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Liferay Frontend JS Minifier
/*
* 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.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.base.CaseFormat;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.javascript.jscomp.PolymerBehaviorExtractor.BehaviorDefinition;
import com.google.javascript.jscomp.PolymerPass.MemberDefinition;
import com.google.javascript.jscomp.modules.ModuleMetadataMap.ModuleMetadata;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
/**
* Parsed Polymer class (element) definition. Includes convenient fields for rewriting the class.
*/
final class PolymerClassDefinition {
static enum DefinitionType {
ObjectLiteral,
ES6Class
}
/** The declaration style used for the Polymer definition */
final DefinitionType defType;
/** The Polymer call or class node which defines the Element. */
final Node definition;
/** The target node (LHS) for the Polymer element definition. */
final Node target;
/** Whether the target of this element is a generated node */
final boolean hasGeneratedLhs;
/** The object literal passed to the call to the Polymer() function. */
final Node descriptor;
/** The constructor function for the element. */
final MemberDefinition constructor;
/** The name of the native HTML element which this element extends. */
@Nullable final String nativeBaseElement;
/** Properties declared in the Polymer "properties" block. */
final List props;
/** Properties declared in the Polymer behavior's "properties" block. */
final Map behaviorProps;
/** Methods on the element. */
@Nullable final List methods;
/** Flattened list of behavior definitions used by this element. */
@Nullable final ImmutableList behaviors;
/** Language features that should be carried over to the extraction destination. */
@Nullable final FeatureSet features;
private String interfaceName = null;
PolymerClassDefinition(
DefinitionType defType,
Node definition,
Node target,
boolean hasGeneratedLhs,
Node descriptor,
JSDocInfo classInfo,
MemberDefinition constructor,
String nativeBaseElement,
List props,
Map behaviorProps,
List methods,
ImmutableList behaviors,
FeatureSet features) {
this.defType = defType;
this.definition = definition;
this.target = target;
this.hasGeneratedLhs = hasGeneratedLhs;
checkState(descriptor == null || descriptor.isObjectLit());
this.descriptor = descriptor;
this.constructor = constructor;
this.nativeBaseElement = nativeBaseElement;
this.props = props;
this.behaviorProps = behaviorProps;
this.methods = methods;
this.behaviors = behaviors;
this.features = features;
}
/**
* Validates the class definition and if valid, destructively extracts the class definition from
* the AST.
*/
@Nullable
static PolymerClassDefinition extractFromCallNode(
Node callNode,
AbstractCompiler compiler,
ModuleMetadata moduleMetadata,
PolymerBehaviorExtractor behaviorExtractor) {
Node descriptor = NodeUtil.getArgumentForCallOrNew(callNode, 0);
if (descriptor == null || !descriptor.isObjectLit()) {
// report bad class definition
compiler.report(JSError.make(callNode, PolymerPassErrors.POLYMER_DESCRIPTOR_NOT_VALID));
return null;
}
int paramCount = callNode.getChildCount() - 1;
if (paramCount != 1) {
compiler.report(JSError.make(callNode, PolymerPassErrors.POLYMER_UNEXPECTED_PARAMS));
return null;
}
Node elName = NodeUtil.getFirstPropMatchingKey(descriptor, "is");
if (elName == null) {
compiler.report(JSError.make(callNode, PolymerPassErrors.POLYMER_MISSING_IS));
return null;
}
boolean hasGeneratedLhs = false;
Node target;
if (NodeUtil.isNameDeclaration(callNode.getGrandparent())) {
target = IR.name(callNode.getParent().getString());
} else if (callNode.getParent().isAssign()) {
if (isGoogModuleExports(callNode.getParent())) {
// `exports = Polymer({` in a goog.module requires special handling, as adding a
// duplicate assignment to exports just confuses the compiler. Create a dummy declaration
// var exportsForPolymer$jscomp0 = Polymer({ // ...
