model.js 36 KB

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  1. /**
  2. * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
  3. * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
  4. */
  5. /**
  6. * @module engine/model/model
  7. */
  8. import Batch from './batch';
  9. import Writer from './writer';
  10. import Schema from './schema';
  11. import Document from './document';
  12. import MarkerCollection from './markercollection';
  13. import ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';
  14. import mix from '@ckeditor/ckeditor5-utils/src/mix';
  15. import ModelElement from './element';
  16. import ModelRange from './range';
  17. import ModelPosition from './position';
  18. import ModelSelection from './selection';
  19. import insertContent from './utils/insertcontent';
  20. import deleteContent from './utils/deletecontent';
  21. import modifySelection from './utils/modifyselection';
  22. import getSelectedContent from './utils/getselectedcontent';
  23. import { injectSelectionPostFixer } from './utils/selection-post-fixer';
  24. import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
  25. // @if CK_DEBUG_ENGINE // const { dumpTrees } = require( '../dev-utils/utils' );
  26. // @if CK_DEBUG_ENGINE // const { OperationReplayer } = require( '../dev-utils/operationreplayer' ).default;
  27. /**
  28. * Editor's data model. Read about the model in the
  29. * {@glink framework/guides/architecture/editing-engine engine architecture guide}.
  30. *
  31. * @mixes module:utils/observablemixin~ObservableMixin
  32. */
  33. export default class Model {
  34. constructor() {
  35. /**
  36. * Model's marker collection.
  37. *
  38. * @readonly
  39. * @member {module:engine/model/markercollection~MarkerCollection}
  40. */
  41. this.markers = new MarkerCollection();
  42. /**
  43. * Model's document.
  44. *
  45. * @readonly
  46. * @member {module:engine/model/document~Document}
  47. */
  48. this.document = new Document( this );
  49. /**
  50. * Model's schema.
  51. *
  52. * @readonly
  53. * @member {module:engine/model/schema~Schema}
  54. */
  55. this.schema = new Schema();
  56. /**
  57. * All callbacks added by {@link module:engine/model/model~Model#change} or
  58. * {@link module:engine/model/model~Model#enqueueChange} methods waiting to be executed.
  59. *
  60. * @private
  61. * @type {Array.<Function>}
  62. */
  63. this._pendingChanges = [];
  64. /**
  65. * The last created and currently used writer instance.
  66. *
  67. * @private
  68. * @member {module:engine/model/writer~Writer}
  69. */
  70. this._currentWriter = null;
  71. [ 'insertContent', 'deleteContent', 'modifySelection', 'getSelectedContent', 'applyOperation' ]
  72. .forEach( methodName => this.decorate( methodName ) );
  73. // Adding operation validation with `highest` priority, so it is called before any other feature would like
  74. // to do anything with the operation. If the operation has incorrect parameters it should throw on the earliest occasion.
  75. this.on( 'applyOperation', ( evt, args ) => {
  76. const operation = args[ 0 ];
  77. operation._validate();
  78. }, { priority: 'highest' } );
  79. // Register some default abstract entities.
  80. this.schema.register( '$root', {
  81. isLimit: true
  82. } );
  83. this.schema.register( '$block', {
  84. allowIn: '$root',
  85. isBlock: true
  86. } );
  87. this.schema.register( '$text', {
  88. allowIn: '$block',
  89. isInline: true
  90. } );
  91. this.schema.register( '$clipboardHolder', {
  92. allowContentOf: '$root',
  93. isLimit: true
  94. } );
  95. this.schema.extend( '$text', { allowIn: '$clipboardHolder' } );
  96. // An element needed by the `upcastElementToMarker` converter.
  97. // This element temporarily represents a marker boundary during the conversion process and is removed
  98. // at the end of the conversion. `UpcastDispatcher` or at least `Conversion` class looks like a
  99. // better place for this registration but both know nothing about `Schema`.
  100. this.schema.register( '$marker' );
  101. this.schema.addChildCheck( ( context, childDefinition ) => {
  102. if ( childDefinition.name === '$marker' ) {
  103. return true;
  104. }
  105. } );
  106. injectSelectionPostFixer( this );
  107. // @if CK_DEBUG_ENGINE // this.on( 'applyOperation', () => {
  108. // @if CK_DEBUG_ENGINE // dumpTrees( this.document, this.document.version );
  109. // @if CK_DEBUG_ENGINE // }, { priority: 'lowest' } );
  110. }
  111. /**
  112. * The `change()` method is the primary way of changing the model. You should use it to modify all document nodes
  113. * (including detached nodes – i.e. nodes not added to the {@link module:engine/model/model~Model#document model document}),
  114. * the {@link module:engine/model/document~Document#selection document's selection}, and
  115. * {@link module:engine/model/model~Model#markers model markers}.
