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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 2008 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.debugger.common;

import static java.util.Comparator.comparing;

import com.google.javascript.jscomp.AnonymousFunctionNamingPolicy;
import com.google.javascript.jscomp.CheckLevel;
import com.google.javascript.jscomp.CompilerOptions;
import com.google.javascript.jscomp.CompilerOptions.PropertyCollapseLevel;
import com.google.javascript.jscomp.CompilerOptions.Reach;
import com.google.javascript.jscomp.DiagnosticGroup;
import com.google.javascript.jscomp.DiagnosticGroups;
import com.google.javascript.jscomp.PropertyRenamingPolicy;
import com.google.javascript.jscomp.VariableRenamingPolicy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;

/**
 * An enum of boolean CGI parameters to the compilation.
 *
 * @author [email protected] (Nick Santos)
 */
public enum CompilationParam {
  ENABLE_ALL_DIAGNOSTIC_GROUPS(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        for (DiagnosticGroup group : new DiagnosticGroups().getRegisteredGroups().values()) {
          options.setWarningLevel(group, CheckLevel.WARNING);
        }
      }
    }

    @Override
    public String getJavaInfo() {
      return "Sets all registered DiagnosticGroups to CheckLevel.WARNING";
    }
  },

  /** If true, the output language is ES5. If false, we skip transpilation. */
  TRANSPILE(true, ParamGroup.TRANSPILATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setLanguageIn(CompilerOptions.LanguageMode.ECMASCRIPT_2017);
      options.setLanguageOut(
          value
              ? CompilerOptions.LanguageMode.ECMASCRIPT5
              : CompilerOptions.LanguageMode.NO_TRANSPILE);
    }

    @Override
    public String getJavaInfo() {
      return "options.setLanguageOut(LanguageMode.ECMASCRIPT5)";
    }
  },

  /** If true, skip all passes aside from transpilation-related ones. */
  SKIP_NON_TRANSPILATION_PASSES(ParamGroup.TRANSPILATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setSkipNonTranspilationPasses(value);
    }
  },

  // --------------------------------
  // Checks
  // --------------------------------

  /** Checks types on expressions */
  CHECK_TYPES(true, ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCheckTypes(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.checkTypes;
    }
  },

  /** Checks types on expressions more strictly */
  STRICT_CHECK_TYPES(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.STRICT_CHECK_TYPES, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("STRICT_CHECK_TYPES");
    }
  },

  /** Skip all optimizations & non-checks, and don't output code. */
  CHECKS_ONLY(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setChecksOnly(value);
      options.setOutputJs(
          value ? CompilerOptions.OutputJs.SENTINEL : CompilerOptions.OutputJs.NORMAL);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("CHECKS_ONLY");
    }
  },

  /** Checks visibility. */
  CHECK_CONSTANTS(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(DiagnosticGroups.CONST, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("CONST");
    }
  },

  /** Checks deprecation. */
  CHECK_DEPRECATED(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.DEPRECATED, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("DEPRECATED");
    }
  },

  /** Checks es5strict. */
  CHECK_ES5_STRICT(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.ES5_STRICT, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("ES5_STRICT");
    }
  },

  /** Checks the integrity of references to qualified global names. (e.g. "a.b") */
  CHECK_GLOBAL_NAMES(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCheckGlobalNamesLevel(value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return "options.setCheckGlobalNamesLevel(CheckLevel.WARNING)";
    }
  },

  /**
   * Checks for certain uses of the {@code this} keyword that are considered unsafe because they are
   * likely to reference the global {@code this} object unintentionally.
   */
  CHECK_GLOBAL_THIS(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCheckGlobalThisLevel(value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return "options.setCheckGlobalThisLevel(CheckLevel.WARNING)";
    }
  },

  CHECK_LINT(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        options.setWarningLevel(DiagnosticGroups.LINT_CHECKS, CheckLevel.WARNING);
      }
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("LINT_CHECKS");
    }
  },

  /** Checks missing return */
  CHECK_MISSING_RETURN(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.MISSING_RETURN, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return false;
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("MISSING_RETURN");
    }
  },

  /** Checks for unreachable code */
  CHECK_UNREACHABLE_CODE(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.CHECK_USELESS_CODE, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("CHECK_USELESS_CODE");
    }
  },

  // --------------------------------
  // Optimizations
  // --------------------------------

  /** Checks for missing goog.provides() calls * */
  CHECK_PROVIDES(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.MISSING_PROVIDE, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("MISSING_PROVIDE");
    }
  },

  /** Checks for missing goog.require() calls */
  CHECK_REQUIRES(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.MISSING_REQUIRE, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("MISSING_REQUIRE");
    }
  },

