback to use.
*
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const everyName = 'every' + name[0].toUpperCase() + name.slice(1, -1);
Class.prototype[everyName] = function () {
const args = Array.prototype.slice.call(arguments);
const callback = args.pop();
args.push((e, ea, s, t, sa, ta, u) => {
return !callback(e, ea, s, t, sa, ta, u);
});
const found = this[findEdgeName].apply(this, args);
if (found) return false;
return true;
};
}
/**
* Function attaching an edge iterator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachEdgeIteratorCreator(Class, description) {
const {name: originalName, type, direction} = description;
const name = originalName.slice(0, -1) + 'Entries';
/**
* Function returning an iterator over the graph's edges.
*
* Arity 0: Iterate over all the relevant edges.
*
* Arity 1: Iterate over all of a node's relevant edges.
* @param {any} node - Target node.
*
* Arity 2: Iterate over the relevant edges across the given path.
* @param {any} source - Source node.
* @param {any} target - Target node.
*
* @return {array|number} - The edges or the number of edges.
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[name] = function (source, target) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type)
return Iterator.empty();
if (!arguments.length) return createEdgeIterator(this, type);
if (arguments.length === 1) {
source = '' + source;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${source}" node in the graph.`
);
// Iterating over a node's edges
return createEdgeIteratorForNode(type, direction, sourceData);
}
if (arguments.length === 2) {
source = '' + source;
target = '' + target;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${target}" target node in the graph.`
);
// Iterating over the edges between source & target
return createEdgeIteratorForPath(type, direction, sourceData, target);
}
throw new InvalidArgumentsGraphError(
`Graph.${name}: too many arguments (expecting 0, 1 or 2 and got ${arguments.length}).`
);
};
}
/**
* Function attaching every edge iteration method to the Graph class.
*
* @param {function} Graph - Graph class.
*/
function attachEdgeIterationMethods(Graph) {
EDGES_ITERATION.forEach(description => {
attachEdgeArrayCreator(Graph, description);
attachForEachEdge(Graph, description);
attachFindEdge(Graph, description);
attachEdgeIteratorCreator(Graph, description);
});
}
/**
* Graphology Neighbor Iteration
* ==============================
*
* Attaching some methods to the Graph class to be able to iterate over
* neighbors.
*/
/**
* Definitions.
*/
const NEIGHBORS_ITERATION = [
{
name: 'neighbors',
type: 'mixed'
},
{
name: 'inNeighbors',
type: 'directed',
direction: 'in'
},
{
name: 'outNeighbors',
type: 'directed',
direction: 'out'
},
{
name: 'inboundNeighbors',
type: 'mixed',
direction: 'in'
},
{
name: 'outboundNeighbors',
type: 'mixed',
direction: 'out'
},
{
name: 'directedNeighbors',
type: 'directed'
},
{
name: 'undirectedNeighbors',
type: 'undirected'
}
];
/**
* Helpers.
*/
function CompositeSetWrapper() {
this.A = null;
this.B = null;
}
CompositeSetWrapper.prototype.wrap = function (set) {
if (this.A === null) this.A = set;
else if (this.B === null) this.B = set;
};
CompositeSetWrapper.prototype.has = function (key) {
if (this.A !== null && key in this.A) return true;
if (this.B !== null && key in this.B) return true;
return false;
};
/**
* Function iterating over the given node's relevant neighbors to match
* one of them using a predicated function.
*
* @param {string} type - Type of neighbors.
* @param {string} direction - Direction.
* @param {any} nodeData - Target node's data.
* @param {function} callback - Callback to use.
*/
function forEachInObjectOnce(breakable, visited, nodeData, object, callback) {
for (const k in object) {
const edgeData = object[k];
const sourceData = edgeData.source;
const targetData = edgeData.target;
const neighborData = sourceData === nodeData ? targetData : sourceData;
if (visited && visited.has(neighborData.key)) continue;
const shouldBreak = callback(neighborData.key, neighborData.attributes);
if (breakable && shouldBreak) return neighborData.key;
}
return;
}
function forEachNeighbor(breakable, type, direction, nodeData, callback) {
// If we want only undirected or in or out, we can roll some optimizations
if (type !== 'mixed') {
if (type === 'undirected')
return forEachInObjectOnce(
breakable,
null,
nodeData,
nodeData.undirected,
callback
);
if (typeof direction === 'string')
return forEachInObjectOnce(
breakable,
null,
nodeData,
nodeData[direction],
callback
);
}
// Else we need to keep a set of neighbors not to return duplicates
// We cheat by querying the other adjacencies
const visited = new CompositeSetWrapper();
let found;
if (type !== 'undirected') {
if (direction !== 'out') {
found = forEachInObjectOnce(
breakable,
null,
nodeData,
nodeData.in,
callback
);
if (breakable && found) return found;
visited.wrap(nodeData.in);
}
if (direction !== 'in') {
found = forEachInObjectOnce(
breakable,
visited,
nodeData,
nodeData.out,
callback
);
if (breakable && found) return found;
visited.wrap(nodeData.out);
}
}
if (type !== 'directed') {
found = forEachInObjectOnce(
breakable,
visited,
nodeData,
nodeData.undirected,
callback
);
if (breakable && found) return found;
}
return;
}
/**
* Function creating an array of relevant neighbors for the given node.
*
* @param {string} type - Type of neighbors.
* @param {string} direction - Direction.
* @param {any} nodeData - Target node's data.
* @return {Array} - The list of neighbors.
*/
function createNeighborArrayForNode(type, direction, nodeData) {
// If we want only undirected or in or out, we can roll some optimizations
if (type !== 'mixed') {
if (type === 'undirected') return Object.keys(nodeData.undirected);
if (typeof direction === 'string') return Object.keys(nodeData[direction]);
}
const neighbors = [];
forEachNeighbor(false, type, direction, nodeData, function (key) {
neighbors.push(key);
});
return neighbors;
}
/**
* Function returning an iterator over the given node's relevant neighbors.
*
* @param {string} type - Type of neighbors.
* @param {string} direction - Direction.
* @param {any} nodeData - Target node's data.
* @return {Iterator}
*/
function createDedupedObjectIterator(visited, nodeData, object) {
const keys = Object.keys(object);
const l = keys.length;
let i = 0;
return new Iterator(function next() {
let neighborData = null;
do {
if (i >= l) {
if (visited) visited.wrap(object);
return {done: true};
}
const edgeData = object[keys[i++]];
const sourceData = edgeData.source;
const targetData = edgeData.target;
neighborData = sourceData === nodeData ? targetData : sourceData;
if (visited && visited.has(neighborData.key)) {
neighborData = null;
continue;
}
} while (neighborData === null);
return {
done: false,
value: {neighbor: neighborData.key, attributes: neighborData.attributes}
};
});
}
function createNeighborIterator(type, direction, nodeData) {
// If we want only undirected or in or out, we can roll some optimizations
if (type !== 'mixed') {
if (type === 'undirected')
return createDedupedObjectIterator(null, nodeData, nodeData.undirected);
if (typeof direction === 'string')
return createDedupedObjectIterator(null, nodeData, nodeData[direction]);
}
let iterator = Iterator.empty();
// Else we need to keep a set of neighbors not to return duplicates
// We cheat by querying the other adjacencies
const visited = new CompositeSetWrapper();
if (type !== 'undirected') {
if (direction !== 'out') {
iterator = chain(
iterator,
createDedupedObjectIterator(visited, nodeData, nodeData.in)
);
}
if (direction !== 'in') {
iterator = chain(
iterator,
createDedupedObjectIterator(visited, nodeData, nodeData.out)
);
}
}
if (type !== 'directed') {
iterator = chain(
iterator,
createDedupedObjectIterator(visited, nodeData, nodeData.undirected)
);
}
return iterator;
}
/**
* Function attaching a neighbors array creator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachNeighborArrayCreator(Class, description) {
const {name, type, direction} = description;
/**
* Function returning an array of certain neighbors.
*
* @param {any} node - Target node.
* @return {array} - The neighbors of neighbors.
*
* @throws {Error} - Will throw if node is not found in the graph.
*/
Class.prototype[name] = function (node) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type)
return [];
node = '' + node;
const nodeData = this._nodes.get(node);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${name}: could not find the "${node}" node in the graph.`
);
// Here, we want to iterate over a node's relevant neighbors
return createNeighborArrayForNode(
type === 'mixed' ? this.type : type,
direction,
nodeData
);
};
}
/**
* Function attaching a neighbors callback iterator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachForEachNeighbor(Class, description) {
const {name, type, direction} = description;
const forEachName = 'forEach' + name[0].toUpperCase() + name.slice(1, -1);
/**
* Function iterating over all the relevant neighbors using a callback.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[forEachName] = function (node, callback) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type) return;
node = '' + node;
const nodeData = this._nodes.get(node);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${forEachName}: could not find the "${node}" node in the graph.`
);
// Here, we want to iterate over a node's relevant neighbors
forEachNeighbor(
false,
type === 'mixed' ? this.type : type,
direction,
nodeData,
callback
);
};
/**
* Function mapping the relevant neighbors using a callback.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const mapName = 'map' + name[0].toUpperCase() + name.slice(1);
Class.prototype[mapName] = function (node, callback) {
// TODO: optimize when size is known beforehand
const result = [];
this[forEachName](node, (n, a) => {
result.push(callback(n, a));
});
return result;
};
/**
* Function filtering the relevant neighbors using a callback.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const filterName = 'filter' + name[0].toUpperCase() + name.slice(1);
Class.prototype[filterName] = function (node, callback) {
const result = [];
this[forEachName](node, (n, a) => {
if (callback(n, a)) result.push(n);
});
return result;
};
/**
* Function reducing the relevant neighbors using a callback.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const reduceName = 'reduce' + name[0].toUpperCase() + name.slice(1);
Class.prototype[reduceName] = function (node, callback, initialValue) {
if (arguments.length < 3)
throw new InvalidArgumentsGraphError(
`Graph.${reduceName}: missing initial value. You must provide it because the callback takes more than one argument and we cannot infer the initial value from the first iteration, as you could with a simple array.`
);
let accumulator = initialValue;
this[forEachName](node, (n, a) => {
accumulator = callback(accumulator, n, a);
});
return accumulator;
};
}
/**
* Function attaching a breakable neighbors callback iterator method to the
* Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachFindNeighbor(Class, description) {
const {name, type, direction} = description;
const capitalizedSingular = name[0].toUpperCase() + name.slice(1, -1);
const findName = 'find' + capitalizedSingular;
/**
* Function iterating over all the relevant neighbors using a callback.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
* @return {undefined}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[findName] = function (node, callback) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type) return;
node = '' + node;
const nodeData = this._nodes.get(node);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${findName}: could not find the "${node}" node in the graph.`
);
// Here, we want to iterate over a node's relevant neighbors
return forEachNeighbor(
true,
type === 'mixed' ? this.type : type,
direction,
nodeData,
callback
);
};
/**
* Function iterating over all the relevant neighbors to find if any of them
* matches the given predicate.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
* @return {boolean}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const someName = 'some' + capitalizedSingular;
Class.prototype[someName] = function (node, callback) {
const found = this[findName](node, callback);
if (found) return true;
return false;
};
/**
* Function iterating over all the relevant neighbors to find if all of them
* matche the given predicate.
