1 files changed, 55 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/pause/scopes/utils.js b/devtools/client/debugger/src/utils/pause/scopes/utils.js
new file mode 100644
index 0000000000..16ebbf04a9
--- /dev/null
+++ b/devtools/client/debugger/src/utils/pause/scopes/utils.js
@@ -0,0 +1,55 @@
+/* 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/>. */
+
+export function getFramePopVariables(why, path) {
+  const vars = [];
+
+  if (why && why.frameFinished) {
+    const { frameFinished } = why;
+
+    // Always display a `throw` property if present, even if it is falsy.
+    if (Object.prototype.hasOwnProperty.call(frameFinished, "throw")) {
+      vars.push({
+        name: "<exception>",
+        path: `${path}/<exception>`,
+        contents: { value: frameFinished.throw },
+      });
+    }
+
+    if (Object.prototype.hasOwnProperty.call(frameFinished, "return")) {
+      const returned = frameFinished.return;
+
+      // Do not display undefined. Do display falsy values like 0 and false. The
+      // protocol grip for undefined is a JSON object: { type: "undefined" }.
+      if (typeof returned !== "object" || returned.type !== "undefined") {
+        vars.push({
+          name: "<return>",
+          path: `${path}/<return>`,
+          contents: { value: returned },
+        });
+      }
+    }
+  }
+
+  return vars;
+}
+
+export function getThisVariable(this_, path) {
+  if (!this_) {
+    return null;
+  }
+
+  return {
+    name: "<this>",
+    path: `${path}/<this>`,
+    contents: { value: this_ },
+  };
+}
+
+// Get a string path for an scope item which can be used in different pauses for
+// a thread.
+export function getScopeItemPath(item) {
+  // Calling toString() on item.path allows symbols to be handled.
+  return item.path.toString();
+}