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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 2011 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.parsing.parser;


// 7.5 Tokens
public enum TokenType {
  END_OF_FILE("End of File"),
  ERROR("error"),

  // 7.6 Identifier Names and Identifiers
  IDENTIFIER("identifier"),

  // 7.6.1.1 keywords
  BREAK,
  CASE,
  CATCH,
  CONTINUE,
  DEBUGGER,
  DEFAULT,
  DELETE,
  DO,
  ELSE,
  FINALLY,
  FOR,
  FUNCTION,
  IF,
  IN,
  INSTANCEOF,
  NEW,
  RETURN,
  SWITCH,
  THIS,
  THROW,
  TRY,
  TYPEOF,
  VAR,
  VOID,
  WHILE,
  WITH,

  // 7.6.1.2 Future reserved words
  CLASS,
  CONST,
  ENUM,
  EXPORT,
  EXTENDS,
  IMPORT,
  SUPER,

  // Future reserved words in strict mode
  IMPLEMENTS,
  INTERFACE,
  LET,
  PACKAGE,
  PRIVATE,
  PROTECTED,
  PUBLIC,
  STATIC,
  YIELD,

  // 7.7 Punctuators
  OPEN_CURLY("{"),
  CLOSE_CURLY("}"),
  OPEN_PAREN("("),
  CLOSE_PAREN(")"),
  OPEN_SQUARE("["),
  CLOSE_SQUARE("]"),
  PERIOD("."),
  SEMI_COLON(";"),
  COMMA(","),
  OPEN_ANGLE("<"),
  CLOSE_ANGLE(">"),
  LESS_EQUAL("<="),
  GREATER_EQUAL(">="),
  ARROW("=>"),
  EQUAL_EQUAL("=="),
  NOT_EQUAL("!="),
  EQUAL_EQUAL_EQUAL("==="),
  NOT_EQUAL_EQUAL("!=="),
  PLUS("+"),
  MINUS("-"),
  STAR("*"),
  STAR_STAR("**"),
  PERCENT("%"),
  PLUS_PLUS("++"),
  MINUS_MINUS("--"),
  LEFT_SHIFT("<<"),
  RIGHT_SHIFT(">>"),
  UNSIGNED_RIGHT_SHIFT(">>>"),
  AMPERSAND("&"),
  BAR("|"),
  CARET("^"),
  BANG("!"),
  TILDE("~"),
  AND("&&"),
  OR("||"),
  QUESTION("?"),
  QUESTION_QUESTION("??"),
  QUESTION_DOT("?."),
  COLON(":"),
  EQUAL("="),
  PLUS_EQUAL("+="),
  MINUS_EQUAL("-="),
  STAR_EQUAL("*="),
  STAR_STAR_EQUAL("**="),
  PERCENT_EQUAL("%="),
  LEFT_SHIFT_EQUAL("<<="),
  RIGHT_SHIFT_EQUAL(">>="),
  UNSIGNED_RIGHT_SHIFT_EQUAL(">>>="),
  AMPERSAND_EQUAL("&="),
  BAR_EQUAL("|="),
  CARET_EQUAL("^="),
  SLASH("/"),
  SLASH_EQUAL("/="),
  POUND("#"),

  // 7.8 Literals
  NULL,
  TRUE,
  FALSE,
  NUMBER("number literal"),
  STRING("string literal"),
  BIGINT("bigint literal"),
  REGULAR_EXPRESSION("regular expression literal"),

  // Harmony extensions
  ELLIPSIS("..."),
  // 12.2.9 Template Literals
  // Template literal tokens corresponding to different parts of the literal
  // Eg: `hello` is scanned as a single NO_SUBSTITUTION_TEMPLATE: hello
  // `hello${world}!` is scanned as TEMPLATE_HEAD: hello, TEMPLATE_MIDDLE: world,
  // and TEMPLATE_TAIL: !
  TEMPLATE_HEAD("template head"),
  TEMPLATE_MIDDLE("template middle"),
  TEMPLATE_TAIL("template tail"),
  NO_SUBSTITUTION_TEMPLATE("no substitution template"),

  // TypeScript
  TYPE,
  DECLARE,
  MODULE,
  NAMESPACE
  ;

  public final String value;

  TokenType() {
    this(null);
  }

  TokenType(String value) {
    this.value = value;
  }

  @Override
  public String toString() {
    // TODO: straighten this out
    return value == null ? Keywords.get(this).toString() : value;
  }
}