src/smartxml/smartxml.js

   1 define([
   2     'libs/jquery',
   3     'libs/underscore',
   4     'libs/backbone',
   5     'smartxml/events',
   6     'smartxml/transformations'
   7 ], function($, _, Backbone, events, transformations) {
   8
   9 'use strict';
  10 /* globals Node */
  11
  12 var TEXT_NODE = Node.TEXT_NODE;
  13
  14
  15 var INSERTION = function(implementation) {
  16     var toret = function(node) {
  17         var insertion = this.getNodeInsertion(node),
  18             nodeWasContained = this.document.containsNode(insertion.ofNode),
  19             nodeParent;
  20         if(!(this.document.containsNode(this))) {
  21             nodeParent = insertion.ofNode.parent();
  22         }
  23         implementation.call(this, insertion.ofNode.nativeNode);
  24         this.triggerChangeEvent(insertion.insertsNew ? 'nodeAdded' : 'nodeMoved', {node: insertion.ofNode}, nodeParent, nodeWasContained);
  25         return insertion.ofNode;
  26     };
  27     return toret;
  28 };
  29
  30 var DocumentNode = function(nativeNode, document) {
  31     if(!document) {
  32         throw new Error('undefined document for a node');
  33     }
  34     this.document = document;
  35     this._setNativeNode(nativeNode);
  36
  37 };
  38
  39 $.extend(DocumentNode.prototype, {
  40
  41     transform: function(name, args) {
  42         var Transformation = this.transformations.get(name),
  43             transformation;
  44         if(Transformation) {
  45             transformation = new Transformation(this.document, this, args);
  46         }
  47         return this.document.transform(transformation);
  48     },
  49
  50     _setNativeNode: function(nativeNode) {
  51         this.nativeNode = nativeNode;
  52         this._$ = $(nativeNode);
  53     },
  54
  55     clone: function() {
  56         var clone = this._$.clone(true, true);
  57         // clone.find('*').addBack().each(function() {
  58         //     var n = $(this);
  59         //     if(n.data('canvasElement')) {
  60         //         n.data('canvasElement', $.extend(true, {}, n.data('canvasElement')));
  61         //         n.data('canvasElement').$element = n.data('canvasElement').$element.clone(true, true);
  62         //     }
  63         // });
  64         return this.document.createDocumentNode(clone[0]);
  65     },
  66
  67     getPath: function(ancestor) {
  68         var nodePath = [this].concat(this.parents()),
  69             toret, idx;
  70         ancestor = ancestor || this.document.root;
  71
  72         nodePath.some(function(node, i) {
  73             if(node.sameNode(ancestor)) {
  74                 idx = i;
  75                 return true;
  76             }
  77         });
  78
  79         if(idx !== 'undefined') {
  80             nodePath = nodePath.slice(0, idx);
  81         }
  82         toret = nodePath.map(function(node) {return node.getIndex(); });
  83         toret.reverse();
  84         return toret;
  85     },
  86
  87     isRoot: function() {
  88         return this.document.root.sameNode(this);
  89     },
  90
  91     detach: function() {
  92         var parent = this.parent();
  93         this._$.detach();
  94         this.triggerChangeEvent('nodeDetached', {parent: parent});
  95         return this;
  96     },
  97
  98     replaceWith: function(node) {
  99         var toret;
 100         if(this.isRoot()) {
 101             return this.document.replaceRoot(node);
 102         }
 103         toret = this.after(node);
 104         this.detach();
 105         return toret;
 106     },
 107
 108     sameNode: function(otherNode) {
 109         return !!(otherNode) && this.nativeNode === otherNode.nativeNode;
 110     },
 111
 112     parent: function() {
 113         var parentNode = this.nativeNode.parentNode;
 114         if(parentNode && parentNode.nodeType === Node.ELEMENT_NODE) {
 115             return this.document.createDocumentNode(parentNode);
 116         }
 117         return null;
 118     },
 119
 120     parents: function() {
 121         var parent = this.parent(),
 122             parents = parent ? parent.parents() : [];
 123         if(parent) {
 124             parents.unshift(parent);
 125         }
 126         return parents;
 127     },
 128
 129     prev: function() {
 130         var myIdx = this.getIndex();
 131         return myIdx > 0 ? this.parent().contents()[myIdx-1] : null;
 132     },
 133
 134     next: function() {
 135         if(this.isRoot()) {
 136             return null;
 137         }
 138         var myIdx = this.getIndex(),
 139             parentContents = this.parent().contents();
 140         return myIdx < parentContents.length - 1 ? parentContents[myIdx+1] : null;
 141     },
 142
 143     isSurroundedByTextElements: function() {
 144         var prev = this.prev(),
 145             next = this.next();
 146         return prev && (prev.nodeType === Node.TEXT_NODE) && next && (next.nodeType === Node.TEXT_NODE);
 147     },
 148
 149     after: INSERTION(function(nativeNode) {
 150         return this._$.after(nativeNode);
 151     }),
 152
 153     before: INSERTION(function(nativeNode) {
 154         return this._$.before(nativeNode);
 155     }),
 156
 157     wrapWith: function(node) {
 158         var insertion = this.getNodeInsertion(node);
 159         if(this.parent()) {
 160             this.before(insertion.ofNode);
 161         }
 162         insertion.ofNode.append(this);
 163         return insertion.ofNode;
 164     },
 165
 166     /**
 167     * Removes parent of a node if node has no siblings.
