text: /**
   * @license Copyright (c) 2003-2022, CKSource - Holding sp. z o.o. All rights reserved.
   * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
   */
  
  import Model from '../../../src/model/model';
  import DocumentFragment from '../../../src/model/documentfragment';
  import Element from '../../../src/model/element';
  import Text from '../../../src/model/text';
  import TextProxy from '../../../src/model/textproxy';
  import Position from '../../../src/model/position';
  import Range from '../../../src/model/range';
  import * as utils from '../../../src/model/operation/utils';
  import { getData } from '../../../src/dev-utils/model';
  import { expectToThrowCKEditorError } from '@ckeditor/ckeditor5-utils/tests/_utils/utils';
  
  let model, doc, root;
  
  describe( 'Operation utils', () => {
  	beforeEach( () => {
  		model = new Model();
  		doc = model.document;
  		model.schema.extend( '$text', { allowIn: '$root' } );
  
  		root = doc.createRoot();
  
  		// index:	0001112333
  		// offset:	0123456789
  		// data:	foobarIxyz
  		// bold:	___BBBB___
  		root._appendChild( [
  			new Text( 'foo' ),
  			new Text( 'bar', { bold: true } ),
  			new Element( 'imageBlock', { src: 'img.jpg' } ),
  			new Text( 'xyz' )
  		] );
  	} );
  
  	describe( 'insert', () => {
  		it( 'should insert nodes between nodes', () => {
  			utils._insert( Position._createAt( root, 3 ), [ 'xxx', new Element( 'p' ) ] );
  
  			expectData( 'fooxxx<p></p><$text bold="true">bar</$text><imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  
  		it( 'should split text node if nodes at inserted at offset inside text node', () => {
  			utils._insert( Position._createAt( root, 5 ), new Element( 'p' ) );
  
  			expectData( 'foo<$text bold="true">ba</$text><p></p><$text bold="true">r</$text><imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  
  		it( 'should merge text nodes if possible', () => {
  			utils._insert( Position._createAt( root, 3 ), new Text( 'xxx', { bold: true } ) );
  
  			expectData( 'foo<$text bold="true">xxxbar</$text><imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  	} );
  
  	describe( 'remove', () => {
  		it( 'should remove nodes in given range', () => {
  			const range = new Range( Position._createAt( root, 3 ), Position._createAt( root, 6 ) );
  			utils._remove( range );
  
  			expectData( 'foo<imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  
  		it( 'should split text node if range starts or ends inside text node', () => {
  			const range = new Range( Position._createAt( root, 1 ), Position._createAt( root, 5 ) );
  			utils._remove( range );
  
  			expectData( 'f<$text bold="true">r</$text><imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  
  		it( 'should merge text nodes if possible', () => {
  			const range = new Range( Position._createAt( root, 3 ), Position._createAt( root, 7 ) );
  			utils._remove( range );
  
  			expectData( 'fooxyz' );
  			expect( root.childCount ).to.equal( 1 );
  		} );
  
  		it( 'should throw if given range is not flat', () => {
  			expectToThrowCKEditorError( () => {
  				utils._remove( new Range( new Position( root, [ 0 ] ), new Position( root, [ 1, 2 ] ) ) );
  			}, /operation-utils-remove-range-not-flat/ );
  		} );
  	} );
  
  	describe( 'move', () => {
  		it( 'should move a range of nodes', () => {
  			const range = new Range( Position._createAt( root, 3 ), Position._createAt( root, 6 ) );
  			utils._move( range, Position._createAt( root, 0 ) );
  
  			expectData( '<$text bold="true">bar</$text>foo<imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  
  		it( 'should correctly move if target position is in same element as moved range, but after range', () => {
  			const range = new Range( Position._createAt( root, 3 ), Position._createAt( root, 6 ) );
  			utils._move( range, Position._createAt( root, 10 ) );
  
  			expectData( 'foo<imageBlock src="img.jpg"></imageBlock>xyz<$text bold="true">bar</$text>' );
  		} );
  
  		it( 'should throw if given range is not flat', () => {
  			expectToThrowCKEditorError( () => {
  				utils._move( new Range( new Position( root, [ 0 ] ), new Position( root, [ 1, 2 ] ) ), null );
  			}, /operation-utils-move-range-not-flat/ );
  		} );
  	} );
  
