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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 enter/shiftentercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getCopyOnEnterAttributes } from './utils';\n\n/**\n * ShiftEnter command. It is used by the {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature} to handle\n * the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke.\n *\n * @extends module:core/command~Command\n */\nexport default class ShiftEnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tsoftBreakAction( model, writer, doc.selection );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tthis.isEnabled = isEnabled( model.schema, doc.selection );\n\t}\n}\n\n// Checks whether the ShiftEnter command should be enabled in the specified selection.\n//\n// @param {module:engine/model/schema~Schema} schema\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\nfunction isEnabled( schema, selection ) {\n\t// At this moment it is okay to support single range selections only.\n\t// But in the future we may need to change that.\n\tif ( selection.rangeCount > 1 ) {\n\t\treturn false;\n\t}\n\n\tconst anchorPos = selection.anchor;\n\n\t// Check whether the break element can be inserted in the current selection anchor.\n\tif ( !anchorPos || !schema.checkChild( anchorPos, 'softBreak' ) ) {\n\t\treturn false;\n\t}\n\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Do not modify the content if selection is cross-limit elements.\n\tif ( ( isInsideLimitElement( startElement, schema ) || isInsideLimitElement( endElement, schema ) ) && startElement !== endElement ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n\n// Creates a break in the way that the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\nfunction softBreakAction( model, writer, selection ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\tif ( isSelectionEmpty ) {\n\t\tconst attributesToCopy = getCopyOnEnterAttributes( model.schema, selection.getAttributes() );\n\t\tinsertBreak( model, writer, range.end );\n\n\t\twriter.removeSelectionAttribute( selection.getAttributeKeys() );\n\t\twriter.setSelectionAttribute( attributesToCopy );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\t// Selection within one element:\n\t\t//\n\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x<br>^x</h>\n\t\tif ( isContainedWithinOneElement ) {\n\t\t\tinsertBreak( model, writer, selection.focus );\n\t\t}\n\t\t// Selection over multiple elements.\n\t\t//\n\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t//\n\t\t// We chose not to insert a line break in this case because:\n\t\t//\n\t\t// * it's not a very common scenario,\n\t\t// * it actually surprised me when I saw the \"expected behavior\" in real life.\n\t\t//\n\t\t// It's ok if the user will need to be more specific where they want the <br> to be inserted.\n\t\telse {\n\t\t\t// Move the selection to the 2nd element (last step of the example above).\n\t\t\tif ( leaveUnmerged ) {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction insertBreak( model, writer, position ) {\n\tconst breakLineElement = writer.createElement( 'softBreak' );\n\n\tmodel.insertContent( breakLineElement, position );\n\twriter.setSelection( breakLineElement, 'after' );\n}\n\n// Checks whether the specified `element` is a child of the limit element.\n//\n// Checking whether the `<p>` element is inside a limit element:\n//   - <$root><p>Text.</p></$root> => false\n//   - <$root><limitElement><p>Text</p></limitElement></$root> => true\n//\n// @param {module:engine/model/element~Element} element\n// @param {module:engine/schema~Schema} schema\n// @returns {Boolean}\nfunction isInsideLimitElement( element, schema ) {\n\t// `$root` is a limit element but in this case is an invalid element.\n\tif ( element.is( 'rootElement' ) ) {\n\t\treturn false;\n\t}\n\n\treturn schema.isLimit( element ) || isInsideLimitElement( element.parent, schema );\n}\n","/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/shiftenter\n */\n\nimport ShiftEnterCommand from './shiftentercommand';\nimport EnterObserver from './enterobserver';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * This plugin handles the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke (soft line break) in the editor.\n *\n * See also the {@link module:enter/enter~Enter} plugin.\n *\n * For more information about this feature see the {@glink api/enter package page}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ShiftEnter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ShiftEnter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst conversion = editor.conversion;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t// Configure the schema.\n\t\tschema.register( 'softBreak', {\n\t\t\tallowWhere: '$text',\n\t\t\tisInline: true\n\t\t} );\n\n\t\t// Configure converters.\n\t\tconversion.for( 'upcast' )\n\t\t\t.elementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: 'br'\n\t\t\t} );\n\n\t\tconversion.for( 'downcast' )\n\t\t\t.elementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: ( modelElement, { writer } ) => writer.createEmptyElement( 'br' )\n\t\t\t} );\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'shiftEnter', new ShiftEnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\tdata.preventDefault();\n\n\t\t\t// The hard enter key is handled by the Enter plugin.