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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.debugging.sourcemap;


import java.io.IOException;
import java.util.List;
import org.jspecify.nullness.Nullable;

/**
 * Collects information mapping the generated (compiled) source back to
 * its original source for debugging purposes
 */
public interface SourceMapGenerator {

  /**
   * Appends the source map to the given buffer.
   *
   * @param out The stream to which the map will be appended.
   * @param name The name of the generated source file that this source map
   *   represents.
   */
  void appendTo(Appendable out, String name) throws IOException;

  /**
   * Appends the index source map to the given buffer.
   *
   * @param out The stream to which the map will be appended.
   * @param name The name of the generated source file that this source map represents.
   * @param sections An ordered list of map sections to include in the index.
   */
  void appendIndexMapTo(Appendable out, String name, List sections)
      throws IOException;

  /**
   * Resets the source map for reuse. A reset needs to be called between
   * each generated output file.
   */
  void reset();

  /**
   * Adds a mapping for the given node.  Mappings must be added in order.
   * @param sourceName The file name to use in the generate source map
   *     to represent this source.
   * @param symbolName The symbol name associated with this position in the
   *     source map.
   * @param sourceStartPosition The starting position in the original source for
   *     represented range outputStartPosition to outputEndPosition in the
   *     generated file.
   * @param outputStartPosition The position on the starting line
   * @param outputEndPosition The position on the ending line.
   */
  void addMapping(String sourceName, @Nullable String symbolName,
           FilePosition sourceStartPosition,
           FilePosition outputStartPosition, FilePosition outputEndPosition);

  /**
   * Adds a sourcesContent entry for the corresponding source.
   * @param source The source name.
   * @param content The source content.
   */
  void addSourcesContent(String source, String content);

  /**
   * Sets the prefix used for wrapping the generated source file before
   * it is written. This ensures that the source map is adjusted for the
   * change in character offsets.
   *
   * @param prefix The prefix that is added before the generated source code.
   */
  void setWrapperPrefix(String prefix);

  /**
   * Sets the source code that exists in the buffer for which the
   * generated code is being generated. This ensures that the source map
   * accurately reflects the fact that the source is being appended to
   * an existing buffer and as such, does not start at line 0, position 0
   * but rather some other line and position.
   *
   * @param offsetLine The index of the current line being printed.
   * @param offsetIndex The column index of the current character being printed.
   */
  void setStartingPosition(int offsetLine, int offsetIndex);

  /** Whether to perform additional validation on the source map. */
  void validate(boolean validate);
}