  	describe( 'setAttribute', () => {
  		it( 'should set attribute on given range of nodes', () => {
  			const range = new Range( Position._createAt( root, 6 ), Position._createAt( root, 8 ) );
  			utils._setAttribute( range, 'newAttr', true );
  
  			expectData( 'foo<$text bold="true">bar</$text>' +
  				'<imageBlock newAttr="true" src="img.jpg"></imageBlock>' +
  				'<$text newAttr="true">x</$text>yz'
  			);
  		} );
  
  		it( 'should remove attribute if null was passed as a value', () => {
  			const range = new Range( Position._createAt( root, 6 ), Position._createAt( root, 7 ) );
  			utils._setAttribute( range, 'src', null );
  
  			expectData( 'foo<$text bold="true">bar</$text><imageBlock></imageBlock>xyz' );
  		} );
  
  		it( 'should merge nodes if possible', () => {
  			const range = new Range( Position._createAt( root, 0 ), Position._createAt( root, 3 ) );
  			utils._setAttribute( range, 'bold', true );
  
  			expectData( '<$text bold="true">foobar</$text><imageBlock src="img.jpg"></imageBlock>xyz' );
  		} );
  	} );
  } );
  
  describe( 'normalizeNodes', () => {
  	it( 'should change single object into an array', () => {
  		const p = new Element( 'p' );
  
  		expect( utils._normalizeNodes( p ) ).to.deep.equal( [ p ] );
  	} );
  
  	it( 'should change strings to text nodes', () => {
  		const text = utils._normalizeNodes( 'abc' )[ 0 ];
  
  		expect( text ).to.be.instanceof( Text );
  		expect( text.data ).to.equal( 'abc' );
  	} );
  
  	it( 'should change text proxies to text nodes', () => {
  		const textNode = new Text( 'abc' );
  		const textProxy = new TextProxy( textNode, 1, 1 );
  
  		const text = utils._normalizeNodes( textProxy )[ 0 ];
  
  		expect( text ).to.be.instanceof( Text );
  		expect( text.data ).to.equal( 'b' );
  	} );
  
  	it( 'should not change elements', () => {
  		const p = new Element( 'p' );
  
  		expect( utils._normalizeNodes( p )[ 0 ] ).to.equal( p );
  	} );
  
  	it( 'should omit unrecognized objects', () => {
  		expect( utils._normalizeNodes( 1 ) ).to.deep.equal( [] );
  	} );
  
  	it( 'should accept arrays', () => {
  		const text = new Text( 'foo', { bold: true } );
  		const image = new Element( 'imageBlock' );
  		const nodes = [ 'abc', text, image, 1, 'xyz' ];
  
  		const normalized = utils._normalizeNodes( nodes );
  
  		expect( normalized[ 0 ] ).to.be.instanceof( Text );
  		expect( normalized[ 1 ] ).to.equal( text );
  		expect( normalized[ 2 ] ).to.equal( image );
  		expect( normalized[ 3 ] ).to.be.instanceof( Text );
  	} );
  
  	it( 'should merge text nodes if mergeTextNodes flag is set to true', () => {
  		const normalized = utils._normalizeNodes( [ 'foo', 'bar' ], true );
  
  		expect( normalized.length ).to.equal( 1 );
  		expect( normalized[ 0 ].data ).to.equal( 'foobar' );
  	} );
  
  	it( 'should replace document fragment by the list of it\'s children', () => {
  		const nodes = [
  			new Text( 'foo', { bold: true } ),
  			new DocumentFragment( [ new Text( 'bar', { bold: true } ), new Element( 'imageBlock' ) ] ),
  			'xyz'
  		];
  
  		const normalized = utils._normalizeNodes( nodes, true );
  
  		expect( normalized[ 0 ] ).to.be.instanceof( Text );
  		expect( normalized[ 0 ].getAttribute( 'bold' ) ).to.be.true;
  		expect( normalized[ 0 ].data ).to.equal( 'foobar' );
  		expect( normalized[ 1 ].name ).to.equal( 'imageBlock' );
  		expect( normalized[ 2 ].data ).to.equal( 'xyz' );
  	} );
  } );
  
  function expectData( html ) {
  	expect( getData( model, { withoutSelection: true } ) ).to.equal( html );
  }
  