*
* @param {any} node - Target node.
* @param {function} callback - Callback to use.
* @return {boolean}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
const everyName = 'every' + capitalizedSingular;
Class.prototype[everyName] = function (node, callback) {
const found = this[findName](node, (n, a) => {
return !callback(n, a);
});
if (found) return false;
return true;
};
}
/**
* Function attaching a neighbors callback iterator method to the Graph prototype.
*
* @param {function} Class - Target class.
* @param {object} description - Method description.
*/
function attachNeighborIteratorCreator(Class, description) {
const {name, type, direction} = description;
const iteratorName = name.slice(0, -1) + 'Entries';
/**
* Function returning an iterator over all the relevant neighbors.
*
* @param {any} node - Target node.
* @return {Iterator}
*
* @throws {Error} - Will throw if there are too many arguments.
*/
Class.prototype[iteratorName] = function (node) {
// Early termination
if (type !== 'mixed' && this.type !== 'mixed' && type !== this.type)
return Iterator.empty();
node = '' + node;
const nodeData = this._nodes.get(node);
if (typeof nodeData === 'undefined')
throw new NotFoundGraphError(
`Graph.${iteratorName}: could not find the "${node}" node in the graph.`
);
// Here, we want to iterate over a node's relevant neighbors
return createNeighborIterator(
type === 'mixed' ? this.type : type,
direction,
nodeData
);
};
}
/**
* Function attaching every neighbor iteration method to the Graph class.
*
* @param {function} Graph - Graph class.
*/
function attachNeighborIterationMethods(Graph) {
NEIGHBORS_ITERATION.forEach(description => {
attachNeighborArrayCreator(Graph, description);
attachForEachNeighbor(Graph, description);
attachFindNeighbor(Graph, description);
attachNeighborIteratorCreator(Graph, description);
});
}
/**
* Graphology Adjacency Iteration
* ===============================
*
* Attaching some methods to the Graph class to be able to iterate over a
* graph's adjacency.
*/
/**
* Function iterating over a simple graph's adjacency using a callback.
*
* @param {boolean} breakable - Can we break?
* @param {boolean} assymetric - Whether to emit undirected edges only once.
* @param {boolean} disconnectedNodes - Whether to emit disconnected nodes.
* @param {Graph} graph - Target Graph instance.
* @param {callback} function - Iteration callback.
*/
function forEachAdjacency(
breakable,
assymetric,
disconnectedNodes,
graph,
callback
) {
const iterator = graph._nodes.values();
const type = graph.type;
let step, sourceData, neighbor, adj, edgeData, targetData, shouldBreak;
while (((step = iterator.next()), step.done !== true)) {
let hasEdges = false;
sourceData = step.value;
if (type !== 'undirected') {
adj = sourceData.out;
for (neighbor in adj) {
edgeData = adj[neighbor];
do {
targetData = edgeData.target;
hasEdges = true;
shouldBreak = callback(
sourceData.key,
targetData.key,
sourceData.attributes,
targetData.attributes,
edgeData.key,
edgeData.attributes,
edgeData.undirected
);
if (breakable && shouldBreak) return edgeData;
edgeData = edgeData.next;
} while (edgeData);
}
}
if (type !== 'directed') {
adj = sourceData.undirected;
for (neighbor in adj) {
if (assymetric && sourceData.key > neighbor) continue;
edgeData = adj[neighbor];
do {
targetData = edgeData.target;
if (targetData.key !== neighbor) targetData = edgeData.source;
hasEdges = true;
shouldBreak = callback(
sourceData.key,
targetData.key,
sourceData.attributes,
targetData.attributes,
edgeData.key,
edgeData.attributes,
edgeData.undirected
);
if (breakable && shouldBreak) return edgeData;
edgeData = edgeData.next;
} while (edgeData);
}
}
if (disconnectedNodes && !hasEdges) {
shouldBreak = callback(
sourceData.key,
null,
sourceData.attributes,
null,
null,
null,
null
);
if (breakable && shouldBreak) return null;
}
}
return;
}
/**
* Graphology Serialization Utilities
* ===================================
*
* Collection of functions used by the graph serialization schemes.
*/
/**
* Formats internal node data into a serialized node.
*
* @param {any} key - The node's key.
* @param {object} data - Internal node's data.
* @return {array} - The serialized node.
*/
function serializeNode(key, data) {
const serialized = {key};
if (!isEmpty(data.attributes))
serialized.attributes = assign({}, data.attributes);
return serialized;
}
/**
* Formats internal edge data into a serialized edge.
*
* @param {string} type - The graph's type.
* @param {any} key - The edge's key.
* @param {object} data - Internal edge's data.
* @return {array} - The serialized edge.
*/
function serializeEdge(type, key, data) {
const serialized = {
key,
source: data.source.key,
target: data.target.key
};
if (!isEmpty(data.attributes))
serialized.attributes = assign({}, data.attributes);
if (type === 'mixed' && data.undirected) serialized.undirected = true;
return serialized;
}
/**
* Checks whether the given value is a serialized node.
*
* @param {mixed} value - Target value.
* @return {string|null}
*/
function validateSerializedNode(value) {
if (!isPlainObject(value))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid serialized node. A serialized node should be a plain object with at least a "key" property.'
);
if (!('key' in value))
throw new InvalidArgumentsGraphError(
'Graph.import: serialized node is missing its key.'
);
if (
'attributes' in value &&
(!isPlainObject(value.attributes) || value.attributes === null)
)
throw new InvalidArgumentsGraphError(
'Graph.import: invalid attributes. Attributes should be a plain object, null or omitted.'
);
}
/**
* Checks whether the given value is a serialized edge.
*
* @param {mixed} value - Target value.
* @return {string|null}
*/
function validateSerializedEdge(value) {
if (!isPlainObject(value))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid serialized edge. A serialized edge should be a plain object with at least a "source" & "target" property.'
);
if (!('source' in value))
throw new InvalidArgumentsGraphError(
'Graph.import: serialized edge is missing its source.'
);
if (!('target' in value))
throw new InvalidArgumentsGraphError(
'Graph.import: serialized edge is missing its target.'
);
if (
'attributes' in value &&
(!isPlainObject(value.attributes) || value.attributes === null)
)
throw new InvalidArgumentsGraphError(
'Graph.import: invalid attributes. Attributes should be a plain object, null or omitted.'
);
if ('undirected' in value && typeof value.undirected !== 'boolean')
throw new InvalidArgumentsGraphError(
'Graph.import: invalid undirectedness information. Undirected should be boolean or omitted.'
);
}
/* eslint no-nested-ternary: 0 */
/**
* Constants.
*/
const INSTANCE_ID = incrementalIdStartingFromRandomByte();
/**
* Enums.
*/
const TYPES = new Set(['directed', 'undirected', 'mixed']);
const EMITTER_PROPS = new Set([
'domain',
'_events',
'_eventsCount',
'_maxListeners'
]);
const EDGE_ADD_METHODS = [
{
name: verb => `${verb}Edge`,
generateKey: true
},
{
name: verb => `${verb}DirectedEdge`,
generateKey: true,
type: 'directed'
},
{
name: verb => `${verb}UndirectedEdge`,
generateKey: true,
type: 'undirected'
},
{
name: verb => `${verb}EdgeWithKey`
},
{
name: verb => `${verb}DirectedEdgeWithKey`,
type: 'directed'
},
{
name: verb => `${verb}UndirectedEdgeWithKey`,
type: 'undirected'
}
];
/**
* Default options.
*/
const DEFAULTS = {
allowSelfLoops: true,
multi: false,
type: 'mixed'
};
/**
* Abstract functions used by the Graph class for various methods.
*/
/**
* Internal method used to add a node to the given graph
*
* @param {Graph} graph - Target graph.
* @param {any} node - The node's key.
* @param {object} [attributes] - Optional attributes.
* @return {NodeData} - Created node data.
