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+/* 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";
+
+this.EXPORTED_SYMBOLS = ["PageStyle"];
+
+const Ci = Components.interfaces;
+
+/**
+ * The external API exported by this module.
+ */
+this.PageStyle = Object.freeze({
+ collect: function (docShell, frameTree) {
+ return PageStyleInternal.collect(docShell, frameTree);
+ },
+
+ restoreTree: function (docShell, data) {
+ PageStyleInternal.restoreTree(docShell, data);
+ }
+});
+
+// Signifies that author style level is disabled for the page.
+const NO_STYLE = "_nostyle";
+
+var PageStyleInternal = {
+ /**
+ * Collects the selected style sheet sets for all reachable frames.
+ */
+ collect: function (docShell, frameTree) {
+ let result = frameTree.map(({document: doc}) => {
+ let style;
+
+ if (doc) {
+ // http://dev.w3.org/csswg/cssom/#persisting-the-selected-css-style-sheet-set
+ style = doc.selectedStyleSheetSet || doc.lastStyleSheetSet;
+ }
+
+ return style ? {pageStyle: style} : null;
+ });
+
+ let markupDocumentViewer =
+ docShell.contentViewer;
+
+ if (markupDocumentViewer.authorStyleDisabled) {
+ result = result || {};
+ result.disabled = true;
+ }
+
+ return result && Object.keys(result).length ? result : null;
+ },
+
+ /**
+ * Restores pageStyle data for the current frame hierarchy starting at the
+ * |docShell's| current DOMWindow using the given pageStyle |data|.
+ *
+ * Warning: If the current frame hierarchy doesn't match that of the given
+ * |data| object we will silently discard data for unreachable frames. We may
+ * as well assign page styles to the wrong frames if some were reordered or
+ * removed.
+ *
+ * @param docShell (nsIDocShell)
+ * @param data (object)
+ * {
+ * disabled: true, // when true, author styles will be disabled
+ * pageStyle: "Dusk",
+ * children: [
+ * null,
+ * {pageStyle: "Mozilla", children: [ ... ]}
+ * ]
+ * }
+ */
+ restoreTree: function (docShell, data) {
+ let disabled = data.disabled || false;
+ let markupDocumentViewer =
+ docShell.contentViewer;
+ markupDocumentViewer.authorStyleDisabled = disabled;
+
+ function restoreFrame(root, data) {
+ if (data.hasOwnProperty("pageStyle")) {
+ root.document.selectedStyleSheetSet = data.pageStyle;
+ }
+
+ if (!data.hasOwnProperty("children")) {
+ return;
+ }
+
+ let frames = root.frames;
+ data.children.forEach((child, index) => {
+ if (child && index < frames.length) {
+ restoreFrame(frames[index], child);
+ }
+ });
+ }
+
+ let ifreq = docShell.QueryInterface(Ci.nsIInterfaceRequestor);
+ restoreFrame(ifreq.getInterface(Ci.nsIDOMWindow), data);
+ }
+};