Use text nodes content directly instead of stringifying using data pr…

…ocessor,

as suggested by @oleq at #5901 (comment).
Ignore HTML elements inside `<pre><code>`.
Closes: #5901.

packages/ckeditor5-code-block/src/codeblockediting.js

@@ -128,7 +128,7 @@ export default class CodeBlockEditing extends Plugin {
 		editor.editing.downcastDispatcher.on( 'insert:codeBlock', modelToViewCodeBlockInsertion( model, normalizedLanguagesDefs, true ) );
 		editor.data.downcastDispatcher.on( 'insert:codeBlock', modelToViewCodeBlockInsertion( model, normalizedLanguagesDefs ) );
 		editor.data.downcastDispatcher.on( 'insert:softBreak', modelToDataViewSoftBreakInsertion( model ), { priority: 'high' } );
-		editor.data.upcastDispatcher.on( 'element:pre', dataViewToModelCodeBlockInsertion( editor.data, normalizedLanguagesDefs ) );
+		editor.data.upcastDispatcher.on( 'element:pre', dataViewToModelCodeBlockInsertion( editor.editing.view, normalizedLanguagesDefs ) );
 
 		// Intercept the clipboard input (paste) when the selection is anchored in the code block and force the clipboard
 		// data to be pasted as a single plain text. Otherwise, the code lines will split the code block and

packages/ckeditor5-code-block/src/converters.js

@@ -126,12 +126,12 @@ export function modelToDataViewSoftBreakInsertion( model ) {
  *
  *		<codeBlock language="javascript">foo();<softBreak></softBreak>bar();</codeBlock>
  *
- * @param {module:engine/controller/datacontroller~DataController} dataController
+ * @param {module:engine/view/view~View} editingView
  * @param {Array.<module:code-block/codeblock~CodeBlockLanguageDefinition>} languageDefs The normalized language
  * configuration passed to the feature.
  * @returns {Function} Returns a conversion callback.
  */
-export function dataViewToModelCodeBlockInsertion( dataController, languageDefs ) {
+export function dataViewToModelCodeBlockInsertion( editingView, languageDefs ) {
 	// Language names associated with CSS classes:
 	//
 	//		{
@@ -183,8 +183,12 @@ export function dataViewToModelCodeBlockInsertion( dataController, languageDefs
 			writer.setAttribute( 'language', defaultLanguageName, codeBlock );
 		}
 
-		const stringifiedElement = dataController.processor.toData( viewChild );
-		const textData = extractDataFromCodeElement( stringifiedElement );
+		// HTML elements are invalid content for `<code>`.
+		// Read only text nodes.
+		const textData = [ ...editingView.createRangeIn( viewChild ) ]
+			.filter( current => current.type === 'text' )
+			.map( ( { item } ) => item.data )
+			.join( '' );
 		const fragment = rawSnippetTextToModelDocumentFragment( writer, textData );
 
 		writer.append( fragment, codeBlock );
@@ -234,14 +238,3 @@ export function dataViewToModelCodeBlockInsertion( dataController, languageDefs
 		}
 	};
 }
-
-// Returns content of `<pre></pre>` with unescaped html inside.
-//
-// @param {String} stringifiedElement
-function extractDataFromCodeElement( stringifiedElement ) {
-	const data = new RegExp( /^<code[^>]*>([\S\s]*)<\/code>$/ ).exec( stringifiedElement )[ 1 ];
-
-	return data
-		.replace( /&lt;/g, '<' )
-		.replace( /&gt;/g, '>' );
-}

packages/ckeditor5-code-block/tests/codeblockediting.js

@@ -889,29 +889,39 @@ describe( 'CodeBlockEditing', () => {
 			);
 		} );
 
+		// Undesired by expected. There is an issue with identifying the correct filler type.
+		// <code> is inline, so dom-to-view converter expects an inline filler.
+		it( 'should convert pre > code with only &nbsp; inside to a codeBlock with &nbsp;', () => {
+			editor.setData( '<pre><code>&nbsp;</code></pre>' );
+
+			expect( getModelData( model ) ).to.equal(
+				'<codeBlock language="plaintext">[]\u00a0</codeBlock>'
+			);
+		} );
+
 		it( 'should convert pre > code with HTML inside', () => {
 			editor.setData( '<pre><code><p>Foo</p>\n<p>Bar</p></code></pre>' );
 
 			expect( getModelData( model ) ).to.equal(
 				'<codeBlock language="plaintext">[]' +
-					'<p>Foo</p>' +
+					'Foo' +
 					'<softBreak></softBreak>' +
-					'<p>Bar</p>' +
+					'Bar' +
 				'</codeBlock>'
 			);
 		} );
 
-		it( 'should convert pre > code tag with HTML and nested pre > code tag', () => {
-			editor.setData( '<pre><code><p>Foo</p><pre>Bar</pre><p>Biz</p></code></pre>' );
+		it( 'should convert pre > code tag with HTML and nested pre > code tag and use only the text content of invalid HTML tags', () => {
+			editor.setData( '<pre><code><p>Foo</p><pre><code>Bar</code></pre><p>Biz</p></code></pre>' );
 
 			expect( getModelData( model ) ).to.equal(
-				'<codeBlock language="plaintext">[]<p>Foo</p><pre>Bar</pre><p>Biz</p></codeBlock>' );
+				'<codeBlock language="plaintext">[]FooBarBiz</codeBlock>' );
 		} );
 
 		it( 'should convert pre > code tag with escaped html content', () => {
-			editor.setData( '<pre><code>&lt;div&gt;&lt;p&gt;Foo&lt;/p&gt;&lt;/div&gt;</code></pre>' );
+			editor.setData( '<pre><code>&lt;div&gt;&lt;p&gt;Foo&apos;s&amp;&quot;bar&quot;&lt;/p&gt;&lt;/div&gt;</code></pre>' );
 
-			expect( getModelData( model ) ).to.equal( '<codeBlock language="plaintext">[]<div><p>Foo</p></div></codeBlock>' );
+			expect( getModelData( model ) ).to.equal( '<codeBlock language="plaintext">[]<div><p>Foo\'s&"bar"</p></div></codeBlock>' );
 		} );
 
 		it( 'should be overridable', () => {