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- /**
- * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- /**
- * @module typing/utils/injecttypingmutationshandling
- */
- import diff from '@ckeditor/ckeditor5-utils/src/diff';
- import DomConverter from '@ckeditor/ckeditor5-engine/src/view/domconverter';
- import { getSingleTextNodeChange, containerChildrenMutated } from './utils';
- /**
- * Handles mutations caused by normal typing.
- *
- * @param {module:core/editor/editor~Editor} editor The editor instance.
- */
- export default function injectTypingMutationsHandling( editor ) {
- editor.editing.view.document.on( 'mutations', ( evt, mutations, viewSelection ) => {
- new MutationHandler( editor ).handle( mutations, viewSelection );
- } );
- }
- /**
- * Helper class for translating DOM mutations into model changes.
- *
- * @private
- */
- class MutationHandler {
- /**
- * Creates an instance of the mutation handler.
- *
- * @param {module:core/editor/editor~Editor} editor
- */
- constructor( editor ) {
- /**
- * Editor instance for which mutations are handled.
- *
- * @readonly
- * @member {module:core/editor/editor~Editor} #editor
- */
- this.editor = editor;
- /**
- * The editing controller.
- *
- * @readonly
- * @member {module:engine/controller/editingcontroller~EditingController} #editing
- */
- this.editing = this.editor.editing;
- }
- /**
- * Handles given mutations.
- *
- * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- * @param {module:engine/view/selection~Selection|null} viewSelection
- */
- handle( mutations, viewSelection ) {
- if ( containerChildrenMutated( mutations ) ) {
- this._handleContainerChildrenMutations( mutations, viewSelection );
- } else {
- for ( const mutation of mutations ) {
- // Fortunately it will never be both.
- this._handleTextMutation( mutation, viewSelection );
- this._handleTextNodeInsertion( mutation );
- }
- }
- }
- /**
- * Handles situations when container's children mutated during input. This can happen when
- * the browser is trying to "fix" DOM in certain situations. For example, when the user starts to type
- * in `<p><a href=""><i>Link{}</i></a></p>`, the browser might change the order of elements
- * to `<p><i><a href="">Link</a>x{}</i></p>`. A similar situation happens when the spell checker
- * replaces a word wrapped with `<strong>` with a word wrapped with a `<b>` element.
- *
- * To handle such situations, the common DOM ancestor of all mutations is converted to the model representation
- * and then compared with the current model to calculate the proper text change.
- *
- * Note: Single text node insertion is handled in {@link #_handleTextNodeInsertion} and text node mutation is handled
- * in {@link #_handleTextMutation}).
- *
- * @private
- * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- * @param {module:engine/view/selection~Selection|null} viewSelection
- */
- _handleContainerChildrenMutations( mutations, viewSelection ) {
- // Get common ancestor of all mutations.
- const mutationsCommonAncestor = getMutationsContainer( mutations );
- // Quit if there is no common ancestor.
- if ( !mutationsCommonAncestor ) {
- return;
- }
- const domConverter = this.editor.editing.view.domConverter;
- // Get common ancestor in DOM.
- const domMutationCommonAncestor = domConverter.mapViewToDom( mutationsCommonAncestor );
- // Create fresh DomConverter so it will not use existing mapping and convert current DOM to model.
- // This wouldn't be needed if DomConverter would allow to create fresh view without checking any mappings.
- const freshDomConverter = new DomConverter( this.editor.editing.view.document );
- const modelFromCurrentDom = this.editor.data.toModel(
- freshDomConverter.domToView( domMutationCommonAncestor )
- ).getChild( 0 );
- // Current model.
- const currentModel = this.editor.editing.mapper.toModelElement( mutationsCommonAncestor );
- // If common ancestor is not mapped, do not do anything. It probably is a parent of another view element.
- // That means that we would need to diff model elements (see `if` below). Better return early instead of
- // trying to get a reasonable model ancestor. It will fell into the `if` below anyway.