  /**
   * Flags a warning if a property is missing the @override annotation, but it overrides a base
   * class property.
   */
  CHECK_REPORT_MISSING_OVERRIDE(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.MISSING_OVERRIDE, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return "options.setReportMissingOverride(CheckLevel.WARNING)";
    }
  },

  /** Checks for suspicious statements that have no effect */
  CHECK_SUSPICIOUS_CODE(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCheckSuspiciousCode(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.checkSuspiciousCode;
    }
  },

  /** Checks that all symbols are defined */
  CHECK_SYMBOLS(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCheckSymbols(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.checkSymbols;
    }
  },

  /** Checks visibility. */
  CHECK_VISIBILITY(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.VISIBILITY, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("VISIBILITY");
    }
  },

  /** Checks for missing properties */
  MISSING_PROPERTIES(ParamGroup.ERROR_CHECKING) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setWarningLevel(
          DiagnosticGroups.MISSING_PROPERTIES, value ? CheckLevel.WARNING : CheckLevel.OFF);
    }

    @Override
    public String getJavaInfo() {
      return diagGroupWarningInfo("MISSING_PROPERTIES");
    }
  },

  /**
   * Aliases all string literals to global instances, to avoid creating more objects than necessary
   * (if true, overrides any set of strings passed in to aliasableStrings)
   */
  ALIAS_ALL_STRINGS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setAliasAllStrings(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.aliasAllStrings;
    }
  },

  AMBIGUATE_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setAmbiguateProperties(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldAmbiguateProperties();
    }
  },

  /** Merge two variables together as one. */
  COALESCE_VARIABLE_NAMES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCoalesceVariableNames(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.coalesceVariableNames;
    }
  },

  /** Collapses multiple variable declarations into one */
  COLLAPSE_VARIABLE_DECLARATIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCollapseVariableDeclarations(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.collapseVariableDeclarations;
    }
  },

  /** Collapses anonymous function expressions into named function declarations */
  COLLAPSE_ANONYMOUS_FUNCTIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCollapseAnonymousFunctions(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.collapseAnonymousFunctions;
    }
  },

  /** Flattens multi-level property names (e.g. a$b = x) */
  COLLAPSE_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCollapsePropertiesLevel(
          value ? PropertyCollapseLevel.ALL : PropertyCollapseLevel.NONE);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldCollapseProperties();
    }
  },

  /** Flattens object literals in local scopes (e.g. a$b = x) */
  COLLAPSE_OBJECT_LITERALS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCollapseObjectLiterals(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.getCollapseObjectLiterals();
    }
  },

  COMPUTE_FUNCTION_SIDE_EFFECTS(ParamGroup.OPTIMIZATION){
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setComputeFunctionSideEffects(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.computeFunctionSideEffects;
    }
  },

  /** Converts quoted property accesses to dot syntax (a['b'] -> a.b) */
  CONVERT_TO_DOTTED_PROPERTIES(ParamGroup.OPTIMIZATION){
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setConvertToDottedProperties(value);
    }

    @Override
    public String getJavaInfo() {
      return "options.setConvertToDottedProperties(true)";
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.convertToDottedProperties;
    }
  },

  CROSS_CHUNK_CODE_MOTION(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCrossChunkCodeMotion(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldRunCrossChunkCodeMotion();
    }
  },

  CROSS_CHUNK_METHOD_MOTION(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setCrossChunkMethodMotion(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldRunCrossChunkMethodMotion();
    }
  },

  DEAD_ASSIGNMENT_ELIMINATION(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setDeadAssignmentElimination(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.deadAssignmentElimination;
    }
  },

  DEVIRTUALIZE_PROTOTYPE_METHODS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setDevirtualizePrototypeMethods(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.devirtualizePrototypeMethods;
    }
  },

  DISAMBIGUATE_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setDisambiguateProperties(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldDisambiguateProperties();
    }
  },
  /** Extracts common prototype member declarations */
  EXTRACT_PROTOTYPE_MEMBER_DECLARATIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setExtractPrototypeMemberDeclarations(value);
    }
  },

  /** Folds constants (e.g. (2 + 3) to 5) */
  FOLD_CONSTANTS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setFoldConstants(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.foldConstants;
    }
  },

  /** Inlines constants (symbols that are all CAPS) */
  INLINE_CONSTANTS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setInlineConstantVars(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.inlineConstantVars;
    }

    @Override
    public String getJavaInfo() {
      return "options.setInlineConstantVars(true)";
    }
  },

  /** Inlines functions */
  INLINE_FUNCTIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setInlineFunctions(value ? Reach.ALL : Reach.NONE);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.getInlineFunctionsLevel() == Reach.ALL;
    }

