com.google.javascript.jscomp.fuzzing.WhileFuzzer.java Source code

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Here is the source code for com.google.javascript.jscomp.fuzzing.WhileFuzzer.java

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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.common.collect.Sets;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;

import java.util.EnumSet;
import java.util.Set;

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

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

    /* (non-Javadoc)
     * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#isEnough(int)
     */
    @Override
    protected boolean isEnough(int budget) {
        return budget >= 3;
    }

    /* (non-Javadoc)
     * @see com.google.javascript.jscomp.fuzzing.AbstractFuzzer#generate(int)
     */
    @Override
    protected Node generate(int budget, Set<Type> types) {
        AbstractFuzzer[] fuzzers = { new ExpressionFuzzer(context), new BlockFuzzer(context) };
        Scope scope = context.scopeManager.localScope();
        scope.loopNesting++;
        Node[] components = distribute(budget - 1, fuzzers);
        scope.loopNesting--;
        return new Node(Token.WHILE, components);
    }

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

    @Override
    protected Node fuzz(AbstractFuzzer fuzzer, int budget) {
        if (fuzzer instanceof ExpressionFuzzer) {
            /*
             * someLabel: while(void(xxx)) {} often causes compiler to crash when
             * compiling from AST. Because while(undefined) {} only produce dead code,
             * we could safely remove it.
             */
            Set<Type> types = Sets
                    .immutableEnumSet(Sets.difference(fuzzer.supportedTypes(), EnumSet.of(Type.UNDEFINED)));
            return fuzzer.generate(budget, types);
        } else {
            return fuzzer.generate(budget);
        }
    }
}