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- /**
- * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module engine/model/utils/insertcontent
- */
- import Position from '../position';
- import LivePosition from '../liveposition';
- import Element from '../element';
- import Range from '../range';
- import log from '@ckeditor/ckeditor5-utils/src/log';
- import DocumentSelection from '../documentselection';
- /**
- * Inserts content into the editor (specified selection) as one would expect the paste
- * functionality to work.
- *
- * **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~Selection|module:engine/model/documentselection~DocumentSelection} selection
- * Selection into which the content should be inserted.
- */
- export default function insertContent( model, content, selection ) {
- model.change( writer => {
- if ( !selection.isCollapsed ) {
- model.deleteContent( selection );
- }
- const insertion = new Insertion( model, writer, selection.anchor );
- let nodesToInsert;
- if ( content.is( 'documentFragment' ) ) {
- nodesToInsert = content.getChildren();
- } else {
- nodesToInsert = [ content ];
- }
- insertion.handleNodes( nodesToInsert, {
- // The set of children being inserted is the only set in this context
- // so it's the first and last (it's a hack ;)).
- isFirst: true,
- isLast: true
- } );
- 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.
- /**
- * Cannot determine a proper selection range after insertion.
- *
- * @warning insertcontent-no-range
- */
- log.warn( 'insertcontent-no-range: Cannot determine a proper selection range after insertion.' );
- }
- } );
- }
- /**
- * 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 deltas 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;
- this._filterAttributesOf = [];
- }
- /**
- * Handles insertion of a set of nodes.
- *
- * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to insert.
- * @param {Object} parentContext Context in which parent of these nodes was supposed to be inserted.
- * If the parent context is passed it means that the parent element was stripped (was not allowed).
- */
- handleNodes( nodes, parentContext ) {
- nodes = Array.from( nodes );
- for ( let i = 0; i < nodes.length; i++ ) {
- const node = nodes[ i ];
- this._handleNode( node, {
- isFirst: i === 0 && parentContext.isFirst,
- isLast: ( i === ( nodes.length - 1 ) ) && parentContext.isLast
- } );
- }
- // TMP this will become a postfixer.
- this.schema.removeDisallowedAttributes( this._filterAttributesOf, this.writer );
- this._filterAttributesOf = [];
- }
- /**
- * 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.document.getNearestSelectionRange( this.position );
- }
- /**
- * Handles insertion of a single node.
- *
- * @param {module:engine/model/node~Node} node
- * @param {Object} context
- * @param {Boolean} context.isFirst Whether the given node is the first one in the content to be inserted.
- * @param {Boolean} context.isLast Whether the given node is the last one in the content to be inserted.
- */
- _handleNode( node, context ) {
- // 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, context );
- return;
- }
- // Try to find a place for the given node.
- // 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.
- const isAllowed = this._checkAndSplitToAllowedPosition( node, context );
- if ( !isAllowed ) {
- this._handleDisallowedNode( node, context );
- return;
- }
- this._insert( node );
- // After the node was inserted we may try to merge it with its siblings.
- // This should happen only if it was the first and/or last of the nodes (so only with boundary nodes)
- // and only if the selection was in those elements initially.
- //
- // E.g.:
- // <p>x^</p> + <p>y</p> => <p>x</p><p>y</p> => <p>xy[]</p>
- // and:
- // <p>x^y</p> + <p>z</p> => <p>x</p>^<p>y</p> + <p>z</p> => <p>x</p><p>y</p><p>z</p> => <p>xy[]z</p>
- // but:
- // <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>y</p><p>z</p> (no merging, note: after running deletetContents
- // it's exactly the same case as above)
- this._mergeSiblingsOf( node, context );
- }
- /**
- * @param {module:engine/model/element~Element} node The object element.
- * @param {Object} context
- */
- _handleObject( node, context ) {
- // Try finding it a place in the tree.
- if ( this._checkAndSplitToAllowedPosition( node ) ) {
- this._insert( node );
- }
- // Try autoparagraphing.
- else {
- this._tryAutoparagraphing( node, context );
- }
- }
- /**
- * @param {module:engine/model/node~Node} node The disallowed node which needs to be handled.
- * @param {Object} context
- */
- _handleDisallowedNode( node, context ) {
- // If the node is an element, try inserting its children (strip the parent).
- if ( node.is( 'element' ) ) {
- this.handleNodes( node.getChildren(), context );
- }
- // If text is not allowed, try autoparagraphing it.
- else {
- this._tryAutoparagraphing( node, context );
- }
- }
- /**
- * @param {module:engine/model/node~Node} node The node to insert.
- */
- _insert( 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.
- log.error(
- 'insertcontent-wrong-position: The node cannot be inserted on the given position.',
- { node, position: this.position }
- );
- return;
- }
- const livePos = LivePosition.createFromPosition( this.position );
- this.writer.insert( node, this.position );
- this.position = Position.createFromPosition( livePos );
- livePos.detach();
- // 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 );
- }
- /**
- * @param {module:engine/model/node~Node} node The node which could potentially be merged.
- * @param {Object} context
- */
- _mergeSiblingsOf( node, context ) {
- if ( !( node instanceof Element ) ) {
- return;
- }
- const mergeLeft = context.isFirst && ( node.previousSibling instanceof Element ) && this.canMergeWith.has( node.previousSibling );
- const mergeRight = context.isLast && ( node.nextSibling instanceof Element ) && this.canMergeWith.has( node.nextSibling );
- const mergePosLeft = LivePosition.createBefore( node );
- const mergePosRight = LivePosition.createAfter( node );
- if ( mergeLeft ) {
- const position = LivePosition.createFromPosition( this.position );
- this.writer.merge( mergePosLeft );
- this.position = Position.createFromPosition( position );
- position.detach();
- }
- if ( mergeRight ) {
- /* 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.
- log.error( 'insertcontent-wrong-position-on-merge: The insertion position should equal the merge position' );
- }
- // 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' );
- // 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 position = new LivePosition( this.position.root, this.position.path, 'sticksToPrevious' );
- this.writer.merge( mergePosRight );
- this.position = Position.createFromPosition( position );
- position.detach();
- }
- if ( mergeLeft || mergeRight ) {
- // 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();
- mergePosRight.detach();
- }
- /**
- * Tries wrapping the node in a new paragraph and inserting it this way.
- *
- * @param {module:engine/model/node~Node} node The node which needs to be autoparagraphed.
- * @param {Object} context
- */
- _tryAutoparagraphing( node, context ) {
- 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.appendChildren( node );
- this._handleNode( paragraph, context );
- }
- }
- /**
- * @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;
- }
- 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 ) {
- const parent = this.position.parent;
- this.position = Position.createBefore( parent );
- // Special case – parent is empty (<p>^</p>) so isAtStart == isAtEnd == true.
- // We can remove the element after moving selection out of it.
- if ( parent.isEmpty ) {
- this.writer.remove( parent );
- }
- } else if ( this.position.isAtEnd ) {
- this.position = Position.createAfter( this.position.parent );
- } else {
- const tempPos = Position.createAfter( this.position.parent );
- 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.
- *
- * @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;
- }
- }
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