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* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module list/utils\n */\n\nimport { TreeWalker, getFillerOffset } from 'ckeditor5/src/engine';\nimport { ButtonView } from 'ckeditor5/src/ui';\n\n/**\n * Creates a list item {@link module:engine/view/containerelement~ContainerElement}.\n *\n * @param {module:engine/view/downcastwriter~DowncastWriter} writer The writer instance.\n * @returns {module:engine/view/containerelement~ContainerElement}\n */\nexport function createViewListItemElement( writer ) {\n\tconst viewItem = writer.createContainerElement( 'li' );\n\n\tviewItem.getFillerOffset = getListItemFillerOffset;\n\n\treturn viewItem;\n}\n\n/**\n * Helper function that creates a `<ul><li></li></ul>` or (`<ol>`) structure out of the given `modelItem` model `listItem` element.\n * Then, it binds the created view list item (`<li>`) with the model `listItem` element.\n * The function then returns the created view list item (`<li>`).\n *\n * @param {module:engine/model/item~Item} modelItem Model list item.\n * @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi Conversion interface.\n * @returns {module:engine/view/containerelement~ContainerElement} View list element.\n */\nexport function generateLiInUl( modelItem, conversionApi ) {\n\tconst mapper = conversionApi.mapper;\n\tconst viewWriter = conversionApi.writer;\n\tconst listType = modelItem.getAttribute( 'listType' ) == 'numbered' ? 'ol' : 'ul';\n\tconst viewItem = createViewListItemElement( viewWriter );\n\n\tconst viewList = viewWriter.createContainerElement( listType, null );\n\n\tviewWriter.insert( viewWriter.createPositionAt( viewList, 0 ), viewItem );\n\n\tmapper.bindElements( modelItem, viewItem );\n\n\treturn viewItem;\n}\n\n/**\n * Helper function that inserts a view list at a correct place and merges it with its siblings.\n * It takes a model list item element (`modelItem`) and a corresponding view list item element (`injectedItem`). The view list item\n * should be in a view list element (`<ul>` or `<ol>`) and should be its only child.\n * See comments below to better understand the algorithm.\n *\n * @param {module:engine/view/item~Item} modelItem Model list item.\n * @param {module:engine/view/containerelement~ContainerElement} injectedItem\n * @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi Conversion interface.\n * @param {module:engine/model/model~Model} model The model instance.\n */\nexport function injectViewList( modelItem, injectedItem, conversionApi, model ) {\n\tconst injectedList = injectedItem.parent;\n\tconst mapper = conversionApi.mapper;\n\tconst viewWriter = conversionApi.writer;\n\n\t// The position where the view list will be inserted.\n\tlet insertPosition = mapper.toViewPosition( model.createPositionBefore( modelItem ) );\n\n\t// 1. Find the previous list item that has the same or smaller indent. Basically we are looking for the first model item\n\t// that is a \"parent\" or \"sibling\" of the injected model item.\n\t// If there is no such list item, it means that the injected list item is the first item in \"its list\".\n\tconst refItem = getSiblingListItem( modelItem.previousSibling, {\n\t\tsameIndent: true,\n\t\tsmallerIndent: true,\n\t\tlistIndent: modelItem.getAttribute( 'listIndent' )\n\t} );\n\tconst prevItem = modelItem.previousSibling;\n\n\tif ( refItem && refItem.getAttribute( 'listIndent' ) == modelItem.getAttribute( 'listIndent' ) ) {\n\t\t// There is a list item with the same indent - we found the same-level sibling.\n\t\t// Break the list after it. The inserted view item will be added in the broken space.