Review

8

com/google/javascript/jscomp/SourceMapLegacy$MappingWriter.java

appendMappingTo(Mapping, Appendable)

class SourceMapLegacy.MappingWriter {
    /**
     * Appends the mapping to the given buffer.
     */
    private void appendMappingTo(
        Mapping m, Appendable out) throws IOException {
      out.append("[");

      String sourceFile = m.sourceFile;
      // The source file rarely changes, so cache the escaped string.
      String escapedSourceFile;
      if (lastSourceFile != sourceFile) { // yes, s1 != s2, not !s1.equals(s2)
        lastSourceFile = sourceFile;
        lastSourceFileEscaped = escapeString(sourceFile);
      }
      escapedSourceFile = lastSourceFileEscaped;

      out.append(escapedSourceFile);
      out.append(",");

      int line = m.originalPosition.getLineNumber();
      if (line != lastLine) {
        lastLineString = String.valueOf(line);
      }
      String lineValue = lastLineString;

      out.append(lineValue);

      out.append(",");
      out.append(String.valueOf(
          m.originalPosition.getCharacterIndex()));

      if (m.originalName != null) {
        out.append(",");
        out.append(escapeString(m.originalName));
      }

      out.append("]\n");
    }

}