    @Override
    public String getJavaInfo() {
      return "options.setInlineFunctions(Reach.ALL)";
    }
  },

  INLINE_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setInlineProperties(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldInlineProperties();
    }
  },

  /** Inlines variables */
  INLINE_VARIABLES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setInlineVariables(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.inlineVariables;
    }
  },

  /** Controls label renaming. */
  LABEL_RENAMING(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setLabelRenaming(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.labelRenaming;
    }
  },

  OPTIMIZE_CALLS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setOptimizeCalls(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.optimizeCalls;
    }
  },

  /** Removes abstract methods */
  REMOVE_ABSTRACT_METHODS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRemoveAbstractMethods(value);
    }

    @Override
    public String getJavaInfo() {
      return "options.setRemoveAbstractMethods(true)";
    }
  },

  /** Removes code that will never execute */
  REMOVE_DEAD_CODE(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRemoveDeadCode(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.removeDeadCode;
    }
  },

  /** Removes unused static class prototypes */
  REMOVE_UNUSED_CLASS_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRemoveUnusedClassProperties(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.removeUnusedClassProperties;
    }
  },

  /** Removes unused member prototypes */
  REMOVE_UNUSED_PROTOTYPE_PROPERTIES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRemoveUnusedPrototypeProperties(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.removeUnusedPrototypeProperties;
    }
  },

  /** Tells AnalyzePrototypeProperties it can remove externed props. */
  REMOVE_UNUSED_PROTOTYPE_PROPERTIES_IN_EXTERNS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRemoveUnusedPrototypePropertiesInExterns(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.removeUnusedPrototypePropertiesInExterns;
    }
  },

  /** Removes unused variables */
  REMOVE_UNUSED_VARIABLES(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        options.setRemoveUnusedVariables(Reach.ALL);
      } else {
        options.setRemoveUnusedVariables(Reach.NONE);
      }
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.removeUnusedVars;
    }
  },

  REWRITE_FUNCTION_EXPRESSIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setRewriteFunctionExpressions(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.rewriteFunctionExpressions;
    }
  },

  /** Removes code associated with unused global names */
  SMART_NAME_REMOVAL(ParamGroup.OPTIMIZATION){
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setSmartNameRemoval(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.smartNameRemoval;
    }
  },

  /** Enables a number of peephole optimizations */
  USE_TYPES_FOR_LOCAL_OPTIMIZATION(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setUseTypesForLocalOptimization(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldUseTypesForLocalOptimization();
    }

    @Override
    public String getJavaInfo() {
      return "options.setUseTypesForLocalOptimization(true)";
    }
  },

  /** If true, rename all variables */
  VARIABLE_RENAMING(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setVariableRenaming(value ? VariableRenamingPolicy.ALL : VariableRenamingPolicy.OFF);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.variableRenaming == VariableRenamingPolicy.ALL;
    }

    @Override
    public String getJavaInfo() {
      return "options.setVariableRenaming(VariableRenamingPolicy.ALL)";
    }
  },

  PROPERTY_RENAMING(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setPropertyRenaming(
          value ? PropertyRenamingPolicy.ALL_UNQUOTED : PropertyRenamingPolicy.OFF);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.getPropertyRenaming() == PropertyRenamingPolicy.ALL_UNQUOTED;
    }

    @Override
    public String getJavaInfo() {
      return "options.setPropertyRenaming(PropertyRenamingPolicy.ALL_UNQUOTED)";
    }
  },

  /** Move top level function declarations to the top */
  MOVE_FUNCTION_DECLARATIONS(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setMoveFunctionDeclarations(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.moveFunctionDeclarations;
    }
  },

  GENERATE_EXPORTS(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setGenerateExports(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.generateExports;
    }
  },

  ALLOW_LOCAL_EXPORTS(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setExportLocalPropertyDefinitions(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.shouldExportLocalPropertyDefinitions();
    }

    @Override
    public String getJavaInfo() {
      return "options.setExportLocalPropertyDefinitions(true)";
    }
  },

  SYNTHETIC_BLOCK_MARKER(ParamGroup.OPTIMIZATION) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        options.setSyntheticBlockStartMarker("start");
        options.setSyntheticBlockEndMarker("end");
      } else {
        options.setSyntheticBlockStartMarker(null);
        options.setSyntheticBlockEndMarker(null);
      }
    }

    @Override
    public String getJavaInfo() {
      return "options.setSyntheticBlockStartMarker(\"start\") + "
          + "options.setSyntheticBlockEndMarker(\"end\")";
    }
  },

  /** Process @ngInject directive */
  ANGULAR_PASS(ParamGroup.SPECIAL_PASSES) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setAngularPass(value);
    }
  },

