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- /**
- * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module module:engine/view/writer
- */
- import Position from './position';
- import ContainerElement from './containerelement';
- import AttributeElement from './attributeelement';
- import EmptyElement from './emptyelement';
- import UIElement from './uielement';
- import Text from './text';
- import Range from './range';
- import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
- import DocumentFragment from './documentfragment';
- import isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';
- /**
- * Contains functions used for composing view tree.
- *
- * @namespace writer
- */
- const writer = {
- breakAttributes,
- breakContainer,
- mergeAttributes,
- mergeContainers,
- insert,
- remove,
- clear,
- move,
- wrap,
- wrapPosition,
- unwrap,
- rename
- };
- export default writer;
- /**
- * Breaks attribute nodes at provided position or at boundaries of provided range. It breaks attribute elements inside
- * up to a container element.
- *
- * In following examples `<p>` is a container, `<b>` and `<u>` are attribute nodes:
- *
- * <p>foo<b><u>bar{}</u></b></p> -> <p>foo<b><u>bar</u></b>[]</p>
- * <p>foo<b><u>{}bar</u></b></p> -> <p>foo{}<b><u>bar</u></b></p>
- * <p>foo<b><u>b{}ar</u></b></p> -> <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>
- * <p><b>fo{o</b><u>ba}r</u></p> -> <p><b>fo</b><b>o</b><u>ba</u><u>r</u></b></p>
- *
- * **Note:** {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.
- *
- * **Note:** Difference between {@link module:engine/view/writer~writer.breakAttributes breakAttributes} and
- * {@link module:engine/view/writer~writer.breakContainer breakContainer} is that `breakAttributes` breaks all
- * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`, up to the first
- * encountered {@link module:engine/view/containerelement~ContainerElement container element}. `breakContainer` assumes that given
- * `position`
- * is directly in container element and breaks that container element.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container`
- * when {@link module:engine/view/range~Range#start start}
- * and {@link module:engine/view/range~Range#end end} positions of a passed range are not placed inside same parent container.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element`
- * when trying to break attributes
- * inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element`
- * when trying to break attributes
- * inside {@link module:engine/view/uielement~UIElement UIElement}.
- *
- * @see module:engine/view/attributeelement~AttributeElement
- * @see module:engine/view/containerelement~ContainerElement
- * @see module:engine/view/writer~writer.breakContainer
- * @function module:engine/view/writer~writer.breakAttributes
- * @param {module:engine/view/position~Position|module:engine/view/range~Range} positionOrRange Position where to break attribute elements.
- * @returns {module:engine/view/position~Position|module:engine/view/range~Range} New position or range, after breaking the attribute
- * elements.
- */
- export function breakAttributes( positionOrRange ) {
- if ( positionOrRange instanceof Position ) {
- return _breakAttributes( positionOrRange );
- } else {
- return _breakAttributesRange( positionOrRange );
- }
- }
- /**
- * Breaks {@link module:engine/view/containerelement~ContainerElement container view element} into two, at the given position. Position
- * has to be directly inside container element and cannot be in root. Does not break if position is at the beginning
- * or at the end of it's parent element.
- *
- * <p>foo^bar</p> -> <p>foo</p><p>bar</p>
- * <div><p>foo</p>^<p>bar</p></div> -> <div><p>foo</p></div><div><p>bar</p></div>
- * <p>^foobar</p> -> ^<p>foobar</p>
- * <p>foobar^</p> -> <p>foobar</p>^
- *
- * **Note:** Difference between {@link module:engine/view/writer~writer.breakAttributes breakAttributes} and
- * {@link module:engine/view/writer~writer.breakContainer breakContainer} is that `breakAttributes` breaks all
- * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`, up to the first
- * encountered {@link module:engine/view/containerelement~ContainerElement container element}. `breakContainer` assumes that given
- * `position`
- * is directly in container element and breaks that container element.
- *
- * @see module:engine/view/attributeelement~AttributeElement
- * @see module:engine/view/containerelement~ContainerElement
- * @see module:engine/view/writer~writer.breakAttributes
- * @function module:engine/view/writer~writer.breakContainer
- * @param {module:engine/view/position~Position} position Position where to break element.
- * @returns {module:engine/view/position~Position} Position between broken elements. If element has not been broken, the returned position
- * is placed either before it or after it.
- */
- export function breakContainer( position ) {
- const element = position.parent;
- if ( !( element.is( 'containerElement' ) ) ) {
- /**
- * Trying to break an element which is not a container element.
- *
- * @error view-writer-break-non-container-element
- */
- throw new CKEditorError( 'view-writer-break-non-container-element: Trying to break an element which is not a container element.' );
- }
- if ( !element.parent ) {
- /**
- * Trying to break root element.
- *
- * @error view-writer-break-root
- */
- throw new CKEditorError( 'view-writer-break-root: Trying to break root element.' );
- }
- if ( position.isAtStart ) {
- return Position.createBefore( element );
- } else if ( !position.isAtEnd ) {
- const newElement = element.clone( false );
- insert( Position.createAfter( element ), newElement );
- const sourceRange = new Range( position, Position.createAt( element, 'end' ) );
- const targetPosition = new Position( newElement, 0 );
- move( sourceRange, targetPosition );
- }
- return Position.createAfter( element );
- }
- /**
- * Merges {@link module:engine/view/attributeelement~AttributeElement attribute elements}. It also merges text nodes if needed.
- * Only {@link module:engine/view/attributeelement~AttributeElement#isSimilar similar} attribute elements can be merged.
