@steroidsjs/ckeditor5
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The development environment of CKEditor 5 – the best browser-based rich text editor.
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JavaScript
/**
* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module engine/model/utils/insertcontent
*/
import Position from '../position';
import LivePosition from '../liveposition';
import Element from '../element';
import Range from '../range';
import DocumentSelection from '../documentselection';
import Selection from '../selection';
import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
/**
* Inserts content into the editor (specified selection) as one would expect the paste functionality to work.
*
* It takes care of removing the selected content, splitting elements (if needed), inserting elements and merging elements appropriately.
*
* Some examples:
*
* <p>x^</p> + <p>y</p> => <p>x</p><p>y</p> => <p>xy[]</p>
* <p>x^y</p> + <p>z</p> => <p>x</p>^<p>y</p> + <p>z</p> => <p>x</p><p>z</p><p>y</p> => <p>xz[]y</p>
* <p>x^y</p> + <img /> => <p>x</p>^<p>y</p> + <img /> => <p>x</p><img /><p>y</p>
* <p>x</p><p>^</p><p>z</p> + <p>y</p> => <p>x</p><p>y[]</p><p>z</p> (no merging)
* <p>x</p>[<img />]<p>z</p> + <p>y</p> => <p>x</p>^<p>z</p> + <p>y</p> => <p>x</p><p>y[]</p><p>z</p>
*
* If an instance of {@link module:engine/model/selection~Selection} is passed as `selectable` it will be modified
* to the insertion selection (equal to a range to be selected after insertion).
*
* If `selectable` is not passed, the content will be inserted using the current selection of the model document.
*
* **Note:** Use {@link module:engine/model/model~Model#insertContent} instead of this function.
* This function is only exposed to be reusable in algorithms which change the {@link module:engine/model/model~Model#insertContent}
* method's behavior.
*
* @param {module:engine/model/model~Model} model The model in context of which the insertion
* should be performed.
* @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.
* @param {module:engine/model/selection~Selectable} [selectable=model.document.selection]
* Selection into which the content should be inserted.
* @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.
* @returns {module:engine/model/range~Range} Range which contains all the performed changes. This is a range that, if removed,
* would return the model to the state before the insertion. If no changes were preformed by `insertContent`, returns a range collapsed
* at the insertion position.
*/
export default function insertContent( model, content, selectable, placeOrOffset ) {
return model.change( writer => {
let selection;
if ( !selectable ) {
selection = model.document.selection;
} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {
selection = selectable;
} else {
selection = writer.createSelection( selectable, placeOrOffset );
}
if ( !selection.isCollapsed ) {
model.deleteContent( selection, { doNotAutoparagraph: true } );
}
const insertion = new Insertion( model, writer, selection.anchor );
let nodesToInsert;
if ( content.is( 'documentFragment' ) ) {
nodesToInsert = content.getChildren();
} else {
nodesToInsert = [ content ];
}
insertion.handleNodes( nodesToInsert );
const newRange = insertion.getSelectionRange();
/* istanbul ignore else */
if ( newRange ) {
if ( selection instanceof DocumentSelection ) {
writer.setSelection( newRange );
} else {
selection.setTo( newRange );
}
} else {
// We are not testing else because it's a safe check for unpredictable edge cases:
// an insertion without proper range to select.
//
// @if CK_DEBUG // console.warn( 'Cannot determine a proper selection range after insertion.' );
}
const affectedRange = insertion.getAffectedRange() || model.createRange( selection.anchor );
insertion.destroy();
return affectedRange;
} );
}
/**
* Utility class for performing content insertion.
*
* @private
*/
class Insertion {
constructor( model, writer, position ) {
/**
* The model in context of which the insertion should be performed.
*
* @member {module:engine/model~Model} #model
*/
this.model = model;
/**
* Batch to which operations will be added.
*
* @member {module:engine/controller/writer~Batch} #writer
*/
this.writer = writer;
/**
* The position at which (or near which) the next node will be inserted.
*
* @member {module:engine/model/position~Position} #position
*/
this.position = position;
/**
* Elements with which the inserted elements can be merged.
*
* <p>x^</p><p>y</p> + <p>z</p> (can merge to <p>x</p>)
* <p>x</p><p>^y</p> + <p>z</p> (can merge to <p>y</p>)
* <p>x^y</p> + <p>z</p> (can merge to <p>xy</p> which will be split during the action,
* so both its pieces will be added to this set)
*
*
* @member {Set} #canMergeWith
*/
this.canMergeWith = new Set( [ this.position.parent ] );
/**
* Schema of the model.
