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1359 lines
49 KiB
JavaScript
1359 lines
49 KiB
JavaScript
(function() {
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"use strict";
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var diffcount;
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var Diff = function (options) {
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var diff = this;
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Object.keys(options).forEach(function(option) {
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diff[option] = options[option];
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});
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};
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Diff.prototype = {
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toString: function() {
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return JSON.stringify(this);
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}
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// TODO: compress diff output by replacing these keys with numbers or alike:
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/* 'addAttribute' = 0,
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'modifyAttribute' = 1,
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'removeAttribute' = 2,
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'modifyTextElement' = 3,
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'relocateGroup' = 4,
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'removeElement' = 5,
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'addElement' = 6,
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'removeTextElement' = 7,
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'addTextElement' = 8,
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'replaceElement' = 9,
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'modifyValue' = 10,
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'modifyChecked' = 11,
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'modifySelected' = 12,
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'modifyComment' = 13,
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'action' = 14,
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'route' = 15,
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'oldValue' = 16,
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'newValue' = 17,
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'element' = 18,
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'group' = 19,
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'from' = 20,
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'to' = 21,
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'name' = 22,
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'value' = 23,
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'data' = 24,
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'attributes' = 25,
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'nodeName' = 26,
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'childNodes' = 27,
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'checked' = 28,
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'selected' = 29;*/
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};
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var SubsetMapping = function SubsetMapping(a, b) {
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this.oldValue = a;
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this.newValue = b;
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};
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SubsetMapping.prototype = {
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contains: function contains(subset) {
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if (subset.length < this.length) {
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return subset.newValue >= this.newValue && subset.newValue < this.newValue + this.length;
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}
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return false;
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},
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toString: function toString() {
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return this.length + " element subset, first mapping: old " + this.oldValue + " → new " + this.newValue;
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}
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};
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var elementDescriptors = function(el) {
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var output = [];
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if (el.nodeName !== '#text' && el.nodeName !== '#comment') {
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output.push(el.nodeName);
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if (el.attributes) {
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if (el.attributes['class']) {
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output.push(el.nodeName + '.' + el.attributes['class'].replace(/ /g, '.'));
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}
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if (el.attributes.id) {
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output.push(el.nodeName + '#' + el.attributes.id);
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}
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}
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}
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return output;
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};
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var findUniqueDescriptors = function(li) {
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var uniqueDescriptors = {},
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duplicateDescriptors = {};
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li.forEach(function(node) {
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elementDescriptors(node).forEach(function(descriptor) {
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var inUnique = descriptor in uniqueDescriptors,
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inDupes = descriptor in duplicateDescriptors;
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if (!inUnique && !inDupes) {
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uniqueDescriptors[descriptor] = true;
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} else if (inUnique) {
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delete uniqueDescriptors[descriptor];
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duplicateDescriptors[descriptor] = true;
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}
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});
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});
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return uniqueDescriptors;
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};
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var uniqueInBoth = function(l1, l2) {
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var l1Unique = findUniqueDescriptors(l1),
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l2Unique = findUniqueDescriptors(l2),
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inBoth = {};
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Object.keys(l1Unique).forEach(function(key) {
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if (l2Unique[key]) {
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inBoth[key] = true;
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}
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});
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return inBoth;
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};
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var removeDone = function(tree) {
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delete tree.outerDone;
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delete tree.innerDone;
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delete tree.valueDone;
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if (tree.childNodes) {
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return tree.childNodes.every(removeDone);
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} else {
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return true;
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}
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};
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var isEqual = function(e1, e2) {
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var e1Attributes, e2Attributes;
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if (!['nodeName', 'value', 'checked', 'selected', 'data'].every(function(element) {
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if (e1[element] !== e2[element]) {
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return false;
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}
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return true;
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})) {
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return false;
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}
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if (Boolean(e1.attributes) !== Boolean(e2.attributes)) {
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return false;
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}
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if (Boolean(e1.childNodes) !== Boolean(e2.childNodes)) {
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return false;
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}
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if (e1.attributes) {
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e1Attributes = Object.keys(e1.attributes);
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e2Attributes = Object.keys(e2.attributes);
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if (e1Attributes.length !== e2Attributes.length) {
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return false;
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}
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if (!e1Attributes.every(function(attribute) {
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if (e1.attributes[attribute] !== e2.attributes[attribute]) {
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return false;
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}
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})) {
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return false;
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}
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}
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if (e1.childNodes) {
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if (e1.childNodes.length !== e2.childNodes.length) {
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return false;
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}
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if (!e1.childNodes.every(function(childNode, index) {
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return isEqual(childNode, e2.childNodes[index]);
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})) {
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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 roughlyEqual = function(e1, e2, uniqueDescriptors, sameSiblings, preventRecursion) {
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var childUniqueDescriptors, nodeList1, nodeList2;
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if (!e1 || !e2) {
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return false;
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}
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if (e1.nodeName !== e2.nodeName) {
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return false;
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}
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if (e1.nodeName === '#text') {
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// Note that we initially don't care what the text content of a node is,
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// the mere fact that it's the same tag and "has text" means it's roughly
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// equal, and then we can find out the true text difference later.