- *
- * In following examples `<p>` is a container and `<b>` is an attribute element:
- *
- * <p>foo[]bar</p> -> <p>foo{}bar</p>
- * <p><b>foo</b>[]<b>bar</b></p> -> <p><b>foo{}bar</b></p>
- * <p><b foo="bar">a</b>[]<b foo="baz">b</b></p> -> <p><b foo="bar">a</b>[]<b foo="baz">b</b></p>
- *
- * It will also take care about empty attributes when merging:
- *
- * <p><b>[]</b></p> -> <p>[]</p>
- * <p><b>foo</b><i>[]</i><b>bar</b></p> -> <p><b>foo{}bar</b></p>
- *
- * **Note:** Difference between {@link module:engine/view/writer~writer.mergeAttributes mergeAttributes} and
- * {@link module:engine/view/writer~writer.mergeContainers mergeContainers} is that `mergeAttributes` merges two
- * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}
- * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.
- *
- * @see module:engine/view/attributeelement~AttributeElement
- * @see module:engine/view/containerelement~ContainerElement
- * @see module:engine/view/writer~writer.mergeContainers
- * @function module:engine/view/writer~writer.mergeAttributes
- * @param {module:engine/view/position~Position} position Merge position.
- * @returns {module:engine/view/position~Position} Position after merge.
- */
- export function mergeAttributes( position ) {
- const positionOffset = position.offset;
- const positionParent = position.parent;
- // When inside text node - nothing to merge.
- if ( positionParent.is( 'text' ) ) {
- return position;
- }
- // When inside empty attribute - remove it.
- if ( positionParent.is( 'attributeElement' ) && positionParent.childCount === 0 ) {
- const parent = positionParent.parent;
- const offset = positionParent.index;
- positionParent.remove();
- return mergeAttributes( new Position( parent, offset ) );
- }
- const nodeBefore = positionParent.getChild( positionOffset - 1 );
- const nodeAfter = positionParent.getChild( positionOffset );
- // Position should be placed between two nodes.
- if ( !nodeBefore || !nodeAfter ) {
- return position;
- }
- // When position is between two text nodes.
- if ( nodeBefore.is( 'text' ) && nodeAfter.is( 'text' ) ) {
- return mergeTextNodes( nodeBefore, nodeAfter );
- }
- // When selection is between two same attribute elements.
- else if ( nodeBefore.is( 'attributeElement' ) && nodeAfter.is( 'attributeElement' ) && nodeBefore.isSimilar( nodeAfter ) ) {
- // Move all children nodes from node placed after selection and remove that node.
- const count = nodeBefore.childCount;
- nodeBefore.appendChildren( nodeAfter.getChildren() );
- nodeAfter.remove();
- // New position is located inside the first node, before new nodes.
- // Call this method recursively to merge again if needed.
- return mergeAttributes( new Position( nodeBefore, count ) );
- }
- return position;
- }
- /**
- * Merges two {@link module:engine/view/containerelement~ContainerElement container elements} that are before and after given position.
- * Precisely, the element after the position is removed and it's contents are moved to element before the position.
- *
- * <p>foo</p>^<p>bar</p> -> <p>foo^bar</p>
- * <div>foo</div>^<p>bar</p> -> <div>foo^bar</div>
- *
- * **Note:** Difference between {@link module:engine/view/writer~writer.mergeAttributes mergeAttributes} and
- * {@link module:engine/view/writer~writer.mergeContainers mergeContainers} is that `mergeAttributes` merges two
- * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}
- * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.
- *
- * @see module:engine/view/attributeelement~AttributeElement
- * @see module:engine/view/containerelement~ContainerElement
- * @see module:engine/view/writer~writer.mergeAttributes
- * @function module:engine/view/writer~writer.mergeContainers
- * @param {module:engine/view/position~Position} position Merge position.
- * @returns {module:engine/view/position~Position} Position after merge.
- */
- export function mergeContainers( position ) {
- const prev = position.nodeBefore;
- const next = position.nodeAfter;
- if ( !prev || !next || !prev.is( 'containerElement' ) || !next.is( 'containerElement' ) ) {
- /**
- * Element before and after given position cannot be merged.
- *
- * @error view-writer-merge-containers-invalid-position
- */
- throw new CKEditorError( 'view-writer-merge-containers-invalid-position: ' +
- 'Element before and after given position cannot be merged.' );
- }
- const lastChild = prev.getChild( prev.childCount - 1 );
- const newPosition = lastChild instanceof Text ? Position.createAt( lastChild, 'end' ) : Position.createAt( prev, 'end' );
- move( Range.createIn( next ), Position.createAt( prev, 'end' ) );
- remove( Range.createOn( next ) );
- return newPosition;
- }
- /**
- * Insert node or nodes at specified position. Takes care about breaking attributes before insertion
- * and merging them afterwards.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert
- * contains instances that are not {@link module:engine/view/text~Text Texts},
- * {@link module:engine/view/attributeelement~AttributeElement AttributeElements},
- * {@link module:engine/view/containerelement~ContainerElement ContainerElements},
- * {@link module:engine/view/emptyelement~EmptyElement EmptyElements} or
- * {@link module:engine/view/uielement~UIElement UIElements}.
- *
- * @function insert
- * @param {module:engine/view/position~Position} position Insertion position.