*
* @member {module:engine/model/schema~Schema} #schema
*/
this.schema = model.schema;
/**
* The temporary DocumentFragment used for grouping multiple nodes for single insert operation.
*
* @private
* @type {module:engine/model/documentfragment~DocumentFragment}
*/
this._documentFragment = writer.createDocumentFragment();
/**
* The current position in the temporary DocumentFragment.
*
* @private
* @type {module:engine/model/position~Position}
*/
this._documentFragmentPosition = writer.createPositionAt( this._documentFragment, 0 );
/**
* The reference to the first inserted node.
*
* @private
* @type {module:engine/model/node~Node}
*/
this._firstNode = null;
/**
* The reference to the last inserted node.
*
* @private
* @type {module:engine/model/node~Node}
*/
this._lastNode = null;
/**
* The reference to the last auto paragraph node.
*
* @private
* @type {module:engine/model/node~Node}
*/
this._lastAutoParagraph = null;
/**
* The array of nodes that should be cleaned of not allowed attributes.
*
* @private
* @type {Array.<module:engine/model/node~Node>}
*/
this._filterAttributesOf = [];
/**
* Beginning of the affected range. See {@link module:engine/model/utils/insertcontent~Insertion#getAffectedRange}.
*
* @private
* @member {module:engine/model/liveposition~LivePosition|null} #_affectedStart
*/
this._affectedStart = null;
/**
* End of the affected range. See {@link module:engine/model/utils/insertcontent~Insertion#getAffectedRange}.
*
* @private
* @member {module:engine/model/liveposition~LivePosition|null} #_affectedEnd
*/
this._affectedEnd = null;
}
/**
* Handles insertion of a set of nodes.
*
* @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to insert.
*/
handleNodes( nodes ) {
for ( const node of Array.from( nodes ) ) {
this._handleNode( node );
}
// Insert nodes collected in temporary DocumentFragment.
this._insertPartialFragment();
// If there was an auto paragraph then we might need to adjust the end of insertion.
if ( this._lastAutoParagraph ) {
this._updateLastNodeFromAutoParagraph( this._lastAutoParagraph );
}
// After the content was inserted we may try to merge it with its next sibling if the selection was in it initially.
// Merging with the previous sibling was performed just after inserting the first node to the document.
this._mergeOnRight();
// TMP this will become a post-fixer.
this.schema.removeDisallowedAttributes( this._filterAttributesOf, this.writer );
this._filterAttributesOf = [];
}
/**
* Updates the last node after the auto paragraphing.
*
* @private
* @param {module:engine/model/node~Node} node The last auto paragraphing node.
*/
_updateLastNodeFromAutoParagraph( node ) {
const positionAfterLastNode = this.writer.createPositionAfter( this._lastNode );
const positionAfterNode = this.writer.createPositionAfter( node );
// If the real end was after the last auto paragraph then update relevant properties.
if ( positionAfterNode.isAfter( positionAfterLastNode ) ) {
this._lastNode = node;
/* istanbul ignore if */
if ( this.position.parent != node || !this.position.isAtEnd ) {
// Algorithm's correctness check. We should never end up here but it's good to know that we did.
// At this point the insertion position should be at the end of the last auto paragraph.
// Note: This error is documented in other place in this file.
throw new CKEditorError( 'insertcontent-invalid-insertion-position', this );
}
this.position = positionAfterNode;
this._setAffectedBoundaries( this.position );
}
}
/**
* Returns range to be selected after insertion.
* Returns `null` if there is no valid range to select after insertion.
*
* @returns {module:engine/model/range~Range|null}
*/
getSelectionRange() {
if ( this.nodeToSelect ) {
return Range._createOn( this.nodeToSelect );
}
return this.model.schema.getNearestSelectionRange( this.position );
}
/**
* Returns a range which contains all the performed changes. This is a range that, if removed, would return the model to the state
* before the insertion. Returns `null` if no changes were done.
*
* @returns {module:engine/model/range~Range|null}
*/
getAffectedRange() {
if ( !this._affectedStart ) {
return null;
}
return new Range( this._affectedStart, this._affectedEnd );
}
/**
* Destroys `Insertion` instance.
*/
destroy() {
if ( this._affectedStart ) {
this._affectedStart.detach();
}
if ( this._affectedEnd ) {
this._affectedEnd.detach();
}
}
/**
* Handles insertion of a single node.