 168     */
 169     unwrap: function() {
 170         if(this.isRoot()) {
 171             return;
 172         }
 173         var parent = this.parent(),
 174             grandParent;
 175         if(parent.contents().length === 1) {
 176             grandParent = parent.parent();
 177             parent.unwrapContent();
 178             return grandParent;
 179         }
 180     },
 181
 182     triggerChangeEvent: function(type, metaData, origParent, nodeWasContained) {
 183         var node = (metaData && metaData.node) ? metaData.node : this,
 184             event = new events.ChangeEvent(type, $.extend({node: node}, metaData || {}));
 185         if(type === 'nodeDetached' || this.document.containsNode(event.meta.node)) {
 186             this.document.trigger('change', event);
 187         }
 188         if((type === 'nodeAdded' || type === 'nodeMoved') && !this.document.containsNode(this) && nodeWasContained) {
 189              event = new events.ChangeEvent('nodeDetached', {node: node, parent: origParent});
 190              this.document.trigger('change', event);
 191         }
 192     },
 193
 194     getNodeInsertion: function(node) {
 195         return this.document.getNodeInsertion(node);
 196     },
 197
 198     getIndex: function() {
 199         if(this.isRoot()) {
 200             return 0;
 201         }
 202         return this.parent().indexOf(this);
 203     }
 204 });
 205
 206 var ElementNode = function(nativeNode, document) {
 207     DocumentNode.call(this, nativeNode, document);
 208 };
 209 ElementNode.prototype = Object.create(DocumentNode.prototype);
 210
 211 $.extend(ElementNode.prototype, {
 212     nodeType: Node.ELEMENT_NODE,
 213
 214     detach: function() {
 215         var next;
 216         if(this.parent() && this.isSurroundedByTextElements()) {
 217             next = this.next();
 218             this.prev().appendText(next.getText());
 219             next.detach();
 220         }
 221         return DocumentNode.prototype.detach.call(this);
 222     },
 223
 224     setData: function(key, value) {
 225         if(value !== undefined) {
 226             this._$.data(key, value);
 227         } else {
 228             this._$.removeData(_.keys(this._$.data()));
 229             this._$.data(key);
 230         }
 231     },
 232
 233     getData: function(key) {
 234         if(key) {
 235             return this._$.data(key);
 236         }
 237         return this._$.data();
 238     },
 239
 240     getTagName: function() {
 241         return this.nativeNode.tagName.toLowerCase();
 242     },
 243
 244     contents: function(selector) {
 245         var toret = [],
 246             document = this.document;
 247         if(selector) {
 248             this._$.children(selector).each(function() {
 249                 toret.push(document.createDocumentNode(this));
 250             });
 251         } else {
 252             this._$.contents().each(function() {
 253                 toret.push(document.createDocumentNode(this));
 254             });
 255         }
 256         return toret;
 257     },
 258
 259     indexOf: function(node) {
 260         return this._$.contents().index(node._$);
 261     },
 262
 263     setTag: function(tagName) {
 264         var node = this.document.createDocumentNode({tagName: tagName}),
 265             oldTagName = this.getTagName(),
 266             myContents = this._$.contents();
 267
 268         this.getAttrs().forEach(function(attribute) {
 269             node.setAttr(attribute.name, attribute.value, true);
 270         });
 271         node.setData(this.getData());
 272
 273         if(this.sameNode(this.document.root)) {
 274             defineDocumentProperties(this.document, node._$);
 275         }
 276         this._$.replaceWith(node._$);
 277         this._setNativeNode(node._$[0]);
 278         this._$.append(myContents);
 279         this.triggerChangeEvent('nodeTagChange', {oldTagName: oldTagName, newTagName: this.getTagName()});
 280     },
 281
 282     getAttr: function(name) {
 283         return this._$.attr(name);
 284     },
 285
 286     setAttr: function(name, value, silent) {
 287         var oldVal = this.getAttr(name);
 288         this._$.attr(name, value);
 289         if(!silent) {
 290             this.triggerChangeEvent('nodeAttrChange', {attr: name, oldVal: oldVal, newVal: value});
 291         }
 292     },
 293
 294     getAttrs: function() {
 295         var toret = [];