target = createDummyGoogModuleExportsTarget(compiler, callNode);
} else {
target = callNode.getParent().getFirstChild().cloneTree();
}
} else {
String elNameStringBase =
elName.isQualifiedName()
? elName.getQualifiedName().replace('.', '$')
: elName.getString();
String elNameString = CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, elNameStringBase);
elNameString += "Element";
target = IR.name(elNameString);
hasGeneratedLhs = true;
}
JSDocInfo classInfo = NodeUtil.getBestJSDocInfo(target);
JSDocInfo ctorInfo = null;
Node constructor = NodeUtil.getFirstPropMatchingKey(descriptor, "factoryImpl");
if (constructor == null) {
constructor = NodeUtil.emptyFunction();
compiler.reportChangeToChangeScope(constructor);
constructor.srcrefTree(callNode);
} else {
ctorInfo = NodeUtil.getBestJSDocInfo(constructor);
}
Node baseClass = NodeUtil.getFirstPropMatchingKey(descriptor, "extends");
String nativeBaseElement = baseClass == null ? null : baseClass.getString();
Node behaviorArray = NodeUtil.getFirstPropMatchingKey(descriptor, "behaviors");
ImmutableList behaviors =
behaviorExtractor.extractBehaviors(behaviorArray, moduleMetadata);
List properties = new ArrayList<>();
Map behaviorProps = new LinkedHashMap<>();
for (BehaviorDefinition behavior : behaviors) {
for (MemberDefinition prop : behavior.props) {
behaviorProps.put(prop, behavior);
}
}
overwriteMembersIfPresent(
properties,
PolymerPassStaticUtils.extractProperties(
descriptor,
DefinitionType.ObjectLiteral,
compiler,
/** constructor= */
null));
// Behaviors might get included multiple times for the same element. See test case
// testDuplicatedBehaviorsAreCopiedOnce
// In those cases, behaviorProps will have repeated names. We must remove those duplicates.
removeDuplicateBehaviorProps(behaviorProps);
// Remove behavior properties which are already present in element properties
removeBehaviorPropsOverlappingWithElementProps(behaviorProps, properties);
FeatureSet newFeatures = null;
if (!behaviors.isEmpty()) {
newFeatures = behaviors.get(0).features;
for (int i = 1; i < behaviors.size(); i++) {
newFeatures = newFeatures.union(behaviors.get(i).features);
}
}
List methods = new ArrayList<>();
for (Node keyNode = descriptor.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) {
boolean isFunctionDefinition =
keyNode.isMemberFunctionDef()
|| (keyNode.isStringKey() && keyNode.getFirstChild().isFunction());
if (isFunctionDefinition) {
methods.add(
new MemberDefinition(
NodeUtil.getBestJSDocInfo(keyNode), keyNode, keyNode.getFirstChild()));
}
}
return new PolymerClassDefinition(
DefinitionType.ObjectLiteral,
callNode,
target,
hasGeneratedLhs,
descriptor,
classInfo,
new MemberDefinition(ctorInfo, null, constructor),
nativeBaseElement,
properties,
behaviorProps,
methods,
behaviors,
newFeatures);
}
private static boolean isGoogModuleExports(Node assign) {
// Verify this is an assignment to a name `exports`
if (!assign.getParent().isExprResult() || !assign.getFirstChild().matchesName("exports")) {
return false;
}
// Verify the assignment is within either a goog.module or goog.loadModule
Node containingBlock = assign.getGrandparent();
return (containingBlock.isModuleBody()
&& containingBlock.getParent().getBooleanProp(Node.GOOG_MODULE))
|| NodeUtil.isBundledGoogModuleScopeRoot(containingBlock);
}
/**
* Adding our usual multiple assignments
*
* /** @constructor @extends {PolymerElement} * /
* var FooElement = function() {};
* FooElement = Polymer() {
*
* }
* confuses goog.module rewriting when the Polymer call is assigned to `exports. Instead
* create a new module local, and export that name.
*
* @param callNode a Polymer({}) call
* @return The new target node for the Polymer call
*/
private static Node createDummyGoogModuleExportsTarget(AbstractCompiler compiler, Node callNode) {
String madeUpName = "exportsForPolymer$jscomp" + compiler.getUniqueNameIdSupplier().get();
Node assignExpr = callNode.getGrandparent();
Node exportName = callNode.getParent().getFirstChild();
Node target = IR.name(madeUpName).clonePropsFrom(exportName).srcref(exportName);
callNode.replaceWith(target);
Node newDecl = IR.var(target.cloneNode(), callNode).srcref(assignExpr);
newDecl.insertBefore(assignExpr);
newDecl.setJSDocInfo(assignExpr.getJSDocInfo());
assignExpr.setJSDocInfo(null);
return target;
}
/**
* Validates the class definition and if valid, extracts the class definition from the AST. As
* opposed to the Polymer 1 extraction, this operation is non-destructive.
*/
@Nullable
static PolymerClassDefinition extractFromClassNode(
Node classNode, AbstractCompiler compiler, GlobalNamespace globalNames) {
checkState(classNode != null && classNode.isClass());
// The supported case is for the config getter to return an object literal descriptor.