*/
function addNode(graph, node, attributes) {
if (attributes && !isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.addNode: invalid attributes. Expecting an object but got "${attributes}"`
);
// String coercion
node = '' + node;
attributes = attributes || {};
if (graph._nodes.has(node))
throw new UsageGraphError(
`Graph.addNode: the "${node}" node already exist in the graph.`
);
const data = new graph.NodeDataClass(node, attributes);
// Adding the node to internal register
graph._nodes.set(node, data);
// Emitting
graph.emit('nodeAdded', {
key: node,
attributes
});
return data;
}
/**
* Same as the above but without sanity checks because we call this in contexts
* where necessary checks were already done.
*/
function unsafeAddNode(graph, node, attributes) {
const data = new graph.NodeDataClass(node, attributes);
graph._nodes.set(node, data);
graph.emit('nodeAdded', {
key: node,
attributes
});
return data;
}
/**
* Internal method used to add an arbitrary edge to the given graph.
*
* @param {Graph} graph - Target graph.
* @param {string} name - Name of the child method for errors.
* @param {boolean} mustGenerateKey - Should the graph generate an id?
* @param {boolean} undirected - Whether the edge is undirected.
* @param {any} edge - The edge's key.
* @param {any} source - The source node.
* @param {any} target - The target node.
* @param {object} [attributes] - Optional attributes.
* @return {any} - The edge.
*
* @throws {Error} - Will throw if the graph is of the wrong type.
* @throws {Error} - Will throw if the given attributes are not an object.
* @throws {Error} - Will throw if source or target doesn't exist.
* @throws {Error} - Will throw if the edge already exist.
*/
function addEdge(
graph,
name,
mustGenerateKey,
undirected,
edge,
source,
target,
attributes
) {
// Checking validity of operation
if (!undirected && graph.type === 'undirected')
throw new UsageGraphError(
`Graph.${name}: you cannot add a directed edge to an undirected graph. Use the #.addEdge or #.addUndirectedEdge instead.`
);
if (undirected && graph.type === 'directed')
throw new UsageGraphError(
`Graph.${name}: you cannot add an undirected edge to a directed graph. Use the #.addEdge or #.addDirectedEdge instead.`
);
if (attributes && !isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${name}: invalid attributes. Expecting an object but got "${attributes}"`
);
// Coercion of source & target:
source = '' + source;
target = '' + target;
attributes = attributes || {};
if (!graph.allowSelfLoops && source === target)
throw new UsageGraphError(
`Graph.${name}: source & target are the same ("${source}"), thus creating a loop explicitly forbidden by this graph 'allowSelfLoops' option set to false.`
);
const sourceData = graph._nodes.get(source),
targetData = graph._nodes.get(target);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.${name}: source node "${source}" not found.`
);
if (!targetData)
throw new NotFoundGraphError(
`Graph.${name}: target node "${target}" not found.`
);
// Must the graph generate an id for this edge?
const eventData = {
key: null,
undirected,
source,
target,
attributes
};
if (mustGenerateKey) {
// NOTE: in this case we can guarantee that the key does not already
// exist and is already correctly casted as a string
edge = graph._edgeKeyGenerator();
} else {
// Coercion of edge key
edge = '' + edge;
// Here, we have a key collision
if (graph._edges.has(edge))
throw new UsageGraphError(
`Graph.${name}: the "${edge}" edge already exists in the graph.`
);
}
// Here, we might have a source / target collision
if (
!graph.multi &&
(undirected
? typeof sourceData.undirected[target] !== 'undefined'
: typeof sourceData.out[target] !== 'undefined')
) {
throw new UsageGraphError(
`Graph.${name}: an edge linking "${source}" to "${target}" already exists. If you really want to add multiple edges linking those nodes, you should create a multi graph by using the 'multi' option.`
);
}
// Storing some data
const edgeData = new EdgeData(
undirected,
edge,
sourceData,
targetData,
attributes
);
// Adding the edge to the internal register
graph._edges.set(edge, edgeData);
// Incrementing node degree counters
const isSelfLoop = source === target;
if (undirected) {
sourceData.undirectedDegree++;
targetData.undirectedDegree++;
if (isSelfLoop) {
sourceData.undirectedLoops++;
graph._undirectedSelfLoopCount++;
}
} else {
sourceData.outDegree++;
targetData.inDegree++;
if (isSelfLoop) {
sourceData.directedLoops++;
graph._directedSelfLoopCount++;
}
}
// Updating relevant index
if (graph.multi) edgeData.attachMulti();
else edgeData.attach();
if (undirected) graph._undirectedSize++;
else graph._directedSize++;
// Emitting
eventData.key = edge;
graph.emit('edgeAdded', eventData);
return edge;
}
/**
* Internal method used to add an arbitrary edge to the given graph.
*
* @param {Graph} graph - Target graph.
* @param {string} name - Name of the child method for errors.
* @param {boolean} mustGenerateKey - Should the graph generate an id?
* @param {boolean} undirected - Whether the edge is undirected.
* @param {any} edge - The edge's key.
* @param {any} source - The source node.
* @param {any} target - The target node.
* @param {object} [attributes] - Optional attributes.
* @param {boolean} [asUpdater] - Are we updating or merging?
* @return {any} - The edge.
*
* @throws {Error} - Will throw if the graph is of the wrong type.
* @throws {Error} - Will throw if the given attributes are not an object.
* @throws {Error} - Will throw if source or target doesn't exist.
* @throws {Error} - Will throw if the edge already exist.
*/
function mergeEdge(
graph,
name,
mustGenerateKey,
undirected,
edge,
source,
target,
attributes,
asUpdater
) {
// Checking validity of operation
if (!undirected && graph.type === 'undirected')
throw new UsageGraphError(
`Graph.${name}: you cannot merge/update a directed edge to an undirected graph. Use the #.mergeEdge/#.updateEdge or #.addUndirectedEdge instead.`
);
if (undirected && graph.type === 'directed')
throw new UsageGraphError(
`Graph.${name}: you cannot merge/update an undirected edge to a directed graph. Use the #.mergeEdge/#.updateEdge or #.addDirectedEdge instead.`
);
if (attributes) {
if (asUpdater) {
if (typeof attributes !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.${name}: invalid updater function. Expecting a function but got "${attributes}"`
);
} else {
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.${name}: invalid attributes. Expecting an object but got "${attributes}"`
);
}
}
// Coercion of source & target:
source = '' + source;
target = '' + target;
let updater;
if (asUpdater) {
updater = attributes;
attributes = undefined;
}
if (!graph.allowSelfLoops && source === target)
throw new UsageGraphError(
`Graph.${name}: source & target are the same ("${source}"), thus creating a loop explicitly forbidden by this graph 'allowSelfLoops' option set to false.`
);
let sourceData = graph._nodes.get(source);
let targetData = graph._nodes.get(target);
let edgeData;
// Do we need to handle duplicate?
let alreadyExistingEdgeData;
if (!mustGenerateKey) {
edgeData = graph._edges.get(edge);
if (edgeData) {
// Here, we need to ensure, if the user gave a key, that source & target
// are consistent
if (edgeData.source.key !== source || edgeData.target.key !== target) {
// If source or target inconsistent
if (
!undirected ||
edgeData.source.key !== target ||
edgeData.target.key !== source
) {
// If directed, or source/target aren't flipped
throw new UsageGraphError(
`Graph.${name}: inconsistency detected when attempting to merge the "${edge}" edge with "${source}" source & "${target}" target vs. ("${edgeData.source.key}", "${edgeData.target.key}").`
);
}
}
alreadyExistingEdgeData = edgeData;
}
}
// Here, we might have a source / target collision
if (!alreadyExistingEdgeData && !graph.multi && sourceData) {
alreadyExistingEdgeData = undirected
? sourceData.undirected[target]
: sourceData.out[target];
}
// Handling duplicates
if (alreadyExistingEdgeData) {
const info = [alreadyExistingEdgeData.key, false, false, false];
// We can skip the attribute merging part if the user did not provide them
if (asUpdater ? !updater : !attributes) return info;
// Updating the attributes
if (asUpdater) {
const oldAttributes = alreadyExistingEdgeData.attributes;
alreadyExistingEdgeData.attributes = updater(oldAttributes);
graph.emit('edgeAttributesUpdated', {
type: 'replace',
key: alreadyExistingEdgeData.key,
attributes: alreadyExistingEdgeData.attributes
});
}
// Merging the attributes
else {
assign(alreadyExistingEdgeData.attributes, attributes);
graph.emit('edgeAttributesUpdated', {
type: 'merge',
key: alreadyExistingEdgeData.key,
attributes: alreadyExistingEdgeData.attributes,
data: attributes
});
}
return info;
}
attributes = attributes || {};
if (asUpdater && updater) attributes = updater(attributes);
// Must the graph generate an id for this edge?
const eventData = {
key: null,
undirected,
source,
target,
attributes
};
if (mustGenerateKey) {
// NOTE: in this case we can guarantee that the key does not already
// exist and is already correctly casted as a string
edge = graph._edgeKeyGenerator();
} else {
// Coercion of edge key
edge = '' + edge;
// Here, we have a key collision
if (graph._edges.has(edge))
throw new UsageGraphError(
`Graph.${name}: the "${edge}" edge already exists in the graph.`
);
}
let sourceWasAdded = false;
let targetWasAdded = false;
if (!sourceData) {
sourceData = unsafeAddNode(graph, source, {});
sourceWasAdded = true;
if (source === target) {
targetData = sourceData;
targetWasAdded = true;
}
}
if (!targetData) {
targetData = unsafeAddNode(graph, target, {});
targetWasAdded = true;
}
// Storing some data
edgeData = new EdgeData(undirected, edge, sourceData, targetData, attributes);
// Adding the edge to the internal register
graph._edges.set(edge, edgeData);
// Incrementing node degree counters
const isSelfLoop = source === target;
if (undirected) {
sourceData.undirectedDegree++;
targetData.undirectedDegree++;
if (isSelfLoop) {
sourceData.undirectedLoops++;
graph._undirectedSelfLoopCount++;
}
} else {
sourceData.outDegree++;
targetData.inDegree++;
if (isSelfLoop) {
sourceData.directedLoops++;
graph._directedSelfLoopCount++;
}
}
// Updating relevant index
if (graph.multi) edgeData.attachMulti();
else edgeData.attach();
if (undirected) graph._undirectedSize++;
else graph._directedSize++;
// Emitting
eventData.key = edge;
graph.emit('edgeAdded', eventData);
return [edge, true, sourceWasAdded, targetWasAdded];
}
/**
* Internal method used to drop an edge.