 296         for(var i = 0; i < this.nativeNode.attributes.length; i++) {
 297             toret.push(this.nativeNode.attributes[i]);
 298         }
 299         return toret;
 300     },
 301
 302     append: INSERTION(function(nativeNode) {
 303         this._$.append(nativeNode);
 304     }),
 305
 306     prepend: INSERTION(function(nativeNode) {
 307         this._$.prepend(nativeNode);
 308     }),
 309
 310     insertAtIndex: function(nativeNode, index) {
 311         var contents = this.contents();
 312         if(index < contents.length) {
 313             return contents[index].before(nativeNode);
 314         } else if(index === contents.length) {
 315             return this.append(nativeNode);
 316         }
 317     },
 318
 319     unwrapContent: function() {
 320         var parent = this.parent();
 321         if(!parent) {
 322             return;
 323         }
 324
 325         var myContents = this.contents(),
 326             myIdx = parent.indexOf(this);
 327
 328
 329         if(myContents.length === 0) {
 330             return this.detach();
 331         }
 332
 333         var prev = this.prev(),
 334             next = this.next(),
 335             moveLeftRange, moveRightRange, leftMerged;
 336
 337         if(prev && (prev.nodeType === TEXT_NODE) && (myContents[0].nodeType === TEXT_NODE)) {
 338             prev.appendText(myContents[0].getText());
 339             myContents[0].detach();
 340             moveLeftRange = true;
 341             leftMerged = true;
 342         } else {
 343             leftMerged = false;
 344         }
 345
 346         if(!(leftMerged && myContents.length === 1)) {
 347             var lastContents = _.last(myContents);
 348             if(next && (next.nodeType === TEXT_NODE) && (lastContents.nodeType === TEXT_NODE)) {
 349                 next.prependText(lastContents.getText());
 350                 lastContents.detach();
 351                 moveRightRange = true;
 352             }
 353         }
 354
 355         var childrenLength = this.contents().length;
 356         this.contents().forEach(function(child) {
 357             this.before(child);
 358         }.bind(this));
 359
 360         this.detach();
 361
 362         return {
 363             element1: parent.contents()[myIdx + (moveLeftRange ? -1 : 0)],
 364             element2: parent.contents()[myIdx + childrenLength-1 + (moveRightRange ? 1 : 0)]
 365         };
 366     },
 367
 368     wrapText: function(params) {
 369         return this.document._wrapText(_.extend({inside: this}, params));
 370     },
 371
 372     toXML: function() {
 373         var wrapper = $('<div>');
 374         wrapper.append(this._getXMLDOMToDump());
 375         return wrapper.html();
 376     },
 377
 378     _getXMLDOMToDump: function() {
 379         return this._$;
 380     }
 381 });
 382
 383 // trans
 384
 385 // todo - split+append
 386
 387 // ElementNode.prototype.transformations.register(transformations.createContextTransformation({
 388 //     name: 'smartxml.setAttr',
 389 //     impl: function(args) {
 390 //         this.setAttr(args.name, args.value);
 391 //     },
 392 //     getChangeRoot: function() {
 393 //         return this.context;
 394 //     }
 395 // }));
 396
 397 // ElementNode.prototype.transformations.register(transformations.createContextTransformation({
 398 //     name: 'smartxml.setAttr2',
 399 //     impl: function(args) {
 400 //         this.prevAttr = this.getAttr(args.name);
 401 //         this.setAttr(args.name, args.value);
 402 //     },
 403 //     undo: function(args) {
 404 //         this.setAttr(args.name, this.prevAttr);
 405 //     }
 406 // }));
 407
 408 // DocumentNode.prototype.transformations.register(transformations.createContextTransformation({
 409 //     name: 'smartxml.wrapWith',
 410 //     getChangeRoot: function() {
 411 //         return this.context.parent();
 412 //     },
 413 //     impl: function(args) {
 414 //         return this.wrapWith(args);
 415 //     }
 416 // }));
 417
 418 // DocumentNode.prototype.transformations.register(transformations.createContextTransformation({
 419 //     name: 'smartxml.wrapText',
 420 //     getChangeRoot: function() {
 421 //         return this.context;
 422 //     },
 423 //     impl: function(args) {
 424 //         return this.wrapText(args);
 425 //     }
 426 // }));
 427
 428 // DocumentNode.prototype.transformations.register(transformations.createContextTransformation({
 429 //     name: 'smartxml.detach',
