src/smartxml/core.js

   1 define(function(require) {
   2
   3 'use strict';
   4 /* globals Node */
   5
   6 var _ = require('libs/underscore');
   7
   8
   9 var INSERTION = function(implementation) {
  10     var toret = function(node, options) {
  11         var insertion = this.getNodeInsertion(node),
  12             nodeWasContained = this.document.containsNode(insertion.ofNode),
  13             nodeParent,
  14             returned;
  15         options = options || {};
  16         if(!(this.document.containsNode(this)) || !insertion.insertsNew) {
  17             nodeParent = insertion.ofNode.parent();
  18         }
  19         if(!insertion.insertsNew && insertion.ofNode.isSurroundedByTextNodes()) {
  20             var prev = insertion.ofNode.prev(),
  21                 next = insertion.ofNode.next();
  22             prev.setText(prev.getText()+next.getText());
  23             next.detach();
  24         }
  25         returned = implementation.call(this, insertion.ofNode);
  26         if(!options.silent && returned && returned.sameNode(insertion.ofNode)) {
  27             if(!insertion.insertsNew) {
  28                 this.triggerChangeEvent('nodeDetached', {node: insertion.ofNode, parent: nodeParent, move: true});
  29             }
  30             this.triggerChangeEvent('nodeAdded', {node: insertion.ofNode, move: !insertion.insertsNew}, nodeParent, nodeWasContained);
  31         }
  32         return returned;
  33     };
  34     return toret;
  35 };
  36
  37 var documentNodeTransformations = {
  38     detach: function() {
  39         var parent = this.parent(),
  40             existed = this.document.containsNode(this);
  41         this._$.detach();
  42         if(existed) {
  43             this.triggerChangeEvent('nodeDetached', {parent: parent});
  44             if(!parent) {
  45                 // This was the root of the document
  46                 this.document._defineDocumentProperties(null);
  47             }
  48         }
  49         return this;
  50     },
  51
  52     replaceWith: function(node) {
  53         var toret;
  54         if(this.isRoot()) {
  55             return this.document.replaceRoot(node);
  56         }
  57         if(this.parent()) {
  58             toret = this.after(node);
  59             this.detach();
  60             return toret;
  61         }
  62         throw new Error('Cannot replace node without a parent.');
  63     },
  64
  65     after: INSERTION(function(node) {
  66         if(this.isRoot()) {
  67             return;
  68         }
  69         var next = this.next();
  70
  71         if(next && next.nodeType === Node.TEXT_NODE && node.nodeType === Node.TEXT_NODE) {
  72             next.setText(node.getText() + next.getText());
  73             node.detach();
  74             return next;
  75         }
  76         this._$.after(node.nativeNode);
  77         return node;
  78     }),
  79
  80     before: INSERTION(function(node) {
  81         if(this.isRoot()) {
  82             return;
  83         }
  84         var prev = this.prev();
  85         if(prev && prev.nodeType === Node.TEXT_NODE && node.nodeType === Node.TEXT_NODE) {
  86             prev.setText(prev.getText() + node.getText());
  87             node.detach();
  88             return prev;
  89         }
  90         this._$.before(node.nativeNode);
  91         return node;
  92     }),
  93
  94     wrapWith: function(node) {
  95         var insertion = this.getNodeInsertion(node);
  96
  97         if(this.parent() || this.isRoot()) {
  98             this.replaceWith(insertion.ofNode);
  99         }
 100         insertion.ofNode.append(this);
 101         return insertion.ofNode;
 102     },
 103
 104     /**
 105     * Removes parent of a node if node has no siblings.
