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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 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 elemental2.core.JsRegExp;
import elemental2.core.JsString;

/** GWT-compatible minimal replacement for {@code Matcher} */
public class Matcher {

  private final JsRegExp regExp;
  private final JsRegExp regExpGlobal;

  private String input;

  Matcher(JsRegExp regExp, String input) {
    this.regExp = regExp;
    this.regExpGlobal = new JsRegExp(regExp.source, "g");
    this.input = input;
  }

  public boolean matches() {
    String[] result = regExp.exec(input);

    if (result != null) {
      String match = result[0];
      if (match.equals(input)) {
        return true;
      }
    }
    return false;
  }

  public boolean find() {
    return regExpGlobal.exec(input) != null;
  }

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

  public String replaceAll(String replacement) {
    return new JsString(input).replace(new JsRegExp(regExp.source, "g"), replacement).toString();
  }

  public Matcher reset() {
    regExp.lastIndex = 0;
    regExpGlobal.lastIndex = 0;
    return this;
  }

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