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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 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;

import com.google.debugging.sourcemap.proto.Mapping.OriginalMapping;

/**
 * A source excerpt provider is responsible for building source code excerpt
 * of specific locations, such as a specific line or a region around a
 * given line number.
 */
public interface SourceExcerptProvider {
  /**
   * Source excerpt variety.
   */
  enum SourceExcerpt {
    /**
     * Line excerpt.
     */
    LINE {
      @Override
      public String get(SourceExcerptProvider source, String sourceName,
          int lineNumber, ExcerptFormatter formatter) {
        return formatter.formatLine(
            source.getSourceLine(sourceName, lineNumber), lineNumber);
      }
    },
    /**
     * Region excerpt.
     */
    REGION {
      @Override
      public String get(SourceExcerptProvider source, String sourceName,
          int lineNumber, ExcerptFormatter formatter) {
        return formatter.formatRegion(
            source.getSourceRegion(sourceName, lineNumber));
      }
    };

    /**
     * Get a source excerpt string based on the type of the source excerpt.
     */
    public abstract String get(SourceExcerptProvider source, String sourceName,
        int lineNumber, ExcerptFormatter formatter);
  }

  /**
   * Get the line indicated by the line number. This call will return only the
   * specific line.
   *
   * @param lineNumber the line number, 1 being the first line of the file
   * @return the line indicated, or {@code null} if it does not exist
   */
  String getSourceLine(String sourceName, int lineNumber);

  /**
   * Get a region around the indicated line number. The exact definition of a
   * region is implementation specific, but it must contain the line indicated
   * by the line number. A region must not start or end by a carriage return.
   *
   * @param lineNumber the line number, 1 being the first line of the file
   * @return the region around the line number indicated, or {@code null}
   * if it does not exist
   */
  Region getSourceRegion(String sourceName, int lineNumber);

  /**
   * If the source file is associated with an inputSourceMap, does a lookup
   * for the original file position based on this source map.
   */
  OriginalMapping getSourceMapping(String sourceName, int lineNumber, int columnNumber);

  /**
   * A excerpt formatter is responsible of formatting source excerpts.
   */
  interface ExcerptFormatter {
    /**
     * Format a line excerpt.
     */
    String formatLine(String line, int lineNumber);

    /**
     * Format a region excerpt.
     */
    String formatRegion(Region region);
  }
}