Package com.google.debugging.sourcemap

Class SourceMapGeneratorV2

java.lang.Object
com.google.debugging.sourcemap.SourceMapGeneratorV2
All Implemented Interfaces:
SourceMapGenerator
public class SourceMapGeneratorV2 extends Object implements SourceMapGenerator
Collects information mapping the generated (compiled) source back to its original source for debugging purposes.

  • Constructor Details

    • SourceMapGeneratorV2

      public SourceMapGeneratorV2()

  • Method Details

    • reset

      public void reset()
      Resets the source map for reuse. A reset needs to be called between each generated output file.
      Specified by:
      reset in interface SourceMapGenerator

    • validate

      public void validate(boolean validate)
      Description copied from interface: SourceMapGenerator
      Whether to perform additional validation on the source map.
      Specified by:
      validate in interface SourceMapGenerator
      Parameters:
      validate - Whether to perform (potentially costly) validation on the generated source map.

    • setWrapperPrefix

      public void setWrapperPrefix(String prefix)
      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.
      Specified by:
      setWrapperPrefix in interface SourceMapGenerator
      Parameters:
      prefix - The prefix that is added before the generated source code.

    • setStartingPosition

      public void setStartingPosition(int offsetLine, int offsetIndex)
      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.
      Specified by:
      setStartingPosition in interface SourceMapGenerator
      Parameters:
      offsetLine - The index of the current line being printed.
      offsetIndex - The column index of the current character being printed.

    • addMapping

      public void addMapping(String sourceName, @Nullable String symbolName, FilePosition sourceStartPosition, FilePosition startPosition, FilePosition endPosition)
      Adds a mapping for the given node. Mappings must be added in order.
      Specified by:
      addMapping in interface SourceMapGenerator
      Parameters:
      startPosition - The position on the starting line
      endPosition - The position on the ending line.
      sourceName - The file name to use in the generate source map to represent this source.
      symbolName - The symbol name associated with this position in the source map.
      sourceStartPosition - The starting position in the original source for represented range outputStartPosition to outputEndPosition in the generated file.

    • appendTo

      public void appendTo(Appendable out, String name) throws IOException
      Writes out the source map in the following format (line numbers are for reference only and are not part of the format): 1. { 2. version: 2, 3. file: "out.js" 4. lineCount: 2 5. lineMaps: [ 6. "ABAAA", 7. "ABAA" 8. ], 9. sourceRoot: "", 10. sources: ["foo.js", "bar.js"], 11. names: ["src", "maps", "are", "fun"], 12. mappings: [ 13. [1, 1, 2, 4], 14. [2, 1, 2, "yack"], 15. ], 16. } Line 1: The entire file is a single JSON object Line 2: File revision (always the first entry in the object) Line 3: The name of the file that this source map is associated with. Line 4: The number of lines represented in the source map. Line 5: "lineMaps" field is a JSON array, where each entry represents a line in the generated text. Line 6: A line entry, representing a series of line segments, where each segment encodes an mappings-id and repetition count. Line 9: An optional source root, useful for relocating source files on a server or removing repeated prefix values in the "sources" entry. Line 10: A list of sources used by the "mappings" entry relative to the sourceRoot. Line 11: A list of symbol names used by the "mapping" entry. This list may be incomplete. Line 12: The mappings field. Line 13: Each entry represent a block of text in the original source, and consists four fields: The source file name The line in the source file the text begins The column in the line that the text begins An optional name (from the original source) that this entry represents. This can either be an string or index into the "names" field.
      Specified by:
      appendTo in interface SourceMapGenerator
      Parameters:
      out - The stream to which the map will be appended.
      name - The name of the generated source file that this source map represents.
      Throws:
      IOException

    • appendIndexMapTo

      public void appendIndexMapTo(Appendable out, String name, List<SourceMapSection> appSections)
      Description copied from interface: SourceMapGenerator
      Appends the index source map to the given buffer.
      Specified by:
      appendIndexMapTo in interface SourceMapGenerator
      Parameters:
      out - The stream to which the map will be appended.
      name - The name of the generated source file that this source map represents.
      appSections - An ordered list of map sections to include in the index.