1 files changed, 88 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/reducers/source-actors.js b/devtools/client/debugger/src/reducers/source-actors.js
new file mode 100644
index 0000000000..dde5e7e961
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+++ b/devtools/client/debugger/src/reducers/source-actors.js
@@ -0,0 +1,88 @@
+/* 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 { asyncActionAsValue } from "../actions/utils/middleware/promise";
+
+/**
+ * This reducer stores the list of all source actors.
+ * There is a one-one relationship with Source Actors from the server codebase,
+ * as well as SOURCE Resources distributed by the ResourceCommand API.
+ *
+ * See create.js: `createSourceActor` for the shape of the source actor objects.
+ * This reducer will append the following attributes:
+ * - breakableLines: { state: <"pending"|"fulfilled">, value: Array<Number> }
+ *   List of all lines where breakpoints can be set
+ */
+export const initial = new Map();
+
+export default function update(state = initial, action) {
+  switch (action.type) {
+    case "INSERT_SOURCE_ACTORS": {
+      const { items } = action;
+      // The `item` objects are defined from create.js: `createSource` method.
+      state = new Map(state);
+      for (const sourceActor of items) {
+        state.set(sourceActor.id, {
+          ...sourceActor,
+          breakableLines: null,
+        });
+      }
+      break;
+    }
+
+    case "NAVIGATE": {
+      state = initial;
+      break;
+    }
+
+    case "REMOVE_THREAD": {
+      state = new Map(state);
+      for (const sourceActor of state.values()) {
+        if (sourceActor.thread == action.threadActorID) {
+          state.delete(sourceActor.id);
+        }
+      }
+      break;
+    }
+
+    case "SET_SOURCE_ACTOR_BREAKABLE_LINES":
+      state = updateBreakableLines(state, action);
+      break;
+
+    case "CLEAR_SOURCE_ACTOR_MAP_URL":
+      state = clearSourceActorMapURL(state, action.id);
+      break;
+  }
+
+  return state;
+}
+
+function clearSourceActorMapURL(state, id) {
+  if (!state.has(id)) {
+    return state;
+  }
+
+  const newMap = new Map(state);
+  newMap.set(id, {
+    ...state.get(id),
+    sourceMapURL: "",
+  });
+  return newMap;
+}
+
+function updateBreakableLines(state, action) {
+  const value = asyncActionAsValue(action);
+  const { sourceId } = action;
+
+  if (!state.has(sourceId)) {
+    return state;
+  }
+
+  const newMap = new Map(state);
+  newMap.set(sourceId, {
+    ...state.get(sourceId),
+    breakableLines: value,
+  });
+  return newMap;
+}