 106     */
 107     unwrap: function() {
 108         if(this.isRoot()) {
 109             return;
 110         }
 111         var parent = this.parent(),
 112             grandParent;
 113         if(parent.contents().length === 1) {
 114             grandParent = parent.parent();
 115             parent.unwrapContent();
 116             return grandParent;
 117         }
 118     }
 119 };
 120
 121 var elementNodeTransformations = {
 122
 123     detach: function(params) {
 124         var next, prev;
 125
 126         params = params || {};
 127
 128         if(!params.normalizeStrategy) {
 129             params.normalizeStrategy = 'merge';
 130         }
 131
 132         if(this.parent() && this.isSurroundedByTextNodes()) {
 133             if(params.normalizeStrategy === 'detach-left') {
 134                 this.prev().detach();
 135             } else if(params.normalizeStrategy === 'detach-right') {
 136                 this.next().detach();
 137             } else if(params.normalizeStrategy === 'merge') {
 138                 next = this.next();
 139                 prev = this.prev();
 140                 params.ret = {
 141                     mergedTo: prev,
 142                     previousLen: prev.getText().length
 143                 };
 144                 prev.appendText(next.getText());
 145                 next.detach();
 146             } else {
 147                 throw new Error('unknown normalize strategy for detach');
 148             }
 149         }
 150         return this.__super__.detach();
 151     },
 152
 153     setTag: function(tagName) {
 154         var node = this.document.createDocumentNode({tagName: tagName});
 155
 156         this.getAttrs().forEach(function(attribute) {
 157             node.setAttr(attribute.name, attribute.value);
 158         });
 159
 160         this.contents().forEach(function(child) {
 161             node.append(child);
 162         });
 163
 164         node.setData(this.getData());
 165
 166         this.replaceWith(node);
 167         return node;
 168     },
 169
 170     setAttr: function(name, value, silent) {
 171         var oldVal = this.getAttr(name);
 172         this._$.attr(name, value);
 173         if(!silent) {
 174             this.triggerChangeEvent('nodeAttrChange', {attr: name, oldVal: oldVal, newVal: value});
 175         }
 176     },
 177
 178     append: INSERTION(function(node) {
 179         var last = _.last(this.contents());
 180         if(last && last.nodeType === Node.TEXT_NODE && node.nodeType === Node.TEXT_NODE) {
 181             last.setText(last.getText() + node.getText());
 182             node.detach();
 183             return last;
 184         } else {
 185             this._$.append(node.nativeNode);
 186             return node;
 187         }
 188     }),
 189
 190     prepend: INSERTION(function(node) {
 191         var first = this.contents()[0];
 192         if(first && first.nodeType === Node.TEXT_NODE && node.nodeType === Node.TEXT_NODE) {
 193             first.setText(node.getText() + first.getText());
 194             node.detach();
 195             return first;
 196         } else {
 197             this._$.prepend(node.nativeNode);
 198             return node;
 199         }
 200     }),
 201
 202     insertAtIndex: function(nativeNode, index) {
 203         var contents = this.contents();
 204         if(index < contents.length) {
 205             return contents[index].before(nativeNode);
 206         } else if(index === contents.length) {
 207             return this.append(nativeNode);
 208         }
 209     },
 210
 211     unwrapContent: function() {
 212         var parent = this.parent();
 213         if(!parent) {
 214             return;
 215         }
 216
 217         this.contents()
 218             .filter(function(child) {
 219                 return child.getProperty('describesParent');
 220             }.bind(this))
 221             .forEach(function(child) {
 222                 child.detach();
 223             });
 224
 225         var myContents = this.contents(),
 226             myIdx = parent.indexOf(this);
 227
 228         if(myContents.length === 0) {
 229             return this.detach();
 230         }
 231
 232         var childrenLength = this.contents().length,
 233             first = true,
 234             shiftRange = false;
 235         this.contents().forEach(function(child) {
 236             var returned = this.before(child);
 237             if(first && !(returned.sameNode(child))) {
 238                 shiftRange = true;
 239                 first = false;
 240             }
 241         }.bind(this));
 242
 243         this.detach();
 244
 245         return {
 246             element1: parent.contents()[myIdx + (shiftRange ? -1 : 0)],
 247             element2: parent.contents()[myIdx + childrenLength-1 + (shiftRange ? -1 : 0)]
 248         };
 249     },
 250
 251     wrapText: function(params) {
 252         return this.document._wrapText(_.extend({inside: this}, params));
 253     }
 254 };
 255
 256 var textNodeTransformations = {
 257     setText: {
 258         impl: function(t, text) {
 259             t.oldText = this.getText();
 260             this.nativeNode.data = text;
 261             this.triggerTextChangeEvent();
 262         },
 263         undo: function(t) {
 264             this.setText(t.oldText);
 265         }
 266     },
 267
 268     before: INSERTION(function(node) {
 269         if(node.nodeType === Node.TEXT_NODE) {