*
* @param {Graph} graph - Target graph.
* @param {EdgeData} edgeData - Data of the edge to drop.
*/
function dropEdgeFromData(graph, edgeData) {
// Dropping the edge from the register
graph._edges.delete(edgeData.key);
// Updating related degrees
const {source: sourceData, target: targetData, attributes} = edgeData;
const undirected = edgeData.undirected;
const isSelfLoop = sourceData === targetData;
if (undirected) {
sourceData.undirectedDegree--;
targetData.undirectedDegree--;
if (isSelfLoop) {
sourceData.undirectedLoops--;
graph._undirectedSelfLoopCount--;
}
} else {
sourceData.outDegree--;
targetData.inDegree--;
if (isSelfLoop) {
sourceData.directedLoops--;
graph._directedSelfLoopCount--;
}
}
// Clearing index
if (graph.multi) edgeData.detachMulti();
else edgeData.detach();
if (undirected) graph._undirectedSize--;
else graph._directedSize--;
// Emitting
graph.emit('edgeDropped', {
key: edgeData.key,
attributes,
source: sourceData.key,
target: targetData.key,
undirected
});
}
/**
* Graph class
*
* @constructor
* @param {object} [options] - Options:
* @param {boolean} [allowSelfLoops] - Allow self loops?
* @param {string} [type] - Type of the graph.
* @param {boolean} [map] - Allow references as keys?
* @param {boolean} [multi] - Allow parallel edges?
*
* @throws {Error} - Will throw if the arguments are not valid.
*/
class Graph extends EventEmitter {
constructor(options) {
super();
//-- Solving options
options = assign({}, DEFAULTS, options);
// Enforcing options validity
if (typeof options.multi !== 'boolean')
throw new InvalidArgumentsGraphError(
`Graph.constructor: invalid 'multi' option. Expecting a boolean but got "${options.multi}".`
);
if (!TYPES.has(options.type))
throw new InvalidArgumentsGraphError(
`Graph.constructor: invalid 'type' option. Should be one of "mixed", "directed" or "undirected" but got "${options.type}".`
);
if (typeof options.allowSelfLoops !== 'boolean')
throw new InvalidArgumentsGraphError(
`Graph.constructor: invalid 'allowSelfLoops' option. Expecting a boolean but got "${options.allowSelfLoops}".`
);
//-- Private properties
// Utilities
const NodeDataClass =
options.type === 'mixed'
? MixedNodeData
: options.type === 'directed'
? DirectedNodeData
: UndirectedNodeData;
privateProperty(this, 'NodeDataClass', NodeDataClass);
// Internal edge key generator
// NOTE: this internal generator produce keys that are strings
// composed of a weird prefix, an incremental instance id starting from
// a random byte and finally an internal instance incremental id.
// All this to avoid intra-frame and cross-frame adversarial inputs
// that can force a single #.addEdge call to degenerate into a O(n)
// available key search loop.
// It also ensures that automatically generated edge keys are unlikely
// to produce collisions with arbitrary keys given by users.
const instancePrefix = 'geid_' + INSTANCE_ID() + '_';
let edgeId = 0;
const edgeKeyGenerator = () => {
let availableEdgeKey;
do {
availableEdgeKey = instancePrefix + edgeId++;
} while (this._edges.has(availableEdgeKey));
return availableEdgeKey;
};
// Indexes
privateProperty(this, '_attributes', {});
privateProperty(this, '_nodes', new Map());
privateProperty(this, '_edges', new Map());
privateProperty(this, '_directedSize', 0);
privateProperty(this, '_undirectedSize', 0);
privateProperty(this, '_directedSelfLoopCount', 0);
privateProperty(this, '_undirectedSelfLoopCount', 0);
privateProperty(this, '_edgeKeyGenerator', edgeKeyGenerator);
// Options
privateProperty(this, '_options', options);
// Emitter properties
EMITTER_PROPS.forEach(prop => privateProperty(this, prop, this[prop]));
//-- Properties readers
readOnlyProperty(this, 'order', () => this._nodes.size);
readOnlyProperty(this, 'size', () => this._edges.size);
readOnlyProperty(this, 'directedSize', () => this._directedSize);
readOnlyProperty(this, 'undirectedSize', () => this._undirectedSize);
readOnlyProperty(
this,
'selfLoopCount',
() => this._directedSelfLoopCount + this._undirectedSelfLoopCount
);
readOnlyProperty(
this,
'directedSelfLoopCount',
() => this._directedSelfLoopCount
);
readOnlyProperty(
this,
'undirectedSelfLoopCount',
() => this._undirectedSelfLoopCount
);
readOnlyProperty(this, 'multi', this._options.multi);
readOnlyProperty(this, 'type', this._options.type);
readOnlyProperty(this, 'allowSelfLoops', this._options.allowSelfLoops);
readOnlyProperty(this, 'implementation', () => 'graphology');
}
_resetInstanceCounters() {
this._directedSize = 0;
this._undirectedSize = 0;
this._directedSelfLoopCount = 0;
this._undirectedSelfLoopCount = 0;
}
/**---------------------------------------------------------------------------
* Read
**---------------------------------------------------------------------------
*/
/**
* Method returning whether the given node is found in the graph.
*
* @param {any} node - The node.
* @return {boolean}
*/
hasNode(node) {
return this._nodes.has('' + node);
}
/**
* Method returning whether the given directed edge is found in the graph.
*
* Arity 1:
* @param {any} edge - The edge's key.
*
* Arity 2:
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {boolean}
*
* @throws {Error} - Will throw if the arguments are invalid.
*/
hasDirectedEdge(source, target) {
// Early termination
if (this.type === 'undirected') return false;
if (arguments.length === 1) {
const edge = '' + source;
const edgeData = this._edges.get(edge);
return !!edgeData && !edgeData.undirected;
} else if (arguments.length === 2) {
source = '' + source;
target = '' + target;
// If the node source or the target is not in the graph we break
const nodeData = this._nodes.get(source);
if (!nodeData) return false;
// Is there a directed edge pointing toward target?
return nodeData.out.hasOwnProperty(target);
}
throw new InvalidArgumentsGraphError(
`Graph.hasDirectedEdge: invalid arity (${arguments.length}, instead of 1 or 2). You can either ask for an edge id or for the existence of an edge between a source & a target.`
);
}
/**
* Method returning whether the given undirected edge is found in the graph.
*
* Arity 1:
* @param {any} edge - The edge's key.
*
* Arity 2:
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {boolean}
*
* @throws {Error} - Will throw if the arguments are invalid.
*/
hasUndirectedEdge(source, target) {
// Early termination
if (this.type === 'directed') return false;
if (arguments.length === 1) {
const edge = '' + source;
const edgeData = this._edges.get(edge);
return !!edgeData && edgeData.undirected;
} else if (arguments.length === 2) {
source = '' + source;
target = '' + target;
// If the node source or the target is not in the graph we break
const nodeData = this._nodes.get(source);
if (!nodeData) return false;
// Is there a directed edge pointing toward target?
return nodeData.undirected.hasOwnProperty(target);
}
throw new InvalidArgumentsGraphError(
`Graph.hasDirectedEdge: invalid arity (${arguments.length}, instead of 1 or 2). You can either ask for an edge id or for the existence of an edge between a source & a target.`
);
}
/**
* Method returning whether the given edge is found in the graph.
*
* Arity 1:
* @param {any} edge - The edge's key.
*
* Arity 2:
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {boolean}
*
* @throws {Error} - Will throw if the arguments are invalid.
*/
hasEdge(source, target) {
if (arguments.length === 1) {
const edge = '' + source;
return this._edges.has(edge);
} else if (arguments.length === 2) {
source = '' + source;
target = '' + target;
// If the node source or the target is not in the graph we break
const nodeData = this._nodes.get(source);
if (!nodeData) return false;
// Is there a directed edge pointing toward target?
return (
(typeof nodeData.out !== 'undefined' &&
nodeData.out.hasOwnProperty(target)) ||
(typeof nodeData.undirected !== 'undefined' &&
nodeData.undirected.hasOwnProperty(target))
);
}
throw new InvalidArgumentsGraphError(
`Graph.hasEdge: invalid arity (${arguments.length}, instead of 1 or 2). You can either ask for an edge id or for the existence of an edge between a source & a target.`
);
}
/**
* Method returning the edge matching source & target in a directed fashion.
*
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {any|undefined}
*
* @throws {Error} - Will throw if the graph is multi.
* @throws {Error} - Will throw if source or target doesn't exist.
*/
directedEdge(source, target) {
if (this.type === 'undirected') return;
source = '' + source;
target = '' + target;
if (this.multi)
throw new UsageGraphError(
'Graph.directedEdge: this method is irrelevant with multigraphs since there might be multiple edges between source & target. See #.directedEdges instead.'
);
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.directedEdge: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.directedEdge: could not find the "${target}" target node in the graph.`
);
const edgeData = (sourceData.out && sourceData.out[target]) || undefined;
if (edgeData) return edgeData.key;
}
/**
* Method returning the edge matching source & target in a undirected fashion.
