mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
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301 lines
11 KiB
JavaScript
301 lines
11 KiB
JavaScript
/**
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* @license Serializer module for Rangy.
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* Serializes Ranges and Selections. An example use would be to store a user's selection on a particular page in a
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* cookie or local storage and restore it on the user's next visit to the same page.
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*
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* Part of Rangy, a cross-browser JavaScript range and selection library
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* http://code.google.com/p/rangy/
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*
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* Depends on Rangy core.
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*
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* Copyright 2011, Tim Down
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* Licensed under the MIT license.
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* Version: 1.2.2
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* Build date: 13 November 2011
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*/
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rangy.createModule("Serializer", function(api, module) {
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api.requireModules( ["WrappedSelection", "WrappedRange"] );
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var UNDEF = "undefined";
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// encodeURIComponent and decodeURIComponent are required for cookie handling
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if (typeof encodeURIComponent == UNDEF || typeof decodeURIComponent == UNDEF) {
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module.fail("Global object is missing encodeURIComponent and/or decodeURIComponent method");
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}
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// Checksum for checking whether range can be serialized
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var crc32 = (function() {
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function utf8encode(str) {
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var utf8CharCodes = [];
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for (var i = 0, len = str.length, c; i < len; ++i) {
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c = str.charCodeAt(i);
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if (c < 128) {
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utf8CharCodes.push(c);
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} else if (c < 2048) {
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utf8CharCodes.push((c >> 6) | 192, (c & 63) | 128);
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} else {
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utf8CharCodes.push((c >> 12) | 224, ((c >> 6) & 63) | 128, (c & 63) | 128);
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}
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}
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return utf8CharCodes;
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}
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var cachedCrcTable = null;
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function buildCRCTable() {
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var table = [];
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for (var i = 0, j, crc; i < 256; ++i) {
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crc = i;
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j = 8;
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while (j--) {
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if ((crc & 1) == 1) {
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crc = (crc >>> 1) ^ 0xEDB88320;
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} else {
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crc >>>= 1;
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}
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}
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table[i] = crc >>> 0;
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}
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return table;
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}
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function getCrcTable() {
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if (!cachedCrcTable) {
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cachedCrcTable = buildCRCTable();
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}
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return cachedCrcTable;
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}
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return function(str) {
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var utf8CharCodes = utf8encode(str), crc = -1, crcTable = getCrcTable();
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for (var i = 0, len = utf8CharCodes.length, y; i < len; ++i) {
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y = (crc ^ utf8CharCodes[i]) & 0xFF;
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crc = (crc >>> 8) ^ crcTable[y];
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}
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return (crc ^ -1) >>> 0;
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};
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})();
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var dom = api.dom;
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function escapeTextForHtml(str) {
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return str.replace(/</g, "<").replace(/>/g, ">");
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}
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function nodeToInfoString(node, infoParts) {
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infoParts = infoParts || [];
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var nodeType = node.nodeType, children = node.childNodes, childCount = children.length;
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var nodeInfo = [nodeType, node.nodeName, childCount].join(":");
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var start = "", end = "";
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switch (nodeType) {
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case 3: // Text node
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start = escapeTextForHtml(node.nodeValue);
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break;
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case 8: // Comment
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start = "<!--" + escapeTextForHtml(node.nodeValue) + "-->";
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break;
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default:
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start = "<" + nodeInfo + ">";
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end = "</>";
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break;
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}
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if (start) {
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infoParts.push(start);
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}
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for (var i = 0; i < childCount; ++i) {
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nodeToInfoString(children[i], infoParts);
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}
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if (end) {
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infoParts.push(end);
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}
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return infoParts;
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}
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// Creates a string representation of the specified element's contents that is similar to innerHTML but omits all
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// attributes and comments and includes child node counts. This is done instead of using innerHTML to work around
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// IE <= 8's policy of including element properties in attributes, which ruins things by changing an element's
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// innerHTML whenever the user changes an input within the element.