\n\t\tconst viewItem = mapper.toViewElement( refItem );\n\t\tinsertPosition = viewWriter.breakContainer( viewWriter.createPositionAfter( viewItem ) );\n\t} else {\n\t\t// There is no list item with the same indent. Check the previous model item.\n\t\tif ( prevItem && prevItem.name == 'listItem' ) {\n\t\t\t// If it is a list item, it has to have a lower indent.\n\t\t\t// It means that the inserted item should be added to it as its nested item.\n\t\t\tinsertPosition = mapper.toViewPosition( model.createPositionAt( prevItem, 'end' ) );\n\n\t\t\t// There could be some not mapped elements (eg. span in to-do list) but we need to insert\n\t\t\t// a nested list directly inside the li element.\n\t\t\tconst mappedViewAncestor = mapper.findMappedViewAncestor( insertPosition );\n\t\t\tconst nestedList = findNestedList( mappedViewAncestor );\n\n\t\t\t// If there already is some nested list, then use it's position.\n\t\t\tif ( nestedList ) {\n\t\t\t\tinsertPosition = viewWriter.createPositionBefore( nestedList );\n\t\t\t} else {\n\t\t\t\t// Else just put new list on the end of list item content.\n\t\t\t\tinsertPosition = viewWriter.createPositionAt( mappedViewAncestor, 'end' );\n\t\t\t}\n\t\t} else {\n\t\t\t// The previous item is not a list item (or does not exist at all).\n\t\t\t// Just map the position and insert the view item at the mapped position.\n\t\t\tinsertPosition = mapper.toViewPosition( model.createPositionBefore( modelItem ) );\n\t\t}\n\t}\n\n\tinsertPosition = positionAfterUiElements( insertPosition );\n\n\t// Insert the view item.\n\tviewWriter.insert( insertPosition, injectedList );\n\n\t// 2. Handle possible children of the injected model item.\n\tif ( prevItem && prevItem.name == 'listItem' ) {\n\t\tconst prevView = mapper.toViewElement( prevItem );\n\n\t\tconst walkerBoundaries = viewWriter.createRange( viewWriter.createPositionAt( prevView, 0 ), insertPosition );\n\t\tconst walker = walkerBoundaries.getWalker( { ignoreElementEnd: true } );\n\n\t\tfor ( const value of walker ) {\n\t\t\tif ( value.item.is( 'element', 'li' ) ) {\n\t\t\t\tconst breakPosition = viewWriter.breakContainer( viewWriter.createPositionBefore( value.item ) );\n\t\t\t\tconst viewList = value.item.parent;\n\n\t\t\t\tconst targetPosition = viewWriter.createPositionAt( injectedItem, 'end' );\n\t\t\t\tmergeViewLists( viewWriter, targetPosition.nodeBefore, targetPosition.nodeAfter );\n\t\t\t\tviewWriter.move( viewWriter.createRangeOn( viewList ), targetPosition );\n\n\t\t\t\twalker.position = breakPosition;\n\t\t\t}\n\t\t}\n\t} else {\n\t\tconst nextViewList = injectedList.nextSibling;\n\n\t\tif ( nextViewList && ( nextViewList.is( 'element', 'ul' ) || nextViewList.is( 'element', 'ol' ) ) ) {\n\t\t\tlet lastSubChild = null;\n\n\t\t\tfor ( const child of nextViewList.getChildren() ) {\n\t\t\t\tconst modelChild = mapper.toModelElement( child );\n\n\t\t\t\tif ( modelChild && modelChild.getAttribute( 'listIndent' ) > modelItem.getAttribute( 'listIndent' ) ) {\n\t\t\t\t\tlastSubChild = child;\n\t\t\t\t} else {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( lastSubChild ) {\n\t\t\t\tviewWriter.breakContainer( viewWriter.createPositionAfter( lastSubChild ) );\n\t\t\t\tviewWriter.move( viewWriter.createRangeOn( lastSubChild.parent ), viewWriter.createPositionAt( injectedItem, 'end' ) );\n\t\t\t}\n\t\t}\n\t}\n\n\t// Merge the inserted view list with its possible neighbor lists.\n\tmergeViewLists( viewWriter, injectedList, injectedList.nextSibling );\n\tmergeViewLists( viewWriter, injectedList.previousSibling, injectedList );\n}\n\n/**\n * Helper function that takes two parameters that are expected to be view list elements, and merges them.\n * The merge happens only if both parameters are list elements of the same type (the same element name and the same class attributes).