- * @param {module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement|
- * module:engine/view/containerelement~ContainerElement|module:engine/view/emptyelement~EmptyElement|
- * module:engine/view/uielement~UIElement|Iterable.<module:engine/view/text~Text|
- * module:engine/view/attributeelement~AttributeElement|module:engine/view/containerelement~ContainerElement|
- * module:engine/view/emptyelement~EmptyElement|module:engine/view/uielement~UIElement>} nodes Node or nodes to insert.
- * @returns {module:engine/view/range~Range} Range around inserted nodes.
- */
- export function insert( position, nodes ) {
- nodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];
- // Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.
- validateNodesToInsert( nodes );
- const container = getParentContainer( position );
- if ( !container ) {
- /**
- * Position's parent container cannot be found.
- *
- * @error view-writer-invalid-position-container
- */
- throw new CKEditorError( 'view-writer-invalid-position-container' );
- }
- const insertionPosition = _breakAttributes( position, true );
- const length = container.insertChildren( insertionPosition.offset, nodes );
- let endPosition = insertionPosition.getShiftedBy( length );
- const start = mergeAttributes( insertionPosition );
- // When no nodes were inserted - return collapsed range.
- if ( length === 0 ) {
- return new Range( start, start );
- } else {
- // If start position was merged - move end position.
- if ( !start.isEqual( insertionPosition ) ) {
- endPosition = endPosition.getShiftedBy( -1 );
- }
- const end = mergeAttributes( endPosition );
- return new Range( start, end );
- }
- }
- /**
- * Removes provided range from the container.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when
- * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside
- * same parent container.
- *
- * @function module:engine/view/writer~writer.remove
- * @param {module:engine/view/range~Range} range Range to remove from container. After removing, it will be updated
- * to a collapsed range showing the new position.
- * @returns {module:engine/view/documentfragment~DocumentFragment} Document fragment containing removed nodes.
- */
- export function remove( range ) {
- validateRangeContainer( range );
- // If range is collapsed - nothing to remove.
- if ( range.isCollapsed ) {
- return new DocumentFragment();
- }
- // Break attributes at range start and end.
- const { start: breakStart, end: breakEnd } = _breakAttributesRange( range, true );
- const parentContainer = breakStart.parent;
- const count = breakEnd.offset - breakStart.offset;
- // Remove nodes in range.
- const removed = parentContainer.removeChildren( breakStart.offset, count );
- // Merge after removing.
- const mergePosition = mergeAttributes( breakStart );
- range.start = mergePosition;
- range.end = Position.createFromPosition( mergePosition );
- // Return removed nodes.
- return new DocumentFragment( removed );
- }
- /**
- * Removes matching elements from given range.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when
- * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside
- * same parent container.
- *
- * @function module:engine/view/writer~writer.clear
- * @param {module:engine/view/range~Range} range Range to clear.
- * @param {module:engine/view/element~Element} element Element to remove.
- */
- export function clear( range, element ) {
- validateRangeContainer( range );
- // Create walker on given range.
- // We walk backward because when we remove element during walk it modifies range end position.
- const walker = range.getWalker( {
- direction: 'backward',
- ignoreElementEnd: true
- } );
- // Let's walk.
- for ( const current of walker ) {
- const item = current.item;
- let rangeToRemove;
- // When current item matches to the given element.
- if ( item.is( 'element' ) && element.isSimilar( item ) ) {
- // Create range on this element.
- rangeToRemove = Range.createOn( item );
- // When range starts inside Text or TextProxy element.
- } else if ( !current.nextPosition.isAfter( range.start ) && ( item.is( 'text' ) || item.is( 'textProxy' ) ) ) {
- // We need to check if parent of this text matches to given element.
- const parentElement = item.getAncestors().find( ancestor => {
- return ancestor.is( 'element' ) && element.isSimilar( ancestor );
- } );
- // If it is then create range inside this element.
- if ( parentElement ) {
- rangeToRemove = Range.createIn( parentElement );
- }
- }
- // If we have found element to remove.
- if ( rangeToRemove ) {
- // We need to check if element range stick out of the given range and truncate if it is.
- if ( rangeToRemove.end.isAfter( range.end ) ) {
- rangeToRemove.end = range.end;
- }
- if ( rangeToRemove.start.isBefore( range.start ) ) {
- rangeToRemove.start = range.start;
- }
- // At the end we remove range with found element.
- remove( rangeToRemove );
- }
- }
- }
- /**
- * Moves nodes from provided range to target position.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when
- * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside
- * same parent container.
- *
- * @function module:engine/view/writer~writer.move
- * @param {module:engine/view/range~Range} sourceRange Range containing nodes to move.
- * @param {module:engine/view/position~Position} targetPosition Position to insert.
- * @returns {module:engine/view/range~Range} Range in target container. Inserted nodes are placed between
- * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions.
- */
- export function move( sourceRange, targetPosition ) {
- let nodes;
- if ( targetPosition.isAfter( sourceRange.end ) ) {
- targetPosition = _breakAttributes( targetPosition, true );
- const parent = targetPosition.parent;
- const countBefore = parent.childCount;
- sourceRange = _breakAttributesRange( sourceRange, true );
- nodes = remove( sourceRange );
- targetPosition = targetPosition.getShiftedBy( parent.childCount - countBefore );
- } else {
- nodes = remove( sourceRange );
- }
- return insert( targetPosition, nodes );
- }
- /**
- * Wraps elements within range with provided {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-invalid-range-container`
- * when {@link module:engine/view/range~Range#start}
- * and {@link module:engine/view/range~Range#end} positions are not placed inside same parent container.
- * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not
- * an instance of {module:engine/view/attributeelement~AttributeElement AttributeElement}.