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function getElementChecksum(el) {
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var info = nodeToInfoString(el).join("");
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return crc32(info).toString(16);
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}
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function serializePosition(node, offset, rootNode) {
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var pathBits = [], n = node;
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rootNode = rootNode || dom.getDocument(node).documentElement;
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while (n && n != rootNode) {
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pathBits.push(dom.getNodeIndex(n, true));
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n = n.parentNode;
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}
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return pathBits.join("/") + ":" + offset;
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}
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function deserializePosition(serialized, rootNode, doc) {
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if (rootNode) {
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doc = doc || dom.getDocument(rootNode);
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} else {
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doc = doc || document;
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rootNode = doc.documentElement;
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}
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var bits = serialized.split(":");
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var node = rootNode;
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var nodeIndices = bits[0] ? bits[0].split("/") : [], i = nodeIndices.length, nodeIndex;
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while (i--) {
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nodeIndex = parseInt(nodeIndices[i], 10);
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if (nodeIndex < node.childNodes.length) {
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node = node.childNodes[parseInt(nodeIndices[i], 10)];
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} else {
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throw module.createError("deserializePosition failed: node " + dom.inspectNode(node) +
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" has no child with index " + nodeIndex + ", " + i);
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}
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}
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return new dom.DomPosition(node, parseInt(bits[1], 10));
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}
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function serializeRange(range, omitChecksum, rootNode) {
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rootNode = rootNode || api.DomRange.getRangeDocument(range).documentElement;
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if (!dom.isAncestorOf(rootNode, range.commonAncestorContainer, true)) {
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throw new Error("serializeRange: range is not wholly contained within specified root node");
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}
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var serialized = serializePosition(range.startContainer, range.startOffset, rootNode) + "," +
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serializePosition(range.endContainer, range.endOffset, rootNode);
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if (!omitChecksum) {
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serialized += "{" + getElementChecksum(rootNode) + "}";
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}
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return serialized;
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}
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function deserializeRange(serialized, rootNode, doc) {
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if (rootNode) {
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doc = doc || dom.getDocument(rootNode);
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} else {
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doc = doc || document;
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rootNode = doc.documentElement;
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}
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var result = /^([^,]+),([^,\{]+)({([^}]+)})?$/.exec(serialized);
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var checksum = result[4], rootNodeChecksum = getElementChecksum(rootNode);
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if (checksum && checksum !== getElementChecksum(rootNode)) {
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throw new Error("deserializeRange: checksums of serialized range root node (" + checksum +
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") and target root node (" + rootNodeChecksum + ") do not match");
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}
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var start = deserializePosition(result[1], rootNode, doc), end = deserializePosition(result[2], rootNode, doc);
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var range = api.createRange(doc);
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range.setStart(start.node, start.offset);
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range.setEnd(end.node, end.offset);
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return range;
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}
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function canDeserializeRange(serialized, rootNode, doc) {
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if (rootNode) {
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doc = doc || dom.getDocument(rootNode);
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} else {
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doc = doc || document;
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rootNode = doc.documentElement;
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}
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var result = /^([^,]+),([^,]+)({([^}]+)})?$/.exec(serialized);
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var checksum = result[3];
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return !checksum || checksum === getElementChecksum(rootNode);
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}
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function serializeSelection(selection, omitChecksum, rootNode) {
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selection = selection || api.getSelection();
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var ranges = selection.getAllRanges(), serializedRanges = [];
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for (var i = 0, len = ranges.length; i < len; ++i) {
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serializedRanges[i] = serializeRange(ranges[i], omitChecksum, rootNode);
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}
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return serializedRanges.join("|");
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}
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function deserializeSelection(serialized, rootNode, win) {
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if (rootNode) {
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win = win || dom.getWindow(rootNode);
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} else {
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win = win || window;
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rootNode = win.document.documentElement;
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}
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var serializedRanges = serialized.split("|");
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var sel = api.getSelection(win);
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var ranges = [];
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for (var i = 0, len = serializedRanges.length; i < len; ++i) {
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ranges[i] = deserializeRange(serializedRanges[i], rootNode, win.document);
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}
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sel.setRanges(ranges);
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return sel;
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}
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function canDeserializeSelection(serialized, rootNode, win) {
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var doc;
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if (rootNode) {
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doc = win ? win.document : dom.getDocument(rootNode);
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} else {
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win = win || window;
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rootNode = win.document.documentElement;
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}
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var serializedRanges = serialized.split("|");
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for (var i = 0, len = serializedRanges.length; i < len; ++i) {
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if (!canDeserializeRange(serializedRanges[i], rootNode, doc)) {
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return false;
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}
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}
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return true;
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}
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var cookieName = "rangySerializedSelection";
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function getSerializedSelectionFromCookie(cookie) {
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var parts = cookie.split(/[;,]/);
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for (var i = 0, len = parts.length, nameVal, val; i < len; ++i) {
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nameVal = parts[i].split("=");
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if (nameVal[0].replace(/^\s+/, "") == cookieName) {
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val = nameVal[1];
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if (val) {
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return decodeURIComponent(val.replace(/\s+$/, ""));
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}
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}
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}
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return null;
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}
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function restoreSelectionFromCookie(win) {
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win = win || window;
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var serialized = getSerializedSelectionFromCookie(win.document.cookie);
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if (serialized) {
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deserializeSelection(serialized, win.doc)
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}
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}
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function saveSelectionCookie(win, props) {
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win = win || window;
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props = (typeof props == "object") ? props : {};
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var expires = props.expires ? ";expires=" + props.expires.toUTCString() : "";
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var path = props.path ? ";path=" + props.path : "";
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var domain = props.domain ? ";domain=" + props.domain : "";
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var secure = props.secure ? ";secure" : "";
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var serialized = serializeSelection(api.getSelection(win));
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win.document.cookie = encodeURIComponent(cookieName) + "=" + encodeURIComponent(serialized) + expires + path + domain + secure;
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}
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api.serializePosition = serializePosition;
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api.deserializePosition = deserializePosition;
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api.serializeRange = serializeRange;
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api.deserializeRange = deserializeRange;
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api.canDeserializeRange = canDeserializeRange;
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api.serializeSelection = serializeSelection;
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api.deserializeSelection = deserializeSelection;
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api.canDeserializeSelection = canDeserializeSelection;
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api.restoreSelectionFromCookie = restoreSelectionFromCookie;
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api.saveSelectionCookie = saveSelectionCookie;
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api.getElementChecksum = getElementChecksum;
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});
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