com.google.javascript.jscomp.PolymerBehaviorExtractor Maven / Gradle / Ivy
Show all versions of closure-compiler Show documentation
/*
* 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.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.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 HashMap<>();
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.children()) {
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(
Node node, boolean isGlobalDeclaration, 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, 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 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().isString();
}
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 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.children()) {
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.
*/
@Nullable
private static 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.getLastChild().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.children()) {
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;
}
}
}