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return preventRecursion ? true : e1.data === e2.data;
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}
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if (e1.nodeName in uniqueDescriptors) {
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return true;
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}
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if (e1.attributes && e2.attributes) {
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if (e1.attributes.id && e1.attributes.id === e2.attributes.id) {
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var idDescriptor = e1.nodeName + '#' + e1.attributes.id;
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if (idDescriptor in uniqueDescriptors) {
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return true;
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}
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}
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if (e1.attributes['class'] && e1.attributes['class'] === e2.attributes['class']) {
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var classDescriptor = e1.nodeName + '.' + e1.attributes['class'].replace(/ /g, '.');
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if (classDescriptor in uniqueDescriptors) {
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return true;
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}
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}
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}
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if (sameSiblings) {
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return true;
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}
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nodeList1 = e1.childNodes ? e1.childNodes.slice().reverse() : [];
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nodeList2 = e2.childNodes ? e2.childNodes.slice().reverse() : [];
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if (nodeList1.length !== nodeList2.length) {
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return false;
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}
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if (preventRecursion) {
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return nodeList1.every(function(element, index) {
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return element.nodeName === nodeList2[index].nodeName;
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});
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} else {
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// note: we only allow one level of recursion at any depth. If 'preventRecursion'
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// was not set, we must explicitly force it to true for child iterations.
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childUniqueDescriptors = uniqueInBoth(nodeList1, nodeList2);
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return nodeList1.every(function(element, index) {
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return roughlyEqual(element, nodeList2[index], childUniqueDescriptors, true, true);
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});
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}
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};
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var cloneObj = function(obj) {
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// TODO: Do we really need to clone here? Is it not enough to just return the original object?
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return JSON.parse(JSON.stringify(obj));
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//return obj;
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};
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/**
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* based on https://en.wikibooks.org/wiki/Algorithm_implementation/Strings/Longest_common_substring#JavaScript
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*/
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var findCommonSubsets = function(c1, c2, marked1, marked2) {
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var lcsSize = 0,
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index = [],
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matches = Array.apply(null, new Array(c1.length + 1)).map(function() {
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return [];
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}), // set up the matching table
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uniqueDescriptors = uniqueInBoth(c1, c2),
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// If all of the elements are the same tag, id and class, then we can
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// consider them roughly the same even if they have a different number of
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// children. This will reduce removing and re-adding similar elements.
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subsetsSame = c1.length === c2.length,
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origin, ret;
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if (subsetsSame) {
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c1.some(function(element, i) {
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var c1Desc = elementDescriptors(element),
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c2Desc = elementDescriptors(c2[i]);
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if (c1Desc.length !== c2Desc.length) {
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subsetsSame = false;
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return true;
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}
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c1Desc.some(function(description, i) {
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if (description !== c2Desc[i]) {
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subsetsSame = false;
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return true;
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}
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});
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if (!subsetsSame) {
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return true;
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}
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});
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}
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// fill the matches with distance values
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c1.forEach(function(c1Element, c1Index) {
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c2.forEach(function(c2Element, c2Index) {
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if (!marked1[c1Index] && !marked2[c2Index] && roughlyEqual(c1Element, c2Element, uniqueDescriptors, subsetsSame)) {
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matches[c1Index + 1][c2Index + 1] = (matches[c1Index][c2Index] ? matches[c1Index][c2Index] + 1 : 1);
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if (matches[c1Index + 1][c2Index + 1] >= lcsSize) {
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lcsSize = matches[c1Index + 1][c2Index + 1];
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index = [c1Index + 1, c2Index + 1];
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}
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} else {
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matches[c1Index + 1][c2Index + 1] = 0;
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}
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});
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});
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if (lcsSize === 0) {
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return false;
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}
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origin = [index[0] - lcsSize, index[1] - lcsSize];
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ret = new SubsetMapping(origin[0], origin[1]);
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ret.length = lcsSize;
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return ret;
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};
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/**
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* This should really be a predefined function in Array...
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*/
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var makeArray = function(n, v) {
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return Array.apply(null, new Array(n)).map(function() {
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return v;
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});
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};
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/**
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* Generate arrays that indicate which node belongs to which subset,
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* or whether it's actually an orphan node, existing in only one
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* of the two trees, rather than somewhere in both.
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*
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* So if t1 = <img><canvas><br>, t2 = <canvas><br><img>.
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* The longest subset is "<canvas><br>" (length 2), so it will group 0.
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* The second longest is "<img>" (length 1), so it will be group 1.
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* gaps1 will therefore be [1,0,0] and gaps2 [0,0,1].
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*
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* If an element is not part of any group, it will stay being 'true', which
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* is the initial value. For example:
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* t1 = <img><p></p><br><canvas>, t2 = <b></b><br><canvas><img>
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*
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* The "<p></p>" and "<b></b>" do only show up in one of the two and will
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* therefore be marked by "true". The remaining parts are parts of the
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* groups 0 and 1:
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* gaps1 = [1, true, 0, 0], gaps2 = [true, 0, 0, 1]
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*
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*/
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var getGapInformation = function(t1, t2, stable) {
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var gaps1 = t1.childNodes ? makeArray(t1.childNodes.length, true) : [],
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gaps2 = t2.childNodes ? makeArray(t2.childNodes.length, true) : [],
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group = 0;
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// give elements from the same subset the same group number
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stable.forEach(function(subset) {
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var i, endOld = subset.oldValue + subset.length,
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endNew = subset.newValue + subset.length;
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for (i = subset.oldValue; i < endOld; i += 1) {
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gaps1[i] = group;
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}
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for (i = subset.newValue; i < endNew; i += 1) {
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gaps2[i] = group;
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}
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group += 1;
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});
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return {
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gaps1: gaps1,
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gaps2: gaps2
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};
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};
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/**
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* Find all matching subsets, based on immediate child differences only.
