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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.javascript.jscomp.AbstractCompiler;
import com.google.javascript.jscomp.TemplateAstMatcher;
import com.google.javascript.jscomp.TypeMatchingStrategy;
import com.google.javascript.rhino.Node;
import java.util.Map;

/**
 * A {@link Matcher} that can take arbitrary JS source code and use it as a
 * template to find matches in other source code.
 */
public final class JsSourceMatcher implements Matcher {

  private final TemplateAstMatcher matcher;

  /**
   * Constructs this matcher with a Function node that serves as the template to match all other
   * nodes against. The body of the function will be used to match against.
   */
  public JsSourceMatcher(
      AbstractCompiler compiler, Node templateNode, TypeMatchingStrategy typeMatchingStrategy) {
    matcher = new TemplateAstMatcher(compiler, templateNode, typeMatchingStrategy);
  }

  @Override public boolean matches(Node n, NodeMetadata metadata) {
    return matcher.matches(n);
  }

  /**
   * Returns a map from named template node strings to Nodes that were the
   * equivalent matches from the last matched template.
   */
  public Map getTemplateNodeToMatchMap() {
    return matcher.getTemplateNodeToMatchMap();
  }
}