- // This situation happens for example for lists. If `<ul>` is a common ancestor, `currentModel` is `undefined`
- // because `<ul>` is not mapped (`<li>`s are).
- // See https://github.com/ckeditor/ckeditor5/issues/718.
- if ( !currentModel ) {
- return;
- }
- // Get children from both ancestors.
- const modelFromDomChildren = Array.from( modelFromCurrentDom.getChildren() );
- const currentModelChildren = Array.from( currentModel.getChildren() );
- // Remove the last `<softBreak>` from the end of `modelFromDomChildren` if there is no `<softBreak>` in current model.
- // If the described scenario happened, it means that this is a bogus `<br />` added by a browser.
- const lastDomChild = modelFromDomChildren[ modelFromDomChildren.length - 1 ];
- const lastCurrentChild = currentModelChildren[ currentModelChildren.length - 1 ];
- if ( lastDomChild && lastDomChild.is( 'softBreak' ) && lastCurrentChild && !lastCurrentChild.is( 'softBreak' ) ) {
- modelFromDomChildren.pop();
- }
- const schema = this.editor.model.schema;
- // Skip situations when common ancestor has any container elements.
- if ( !isSafeForTextMutation( modelFromDomChildren, schema ) || !isSafeForTextMutation( currentModelChildren, schema ) ) {
- return;
- }
- // Replace inserted by the browser with normal space. See comment in `_handleTextMutation`.
- // Replace non-texts with any character. This is potentially dangerous but passes in manual tests. The thing is
- // that we need to take care of proper indexes so we cannot simply remove non-text elements from the content.
- // By inserting a character we keep all the real texts on their indexes.
- const newText = modelFromDomChildren.map( item => item.is( 'text' ) ? item.data : '@' ).join( '' ).replace( /\u00A0/g, ' ' );
- const oldText = currentModelChildren.map( item => item.is( 'text' ) ? item.data : '@' ).join( '' ).replace( /\u00A0/g, ' ' );
- // Do nothing if mutations created same text.
- if ( oldText === newText ) {
- return;
- }
- const diffResult = diff( oldText, newText );
- const { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );
- // Try setting new model selection according to passed view selection.
- let modelSelectionRange = null;
- if ( viewSelection ) {
- modelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );
- }
- const insertText = newText.substr( firstChangeAt, insertions );
- const removeRange = this.editor.model.createRange(
- this.editor.model.createPositionAt( currentModel, firstChangeAt ),
- this.editor.model.createPositionAt( currentModel, firstChangeAt + deletions )
- );
- this.editor.execute( 'input', {
- text: insertText,
- range: removeRange,
- resultRange: modelSelectionRange
- } );
- }
- /**
- * @private
- */
- _handleTextMutation( mutation, viewSelection ) {
- if ( mutation.type != 'text' ) {
- return;
- }
- // Replace inserted by the browser with normal space.
- // We want only normal spaces in the model and in the view. Renderer and DOM Converter will be then responsible
- // for rendering consecutive spaces using , but the model and the view has to be clear.
- // Other feature may introduce inserting non-breakable space on specific key stroke (for example shift + space).
- // However then it will be handled outside of mutations, like enter key is.
- // The replacing is here because it has to be done before `diff` and `diffToChanges` functions, as they
- // take `newText` and compare it to (cleaned up) view.
- // It could also be done in mutation observer too, however if any outside plugin would like to
- // introduce additional events for mutations, they would get already cleaned up version (this may be good or not).
- const newText = mutation.newText.replace( /\u00A0/g, ' ' );
- // To have correct `diffResult`, we also compare view node text data with replaced by space.
- const oldText = mutation.oldText.replace( /\u00A0/g, ' ' );
- // Do nothing if mutations created same text.
- if ( oldText === newText ) {
- return;
- }
- const diffResult = diff( oldText, newText );
- const { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );
- // Try setting new model selection according to passed view selection.
- let modelSelectionRange = null;
- if ( viewSelection ) {
- modelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );
- }
- // Get the position in view and model where the changes will happen.
