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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 2007 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.type;

import com.google.javascript.rhino.Node;

/**
 * This interface defines what reversed abstract interpreters provide.
 * Abstract interpretation is the process of interpreting a program at an
 * abstracted level (such as at the type level) instead of the concrete level
 * (the flow of values). This reversed abstract interpreter reverses the
 * abstract interpretation process by knowing the outcome of some computation
 * and calculating a preciser view of the world than the view without knowing
 * the outcome of the computation.
 *
 */
public interface ReverseAbstractInterpreter {
  /**
   * Calculates a precise version of the scope knowing the outcome of the
   * condition.
   *
   *  @param condition the condition's expression
   *  @param blindScope the scope without knowledge about the outcome of the
   *  condition
   *  @param outcome the outcome of the condition
   */
  FlowScope getPreciserScopeKnowingConditionOutcome(Node condition,
      FlowScope blindScope, boolean outcome);
}