1 files changed, 64 insertions, 0 deletions
diff --git a/devtools/shared/platform/stack.js b/devtools/shared/platform/stack.js
new file mode 100644
index 0000000000..65ff644091
--- /dev/null
+++ b/devtools/shared/platform/stack.js
@@ -0,0 +1,64 @@
+/* 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/. */
+
+// A few wrappers for stack-manipulation.  This version of the module
+// is used in chrome code.
+
+"use strict";
+
+/**
+ * Return the Nth path from the stack excluding substr.
+ *
+ * @param {Number}
+ *        n the Nth path from the stack to describe.
+ * @param {String} substr
+ *        A segment of the path that should be excluded.
+ */
+function getNthPathExcluding(n, substr) {
+  let stack = Components.stack.formattedStack.split("\n");
+
+  // Remove this method from the stack
+  stack = stack.splice(1);
+
+  stack = stack.map(line => {
+    if (line.includes(" -> ")) {
+      return line.split(" -> ")[1];
+    }
+    return line;
+  });
+
+  if (substr) {
+    stack = stack.filter(line => {
+      return line && !line.includes(substr);
+    });
+  }
+
+  if (!stack[n]) {
+    n = 0;
+  }
+  return stack[n] || "";
+}
+
+/**
+ * Return a stack object that can be serialized and, when
+ * deserialized, passed to callFunctionWithAsyncStack.
+ */
+function getStack() {
+  return Components.stack.caller;
+}
+
+/**
+ * Like Cu.callFunctionWithAsyncStack but handles the isWorker case
+ * -- |Cu| isn't defined in workers.
+ */
+function callFunctionWithAsyncStack(callee, stack, id) {
+  if (isWorker) {
+    return callee();
+  }
+  return Cu.callFunctionWithAsyncStack(callee, stack, id);
+}
+
+exports.callFunctionWithAsyncStack = callFunctionWithAsyncStack;
+exports.getNthPathExcluding = getNthPathExcluding;
+exports.getStack = getStack;