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.

SourceMapGeneratorV2

public SourceMapGeneratorV2()

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 sourcemap. 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

writeMetaMap

public void writeMetaMap(Appendable out,
                         String name,
                         List<SourceMapSection> appSections)
                  throws IOException

To facilitate incremental compiles, create a source map that is built piecemeal from other source maps.

Specified by:

writeMetaMap in interface SourceMapGenerator

Throws:

IOException

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