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*/
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var markSubTrees = function(oldTree, newTree) {
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// note: the child lists are views, and so update as we update old/newTree
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var oldChildren = oldTree.childNodes ? oldTree.childNodes : [],
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newChildren = newTree.childNodes ? newTree.childNodes : [],
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marked1 = makeArray(oldChildren.length, false),
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marked2 = makeArray(newChildren.length, false),
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subsets = [],
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subset = true,
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returnIndex = function() {
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return arguments[1];
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},
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markBoth = function(i) {
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marked1[subset.oldValue + i] = true;
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marked2[subset.newValue + i] = true;
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};
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while (subset) {
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subset = findCommonSubsets(oldChildren, newChildren, marked1, marked2);
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if (subset) {
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subsets.push(subset);
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Array.apply(null, new Array(subset.length)).map(returnIndex).forEach(markBoth);
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}
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}
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return subsets;
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};
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function swap(obj, p1, p2) {
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(function(_) {
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obj[p1] = obj[p2];
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obj[p2] = _;
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}(obj[p1]));
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}
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var DiffTracker = function() {
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this.list = [];
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};
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DiffTracker.prototype = {
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list: false,
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add: function(diffs) {
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var list = this.list;
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diffs.forEach(function(diff) {
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list.push(diff);
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});
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},
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forEach: function(fn) {
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this.list.forEach(fn);
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}
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};
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var diffDOM = function(options) {
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var defaults = {
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debug: false,
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diffcap: 10, // Limit for how many diffs are accepting when debugging. Inactive when debug is false.
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maxDepth: false, // False or a numeral. If set to a numeral, limits the level of depth that the the diff mechanism looks for differences. If false, goes through the entire tree.
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valueDiffing: true, // Whether to take into consideration the values of forms that differ from auto assigned values (when a user fills out a form).
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// syntax: textDiff: function (node, currentValue, expectedValue, newValue)
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textDiff: function() {
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arguments[0].data = arguments[3];
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return;
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},
|
|
// empty functions were benchmarked as running faster than both
|
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// `f && f()` and `if (f) { f(); }`
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preVirtualDiffApply: function () {},
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postVirtualDiffApply: function () {},
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preDiffApply: function () {},
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postDiffApply: function () {},
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filterOuterDiff: null
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},
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i;
|
|
|
|
if (typeof options === "undefined") {
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options = {};
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|
}
|
|
|
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for (i in defaults) {
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if (typeof options[i] === "undefined") {
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this[i] = defaults[i];
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} else {
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this[i] = options[i];
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}
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}
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|
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|
};
|
|
|
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diffDOM.Diff = Diff;
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|
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diffDOM.prototype = {
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|
|
|
// ===== Create a diff =====
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|
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diff: function(t1Node, t2Node) {
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|
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|
var t1 = this.nodeToObj(t1Node),
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|
t2 = this.nodeToObj(t2Node);
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|
|
|
diffcount = 0;
|
|
|
|
if (this.debug) {
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|
this.t1Orig = this.nodeToObj(t1Node);
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|
this.t2Orig = this.nodeToObj(t2Node);
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|
}
|
|
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|
this.tracker = new DiffTracker();
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|
return this.findDiffs(t1, t2);
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|
},
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|
findDiffs: function(t1, t2) {
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|
var diffs;
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|
do {
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|
if (this.debug) {
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|
diffcount += 1;
|
|
if (diffcount > this.diffcap) {
|
|
window.diffError = [this.t1Orig, this.t2Orig];
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|
throw new Error("surpassed diffcap:" + JSON.stringify(this.t1Orig) + " -> " + JSON.stringify(this.t2Orig));
|
|
}
|
|
}
|
|
diffs = this.findNextDiff(t1, t2, []);
|
|
if (diffs.length === 0) {
|
|
// Last check if the elements really are the same now.
|
|
// If not, remove all info about being done and start over.
|
|
// Somtimes a node can be marked as done, but the creation of subsequent diffs means that it has to be changed anyway.
|
|
if (!isEqual(t1, t2)) {
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|
removeDone(t1);
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|
diffs = this.findNextDiff(t1, t2, []);
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|
}
|
|
}
|
|
|
|
if (diffs.length > 0) {
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|
this.tracker.add(diffs);
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|
this.applyVirtual(t1, diffs);
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}
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|
} while (diffs.length > 0);
|
|
return this.tracker.list;
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|
},
|
|
findNextDiff: function(t1, t2, route) {
|
|
var diffs, fdiffs;
|
|
|
|
if (this.maxDepth && route.length > this.maxDepth) {
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|
return [];
|
|
}
|
|
// outer differences?
|
|
if (!t1.outerDone) {
|
|
diffs = this.findOuterDiff(t1, t2, route);
|
|
if (this.filterOuterDiff) {
|
|
fdiffs = this.filterOuterDiff(t1, t2, diffs);
|
|
if (fdiffs) diffs = fdiffs;
|
|
}
|
|
if (diffs.length > 0) {
|
|
t1.outerDone = true;
|
|
return diffs;
|
|
} else {
|
|
t1.outerDone = true;
|
|
}
|
|
}
|
|
// inner differences?
