T/1: Initial implementation of Highlight editing without UI.

package.json

@@ -7,8 +7,18 @@
     "ckeditor5-feature"
   ],
   "dependencies": {
+    "@ckeditor/ckeditor5-core": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-engine": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-ui": "^1.0.0-alpha.1"
   },
   "devDependencies": {
+    "@ckeditor/ckeditor5-block-quote": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-enter": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-heading": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-image": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-list": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-paragraph": "^1.0.0-alpha.1",
+    "@ckeditor/ckeditor5-typing": "^1.0.0-alpha.1",
     "eslint": "^4.8.0",
     "eslint-config-ckeditor5": "^1.0.6",
     "husky": "^0.14.3",

src/highlight.js

@@ -0,0 +1,36 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/**
+ * @module highlight/highlight
+ */
+
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+
+import HighlightEditing from './highlightediting';
+import HighlightUI from './highlightui';
+
+/**
+ * The highlight plugin.
+ *
+ * It requires {@link module:highlight/highlightediting~HighlightEditing} and {@link module:highlight/highlightui~HighlightUI} plugins.
+ *
+ * @extends module:core/plugin~Plugin
+ */
+export default class Highlight extends Plugin {
+	/**
+	 * @inheritDoc
+	 */
+	static get requires() {
+		return [ HighlightEditing, HighlightUI ];
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	static get pluginName() {
+		return 'Highlight';
+	}
+}

src/highlightcommand.js

@@ -0,0 +1,68 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/**
+ * @module highlight/highlightcommand
+ */
+
+import Command from '@ckeditor/ckeditor5-core/src/command';
+
+/**
+ * The highlight command. It is used by the {@link module:highlight/highlight~HighlightEditing highlight feature}
+ * to apply text highlighting.
+ *
+ * @extends module:core/command~Command
+ */
+export default class HighlightCommand extends Command {
+	/**
+	 * @inheritDoc
+	 */
+	refresh() {
+		const doc = this.editor.document;
+
+		this.value = doc.selection.getAttribute( 'highlight' );
+		this.isEnabled = doc.schema.checkAttributeInSelection( doc.selection, 'highlight' );
+	}
+
+	/**
+	 * Executes the command.
+	 *
+	 * @protected
+	 * @param {Object} [options] Options for the executed command.
+	 * @param {String} options.class Name of highlighter class.
+	 * @param {module:engine/model/batch~Batch} [options.batch] A batch to collect all the change steps.
+	 * A new batch will be created if this option is not set.
+	 */
+	execute( options = {} ) {
+		const doc = this.editor.document;
+		const selection = doc.selection;
+
+		// Do not apply highlight no collapsed selection.
+		if ( selection.isCollapsed ) {
+			return;
+		}
+
+		doc.enqueueChanges( () => {
+			const ranges = doc.schema.getValidRanges( selection.getRanges(), 'highlight' );
+			const batch = options.batch || doc.batch();
+
+			for ( const range of ranges ) {
+				if ( options.class ) {
+					batch.setAttribute( range, 'highlight', options.class );
+				} else {
+					batch.removeAttribute( range, 'highlight' );
+				}
+			}
+		} );
+	}
+}
+
+/**
+ * Holds current highlight class. If there is no highlight in selection then value will be undefined.
+ *
+ * @observable
+ * @readonly
+ * @member {undefined|String} HighlightCommand#value
+ */

