1 files changed, 62 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/reducers/ast.js b/devtools/client/debugger/src/reducers/ast.js
new file mode 100644
index 0000000000..b1e3e21ecf
--- /dev/null
+++ b/devtools/client/debugger/src/reducers/ast.js
@@ -0,0 +1,62 @@
+/* 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/>. */
+
+/**
+ * Ast reducer
+ * @module reducers/ast
+ */
+
+import { makeBreakpointId } from "../utils/breakpoint";
+
+export function initialASTState() {
+  return {
+    // Internal map of the source id to the specific source actor
+    // that loads the text for these symbols.
+    actors: {},
+    symbols: {},
+    inScopeLines: {},
+  };
+}
+
+function update(state = initialASTState(), action) {
+  switch (action.type) {
+    case "SET_SYMBOLS": {
+      const { sourceId, sourceActorId } = action;
+      if (action.status === "start") {
+        return state;
+      }
+
+      const value = action.value;
+      return {
+        ...state,
+        actors: { ...state.actors, [sourceId]: sourceActorId },
+        symbols: { ...state.symbols, [sourceId]: value },
+      };
+    }
+
+    case "IN_SCOPE_LINES": {
+      return {
+        ...state,
+        inScopeLines: {
+          ...state.inScopeLines,
+          [makeBreakpointId(action.location)]: action.lines,
+        },
+      };
+    }
+
+    case "RESUME": {
+      return { ...state, inScopeLines: {} };
+    }
+
+    case "NAVIGATE": {
+      return initialASTState();
+    }
+
+    default: {
+      return state;
+    }
+  }
+}
+
+export default update;