|
|
if (!t1.innerDone) {
|
|
diffs = this.findInnerDiff(t1, t2, route);
|
|
if (diffs.length > 0) {
|
|
return diffs;
|
|
} else {
|
|
t1.innerDone = true;
|
|
}
|
|
}
|
|
|
|
if (this.valueDiffing && !t1.valueDone) {
|
|
// value differences?
|
|
diffs = this.findValueDiff(t1, t2, route);
|
|
|
|
if (diffs.length > 0) {
|
|
t1.valueDone = true;
|
|
return diffs;
|
|
} else {
|
|
t1.valueDone = true;
|
|
}
|
|
}
|
|
|
|
// no differences
|
|
return [];
|
|
},
|
|
findOuterDiff: function(t1, t2, route) {
|
|
|
|
var diffs = [],
|
|
attr1, attr2;
|
|
|
|
if (t1.nodeName !== t2.nodeName) {
|
|
return [new Diff({
|
|
action: 'replaceElement',
|
|
oldValue: cloneObj(t1),
|
|
newValue: cloneObj(t2),
|
|
route: route
|
|
})];
|
|
}
|
|
|
|
if (t1.data !== t2.data) {
|
|
// Comment or text node.
|
|
if (t1.nodeName === '#text') {
|
|
return [new Diff({
|
|
action: 'modifyTextElement',
|
|
route: route,
|
|
oldValue: t1.data,
|
|
newValue: t2.data
|
|
})];
|
|
} else {
|
|
return [new Diff({
|
|
action: 'modifyComment',
|
|
route: route,
|
|
oldValue: t1.data,
|
|
newValue: t2.data
|
|
})];
|
|
}
|
|
|
|
}
|
|
|
|
|
|
attr1 = t1.attributes ? Object.keys(t1.attributes).sort() : [];
|
|
attr2 = t2.attributes ? Object.keys(t2.attributes).sort() : [];
|
|
|
|
attr1.forEach(function(attr) {
|
|
var pos = attr2.indexOf(attr);
|
|
if (pos === -1) {
|
|
diffs.push(new Diff({
|
|
action: 'removeAttribute',
|
|
route: route,
|
|
name: attr,
|
|
value: t1.attributes[attr]
|
|
}));
|
|
} else {
|
|
attr2.splice(pos, 1);
|
|
if (t1.attributes[attr] !== t2.attributes[attr]) {
|
|
diffs.push(new Diff({
|
|
action: 'modifyAttribute',
|
|
route: route,
|
|
name: attr,
|
|
oldValue: t1.attributes[attr],
|
|
newValue: t2.attributes[attr]
|
|
}));
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
|
|
attr2.forEach(function(attr) {
|
|
diffs.push(new Diff({
|
|
action: 'addAttribute',
|
|
route: route,
|
|
name: attr,
|
|
value: t2.attributes[attr]
|
|
}));
|
|
|
|
});
|
|
|
|
return diffs;
|
|
},
|
|
nodeToObj: function(node) {
|
|
var objNode = {}, dobj = this;
|
|
objNode.nodeName = node.nodeName;
|
|
if (objNode.nodeName === '#text' || objNode.nodeName === '#comment') {
|
|
objNode.data = node.data;
|
|
} else {
|
|
if (node.attributes && node.attributes.length > 0) {
|
|
objNode.attributes = {};
|
|
Array.prototype.slice.call(node.attributes).forEach(
|
|
function(attribute) {
|
|
objNode.attributes[attribute.name] = attribute.value;
|
|
}
|
|
);
|
|
}
|
|
if (node.childNodes && node.childNodes.length > 0) {
|
|
objNode.childNodes = [];
|
|
Array.prototype.slice.call(node.childNodes).forEach(
|
|
function(childNode) {
|
|
objNode.childNodes.push(dobj.nodeToObj(childNode));
|
|
}
|
|
);
|
|
}
|
|
if (this.valueDiffing) {
|
|
if (node.value !== undefined) {
|
|
objNode.value = node.value;
|
|
}
|
|
if (node.checked !== undefined) {
|
|
objNode.checked = node.checked;
|
|
}
|
|
if (node.selected !== undefined) {
|
|
objNode.selected = node.selected;
|
|
}
|
|
}
|
|
}
|
|
|
|
return objNode;
|
|
},
|
|
objToNode: function(objNode, insideSvg) {
|
|
var node, dobj = this;
|
|
if (objNode.nodeName === '#text') {
|
|
node = document.createTextNode(objNode.data);
|
|
|
|
} else if (objNode.nodeName === '#comment') {
|
|
node = document.createComment(objNode.data);
|
|
} else {
|
|
if (objNode.nodeName === 'svg' || insideSvg) {
|
|
node = document.createElementNS('http://www.w3.org/2000/svg', objNode.nodeName);
|
|
insideSvg = true;
|
|
} else {
|
|
node = document.createElement(objNode.nodeName);
|
|
}
|
|
if (objNode.attributes) {
|
|
Object.keys(objNode.attributes).forEach(function(attribute) {
|
|
node.setAttribute(attribute, objNode.attributes[attribute]);
|
|
});
|
|
}
|
|
if (objNode.childNodes) {
|
|
objNode.childNodes.forEach(function(childNode) {
|
|
try {
|
|
node.appendChild(dobj.objToNode(childNode, insideSvg));
|
|
} catch (e) { console.debug(e); }
|
|
});
|
|
}
|
|
if (this.valueDiffing) {
|
|
if (objNode.value) {
|
|
node.value = objNode.value;
|
|
}
|
|
if (objNode.checked) {
|
|
node.checked = objNode.checked;
|
|
}
|
|
if (objNode.selected) {
|
|
node.selected = objNode.selected;
|
|
}
|
|
}
|
|
}
|
|
return node;
|
|
},
|
|
findInnerDiff: function(t1, t2, route) {
|
|
|
|
var subtrees = (t1.childNodes && t2.childNodes) ? markSubTrees(t1, t2) : [],
|
|
t1ChildNodes = t1.childNodes ? t1.childNodes : [],
|
|
t2ChildNodes = t2.childNodes ? t2.childNodes : [],
|
|
childNodesLengthDifference, diffs = [],
|
|
index = 0,
|
|
last, e1, e2, i;
|
|
|
|
if (subtrees.length > 0) {
|
|
/* One or more groups have been identified among the childnodes of t1
|
|
* and t2.