*
* @private
* @param {module:engine/model/node~Node} node
*/
_handleNode( node ) {
// Let's handle object in a special way.
// * They should never be merged with other elements.
// * If they are not allowed in any of the selection ancestors, they could be either autoparagraphed or totally removed.
if ( this.schema.isObject( node ) ) {
this._handleObject( node );
return;
}
// Try to find a place for the given node.
// Check if a node can be inserted in the given position or it would be accepted if a paragraph would be inserted.
// Inserts the auto paragraph if it would allow for insertion.
let isAllowed = this._checkAndAutoParagraphToAllowedPosition( node );
if ( !isAllowed ) {
// Split the position.parent's branch up to a point where the node can be inserted.
// If it isn't allowed in the whole branch, then of course don't split anything.
isAllowed = this._checkAndSplitToAllowedPosition( node );
if ( !isAllowed ) {
this._handleDisallowedNode( node );
return;
}
}
// Add node to the current temporary DocumentFragment.
this._appendToFragment( node );
// Store the first and last nodes for easy access for merging with sibling nodes.
if ( !this._firstNode ) {
this._firstNode = node;
}
this._lastNode = node;
}
/**
* Inserts the temporary DocumentFragment into the model.
*
* @private
*/
_insertPartialFragment() {
if ( this._documentFragment.isEmpty ) {
return;
}
const livePosition = LivePosition.fromPosition( this.position, 'toNext' );
this._setAffectedBoundaries( this.position );
// If the very first node of the whole insertion process is inserted, insert it separately for OT reasons (undo).
// Note: there can be multiple calls to `_insertPartialFragment()` during one insertion process.
// Note: only the very first node can be merged so we have to do separate operation only for it.
if ( this._documentFragment.getChild( 0 ) == this._firstNode ) {
this.writer.insert( this._firstNode, this.position );
// We must merge the first node just after inserting it to avoid problems with OT.
// (See: https://github.com/ckeditor/ckeditor5/pull/8773#issuecomment-760945652).
this._mergeOnLeft();
this.position = livePosition.toPosition();
}
// Insert the remaining nodes from document fragment.
if ( !this._documentFragment.isEmpty ) {
this.writer.insert( this._documentFragment, this.position );
}
this._documentFragmentPosition = this.writer.createPositionAt( this._documentFragment, 0 );
this.position = livePosition.toPosition();
livePosition.detach();
}
/**
* @private
* @param {module:engine/model/element~Element} node The object element.
*/
_handleObject( node ) {
// Try finding it a place in the tree.
if ( this._checkAndSplitToAllowedPosition( node ) ) {
this._appendToFragment( node );
}
// Try autoparagraphing.
else {
this._tryAutoparagraphing( node );
}
}
/**
* @private
* @param {module:engine/model/node~Node} node The disallowed node which needs to be handled.
*/
_handleDisallowedNode( node ) {
// If the node is an element, try inserting its children (strip the parent).
if ( node.is( 'element' ) ) {
this.handleNodes( node.getChildren() );
}
// If text is not allowed, try autoparagraphing it.
else {
this._tryAutoparagraphing( node );
}
}
/**
* Append a node to the temporary DocumentFragment.
*
* @private
* @param {module:engine/model/node~Node} node The node to insert.
*/
_appendToFragment( node ) {
/* istanbul ignore if */
if ( !this.schema.checkChild( this.position, node ) ) {
// Algorithm's correctness check. We should never end up here but it's good to know that we did.
// Note that it would often be a silent issue if we insert node in a place where it's not allowed.
/**
* Given node cannot be inserted on the given position.
*
* @error insertcontent-wrong-position
* @param {module:engine/model/node~Node} node Node to insert.
* @param {module:engine/model/position~Position} position Position to insert the node at.
*/
throw new CKEditorError(
'insertcontent-wrong-position',
this,
{ node, position: this.position }
);
}
this.writer.insert( node, this._documentFragmentPosition );
this._documentFragmentPosition = this._documentFragmentPosition.getShiftedBy( node.offsetSize );
// The last inserted object should be selected because we can't put a collapsed selection after it.
if ( this.schema.isObject( node ) && !this.schema.checkChild( this.position, '$text' ) ) {
this.nodeToSelect = node;
} else {
this.nodeToSelect = null;
}
this._filterAttributesOf.push( node );
}
/**
* Sets `_affectedStart` and `_affectedEnd` to the given `position`. Should be used before a change is done during insertion process to
* mark the affected range.