*
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {any|undefined}
*
* @throws {Error} - Will throw if the graph is multi.
* @throws {Error} - Will throw if source or target doesn't exist.
*/
undirectedEdge(source, target) {
if (this.type === 'directed') return;
source = '' + source;
target = '' + target;
if (this.multi)
throw new UsageGraphError(
'Graph.undirectedEdge: this method is irrelevant with multigraphs since there might be multiple edges between source & target. See #.undirectedEdges instead.'
);
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.undirectedEdge: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.undirectedEdge: could not find the "${target}" target node in the graph.`
);
const edgeData =
(sourceData.undirected && sourceData.undirected[target]) || undefined;
if (edgeData) return edgeData.key;
}
/**
* Method returning the edge matching source & target in a mixed fashion.
*
* @param {any} source - The edge's source.
* @param {any} target - The edge's target.
*
* @return {any|undefined}
*
* @throws {Error} - Will throw if the graph is multi.
* @throws {Error} - Will throw if source or target doesn't exist.
*/
edge(source, target) {
if (this.multi)
throw new UsageGraphError(
'Graph.edge: this method is irrelevant with multigraphs since there might be multiple edges between source & target. See #.edges instead.'
);
source = '' + source;
target = '' + target;
const sourceData = this._nodes.get(source);
if (!sourceData)
throw new NotFoundGraphError(
`Graph.edge: could not find the "${source}" source node in the graph.`
);
if (!this._nodes.has(target))
throw new NotFoundGraphError(
`Graph.edge: could not find the "${target}" target node in the graph.`
);
const edgeData =
(sourceData.out && sourceData.out[target]) ||
(sourceData.undirected && sourceData.undirected[target]) ||
undefined;
if (edgeData) return edgeData.key;
}
/**
* Method returning whether two nodes are directed neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areDirectedNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areDirectedNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return false;
return neighbor in nodeData.in || neighbor in nodeData.out;
}
/**
* Method returning whether two nodes are out neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areOutNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areOutNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return false;
return neighbor in nodeData.out;
}
/**
* Method returning whether two nodes are in neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areInNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areInNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return false;
return neighbor in nodeData.in;
}
/**
* Method returning whether two nodes are undirected neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areUndirectedNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areUndirectedNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type === 'directed') return false;
return neighbor in nodeData.undirected;
}
/**
* Method returning whether two nodes are neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type !== 'undirected') {
if (neighbor in nodeData.in || neighbor in nodeData.out) return true;
}
if (this.type !== 'directed') {
if (neighbor in nodeData.undirected) return true;
}
return false;
}
/**
* Method returning whether two nodes are inbound neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areInboundNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areInboundNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type !== 'undirected') {
if (neighbor in nodeData.in) return true;
}
if (this.type !== 'directed') {
if (neighbor in nodeData.undirected) return true;
}
return false;
}
/**
* Method returning whether two nodes are outbound neighbors.
*
* @param {any} node - The node's key.
* @param {any} neighbor - The neighbor's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
areOutboundNeighbors(node, neighbor) {
node = '' + node;
neighbor = '' + neighbor;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.areOutboundNeighbors: could not find the "${node}" node in the graph.`
);
if (this.type !== 'undirected') {
if (neighbor in nodeData.out) return true;
}
if (this.type !== 'directed') {
if (neighbor in nodeData.undirected) return true;
}
return false;
}
/**
* Method returning the given node's in degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
inDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.inDegree: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.inDegree;
}
/**
* Method returning the given node's out degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
outDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.outDegree: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.outDegree;
}
/**
* Method returning the given node's directed degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
directedDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.directedDegree: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.inDegree + nodeData.outDegree;
}
/**
* Method returning the given node's undirected degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
undirectedDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.undirectedDegree: could not find the "${node}" node in the graph.`
);
if (this.type === 'directed') return 0;
return nodeData.undirectedDegree;
}
/**
* Method returning the given node's inbound degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's inbound degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
inboundDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.inboundDegree: could not find the "${node}" node in the graph.`
);
let degree = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
}
if (this.type !== 'undirected') {
degree += nodeData.inDegree;
}
return degree;
}
/**
* Method returning the given node's outbound degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's outbound degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
outboundDegree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.outboundDegree: could not find the "${node}" node in the graph.`
);
let degree = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
}
if (this.type !== 'undirected') {
degree += nodeData.outDegree;
}
return degree;
}
/**
* Method returning the given node's directed degree.
*
* @param {any} node - The node's key.
* @return {number} - The node's degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
degree(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.degree: could not find the "${node}" node in the graph.`
);
let degree = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
}
if (this.type !== 'undirected') {
degree += nodeData.inDegree + nodeData.outDegree;
}
return degree;
}
/**
* Method returning the given node's in degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
inDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.inDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.inDegree - nodeData.directedLoops;
}
/**
* Method returning the given node's out degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
outDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.outDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.outDegree - nodeData.directedLoops;
}
/**
* Method returning the given node's directed degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
directedDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.directedDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
if (this.type === 'undirected') return 0;
return nodeData.inDegree + nodeData.outDegree - nodeData.directedLoops * 2;
}
/**
* Method returning the given node's undirected degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's in degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
undirectedDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.undirectedDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
if (this.type === 'directed') return 0;
return nodeData.undirectedDegree - nodeData.undirectedLoops * 2;
}
/**
* Method returning the given node's inbound degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's inbound degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
inboundDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.inboundDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
let degree = 0;
let loops = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
loops += nodeData.undirectedLoops * 2;
}
if (this.type !== 'undirected') {
degree += nodeData.inDegree;
loops += nodeData.directedLoops;
}
return degree - loops;
}
/**
* Method returning the given node's outbound degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's outbound degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
outboundDegreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.outboundDegreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
let degree = 0;
let loops = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
loops += nodeData.undirectedLoops * 2;
}
if (this.type !== 'undirected') {
degree += nodeData.outDegree;
loops += nodeData.directedLoops;
}
return degree - loops;
}
/**
* Method returning the given node's directed degree without considering self loops.
*
* @param {any} node - The node's key.
* @return {number} - The node's degree.
*
* @throws {Error} - Will throw if the node isn't in the graph.
*/
degreeWithoutSelfLoops(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.degreeWithoutSelfLoops: could not find the "${node}" node in the graph.`
);
let degree = 0;
let loops = 0;
if (this.type !== 'directed') {
degree += nodeData.undirectedDegree;
loops += nodeData.undirectedLoops * 2;
}
if (this.type !== 'undirected') {
degree += nodeData.inDegree + nodeData.outDegree;
loops += nodeData.directedLoops * 2;
}
return degree - loops;
}
/**
* Method returning the given edge's source.
*
* @param {any} edge - The edge's key.
* @return {any} - The edge's source.
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
source(edge) {
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.source: could not find the "${edge}" edge in the graph.`
);
return data.source.key;
}
/**
* Method returning the given edge's target.
*
* @param {any} edge - The edge's key.
* @return {any} - The edge's target.
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
target(edge) {
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.target: could not find the "${edge}" edge in the graph.`
);
return data.target.key;
}
/**
* Method returning the given edge's extremities.
*
* @param {any} edge - The edge's key.
* @return {array} - The edge's extremities.
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
extremities(edge) {
edge = '' + edge;
const edgeData = this._edges.get(edge);
if (!edgeData)
throw new NotFoundGraphError(
`Graph.extremities: could not find the "${edge}" edge in the graph.`
);
return [edgeData.source.key, edgeData.target.key];
}
/**
* Given a node & an edge, returns the other extremity of the edge.
*
* @param {any} node - The node's key.
* @param {any} edge - The edge's key.
* @return {any} - The related node.
*
* @throws {Error} - Will throw if the edge isn't in the graph or if the
* edge & node are not related.
*/
opposite(node, edge) {
node = '' + node;
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.opposite: could not find the "${edge}" edge in the graph.`
);
const source = data.source.key;
const target = data.target.key;
if (node === source) return target;
if (node === target) return source;
throw new NotFoundGraphError(
`Graph.opposite: the "${node}" node is not attached to the "${edge}" edge (${source}, ${target}).`
);
}
/**
* Returns whether the given edge has the given node as extremity.
*
* @param {any} edge - The edge's key.
* @param {any} node - The node's key.
* @return {boolean} - The related node.
*
* @throws {Error} - Will throw if either the node or the edge isn't in the graph.
*/
hasExtremity(edge, node) {
edge = '' + edge;
node = '' + node;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.hasExtremity: could not find the "${edge}" edge in the graph.`
);
return data.source.key === node || data.target.key === node;
}
/**
* Method returning whether the given edge is undirected.
*
* @param {any} edge - The edge's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
isUndirected(edge) {
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.isUndirected: could not find the "${edge}" edge in the graph.`
);
return data.undirected;
}
/**
* Method returning whether the given edge is directed.
*
* @param {any} edge - The edge's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
isDirected(edge) {
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.isDirected: could not find the "${edge}" edge in the graph.`
);
return !data.undirected;
}
/**
* Method returning whether the given edge is a self loop.
*
* @param {any} edge - The edge's key.
* @return {boolean}
*
* @throws {Error} - Will throw if the edge isn't in the graph.
*/
isSelfLoop(edge) {
edge = '' + edge;
const data = this._edges.get(edge);
if (!data)
throw new NotFoundGraphError(
`Graph.isSelfLoop: could not find the "${edge}" edge in the graph.`
);
return data.source === data.target;
}
/**---------------------------------------------------------------------------
* Mutation
**---------------------------------------------------------------------------
*/
/**
* Method used to add a node to the graph.
*
* @param {any} node - The node.
* @param {object} [attributes] - Optional attributes.
