1 files changed, 92 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..9796815727
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+++ b/devtools/client/debugger/src/reducers/ast.js
@@ -0,0 +1,92 @@
+/* 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 {
+    // We are using mutable objects as we never return the dictionary as-is from the selectors
+    // but only their values.
+    // Note that all these dictionaries are storing objects as values
+    // which all will have a threadActorId attribute.
+
+    // We have two maps, a first one for original sources.
+    // This is keyed by source id.
+    mutableOriginalSourcesSymbols: {},
+
+    // And another one, for generated sources.
+    // This is keyed by source actor id.
+    mutableSourceActorSymbols: {},
+
+    mutableInScopeLines: {},
+  };
+}
+
+function update(state = initialASTState(), action) {
+  switch (action.type) {
+    case "SET_SYMBOLS": {
+      const { location } = action;
+      if (action.status === "start") {
+        return state;
+      }
+
+      const entry = {
+        value: action.value,
+        threadActorId: location.sourceActor?.thread,
+      };
+      if (location.source.isOriginal) {
+        state.mutableOriginalSourcesSymbols[location.source.id] = entry;
+      } else {
+        if (!location.sourceActor) {
+          throw new Error(
+            "Expects a location with a source actor when adding symbols for non-original sources"
+          );
+        }
+        state.mutableSourceActorSymbols[location.sourceActor.id] = entry;
+      }
+      return {
+        ...state,
+      };
+    }
+
+    case "IN_SCOPE_LINES": {
+      state.mutableInScopeLines[makeBreakpointId(action.location)] = {
+        lines: action.lines,
+        threadActorId: action.location.sourceActor?.thread,
+      };
+      return {
+        ...state,
+      };
+    }
+
+    case "RESUME": {
+      return { ...state, mutableInScopeLines: {} };
+    }
+
+    case "REMOVE_THREAD": {
+      function clearDict(dict, threadId) {
+        for (const key in dict) {
+          if (dict[key].threadActorId == threadId) {
+            delete dict[key];
+          }
+        }
+      }
+      clearDict(state.mutableSourceActorSymbols, action.threadActorID);
+      clearDict(state.mutableOriginalSourcesSymbols, action.threadActorID);
+      clearDict(state.mutableInScopeLines, action.threadActorID);
+      return { ...state };
+    }
+
+    default: {
+      return state;
+    }
+  }
+}
+
+export default update;