 430 //     getChangeRoot: function() {
 431 //         return this.context.parent();
 432 //     },
 433 //     impl: function(args) {
 434 //         return this.detach();
 435 //     }
 436 // }));
 437
 438 ///
 439
 440 var TextNode = function(nativeNode, document) {
 441     DocumentNode.call(this, nativeNode, document);
 442 };
 443 TextNode.prototype = Object.create(DocumentNode.prototype);
 444
 445 $.extend(TextNode.prototype, {
 446     nodeType: Node.TEXT_NODE,
 447
 448     getText: function() {
 449         return this.nativeNode.data;
 450     },
 451
 452     setText: function(text) {
 453         //console.log('smartxml: ' + text);
 454         this.nativeNode.data = text;
 455         this.triggerTextChangeEvent();
 456     },
 457
 458     appendText: function(text) {
 459         this.nativeNode.data = this.nativeNode.data + text;
 460         this.triggerTextChangeEvent();
 461     },
 462
 463     prependText: function(text) {
 464         this.nativeNode.data = text + this.nativeNode.data;
 465         this.triggerTextChangeEvent();
 466     },
 467
 468     wrapWith: function(desc) {
 469         if(typeof desc.start === 'number' && typeof desc.end === 'number') {
 470             return this.document._wrapText({
 471                 inside: this.parent(),
 472                 textNodeIdx: this.parent().indexOf(this),
 473                 offsetStart: Math.min(desc.start, desc.end),
 474                 offsetEnd: Math.max(desc.start, desc.end),
 475                 _with: {tagName: desc.tagName, attrs: desc.attrs}
 476             });
 477         } else {
 478             return DocumentNode.prototype.wrapWith.call(this, desc);
 479         }
 480     },
 481
 482     split: function(params) {
 483         var parentElement = this.parent(),
 484             passed = false,
 485             succeedingChildren = [],
 486             prefix = this.getText().substr(0, params.offset),
 487             suffix = this.getText().substr(params.offset);
 488
 489         parentElement.contents().forEach(function(child) {
 490             if(passed) {
 491                 succeedingChildren.push(child);
 492             }
 493             if(child.sameNode(this)) {
 494                 passed = true;
 495             }
 496         }.bind(this));
 497
 498         if(prefix.length > 0) {
 499             this.setText(prefix);
 500         }
 501         else {
 502             this.detach();
 503         }
 504
 505         var attrs = {};
 506         parentElement.getAttrs().forEach(function(attr) {attrs[attr.name] = attr.value; });
 507         var newElement = this.document.createDocumentNode({tagName: parentElement.getTagName(), attrs: attrs});
 508         parentElement.after(newElement);
 509
 510         if(suffix.length > 0) {
 511             newElement.append({text: suffix});
 512         }
 513         succeedingChildren.forEach(function(child) {
 514             newElement.append(child);
 515         });
 516
 517         return {first: parentElement, second: newElement};
 518     },
 519
 520     triggerTextChangeEvent: function() {
 521         var event = new events.ChangeEvent('nodeTextChange', {node: this});
 522         this.document.trigger('change', event);
 523     }
 524 });
 525
 526
 527 // TextNode.prototype.transformations.register(transformations.createContextTransformation({
 528 //     name: 'rng.breakContent',
 529 //     // impl: function(args) {
 530 //     //     var node = this.context,
 531 //     //         newNodes, emptyNode, emptyText;
 532 //     //     newNodes = node.transform('smartxml.split', {offset: args.offset});
 533 //     //     [newNodes.first, newNodes.second].some(function(newNode) {
 534 //     //         if(!(newNode.contents().length)) {
 535 //     //             newNode.transform('smartxml.append', {text: ''});
 536 //     //             return true; // break
 537 //     //         }
 538 //     //     });
 539 //     //     return _.extend(newNodes, {emptyText: emptyText});
 540 //     // },
 541 //     impl: function(args) {
 542 //         var node = this,
 543 //             newNodes, emptyNode, emptyText;
 544 //         newNodes = node.split({offset: args.offset});
 545 //         [newNodes.first, newNodes.second].some(function(newNode) {
 546 //             if(!(newNode.contents().length)) {
 547 //                 newNode.append({text: ''});
 548 //                 return true; // break
 549 //             }