  116. *
  117. * model.change( writer => {
  118. * writer.insertText( 'foo', paragraph, 'end' );
  119. * } );
  120. *
  121. * All changes inside the change block use the same {@link module:engine/model/batch~Batch} so they are combined
  122. * into a single undo step.
  123. *
  124. * model.change( writer => {
  125. * writer.insertText( 'foo', paragraph, 'end' ); // foo.
  126. *
  127. * model.change( writer => {
  128. * writer.insertText( 'bar', paragraph, 'end' ); // foobar.
  129. * } );
  130. *
  131. * writer.insertText( 'bom', paragraph, 'end' ); // foobarbom.
  132. * } );
  133. *
  134. * The callback of the `change()` block is executed synchronously.
  135. *
  136. * You can also return a value from the change block.
  137. *
  138. * const img = model.change( writer => {
  139. * return writer.createElement( 'img' );
  140. * } );
  141. *
  142. * @see #enqueueChange
  143. * @param {Function} callback Callback function which may modify the model.
  144. * @returns {*} Value returned by the callback.
  145. */
  146. change( callback ) {
  147. try {
  148. if ( this._pendingChanges.length === 0 ) {
  149. // If this is the outermost block, create a new batch and start `_runPendingChanges` execution flow.
  150. this._pendingChanges.push( { batch: new Batch(), callback } );
  151. return this._runPendingChanges()[ 0 ];
  152. } else {
  153. // If this is not the outermost block, just execute the callback.
  154. return callback( this._currentWriter );
  155. }
  156. } catch ( err ) {
  157. // @if CK_DEBUG // throw err;
  158. CKEditorError.rethrowUnexpectedError( err, this );
  159. }
  160. }
  161. /**
  162. * The `enqueueChange()` method performs similar task as the {@link #change `change()` method}, with two major differences.
  163. *
  164. * First, the callback of `enqueueChange()` is executed when all other enqueued changes are done. It might be executed
  165. * immediately if it is not nested in any other change block, but if it is nested in another (enqueue)change block,
  166. * it will be delayed and executed after the outermost block.
  167. *
  168. * model.change( writer => {
  169. * console.log( 1 );
  170. *
  171. * model.enqueueChange( writer => {
  172. * console.log( 2 );
  173. * } );
  174. *
  175. * console.log( 3 );
  176. * } ); // Will log: 1, 3, 2.
  177. *
  178. * Second, it lets you define the {@link module:engine/model/batch~Batch} into which you want to add your changes.
  179. * By default, a new batch is created. In the sample above, `change` and `enqueueChange` blocks use a different
  180. * batch (and different {@link module:engine/model/writer~Writer} since each of them operates on the separate batch).
  181. *
  182. * When using the `enqueueChange()` block you can also add some changes to the batch you used before.
  183. *
  184. * model.enqueueChange( batch, writer => {
  185. * writer.insertText( 'foo', paragraph, 'end' );
  186. * } );
  187. *
  188. * The batch instance can be obtained from {@link module:engine/model/writer~Writer#batch the writer}.
  189. *
  190. * @param {module:engine/model/batch~Batch|'transparent'|'default'} batchOrType Batch or batch type should be used in the callback.
  191. * If not defined, a new batch will be created.
  192. * @param {Function} callback Callback function which may modify the model.
  193. */
  194. enqueueChange( batchOrType, callback ) {
  195. try {
  196. if ( typeof batchOrType === 'string' ) {
  197. batchOrType = new Batch( batchOrType );
  198. } else if ( typeof batchOrType == 'function' ) {
  199. callback = batchOrType;
  200. batchOrType = new Batch();
  201. }
  202. this._pendingChanges.push( { batch: batchOrType, callback } );
  203. if ( this._pendingChanges.length == 1 ) {
  204. this._runPendingChanges();
  205. }
  206. } catch ( err ) {
  207. // @if CK_DEBUG // throw err;
  208. CKEditorError.rethrowUnexpectedError( err, this );
  209. }
  210. }
  211. /**
  212. * {@link module:utils/observablemixin~ObservableMixin#decorate Decorated} function for applying
  213. * {@link module:engine/model/operation/operation~Operation operations} to the model.
  214. *
  215. * This is a low-level way of changing the model. It is exposed for very specific use cases (like the undo feature).
  216. * Normally, to modify the model, you will want to use {@link module:engine/model/writer~Writer `Writer`}.
  217. * See also {@glink framework/guides/architecture/editing-engine#changing-the-model Changing the model} section
  218. * of the {@glink framework/guides/architecture/editing-engine Editing architecture} guide.
