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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 2009 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;

/**
 * Strategies for how to do naming of anonymous functions that occur as
 * r-values in assignments and variable declarations.
 */
public enum AnonymousFunctionNamingPolicy {

  /** Don't give anonymous functions names */
  OFF(null),

  /**
   * Generates names that are based on the left-hand side of the assignment.
   * Runs after variable and property renaming, so that the generated names
   * will be short and obfuscated.
   * @see NameAnonymousFunctions
   */
  UNMAPPED(new char[] { NameAnonymousFunctions.DELIMITER }),

  /**
   * Generates short unique names and provides a mapping from them back to a
   * more meaningful name that's based on the left-hand side of the
   * assignment.
   * @see NameAnonymousFunctionsMapped
   */
  MAPPED(new char[] { NameAnonymousFunctionsMapped.PREFIX }),
  ;

  private final char[] reservedCharacters;

  AnonymousFunctionNamingPolicy(char[] reservedCharacters) {
    this.reservedCharacters = reservedCharacters;
  }

  /**
   * Gets characters that are reserved for use in anonymous function names and
   * can't be used in variable or property names.
   * @return reserved characters or null if no characters are reserved
   */
  public char[] getReservedCharacters() {
    // TODO(user) - for MAPPED, only the first character is reserved which
    // can be used to further optimize
    return reservedCharacters;
  }
}