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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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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 com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Table;
import com.google.javascript.jscomp.GlobalNamespace.Name;
import com.google.javascript.jscomp.GlobalNamespace.Ref;
import com.google.javascript.jscomp.PolymerPass.MemberDefinition;
import com.google.javascript.jscomp.modules.Binding;
import com.google.javascript.jscomp.modules.Module;
import com.google.javascript.jscomp.modules.ModuleMap;
import com.google.javascript.jscomp.modules.ModuleMetadataMap;
import com.google.javascript.jscomp.modules.ModuleMetadataMap.ModuleMetadata;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.QualifiedName;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.jspecify.nullness.Nullable;

/**
 * Finds the Polymer behavior definitions associated with Polymer element definitions.
 *
 * @see https://www.polymer-project.org/1.0/docs/devguide/behaviors
 */
final class PolymerBehaviorExtractor {

  private static final ImmutableSet BEHAVIOR_NAMES_NOT_TO_COPY =
      ImmutableSet.of(
          "created",
          "attached",
          "detached",
          "attributeChanged",
          "configure",
          "ready",
          "properties",
          "listeners",
          "observers",
          "hostAttributes");

  private static final String GOOG_MODULE_EXPORTS = "exports";

  private final AbstractCompiler compiler;
  private final GlobalNamespace globalNames;
  private final ModuleMetadataMap moduleMetadataMap;
  private final ModuleMap moduleMap;

  private final Table resolveMemoized =
      HashBasedTable.create();
  private final Map globalResolveMemoized =
      new LinkedHashMap<>();

  PolymerBehaviorExtractor(
      AbstractCompiler compiler,
      GlobalNamespace globalNames,
      ModuleMetadataMap moduleMetadataMap,
      ModuleMap moduleMap) {
    this.compiler = compiler;
    this.globalNames = globalNames;
    this.moduleMetadataMap = moduleMetadataMap;
    this.moduleMap = moduleMap;
  }

  /**
   * Extracts all Behaviors from an array literal, recursively. Entries in the array can be object
   * literals or array literals (of other behaviors). Behavior names must be global, fully qualified
   * names. TODO(rishipal): Make this function better handle case where the same behavior
   * transitively gets included in the same Polymer element more than once.
   *
   * @see https://github.com/Polymer/polymer/blob/0.8-preview/PRIMER.md#behaviors
   * @param moduleMetadata The module in which these behaviors are being resolved, or null if not in
   *     a module.
   * @return A list of all {@code BehaviorDefinitions} in the array.
   */
  ImmutableList extractBehaviors(
      Node behaviorArray, @Nullable ModuleMetadata moduleMetadata) {
    if (behaviorArray == null) {
      return ImmutableList.of();
    }

    if (!behaviorArray.isArrayLit()) {
      compiler.report(
          JSError.make(behaviorArray, PolymerPassErrors.POLYMER_INVALID_BEHAVIOR_ARRAY));
      return ImmutableList.of();
    }

    ImmutableList.Builder behaviors = ImmutableList.builder();
    for (Node behaviorName = behaviorArray.getFirstChild();
        behaviorName != null;
        behaviorName = behaviorName.getNext()) {
      if (behaviorName.isObjectLit()) {
        PolymerPassStaticUtils.switchDollarSignPropsToBrackets(behaviorName, compiler);
        PolymerPassStaticUtils.quoteListenerAndHostAttributeKeys(behaviorName, compiler);
        if (NodeUtil.getFirstPropMatchingKey(behaviorName, "is") != null) {
          compiler.report(JSError.make(behaviorName, PolymerPassErrors.POLYMER_INVALID_BEHAVIOR));
        }
        Node behaviorModule = NodeUtil.getEnclosingModuleIfPresent(behaviorName);
        behaviors.add(
            new BehaviorDefinition(
                PolymerPassStaticUtils.extractProperties(
                    behaviorName,
                    PolymerClassDefinition.DefinitionType.ObjectLiteral,
                    compiler,
                    /* constructor= */ null),
                getBehaviorFunctionsToCopy(behaviorName),
                getNonPropertyMembersToCopy(behaviorName),
                /* isGlobalDeclaration= */ NodeUtil.getEnclosingScopeRoot(behaviorName).isRoot(),
                (FeatureSet) NodeUtil.getEnclosingScript(behaviorName).getProp(Node.FEATURE_SET),
                behaviorModule));
        continue;
      }