- const viewPos = this.editing.view.createPositionAt( mutation.node, firstChangeAt );
- const modelPos = this.editing.mapper.toModelPosition( viewPos );
- const removeRange = this.editor.model.createRange( modelPos, modelPos.getShiftedBy( deletions ) );
- const insertText = newText.substr( firstChangeAt, insertions );
- this.editor.execute( 'input', {
- text: insertText,
- range: removeRange,
- resultRange: modelSelectionRange
- } );
- }
- /**
- * @private
- */
- _handleTextNodeInsertion( mutation ) {
- if ( mutation.type != 'children' ) {
- return;
- }
- const change = getSingleTextNodeChange( mutation );
- const viewPos = this.editing.view.createPositionAt( mutation.node, change.index );
- const modelPos = this.editing.mapper.toModelPosition( viewPos );
- const insertedText = change.values[ 0 ].data;
- this.editor.execute( 'input', {
- // Replace inserted by the browser with normal space.
- // See comment in `_handleTextMutation`.
- // In this case we don't need to do this before `diff` because we diff whole nodes.
- // Just change in case there are some.
- text: insertedText.replace( /\u00A0/g, ' ' ),
- range: this.editor.model.createRange( modelPos )
- } );
- }
- }
- // Returns first common ancestor of all mutations that is either {@link module:engine/view/containerelement~ContainerElement}
- // or {@link module:engine/view/rootelement~RootElement}.
- //
- // @private
- // @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- // module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- // @returns {module:engine/view/containerelement~ContainerElement|engine/view/rootelement~RootElement|undefined}
- function getMutationsContainer( mutations ) {
- const lca = mutations
- .map( mutation => mutation.node )
- .reduce( ( commonAncestor, node ) => {
- return commonAncestor.getCommonAncestor( node, { includeSelf: true } );
- } );
- if ( !lca ) {
- return;
- }
- // We need to look for container and root elements only, so check all LCA's
- // ancestors (starting from itself).
- return lca.getAncestors( { includeSelf: true, parentFirst: true } )
- .find( element => element.is( 'containerElement' ) || element.is( 'rootElement' ) );
- }
- // Returns true if provided array contains content that won't be problematic during diffing and text mutation handling.
- //
- // @param {Array.<module:engine/model/node~Node>} children
- // @param {module:engine/model/schema~Schema} schema
- // @returns {Boolean}
- function isSafeForTextMutation( children, schema ) {
- return children.every( child => schema.isInline( child ) );
- }
- // Calculates first change index and number of characters that should be inserted and deleted starting from that index.
- //
- // @private
- // @param diffResult
- // @returns {{insertions: number, deletions: number, firstChangeAt: *}}
- function calculateChanges( diffResult ) {
- // Index where the first change happens. Used to set the position from which nodes will be removed and where will be inserted.
- let firstChangeAt = null;
- // Index where the last change happens. Used to properly count how many characters have to be removed and inserted.
- let lastChangeAt = null;
- // Get `firstChangeAt` and `lastChangeAt`.
- for ( let i = 0; i < diffResult.length; i++ ) {
- const change = diffResult[ i ];
- if ( change != 'equal' ) {
- firstChangeAt = firstChangeAt === null ? i : firstChangeAt;
- lastChangeAt = i;
- }
- }
- // How many characters, starting from `firstChangeAt`, should be removed.
- let deletions = 0;
- // How many characters, starting from `firstChangeAt`, should be inserted.
- let insertions = 0;
- for ( let i = firstChangeAt; i <= lastChangeAt; i++ ) {
- // If there is no change (equal) or delete, the character is existing in `oldText`. We count it for removing.
- if ( diffResult[ i ] != 'insert' ) {
- deletions++;
- }
- // If there is no change (equal) or insert, the character is existing in `newText`. We count it for inserting.
- if ( diffResult[ i ] != 'delete' ) {
- insertions++;
- }
- }
- return { insertions, deletions, firstChangeAt };
- }
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