* @return {any} - The node.
*
* @throws {Error} - Will throw if the given node already exist.
* @throws {Error} - Will throw if the given attributes are not an object.
*/
addNode(node, attributes) {
const nodeData = addNode(this, node, attributes);
return nodeData.key;
}
/**
* Method used to merge a node into the graph.
*
* @param {any} node - The node.
* @param {object} [attributes] - Optional attributes.
* @return {any} - The node.
*/
mergeNode(node, attributes) {
if (attributes && !isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
`Graph.mergeNode: invalid attributes. Expecting an object but got "${attributes}"`
);
// String coercion
node = '' + node;
attributes = attributes || {};
// If the node already exists, we merge the attributes
let data = this._nodes.get(node);
if (data) {
if (attributes) {
assign(data.attributes, attributes);
this.emit('nodeAttributesUpdated', {
type: 'merge',
key: node,
attributes: data.attributes,
data: attributes
});
}
return [node, false];
}
data = new this.NodeDataClass(node, attributes);
// Adding the node to internal register
this._nodes.set(node, data);
// Emitting
this.emit('nodeAdded', {
key: node,
attributes
});
return [node, true];
}
/**
* Method used to add a node if it does not exist in the graph or else to
* update its attributes using a function.
*
* @param {any} node - The node.
* @param {function} [updater] - Optional updater function.
* @return {any} - The node.
*/
updateNode(node, updater) {
if (updater && typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
`Graph.updateNode: invalid updater function. Expecting a function but got "${updater}"`
);
// String coercion
node = '' + node;
// If the node already exists, we update the attributes
let data = this._nodes.get(node);
if (data) {
if (updater) {
const oldAttributes = data.attributes;
data.attributes = updater(oldAttributes);
this.emit('nodeAttributesUpdated', {
type: 'replace',
key: node,
attributes: data.attributes
});
}
return [node, false];
}
const attributes = updater ? updater({}) : {};
data = new this.NodeDataClass(node, attributes);
// Adding the node to internal register
this._nodes.set(node, data);
// Emitting
this.emit('nodeAdded', {
key: node,
attributes
});
return [node, true];
}
/**
* Method used to drop a single node & all its attached edges from the graph.
*
* @param {any} node - The node.
* @return {Graph}
*
* @throws {Error} - Will throw if the node doesn't exist.
*/
dropNode(node) {
node = '' + node;
const nodeData = this._nodes.get(node);
if (!nodeData)
throw new NotFoundGraphError(
`Graph.dropNode: could not find the "${node}" node in the graph.`
);
let edgeData;
// Removing attached edges
// NOTE: we could be faster here, but this is such a pain to maintain
if (this.type !== 'undirected') {
for (const neighbor in nodeData.out) {
edgeData = nodeData.out[neighbor];
do {
dropEdgeFromData(this, edgeData);
edgeData = edgeData.next;
} while (edgeData);
}
for (const neighbor in nodeData.in) {
edgeData = nodeData.in[neighbor];
do {
dropEdgeFromData(this, edgeData);
edgeData = edgeData.next;
} while (edgeData);
}
}
if (this.type !== 'directed') {
for (const neighbor in nodeData.undirected) {
edgeData = nodeData.undirected[neighbor];
do {
dropEdgeFromData(this, edgeData);
edgeData = edgeData.next;
} while (edgeData);
}
}
// Dropping the node from the register
this._nodes.delete(node);
// Emitting
this.emit('nodeDropped', {
key: node,
attributes: nodeData.attributes
});
}
/**
* Method used to drop a single edge from the graph.
*
* Arity 1:
* @param {any} edge - The edge.
*
* Arity 2:
* @param {any} source - Source node.
* @param {any} target - Target node.
*
* @return {Graph}
*
* @throws {Error} - Will throw if the edge doesn't exist.
*/
dropEdge(edge) {
let edgeData;
if (arguments.length > 1) {
const source = '' + arguments[0];
const target = '' + arguments[1];
edgeData = getMatchingEdge(this, source, target, this.type);
if (!edgeData)
throw new NotFoundGraphError(
`Graph.dropEdge: could not find the "${source}" -> "${target}" edge in the graph.`
);
} else {
edge = '' + edge;
edgeData = this._edges.get(edge);
if (!edgeData)
throw new NotFoundGraphError(
`Graph.dropEdge: could not find the "${edge}" edge in the graph.`
);
}
dropEdgeFromData(this, edgeData);
return this;
}
/**
* Method used to drop a single directed edge from the graph.
*
* @param {any} source - Source node.
* @param {any} target - Target node.
*
* @return {Graph}
*
* @throws {Error} - Will throw if the edge doesn't exist.
*/
dropDirectedEdge(source, target) {
if (arguments.length < 2)
throw new UsageGraphError(
'Graph.dropDirectedEdge: it does not make sense to try and drop a directed edge by key. What if the edge with this key is undirected? Use #.dropEdge for this purpose instead.'
);
if (this.multi)
throw new UsageGraphError(
'Graph.dropDirectedEdge: cannot use a {source,target} combo when dropping an edge in a MultiGraph since we cannot infer the one you want to delete as there could be multiple ones.'
);
source = '' + source;
target = '' + target;
const edgeData = getMatchingEdge(this, source, target, 'directed');
if (!edgeData)
throw new NotFoundGraphError(
`Graph.dropDirectedEdge: could not find a "${source}" -> "${target}" edge in the graph.`
);
dropEdgeFromData(this, edgeData);
return this;
}
/**
* Method used to drop a single undirected edge from the graph.
*
* @param {any} source - Source node.
* @param {any} target - Target node.
*
* @return {Graph}
*
* @throws {Error} - Will throw if the edge doesn't exist.
*/
dropUndirectedEdge(source, target) {
if (arguments.length < 2)
throw new UsageGraphError(
'Graph.dropUndirectedEdge: it does not make sense to drop a directed edge by key. What if the edge with this key is undirected? Use #.dropEdge for this purpose instead.'
);
if (this.multi)
throw new UsageGraphError(
'Graph.dropUndirectedEdge: cannot use a {source,target} combo when dropping an edge in a MultiGraph since we cannot infer the one you want to delete as there could be multiple ones.'
);
const edgeData = getMatchingEdge(this, source, target, 'undirected');
if (!edgeData)
throw new NotFoundGraphError(
`Graph.dropUndirectedEdge: could not find a "${source}" -> "${target}" edge in the graph.`
);
dropEdgeFromData(this, edgeData);
return this;
}
/**
* Method used to remove every edge & every node from the graph.
*
* @return {Graph}
*/
clear() {
// Clearing edges
this._edges.clear();
// Clearing nodes
this._nodes.clear();
// Reset counters
this._resetInstanceCounters();
// Emitting
this.emit('cleared');
}
/**
* Method used to remove every edge from the graph.
*
* @return {Graph}
*/
clearEdges() {
// Clearing structure index
const iterator = this._nodes.values();
let step;
while (((step = iterator.next()), step.done !== true)) {
step.value.clear();
}
// Clearing edges
this._edges.clear();
// Reset counters
this._resetInstanceCounters();
// Emitting
this.emit('edgesCleared');
}
/**---------------------------------------------------------------------------
* Attributes-related methods
**---------------------------------------------------------------------------
*/
/**
* Method returning the desired graph's attribute.
*
* @param {string} name - Name of the attribute.
* @return {any}
*/
getAttribute(name) {
return this._attributes[name];
}
/**
* Method returning the graph's attributes.
*
* @return {object}
*/
getAttributes() {
return this._attributes;
}
/**
* Method returning whether the graph has the desired attribute.
*
* @param {string} name - Name of the attribute.
* @return {boolean}
*/
hasAttribute(name) {
return this._attributes.hasOwnProperty(name);
}
/**
* Method setting a value for the desired graph's attribute.
*
* @param {string} name - Name of the attribute.
* @param {any} value - Value for the attribute.
* @return {Graph}
*/
setAttribute(name, value) {
this._attributes[name] = value;
// Emitting
this.emit('attributesUpdated', {
type: 'set',
attributes: this._attributes,
name
});
return this;
}
/**
* Method using a function to update the desired graph's attribute's value.
*
* @param {string} name - Name of the attribute.
* @param {function} updater - Function use to update the attribute's value.
* @return {Graph}
*/
updateAttribute(name, updater) {
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.updateAttribute: updater should be a function.'
);
const value = this._attributes[name];
this._attributes[name] = updater(value);
// Emitting
this.emit('attributesUpdated', {
type: 'set',
attributes: this._attributes,
name
});
return this;
}
/**
* Method removing the desired graph's attribute.
*
* @param {string} name - Name of the attribute.
* @return {Graph}
*/
removeAttribute(name) {
delete this._attributes[name];
// Emitting
this.emit('attributesUpdated', {
type: 'remove',
attributes: this._attributes,
name
});
return this;
}
/**
* Method replacing the graph's attributes.
*
* @param {object} attributes - New attributes.
* @return {Graph}
*
* @throws {Error} - Will throw if given attributes are not a plain object.
*/
replaceAttributes(attributes) {
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
'Graph.replaceAttributes: provided attributes are not a plain object.'
);
this._attributes = attributes;
// Emitting
this.emit('attributesUpdated', {
type: 'replace',
attributes: this._attributes
});
return this;
}
/**
* Method merging the graph's attributes.
*
* @param {object} attributes - Attributes to merge.
* @return {Graph}
*
* @throws {Error} - Will throw if given attributes are not a plain object.
*/
mergeAttributes(attributes) {
if (!isPlainObject(attributes))
throw new InvalidArgumentsGraphError(
'Graph.mergeAttributes: provided attributes are not a plain object.'