*
* This method is used before inserting a node or splitting a parent node. `_affectedStart` and `_affectedEnd` are also changed
* during merging, but the logic there is more complicated so it is left out of this function.
*
* @private
* @param {module:engine/model/position~Position} position
*/
_setAffectedBoundaries( position ) {
// Set affected boundaries stickiness so that those position will "expand" when something is inserted in between them:
// <paragraph>Foo][bar</paragraph> -> <paragraph>Foo]xx[bar</paragraph>
// This is why it cannot be a range but two separate positions.
if ( !this._affectedStart ) {
this._affectedStart = LivePosition.fromPosition( position, 'toPrevious' );
}
// If `_affectedEnd` is before the new boundary position, expand `_affectedEnd`. This can happen if first inserted node was
// inserted into the parent but the next node is moved-out of that parent:
// (1) <paragraph>Foo][</paragraph> -> <paragraph>Foo]xx[</paragraph>
// (2) <paragraph>Foo]xx[</paragraph> -> <paragraph>Foo]xx</paragraph><widget></widget>[
if ( !this._affectedEnd || this._affectedEnd.isBefore( position ) ) {
if ( this._affectedEnd ) {
this._affectedEnd.detach();
}
this._affectedEnd = LivePosition.fromPosition( position, 'toNext' );
}
}
/**
* Merges the previous sibling of the first node if it should be merged.
*
* After the content was inserted we may try to merge it with its siblings.
* This should happen only if the selection was in those elements initially.
*
* @private
*/
_mergeOnLeft() {
const node = this._firstNode;
if ( !( node instanceof Element ) ) {
return;
}
if ( !this._canMergeLeft( node ) ) {
return;
}
const mergePosLeft = LivePosition._createBefore( node );
mergePosLeft.stickiness = 'toNext';
const livePosition = LivePosition.fromPosition( this.position, 'toNext' );
// If `_affectedStart` is sames as merge position, it means that the element "marked" by `_affectedStart` is going to be
// removed and its contents will be moved. This won't transform `LivePosition` so `_affectedStart` needs to be moved
// by hand to properly reflect affected range. (Due to `_affectedStart` and `_affectedEnd` stickiness, the "range" is
// shown as `][`).
//
// Example - insert `<paragraph>Abc</paragraph><paragraph>Xyz</paragraph>` at the end of `<paragraph>Foo^</paragraph>`:
//
// <paragraph>Foo</paragraph><paragraph>Bar</paragraph> -->
// <paragraph>Foo</paragraph>]<paragraph>Abc</paragraph><paragraph>Xyz</paragraph>[<paragraph>Bar</paragraph> -->
// <paragraph>Foo]Abc</paragraph><paragraph>Xyz</paragraph>[<paragraph>Bar</paragraph>
//
// Note, that if we are here then something must have been inserted, so `_affectedStart` and `_affectedEnd` have to be set.
if ( this._affectedStart.isEqual( mergePosLeft ) ) {
this._affectedStart.detach();
this._affectedStart = LivePosition._createAt( mergePosLeft.nodeBefore, 'end', 'toPrevious' );
}
// We need to update the references to the first and last nodes if they will be merged into the previous sibling node
// because the reference would point to the removed node.
//
// <p>A^A</p> + <p>X</p>
//
// <p>A</p>^<p>A</p>
// <p>A</p><p>X</p><p>A</p>
// <p>AX</p><p>A</p>
// <p>AXA</p>
if ( this._firstNode === this._lastNode ) {
this._firstNode = mergePosLeft.nodeBefore;
this._lastNode = mergePosLeft.nodeBefore;
}
this.writer.merge( mergePosLeft );
// If only one element (the merged one) is in the "affected range", also move the affected range end appropriately.
//
// Example - insert `<paragraph>Abc</paragraph>` at the of `<paragraph>Foo^</paragraph>`:
//
// <paragraph>Foo</paragraph><paragraph>Bar</paragraph> -->
// <paragraph>Foo</paragraph>]<paragraph>Abc</paragraph>[<paragraph>Bar</paragraph> -->
// <paragraph>Foo]Abc</paragraph>[<paragraph>Bar</paragraph> -->
// <paragraph>Foo]Abc[</paragraph><paragraph>Bar</paragraph>
if ( mergePosLeft.isEqual( this._affectedEnd ) && this._firstNode === this._lastNode ) {
this._affectedEnd.detach();
this._affectedEnd = LivePosition._createAt( mergePosLeft.nodeBefore, 'end', 'toNext' );
}
this.position = livePosition.toPosition();
livePosition.detach();
// After merge elements that were marked by _insert() to be filtered might be gone so
// we need to mark the new container.
this._filterAttributesOf.push( this.position.parent );
mergePosLeft.detach();
}
/**
* Merges the next sibling of the last node if it should be merged.