src/highlightediting.js

@@ -0,0 +1,121 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/**
+ * @module highlight/highlightediting
+ */
+
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+
+import buildViewConverter from '@ckeditor/ckeditor5-engine/src/conversion/buildviewconverter';
+import buildModelConverter from '@ckeditor/ckeditor5-engine/src/conversion/buildmodelconverter';
+
+import AttributeElement from '@ckeditor/ckeditor5-engine/src/view/attributeelement';
+
+import HighlightCommand from './highlightcommand';
+
+/**
+ * The highlight editing feature. It introduces `highlight` command which allow to highlight selected text with defined 'marker' or 'pen'.
+ *
+ * @extends module:core/plugin~Plugin
+ */
+export default class HighlightEditing extends Plugin {
+	/**
+	 * @inheritDoc
+	 */
+	init() {
+		const editor = this.editor;
+		const data = editor.data;
+		const editing = editor.editing;
+
+		editor.config.define( 'highlight', [
+			{ class: 'marker', title: 'Marker', color: '#ffff66', type: 'marker' },
+			{ class: 'marker-green', title: 'Green Marker', color: '#66ff00', type: 'marker' },
+			{ class: 'marker-pink', title: 'Pink Marker', color: '#ff6fff', type: 'marker' },
+			{ class: 'pen-red', title: 'Red Pen', color: '#ff0000', type: 'pen' },
+			{ class: 'pen-blue', title: 'Blue Pen', color: '#0000ff', type: 'pen' }
+		] );
+
+		// Allow highlight attribute on all elements
+		editor.document.schema.allow( { name: '$inline', attributes: 'highlight', inside: '$block' } );
+
+		// Convert highlight attribute to a mark element with associated class.
+		buildModelConverter()
+			.for( data.modelToView, editing.modelToView )
+			.fromAttribute( 'highlight' )
+			.toElement( data => new AttributeElement( 'mark', { class: data } ) );
+
+		const configuredClasses = editor.config.get( 'highlight' ).map( config => config.class );
+
+		// Convert `mark` attribute with class name to model's highlight attribute.
+		buildViewConverter()
+			.for( data.viewToModel )
+			.fromElement( 'mark' )
+			.toAttribute( viewElement => {
+				const viewClassNames = [ ...viewElement.getClassNames() ];
+
+				if ( !viewClassNames.length ) {
+					return;
+				}
+
+				const highlightClassNames = viewClassNames.filter( className => configuredClasses.includes( className ) );
+
+				if ( !highlightClassNames.length ) {
+					return;
+				}
+
+				return { key: 'highlight', value: highlightClassNames[ 0 ] };
+			} );
+
+		editor.commands.add( 'highlight', new HighlightCommand( editor ) );
+	}
+}
+
+/**
+ * Highlight option descriptor.
+ *
+ * @typedef {Object} module:highlight/highlightediting~HeadingOption
+ * @property {String} class The class which is used to differentiate highlighters.
+ * @property {String} title The user-readable title of the option.
+ * @property {String} color Color used for highlighter. Should be coherent with CSS class definition.
+ * @property {'marker'|'pen'} type The type of highlighter. Either "marker" - will use #color as background name
+ * of the view element that will be used to represent the model element in the view.
+ */
+
+/**
+ * The configuration of the {@link module:highlight/highlightediting~HighlightEditing Highlight feature}.
+ *
+ * Read more in {@link module:highlight/highlightediting~HighlightEditingConfig}.
+ *
+ * @member {module:highlight/highlightediting~HighlightEditingConfig} module:core/editor/editorconfig~EditorConfig#alignment
+ */
+
+/**
+ * The configuration of the {@link module:highlight/highlightediting~HighlightEditing Highlight feature}.
+ *
+ *        ClassicEditor
+ *            .create( editorElement, {
+ * 				highlight:  ... // Highlight feature config.
+ *			} )
+ *            .then( ... )
+ *            .catch( ... );
+ *
+ * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.
+ *
+ * @interface HighlightEditingConfig
+ */
+
+/**
+ * Available highlighters options.
+ *
+ * There are two types of highlighters:
+ * - 'marker' - rendered as `<mark>` element with defined background color.
+ * - 'pen' - rendered as `<mark>` element with defined foreground (font) color.
+ *
+ * Note: Each highlighter must have it's own CSS class defined to properly match content data. Also it is advised
+ * that color value should match the values defined in content CSS stylesheet.
+ *
+ * @member {Array.<module:heading/heading~HeadingOption>} module:heading/heading~HeadingConfig#options
+ */

src/highlightui.js

@@ -0,0 +1,33 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/**
+ * @module highlight/highlightui
+ */
+
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+
+import HighlightEditing from './highlightediting';
+
+/**
+ * The default Highlight UI plugin.
+ *
+ * @extends module:core/plugin~Plugin
+ */
+export default class HighlightUI extends Plugin {
+	/**
+	 * @inheritDoc
+	 */
+	static get requires() {
+		return [ HighlightEditing ];
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	static get pluginName() {
+		return 'HighlightUI';
+	}
+}

tests/highlight.js

@@ -0,0 +1,39 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/* global document */
+
+import Highlight from './../src/highlight';
+import HighlightEditing from './../src/highlightediting';
+import HighlightUI from './../src/highlightui';
+
+import ClassicTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/classictesteditor';
+
+describe( 'Highlight', () => {
+	let editor, element;
+
+	beforeEach( () => {
+		element = document.createElement( 'div' );
+		document.body.appendChild( element );
+
+		return ClassicTestEditor
+			.create( element, {
+				plugins: [ Highlight ]
+			} )
+			.then( newEditor => {
+				editor = newEditor;
+			} );
+	} );
+
+	afterEach( () => {
+		element.remove();
+
+		return editor.destroy();
+	} );
+
+	it( 'requires HighlightEditing and HighlightUI', () => {
+		expect( Highlight.requires ).to.deep.equal( [ HighlightEditing, HighlightUI ] );
+	} );
+} );