\n *\n * @param {module:engine/view/downcastwriter~DowncastWriter} viewWriter The writer instance.\n * @param {module:engine/view/item~Item} firstList The first element to compare.\n * @param {module:engine/view/item~Item} secondList The second element to compare.\n * @returns {module:engine/view/position~Position|null} The position after merge or `null` when there was no merge.\n */\nexport function mergeViewLists( viewWriter, firstList, secondList ) {\n\t// Check if two lists are going to be merged.\n\tif ( !firstList || !secondList || ( firstList.name != 'ul' && firstList.name != 'ol' ) ) {\n\t\treturn null;\n\t}\n\n\t// Both parameters are list elements, so compare types now.\n\tif ( firstList.name != secondList.name || firstList.getAttribute( 'class' ) !== secondList.getAttribute( 'class' ) ) {\n\t\treturn null;\n\t}\n\n\treturn viewWriter.mergeContainers( viewWriter.createPositionAfter( firstList ) );\n}\n\n/**\n * Helper function that for a given `view.Position`, returns a `view.Position` that is after all `view.UIElement`s that\n * are after the given position.\n *\n * For example:\n * `<container:p>foo^<ui:span></ui:span><ui:span></ui:span>bar</container:p>`\n * For position ^, the position before \"bar\" will be returned.\n *\n * @param {module:engine/view/position~Position} viewPosition\n * @returns {module:engine/view/position~Position}\n */\nexport function positionAfterUiElements( viewPosition ) {\n\treturn viewPosition.getLastMatchingPosition( value => value.item.is( 'uiElement' ) );\n}\n\n/**\n * Helper function that searches for a previous list item sibling of a given model item that meets the given criteria\n * passed by the options object.\n *\n * @param {module:engine/model/item~Item} modelItem\n * @param {Object} options Search criteria.\n * @param {Boolean} [options.sameIndent=false] Whether the sought sibling should have the same indentation.\n * @param {Boolean} [options.smallerIndent=false] Whether the sought sibling should have a smaller indentation.\n * @param {Number} [options.listIndent] The reference indentation.\n * @param {'forward'|'backward'} [options.direction='backward'] Walking direction.\n * @returns {module:engine/model/item~Item|null}\n */\nexport function getSiblingListItem( modelItem, options ) {\n\tconst sameIndent = !!options.sameIndent;\n\tconst smallerIndent = !!options.smallerIndent;\n\tconst indent = options.listIndent;\n\n\tlet item = modelItem;\n\n\twhile ( item && item.name == 'listItem' ) {\n\t\tconst itemIndent = item.getAttribute( 'listIndent' );\n\n\t\tif ( ( sameIndent && indent == itemIndent ) || ( smallerIndent && indent > itemIndent ) ) {\n\t\t\treturn item;\n\t\t}\n\n\t\tif ( options.direction === 'forward' ) {\n\t\t\titem = item.nextSibling;\n\t\t} else {\n\t\t\titem = item.previousSibling;\n\t\t}\n\t}\n\n\treturn null;\n}\n\n/**\n * Helper method for creating a UI button and linking it with an appropriate command.\n *\n * @private\n * @param {module:core/editor/editor~Editor} editor The editor instance to which the UI component will be added.\n * @param {String} commandName The name of the command.\n * @param {String} label The button label.\n * @param {String} icon The source of the icon.\n */\nexport function createUIComponent( editor, commandName, label, icon ) {\n\teditor.ui.componentFactory.add( commandName, locale => {\n\t\tconst command = editor.commands.get( commandName );\n\t\tconst buttonView = new ButtonView( locale );\n\n\t\tbuttonView.set( {\n\t\t\tlabel,\n\t\t\ticon,\n\t\t\ttooltip: true,\n\t\t\tisToggleable: true\n\t\t} );\n\n\t\t// Bind button model to command.\n\t\tbuttonView.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );\n\n\t\t// Execute command.