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/*
* Copyright 2016 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.javascript.jscomp.PolymerPassErrors.POLYMER_MISPLACED_PROPERTY_JSDOC;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Ascii;
import com.google.common.base.CaseFormat;
import com.google.common.collect.ImmutableList;
import com.google.javascript.jscomp.PolymerPass.MemberDefinition;
import com.google.javascript.jscomp.parsing.parser.util.format.SimpleFormat;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Simple static utility functions shared between the {@link PolymerPass} and its helper classes.
*/
final class PolymerPassStaticUtils {
private static final String VIRTUAL_FILE = "";
/** @return Whether the call represents a call to the Polymer function. */
@VisibleForTesting
public static boolean isPolymerCall(Node call) {
if (call == null || !call.isCall()) {
return false;
}
Node name = call.getFirstChild();
// When imported from an ES module, the rewriting should set the original name.
// When imported from an goog module (TS), we'll have a GETPROP like
// `module$polymer$polymer_legacy.Polymer`.
return name.matchesName("Polymer")
|| "Polymer".equals(name.getOriginalQualifiedName())
|| (name.isGetProp() && Node.getGetpropString(name).equals("Polymer"));
}
/** @return Whether the class extends PolymerElement. */
@VisibleForTesting
public static boolean isPolymerClass(Node cls) {
if (cls == null || !cls.isClass()) {
return false;
}
// A class with the @polymer annotation is always considered a Polymer element.
JSDocInfo info = NodeUtil.getBestJSDocInfo(cls);
if (info != null && info.isPolymer()) {
return true;
}
Node heritage = cls.getSecondChild();
// In Polymer 3, the base class was renamed from `Polymer.Element` to `PolymerElement`. When
// imported from an ES module, the rewriting should set the original name to `PolymerElement`.
// When imported from an goog module (TS), we'll have a GETPROP like
// `module$polymer$polymer_element.PolymerElement`.
return !heritage.isEmpty()
&& (heritage.matchesQualifiedName("Polymer.Element")
|| heritage.matchesName("PolymerElement")
|| "PolymerElement".equals(heritage.getOriginalQualifiedName())
|| (heritage.isGetProp() && Node.getGetpropString(heritage).equals("PolymerElement")));
}
/**
* The "$" member in a Polymer element is a map of statically created nodes in its local DOM. This
* method is used to rewrite usage of this map from "this.$.foo" to "this.$['foo']" to avoid
* JSC_POSSIBLE_INEXISTENT_PROPERTY errors. Excludes function calls like "bar.$.foo()" since some
* libraries place methods under a "$" member.
*/
static void switchDollarSignPropsToBrackets(Node def, final AbstractCompiler compiler) {
checkState(def.isObjectLit() || def.isClassMembers());
for (Node keyNode = def.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) {
Node value = keyNode.getFirstChild();
if (value != null && value.isFunction()) {
NodeUtil.visitPostOrder(
value.getLastChild(),
new NodeUtil.Visitor() {
@Override
public void visit(Node n) {
if (!n.isGetProp()) {
return;
}
Node dollarSign = n.getFirstChild();
if (!dollarSign.isGetProp() || !Node.getGetpropString(dollarSign).equals("$")) {
return;
}
// Some libraries like Mojo JS Bindings and jQuery place methods in a "$" member
// e.g. "foo.$.closePipe()". Avoid converting to brackets for these cases.
if (n.getParent().isCall() && n.getParent().hasOneChild()) {
return;
}
Node key =
IR.string(Node.getGetpropString(n)).clonePropsFrom(n).useSourceInfoFrom(n);
Node getelem =
IR.getelem(dollarSign.detach(), key).clonePropsFrom(n).useSourceInfoFrom(n);
n.replaceWith(getelem);
compiler.reportChangeToEnclosingScope(getelem);
}
});
}
}
}
/**
* Makes sure that the keys for listeners and hostAttributes blocks are quoted to avoid renaming.
*/
static void quoteListenerAndHostAttributeKeys(Node objLit, AbstractCompiler compiler) {
checkState(objLit.isObjectLit());
for (Node keyNode = objLit.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) {
if (keyNode.isComputedProp()) {
continue;
}
if (!keyNode.getString().equals("listeners")
&& !keyNode.getString().equals("hostAttributes")) {
continue;
}
for (Node keyToQuote = keyNode.getFirstFirstChild();
keyToQuote != null;
keyToQuote = keyToQuote.getNext()) {
if (!keyToQuote.isQuotedString()) {
keyToQuote.setQuotedString();
compiler.reportChangeToEnclosingScope(keyToQuote);
}
}
}
}
/**
* Finds a list of {@link MemberDefinition}s for the {@code properties} block of the given
* descriptor Object literal.
