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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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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 static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.VisibleForTesting;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.StaticSourceFile.SourceKind;

/**
 * An AST generated totally by the compiler.
 *
 * @author [email protected] (Nick Santos)
 */
public final class SyntheticAst implements SourceAst {
  private static final long serialVersionUID = 1L;

  private final InputId inputId;
  private final SourceFile sourceFile;

  private Node root;

  @VisibleForTesting
  public static SyntheticAst emptyWithFileName(String sourceName) {
    return new SyntheticAst(sourceName);
  }

  SyntheticAst(String sourceName) {
    this.inputId = new InputId(sourceName);
    this.sourceFile = new SourceFile(sourceName, SourceKind.STRONG);
    clearAst();
  }

  public SyntheticAst(Node root) {
    this.inputId = new InputId(root.getSourceFileName());
    this.sourceFile = new SourceFile(root.getSourceFileName(), SourceKind.STRONG);
    this.root = checkNotNull(root);
  }

  @Override
  public Node getAstRoot(AbstractCompiler compiler) {
    return root;
  }

  @Override
  public void clearAst() {
    root = IR.script();
    root.setInputId(inputId);
    root.setStaticSourceFile(sourceFile);
  }

  @Override
  public InputId getInputId() {
    return inputId;
  }

  @Override
  public SourceFile getSourceFile() {
    return sourceFile;
  }

  @Override
  public void setSourceFile(SourceFile file) {
    throw new IllegalStateException(
        "Cannot set a source file for a synthetic AST");
  }
}