Examples with SourceMapGenerator org.eclipse.n4js.transpiler.sourcemap.SourceMapGenerator used on opensource projects

Example 1 with SourceMapGenerator

use of org.eclipse.n4js.transpiler.sourcemap.SourceMapGenerator in project n4js by eclipse.

the class PrettyPrinter method print.

/**
 * Serialize the intermediate model in the given transpiler state to <code>outCode</code> and emit source maps to
 * <code>optSourceMapData</code>.
 *
 * @param optPreamble
 *            an optional preamble that will be prepended to the output code. Use '\n' as line separator. If absent,
 *            no preamble will be prepended.<br>
 *            If present, a single line break will be used to separate the preamble from the main output, but
 *            additional line feed characters may be added at the end of the preamble string if empty lines are
 *            desired between preamble and main output.
 */
public void print(TranspilerState state, Writer outCode, Optional<String> optPreamble, Optional<SourceMapInfo> optSourceMapInfo) throws IOException {
    final boolean emitSourceMaps = optSourceMapInfo.isPresent();
    final SourceMapAwareAppendable out = new SourceMapAwareAppendable(outCode, INDENT, emitSourceMaps);
    if (optPreamble.isPresent()) {
        // #append(CharSequence) will convert '\n' to correct line separator
        out.append(optPreamble.get());
        out.newLine();
    }
    PrettyPrinterSwitch.append(out, state);
    if (emitSourceMaps) {
        final SourceMapInfo sourceMapInfo = optSourceMapInfo.get();
        final SourceMapGenerator generator = new SourceMapGeneratorDummy();
        // append link to source maps to outCode
        out.newLine();
        out.append("//# sourceMappingURL=" + sourceMapInfo.simpleSourceMapFileName);
        out.newLine();
        // get the mappings collected by SourceMapAwareAppendable
        final List<SourceOutputMapping> mappings = new ArrayList<>(out.getSourceMapData());
        // perform some tweaks on the mappings (TEMPORARY)
        removeCatchAllMapping(mappings);
        sortMappings(mappings);
        // Convert the source/output mappings produced by SourceMapAwareAppendable to the API of the
        // Google Closure compiler source map library and add them to our SourceMapGenerator 'generator'
        final PositionProvider positionProvider = PositionProvider.from(state.resource);
        for (SourceOutputMapping m : mappings) {
            final EObject originalASTNode = state.tracer.getOriginalASTNode(m.elementInIM);
            if (// it's ok if this is null
            originalASTNode != null && originalASTNode.eResource() instanceof N4JSResource) {
                final ITextRegion region = locationInFileProvider.getSignificantTextRegion(originalASTNode);
                // get the resource and compute the path.
                final String path = sourceMapInfo.resolve((N4JSResource) originalASTNode.eResource());
                final FilePosition sourceStartPosition = positionProvider.toPosition(region.getOffset());
                generator.addMapping(path, // TODO source maps: support for original symbol name
                null, sourceStartPosition, m.outputStart, m.outputEnd);
            }
        }
        // append actual source maps to the buffer passed in via 'sourceMapInfo'
        generator.appendTo(sourceMapInfo.sourceMapBuff, sourceMapInfo.simpleCompiledFileName);
    }
}