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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 2009 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;

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

/** An interface for accessing the AST root of an input. */
public interface SourceAst {
  /**
   * Gets the root node of the AST for the source file this represents. The AST
   * is lazily instantiated and cached.
   * This node is always non-null, even in the case of parse errors.
   */
  public Node getAstRoot(AbstractCompiler compiler);

  /**
   * Removes any references to root node of the AST.  If it is requested again,
   * another parse will be performed.  This method is needed to allow the ASTs
   * to be garbage collected if the inputs are still around after compilation.
   */
  public void clearAst();

  /** @return The input id associated with this AST */
  public InputId getInputId();

  /** Returns the source file the generated AST represents. */
  public SourceFile getSourceFile();
}