1 files changed, 73 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/actions/sources/breakableLines.js b/devtools/client/debugger/src/actions/sources/breakableLines.js
new file mode 100644
index 0000000000..d028d480c0
--- /dev/null
+++ b/devtools/client/debugger/src/actions/sources/breakableLines.js
@@ -0,0 +1,73 @@
+/* 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/>. */
+
+import { isOriginalId } from "devtools/client/shared/source-map-loader/index";
+import {
+  getBreakableLines,
+  getSourceActorBreakableLines,
+} from "../../selectors";
+import { setBreakpointPositions } from "../breakpoints/breakpointPositions";
+
+function calculateBreakableLines(positions) {
+  const lines = [];
+  for (const line in positions) {
+    if (positions[line].length) {
+      lines.push(Number(line));
+    }
+  }
+
+  return lines;
+}
+
+/**
+ * Ensure that breakable lines for a given source are fetched.
+ *
+ * @param Object cx
+ * @param Object location
+ */
+export function setBreakableLines(cx, location) {
+  return async ({ getState, dispatch, client }) => {
+    let breakableLines;
+    if (isOriginalId(location.source.id)) {
+      const positions = await dispatch(
+        setBreakpointPositions({ cx, location })
+      );
+      breakableLines = calculateBreakableLines(positions);
+
+      const existingBreakableLines = getBreakableLines(
+        getState(),
+        location.source.id
+      );
+      if (existingBreakableLines) {
+        breakableLines = [
+          ...new Set([...existingBreakableLines, ...breakableLines]),
+        ];
+      }
+
+      dispatch({
+        type: "SET_ORIGINAL_BREAKABLE_LINES",
+        cx,
+        sourceId: location.source.id,
+        breakableLines,
+      });
+    } else {
+      // Ignore re-fetching the breakable lines for source actor we already fetched
+      breakableLines = getSourceActorBreakableLines(
+        getState(),
+        location.sourceActor.id
+      );
+      if (breakableLines) {
+        return;
+      }
+      breakableLines = await client.getSourceActorBreakableLines(
+        location.sourceActor
+      );
+      dispatch({
+        type: "SET_SOURCE_ACTOR_BREAKABLE_LINES",
+        sourceActorId: location.sourceActor.id,
+        breakableLines,
+      });
+    }
+  };
+}