- *
- * @function module:engine/view/writer~writer.wrap
- * @param {module:engine/view/range~Range} range Range to wrap.
- * @param {module:engine/view/attributeelement~AttributeElement} attribute Attribute element to use as wrapper.
- */
- export function wrap( range, attribute ) {
- if ( !( attribute instanceof AttributeElement ) ) {
- throw new CKEditorError( 'view-writer-wrap-invalid-attribute' );
- }
- validateRangeContainer( range );
- // If range is collapsed - nothing to wrap.
- if ( range.isCollapsed ) {
- return range;
- }
- // Range around one element.
- if ( range.end.isEqual( range.start.getShiftedBy( 1 ) ) ) {
- const node = range.start.nodeAfter;
- if ( node instanceof AttributeElement && wrapAttributeElement( attribute, node ) ) {
- return range;
- }
- }
- // Range is inside single attribute and spans on all children.
- if ( rangeSpansOnAllChildren( range ) && wrapAttributeElement( attribute, range.start.parent ) ) {
- const parent = range.start.parent.parent;
- const index = range.start.parent.index;
- return Range.createFromParentsAndOffsets( parent, index, parent, index + 1 );
- }
- // Break attributes at range start and end.
- const { start: breakStart, end: breakEnd } = _breakAttributesRange( range, true );
- const parentContainer = breakStart.parent;
- // Unwrap children located between break points.
- const unwrappedRange = unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );
- // Wrap all children with attribute.
- const newRange = wrapChildren( parentContainer, unwrappedRange.start.offset, unwrappedRange.end.offset, attribute );
- // Merge attributes at the both ends and return a new range.
- const start = mergeAttributes( newRange.start );
- // If start position was merged - move end position back.
- if ( !start.isEqual( newRange.start ) ) {
- newRange.end = newRange.end.getShiftedBy( -1 );
- }
- const end = mergeAttributes( newRange.end );
- return new Range( start, end );
- }
- /**
- * Wraps position with provided attribute. Returns new position after wrapping. This method will also merge newly
- * added attribute with its siblings whenever possible.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not
- * an instance of {module:engine/view/attributeelement~AttributeElement AttributeElement}.
- *
- * @param {module:engine/view/position~Position} position
- * @param {module:engine/view/attributeelement~AttributeElement} attribute
- * @returns {module:engine/view/position~Position} New position after wrapping.
- */
- export function wrapPosition( position, attribute ) {
- if ( !( attribute instanceof AttributeElement ) ) {
- throw new CKEditorError( 'view-writer-wrap-invalid-attribute' );
- }
- // Return same position when trying to wrap with attribute similar to position parent.
- if ( attribute.isSimilar( position.parent ) ) {
- return movePositionToTextNode( Position.createFromPosition( position ) );
- }
- // When position is inside text node - break it and place new position between two text nodes.
- if ( position.parent.is( 'text' ) ) {
- position = breakTextNode( position );
- }
- // Create fake element that will represent position, and will not be merged with other attributes.
- const fakePosition = new AttributeElement();
- fakePosition.priority = Number.POSITIVE_INFINITY;
- fakePosition.isSimilar = () => false;
- // Insert fake element in position location.
- position.parent.insertChildren( position.offset, fakePosition );
- // Range around inserted fake attribute element.
- const wrapRange = new Range( position, position.getShiftedBy( 1 ) );
- // Wrap fake element with attribute (it will also merge if possible).
- wrap( wrapRange, attribute );
- // Remove fake element and place new position there.
- const newPosition = new Position( fakePosition.parent, fakePosition.index );
- fakePosition.remove();
- // If position is placed between text nodes - merge them and return position inside.
- const nodeBefore = newPosition.nodeBefore;
- const nodeAfter = newPosition.nodeAfter;
- if ( nodeBefore instanceof Text && nodeAfter instanceof Text ) {
- return mergeTextNodes( nodeBefore, nodeAfter );
- }
- // If position is next to text node - move position inside.
- return movePositionToTextNode( newPosition );
- }
- /**
- * Unwraps nodes within provided range from attribute element.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when
- * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside
- * same parent container.
- *
- * @param {module:engine/view/range~Range} range
- * @param {module:engine/view/attributeelement~AttributeElement} element
- */
- export function unwrap( range, attribute ) {
- if ( !( attribute instanceof AttributeElement ) ) {
- /**
- * Attribute element need to be instance of attribute element.
- *
- * @error view-writer-unwrap-invalid-attribute
- */
- throw new CKEditorError( 'view-writer-unwrap-invalid-attribute' );
- }
- validateRangeContainer( range );
- // If range is collapsed - nothing to unwrap.
- if ( range.isCollapsed ) {
- return range;
- }
- // Range around one element - check if AttributeElement can be unwrapped partially when it's not similar.
- // For example:
- // <b class="foo bar" title="baz"></b> unwrap with: <b class="foo"></p> result: <b class"bar" title="baz"></b>
- if ( range.end.isEqual( range.start.getShiftedBy( 1 ) ) ) {
- const node = range.start.nodeAfter;
- // Unwrap single attribute element.
- if ( !attribute.isSimilar( node ) && node instanceof AttributeElement && unwrapAttributeElement( attribute, node ) ) {
- return range;
- }
- }
- // Break attributes at range start and end.
- const { start: breakStart, end: breakEnd } = _breakAttributesRange( range, true );
- const parentContainer = breakStart.parent;
- // Unwrap children located between break points.