|
|
*/
|
|
diffs = this.attemptGroupRelocation(t1, t2, subtrees, route);
|
|
if (diffs.length > 0) {
|
|
return diffs;
|
|
}
|
|
}
|
|
|
|
/* 0 or 1 groups of similar child nodes have been found
|
|
* for t1 and t2. 1 If there is 1, it could be a sign that the
|
|
* contents are the same. When the number of groups is below 2,
|
|
* t1 and t2 are made to have the same length and each of the
|
|
* pairs of child nodes are diffed.
|
|
*/
|
|
|
|
|
|
last = Math.max(t1ChildNodes.length, t2ChildNodes.length);
|
|
if (t1ChildNodes.length !== t2ChildNodes.length) {
|
|
childNodesLengthDifference = true;
|
|
}
|
|
|
|
for (i = 0; i < last; i += 1) {
|
|
e1 = t1ChildNodes[i];
|
|
e2 = t2ChildNodes[i];
|
|
|
|
if (childNodesLengthDifference) {
|
|
/* t1 and t2 have different amounts of childNodes. Add
|
|
* and remove as necessary to obtain the same length */
|
|
if (e1 && !e2) {
|
|
if (e1.nodeName === '#text') {
|
|
diffs.push(new Diff({
|
|
action: 'removeTextElement',
|
|
route: route.concat(index),
|
|
value: e1.data
|
|
}));
|
|
index -= 1;
|
|
} else {
|
|
diffs.push(new Diff({
|
|
action: 'removeElement',
|
|
route: route.concat(index),
|
|
element: cloneObj(e1)
|
|
}));
|
|
index -= 1;
|
|
}
|
|
|
|
} else if (e2 && !e1) {
|
|
if (e2.nodeName === '#text') {
|
|
diffs.push(new Diff({
|
|
action: 'addTextElement',
|
|
route: route.concat(i),
|
|
value: e2.data
|
|
}));
|
|
} else {
|
|
diffs.push(new Diff({
|
|
action: 'addElement',
|
|
route: route.concat(i),
|
|
element: cloneObj(e2)
|
|
}));
|
|
}
|
|
}
|
|
}
|
|
/* We are now guaranteed that childNodes e1 and e2 exist,
|
|
* and that they can be diffed.
|
|
*/
|
|
/* Diffs in child nodes should not affect the parent node,
|
|
* so we let these diffs be submitted together with other
|
|
* diffs.
|
|
*/
|
|
|
|
if (e1 && e2) {
|
|
diffs = diffs.concat(this.findNextDiff(e1, e2, route.concat(index)));
|
|
}
|
|
|
|
index += 1;
|
|
|
|
}
|
|
t1.innerDone = true;
|
|
return diffs;
|
|
|
|
},
|
|
|
|
attemptGroupRelocation: function(t1, t2, subtrees, route) {
|
|
/* Either t1.childNodes and t2.childNodes have the same length, or
|
|
* there are at least two groups of similar elements can be found.
|
|
* attempts are made at equalizing t1 with t2. First all initial
|
|
* elements with no group affiliation (gaps=true) are removed (if
|
|
* only in t1) or added (if only in t2). Then the creation of a group
|
|
* relocation diff is attempted.
