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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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 constants = require("../constants");
+
+/**
+ * Initial state definition
+ */
+function getInitialState() {
+ return new Map();
+}
+
+/**
+ * Maintain a cache of received grip responses from the backend.
+ */
+function grips(state = getInitialState(), action) {
+ // This reducer supports only one action, fetching actor properties
+ // from the backend so, bail out if we are dealing with any other
+ // action.
+ if (action.type != constants.FETCH_PROPERTIES) {
+ return state;
+ }
+
+ switch (action.status) {
+ case "start":
+ return onRequestProperties(state, action);
+ case "end":
+ return onReceiveProperties(state, action);
+ }
+
+ return state;
+}
+
+/**
+ * Handle requestProperties action
+ */
+function onRequestProperties(state, action) {
+ return state;
+}
+
+/**
+ * Handle receiveProperties action
+ */
+function onReceiveProperties(cache, action) {
+ let response = action.response;
+ let from = response.from;
+ let className = action.grip.class;
+
+ // Properly deal with getters.
+ mergeProperties(response);
+
+ // Compute list of requested children.
+ let previewProps = response.preview ? response.preview.ownProperties : null;
+ let ownProps = response.ownProperties || previewProps || [];
+
+ let props = Object.keys(ownProps).map(key => {
+ // Array indexes as a special case. We convert any keys that are string
+ // representations of integers to integers.
+ if (className === "Array" && isInteger(key)) {
+ key = parseInt(key, 10);
+ }
+ return new Property(key, ownProps[key], key);
+ });
+
+ props.sort(sortName);
+
+ // Return new state/map.
+ let newCache = new Map(cache);
+ newCache.set(from, props);
+
+ return newCache;
+}
+
+// Helpers
+
+function mergeProperties(response) {
+ let { ownProperties } = response;
+
+ // 'safeGetterValues' is new and isn't necessary defined on old grips.
+ let safeGetterValues = response.safeGetterValues || {};
+
+ // Merge the safe getter values into one object such that we can use it
+ // in variablesView.
+ for (let name of Object.keys(safeGetterValues)) {
+ if (name in ownProperties) {
+ let { getterValue, getterPrototypeLevel } = safeGetterValues[name];
+ ownProperties[name].getterValue = getterValue;
+ ownProperties[name].getterPrototypeLevel = getterPrototypeLevel;
+ } else {
+ ownProperties[name] = safeGetterValues[name];
+ }
+ }
+}
+
+function sortName(a, b) {
+ // Display non-enumerable properties at the end.
+ if (!a.value.enumerable && b.value.enumerable) {
+ return 1;
+ }
+ if (a.value.enumerable && !b.value.enumerable) {
+ return -1;
+ }
+ return a.name > b.name ? 1 : -1;
+}
+
+function isInteger(n) {
+ // We use parseInt(n, 10) == n to disregard scientific notation e.g. "3e24"
+ return isFinite(n) && parseInt(n, 10) == n;
+}
+
+function Property(name, value, key) {
+ this.name = name;
+ this.value = value;
+ this.key = key;
+}
+
+// Exports from this module
+exports.grips = grips;
+exports.Property = Property;