*
* @param descriptor The Polymer properties configuration object literal node.
* @param constructor If we are finding the properties of an ES6 class, the constructor function
* node for that class, otherwise null. We'll prefer JSDoc from property initialization
* statements in this constructor over the JSDoc within the Polymer properties configuration
* object.
*/
static ImmutableList extractProperties(
Node descriptor,
PolymerClassDefinition.DefinitionType defType,
AbstractCompiler compiler,
@Nullable Node constructor) {
Node properties = descriptor;
if (defType == PolymerClassDefinition.DefinitionType.ObjectLiteral) {
properties = NodeUtil.getFirstPropMatchingKey(descriptor, "properties");
}
if (properties == null) {
return ImmutableList.of();
}
Map constructorPropertyJsDoc = new HashMap<>();
if (constructor != null) {
collectConstructorPropertyJsDoc(constructor, constructorPropertyJsDoc);
}
ImmutableList.Builder members = ImmutableList.builder();
for (Node keyNode = properties.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) {
// The JSDoc for a Polymer property in the constructor should win over the JSDoc in the
// Polymer properties configuration object.
JSDocInfo constructorJsDoc = constructorPropertyJsDoc.get(keyNode.getString());
JSDocInfo propertiesConfigJsDoc = NodeUtil.getBestJSDocInfo(keyNode);
JSDocInfo bestJsDoc;
if (constructorJsDoc != null) {
bestJsDoc = constructorJsDoc;
if (propertiesConfigJsDoc != null) {
// Warn if the user put JSDoc in both places.
compiler.report(JSError.make(keyNode, POLYMER_MISPLACED_PROPERTY_JSDOC));
}
} else {
bestJsDoc = propertiesConfigJsDoc;
}
members.add(new MemberDefinition(bestJsDoc, keyNode, keyNode.getFirstChild()));
}
return members.build();
}
/**
* Find the properties that are initialized in the given constructor, and return a map from each
* property name to its JSDoc.
*
* @param node The constructor function node to traverse.
* @param map The map from property name to JSDoc.
*/
private static void collectConstructorPropertyJsDoc(Node node, Map map) {
checkNotNull(node);
for (Node child = node.getFirstChild(); child != null; child = child.getNext()) {
if (child.isGetProp() && child.getFirstChild().isThis()) {
// We found a "this.foo" expression. Map "foo" to its JSDoc.
map.put(Node.getGetpropString(child), NodeUtil.getBestJSDocInfo(child));
} else {
// Recurse through every other kind of node, because properties are not necessarily declared
// at the top level of the constructor body; e.g. they could be declared as part of an
// assignment, or within an if statement. We're being overly loose here, e.g. we shouldn't
// traverse into a nested function where "this" doesn't refer to our prototype, but
// hopefully this is good enough for our purposes.
collectConstructorPropertyJsDoc(child, map);
}
}
}
/**
* Gets the JSTypeExpression for a given property using its "type" key.
* @see https://github.com/Polymer/polymer/blob/0.8-preview/PRIMER.md#configuring-properties
*/
static JSTypeExpression getTypeFromProperty(
MemberDefinition property, AbstractCompiler compiler) {
if (property.info != null && property.info.hasType()) {
return property.info.getType().copy();
}
Node typeValue;
if (property.value.isObjectLit()) {
typeValue = NodeUtil.getFirstPropMatchingKey(property.value, "type");
if (typeValue == null || !typeValue.isName()) {
compiler.report(JSError.make(property.name, PolymerPassErrors.POLYMER_INVALID_PROPERTY));
return null;
}
} else if (property.value.isName()) {
typeValue = property.value;
} else {
typeValue = null;
}
if (typeValue == null) {
compiler.report(JSError.make(property.value, PolymerPassErrors.POLYMER_INVALID_PROPERTY));
return null;
}
String typeString = typeValue.getString();
Node typeNode;
switch (typeString) {
case "Boolean":
case "String":
case "Number":
typeNode = IR.string(Ascii.toLowerCase(typeString));
break;
case "Array":
case "Function":
case "Object":
case "Date":
typeNode = new Node(Token.BANG, IR.string(typeString));
break;
default:
compiler.report(JSError.make(property.value, PolymerPassErrors.POLYMER_INVALID_PROPERTY));
typeNode = new Node(Token.QMARK);
}
typeNode.useSourceInfoFromForTree(typeValue);
return new JSTypeExpression(typeNode, VIRTUAL_FILE);
}
/**
* @return The PolymerElement type string for a class definition.
*/
public static String getPolymerElementType(final PolymerClassDefinition cls) {
String nativeElementName = cls.nativeBaseElement == null ? ""
: CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, cls.nativeBaseElement);
return SimpleFormat.format("Polymer%sElement", nativeElementName);
}
}