  219. *
  220. * @param {module:engine/model/operation/operation~Operation} operation The operation to apply.
  221. */
  222. applyOperation( operation ) {
  223. // @if CK_DEBUG_ENGINE // console.log( 'Applying ' + operation );
  224. // @if CK_DEBUG_ENGINE // if ( !this._operationLogs ) {
  225. // @if CK_DEBUG_ENGINE // this._operationLogs = [];
  226. // @if CK_DEBUG_ENGINE // }
  227. // @if CK_DEBUG_ENGINE // this._operationLogs.push( JSON.stringify( operation ) );
  228. // @if CK_DEBUG_ENGINE //if ( !this._appliedOperations ) {
  229. // @if CK_DEBUG_ENGINE // this._appliedOperations = [];
  230. // @if CK_DEBUG_ENGINE //}
  231. // @if CK_DEBUG_ENGINE //this._appliedOperations.push( operation );
  232. operation._execute();
  233. }
  234. // @if CK_DEBUG_ENGINE // getAppliedOperation() {
  235. // @if CK_DEBUG_ENGINE // if ( !this._appliedOperations ) {
  236. // @if CK_DEBUG_ENGINE // return '';
  237. // @if CK_DEBUG_ENGINE // }
  238. // @if CK_DEBUG_ENGINE // return this._appliedOperations.map( JSON.stringify ).join( '-------' );
  239. // @if CK_DEBUG_ENGINE // }
  240. // @if CK_DEBUG_ENGINE // createReplayer( stringifiedOperations ) {
  241. // @if CK_DEBUG_ENGINE // return new OperationReplayer( this, '-------', stringifiedOperations );
  242. // @if CK_DEBUG_ENGINE // }
  243. /**
  244. * Inserts content at the position in the editor specified by the selection, as one would expect the paste
  245. * functionality to work.
  246. *
  247. * This is a high-level method. It takes the {@link #schema schema} into consideration when inserting
  248. * the content, clears the given selection's content before inserting nodes and moves the selection
  249. * to its target position at the end of the process.
  250. * It can split elements, merge them, wrap bare text nodes with paragraphs, etc. &mdash; just like the
  251. * pasting feature should do.
  252. *
  253. * For lower-level methods see {@link module:engine/model/writer~Writer `Writer`}.
  254. *
  255. * This method, unlike {@link module:engine/model/writer~Writer `Writer`}'s methods, does not have to be used
  256. * inside a {@link #change `change()` block}.
  257. *
  258. * # Conversion and schema
  259. *
  260. * Inserting elements and text nodes into the model is not enough to make CKEditor 5 render that content
  261. * to the user. CKEditor 5 implements a model-view-controller architecture and what `model.insertContent()` does
  262. * is only adding nodes to the model. Additionally, you need to define
  263. * {@glink framework/guides/architecture/editing-engine#conversion converters} between the model and view
  264. * and define those nodes in the {@glink framework/guides/architecture/editing-engine#schema schema}.
  265. *
  266. * So, while this method may seem similar to CKEditor 4 `editor.insertHtml()` (in fact, both methods
  267. * are used for paste-like content insertion), the CKEditor 5 method cannot be use to insert arbitrary HTML
  268. * unless converters are defined for all elements and attributes in that HTML.
  269. *
  270. * # Examples
  271. *
  272. * Using `insertContent()` with a manually created model structure:
  273. *
  274. * // Let's create a document fragment containing such content as:
  275. * //
  276. * // <paragraph>foo</paragraph>
  277. * // <blockQuote>
  278. * // <paragraph>bar</paragraph>
  279. * // </blockQuote>
  280. * const docFrag = editor.model.change( writer => {
  281. * const p1 = writer.createElement( 'paragraph' );
  282. * const p2 = writer.createElement( 'paragraph' );
  283. * const blockQuote = writer.createElement( 'blockQuote' );
  284. * const docFrag = writer.createDocumentFragment();
  285. *
  286. * writer.append( p1, docFrag );
  287. * writer.append( blockQuote, docFrag );
  288. * writer.append( p2, blockQuote );
  289. * writer.insertText( 'foo', p1 );
  290. * writer.insertText( 'bar', p2 );
  291. *
  292. * return docFrag;
  293. * } );
  294. *
  295. * // insertContent() does not have to be used in a change() block. It can, though,
  296. * // so this code could be moved to the callback defined above.
  297. * editor.model.insertContent( docFrag );
  298. *
  299. * Using `insertContent()` with an HTML string converted to a model document fragment (similar to the pasting mechanism):
  300. *
  301. * // You can create your own HtmlDataProcessor instance or use editor.data.processor
  302. * // if you have not overridden the default one (which is the HtmlDataProcessor instance).
