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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 2013 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.fuzzing;

import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;

import java.util.Set;

/**
 * UNDER DEVELOPMENT. DO NOT USE!
 */
class ForFuzzer extends AbstractFuzzer {

  ForFuzzer(FuzzingContext context) {
    super(context);
  }

  /* (non-Javadoc)
   * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#isEnough(int)
   */
  @Override
  protected boolean isEnough(int budget) {
    return budget >= 2;
  }

  /* (non-Javadoc)
   * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#generate(int)
   */
  @Override
  protected Node generate(int budget, Set types) {
    int totalHeaderBudget =
        (int) ((budget - 1) * getOwnConfig().optDouble("headBudget"));
    int bodyBudget = budget - 1 - totalHeaderBudget;
    ExpressionFuzzer exprFuzzer =
        new ExpressionFuzzer(context);
    AbstractFuzzer[] fuzzers = {
        new ForInitializerFuzzer(context),
        exprFuzzer, exprFuzzer};

    Node[] headers = distribute(totalHeaderBudget, fuzzers);
    Node node = new Node(Token.FOR, headers);
    context.scopeManager.localScope().loopNesting++;
    Node body = new BlockFuzzer(context).
        generate(bodyBudget);
    context.scopeManager.localScope().loopNesting--;
    node.addChildToBack(body);
    return node;
  }

  @Override
  protected Node fuzz(AbstractFuzzer fuzzer, int budget) {
    if (fuzzer.isEnough(budget)) {
      return fuzzer.generate(budget);
    } else {
      return new Node(Token.EMPTY);
    }
  }

  private static class ForInitializerFuzzer extends Dispatcher {

    ForInitializerFuzzer(FuzzingContext context) {
      super(context);
    }

    /* (non-Javadoc)
     * @see com.google.javascript.jscomp.fuzzing.Dispatcher#initCandidates()
     */
    @Override
    protected void initCandidates() {
      candidates = new AbstractFuzzer[] {
        new VarFuzzer(context),
        new ExpressionFuzzer(context)
      };
    }

    /* (non-Javadoc)
     * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#getConfigName()
     */
    @Override
    protected String getConfigName() {
      return "forInitializer";
    }

  }

  /* (non-Javadoc)
   * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#getConfigName()
   */
  @Override
  protected String getConfigName() {
    return "for";
  }
}