1 files changed, 23 insertions, 1 deletions
diff --git a/Source/WebCore/inspector/front-end/ScriptFormatterWorker.js b/Source/WebCore/inspector/front-end/ScriptFormatterWorker.js
index e900317..1a4c28e 100644
--- a/Source/WebCore/inspector/front-end/ScriptFormatterWorker.js
+++ b/Source/WebCore/inspector/front-end/ScriptFormatterWorker.js
@@ -32,7 +32,10 @@ var parse = loadModule("parse-js.js");
 var process = loadModule("process.js");
 
 onmessage = function(event) {
-    postMessage(beautify(event.data));
+    var source = event.data;
+    var formattedSource = beautify(source);
+    var mapping = buildMapping(source, formattedSource);
+    postMessage({ formattedSource: formattedSource, mapping: mapping });
 };
 
 function beautify(source)
@@ -47,6 +50,25 @@ function beautify(source)
     return process.gen_code(ast, beautifyOptions);
 }
 
+function buildMapping(source, formattedSource)
+{
+    var mapping = { original: [], formatted: [] };
+    var lastCodePosition = 0;
+    var regexp = /[\$\.\w]+|{|}/g;
+    while (true) {
+        var match = regexp.exec(formattedSource);
+        if (!match)
+            break;
+        var position = source.indexOf(match[0], lastCodePosition);
+        if (position === -1)
+            continue;
+        mapping.original.push(position);
+        mapping.formatted.push(match.index);
+        lastCodePosition = position + match[0].length;
+    }
+    return mapping;
+}
+
 function loadModule(src)
 {
     var request = new XMLHttpRequest();