added SourceMapGenerator.applySourceMap

Author: sokra

lib/source-map/source-map-generator.js

@@ -89,6 +89,77 @@ define(function (require, exports, module) {
  }
  };
 
+ /**
+ * Applies a SourceMap for a source file to the SourceMap.
+ * Each mapping to the supplied source file is rewritten using the
+ * supplied SourceMap. Note: The resolution for the resulting mappings
+ * is the minimium of this map and the supplied map.
+ */
+ SourceMapGenerator.prototype.applySourceMap =
+ function SourceMapGenerator_applySourceMap(aSourceFile, aSourceMapConsumer) {
+ // aSourceFile is an optional argument
+ if(!aSourceMapConsumer) {
+ aSourceMapConsumer = aSourceFile;
+ aSourceFile = aSourceMapConsumer.file;
+ }
+ var sourceRoot = this._sourceRoot;
+ // Applying the SourceMap can add and remove items from the sources and
+ // the names array.
+ var newSources = new ArraySet();
+ var newNames = new ArraySet();
+
+ // Find mappings for the "aSourceFile"
+ this._mappings.forEach(function (mapping) {
+ if(mapping.source === aSourceFile && mapping.original) {
+ // Check if it can be mapped by the SourceMap.
+ // Than update the mapping.
+ var original = aSourceMapConsumer.originalPositionFor({
+ line: mapping.original.line,
+ column: mapping.original.column
+ });
+ if(original && original.source !== null) {
+ // Copy mapping
+ mapping.source = original.source;
+ mapping.original.line = original.line;
+ mapping.original.column = original.column;
+ mapping.name = mapping.name && original.name || mapping.name;
+ // Try to make source file relative to our sourceRoot
+ if(sourceRoot) {
+ var relativeUrl = util.relative(sourceRoot, mapping.source);
+ if(relativeUrl) {
+ mapping.source = relativeUrl;
+ }
+ }
+ }
+ }
+
+ var source = mapping.source;
+ if (source && !newSources.has(source)) {
+ newSources.add(source);
+ }
+
+ var name = mapping.name;
+ if (name && !newNames.has(name)) {
+ newNames.add(name);
+ }
+
+ }, this);
+ this._sources = newSources;
+ this._names = newNames;
+ aSourceMapConsumer.sources.forEach(function (sourceFile) {
+ var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+ if(content) {
+ if(sourceRoot) {
+ var relativeUrl = util.relative(sourceRoot, sourceFile);
+ if(relativeUrl) {
+ sourceFile = relativeUrl;
+ }
+ }
+ generator.setSourceContent(sourceFile, content);
+ }
+ });
+ };
+
  /**
  * A mapping can have one of the three levels of data:
  *