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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2013 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.ImmutableSet;
import com.google.javascript.rhino.Node;

import java.util.Collection;

/**
 * Disambiguate properties by file, when they are private by naming convention.
 *
 * This pass is unsafe. When some code doesn't respect the coding convention,
 * the pass silently breaks the code.
 * Projects who use this pass must also turn on CheckAccessControls for code
 * using the coding convention (by default CheckAccessControls looks only at
 * jsdoc annotations).
 *
 * If someone plans to make this pass non-experimental, or turn it on by
 * default, they should modify CheckAccessControls to store violations, and use
 * that list here to back-off renaming, like DisambiguateProperties does.
 *
 * Another option is that, in CompilerOptionsPreprocessor, if this pass is
 * enabled, but the access controls are not, to throw an error.
 */
class DisambiguatePrivateProperties
   implements NodeTraversal.Callback, CompilerPass {

  private final AbstractCompiler compiler;
  private final CodingConvention convention;
  private final ImmutableSet blacklist;
  private String fileid;
  private int id = 0;

  DisambiguatePrivateProperties(AbstractCompiler compiler) {
    this.compiler = compiler;
    this.convention = this.compiler.getCodingConvention();
    Collection indirect = convention.getIndirectlyDeclaredProperties();
    blacklist = ImmutableSet.copyOf(indirect);
  }

  @Override
  public void process(Node externs, Node root) {
    NodeTraversal.traverseEs6(compiler, root, this);
  }

  @Override
  public boolean shouldTraverse(NodeTraversal t, Node n, Node parent) {
    if (n.isScript()) {
      this.fileid = "$" + this.id++;
    }
    return true;
  }

  @Override
  public void visit(NodeTraversal t, Node n, Node parent) {
    switch (n.getToken()) {
      case GETPROP:
        maybeRename(n.getLastChild());
        break;
      case STRING_KEY:
      case GETTER_DEF:
      case SETTER_DEF:
      case MEMBER_FUNCTION_DEF:
        maybeRename(n);
        break;
      default:
        break;
    }
  }

  private void maybeRename(Node n) {
    String prop = n.getString();
    if (!n.getBooleanProp(Node.QUOTED_PROP) && this.convention.isPrivate(prop)
        && !blacklist.contains(prop)) {
      n.setString(prop + fileid);
      compiler.reportChangeToEnclosingScope(n);
    }
  }
}