- const newRange = unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );
- // Merge attributes at the both ends and return a new range.
- const start = mergeAttributes( newRange.start );
- // If start position was merged - move end position back.
- if ( !start.isEqual( newRange.start ) ) {
- newRange.end = newRange.end.getShiftedBy( -1 );
- }
- const end = mergeAttributes( newRange.end );
- return new Range( start, end );
- }
- /**
- * Renames element by creating a copy of renamed element but with changed name and then moving contents of the
- * old element to the new one. Keep in mind that this will invalidate all {@link module:engine/view/position~Position positions} which
- * has renamed element as {@link module:engine/view/position~Position#parent a parent}.
- *
- * New element has to be created because `Element#tagName` property in DOM is readonly.
- *
- * Since this function creates a new element and removes the given one, the new element is returned to keep reference.
- *
- * @param {module:engine/view/containerelement~ContainerElement} viewElement Element to be renamed.
- * @param {String} newName New name for element.
- */
- export function rename( viewElement, newName ) {
- const newElement = new ContainerElement( newName, viewElement.getAttributes() );
- insert( Position.createAfter( viewElement ), newElement );
- move( Range.createIn( viewElement ), Position.createAt( newElement ) );
- remove( Range.createOn( viewElement ) );
- return newElement;
- }
- /**
- * Attribute element need to be instance of attribute element.
- *
- * @error view-writer-wrap-invalid-attribute
- */
- // Returns first parent container of specified {@link module:engine/view/position~Position Position}.
- // Position's parent node is checked as first, then next parents are checked.
- // Note that {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.
- //
- // @param {module:engine/view/position~Position} position Position used as a start point to locate parent container.
- // @returns {module:engine/view/containerelement~ContainerElement|module:engine/view/documentfragment~DocumentFragment|undefined}
- // Parent container element or `undefined` if container is not found.
- function getParentContainer( position ) {
- let parent = position.parent;
- while ( !isContainerOrFragment( parent ) ) {
- if ( !parent ) {
- return undefined;
- }
- parent = parent.parent;
- }
- return parent;
- }
- // Function used by both public breakAttributes (without splitting text nodes) and by other methods (with
- // splitting text nodes).
- //
- // @param {module:engine/view/range~Range} range Range which `start` and `end` positions will be used to break attributes.
- // @param {Boolean} [forceSplitText = false] If set to `true`, will break text nodes even if they are directly in
- // container element. This behavior will result in incorrect view state, but is needed by other view writing methods
- // which then fixes view state. Defaults to `false`.
- // @returns {module:engine/view/range~Range} New range with located at break positions.
- function _breakAttributesRange( range, forceSplitText = false ) {
- const rangeStart = range.start;
- const rangeEnd = range.end;
- validateRangeContainer( range );
- // Break at the collapsed position. Return new collapsed range.
- if ( range.isCollapsed ) {
- const position = _breakAttributes( range.start, forceSplitText );
- return new Range( position, position );
- }
- let breakEnd = _breakAttributes( rangeEnd, forceSplitText );
- const count = breakEnd.parent.childCount;
- const breakStart = _breakAttributes( rangeStart, forceSplitText );
- // Calculate new break end offset.
- breakEnd = breakEnd.getShiftedBy( breakEnd.parent.childCount - count );
- return new Range( breakStart, breakEnd );
- }
- // Function used by public breakAttributes (without splitting text nodes) and by other methods (with
- // splitting text nodes).
- //
- // Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element` when break position
- // is placed inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.
- //
- // Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element` when break position
- // is placed inside {@link module:engine/view/uielement~UIElement UIElement}.
- //
- // @param {module:engine/view/position~Position} position Position where to break attributes.
- // @param {Boolean} [forceSplitText = false] If set to `true`, will break text nodes even if they are directly in
- // container element. This behavior will result in incorrect view state, but is needed by other view writing methods
- // which then fixes view state. Defaults to `false`.
- // @returns {module:engine/view/position~Position} New position after breaking the attributes.
- function _breakAttributes( position, forceSplitText = false ) {
- const positionOffset = position.offset;
- const positionParent = position.parent;
- // If position is placed inside EmptyElement - throw an exception as we cannot break inside.
- if ( position.parent.is( 'emptyElement' ) ) {
- /**
- * Cannot break inside EmptyElement instance.
- *
- * @error view-writer-cannot-break-empty-element
- */
- throw new CKEditorError( 'view-writer-cannot-break-empty-element' );
- }
- // If position is placed inside UIElement - throw an exception as we cannot break inside.
- if ( position.parent.is( 'uiElement' ) ) {
- /**
- * Cannot break inside UIElement instance.
- *
- * @error view-writer-cannot-break-ui-element
- */
- throw new CKEditorError( 'view-writer-cannot-break-ui-element' );
- }
- // There are no attributes to break and text nodes breaking is not forced.
- if ( !forceSplitText && positionParent.is( 'text' ) && isContainerOrFragment( positionParent.parent ) ) {
- return Position.createFromPosition( position );
- }
- // Position's parent is container, so no attributes to break.
- if ( isContainerOrFragment( positionParent ) ) {
- return Position.createFromPosition( position );
- }
- // Break text and start again in new position.
