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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;

import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
import com.google.javascript.jscomp.parsing.parser.util.SourceRange;

/**
 * A Token in a javascript file.
 * Immutable.
 * A plain old data structure. Should contain data members and simple accessors only.
 */
public class Token {

  public final SourceRange location;
  public final TokenType type;

  public Token(TokenType type, SourceRange location) {
    this.type = type;
    this.location = location;
  }

  public SourcePosition getStart() {
    return location.start;
  }

  @Override
  public String toString() {
    return type.toString();
  }

  public IdentifierToken asIdentifier() { return (IdentifierToken) this; }
  public LiteralToken asLiteral() { return (LiteralToken) this; }

  public TemplateLiteralToken asTemplateLiteral() {
    return (TemplateLiteralToken) this;
  }
}