1 files changed, 123 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.7/packages/api-utils/lib/traceback.js b/tools/addon-sdk-1.7/packages/api-utils/lib/traceback.js
new file mode 100644
index 0000000..c55fd9d
--- /dev/null
+++ b/tools/addon-sdk-1.7/packages/api-utils/lib/traceback.js
@@ -0,0 +1,123 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {Cc,Ci,components} = require("chrome");
+
+// Undo the auto-parentification of URLs done in bug 418356.
+function deParentifyURL(url) {
+  return url ? url.split(" -> ").slice(-1)[0] : url;
+}
+
+// TODO: We might want to move this function to url or some similar
+// module.
+function getLocalFile(path) {
+  var ios = Cc['@mozilla.org/network/io-service;1']
+            .getService(Ci.nsIIOService);
+  var channel = ios.newChannel(path, null, null);
+  var iStream = channel.open();
+  var siStream = Cc['@mozilla.org/scriptableinputstream;1']
+                 .createInstance(Ci.nsIScriptableInputStream);
+  siStream.init(iStream);
+  var data = new String();
+  data += siStream.read(-1);
+  siStream.close();
+  iStream.close();
+  return data;
+}
+
+function safeGetFileLine(path, line) {
+  try {
+    var scheme = require("./url").URL(path).scheme;
+    // TODO: There should be an easier, more accurate way to figure out
+    // what's the case here.
+    if (!(scheme == "http" || scheme == "https"))
+      return getLocalFile(path).split("\n")[line - 1];
+  } catch (e) {}
+  return null;
+}
+
+function errorStackToJSON(stack) {
+  var lines = stack.split("\n");
+
+  var frames = [];
+  lines.forEach(
+    function(line) {
+      if (!line)
+        return;
+      var atIndex = line.indexOf("@");
+      var colonIndex = line.lastIndexOf(":");
+      var filename = deParentifyURL(line.slice(atIndex + 1, colonIndex));
+      var lineNo = parseInt(line.slice(colonIndex + 1));
+      var funcSig = line.slice(0, atIndex);
+      var funcName = funcSig.slice(0, funcSig.indexOf("("));
+      frames.unshift({filename: filename,
+                      funcName: funcName,
+                      lineNo: lineNo});
+    });
+
+  return frames;
+};
+
+function nsIStackFramesToJSON(frame) {
+  var stack = [];
+
+  while (frame) {
+    if (frame.filename) {
+      var filename = deParentifyURL(frame.filename);
+      stack.splice(0, 0, {filename: filename,
+                          lineNo: frame.lineNumber,
+                          funcName: frame.name});
+    }
+    frame = frame.caller;
+  }
+
+  return stack;
+};
+
+var fromException = exports.fromException = function fromException(e) {
+  if (e instanceof Ci.nsIException)
+    return nsIStackFramesToJSON(e.location);
+  if (e.stack && e.stack.length)
+    return errorStackToJSON(e.stack);
+  if (e.fileName && typeof(e.lineNumber == "number"))
+    return [{filename: deParentifyURL(e.fileName),
+             lineNo: e.lineNumber,
+             funcName: null}];
+  return [];
+};
+
+var get = exports.get = function get() {
+  return nsIStackFramesToJSON(components.stack.caller);
+};
+
+var format = exports.format = function format(tbOrException) {
+  if (tbOrException === undefined) {
+    tbOrException = get();
+    tbOrException.splice(-1, 1);
+  }
+
+  var tb;
+  if (typeof(tbOrException) == "object" &&
+      tbOrException.constructor.name == "Array")
+    tb = tbOrException;
+  else
+    tb = fromException(tbOrException);
+
+  var lines = ["Traceback (most recent call last):"];
+
+  tb.forEach(
+    function(frame) {
+      if (!(frame.filename || frame.lineNo || frame.funcName))
+	return;
+      lines.push('  File "' + frame.filename + '", line ' +
+                 frame.lineNo + ', in ' + frame.funcName);
+      var sourceLine = safeGetFileLine(frame.filename, frame.lineNo);
+      if (sourceLine)
+        lines.push('    ' + sourceLine.trim());
+    });
+
+  return lines.join("\n");
+};