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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 2018 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.checkState;

import com.google.javascript.rhino.Node;
import javax.annotation.Nullable;

/**
 * An abstract WarningsGuard that provides an additional getScriptNodeForError() method
 * for accessing the containing SCRIPT node of the AST in a robust way.
 */
public abstract class FileAwareWarningsGuard extends WarningsGuard {

  private final AbstractCompiler compiler;

  protected FileAwareWarningsGuard(AbstractCompiler compiler) {
    this.compiler = compiler;
  }

  @Nullable
  protected final Node getScriptNodeForError(JSError error) {
    // If error.node is connected to AST, this will be much faster than compiler.getScriptNode
    for (Node n = error.getNode(); n != null; n = n.getParent()) {
      if (n.isScript()) {
        return n;
      }
    }
    if (error.getSourceName() == null) {
      return null;
    }
    Node scriptNode = compiler.getScriptNode(error.getSourceName());
    if (scriptNode != null) {
      // TODO(b/73088845): This should always be a SCRIPT node
      if (!scriptNode.isScript()) {
        return null;
      }
      checkState(scriptNode.isScript(), scriptNode);
      return scriptNode;
    }
    return null;
  }
}