 270             this.prependText(node.getText());
 271             node.detach();
 272             return this;
 273         } else {
 274             return this.__super__.before(node, {silent:true});
 275         }
 276     }),
 277
 278     after: INSERTION(function(node) {
 279         if(node.nodeType === Node.TEXT_NODE) {
 280             this.appendText(node.getText());
 281             node.detach();
 282             return this;
 283         } else {
 284             return this.__super__.after(node, {silent:true});
 285         }
 286     }),
 287
 288     append: function(node) {
 289         if(node.nodeType === Node.TEXT_NODE) {
 290             this.appendText(node.getText());
 291             node.detach();
 292             return this;
 293         }
 294     },
 295     prepend: function(node) {
 296         if(node.nodeType === Node.TEXT_NODE) {
 297             this.prependText(node.getText());
 298             node.detach();
 299             return this;
 300         }
 301     },
 302
 303     appendText: function(text) {
 304         this.nativeNode.data = this.nativeNode.data + text;
 305         this.triggerTextChangeEvent();
 306     },
 307
 308     prependText: function(text) {
 309         this.nativeNode.data = text + this.nativeNode.data;
 310         this.triggerTextChangeEvent();
 311     },
 312
 313     wrapWith: function(desc) {
 314         if(typeof desc.start === 'number' && typeof desc.end === 'number') {
 315             return this.document._wrapText({
 316                 inside: this.parent(),
 317                 textNodeIdx: this.parent().indexOf(this),
 318                 offsetStart: Math.min(desc.start, desc.end),
 319                 offsetEnd: Math.max(desc.start, desc.end),
 320                 _with: {tagName: desc.tagName, attrs: desc.attrs}
 321             });
 322         } else {
 323             return this.__super__.wrapWith.call(this, desc);
 324         }
 325     },
 326
 327     split: function(params) {
 328         var parentElement = this.parent(),
 329             passed = false,
 330             succeedingChildren = [],
 331             prefix = this.getText().substr(0, params.offset),
 332             suffix = this.getText().substr(params.offset);
 333
 334         parentElement.contents().forEach(function(child) {
 335             if(passed) {
 336                 succeedingChildren.push(child);
 337             }
 338             if(child.sameNode(this)) {
 339                 passed = true;
 340             }
 341         }.bind(this));
 342
 343         if(prefix.length > 0) {
 344             this.setText(prefix);
 345         }
 346         else {
 347             this.detach();
 348         }
 349
 350         var attrs = {};
 351         parentElement.getAttrs().forEach(function(attr) {attrs[attr.name] = attr.value; });
 352         var newElement = this.document.createDocumentNode({tagName: parentElement.getTagName(), attrs: attrs});
 353         parentElement.after(newElement);
 354
 355         succeedingChildren.reverse().forEach(function(child) {
 356             newElement.prepend(child);
 357         });
 358         if(suffix.length > 0) {
 359             newElement.prepend({text: suffix});
 360         }
 361
 362         return {first: parentElement, second: newElement};
 363     },
 364
 365     divideWithElementNode: function(node, params) {
 366         var insertion = this.getNodeInsertion(node),
 367             myText = this.getText();
 368
 369         if(params.offset === myText.length) {
 370             return this.after(node);
 371         }
 372         if(params.offset === 0) {
 373             return this.before(node);
 374         }
 375
 376         var lhsText = myText.substr(0, params.offset),
 377             rhsText = myText.substr(params.offset),
 378             rhsTextNode = this.document.createDocumentNode({text: rhsText});
 379
 380         this.setText(lhsText);
 381         this.after(insertion.ofNode);
 382         insertion.ofNode.after(rhsTextNode);
 383         return insertion.ofNode;
 384     }
 385 };
 386
 387 var documentTransformations = {
 388     wrapNodes: function(params) {
 389         if(!(params.node1.parent().sameNode(params.node2.parent()))) {
 390             throw new Error('Wrapping non-sibling nodes not supported.');
 391         }
 392
 393         var parent = params.node1.parent(),
 394             parentContents = parent.contents(),
 395             wrapper = this.createDocumentNode({
 396                 tagName: params._with.tagName,
 397                 attrs: params._with.attrs}),
 398             idx1 = parent.indexOf(params.node1),
 399             idx2 = parent.indexOf(params.node2);
 400
 401         if(idx1 > idx2) {
 402             var tmp = idx1;
 403             idx1 = idx2;
 404             idx2 = tmp;
 405         }
 406
 407         var insertingMethod, insertingTarget;
 408         if(idx1 === 0) {
 409             insertingMethod = 'prepend';
 410             insertingTarget = parent;
 411         } else {
 412             insertingMethod = 'after';
 413             insertingTarget = parentContents[idx1-1];
 414         }
 415
 416         for(var i = idx1; i <= idx2; i++) {
 417             if(!parentContents[i].getProperty('describesParent')) {
 418                 wrapper.append(parentContents[i].detach());
 419             }
 420         }
 421
 422         insertingTarget[insertingMethod](wrapper);