- if ( positionParent.is( 'text' ) ) {
- return _breakAttributes( breakTextNode( position ), forceSplitText );
- }
- const length = positionParent.childCount;
- // <p>foo<b><u>bar{}</u></b></p>
- // <p>foo<b><u>bar</u>[]</b></p>
- // <p>foo<b><u>bar</u></b>[]</p>
- if ( positionOffset == length ) {
- const newPosition = new Position( positionParent.parent, positionParent.index + 1 );
- return _breakAttributes( newPosition, forceSplitText );
- } else
- // <p>foo<b><u>{}bar</u></b></p>
- // <p>foo<b>[]<u>bar</u></b></p>
- // <p>foo{}<b><u>bar</u></b></p>
- if ( positionOffset === 0 ) {
- const newPosition = new Position( positionParent.parent, positionParent.index );
- return _breakAttributes( newPosition, forceSplitText );
- }
- // <p>foo<b><u>b{}ar</u></b></p>
- // <p>foo<b><u>b[]ar</u></b></p>
- // <p>foo<b><u>b</u>[]<u>ar</u></b></p>
- // <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>
- else {
- const offsetAfter = positionParent.index + 1;
- // Break element.
- const clonedNode = positionParent.clone();
- // Insert cloned node to position's parent node.
- positionParent.parent.insertChildren( offsetAfter, clonedNode );
- // Get nodes to move.
- const count = positionParent.childCount - positionOffset;
- const nodesToMove = positionParent.removeChildren( positionOffset, count );
- // Move nodes to cloned node.
- clonedNode.appendChildren( nodesToMove );
- // Create new position to work on.
- const newPosition = new Position( positionParent.parent, offsetAfter );
- return _breakAttributes( newPosition, forceSplitText );
- }
- }
- // Unwraps children from provided `attribute`. Only children contained in `parent` element between
- // `startOffset` and `endOffset` will be unwrapped.
- //
- // @param {module:engine/view/element~Element} parent
- // @param {Number} startOffset
- // @param {Number} endOffset
- // @param {module:engine/view/element~Element} attribute
- function unwrapChildren( parent, startOffset, endOffset, attribute ) {
- let i = startOffset;
- const unwrapPositions = [];
- // Iterate over each element between provided offsets inside parent.
- while ( i < endOffset ) {
- const child = parent.getChild( i );
- // If attributes are the similar, then unwrap.
- if ( child.isSimilar( attribute ) ) {
- const unwrapped = child.getChildren();
- const count = child.childCount;
- // Replace wrapper element with its children
- child.remove();
- parent.insertChildren( i, unwrapped );
- // Save start and end position of moved items.
- unwrapPositions.push(
- new Position( parent, i ),
- new Position( parent, i + count )
- );
- // Skip elements that were unwrapped. Assuming that there won't be another element to unwrap in child
- // elements.
- i += count;
- endOffset += count - 1;
- } else {
- // If other nested attribute is found start unwrapping there.
- if ( child.is( 'attributeElement' ) ) {
- unwrapChildren( child, 0, child.childCount, attribute );
- }
- i++;
- }
- }
- // Merge at each unwrap.
- let offsetChange = 0;
- for ( let position of unwrapPositions ) {
- position = position.getShiftedBy( -offsetChange );
- // Do not merge with elements outside selected children.
- if ( position.offset == startOffset || position.offset == endOffset ) {
- continue;
- }
- const newPosition = mergeAttributes( position );
- // If nodes were merged - other merge offsets will change.
- if ( !newPosition.isEqual( position ) ) {
- offsetChange++;
- endOffset--;
- }
- }
- return Range.createFromParentsAndOffsets( parent, startOffset, parent, endOffset );
- }
- // Wraps children with provided `attribute`. Only children contained in `parent` element between
- // `startOffset` and `endOffset` will be wrapped.
- //
- // @param {module:engine/view/element~Element} parent
- // @param {Number} startOffset
- // @param {Number} endOffset
- // @param {module:engine/view/element~Element} attribute
- function wrapChildren( parent, startOffset, endOffset, attribute ) {
- let i = startOffset;
- const wrapPositions = [];
- while ( i < endOffset ) {
- const child = parent.getChild( i );
- const isText = child.is( 'text' );
- const isAttribute = child.is( 'attributeElement' );
- const isEmpty = child.is( 'emptyElement' );
- const isUI = child.is( 'uiElement' );
- // Wrap text, empty elements, ui elements or attributes with higher or equal priority.
- if ( isText || isEmpty || isUI || ( isAttribute && shouldABeOutsideB( attribute, child ) ) ) {
- // Clone attribute.
- const newAttribute = attribute.clone();
- // Wrap current node with new attribute;
- child.remove();
- newAttribute.appendChildren( child );
- parent.insertChildren( i, newAttribute );
- wrapPositions.push( new Position( parent, i ) );
- }
- // If other nested attribute is found start wrapping there.
- else if ( isAttribute ) {
- wrapChildren( child, 0, child.childCount, attribute );
- }
- i++;
- }
- // Merge at each wrap.
- let offsetChange = 0;
- for ( let position of wrapPositions ) {
- position = position.getShiftedBy( -offsetChange );
- // Do not merge with elements outside selected children.
- if ( position.offset == startOffset ) {
- continue;
- }
- const newPosition = mergeAttributes( position );
- // If nodes were merged - other merge offsets will change.
- if ( !newPosition.isEqual( position ) ) {
- offsetChange++;
- endOffset--;
- }
- }
- return Range.createFromParentsAndOffsets( parent, startOffset, parent, endOffset );
- }
- // Checks if first {@link module:engine/view/attributeelement~AttributeElement AttributeElement} provided to the function
- // can be wrapped otuside second element. It is done by comparing elements'
- // {@link module:engine/view/attributeelement~AttributeElement#priority priorities}, if both have same priority
- // {@link module:engine/view/element~Element#getIdentity identities} are compared.
