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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 2014 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 com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableSet;
import com.google.errorprone.annotations.Immutable;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.NominalTypeBuilder;
import com.google.javascript.rhino.QualifiedName;
import com.google.javascript.rhino.jstype.FunctionType;

/** Coding convention used by the Chrome team to compile Chrome's JS. */
@Immutable
public final class ChromeCodingConvention extends CodingConventions.Proxy {
  private final ImmutableSet indirectlyDeclaredProperties;

  public ChromeCodingConvention() {
    this(CodingConventions.getDefault());
  }

  public ChromeCodingConvention(CodingConvention wrapped) {
    super(wrapped);
    indirectlyDeclaredProperties =
        new ImmutableSet.Builder()
            .add("instance_", "getInstance")
            .addAll(wrapped.getIndirectlyDeclaredProperties())
            .build();
  }

  private static final QualifiedName CR_ADD_SINGLETON_GETTER =
      QualifiedName.of("cr.addSingletonGetter");

  @Override
  public String getSingletonGetterClassName(Node callNode) {
    Node callArg = callNode.getFirstChild();
    if (!CR_ADD_SINGLETON_GETTER.matches(callArg) || !callNode.hasTwoChildren()) {
      return super.getSingletonGetterClassName(callNode);
    }
    return callArg.getNext().getQualifiedName();
  }

  @Override
  public void applySingletonGetter(NominalTypeBuilder classType, FunctionType getterType) {
    Node defSite = classType.constructor().getSource();
    classType.declareConstructorProperty("getInstance", getterType, defSite);
    classType.declareConstructorProperty("instance_", classType.instance(), defSite);
  }

  @Override
  public ImmutableCollection getIndirectlyDeclaredProperties() {
    return indirectlyDeclaredProperties;
  }
}