\n\t\t\tif ( !data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'shiftEnter' );\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @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 enter/enterobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\nimport DomEventData from '@ckeditor/ckeditor5-engine/src/view/observer/domeventdata';\nimport BubblingEventInfo from '@ckeditor/ckeditor5-engine/src/view/observer/bubblingeventinfo';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Enter observer introduces the {@link module:engine/view/document~Document#event:enter} event.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class EnterObserver extends Observer {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst doc = this.document;\n\n\t\tdoc.on( 'keydown', ( evt, data ) => {\n\t\t\tif ( this.isEnabled && data.keyCode == keyCodes.enter ) {\n\t\t\t\tconst event = new BubblingEventInfo( doc, 'enter', doc.selection.getFirstRange() );\n\n\t\t\t\tdoc.fire( event, new DomEventData( doc, data.domEvent, {\n\t\t\t\t\tisSoft: data.shiftKey\n\t\t\t\t} ) );\n\n\t\t\t\t// Stop `keydown` event if `enter` event was stopped.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5/issues/753\n\t\t\t\tif ( event.stop.called ) {\n\t\t\t\t\tevt.stop();\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {}\n}\n\n/**\n * Event fired when the user presses the <kbd>Enter</kbd> key.\n *\n * Note: This event is fired by the {@link module:enter/enterobserver~EnterObserver observer}\n * (usually registered by the {@link module:enter/enter~Enter Enter feature} and\n * {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature}).\n *\n * @event module:engine/view/document~Document#event:enter\n * @param {module:engine/view/observer/domeventdata~DomEventData} data\n * @param {Boolean} data.isSoft Whether it's a soft enter (<kbd>Shift</kbd>+<kbd>Enter</kbd>) or hard enter (<kbd>Enter</kbd>).\n */\n","/**\n * @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 enter/entercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getCopyOnEnterAttributes } from './utils';\n\n/**\n * Enter command. It is used by the {@link module:enter/enter~Enter Enter feature} to handle the <kbd>Enter</kbd> key.\n *\n * @extends module:core/command~Command\n */\nexport default class EnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tenterBlock( this.editor.model, writer, doc.selection, model.schema );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n}\n\n// Creates a new block in the way that the <kbd>Enter</kbd> key is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\n// @param {module:engine/model/schema~Schema} schema\nfunction enterBlock( model, writer, selection, schema ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Don't touch the roots and other limit elements.\n\tif ( schema.isLimit( startElement ) || schema.isLimit( endElement ) ) {\n\t\t// Delete the selected content but only if inside a single limit element.\n\t\t// Abort, when crossing limit elements boundary (e.g. <limit1>x[x</limit1>donttouchme<limit2>y]y</limit2>).\n\t\t// This is an edge case and it's hard to tell what should actually happen because such a selection\n\t\t// is not entirely valid.\n\t\tif ( !isSelectionEmpty && startElement == endElement ) {\n\t\t\tmodel.deleteContent( selection );\n\t\t}\n\n\t\treturn;\n\t}\n\n\tif ( isSelectionEmpty ) {\n\t\tconst attributesToCopy = getCopyOnEnterAttributes( writer.model.schema, selection.getAttributes() );\n\t\tsplitBlock( writer, range.start );\n\t\twriter.setSelectionAttribute( attributesToCopy );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\tif ( leaveUnmerged ) {\n\t\t\t// Partially selected elements.\n\t\t\t//\n\t\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x</h><h>^x</h>\n\t\t\tif ( isContainedWithinOneElement ) {\n\t\t\t\tsplitBlock( writer, selection.focus );\n\t\t\t}\n\t\t\t// Selection over multiple elements.\n\t\t\t//\n\t\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t\telse {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction splitBlock( writer, splitPos ) {\n\twriter.split( splitPos );\n\twriter.setSelection( splitPos.parent.nextSibling, 0 );\n}\n","/**\n * @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 enter/enter\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport EnterCommand from './entercommand';\nimport EnterObserver from './enterobserver';\n\n/**\n * This plugin handles the <kbd>Enter</kbd> key (hard line break) in the editor.\n *\n * See also the {@link module:enter/shiftenter~ShiftEnter} plugin.\n *\n * For more information about this feature see the {@glink api/enter package page}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Enter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Enter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'enter', new EnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\tdata.preventDefault();\n\n\t\t\t// The soft enter key is handled by the ShiftEnter plugin.\n\t\t\tif ( data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'enter' );\n\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @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 enter/utils\n */\n\n/**\n * Returns attributes that should be preserved on the enter key.\n *\n * Filtering is realized based on `copyOnEnter` attribute property. Read more about attribute properties\n * {@link module:engine/model/schema~Schema#setAttributeProperties here}.\n *\n * @param {module:engine/model/schema~Schema} schema\n * @param {Iterable.<*>} allAttributes attributes to filter.\n * @returns {Iterable.<*>}\n */\nexport function* getCopyOnEnterAttributes( schema, allAttributes ) {\n\tfor ( const attribute of allAttributes ) {\n\t\tif ( attribute && schema.getAttributeProperties( attribute[ 0 ] ).copyOnEnter ) {\n\t\t\tyield attribute;\n\t\t}\n\t}\n}\n"],"sourceRoot":""}