  303. * const htmlDP = new HtmlDataProcessor();
  304. *
  305. * // Convert an HTML string to a view document fragment:
  306. * const viewFragment = htmlDP.toView( htmlString );
  307. *
  308. * // Convert the view document fragment to a model document fragment
  309. * // in the context of $root. This conversion takes the schema into
  310. * // account so if, for example, the view document fragment contained a bare text node,
  311. * // this text node cannot be a child of $root, so it will be automatically
  312. * // wrapped with a <paragraph>. You can define the context yourself (in the second parameter),
  313. * // and e.g. convert the content like it would happen in a <paragraph>.
  314. * // Note: The clipboard feature uses a custom context called $clipboardHolder
  315. * // which has a loosened schema.
  316. * const modelFragment = editor.data.toModel( viewFragment );
  317. *
  318. * editor.model.insertContent( modelFragment );
  319. *
  320. * By default this method will use the document selection but it can also be used with a position, range or selection instance.
  321. *
  322. * // Insert text at the current document selection position.
  323. * editor.model.change( writer => {
  324. * editor.model.insertContent( writer.createText( 'x' ) );
  325. * } );
  326. *
  327. * // Insert text at a given position - the document selection will not be modified.
  328. * editor.model.change( writer => {
  329. * editor.model.insertContent( writer.createText( 'x' ), doc.getRoot(), 2 );
  330. *
  331. * // Which is a shorthand for:
  332. * editor.model.insertContent( writer.createText( 'x' ), writer.createPositionAt( doc.getRoot(), 2 ) );
  333. * } );
  334. *
  335. * If an instance of {@link module:engine/model/selection~Selection} is passed as `selectable`
  336. * it will be moved to the target position (where the document selection should be moved after the insertion).
  337. *
  338. * editor.model.change( writer => {
  339. * // Insert text replacing the given selection instance.
  340. * const selection = writer.createSelection( paragraph, 'in' );
  341. *
  342. * editor.model.insertContent( writer.createText( 'x' ), selection );
  343. *
  344. * // insertContent() modifies the passed selection instance so it can be used to set the document selection.
  345. * // Note: This is not necessary when you passed the document selection to insertContent().
  346. * writer.setSelection( selection );
  347. * } );
  348. *
  349. * @fires insertContent
  350. * @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.
  351. * @param {module:engine/model/selection~Selectable} [selectable=model.document.selection]
  352. * The selection into which the content should be inserted. If not provided the current model document selection will be used.
  353. * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] To be used when a model item was passed as `selectable`.
  354. * This param defines a position in relation to that item.
  355. * @returns {module:engine/model/range~Range} Range which contains all the performed changes. This is a range that, if removed,
  356. * would return the model to the state before the insertion. If no changes were preformed by `insertContent`, returns a range collapsed
  357. * at the insertion position.
  358. */
  359. insertContent( content, selectable, placeOrOffset ) {
  360. return insertContent( this, content, selectable, placeOrOffset );
  361. }
  362. /**
  363. * Deletes content of the selection and merge siblings. The resulting selection is always collapsed.
  364. *
  365. * **Note:** For the sake of predictability, the resulting selection should always be collapsed.
  366. * In cases where a feature wants to modify deleting behavior so selection isn't collapsed
  367. * (e.g. a table feature may want to keep row selection after pressing <kbd>Backspace</kbd>),
  368. * then that behavior should be implemented in the view's listener. At the same time, the table feature
  369. * will need to modify this method's behavior too, e.g. to "delete contents and then collapse
  370. * the selection inside the last selected cell" or "delete the row and collapse selection somewhere near".
  371. * That needs to be done in order to ensure that other features which use `deleteContent()` will work well with tables.
  372. *
  373. * @fires deleteContent
  374. * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection
  375. * Selection of which the content should be deleted.
  376. * @param {Object} [options]
  377. * @param {Boolean} [options.leaveUnmerged=false] Whether to merge elements after removing the content of the selection.
  378. *
  379. * For example `<heading1>x[x</heading1><paragraph>y]y</paragraph>` will become:
  380. *
  381. * * `<heading1>x^y</heading1>` with the option disabled (`leaveUnmerged == false`)
  382. * * `<heading1>x^</heading1><paragraph>y</paragraph>` with enabled (`leaveUnmerged == true`).
  383. *
  384. * Note: {@link module:engine/model/schema~Schema#isObject object} and {@link module:engine/model/schema~Schema#isLimit limit}
  385. * elements will not be merged.
  386. *
  387. * @param {Boolean} [options.doNotResetEntireContent=false] Whether to skip replacing the entire content with a
  388. * paragraph when the entire content was selected.