*
* After the content was inserted we may try to merge it with its siblings.
* This should happen only if the selection was in those elements initially.
*
* @private
*/
_mergeOnRight() {
const node = this._lastNode;
if ( !( node instanceof Element ) ) {
return;
}
if ( !this._canMergeRight( node ) ) {
return;
}
const mergePosRight = LivePosition._createAfter( node );
mergePosRight.stickiness = 'toNext';
/* istanbul ignore if */
if ( !this.position.isEqual( mergePosRight ) ) {
// Algorithm's correctness check. We should never end up here but it's good to know that we did.
// At this point the insertion position should be after the node we'll merge. If it isn't,
// it should need to be secured as in the left merge case.
/**
* An internal error occurred when merging inserted content with its siblings.
* The insertion position should equal the merge position.
*
* If you encountered this error, report it back to the CKEditor 5 team
* with as many details as possible regarding the content being inserted and the insertion position.
*
* @error insertcontent-invalid-insertion-position
*/
throw new CKEditorError( 'insertcontent-invalid-insertion-position', this );
}
// Move the position to the previous node, so it isn't moved to the graveyard on merge.
// <p>x</p>[]<p>y</p> => <p>x[]</p><p>y</p>
this.position = Position._createAt( mergePosRight.nodeBefore, 'end' );
// Explanation of setting position stickiness to `'toPrevious'`:
// OK: <p>xx[]</p> + <p>yy</p> => <p>xx[]yy</p> (when sticks to previous)
// NOK: <p>xx[]</p> + <p>yy</p> => <p>xxyy[]</p> (when sticks to next)
const livePosition = LivePosition.fromPosition( this.position, 'toPrevious' );
// See comment in `_mergeOnLeft()` on moving `_affectedStart`.
if ( this._affectedEnd.isEqual( mergePosRight ) ) {
this._affectedEnd.detach();
this._affectedEnd = LivePosition._createAt( mergePosRight.nodeBefore, 'end', 'toNext' );
}
// We need to update the references to the first and last nodes if they will be merged into the previous sibling node
// because the reference would point to the removed node.
//
// <p>A^A</p> + <p>X</p>
//
// <p>A</p>^<p>A</p>
// <p>A</p><p>X</p><p>A</p>
// <p>AX</p><p>A</p>
// <p>AXA</p>
if ( this._firstNode === this._lastNode ) {
this._firstNode = mergePosRight.nodeBefore;
this._lastNode = mergePosRight.nodeBefore;
}
this.writer.merge( mergePosRight );
// See comment in `_mergeOnLeft()` on moving `_affectedStart`.
if ( mergePosRight.getShiftedBy( -1 ).isEqual( this._affectedStart ) && this._firstNode === this._lastNode ) {
this._affectedStart.detach();
this._affectedStart = LivePosition._createAt( mergePosRight.nodeBefore, 0, 'toPrevious' );
}
this.position = livePosition.toPosition();
livePosition.detach();
// After merge elements that were marked by _insert() to be filtered might be gone so
// we need to mark the new container.
this._filterAttributesOf.push( this.position.parent );
mergePosRight.detach();
}
/**
* Checks whether specified node can be merged with previous sibling element.
*
* @private
* @param {module:engine/model/node~Node} node The node which could potentially be merged.
* @returns {Boolean}
*/
_canMergeLeft( node ) {
const previousSibling = node.previousSibling;
return ( previousSibling instanceof Element ) &&
this.canMergeWith.has( previousSibling ) &&
this.model.schema.checkMerge( previousSibling, node );
}
/**
* Checks whether specified node can be merged with next sibling element.
*
* @private
* @param {module:engine/model/node~Node} node The node which could potentially be merged.
* @returns {Boolean}
*/
_canMergeRight( node ) {
const nextSibling = node.nextSibling;
return ( nextSibling instanceof Element ) &&
this.canMergeWith.has( nextSibling ) &&
this.model.schema.checkMerge( node, nextSibling );
}
/**
* Tries wrapping the node in a new paragraph and inserting it this way.