      ResolveBehaviorNameResult resolveResult;
      if (isGoogModuleGetCall(behaviorName)) {
        resolveResult = resolveGoogModuleGet(behaviorName.getSecondChild().getString());
      } else {
        resolveResult =
            resolveBehaviorName(getQualifiedNameThroughCast(behaviorName), moduleMetadata);
      }
      if (resolveResult.equals(FAILED_RESOLVE_RESULT)) {
        compiler.report(JSError.make(behaviorName, PolymerPassErrors.POLYMER_UNQUALIFIED_BEHAVIOR));
        continue;
      }
      Node behaviorValue = resolveResult.node;

      if (behaviorValue.isArrayLit()) {
        // Individual behaviors can also be arrays of behaviors. Parse them recursively.
        behaviors.addAll(extractBehaviors(behaviorValue, resolveResult.moduleMetadata));
      } else if (behaviorValue.isObjectLit()) {
        PolymerPassStaticUtils.switchDollarSignPropsToBrackets(behaviorValue, compiler);
        PolymerPassStaticUtils.quoteListenerAndHostAttributeKeys(behaviorValue, compiler);
        if (NodeUtil.getFirstPropMatchingKey(behaviorValue, "is") != null) {
          compiler.report(JSError.make(behaviorValue, PolymerPassErrors.POLYMER_INVALID_BEHAVIOR));
        }
        Node behaviorModule = NodeUtil.getEnclosingModuleIfPresent(behaviorValue);
        behaviors.add(
            new BehaviorDefinition(
                PolymerPassStaticUtils.extractProperties(
                    behaviorValue,
                    PolymerClassDefinition.DefinitionType.ObjectLiteral,
                    compiler,
                    /* constructor= */ null),
                getBehaviorFunctionsToCopy(behaviorValue),
                getNonPropertyMembersToCopy(behaviorValue),
                resolveResult.isGlobalDeclaration,
                (FeatureSet) NodeUtil.getEnclosingScript(behaviorValue).getProp(Node.FEATURE_SET),
                behaviorModule));
      } else {
        compiler.report(JSError.make(behaviorName, PolymerPassErrors.POLYMER_UNQUALIFIED_BEHAVIOR));
      }
    }
    return behaviors.build();
  }

  private static class ResolveBehaviorNameResult {
    final Node node;
    final boolean isGlobalDeclaration;
    final ModuleMetadata moduleMetadata;

    ResolveBehaviorNameResult(
        @Nullable Node node, boolean isGlobalDeclaration, @Nullable ModuleMetadata moduleMetadata) {
      this.node = node;
      this.isGlobalDeclaration = isGlobalDeclaration;
      this.moduleMetadata = moduleMetadata;
    }
  }

  private static final ResolveBehaviorNameResult FAILED_RESOLVE_RESULT =
      new ResolveBehaviorNameResult(null, false, null);

  /**
   * Resolve an identifier, which is presumed to refer to a Polymer Behavior declaration, using the
   * global namespace. Recurses to resolve assignment chains of any length.
   *
   * 