);
assign(this._attributes, attributes);
// Emitting
this.emit('attributesUpdated', {
type: 'merge',
attributes: this._attributes,
data: attributes
});
return this;
}
/**
* Method updating the graph's attributes.
*
* @param {function} updater - Function used to update the attributes.
* @return {Graph}
*
* @throws {Error} - Will throw if given updater is not a function.
*/
updateAttributes(updater) {
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.updateAttributes: provided updater is not a function.'
);
this._attributes = updater(this._attributes);
// Emitting
this.emit('attributesUpdated', {
type: 'update',
attributes: this._attributes
});
return this;
}
/**
* Method used to update each node's attributes using the given function.
*
* @param {function} updater - Updater function to use.
* @param {object} [hints] - Optional hints.
*/
updateEachNodeAttributes(updater, hints) {
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.updateEachNodeAttributes: expecting an updater function.'
);
if (hints && !validateHints(hints))
throw new InvalidArgumentsGraphError(
'Graph.updateEachNodeAttributes: invalid hints. Expecting an object having the following shape: {attributes?: [string]}'
);
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
nodeData.attributes = updater(nodeData.key, nodeData.attributes);
}
this.emit('eachNodeAttributesUpdated', {
hints: hints ? hints : null
});
}
/**
* Method used to update each edge's attributes using the given function.
*
* @param {function} updater - Updater function to use.
* @param {object} [hints] - Optional hints.
*/
updateEachEdgeAttributes(updater, hints) {
if (typeof updater !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.updateEachEdgeAttributes: expecting an updater function.'
);
if (hints && !validateHints(hints))
throw new InvalidArgumentsGraphError(
'Graph.updateEachEdgeAttributes: invalid hints. Expecting an object having the following shape: {attributes?: [string]}'
);
const iterator = this._edges.values();
let step, edgeData, sourceData, targetData;
while (((step = iterator.next()), step.done !== true)) {
edgeData = step.value;
sourceData = edgeData.source;
targetData = edgeData.target;
edgeData.attributes = updater(
edgeData.key,
edgeData.attributes,
sourceData.key,
targetData.key,
sourceData.attributes,
targetData.attributes,
edgeData.undirected
);
}
this.emit('eachEdgeAttributesUpdated', {
hints: hints ? hints : null
});
}
/**---------------------------------------------------------------------------
* Iteration-related methods
**---------------------------------------------------------------------------
*/
/**
* Method iterating over the graph's adjacency using the given callback.
*
* @param {function} callback - Callback to use.
*/
forEachAdjacencyEntry(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.forEachAdjacencyEntry: expecting a callback.'
);
forEachAdjacency(false, false, false, this, callback);
}
forEachAdjacencyEntryWithOrphans(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.forEachAdjacencyEntryWithOrphans: expecting a callback.'
);
forEachAdjacency(false, false, true, this, callback);
}
/**
* Method iterating over the graph's assymetric adjacency using the given callback.
*
* @param {function} callback - Callback to use.
*/
forEachAssymetricAdjacencyEntry(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.forEachAssymetricAdjacencyEntry: expecting a callback.'
);
forEachAdjacency(false, true, false, this, callback);
}
forEachAssymetricAdjacencyEntryWithOrphans(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.forEachAssymetricAdjacencyEntryWithOrphans: expecting a callback.'
);
forEachAdjacency(false, true, true, this, callback);
}
/**
* Method returning the list of the graph's nodes.
*
* @return {array} - The nodes.
*/
nodes() {
if (typeof Array.from === 'function') return Array.from(this._nodes.keys());
return take(this._nodes.keys(), this._nodes.size);
}
/**
* Method iterating over the graph's nodes using the given callback.
*
* @param {function} callback - Callback (key, attributes, index).
*/
forEachNode(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.forEachNode: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
callback(nodeData.key, nodeData.attributes);
}
}
/**
* Method iterating attempting to find a node matching the given predicate
* function.
*
* @param {function} callback - Callback (key, attributes).
*/
findNode(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.findNode: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
if (callback(nodeData.key, nodeData.attributes)) return nodeData.key;
}
return;
}
/**
* Method mapping nodes.
*
* @param {function} callback - Callback (key, attributes).
*/
mapNodes(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.mapNode: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
const result = new Array(this.order);
let i = 0;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
result[i++] = callback(nodeData.key, nodeData.attributes);
}
return result;
}
/**
* Method returning whether some node verify the given predicate.
*
* @param {function} callback - Callback (key, attributes).
*/
someNode(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.someNode: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
if (callback(nodeData.key, nodeData.attributes)) return true;
}
return false;
}
/**
* Method returning whether all node verify the given predicate.
*
* @param {function} callback - Callback (key, attributes).
*/
everyNode(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.everyNode: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
if (!callback(nodeData.key, nodeData.attributes)) return false;
}
return true;
}
/**
* Method filtering nodes.
*
* @param {function} callback - Callback (key, attributes).
*/
filterNodes(callback) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.filterNodes: expecting a callback.'
);
const iterator = this._nodes.values();
let step, nodeData;
const result = [];
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
if (callback(nodeData.key, nodeData.attributes))
result.push(nodeData.key);
}
return result;
}
/**
* Method reducing nodes.
*
* @param {function} callback - Callback (accumulator, key, attributes).
*/
reduceNodes(callback, initialValue) {
if (typeof callback !== 'function')
throw new InvalidArgumentsGraphError(
'Graph.reduceNodes: expecting a callback.'
);
if (arguments.length < 2)
throw new InvalidArgumentsGraphError(
'Graph.reduceNodes: missing initial value. You must provide it because the callback takes more than one argument and we cannot infer the initial value from the first iteration, as you could with a simple array.'
);
let accumulator = initialValue;
const iterator = this._nodes.values();
let step, nodeData;
while (((step = iterator.next()), step.done !== true)) {
nodeData = step.value;
accumulator = callback(accumulator, nodeData.key, nodeData.attributes);
}
return accumulator;
}
/**
* Method returning an iterator over the graph's node entries.
*
* @return {Iterator}
*/
nodeEntries() {
const iterator = this._nodes.values();
return new Iterator(() => {
const step = iterator.next();
if (step.done) return step;
const data = step.value;
return {
value: {node: data.key, attributes: data.attributes},
done: false
};
});
}
/**---------------------------------------------------------------------------
* Serialization
**---------------------------------------------------------------------------
*/
/**
* Method used to export the whole graph.
*
* @return {object} - The serialized graph.
*/
export() {
const nodes = new Array(this._nodes.size);
let i = 0;
this._nodes.forEach((data, key) => {
nodes[i++] = serializeNode(key, data);
});
const edges = new Array(this._edges.size);
i = 0;
this._edges.forEach((data, key) => {
edges[i++] = serializeEdge(this.type, key, data);
});
return {
options: {
type: this.type,
multi: this.multi,
allowSelfLoops: this.allowSelfLoops
},
attributes: this.getAttributes(),
nodes,
edges
};
}
/**
* Method used to import a serialized graph.
*
* @param {object|Graph} data - The serialized graph.
* @param {boolean} merge - Whether to merge data.
* @return {Graph} - Returns itself for chaining.
*/
import(data, merge = false) {
// Importing a Graph instance directly
if (data instanceof Graph) {
// Nodes
data.forEachNode((n, a) => {
if (merge) this.mergeNode(n, a);
else this.addNode(n, a);
});
// Edges
data.forEachEdge((e, a, s, t, _sa, _ta, u) => {
if (merge) {
if (u) this.mergeUndirectedEdgeWithKey(e, s, t, a);
else this.mergeDirectedEdgeWithKey(e, s, t, a);
} else {
if (u) this.addUndirectedEdgeWithKey(e, s, t, a);
else this.addDirectedEdgeWithKey(e, s, t, a);
}
});
return this;
}
// Importing a serialized graph
if (!isPlainObject(data))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid argument. Expecting a serialized graph or, alternatively, a Graph instance.'
);
if (data.attributes) {
if (!isPlainObject(data.attributes))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid attributes. Expecting a plain object.'
);
if (merge) this.mergeAttributes(data.attributes);
else this.replaceAttributes(data.attributes);
}
let i, l, list, node, edge;
if (data.nodes) {
list = data.nodes;
if (!Array.isArray(list))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid nodes. Expecting an array.'
);
for (i = 0, l = list.length; i < l; i++) {
node = list[i];
// Validating
validateSerializedNode(node);
// Adding the node
const {key, attributes} = node;
if (merge) this.mergeNode(key, attributes);
else this.addNode(key, attributes);
}
}
if (data.edges) {
let undirectedByDefault = false;
if (this.type === 'undirected') {
undirectedByDefault = true;
}
list = data.edges;
if (!Array.isArray(list))
throw new InvalidArgumentsGraphError(
'Graph.import: invalid edges. Expecting an array.'
);
for (i = 0, l = list.length; i < l; i++) {
edge = list[i];
// Validating
validateSerializedEdge(edge);
// Adding the edge
const {
source,
target,
attributes,
undirected = undirectedByDefault
} = edge;
let method;
if ('key' in edge) {
method = merge
? undirected
? this.mergeUndirectedEdgeWithKey
: this.mergeDirectedEdgeWithKey
: undirected
? this.addUndirectedEdgeWithKey
: this.addDirectedEdgeWithKey;
method.call(this, edge.key, source, target, attributes);
} else {
method = merge
? undirected
? this.mergeUndirectedEdge
: this.mergeDirectedEdge
: undirected
? this.addUndirectedEdge
: this.addDirectedEdge;
method.call(this, source, target, attributes);
}
}
}
return this;
}
/**---------------------------------------------------------------------------
* Utils
**---------------------------------------------------------------------------
*/
/**
* Method returning a null copy of the graph, i.e. a graph without nodes
* & edges but with the exact same options.