 550 //         });
 551 //         return _.extend(newNodes, {emptyText: emptyText});
 552 //     },
 553 //     getChangeRoot: function() {
 554 //         return this.context.parent().parent();
 555 //     },
 556 //     isAllowed: function(args) {
 557 //         var parent = this.parent();
 558 //         return !!(parent && parent.parent());
 559 //     }
 560 // }));
 561
 562
 563 // ElementNode.prototype.transformations.register(transformations.createContextTransformation({
 564 //     name: 'smartxml.setText',
 565 //     impl: function(args) {
 566 //         this.setText(args.text);
 567 //     },
 568 //     getChangeRoot: function() {
 569 //         return this.context;
 570 //     }
 571 // }));
 572
 573
 574 var parseXML = function(xml) {
 575     return $($.trim(xml))[0];
 576 };
 577
 578 var registerTransformation = function(desc, name, target) {
 579     var Transformation = transformations.createContextTransformation(desc, name);
 580     target.register(Transformation);
 581 };
 582
 583 var registerMethod = function(methodName, method, target) {
 584     if(target[methodName]) {
 585         throw new Error('Cannot extend {target} with method name {methodName}. Name already exists.'
 586             .replace('{target}', target)
 587             .replace('{methodName}', methodName)
 588         );
 589     }
 590     target[methodName] = method;
 591 };
 592
 593
 594 var Document = function(xml) {
 595     this.loadXML(xml);
 596     this.undoStack = [];
 597     this.redoStack = [];
 598     this._transformationLevel = 0;
 599     this.transformations = new transformations.TransformationStorage();
 600
 601     this._nodeMethods = {};
 602     this._nodeTransformations = new transformations.TransformationStorage();
 603 };
 604
 605 $.extend(Document.prototype, Backbone.Events, {
 606     ElementNodeFactory: ElementNode,
 607     TextNodeFactory: TextNode,
 608
 609     createDocumentNode: function(from) {
 610         if(!(from instanceof Node)) {
 611             if(from.text !== undefined) {
 612                 /* globals document */
 613                 from = document.createTextNode(from.text);
 614             } else {
 615                 var node = $('<' + from.tagName + '>');
 616
 617                 _.keys(from.attrs || {}).forEach(function(key) {
 618                     node.attr(key, from.attrs[key]);
 619                 });
 620
 621                 from = node[0];
 622             }
 623         }
 624         var Factory;
 625         if(from.nodeType === Node.TEXT_NODE) {
 626             Factory = this.TextNodeFactory;
 627         } else if(from.nodeType === Node.ELEMENT_NODE) {
 628             Factory = this.ElementNodeFactory;
 629         }
 630         var toret = new Factory(from, this);
 631         _.extend(toret, this._nodeMethods);
 632         toret.transformations = this._nodeTransformations;
 633         return toret;
 634     },
 635
 636     loadXML: function(xml, options) {
 637         options = options || {};
 638         defineDocumentProperties(this, $(parseXML(xml)));
 639         if(!options.silent) {
 640             this.trigger('contentSet');
 641         }
 642     },
 643
 644     toXML: function() {
 645         return this.root.toXML();
 646     },
 647
 648     containsNode: function(node) {
 649         return this.root && (node.nativeNode === this.root.nativeNode || node._$.parents().index(this.root._$) !== -1);
 650     },
 651
 652     wrapNodes: function(params) {
 653         if(!(params.node1.parent().sameNode(params.node2.parent()))) {
 654             throw new Error('Wrapping non-sibling nodes not supported.');
 655         }
 656
 657         var parent = params.node1.parent(),
 658             parentContents = parent.contents(),
 659             wrapper = this.createDocumentNode({
 660                 tagName: params._with.tagName,
 661                 attrs: params._with.attrs}),
 662             idx1 = parent.indexOf(params.node1),
 663             idx2 = parent.indexOf(params.node2);
 664
 665         if(idx1 > idx2) {
 666             var tmp = idx1;
 667             idx1 = idx2;
 668             idx2 = tmp;
 669         }
 670
 671         var insertingMethod, insertingTarget;
 672         if(idx1 === 0) {
 673             insertingMethod = 'prepend';
 674             insertingTarget = parent;
 675         } else {
 676             insertingMethod = 'after';
 677             insertingTarget = parentContents[idx1-1];