- //
- // @param {module:engine/view/attributeelement~AttributeElement} a
- // @param {module:engine/view/attributeelement~AttributeElement} b
- // @returns {Boolean}
- function shouldABeOutsideB( a, b ) {
- if ( a.priority < b.priority ) {
- return true;
- } else if ( a.priority > b.priority ) {
- return false;
- }
- // When priorities are equal and names are different - use identities.
- return a.getIdentity() < b.getIdentity();
- }
- // Returns new position that is moved to near text node. Returns same position if there is no text node before of after
- // specified position.
- //
- // <p>foo[]</p> -> <p>foo{}</p>
- // <p>[]foo</p> -> <p>{}foo</p>
- //
- // @param {module:engine/view/position~Position} position
- // @returns {module:engine/view/position~Position} Position located inside text node or same position if there is no text nodes
- // before or after position location.
- function movePositionToTextNode( position ) {
- const nodeBefore = position.nodeBefore;
- if ( nodeBefore && nodeBefore.is( 'text' ) ) {
- return new Position( nodeBefore, nodeBefore.data.length );
- }
- const nodeAfter = position.nodeAfter;
- if ( nodeAfter && nodeAfter.is( 'text' ) ) {
- return new Position( nodeAfter, 0 );
- }
- return position;
- }
- // Breaks text node into two text nodes when possible.
- //
- // <p>foo{}bar</p> -> <p>foo[]bar</p>
- // <p>{}foobar</p> -> <p>[]foobar</p>
- // <p>foobar{}</p> -> <p>foobar[]</p>
- //
- // @param {module:engine/view/position~Position} position Position that need to be placed inside text node.
- // @returns {module:engine/view/position~Position} New position after breaking text node.
- function breakTextNode( position ) {
- if ( position.offset == position.parent.data.length ) {
- return new Position( position.parent.parent, position.parent.index + 1 );
- }
- if ( position.offset === 0 ) {
- return new Position( position.parent.parent, position.parent.index );
- }
- // Get part of the text that need to be moved.
- const textToMove = position.parent.data.slice( position.offset );
- // Leave rest of the text in position's parent.
- position.parent.data = position.parent.data.slice( 0, position.offset );
- // Insert new text node after position's parent text node.
- position.parent.parent.insertChildren( position.parent.index + 1, new Text( textToMove ) );
- // Return new position between two newly created text nodes.
- return new Position( position.parent.parent, position.parent.index + 1 );
- }
- // Merges two text nodes into first node. Removes second node and returns merge position.
- //
- // @param {module:engine/view/text~Text} t1 First text node to merge. Data from second text node will be moved at the end of
- // this text node.
- // @param {module:engine/view/text~Text} t2 Second text node to merge. This node will be removed after merging.
- // @returns {module:engine/view/position~Position} Position after merging text nodes.
- function mergeTextNodes( t1, t2 ) {
- // Merge text data into first text node and remove second one.
- const nodeBeforeLength = t1.data.length;
- t1.data += t2.data;
- t2.remove();
- return new Position( t1, nodeBeforeLength );
- }
- // Wraps one {@link module:engine/view/attributeelement~AttributeElement AttributeElement} into another by merging them if possible.
- // When merging is possible - all attributes, styles and classes are moved from wrapper element to element being
- // wrapped.
- //
- // @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.
- // @param {module:engine/view/attributeelement~AttributeElement} toWrap AttributeElement to wrap using wrapper element.
- // @returns {Boolean} Returns `true` if elements are merged.
- function wrapAttributeElement( wrapper, toWrap ) {
- // Can't merge if name or priority differs.
- if ( wrapper.name !== toWrap.name || wrapper.priority !== toWrap.priority ) {
- return false;
- }
- // Check if attributes can be merged.
- for ( const key of wrapper.getAttributeKeys() ) {
- // Classes and styles should be checked separately.
- if ( key === 'class' || key === 'style' ) {
- continue;
- }
- // If some attributes are different we cannot wrap.
- if ( toWrap.hasAttribute( key ) && toWrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {
- return false;
- }
- }
- // Check if styles can be merged.
- for ( const key of wrapper.getStyleNames() ) {
- if ( toWrap.hasStyle( key ) && toWrap.getStyle( key ) !== wrapper.getStyle( key ) ) {
- return false;
- }
- }
- // Move all attributes/classes/styles from wrapper to wrapped AttributeElement.
- for ( const key of wrapper.getAttributeKeys() ) {
- // Classes and styles should be checked separately.
- if ( key === 'class' || key === 'style' ) {
- continue;
- }
- // Move only these attributes that are not present - other are similar.
- if ( !toWrap.hasAttribute( key ) ) {
- toWrap.setAttribute( key, wrapper.getAttribute( key ) );
- }
- }
- for ( const key of wrapper.getStyleNames() ) {
- if ( !toWrap.hasStyle( key ) ) {
- toWrap.setStyle( key, wrapper.getStyle( key ) );
- }
- }
- for ( const key of wrapper.getClassNames() ) {
- if ( !toWrap.hasClass( key ) ) {
- toWrap.addClass( key );
- }
- }
- return true;
- }
- // Unwraps {@link module:engine/view/attributeelement~AttributeElement AttributeElement} from another by removing corresponding attributes,
- // classes and styles. All attributes, classes and styles from wrapper should be present inside element being unwrapped.
- //
- // @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.