|
|
*/
|
|
|
|
var gapInformation = getGapInformation(t1, t2, subtrees),
|
|
gaps1 = gapInformation.gaps1,
|
|
gaps2 = gapInformation.gaps2,
|
|
shortest = Math.min(gaps1.length, gaps2.length),
|
|
destinationDifferent, toGroup,
|
|
group, node, similarNode, testI, diffs = [],
|
|
index1, index2, j;
|
|
|
|
|
|
for (index2 = 0, index1 = 0; index2 < shortest; index1 += 1, index2 += 1) {
|
|
if (gaps1[index2] === true) {
|
|
node = t1.childNodes[index1];
|
|
if (node.nodeName === '#text') {
|
|
if (t2.childNodes[index2].nodeName === '#text' && node.data !== t2.childNodes[index2].data) {
|
|
testI = index1;
|
|
while (t1.childNodes.length > testI + 1 && t1.childNodes[testI + 1].nodeName === '#text') {
|
|
testI += 1;
|
|
if (t2.childNodes[index2].data === t1.childNodes[testI].data) {
|
|
similarNode = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!similarNode) {
|
|
diffs.push(new Diff({
|
|
action: 'modifyTextElement',
|
|
route: route.concat(index2),
|
|
oldValue: node.data,
|
|
newValue: t2.childNodes[index2].data
|
|
}));
|
|
return diffs;
|
|
}
|
|
}
|
|
diffs.push(new Diff({
|
|
action: 'removeTextElement',
|
|
route: route.concat(index2),
|
|
value: node.data
|
|
}));
|
|
gaps1.splice(index2, 1);
|
|
shortest = Math.min(gaps1.length, gaps2.length);
|
|
index2 -= 1;
|
|
} else {
|
|
diffs.push(new Diff({
|
|
action: 'removeElement',
|
|
route: route.concat(index2),
|
|
element: cloneObj(node)
|
|
}));
|
|
gaps1.splice(index2, 1);
|
|
shortest = Math.min(gaps1.length, gaps2.length);
|
|
index2 -= 1;
|
|
}
|
|
|
|
} else if (gaps2[index2] === true) {
|
|
node = t2.childNodes[index2];
|
|
if (node.nodeName === '#text') {
|
|
diffs.push(new Diff({
|
|
action: 'addTextElement',
|
|
route: route.concat(index2),
|
|
value: node.data
|
|
}));
|
|
gaps1.splice(index2, 0, true);
|
|
shortest = Math.min(gaps1.length, gaps2.length);
|
|
index1 -= 1;
|
|
} else {
|
|
diffs.push(new Diff({
|
|
action: 'addElement',
|
|
route: route.concat(index2),
|
|
element: cloneObj(node)
|
|
}));
|
|
gaps1.splice(index2, 0, true);
|
|
shortest = Math.min(gaps1.length, gaps2.length);
|
|
index1 -= 1;
|
|
}
|
|
|
|
} else if (gaps1[index2] !== gaps2[index2]) {
|
|
if (diffs.length > 0) {
|
|
return diffs;
|
|
}
|
|
// group relocation
|
|
group = subtrees[gaps1[index2]];
|
|
toGroup = Math.min(group.newValue, (t1.childNodes.length - group.length));
|
|
if (toGroup !== group.oldValue) {
|
|
// Check whether destination nodes are different than originating ones.
|
|
destinationDifferent = false;
|
|
for (j = 0; j < group.length; j += 1) {
|
|
if (!roughlyEqual(t1.childNodes[toGroup + j], t1.childNodes[group.oldValue + j], [], false, true)) {
|
|
destinationDifferent = true;
|
|
}
|
|
}
|
|
if (destinationDifferent) {
|
|
return [new Diff({
|
|
action: 'relocateGroup',
|
|
groupLength: group.length,
|
|
from: group.oldValue,
|
|
to: toGroup,
|
|
route: route
|
|
})];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return diffs;
|
|
},
|
|
|
|
findValueDiff: function(t1, t2, route) {
|
|
// Differences of value. Only useful if the value/selection/checked value
|
|
// differs from what is represented in the DOM. For example in the case
|
|
// of filled out forms, etc.
|
|
var diffs = [];
|
|
|
|
if (t1.selected !== t2.selected) {
|
|
diffs.push(new Diff({
|
|
action: 'modifySelected',
|
|
oldValue: t1.selected,
|
|
newValue: t2.selected,
|
|
route: route
|
|
}));
|
|
}
|
|
|
|
if ((t1.value || t2.value) && t1.value !== t2.value && t1.nodeName !== 'OPTION') {
|
|
diffs.push(new Diff({
|
|
action: 'modifyValue',
|
|
oldValue: t1.value,
|
|
newValue: t2.value,
|
|
route: route
|
|
}));
|
|
}
|
|
if (t1.checked !== t2.checked) {
|
|
diffs.push(new Diff({
|
|
action: 'modifyChecked',
|
|
oldValue: t1.checked,
|
|
newValue: t2.checked,
|
|
route: route
|
|
}));
|
|
}
|
|
|
|
return diffs;
|
|
},
|
|
|
|
// ===== Apply a virtual diff =====
|
|
|
|
applyVirtual: function(tree, diffs) {
|
|
var dobj = this;
|
|
if (diffs.length === 0) {
|
|
return true;
|
|
}
|
|
diffs.forEach(function(diff) {
|
|
dobj.applyVirtualDiff(tree, diff);
|
|
});
|
|
return true;
|
|
},
|
|
getFromVirtualRoute: function(tree, route) {
|
|
var node = tree,
|
|
parentNode, nodeIndex;
|
|
|
|
route = route.slice();
|
|
while (route.length > 0) {
|
|
if (!node.childNodes) {
|
|
return false;
|
|
}
|
|
nodeIndex = route.splice(0, 1)[0];
|
|
parentNode = node;
|
|
node = node.childNodes[nodeIndex];
|
|
}
|
|
return {
|
|
node: node,
|
|
parentNode: parentNode,
|
|
nodeIndex: nodeIndex
|
|
};
|
|
},
|
|
applyVirtualDiff: function(tree, diff) {
|
|
var routeInfo = this.getFromVirtualRoute(tree, diff.route),