*
* @param {object} options - Options to merge with the current ones.
* @return {Graph} - The null copy.
*/
nullCopy(options) {
const graph = new Graph(assign({}, this._options, options));
graph.replaceAttributes(assign({}, this.getAttributes()));
return graph;
}
/**
* Method returning an empty copy of the graph, i.e. a graph without edges but
* with the exact same options.
*
* @param {object} options - Options to merge with the current ones.
* @return {Graph} - The empty copy.
*/
emptyCopy(options) {
const graph = this.nullCopy(options);
this._nodes.forEach((nodeData, key) => {
const attributes = assign({}, nodeData.attributes);
// NOTE: no need to emit events since user cannot access the instance yet
nodeData = new graph.NodeDataClass(key, attributes);
graph._nodes.set(key, nodeData);
});
return graph;
}
/**
* Method returning an exact copy of the graph.
*
* @param {object} options - Upgrade options.
* @return {Graph} - The copy.
*/
copy(options) {
options = options || {};
if (
typeof options.type === 'string' &&
options.type !== this.type &&
options.type !== 'mixed'
)
throw new UsageGraphError(
`Graph.copy: cannot create an incompatible copy from "${this.type}" type to "${options.type}" because this would mean losing information about the current graph.`
);
if (
typeof options.multi === 'boolean' &&
options.multi !== this.multi &&
options.multi !== true
)
throw new UsageGraphError(
'Graph.copy: cannot create an incompatible copy by downgrading a multi graph to a simple one because this would mean losing information about the current graph.'
);
if (
typeof options.allowSelfLoops === 'boolean' &&
options.allowSelfLoops !== this.allowSelfLoops &&
options.allowSelfLoops !== true
)
throw new UsageGraphError(
'Graph.copy: cannot create an incompatible copy from a graph allowing self loops to one that does not because this would mean losing information about the current graph.'
);
const graph = this.emptyCopy(options);
const iterator = this._edges.values();
let step, edgeData;
while (((step = iterator.next()), step.done !== true)) {
edgeData = step.value;
// NOTE: no need to emit events since user cannot access the instance yet
addEdge(
graph,
'copy',
false,
edgeData.undirected,
edgeData.key,
edgeData.source.key,
edgeData.target.key,
assign({}, edgeData.attributes)
);
}
return graph;
}
/**---------------------------------------------------------------------------
* Known methods
**---------------------------------------------------------------------------
*/
/**
* Method used by JavaScript to perform JSON serialization.
*
* @return {object} - The serialized graph.
*/
toJSON() {
return this.export();
}
/**
* Method returning [object Graph].
*/
toString() {
return '[object Graph]';
}
/**
* Method used internally by node's console to display a custom object.
*
* @return {object} - Formatted object representation of the graph.
*/
inspect() {
const nodes = {};
this._nodes.forEach((data, key) => {
nodes[key] = data.attributes;
});
const edges = {},
multiIndex = {};
this._edges.forEach((data, key) => {
const direction = data.undirected ? '--' : '->';
let label = '';
let source = data.source.key;
let target = data.target.key;
let tmp;
if (data.undirected && source > target) {
tmp = source;
source = target;
target = tmp;
}
const desc = `(${source})${direction}(${target})`;
if (!key.startsWith('geid_')) {
label += `[${key}]: `;
} else if (this.multi) {
if (typeof multiIndex[desc] === 'undefined') {
multiIndex[desc] = 0;
} else {
multiIndex[desc]++;
}
label += `${multiIndex[desc]}. `;
}
label += desc;
edges[label] = data.attributes;
});
const dummy = {};
for (const k in this) {
if (
this.hasOwnProperty(k) &&
!EMITTER_PROPS.has(k) &&
typeof this[k] !== 'function' &&
typeof k !== 'symbol'
)
dummy[k] = this[k];
}
dummy.attributes = this._attributes;
dummy.nodes = nodes;
dummy.edges = edges;
privateProperty(dummy, 'constructor', this.constructor);
return dummy;
}
}
/**
* Attaching methods to the prototype.
*
* Here, we are attaching a wide variety of methods to the Graph class'
* prototype when those are very numerous and when their creation is
* abstracted.
*/
/**
* Attaching custom inspect method for node >= 10.
*/
if (typeof Symbol !== 'undefined')
Graph.prototype[Symbol.for('nodejs.util.inspect.custom')] =
Graph.prototype.inspect;
/**
* Related to edge addition.
*/
EDGE_ADD_METHODS.forEach(method => {
['add', 'merge', 'update'].forEach(verb => {
const name = method.name(verb);
const fn = verb === 'add' ? addEdge : mergeEdge;
if (method.generateKey) {
Graph.prototype[name] = function (source, target, attributes) {
return fn(
this,
name,
true,
(method.type || this.type) === 'undirected',
null,
source,
target,
attributes,
verb === 'update'
);
};
} else {
Graph.prototype[name] = function (edge, source, target, attributes) {
return fn(
this,
name,
false,
(method.type || this.type) === 'undirected',
edge,
source,
target,
attributes,
verb === 'update'
);
};
}
});
});
/**
* Attributes-related.
*/
attachNodeAttributesMethods(Graph);
attachEdgeAttributesMethods(Graph);
/**
* Edge iteration-related.
*/
attachEdgeIterationMethods(Graph);
/**
* Neighbor iteration-related.
*/
attachNeighborIterationMethods(Graph);
/**
* Graphology Helper Classes
* ==========================
*
* Building some higher-order classes instantiating the graph with
* predefinite options.
*/
/**
* Alternative constructors.
*/
class DirectedGraph extends Graph {
constructor(options) {
const finalOptions = assign({type: 'directed'}, options);
if ('multi' in finalOptions && finalOptions.multi !== false)
throw new InvalidArgumentsGraphError(
'DirectedGraph.from: inconsistent indication that the graph should be multi in given options!'
);
if (finalOptions.type !== 'directed')
throw new InvalidArgumentsGraphError(
'DirectedGraph.from: inconsistent "' +
finalOptions.type +
'" type in given options!'
);
super(finalOptions);
}
}
class UndirectedGraph extends Graph {
constructor(options) {
const finalOptions = assign({type: 'undirected'}, options);
if ('multi' in finalOptions && finalOptions.multi !== false)
throw new InvalidArgumentsGraphError(
'UndirectedGraph.from: inconsistent indication that the graph should be multi in given options!'
);
if (finalOptions.type !== 'undirected')
throw new InvalidArgumentsGraphError(
'UndirectedGraph.from: inconsistent "' +
finalOptions.type +
'" type in given options!'
);
super(finalOptions);
}
}
class MultiGraph extends Graph {
constructor(options) {
const finalOptions = assign({multi: true}, options);
if ('multi' in finalOptions && finalOptions.multi !== true)
throw new InvalidArgumentsGraphError(
'MultiGraph.from: inconsistent indication that the graph should be simple in given options!'
);
super(finalOptions);
}
}
class MultiDirectedGraph extends Graph {
constructor(options) {
const finalOptions = assign({type: 'directed', multi: true}, options);
if ('multi' in finalOptions && finalOptions.multi !== true)
throw new InvalidArgumentsGraphError(
'MultiDirectedGraph.from: inconsistent indication that the graph should be simple in given options!'
);
if (finalOptions.type !== 'directed')
throw new InvalidArgumentsGraphError(
'MultiDirectedGraph.from: inconsistent "' +
finalOptions.type +
'" type in given options!'
);
super(finalOptions);
}
}
class MultiUndirectedGraph extends Graph {
constructor(options) {
const finalOptions = assign({type: 'undirected', multi: true}, options);
if ('multi' in finalOptions && finalOptions.multi !== true)
throw new InvalidArgumentsGraphError(
'MultiUndirectedGraph.from: inconsistent indication that the graph should be simple in given options!'
);
if (finalOptions.type !== 'undirected')
throw new InvalidArgumentsGraphError(
'MultiUndirectedGraph.from: inconsistent "' +
finalOptions.type +
'" type in given options!'
);
super(finalOptions);
}
}
/**
* Attaching static #.from method to each of the constructors.
*/
function attachStaticFromMethod(Class) {
/**
* Builds a graph from serialized data or another graph's data.
*
* @param {Graph|SerializedGraph} data - Hydratation data.
* @param {object} [options] - Options.
* @return {Class}
*/
Class.from = function (data, options) {
// Merging given options with serialized ones
const finalOptions = assign({}, data.options, options);
const instance = new Class(finalOptions);
instance.import(data);
return instance;
};
}
attachStaticFromMethod(Graph);
attachStaticFromMethod(DirectedGraph);
attachStaticFromMethod(UndirectedGraph);
attachStaticFromMethod(MultiGraph);
attachStaticFromMethod(MultiDirectedGraph);
attachStaticFromMethod(MultiUndirectedGraph);
Graph.Graph = Graph;
Graph.DirectedGraph = DirectedGraph;
Graph.UndirectedGraph = UndirectedGraph;
Graph.MultiGraph = MultiGraph;
Graph.MultiDirectedGraph = MultiDirectedGraph;
Graph.MultiUndirectedGraph = MultiUndirectedGraph;
Graph.InvalidArgumentsGraphError = InvalidArgumentsGraphError;
Graph.NotFoundGraphError = NotFoundGraphError;
Graph.UsageGraphError = UsageGraphError;
/**
* Graphology ESM Endoint
* =======================
*
* Endpoint for ESM modules consumers.
*/
export { DirectedGraph, Graph, InvalidArgumentsGraphError, MultiDirectedGraph, MultiGraph, MultiUndirectedGraph, NotFoundGraphError, UndirectedGraph, UsageGraphError, Graph as default };
//# sourceMappingURL=graphology.mjs.map