- // @param {module:engine/view/attributeelement~AttributeElement} toUnwrap AttributeElement to unwrap using wrapper element.
- // @returns {Boolean} Returns `true` if elements are unwrapped.
- function unwrapAttributeElement( wrapper, toUnwrap ) {
- // Can't unwrap if name or priority differs.
- if ( wrapper.name !== toUnwrap.name || wrapper.priority !== toUnwrap.priority ) {
- return false;
- }
- // Check if AttributeElement has all wrapper attributes.
- for ( const key of wrapper.getAttributeKeys() ) {
- // Classes and styles should be checked separately.
- if ( key === 'class' || key === 'style' ) {
- continue;
- }
- // If some attributes are missing or different we cannot unwrap.
- if ( !toUnwrap.hasAttribute( key ) || toUnwrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {
- return false;
- }
- }
- // Check if AttributeElement has all wrapper classes.
- if ( !toUnwrap.hasClass( ...wrapper.getClassNames() ) ) {
- return false;
- }
- // Check if AttributeElement has all wrapper styles.
- for ( const key of wrapper.getStyleNames() ) {
- // If some styles are missing or different we cannot unwrap.
- if ( !toUnwrap.hasStyle( key ) || toUnwrap.getStyle( key ) !== wrapper.getStyle( key ) ) {
- return false;
- }
- }
- // Remove all wrapper's attributes from unwrapped element.
- for ( const key of wrapper.getAttributeKeys() ) {
- // Classes and styles should be checked separately.
- if ( key === 'class' || key === 'style' ) {
- continue;
- }
- toUnwrap.removeAttribute( key );
- }
- // Remove all wrapper's classes from unwrapped element.
- toUnwrap.removeClass( ...wrapper.getClassNames() );
- // Remove all wrapper's styles from unwrapped element.
- toUnwrap.removeStyle( ...wrapper.getStyleNames() );
- return true;
- }
- // Returns `true` if range is located in same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}
- // (`start` and `end` positions are located inside same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}),
- // starts on 0 offset and ends after last child node.
- //
- // @param {module:engine/view/range~Range} Range
- // @returns {Boolean}
- function rangeSpansOnAllChildren( range ) {
- return range.start.parent == range.end.parent && range.start.parent.is( 'attributeElement' ) &&
- range.start.offset === 0 && range.end.offset === range.start.parent.childCount;
- }
- // Checks if provided nodes are valid to insert. Checks if each node is an instance of
- // {@link module:engine/view/text~Text Text} or {@link module:engine/view/attributeelement~AttributeElement AttributeElement},
- // {@link module:engine/view/containerelement~ContainerElement ContainerElement},
- // {@link module:engine/view/emptyelement~EmptyElement EmptyElement} or
- // {@link module:engine/view/uielement~UIElement UIElement}.
- //
- // Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert
- // contains instances that are not {@link module:engine/view/text~Text Texts},
- // {@link module:engine/view/emptyelement~EmptyElement EmptyElements},
- // {@link module:engine/view/uielement~UIElement UIElements},
- // {@link module:engine/view/attributeelement~AttributeElement AttributeElements} or
- // {@link module:engine/view/containerelement~ContainerElement ContainerElements}.
- //
- // @param Iterable.<module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement
- // |module:engine/view/containerelement~ContainerElement> nodes
- function validateNodesToInsert( nodes ) {
- for ( const node of nodes ) {
- if ( !validNodesToInsert.some( ( validNode => node instanceof validNode ) ) ) { // eslint-disable-line no-use-before-define
- /**
- * Inserted nodes should be valid to insert. of {@link module:engine/view/attributeelement~AttributeElement AttributeElement},
- * {@link module:engine/view/containerelement~ContainerElement ContainerElement},
- * {@link module:engine/view/emptyelement~EmptyElement EmptyElement},
- * {@link module:engine/view/uielement~UIElement UIElement}, {@link module:engine/view/text~Text Text}.
- *
- * @error view-writer-insert-invalid-node
- */
- throw new CKEditorError( 'view-writer-insert-invalid-node' );
- }
- if ( !node.is( 'text' ) ) {
- validateNodesToInsert( node.getChildren() );
- }
- }
- }
- const validNodesToInsert = [ Text, AttributeElement, ContainerElement, EmptyElement, UIElement ];
- // Checks if node is ContainerElement or DocumentFragment, because in most cases they should be treated the same way.
- //
- // @param {module:engine/view/node~Node} node
- // @returns {Boolean} Returns `true` if node is instance of ContainerElement or DocumentFragment.
- function isContainerOrFragment( node ) {
- return node && ( node.is( 'containerElement' ) || node.is( 'documentFragment' ) );
- }
- // Checks if {@link module:engine/view/range~Range#start range start} and {@link module:engine/view/range~Range#end range end} are placed
- // inside same {@link module:engine/view/containerelement~ContainerElement container element}.
- // Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when validation fails.
- //
- // @param {module:engine/view/range~Range} range
- function validateRangeContainer( range ) {
- const startContainer = getParentContainer( range.start );
- const endContainer = getParentContainer( range.end );
- if ( !startContainer || !endContainer || startContainer !== endContainer ) {
- /**
- * Range container is invalid. This can happen if {@link module:engine/view/range~Range#start range start} and
- * {@link module:engine/view/range~Range#end range end} positions are not placed inside same container or
- * parent container for these positions cannot be found.
- *
- * @error view-writer-invalid-range-container
- */
- throw new CKEditorError( 'view-writer-invalid-range-container' );
- }
- }
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