  389. *
  390. * For example `<heading1>[x</heading1><paragraph>y]</paragraph>` will become:
  391. *
  392. * * `<paragraph>^</paragraph>` with the option disabled (`doNotResetEntireContent == false`)
  393. * * `<heading1>^</heading1>` with enabled (`doNotResetEntireContent == true`)
  394. *
  395. * @param {Boolean} [options.doNotAutoparagraph=false] Whether to create a paragraph if after content deletion selection is moved
  396. * to a place where text cannot be inserted.
  397. *
  398. * For example `<paragraph>x</paragraph>[<image src="foo.jpg"></image>]` will become:
  399. *
  400. * * `<paragraph>x</paragraph><paragraph>[]</paragraph>` with the option disabled (`doNotAutoparagraph == false`)
  401. * * `<paragraph>x[]</paragraph>` with the option enabled (`doNotAutoparagraph == true`).
  402. *
  403. * **Note:** if there is no valid position for the selection, the paragraph will always be created:
  404. *
  405. * `[<image src="foo.jpg"></image>]` -> `<paragraph>[]</paragraph>`.
  406. */
  407. deleteContent( selection, options ) {
  408. deleteContent( this, selection, options );
  409. }
  410. /**
  411. * Modifies the selection. Currently, the supported modifications are:
  412. *
  413. * * Extending. The selection focus is moved in the specified `options.direction` with a step specified in `options.unit`.
  414. * Possible values for `unit` are:
  415. * * `'character'` (default) - moves selection by one user-perceived character. In most cases this means moving by one
  416. * character in `String` sense. However, unicode also defines "combing marks". These are special symbols, that combines
  417. * with a symbol before it ("base character") to create one user-perceived character. For example, `q̣̇` is a normal
  418. * letter `q` with two "combining marks": upper dot (`Ux0307`) and lower dot (`Ux0323`). For most actions, i.e. extending
  419. * selection by one position, it is correct to include both "base character" and all of it's "combining marks". That is
  420. * why `'character'` value is most natural and common method of modifying selection.
  421. * * `'codePoint'` - moves selection by one unicode code point. In contrary to, `'character'` unit, this will insert
  422. * selection between "base character" and "combining mark", because "combining marks" have their own unicode code points.
  423. * However, for technical reasons, unicode code points with values above `UxFFFF` are represented in native `String` by
  424. * two characters, called "surrogate pairs". Halves of "surrogate pairs" have a meaning only when placed next to each other.
  425. * For example `𨭎` is represented in `String` by `\uD862\uDF4E`. Both `\uD862` and `\uDF4E` do not have any meaning
  426. * outside the pair (are rendered as ? when alone). Position between them would be incorrect. In this case, selection
  427. * extension will include whole "surrogate pair".
  428. * * `'word'` - moves selection by a whole word.
  429. *
  430. * **Note:** if you extend a forward selection in a backward direction you will in fact shrink it.
  431. *
  432. * @fires modifySelection
  433. * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection
  434. * The selection to modify.
  435. * @param {Object} [options]
  436. * @param {'forward'|'backward'} [options.direction='forward'] The direction in which the selection should be modified.
  437. * @param {'character'|'codePoint'|'word'} [options.unit='character'] The unit by which selection should be modified.
  438. */
  439. modifySelection( selection, options ) {
  440. modifySelection( this, selection, options );
  441. }
  442. /**
  443. * Gets a clone of the selected content.
  444. *
  445. * For example, for the following selection:
  446. *
  447. * ```html
  448. * <paragraph>x</paragraph>
  449. * <blockQuote>
  450. * <paragraph>y</paragraph>
  451. * <heading1>fir[st</heading1>
  452. * </blockQuote>
  453. * <paragraph>se]cond</paragraph>
  454. * <paragraph>z</paragraph>
  455. * ```
  456. *
  457. * It will return a document fragment with such a content:
  458. *
  459. * ```html
  460. * <blockQuote>
  461. * <heading1>st</heading1>
  462. * </blockQuote>
  463. * <paragraph>se</paragraph>
  464. * ```
  465. *
  466. * @fires getSelectedContent
  467. * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection
  468. * The selection of which content will be returned.
  469. * @returns {module:engine/model/documentfragment~DocumentFragment}
  470. */
  471. getSelectedContent( selection ) {
  472. return getSelectedContent( this, selection );
  473. }
  474. /**
  475. * Checks whether the given {@link module:engine/model/range~Range range} or
  476. * {@link module:engine/model/element~Element element} has any meaningful content.