|
|
node = routeInfo.node,
|
|
parentNode = routeInfo.parentNode,
|
|
nodeIndex = routeInfo.nodeIndex,
|
|
newNode, route, c;
|
|
|
|
// pre-diff hook
|
|
var info = {
|
|
diff: diff,
|
|
node: node
|
|
};
|
|
|
|
if (this.preVirtualDiffApply(info)) { return true; }
|
|
|
|
switch (diff.action) {
|
|
case 'addAttribute':
|
|
if (!node.attributes) {
|
|
node.attributes = {};
|
|
}
|
|
|
|
node.attributes[diff.name] = diff.value;
|
|
|
|
if (diff.name === 'checked') {
|
|
node.checked = true;
|
|
} else if (diff.name === 'selected') {
|
|
node.selected = true;
|
|
} else if (node.nodeName === 'INPUT' && diff.name === 'value') {
|
|
node.value = diff.value;
|
|
}
|
|
|
|
break;
|
|
case 'modifyAttribute':
|
|
node.attributes[diff.name] = diff.newValue;
|
|
if (node.nodeName === 'INPUT' && diff.name === 'value') {
|
|
node.value = diff.value;
|
|
}
|
|
break;
|
|
case 'removeAttribute':
|
|
|
|
delete node.attributes[diff.name];
|
|
|
|
if (Object.keys(node.attributes).length === 0) {
|
|
delete node.attributes;
|
|
}
|
|
|
|
if (diff.name === 'checked') {
|
|
node.checked = false;
|
|
} else if (diff.name === 'selected') {
|
|
delete node.selected;
|
|
} else if (node.nodeName === 'INPUT' && diff.name === 'value') {
|
|
delete node.value;
|
|
}
|
|
|
|
break;
|
|
case 'modifyTextElement':
|
|
node.data = diff.newValue;
|
|
|
|
if (parentNode.nodeName === 'TEXTAREA') {
|
|
parentNode.value = diff.newValue;
|
|
}
|
|
break;
|
|
case 'modifyValue':
|
|
node.value = diff.newValue;
|
|
break;
|
|
case 'modifyComment':
|
|
node.data = diff.newValue;
|
|
break;
|
|
case 'modifyChecked':
|
|
node.checked = diff.newValue;
|
|
break;
|
|
case 'modifySelected':
|
|
node.selected = diff.newValue;
|
|
break;
|
|
case 'replaceElement':
|
|
newNode = cloneObj(diff.newValue);
|
|
newNode.outerDone = true;
|
|
newNode.innerDone = true;
|
|
newNode.valueDone = true;
|
|
parentNode.childNodes[nodeIndex] = newNode;
|
|
break;
|
|
case 'relocateGroup':
|
|
node.childNodes.splice(diff.from, diff.groupLength).reverse()
|
|
.forEach(function(movedNode) {
|
|
node.childNodes.splice(diff.to, 0, movedNode);
|
|
});
|
|
break;
|
|
case 'removeElement':
|
|
parentNode.childNodes.splice(nodeIndex, 1);
|
|
break;
|
|
case 'addElement':
|
|
route = diff.route.slice();
|
|
c = route.splice(route.length - 1, 1)[0];
|
|
node = this.getFromVirtualRoute(tree, route).node;
|
|
newNode = cloneObj(diff.element);
|
|
newNode.outerDone = true;
|
|
newNode.innerDone = true;
|
|
newNode.valueDone = true;
|
|
|
|
if (!node.childNodes) {
|
|
node.childNodes = [];
|
|
}
|
|
|
|
if (c >= node.childNodes.length) {
|
|
node.childNodes.push(newNode);
|
|
} else {
|
|
node.childNodes.splice(c, 0, newNode);
|
|
}
|
|
break;
|
|
case 'removeTextElement':
|
|
parentNode.childNodes.splice(nodeIndex, 1);
|
|
if (parentNode.nodeName === 'TEXTAREA') {
|
|
delete parentNode.value;
|
|
}
|
|
break;
|
|
case 'addTextElement':
|
|
route = diff.route.slice();
|
|
c = route.splice(route.length - 1, 1)[0];
|
|
newNode = {};
|
|
newNode.nodeName = '#text';
|
|
newNode.data = diff.value;
|
|
node = this.getFromVirtualRoute(tree, route).node;
|
|
if (!node.childNodes) {
|
|
node.childNodes = [];
|
|
}
|
|
|
|
if (c >= node.childNodes.length) {
|
|
node.childNodes.push(newNode);
|
|
} else {
|
|
node.childNodes.splice(c, 0, newNode);
|
|
}
|
|
if (node.nodeName === 'TEXTAREA') {
|
|
node.value = diff.newValue;
|
|
}
|
|
break;
|
|
default:
|
|
console.log('unknown action');
|
|
}
|
|
|
|
// capture newNode for the callback
|
|
info.newNode = newNode;
|
|
this.postVirtualDiffApply(info);
|
|
|
|
return;
|
|
},
|
|
|
|
|
|
|
|
|
|
// ===== Apply a diff =====
|
|
|
|
apply: function(tree, diffs) {
|
|
var dobj = this;
|
|
|
|
if (diffs.length === 0) {
|
|
return true;
|
|
}
|
|
diffs.forEach(function(diff) {
|
|
if (!dobj.applyDiff(tree, diff)) {
|
|
return false;
|
|
}
|
|
});
|
|
return true;
|
|
},
|
|
getFromRoute: function(tree, route) {
|
|
route = route.slice();
|
|
var c, node = tree;
|
|
while (route.length > 0) {
|
|
if (!node.childNodes) {
|
|
return false;
|
|
}
|
|
c = route.splice(0, 1)[0];
|
|
node = node.childNodes[c];
|
|
}
|
|
return node;
|
|
},
|
|
applyDiff: function(tree, diff) {
|
|
var node = this.getFromRoute(tree, diff.route),
|
|
newNode, reference, route, c;
|
|
|
|
// pre-diff hook
|
|
var info = {
|
|
diff: diff,
|
|
node: node
|
|
};
|
|
|
|
if (this.preDiffApply(info)) { return true; }
|
|
|
|
switch (diff.action) {
|
|
case 'addAttribute':
|
|
if (!node || !node.setAttribute) {
|
|
return false;
|
|
}
|
|
node.setAttribute(diff.name, diff.value);
|
|
