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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 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;

/**
 * Convert the warnings level to an Options object.
 */
public enum WarningLevel {
  QUIET,

  DEFAULT,

  VERBOSE;

  public void setOptionsForWarningLevel(CompilerOptions options) {
    switch (this) {
      case QUIET:
        silenceAllWarnings(options);
        break;
      case DEFAULT:
        addDefaultWarnings(options);
        break;
      case VERBOSE:
        addVerboseWarnings(options);
        break;
    }
  }

  /**
   * Silence all non-essential warnings.
   */
  private static void silenceAllWarnings(CompilerOptions options) {
    // Just use a ShowByPath warnings guard, so that we don't have
    // to maintain a separate class of warnings guards for silencing warnings.
    options.addWarningsGuard(
        new ShowByPathWarningsGuard(
            "the_longest_path_that_cannot_be_expressed_as_a_string"));

    // Allow passes that aren't going to report anything to be skipped.

    options.setWarningLevel(DiagnosticGroups.MISSING_PROVIDE, CheckLevel.OFF);
    options.setCheckTypes(false);
    options.setWarningLevel(DiagnosticGroups.CHECK_TYPES, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.CHECK_USELESS_CODE, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.MISSING_RETURN, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.ACCESS_CONTROLS, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.CONST, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.CONSTANT_PROPERTY, CheckLevel.OFF);
    options.setCheckSuspiciousCode(false);
    options.setWarningLevel(DiagnosticGroups.GLOBAL_THIS, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.GLOBAL_THIS, CheckLevel.OFF);
    options.setWarningLevel(DiagnosticGroups.ES5_STRICT, CheckLevel.OFF);

    // Allows annotations that are not standard.
    options.setWarningLevel(DiagnosticGroups.NON_STANDARD_JSDOC,
        CheckLevel.OFF);
  }

  /**
   * Add the default checking pass to the compilation options.
   * @param options The CompilerOptions object to set the options on.
   */
  private static void addDefaultWarnings(CompilerOptions options) {
    options.setCheckSuspiciousCode(true);

    // Allows annotations that are not standard.
    options.setWarningLevel(DiagnosticGroups.NON_STANDARD_JSDOC,
        CheckLevel.OFF);
  }

  /**
   * Add all the check pass that are possibly relevant to a non-googler.
   * @param options The CompilerOptions object to set the options on.
   */
  private static void addVerboseWarnings(CompilerOptions options) {
    addDefaultWarnings(options);

    // checkSuspiciousCode needs to be enabled for CheckGlobalThis to get run.
    options.setCheckSuspiciousCode(true);
    options.setWarningLevel(DiagnosticGroups.GLOBAL_THIS, CheckLevel.WARNING);
    options.setCheckSymbols(true);

    // checkTypes has the side-effect of asserting that the
    // correct number of arguments are passed to a function.
    // Because the CodingConvention used with the web service does not provide a
    // way for optional arguments to be specified, these warnings may result in
    // false positives.
    options.setCheckTypes(true);
    options.setWarningLevel(DiagnosticGroups.MISSING_PROPERTIES, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.DEPRECATED, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.ES5_STRICT, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.VISIBILITY, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.CONST, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.CHECK_REGEXP, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.STRICT_MODULE_DEP_CHECK, CheckLevel.WARNING);
    options.setWarningLevel(
        DiagnosticGroups.MISSING_RETURN, CheckLevel.WARNING);

    // Kindly tell the user that they have JsDocs that we don't understand.
    options.setWarningLevel(DiagnosticGroups.NON_STANDARD_JSDOC,
        CheckLevel.WARNING);
  }
}