 423         return wrapper;
 424     },
 425
 426     _wrapText: function(params) {
 427         params = _.extend({textNodeIdx: 0}, params);
 428         if(typeof params.textNodeIdx === 'number') {
 429             params.textNodeIdx = [params.textNodeIdx];
 430         }
 431
 432         var contentsInside = params.inside.contents(),
 433             idx1 = Math.min.apply(Math, params.textNodeIdx),
 434             idx2 = Math.max.apply(Math, params.textNodeIdx),
 435             textNode1 = contentsInside[idx1],
 436             textNode2 = contentsInside[idx2],
 437             sameNode = textNode1.sameNode(textNode2),
 438             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 439             prefixInside = textNode1.getText().substr(params.offsetStart),
 440             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 441             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 442         ;
 443
 444         if(!(textNode1.parent().sameNode(textNode2.parent()))) {
 445             throw new Error('Wrapping text in non-sibling text nodes not supported.');
 446         }
 447
 448         var wrapperElement = this.createDocumentNode({tagName: params._with.tagName, attrs: params._with.attrs});
 449         textNode1.after(wrapperElement);
 450         textNode1.detach();
 451
 452         if(prefixOutside.length > 0) {
 453             wrapperElement.before({text:prefixOutside});
 454         }
 455         if(sameNode) {
 456             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 457             wrapperElement.append({text: core});
 458         } else {
 459             textNode2.detach();
 460             if(prefixInside.length > 0) {
 461                 wrapperElement.append({text: prefixInside});
 462             }
 463             for(var i = idx1 + 1; i < idx2; i++) {
 464                 if(!contentsInside[i].getProperty('describesParent')) {
 465                     wrapperElement.append(contentsInside[i]);
 466                 }
 467             }
 468             if(suffixInside.length > 0) {
 469                 wrapperElement.append({text: suffixInside});
 470             }
 471         }
 472         if(suffixOutside.length > 0) {
 473             wrapperElement.after({text: suffixOutside});
 474         }
 475         return wrapperElement;
 476     },
 477     replaceRoot: function(node) {
 478         var insertion = this.getNodeInsertion(node);
 479         this.root.detach();
 480         this._defineDocumentProperties(insertion.ofNode._$);
 481         insertion.ofNode.triggerChangeEvent('nodeAdded');
 482         return insertion.ofNode;
 483     },
 484     deleteText: function(params) {
 485         var ptr, next, nextNext, toDetach, middle, text;
 486
 487         if(params.from.node.sameNode(params.to.node)) {
 488             ptr = params.from.node;
 489             text = ptr.getText();
 490             ptr.setText(text.substr(0, params.from.offset) + text.substr(params.to.offset));
 491             return;
 492         }
 493
 494         // Both edge text nodes need to be edited before anything else happen in case that
 495         // they get merged when detaching content between them.
 496         params.from.node.setText(params.from.node.getText().substr(0, params.from.offset));
 497         params.to.node.setText(params.to.node.getText().substr(params.to.offset));
 498
 499         ptr = params.from.node;
 500         next = ptr.next();
 501
 502         while(next || ptr.parent()) {
 503             if(next) {
 504                 if(next.sameNode(params.to.node)) {
 505                     return;
 506                 }
 507                 else if(next.nodeType === Node.ELEMENT_NODE && next.containsNode(params.to.node)) {
 508                     middle = next;
 509                     break;
 510                 } else {
 511                     toDetach = next;
 512                     next = next.next();
 513                     nextNext = next ? next.next() : null;
 514                     toDetach.detach({normalizeStrategy: (next && next.sameNode(params.to.node)) ? 'merge' : 'detach-right'});
 515                     if(next && !next.isInDocument()) {
 516                         next = nextNext;
 517                     }
 518                 }
 519             } else {
 520                 ptr = ptr.parent();
 521                 next = ptr.next();
 522             }
 523         }
 524
 525         if(!this.containsNode(params.to.node)) {
 526             // The end node was merged during detaching nodes above - there is nothing more left to do.
 527             return;
 528         }
 529
 530         ptr = middle.contents()[0];
 531         while(ptr && !ptr.sameNode(params.to.node)) {
 532             if(ptr.nodeType === Node.ELEMENT_NODE && ptr.containsNode(params.to.node)) {
 533                 ptr = ptr.contents()[0];
 534                 continue;
 535             } else {
 536                 ptr = ptr.next();
 537                 ptr.prev().detach();
 538             }
 539         }
 540     }
 541 };
 542
 543 return {
 544     document: {
 545         transformations: documentTransformations
 546     },
 547     documentNode: {
 548         transformations: documentNodeTransformations
 549     },
 550     elementNode: {
 551         transformations: elementNodeTransformations
 552     },
 553     textNode: {
 554         transformations: textNodeTransformations
 555     }
 556 };
 557
 558 });