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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 2014 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.refactoring;

import com.google.common.collect.ImmutableList;
import com.google.javascript.rhino.Node;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

/**
 * Class that developers should implement to perform a JsFlume refactoring.
 */
public abstract class Scanner implements Serializable {

  /**
   * Returns true if the given node and node traversal should match for this
   * particular scanner. Typically this function uses the {@link Matcher} class
   * or predefined matchers from {@link Matchers} to match against the Node and
   * NodeMetadata.
   *
   * If this function returns true, a {@link Match} for this node will be passed
   * to {@link #processMatch(Match)} and all matches will be passed to
   * {@link #processAllMatches(Collection)} at the end of the traversal.
   */
  public abstract boolean matches(Node node, NodeMetadata t);

  /**
   * Processes one {@link Match} at a time. There is no order guaranteed for
   * when this function will be called with the Match.
   * @param match The {@link Match} from the node and traversal for any match
   *     that {@link #matches} returned true for.
   * @return List of {@link SuggestedFix} classes that will be applied to the
   *     source files at the end of the run to create the refactoring CL.
   */
  public List processMatch(Match match) {
    return ImmutableList.of();
  }

  /**
   * Processes every given match at one time. This function can be used when
   * the refactoring needs the information from the entire run to perform the
   * refactoring, such as moving functions around.
   * @param matches All the {@link Match} matches that were collected when the
   *     {@link #matches} function returned true.
   * @return List of {@link SuggestedFix} classes that will be applied to the
   *     source files at the end of the run to create the refactoring CL.
   */
  public List processAllMatches(Collection matches) {
    return ImmutableList.of();
  }
}