break;
|
|
case 'modifyAttribute':
|
|
if (!node || !node.setAttribute) {
|
|
return false;
|
|
}
|
|
node.setAttribute(diff.name, diff.newValue);
|
|
break;
|
|
case 'removeAttribute':
|
|
if (!node || !node.removeAttribute) {
|
|
return false;
|
|
}
|
|
node.removeAttribute(diff.name);
|
|
break;
|
|
case 'modifyTextElement':
|
|
if (!node || node.nodeType !== 3) {
|
|
return false;
|
|
}
|
|
this.textDiff(node, node.data, diff.oldValue, diff.newValue);
|
|
break;
|
|
case 'modifyValue':
|
|
if (!node || typeof node.value === 'undefined') {
|
|
return false;
|
|
}
|
|
node.value = diff.newValue;
|
|
break;
|
|
case 'modifyComment':
|
|
if (!node || typeof node.data === 'undefined') {
|
|
return false;
|
|
}
|
|
this.textDiff(node, node.data, diff.oldValue, diff.newValue);
|
|
break;
|
|
case 'modifyChecked':
|
|
if (!node || typeof node.checked === 'undefined') {
|
|
return false;
|
|
}
|
|
node.checked = diff.newValue;
|
|
break;
|
|
case 'modifySelected':
|
|
if (!node || typeof node.selected === 'undefined') {
|
|
return false;
|
|
}
|
|
node.selected = diff.newValue;
|
|
break;
|
|
case 'replaceElement':
|
|
node.parentNode.replaceChild(this.objToNode(diff.newValue, node.namespaceURI === 'http://www.w3.org/2000/svg'), node);
|
|
break;
|
|
case 'relocateGroup':
|
|
Array.apply(null, new Array(diff.groupLength)).map(function() {
|
|
return node.removeChild(node.childNodes[diff.from]);
|
|
}).forEach(function(childNode, index) {
|
|
if (index === 0) {
|
|
reference = node.childNodes[diff.to];
|
|
}
|
|
node.insertBefore(childNode, reference);
|
|
});
|
|
break;
|
|
case 'removeElement':
|
|
node.parentNode.removeChild(node);
|
|
break;
|
|
case 'addElement':
|
|
route = diff.route.slice();
|
|
c = route.splice(route.length - 1, 1)[0];
|
|
node = this.getFromRoute(tree, route);
|
|
node.insertBefore(this.objToNode(diff.element, node.namespaceURI === 'http://www.w3.org/2000/svg'), node.childNodes[c]);
|
|
break;
|
|
case 'removeTextElement':
|
|
if (!node || node.nodeType !== 3) {
|
|
return false;
|
|
}
|
|
node.parentNode.removeChild(node);
|
|
break;
|
|
case 'addTextElement':
|
|
route = diff.route.slice();
|
|
c = route.splice(route.length - 1, 1)[0];
|
|
newNode = document.createTextNode(diff.value);
|
|
node = this.getFromRoute(tree, route);
|
|
if (!node || !node.childNodes) {
|
|
return false;
|
|
}
|
|
node.insertBefore(newNode, node.childNodes[c]);
|
|
break;
|
|
default:
|
|
console.log('unknown action');
|
|
}
|
|
|
|
// if a new node was created, we might be interested in it
|
|
// post diff hook
|
|
info.newNode = newNode;
|
|
this.postDiffApply(info);
|
|
|
|
return true;
|
|
},
|
|
|
|
// ===== Undo a diff =====
|
|
|
|
undo: function(tree, diffs) {
|
|
diffs = diffs.slice();
|
|
var dobj = this;
|
|
if (!diffs.length) {
|
|
diffs = [diffs];
|
|
}
|
|
diffs.reverse();
|
|
diffs.forEach(function(diff) {
|
|
dobj.undoDiff(tree, diff);
|
|
});
|
|
},
|
|
undoDiff: function(tree, diff) {
|
|
|
|
switch (diff.action) {
|
|
case 'addAttribute':
|
|
diff.action = 'removeAttribute';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifyAttribute':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'removeAttribute':
|
|
diff.action = 'addAttribute';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifyTextElement':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifyValue':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifyComment':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifyChecked':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'modifySelected':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'replaceElement':
|
|
swap(diff, 'oldValue', 'newValue');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'relocateGroup':
|
|
swap(diff, 'from', 'to');
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'removeElement':
|
|
diff.action = 'addElement';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'addElement':
|
|
diff.action = 'removeElement';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'removeTextElement':
|
|
diff.action = 'addTextElement';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
case 'addTextElement':
|
|
diff.action = 'removeTextElement';
|
|
this.applyDiff(tree, diff);
|
|
break;
|
|
default:
|
|
console.log('unknown action');
|
|
}
|
|
|
|
}
|
|
};
|
|
|
|
if (typeof exports !== 'undefined') {
|
|
if (typeof module !== 'undefined' && module.exports) {
|
|
exports = module.exports = diffDOM;
|
|
}
|
|
exports.diffDOM = diffDOM;
|
|
} else {
|
|
// `window` in the browser, or `exports` on the server
|
|
this.diffDOM = diffDOM;
|
|
}
|
|
|
|
}.call(this));
|