From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 devtools/client/memory/reducers/view.js | 49 +++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 devtools/client/memory/reducers/view.js

(limited to 'devtools/client/memory/reducers/view.js')

diff --git a/devtools/client/memory/reducers/view.js b/devtools/client/memory/reducers/view.js
new file mode 100644
index 000000000..5d31e0c9b
--- /dev/null
+++ b/devtools/client/memory/reducers/view.js
@@ -0,0 +1,49 @@
+/* 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/. */
+"use strict";
+
+const { assert } = require("devtools/shared/DevToolsUtils");
+const { actions, viewState } = require("../constants");
+
+const handlers = Object.create(null);
+
+handlers[actions.POP_VIEW] = function (view, _) {
+  assert(view.previous, "Had better have a previous view state when POP_VIEW");
+  return Object.freeze({
+    state: view.previous.state,
+    previous: null,
+  });
+};
+
+handlers[actions.CHANGE_VIEW] = function (view, action) {
+  const { newViewState, oldDiffing, oldSelected } = action;
+  assert(newViewState);
+
+  if (newViewState === viewState.INDIVIDUALS) {
+    assert(oldDiffing || oldSelected);
+    return Object.freeze({
+      state: newViewState,
+      previous: Object.freeze({
+        state: view.state,
+        selected: oldSelected,
+        diffing: oldDiffing,
+      }),
+    });
+  }
+
+  return Object.freeze({
+    state: newViewState,
+    previous: null,
+  });
+};
+
+const DEFAULT_VIEW = {
+  state: viewState.TREE_MAP,
+  previous: null,
+};
+
+module.exports = function (view = DEFAULT_VIEW, action) {
+  const handler = handlers[action.type];
+  return handler ? handler(view, action) : view;
+};
-- 
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