Node propertiesDescriptor = null;
Node propertiesGetter =
NodeUtil.getFirstGetterMatchingKey(NodeUtil.getClassMembers(classNode), "properties");
if (propertiesGetter != null) {
if (!propertiesGetter.isStaticMember()) {
// report bad class definition
compiler.report(
JSError.make(classNode, PolymerPassErrors.POLYMER_CLASS_PROPERTIES_NOT_STATIC));
} else {
for (Node child =
NodeUtil.getFunctionBody(propertiesGetter.getFirstChild()).getFirstChild();
child != null;
child = child.getNext()) {
if (child.isReturn()) {
if (child.hasChildren() && child.getFirstChild().isObjectLit()) {
propertiesDescriptor = child.getFirstChild();
break;
} else {
compiler.report(
JSError.make(
propertiesGetter, PolymerPassErrors.POLYMER_CLASS_PROPERTIES_INVALID));
}
}
}
}
}
Node target;
if (NodeUtil.isNameDeclaration(classNode.getGrandparent())) {
target = IR.name(classNode.getParent().getString());
} else if (classNode.getParent().isAssign()
&& classNode.getParent().getFirstChild().isQualifiedName()) {
target = classNode.getParent().getFirstChild();
} else if (!classNode.getFirstChild().isEmpty()) {
target = classNode.getFirstChild();
} else {
// issue error - no name found
compiler.report(JSError.make(classNode, PolymerPassErrors.POLYMER_CLASS_UNNAMED));
return null;
}
JSDocInfo classInfo = NodeUtil.getBestJSDocInfo(classNode);
JSDocInfo ctorInfo = null;
Node constructor = NodeUtil.getEs6ClassConstructorMemberFunctionDef(classNode);
if (constructor != null) {
ctorInfo = NodeUtil.getBestJSDocInfo(constructor);
}
List properties =
PolymerPassStaticUtils.extractProperties(
propertiesDescriptor, DefinitionType.ES6Class, compiler, constructor);
List methods = new ArrayList<>();
for (Node keyNode = NodeUtil.getClassMembers(classNode).getFirstChild();
keyNode != null;
keyNode = keyNode.getNext()) {
if (!keyNode.isMemberFunctionDef()) {
continue;
}
methods.add(
new MemberDefinition(
NodeUtil.getBestJSDocInfo(keyNode), keyNode, keyNode.getFirstChild()));
}
return new PolymerClassDefinition(
DefinitionType.ES6Class,
classNode,
target,
/* hasGeneratedLhs= */ false,
propertiesDescriptor,
classInfo,
new MemberDefinition(ctorInfo, null, constructor),
null,
properties,
null,
methods,
null,
null);
}
/**
* Appends a list of new MemberDefinitions to the end of a list and removes any previous
* MemberDefinition in the list which has the same name as the new member.
*/
private static void overwriteMembersIfPresent(
List list, List newMembers) {
for (MemberDefinition newMember : newMembers) {
for (MemberDefinition member : list) {
if (member.name.getString().equals(newMember.name.getString())) {
list.remove(member);
break;
}
}
list.add(newMember);
}
}
/**
* Removes duplicate properties from the given map, keeping only the first property
*
* Duplicates occur when either the same behavior is transitively added multiple times to
* Polymer element, or when two unique added behaviors share a property with the same name.
*/
private static void removeDuplicateBehaviorProps(
Map behaviorProps) {
if (behaviorProps == null) {
return;
}
Iterator> behaviorsItr =
behaviorProps.entrySet().iterator();
Set seen = new HashSet<>();
while (behaviorsItr.hasNext()) {
MemberDefinition memberDefinition = behaviorsItr.next().getKey();
String propertyName = memberDefinition.name.getString();
if (!seen.add(propertyName)) {
behaviorsItr.remove();
}
}
}
/**
* Removes any behavior properties from the given map that have the same name as a property in the
* given list.
*
* For example, if a Polymer element with a property "name" depends on a behavior with a
* property "name", then this method removes the behavior property in favor of the element
* property.
*/
private static void removeBehaviorPropsOverlappingWithElementProps(
Map behaviorProps,
List polymerElementProps) {
if (behaviorProps == null) {
return;
}
Set elementPropNames =
polymerElementProps.stream().map(x -> x.name.getString()).collect(Collectors.toSet());
Iterator> behaviorsItr =
behaviorProps.entrySet().iterator();
while (behaviorsItr.hasNext()) {
MemberDefinition memberDefinition = behaviorsItr.next().getKey();
if (elementPropNames.contains(memberDefinition.name.getString())) {
behaviorsItr.remove();
}
}
}
@Override
public String toString() {
return toStringHelper(this)
.add("defType", defType)
.add("definition", definition)
.add("target", target)
.add("nativeBaseElement", nativeBaseElement)
.omitNullValues()
.toString();
}
String getInterfaceName(Supplier uniqueIdSupplier) {
if (interfaceName == null) {
interfaceName =
"Polymer"
+ target.getQualifiedName().replace('.', '_')
+ "Interface"
+ uniqueIdSupplier.get();
}
return interfaceName;
}
}