  CHROME_PASS(ParamGroup.SPECIAL_PASSES) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setChromePass(value);
    }
  },

  /** Processes goog.provide() and goog.require() calls */
  CLOSURE_PASS(true, ParamGroup.SPECIAL_PASSES) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setClosurePass(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.closurePass;
    }
  },

  POLYMER_PASS(ParamGroup.SPECIAL_PASSES) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setPolymerVersion(value ? 1 : null);
    }
  },

  /** Generate pseudo names for properties (for debugging purposes) */
  GENERATE_PSEUDO_NAMES(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setGeneratePseudoNames(value);
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.generatePseudoNames;
    }
  },

  /** Give anonymous functions names for easier debugging */
  NAME_ANONYMOUS_FUNCTIONS(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        options.setAnonymousFunctionNaming(AnonymousFunctionNamingPolicy.UNMAPPED);
      }
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.anonymousFunctionNaming == AnonymousFunctionNamingPolicy.UNMAPPED;
    }

    @Override
    public String getJavaInfo() {
      return "options.setAnonymousFunctionNaming(AnonymousFunctionNamingPolicy.UNMAPPED)";
    }
  },

  /** Give anonymous functions mapped names for easier debugging */
  NAME_ANONYMOUS_FUNCTIONS_MAPPED(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      if (value) {
        options.setAnonymousFunctionNaming(AnonymousFunctionNamingPolicy.MAPPED);
      }
    }

    @Override
    public boolean isApplied(CompilerOptions options) {
      return options.anonymousFunctionNaming == AnonymousFunctionNamingPolicy.MAPPED;
    }

    @Override
    public String getJavaInfo() {
      return "options.setAnonymousFunctionNaming(AnonymousFunctionNamingPolicy.MAPPED)";
    }
  },

  /** Configures the compiler for use as an IDE backend. */
  IDE_MODE(ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setIdeMode(value);
    }
  },

  PRESERVE_TYPE_ANNOTATIONS(true, ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setPreserveTypeAnnotations(value);
    }
  },

  /** Ouput in pretty indented format */
  PRETTY_PRINT(true, ParamGroup.MISC) {
    @Override
    public void apply(CompilerOptions options, boolean value) {
      options.setPrettyPrint(value);
    }
  };

  /** Groups parameters into associated types */
  public enum ParamGroup {
    ERROR_CHECKING("Lint and Error Checking"),
    TRANSPILATION("Transpilation"),
    OPTIMIZATION("Optimization"),
    SPECIAL_PASSES("Specialized Passes"),
    MISC("Other");

    public final String name;

    ParamGroup(String name) {
      this.name = name;
    }
  }

  private final boolean defaultValue; // default is false.
  private final ParamGroup group;

  CompilationParam(ParamGroup group) {
    this(false, group);
  }

  CompilationParam(boolean defaultValue, ParamGroup group) {
    this.defaultValue = defaultValue;
    this.group = group;
  }

  /** Returns the default value. */
  public boolean getDefaultValue() {
    return defaultValue;
  }

  /**
   * Optionally returns a hint about the Java API methods/options this param affects, currently
   * implemented for all params where the enum name doesn't directly match to a camel case method
   * CompilerOptions.setSomethingOrOther(true), such as for diagnostic groups or where the option
   * method name has changed. To assist external developers who are trying to correlate their own
   * Java API driven compilation options to the debugger's options when creating reproducible issue
   * reports.
   */
  public String getJavaInfo() {
    return null;
  }

  private static String diagGroupWarningInfo(String diagGroupsMember) {
    return "options.setWarningLevel(DiagnosticGroups." + diagGroupsMember + ", CheckLevel.WARNING)";
  }

  static CompilationParam[] getSortedValues() {
    ArrayList values = new ArrayList<>(Arrays.asList(CompilationParam.values()));

    Collections.sort(values, comparing(CompilationParam::toString));

    return values.toArray(new CompilationParam[0]);
  }

  public static Map getGroupedSortedValues() {
    Map compilationParamsByGroup = new EnumMap<>(ParamGroup.class);

    for (ParamGroup group : ParamGroup.values()) {
      List groupParams = new ArrayList<>();
      for (CompilationParam param : CompilationParam.values()) {
        if (param.group == group) {
          groupParams.add(param);
        }
      }
      compilationParamsByGroup.put(group, groupParams.toArray(new CompilationParam[0]));
    }

    return compilationParamsByGroup;
  }

  /** Applies a CGI parameter to the options. */
  public abstract void apply(CompilerOptions options, boolean value);

  /**
   * Only need to override this if the flag is affected by the presets (ADVANCED, WHITESPACE etc).
   */
  public boolean isApplied(CompilerOptions options) {
    return false;
  }
}