 678         }
 679
 680         for(var i = idx1; i <= idx2; i++) {
 681             wrapper.append(parentContents[i].detach());
 682         }
 683
 684         insertingTarget[insertingMethod](wrapper);
 685         return wrapper;
 686     },
 687
 688     getSiblingParents: function(params) {
 689         var parents1 = [params.node1].concat(params.node1.parents()).reverse(),
 690             parents2 = [params.node2].concat(params.node2.parents()).reverse(),
 691             noSiblingParents = null;
 692
 693         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0]))) {
 694             return noSiblingParents;
 695         }
 696
 697         var i;
 698         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 699             if(parents1[i].sameNode(parents2[i])) {
 700                 continue;
 701             }
 702             break;
 703         }
 704         return {node1: parents1[i], node2: parents2[i]};
 705     },
 706
 707     _wrapText: function(params) {
 708         params = _.extend({textNodeIdx: 0}, params);
 709         if(typeof params.textNodeIdx === 'number') {
 710             params.textNodeIdx = [params.textNodeIdx];
 711         }
 712
 713         var contentsInside = params.inside.contents(),
 714             idx1 = Math.min.apply(Math, params.textNodeIdx),
 715             idx2 = Math.max.apply(Math, params.textNodeIdx),
 716             textNode1 = contentsInside[idx1],
 717             textNode2 = contentsInside[idx2],
 718             sameNode = textNode1.sameNode(textNode2),
 719             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 720             prefixInside = textNode1.getText().substr(params.offsetStart),
 721             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 722             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 723         ;
 724
 725         if(!(textNode1.parent().sameNode(textNode2.parent()))) {
 726             throw new Error('Wrapping text in non-sibling text nodes not supported.');
 727         }
 728
 729         var wrapperElement = this.createDocumentNode({tagName: params._with.tagName, attrs: params._with.attrs});
 730         textNode1.after(wrapperElement);
 731         textNode1.detach();
 732
 733         if(prefixOutside.length > 0) {
 734             wrapperElement.before({text:prefixOutside});
 735         }
 736         if(sameNode) {
 737             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 738             wrapperElement.append({text: core});
 739         } else {
 740             textNode2.detach();
 741             if(prefixInside.length > 0) {
 742                 wrapperElement.append({text: prefixInside});
 743             }
 744             for(var i = idx1 + 1; i < idx2; i++) {
 745                 wrapperElement.append(contentsInside[i]);
 746             }
 747             if(suffixInside.length > 0) {
 748                 wrapperElement.append({text: suffixInside});
 749             }
 750         }
 751         if(suffixOutside.length > 0) {
 752             wrapperElement.after({text: suffixOutside});
 753         }
 754         return wrapperElement;
 755     },
 756
 757     trigger: function() {
 758         //console.log('trigger: ' + arguments[0] + (arguments[1] ? ', ' + arguments[1].type : ''));
 759         Backbone.Events.trigger.apply(this, arguments);
 760     },
 761
 762     getNodeInsertion: function(node) {
 763         var insertion = {};
 764         if(node instanceof DocumentNode) {
 765             insertion.ofNode = node;
 766             insertion.insertsNew = !this.containsNode(node);
 767         } else {
 768           insertion.ofNode = this.createDocumentNode(node);
 769           insertion.insertsNew = true;
 770         }
 771         return insertion;
 772     },
 773
 774     replaceRoot: function(node) {
 775         var insertion = this.getNodeInsertion(node);
 776         this.root.detach();
 777         defineDocumentProperties(this, insertion.ofNode._$);
 778         insertion.ofNode.triggerChangeEvent('nodeAdded');
 779         return insertion.ofNode;
 780     },
 781
 782     registerMethod: function(methodName, method) {
 783         registerMethod(methodName, method, this);
 784     },
 785
 786     registerNodeMethod: function(methodName, method) {
 787         registerMethod(methodName, method, this._nodeMethods);
 788     },
 789
 790     registerDocumentTransformation: function(desc, name) {
