1 files changed, 147 insertions, 0 deletions
diff --git a/devtools/client/shared/components/object-inspector/reducer.js b/devtools/client/shared/components/object-inspector/reducer.js
new file mode 100644
index 0000000000..aa8af2b529
--- /dev/null
+++ b/devtools/client/shared/components/object-inspector/reducer.js
@@ -0,0 +1,147 @@
+/* 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/>. */
+
+function initialOIState(overrides) {
+  return {
+    expandedPaths: new Set(),
+    loadedProperties: new Map(),
+    evaluations: new Map(),
+    watchpoints: new Map(),
+    ...overrides,
+  };
+}
+
+function reducer(state = initialOIState(), action = {}) {
+  const { type, data } = action;
+
+  const cloneState = overrides => ({ ...state, ...overrides });
+
+  if (type === "NODE_EXPAND") {
+    return cloneState({
+      expandedPaths: new Set(state.expandedPaths).add(data.node.path),
+    });
+  }
+
+  if (type === "NODE_COLLAPSE") {
+    const expandedPaths = new Set(state.expandedPaths);
+    expandedPaths.delete(data.node.path);
+    return cloneState({ expandedPaths });
+  }
+
+  if (type == "SET_WATCHPOINT") {
+    const { watchpoint, property, path } = data;
+    const obj = state.loadedProperties.get(path);
+
+    return cloneState({
+      loadedProperties: new Map(state.loadedProperties).set(
+        path,
+        updateObject(obj, property, watchpoint)
+      ),
+      watchpoints: new Map(state.watchpoints).set(data.actor, data.watchpoint),
+    });
+  }
+
+  if (type === "REMOVE_WATCHPOINT") {
+    const { path, property, actor } = data;
+    const obj = state.loadedProperties.get(path);
+    const watchpoints = new Map(state.watchpoints);
+    watchpoints.delete(actor);
+
+    return cloneState({
+      loadedProperties: new Map(state.loadedProperties).set(
+        path,
+        updateObject(obj, property, null)
+      ),
+      watchpoints: watchpoints,
+    });
+  }
+
+  if (type === "NODE_PROPERTIES_LOADED") {
+    return cloneState({
+      loadedProperties: new Map(state.loadedProperties).set(
+        data.node.path,
+        action.data.properties
+      ),
+    });
+  }
+
+  if (type === "ROOTS_CHANGED") {
+    return cloneState();
+  }
+
+  if (type === "GETTER_INVOKED") {
+    return cloneState({
+      evaluations: new Map(state.evaluations).set(data.node.path, {
+        getterValue:
+          data.result &&
+          data.result.value &&
+          (data.result.value.throw || data.result.value.return),
+      }),
+    });
+  }
+
+  // NOTE: we clear the state on resume because otherwise the scopes pane
+  // would be out of date. Bug 1514760
+  if (type === "RESUME" || type == "NAVIGATE") {
+    return initialOIState({ watchpoints: state.watchpoints });
+  }
+
+  return state;
+}
+
+function updateObject(obj, property, watchpoint) {
+  return {
+    ...obj,
+    ownProperties: {
+      ...obj.ownProperties,
+      [property]: {
+        ...obj.ownProperties[property],
+        watchpoint,
+      },
+    },
+  };
+}
+
+function getObjectInspectorState(state) {
+  return state.objectInspector || state;
+}
+
+function getExpandedPaths(state) {
+  return getObjectInspectorState(state).expandedPaths;
+}
+
+function getExpandedPathKeys(state) {
+  return [...getExpandedPaths(state).keys()];
+}
+
+function getWatchpoints(state) {
+  return getObjectInspectorState(state).watchpoints;
+}
+
+function getLoadedProperties(state) {
+  return getObjectInspectorState(state).loadedProperties;
+}
+
+function getLoadedPropertyKeys(state) {
+  return [...getLoadedProperties(state).keys()];
+}
+
+function getEvaluations(state) {
+  return getObjectInspectorState(state).evaluations;
+}
+
+const selectors = {
+  getWatchpoints,
+  getEvaluations,
+  getExpandedPathKeys,
+  getExpandedPaths,
+  getLoadedProperties,
+  getLoadedPropertyKeys,
+};
+
+Object.defineProperty(module.exports, "__esModule", {
+  value: true,
+});
+module.exports = { ...selectors, initialOIState };
+module.exports.default = reducer;