  477. *
  478. * Meaningful content is:
  479. *
  480. * * any text node (`options.ignoreWhitespaces` allows controlling whether this text node must also contain
  481. * any non-whitespace characters),
  482. * * or any {@link module:engine/model/schema~Schema#isObject object element},
  483. * * or any {@link module:engine/model/markercollection~Marker marker} which
  484. * {@link module:engine/model/markercollection~Marker#_affectsData affects data}.
  485. *
  486. * This means that a range containing an empty `<paragraph></paragraph>` is not considered to have a meaningful content.
  487. * However, a range containing an `<image></image>` (which would normally be marked in the schema as an object element)
  488. * is considered non-empty.
  489. *
  490. * @param {module:engine/model/range~Range|module:engine/model/element~Element} rangeOrElement Range or element to check.
  491. * @param {Object} [options]
  492. * @param {Boolean} [options.ignoreWhitespaces] Whether text node with whitespaces only should be considered empty.
  493. * @returns {Boolean}
  494. */
  495. hasContent( rangeOrElement, options ) {
  496. const range = rangeOrElement instanceof ModelElement ? ModelRange._createIn( rangeOrElement ) : rangeOrElement;
  497. if ( range.isCollapsed ) {
  498. return false;
  499. }
  500. // Check if there are any markers which affects data in this given range.
  501. for ( const intersectingMarker of this.markers.getMarkersIntersectingRange( range ) ) {
  502. if ( intersectingMarker.affectsData ) {
  503. return true;
  504. }
  505. }
  506. const { ignoreWhitespaces = false } = options || {};
  507. for ( const item of range.getItems() ) {
  508. if ( item.is( 'textProxy' ) ) {
  509. if ( !ignoreWhitespaces ) {
  510. return true;
  511. } else if ( item.data.search( /\S/ ) !== -1 ) {
  512. return true;
  513. }
  514. } else if ( this.schema.isObject( item ) ) {
  515. return true;
  516. }
  517. }
  518. return false;
  519. }
  520. /**
  521. * Creates a position from the given root and path in that root.
  522. *
  523. * Note: This method is also available as
  524. * {@link module:engine/model/writer~Writer#createPositionFromPath `Writer#createPositionFromPath()`}.
  525. *
  526. * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} root Root of the position.
  527. * @param {Array.<Number>} path Position path. See {@link module:engine/model/position~Position#path}.
  528. * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.
  529. * See {@link module:engine/model/position~PositionStickiness}.
  530. * @returns {module:engine/model/position~Position}
  531. */
  532. createPositionFromPath( root, path, stickiness ) {
  533. return new ModelPosition( root, path, stickiness );
  534. }
  535. /**
  536. * Creates position at the given location. The location can be specified as:
  537. *
  538. * * a {@link module:engine/model/position~Position position},
  539. * * a parent element and offset in that element,
  540. * * a parent element and `'end'` (the position will be set at the end of that element),
  541. * * a {@link module:engine/model/item~Item model item} and `'before'` or `'after'`
  542. * (the position will be set before or after the given model item).
  543. *
  544. * This method is a shortcut to other factory methods such as:
  545. *
  546. * * {@link module:engine/model/model~Model#createPositionBefore `createPositionBefore()`},
  547. * * {@link module:engine/model/model~Model#createPositionAfter `createPositionAfter()`}.
  548. *
  549. * Note: This method is also available as
  550. * {@link module:engine/model/writer~Writer#createPositionAt `Writer#createPositionAt()`},
  551. *
  552. * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition
  553. * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when
  554. * first parameter is a {@link module:engine/model/item~Item model item}.
  555. */
  556. createPositionAt( itemOrPosition, offset ) {
  557. return ModelPosition._createAt( itemOrPosition, offset );
  558. }
  559. /**
  560. * Creates a new position after the given {@link module:engine/model/item~Item model item}.
  561. *
  562. * Note: This method is also available as
  563. * {@link module:engine/model/writer~Writer#createPositionAfter `Writer#createPositionAfter()`}.
  564. *
  565. * @param {module:engine/model/item~Item} item Item after which the position should be placed.
  566. * @returns {module:engine/model/position~Position}
  567. */
  568. createPositionAfter( item ) {
  569. return ModelPosition._createAfter( item );
  570. }
  571. /**
  572. * Creates a new position before the given {@link module:engine/model/item~Item model item}.
  573. *
  574. * Note: This method is also available as
  575. * {@link module:engine/model/writer~Writer#createPositionBefore `Writer#createPositionBefore()`}.
  576. *
  577. * @param {module:engine/model/item~Item} item Item before which the position should be placed.
  578. * @returns {module:engine/model/position~Position}
  579. */
  580. createPositionBefore( item ) {
  581. return ModelPosition._createBefore( item );
  582. }
  583. /**
  584. * Creates a range spanning from the `start` position to the `end` position.