 791         registerTransformation(desc, name, this.transformations);
 792     },
 793
 794     registerNodeTransformation: function(desc, name) {
 795         registerTransformation(desc, name, this._nodeTransformations);
 796     },
 797
 798     registerExtension: function(extension) {
 799         //debugger;
 800         var doc = this,
 801             existingPropertyNames = _.values(this);
 802
 803         ['document', 'documentNode'].forEach(function(dstName) {
 804             var dstExtension = extension[dstName];
 805             if(dstExtension) {
 806                 if(dstExtension.methods) {
 807                     _.pairs(dstExtension.methods).forEach(function(pair) {
 808                         var methodName = pair[0],
 809                             method = pair[1],
 810                             operation;
 811                         operation = {document: 'registerMethod', documentNode: 'registerNodeMethod'}[dstName];
 812                         doc[operation](methodName, method);
 813
 814                     });
 815                 }
 816
 817                 if(dstExtension.transformations) {
 818                     _.pairs(dstExtension.transformations).forEach(function(pair) {
 819                         var name = pair[0],
 820                             desc = pair[1],
 821                             operation;
 822                         operation = {document: 'registerDocumentTransformation', documentNode: 'registerNodeTransformation'}[dstName];
 823                         doc[operation](desc, name);
 824                     });
 825                 }
 826             }
 827         });
 828     },
 829
 830     transform: function(transformation, args) {
 831         //console.log('transform');
 832         var Transformation, toret;
 833         if(typeof transformation === 'string') {
 834             Transformation = this.transformations.get(transformation);
 835             if(Transformation) {
 836                 transformation = new Transformation(this, this, args);
 837             }
 838         }
 839         if(transformation) {
 840             this._transformationLevel++;
 841             toret = transformation.run();
 842             if(this._transformationLevel === 1) {
 843                 this.undoStack.push(transformation);
 844             }
 845             this._transformationLevel--;
 846             //console.log('clearing redo stack');
 847             this.redoStack = [];
 848             return toret;
 849         } else {
 850             throw new Error('Transformation ' + transformation + ' doesn\'t exist!');
 851         }
 852     },
 853     undo: function() {
 854         var transformation = this.undoStack.pop();
 855         if(transformation) {
 856             transformation.undo();
 857             this.redoStack.push(transformation);
 858         }
 859     },
 860     redo: function() {
 861         var transformation = this.redoStack.pop();
 862         if(transformation) {
 863             transformation.run();
 864             this.undoStack.push(transformation);
 865         }
 866     },
 867
 868     getNodeByPath: function(path) {
 869         var toret = this.root;
 870         path.forEach(function(idx) {
 871             toret = toret.contents()[idx];
 872         });
 873         return toret;
 874     }
 875 });
 876
 877 var defineDocumentProperties = function(doc, $document) {
 878     Object.defineProperty(doc, 'root', {get: function() {
 879         return doc.createDocumentNode($document[0]);
 880     }, configurable: true});
 881     Object.defineProperty(doc, 'dom', {get: function() {
 882         return $document[0];
 883     }, configurable: true});
 884 };
 885
 886 // Document.prototype.transformations.register(transformations.createContextTransformation({
 887 //     name: 'smartxml.wrapNodes',
 888 //     // init: function() {
 889
 890 //     // },
 891 //     // getChangeRoot: function() {
 892 //     //     return this.context;
 893 //     // },
 894 //     impl: function(args) {
 895 //         this.wrapNodes(args);
 896 //     },
 897
 898 // }));
 899
 900
 901 return {
 902     documentFromXML: function(xml) {
 903         return new Document(xml);
 904     },
 905
 906     elementNodeFromXML: function(xml) {
 907         return this.documentFromXML(xml).root;
 908     },
 909
 910     Document: Document,
 911     DocumentNode: DocumentNode,
 912     ElementNode: ElementNode,
 913     TextNode: TextNode
 914 };
 915
 916 });