\n\t\tbuttonView.on( 'execute', () => {\n\t\t\teditor.execute( commandName );\n\t\t\teditor.editing.view.focus();\n\t\t} );\n\n\t\treturn buttonView;\n\t} );\n}\n\n/**\n * Returns a first list view element that is direct child of the given view element.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @return {module:engine/view/element~Element|null}\n */\nexport function findNestedList( viewElement ) {\n\tfor ( const node of viewElement.getChildren() ) {\n\t\tif ( node.name == 'ul' || node.name == 'ol' ) {\n\t\t\treturn node;\n\t\t}\n\t}\n\n\treturn null;\n}\n\n/**\n * Returns an array with all `listItem` elements that represents the same list.\n *\n * It means that values for `listIndent`, `listType`, and `listStyle` for all items are equal.\n *\n * @param {module:engine/model/position~Position} position Starting position.\n * @param {'forward'|'backward'} direction Walking direction.\n * @returns {Array.<module:engine/model/element~Element>}\n */\nexport function getSiblingNodes( position, direction ) {\n\tconst items = [];\n\tconst listItem = position.parent;\n\tconst walkerOptions = {\n\t\tignoreElementEnd: true,\n\t\tstartPosition: position,\n\t\tshallow: true,\n\t\tdirection\n\t};\n\tconst limitIndent = listItem.getAttribute( 'listIndent' );\n\tconst nodes = [ ...new TreeWalker( walkerOptions ) ]\n\t\t.filter( value => value.item.is( 'element' ) )\n\t\t.map( value => value.item );\n\n\tfor ( const element of nodes ) {\n\t\t// If found something else than `listItem`, we're out of the list scope.\n\t\tif ( !element.is( 'element', 'listItem' ) ) {\n\t\t\tbreak;\n\t\t}\n\n\t\t// If current parsed item has lower indent that element that the element that was a starting point,\n\t\t// it means we left a nested list. Abort searching items.\n\t\t//\n\t\t// ■ List item 1.       [listIndent=0]\n\t\t//     ○ List item 2.[] [listIndent=1], limitIndent = 1,\n\t\t//     ○ List item 3.   [listIndent=1]\n\t\t// ■ List item 4.       [listIndent=0]\n\t\t//\n\t\t// Abort searching when leave nested list.\n\t\tif ( element.getAttribute( 'listIndent' ) < limitIndent ) {\n\t\t\tbreak;\n\t\t}\n\n\t\t// ■ List item 1.[]     [listIndent=0] limitIndent = 0,\n\t\t//     ○ List item 2.   [listIndent=1]\n\t\t//     ○ List item 3.   [listIndent=1]\n\t\t// ■ List item 4.       [listIndent=0]\n\t\t//\n\t\t// Ignore nested lists.\n\t\tif ( element.getAttribute( 'listIndent' ) > limitIndent ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\t// ■ List item 1.[]  [listType=bulleted]\n\t\t// 1. List item 2.   [listType=numbered]\n\t\t// 2.List item 3.    [listType=numbered]\n\t\t//\n\t\t// Abort searching when found a different kind of a list.\n\t\tif ( element.getAttribute( 'listType' ) !== listItem.getAttribute( 'listType' ) ) {\n\t\t\tbreak;\n\t\t}\n\n\t\t// ■ List item 1.[]  [listType=bulleted]\n\t\t// ■ List item 2.    [listType=bulleted]\n\t\t// ○ List item 3.    [listType=bulleted]\n\t\t// ○ List item 4.    [listType=bulleted]\n\t\t//\n\t\t// Abort searching when found a different list style.\n\t\tif ( element.getAttribute( 'listStyle' ) !== listItem.getAttribute( 'listStyle' ) ) {\n\t\t\tbreak;\n\t\t}\n\n\t\tif ( direction === 'backward' ) {\n\t\t\titems.unshift( element );\n\t\t} else {\n\t\t\titems.push( element );\n\t\t}\n\t}\n\n\treturn items;\n}\n\n// Implementation of getFillerOffset for view list item element.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getListItemFillerOffset() {\n\tconst hasOnlyLists = !this.isEmpty && ( this.getChild( 0 ).name == 'ul' || this.getChild( 0 ).name == 'ol' );\n\n\tif ( this.isEmpty || hasOnlyLists ) {\n\t\treturn 0;\n\t}\n\n\treturn getFillerOffset.call( this );\n}\n"],"sourceRoot":""}