This method memoizes {@link #resolveBehaviorNameInternal(String, ModuleMetadata)} * * @param name the name of the identifier, which may be qualified. * @param moduleMetadata the module (ES module or goog.module) this name is resolved in, or null * if not in a module. * @return The behavior declaration node, or {@link #FAILED_RESOLVE_RESULT} if it couldn't be * resolved. */ private ResolveBehaviorNameResult resolveBehaviorName( @Nullable String name, @Nullable ModuleMetadata moduleMetadata) { if (name == null) { return FAILED_RESOLVE_RESULT; } ResolveBehaviorNameResult memoized = moduleMetadata != null ? resolveMemoized.get(name, moduleMetadata) : globalResolveMemoized.get(name); if (memoized == null) { memoized = checkNotNull(resolveBehaviorNameInternal(name, moduleMetadata)); if (moduleMetadata != null) { resolveMemoized.put(name, moduleMetadata, memoized); } else { globalResolveMemoized.put(name, memoized); } } return memoized; } /** * Implements behavior resolution. Call {@link #resolveBehaviorName(String, ModuleMetadata)}} * instead. */ private ResolveBehaviorNameResult resolveBehaviorNameInternal( String name, ModuleMetadata moduleMetadata) { // Check if this name is a module import/require. ResolveBehaviorNameResult result = getNameIfModuleImport(name, moduleMetadata); if (result != null) { return result; } // Check if this name is possibly from a legacy goog.module ResolveBehaviorNameResult legacyResolve = resolveReferenceToLegacyGoogModule(name); if (legacyResolve != null) { return legacyResolve; } // If not, look it up within the current module. Name moduleLevelName = moduleMetadata != null ? globalNames.getNameFromModule(moduleMetadata, name) : null; Name globalName = moduleLevelName == null ? globalNames.getSlot(name) : moduleLevelName; if (globalName == null) { return FAILED_RESOLVE_RESULT; } // Whether the declaration of this node is in the top-level global scope, as opposed to a module // or an IIFE. boolean isGlobalDeclaration = moduleLevelName == null; // Use any set as a backup declaration, even if it's local. Ref declarationRef = globalName.getDeclaration(); if (declarationRef == null) { for (Ref ref : globalName.getRefs()) { if (ref.isSet()) { isGlobalDeclaration = false; declarationRef = ref; break; } } } if (declarationRef == null) { return FAILED_RESOLVE_RESULT; } Node declarationNode = declarationRef.getNode(); if (declarationNode == null) { return FAILED_RESOLVE_RESULT; } Node rValue = NodeUtil.getRValueOfLValue(declarationNode); if (rValue == null) { return FAILED_RESOLVE_RESULT; } if (rValue.isQualifiedName()) { // Another identifier; recurse. Scope declarationScope = declarationRef.scope.getClosestHoistScope(); Module m = ModuleImportResolver.getModuleFromScopeRoot( compiler.getModuleMap(), compiler, declarationScope.getRootNode()); return resolveBehaviorName( getQualifiedNameThroughCast(rValue), m != null ? m.metadata() : null); } JSDocInfo behaviorInfo = NodeUtil.getBestJSDocInfo(declarationNode); if (behaviorInfo == null || !behaviorInfo.isPolymerBehavior()) { compiler.report( JSError.make(declarationNode, PolymerPassErrors.POLYMER_UNANNOTATED_BEHAVIOR)); } return new ResolveBehaviorNameResult(rValue, isGlobalDeclaration, moduleMetadata); } /** * Handles resolving behaviors if they are references to legacy modules * *