  585. *
  586. * Note: This method is also available as
  587. * {@link module:engine/model/writer~Writer#createRange `Writer#createRange()`}:
  588. *
  589. * model.change( writer => {
  590. * const range = writer.createRange( start, end );
  591. * } );
  592. *
  593. * @param {module:engine/model/position~Position} start Start position.
  594. * @param {module:engine/model/position~Position} [end] End position. If not set, the range will be collapsed
  595. * to the `start` position.
  596. * @returns {module:engine/model/range~Range}
  597. */
  598. createRange( start, end ) {
  599. return new ModelRange( start, end );
  600. }
  601. /**
  602. * Creates a range inside the given element which starts before the first child of
  603. * that element and ends after the last child of that element.
  604. *
  605. * Note: This method is also available as
  606. * {@link module:engine/model/writer~Writer#createRangeIn `Writer#createRangeIn()`}:
  607. *
  608. * model.change( writer => {
  609. * const range = writer.createRangeIn( paragraph );
  610. * } );
  611. *
  612. * @param {module:engine/model/element~Element} element Element which is a parent for the range.
  613. * @returns {module:engine/model/range~Range}
  614. */
  615. createRangeIn( element ) {
  616. return ModelRange._createIn( element );
  617. }
  618. /**
  619. * Creates a range that starts before the given {@link module:engine/model/item~Item model item} and ends after it.
  620. *
  621. * Note: This method is also available on `writer` instance as
  622. * {@link module:engine/model/writer~Writer#createRangeOn `Writer.createRangeOn()`}:
  623. *
  624. * model.change( writer => {
  625. * const range = writer.createRangeOn( paragraph );
  626. * } );
  627. *
  628. * @param {module:engine/model/item~Item} item
  629. * @returns {module:engine/model/range~Range}
  630. */
  631. createRangeOn( item ) {
  632. return ModelRange._createOn( item );
  633. }
  634. /**
  635. * Creates a new selection instance based on the given {@link module:engine/model/selection~Selectable selectable}
  636. * or creates an empty selection if no arguments were passed.
  637. *
  638. * Note: This method is also available as
  639. * {@link module:engine/model/writer~Writer#createSelection `Writer#createSelection()`}.
  640. *
  641. * // Creates empty selection without ranges.
  642. * const selection = writer.createSelection();
  643. *
  644. * // Creates selection at the given range.
  645. * const range = writer.createRange( start, end );
  646. * const selection = writer.createSelection( range );
  647. *
  648. * // Creates selection at the given ranges
  649. * const ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];
  650. * const selection = writer.createSelection( ranges );
  651. *
  652. * // Creates selection from the other selection.
  653. * // Note: It doesn't copies selection attributes.
  654. * const otherSelection = writer.createSelection();
  655. * const selection = writer.createSelection( otherSelection );
  656. *
  657. * // Creates selection from the given document selection.
  658. * // Note: It doesn't copies selection attributes.
  659. * const documentSelection = model.document.selection;
  660. * const selection = writer.createSelection( documentSelection );
  661. *
  662. * // Creates selection at the given position.
  663. * const position = writer.createPositionFromPath( root, path );
  664. * const selection = writer.createSelection( position );
  665. *
  666. * // Creates selection at the given offset in the given element.
  667. * const paragraph = writer.createElement( 'paragraph' );
  668. * const selection = writer.createSelection( paragraph, offset );
  669. *
  670. * // Creates a range inside an {@link module:engine/model/element~Element element} which starts before the
  671. * // first child of that element and ends after the last child of that element.
  672. * const selection = writer.createSelection( paragraph, 'in' );
  673. *
  674. * // Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends
  675. * // just after the item.
  676. * const selection = writer.createSelection( paragraph, 'on' );
  677. *
  678. * // Additional options (`'backward'`) can be specified as the last argument.
  679. *
  680. * // Creates backward selection.
  681. * const selection = writer.createSelection( range, { backward: true } );
  682. *
  683. * @param {module:engine/model/selection~Selectable} selectable
  684. * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.
  685. * @param {Object} [options]
  686. * @param {Boolean} [options.backward] Sets this selection instance to be backward.
  687. * @returns {module:engine/model/selection~Selection}
  688. */
  689. createSelection( selectable, placeOrOffset, options ) {
  690. return new ModelSelection( selectable, placeOrOffset, options );
  691. }
  692. /**
  693. * Creates a {@link module:engine/model/batch~Batch} instance.
  694. *
  695. * **Note:** In most cases creating a batch instance is not necessary as they are created when using:
  696. *
  697. * * {@link #change `change()`},
  698. * * {@link #enqueueChange `enqueueChange()`}.