*
* @private
* @param {module:engine/model/node~Node} node The node which needs to be autoparagraphed.
*/
_tryAutoparagraphing( node ) {
const paragraph = this.writer.createElement( 'paragraph' );
// Do not autoparagraph if the paragraph won't be allowed there,
// cause that would lead to an infinite loop. The paragraph would be rejected in
// the next _handleNode() call and we'd be here again.
if ( this._getAllowedIn( paragraph, this.position.parent ) && this.schema.checkChild( paragraph, node ) ) {
paragraph._appendChild( node );
this._handleNode( paragraph );
}
}
/**
* Checks if a node can be inserted in the given position or it would be accepted if a paragraph would be inserted.
* It also handles inserting the paragraph.
*
* @private
* @param {module:engine/model/node~Node} node The node.
* @returns {Boolean} Whether an allowed position was found.
* `false` is returned if the node isn't allowed at the current position or in auto paragraph, `true` if was.
*/
_checkAndAutoParagraphToAllowedPosition( node ) {
if ( this.schema.checkChild( this.position.parent, node ) ) {
return true;
}
// Do not auto paragraph if the paragraph won't be allowed there,
// cause that would lead to an infinite loop. The paragraph would be rejected in
// the next _handleNode() call and we'd be here again.
if ( !this.schema.checkChild( this.position.parent, 'paragraph' ) || !this.schema.checkChild( 'paragraph', node ) ) {
return false;
}
// Insert nodes collected in temporary DocumentFragment if the position parent needs change to process further nodes.
this._insertPartialFragment();
// Insert a paragraph and move insertion position to it.
const paragraph = this.writer.createElement( 'paragraph' );
this.writer.insert( paragraph, this.position );
this._setAffectedBoundaries( this.position );
this._lastAutoParagraph = paragraph;
this.position = this.writer.createPositionAt( paragraph, 0 );
return true;
}
/**
* @private
* @param {module:engine/model/node~Node} node
* @returns {Boolean} Whether an allowed position was found.
* `false` is returned if the node isn't allowed at any position up in the tree, `true` if was.
*/
_checkAndSplitToAllowedPosition( node ) {
const allowedIn = this._getAllowedIn( node, this.position.parent );
if ( !allowedIn ) {
return false;
}
// Insert nodes collected in temporary DocumentFragment if the position parent needs change to process further nodes.
if ( allowedIn != this.position.parent ) {
this._insertPartialFragment();
}
while ( allowedIn != this.position.parent ) {
// If a parent which we'd need to leave is a limit element, break.
if ( this.schema.isLimit( this.position.parent ) ) {
return false;
}
if ( this.position.isAtStart ) {
// If insertion position is at the beginning of the parent, move it out instead of splitting.
// <p>^Foo</p> -> ^<p>Foo</p>
const parent = this.position.parent;
this.position = this.writer.createPositionBefore( parent );
// Special case – parent is empty (<p>^</p>).
//
// 1. parent.isEmpty
// We can remove the element after moving insertion position out of it.
//
// 2. parent.parent === allowedIn
// However parent should remain in place when allowed element is above limit element in document tree.
// For example there shouldn't be allowed to remove empty paragraph from tableCell, when is pasted
// content allowed in $root.
if ( parent.isEmpty && parent.parent === allowedIn ) {
this.writer.remove( parent );
}
} else if ( this.position.isAtEnd ) {
// If insertion position is at the end of the parent, move it out instead of splitting.
// <p>Foo^</p> -> <p>Foo</p>^
this.position = this.writer.createPositionAfter( this.position.parent );
} else {
const tempPos = this.writer.createPositionAfter( this.position.parent );
this._setAffectedBoundaries( this.position );
this.writer.split( this.position );
this.position = tempPos;
this.canMergeWith.add( this.position.nodeAfter );
}
}
return true;
}
/**
* Gets the element in which the given node is allowed. It checks the passed element and all its ancestors.
*
* @private
* @param {module:engine/model/node~Node} node The node to check.
* @param {module:engine/model/element~Element} element The element in which the node's correctness should be checked.
* @returns {module:engine/model/element~Element|null}
*/
_getAllowedIn( node, element ) {
if ( this.schema.checkChild( element, node ) ) {
return element;
}
if ( element.parent ) {
return this._getAllowedIn( node, element.parent );
}
return null;
}
}