Returns null if the name is not from a legacy module, and resolution should continue * normally. */ private @Nullable ResolveBehaviorNameResult resolveReferenceToLegacyGoogModule(String name) { int dot = name.length(); while (dot >= 0) { String subNamespace = name.substring(0, dot); ModuleMetadata metadata = moduleMetadataMap.getModulesByGoogNamespace().get(subNamespace); if (metadata == null || !metadata.isLegacyGoogModule()) { dot = name.lastIndexOf('.', dot - 1); continue; } String rest = dot == name.length() ? "" : name.substring(dot); ResolveBehaviorNameResult result = resolveBehaviorName(GOOG_MODULE_EXPORTS + rest, metadata); // TODO(lharker): Remove this check and just fail to resolve once we have moved module // rewriting unconditionally after the PolymerPass. return result.equals(FAILED_RESOLVE_RESULT) ? null : result; } return null; } private static final QualifiedName GOOG_MODULE_GET = QualifiedName.of("goog.module.get"); private static boolean isGoogModuleGetCall(Node callNode) { if (!callNode.isCall()) { return false; } return GOOG_MODULE_GET.matches(callNode.getFirstChild()) && callNode.hasTwoChildren() && callNode.getSecondChild().isStringLit(); } private ResolveBehaviorNameResult resolveGoogModuleGet(String moduleNamespace) { ModuleMetadata closureModule = moduleMetadataMap.getModulesByGoogNamespace().get(moduleNamespace); if (closureModule == null) { // Invalid goog.module.get() call. return FAILED_RESOLVE_RESULT; } else if (closureModule.isGoogProvide()) { return resolveBehaviorName(moduleNamespace, null); } checkState(closureModule.isGoogModule(), closureModule); return resolveBehaviorName(GOOG_MODULE_EXPORTS, closureModule); } /** * Handles resolving behaviors whose root is imported from another module or a provide. * *

