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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 2015 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 java.util.regex;

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

/**
 * GWT-compatible minimal replacement for {@code Matcher}
 *
 * @author [email protected] (Michael Zhou)
 */
public class Matcher {
  private final RegExp regExp;
  private String input;
  private MatchResult result;
  private boolean hasExecuted;
  private int findFromIndex;

  Matcher(RegExp regExp, String input) {
    this.regExp = regExp;
    this.input = input;
    this.result = null;
    this.hasExecuted = false;
    this.findFromIndex = 0;
  }

  public boolean matches() {
    result = regExp.exec(input);
    hasExecuted = true;
    findFromIndex = 0;

    if (result != null) {
      String match = result.getGroup(0);
      if (match.equals(input)) {
        return true;
      }
      result = null;  // matches() needs to match whole string, pretend we didn't match
    }
    return false;
  }

  public boolean find() {
    result = regExp.exec(input.substring(findFromIndex));
    hasExecuted = true;

    if (result != null) {
      findFromIndex += result.getGroup(0).length();
      return true;
    }
    return false;
  }

  public String group(int index) {
    if (!hasExecuted) {
      throw new IllegalStateException("regex not executed yet");
    } else if (result == null) {
      throw new IllegalStateException("regex did not match");
    } else {
      return result.getGroup(index);
    }
  }

  public static String quoteReplacement(String input) {
    return RegExp.quote(input);
  }

  public String replaceAll(String replacement) {
    return RegExp.compile(regExp.getSource(), "g").replace(input, replacement);
  }

  public Matcher reset() {
    result = null;
    hasExecuted = false;
    findFromIndex = 0;
    return this;
  }

  public Matcher reset(String input) {
    this.input = input;
    return reset();
  }
}