  699. *
  700. * @param {'transparent'|'default'} [type='default'] The type of the batch.
  701. * @returns {module:engine/model/batch~Batch}
  702. */
  703. createBatch( type ) {
  704. return new Batch( type );
  705. }
  706. /**
  707. * Removes all events listeners set by model instance and destroys {@link module:engine/model/document~Document}.
  708. */
  709. destroy() {
  710. this.document.destroy();
  711. this.stopListening();
  712. }
  713. /**
  714. * Common part of {@link module:engine/model/model~Model#change} and {@link module:engine/model/model~Model#enqueueChange}
  715. * which calls callbacks and returns array of values returned by these callbacks.
  716. *
  717. * @private
  718. * @returns {Array.<*>} Array of values returned by callbacks.
  719. */
  720. _runPendingChanges() {
  721. const ret = [];
  722. this.fire( '_beforeChanges' );
  723. while ( this._pendingChanges.length ) {
  724. // Create a new writer using batch instance created for this chain of changes.
  725. const currentBatch = this._pendingChanges[ 0 ].batch;
  726. this._currentWriter = new Writer( this, currentBatch );
  727. // Execute changes callback and gather the returned value.
  728. const callbackReturnValue = this._pendingChanges[ 0 ].callback( this._currentWriter );
  729. ret.push( callbackReturnValue );
  730. this.document._handleChangeBlock( this._currentWriter );
  731. this._pendingChanges.shift();
  732. this._currentWriter = null;
  733. }
  734. this.fire( '_afterChanges' );
  735. return ret;
  736. }
  737. /**
  738. * Fired when entering the outermost {@link module:engine/model/model~Model#enqueueChange} or
  739. * {@link module:engine/model/model~Model#change} block.
  740. *
  741. * @protected
  742. * @event _beforeChanges
  743. */
  744. /**
  745. * Fired when leaving the outermost {@link module:engine/model/model~Model#enqueueChange} or
  746. * {@link module:engine/model/model~Model#change} block.
  747. *
  748. * @protected
  749. * @event _afterChanges
  750. */
  751. /**
  752. * Fired every time any {@link module:engine/model/operation/operation~Operation operation} is applied on the model
  753. * using {@link #applyOperation}.
  754. *
  755. * Note that this event is suitable only for very specific use-cases. Use it if you need to listen to every single operation
  756. * applied on the document. However, in most cases {@link module:engine/model/document~Document#event:change} should
  757. * be used.
  758. *
  759. * A few callbacks are already added to this event by engine internal classes:
  760. *
  761. * * with `highest` priority operation is validated,
  762. * * with `normal` priority operation is executed,
  763. * * with `low` priority the {@link module:engine/model/document~Document} updates its version,
  764. * * with `low` priority {@link module:engine/model/liveposition~LivePosition} and {@link module:engine/model/liverange~LiveRange}
  765. * update themselves.
  766. *
  767. * @event applyOperation
  768. * @param {Array} args Arguments of the `applyOperation` which is an array with a single element - applied
  769. * {@link module:engine/model/operation/operation~Operation operation}.
  770. */
  771. /**
  772. * Event fired when {@link #insertContent} method is called.
  773. *
  774. * The {@link #insertContent default action of that method} is implemented as a
  775. * listener to this event so it can be fully customized by the features.
  776. *
  777. * **Note** The `selectable` parameter for the {@link #insertContent} is optional. When `undefined` value is passed the method uses
  778. * `model.document.selection`.
  779. *
  780. * @event insertContent
  781. * @param {Array} args The arguments passed to the original method.
  782. */
  783. /**
  784. * Event fired when {@link #deleteContent} method is called.
  785. *
  786. * The {@link #deleteContent default action of that method} is implemented as a
  787. * listener to this event so it can be fully customized by the features.
  788. *
  789. * @event deleteContent
  790. * @param {Array} args The arguments passed to the original method.
  791. */
  792. /**
  793. * Event fired when {@link #modifySelection} method is called.
  794. *
  795. * The {@link #modifySelection default action of that method} is implemented as a
  796. * listener to this event so it can be fully customized by the features.
  797. *
  798. * @event modifySelection
  799. * @param {Array} args The arguments passed to the original method.
  800. */
  801. /**
  802. * Event fired when {@link #getSelectedContent} method is called.
  803. *
  804. * The {@link #getSelectedContent default action of that method} is implemented as a
  805. * listener to this event so it can be fully customized by the features.
  806. *
  807. * @event getSelectedContent
  808. * @param {Array} args The arguments passed to the original method.
  809. */
  810. }
  811. mix( Model, ObservableMixin );