Returns null if the given name is not imported or {@link #FAILED_RESOLVE_RESULT} if it is * imported but is not annotated @polymerBehavior. */ private @Nullable ResolveBehaviorNameResult getNameIfModuleImport( String name, ModuleMetadata metadata) { if (metadata == null || (!metadata.isEs6Module() && !metadata.isGoogModule())) { return null; } Module module = metadata.isGoogModule() ? moduleMap.getClosureModule(metadata.googNamespaces().asList().get(0)) : moduleMap.getModule(metadata.path()); checkNotNull(module, metadata); int dot = name.indexOf('.'); String root = dot == -1 ? name : name.substring(0, dot); Binding b = module.boundNames().get(root); if (b == null || !b.isSomeImport()) { return null; } String rest = dot == -1 ? "" : name.substring(dot); if (b.isModuleNamespace()) { // `import * as x from '';` or `const ns = goog.require('...` return resolveModuleNamespaceBinding(b, rest); } ModuleMetadata importMetadata = b.originatingExport().moduleMetadata(); String originatingName; // The name in the module being imported if (importMetadata.isEs6Module()) { // import {exportName} from './mod'; originatingName = b.originatingExport().localName() + rest; } else if (importMetadata.isGoogModule()) { // `const {exportName: localName} = goog.require('some.module');` originatingName = GOOG_MODULE_EXPORTS + "." + b.originatingExport().exportName() + rest; } else { // `const {exportName: localName} = goog.require('some.provide');` checkState(importMetadata.isGoogProvide(), importMetadata); originatingName = b.closureNamespace() + "." + b.originatingExport().exportName() + rest; } return resolveBehaviorName(originatingName, importMetadata); } /** Resolves a name that imports the 'namespace' of a module or provide. */ private ResolveBehaviorNameResult resolveModuleNamespaceBinding(Binding b, String rest) { if (b.metadata().isGoogModule()) { return resolveBehaviorName(GOOG_MODULE_EXPORTS + rest, b.metadata()); } else if (b.metadata().isGoogProvide()) { return resolveBehaviorName(b.closureNamespace() + rest, b.metadata()); } // ES module import *. checkState(b.metadata().isEs6Module()); if (rest.isEmpty()) { // The namespace imported by `import *` is never a @polymerBehavior. return FAILED_RESOLVE_RESULT; } rest = rest.substring(1); // Remove leading '.'. int dot = rest.indexOf('.'); // Given: // `const internalName = 0; export {internalName as exportName};` // `import * as mod from './x'; use(mod.exportName.Behavior);` // 1. get the internal name `internalName` from` exportName`. // 2. then proceed to resolve `internalName.Behavior` in './x'. String exportedName = dot == -1 ? rest : rest.substring(0, dot); Module originalModule = moduleMap.getModule(b.metadata().path()); Binding exportBinding = originalModule.namespace().get(exportedName); if (exportBinding == null || !exportBinding.isCreatedByEsExport()) { // This is an invalid import, and will cause an error elsewhere. return FAILED_RESOLVE_RESULT; } return resolveBehaviorName( exportBinding.originatingExport().localName() + (dot == -1 ? "" : rest.substring(dot)), b.metadata()); } /** * @return A list of functions from a behavior which should be copied to the element prototype. */ private static ImmutableList getBehaviorFunctionsToCopy(Node behaviorObjLit) { checkState(behaviorObjLit.isObjectLit()); ImmutableList.Builder functionsToCopy = ImmutableList.builder(); for (Node keyNode = behaviorObjLit.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) { boolean isFunctionDefinition = (keyNode.isStringKey() && keyNode.getFirstChild().isFunction()) || keyNode.isMemberFunctionDef(); if (isFunctionDefinition && !BEHAVIOR_NAMES_NOT_TO_COPY.contains(keyNode.getString())) { functionsToCopy.add( new MemberDefinition( NodeUtil.getBestJSDocInfo(keyNode), keyNode, keyNode.getFirstChild())); } } return functionsToCopy.build(); } /** * Similar to {@link Node#getQualifiedName} but also handles CAST nodes. For example, given a * GETPROP representing "(/** @type {?} *\/ (x)).y.z" returns "x.y.z". Returns null if node is not * a NAME, GETPROP, or CAST. See b/64389806 for Polymer-specific context. */ private static @Nullable String getQualifiedNameThroughCast(Node node) { if (node.isName()) { String name = node.getString(); return name.isEmpty() ? null : name; } else if (node.isGetProp()) { String left = getQualifiedNameThroughCast(node.getFirstChild()); if (left == null) { return null; } String right = node.getString(); return left + "." + right; } else if (node.isCast()) { return getQualifiedNameThroughCast(node.getFirstChild()); } return null; } /** * @return A list of MemberDefinitions in a behavior which are not in the properties block, but * should still be copied to the element prototype. */ private static ImmutableList getNonPropertyMembersToCopy(Node behaviorObjLit) { checkState(behaviorObjLit.isObjectLit()); ImmutableList.Builder membersToCopy = ImmutableList.builder(); for (Node keyNode = behaviorObjLit.getFirstChild(); keyNode != null; keyNode = keyNode.getNext()) { boolean isNonFunctionMember = keyNode.isGetterDef() || (keyNode.isStringKey() && !keyNode.getFirstChild().isFunction()); if (isNonFunctionMember && !BEHAVIOR_NAMES_NOT_TO_COPY.contains(keyNode.getString())) { membersToCopy.add( new MemberDefinition( NodeUtil.getBestJSDocInfo(keyNode), keyNode, keyNode.getFirstChild())); } } return membersToCopy.build(); } /** * Parsed definition of a Polymer Behavior. Includes members which should be copied to elements * which use the behavior. */ static final class BehaviorDefinition { /** Properties declared in the behavior 'properties' block. */ final List props; /** Functions intended to be copied to elements which use this Behavior. */ final List functionsToCopy; /** Other members intended to be copied to elements which use this Behavior. */ final List nonPropertyMembersToCopy; /** Whether this Behavior is declared in the global scope. */ final boolean isGlobalDeclaration; /** Language features to carry over to the extraction destination. */ final FeatureSet features; /** Containing MODULE_BODY if this behavior is defined inside a module, otherwise null */ final Node behaviorModule; BehaviorDefinition( List props, List functionsToCopy, List nonPropertyMembersToCopy, boolean isGlobalDeclaration, FeatureSet features, Node behaviorModule) { this.props = props; this.functionsToCopy = functionsToCopy; this.nonPropertyMembersToCopy = nonPropertyMembersToCopy; this.isGlobalDeclaration = isGlobalDeclaration; this.features = features; this.behaviorModule = behaviorModule; } } }





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