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EDIT :: code-editor.js

/**
 * @output wp-admin/js/code-editor.js
 */

if ( 'undefined' === typeof window.wp ) {
	/**
	 * @namespace wp
	 */
	window.wp = {};
}
if ( 'undefined' === typeof window.wp.codeEditor ) {
	/**
	 * @namespace wp.codeEditor
	 */
	window.wp.codeEditor = {};
}

( function( $, wp ) {
	'use strict';

/**
	 * Default settings for code editor.
	 *
	 * @since 4.9.0
	 * @type {object}
	 */
	wp.codeEditor.defaultSettings = {
		codemirror: {},
		csslint: {},
		htmlhint: {},
		jshint: {},
		onTabNext: function() {},
		onTabPrevious: function() {},
		onChangeLintingErrors: function() {},
		onUpdateErrorNotice: function() {}
	};

/**
	 * Configure linting.
	 *
	 * @param {CodeMirror} editor - Editor.
	 * @param {Object}     settings - Code editor settings.
	 * @param {Object}     settings.codeMirror - Settings for CodeMirror.
	 * @param {Function}   settings.onChangeLintingErrors - Callback for when there are changes to linting errors.
	 * @param {Function}   settings.onUpdateErrorNotice - Callback to update error notice.
	 *
	 * @return {void}
	 */
	function configureLinting( editor, settings ) { // eslint-disable-line complexity
		var currentErrorAnnotations = [], previouslyShownErrorAnnotations = [];

/**
		 * Call the onUpdateErrorNotice if there are new errors to show.
		 *
		 * @return {void}
		 */
		function updateErrorNotice() {
			if ( settings.onUpdateErrorNotice && ! _.isEqual( currentErrorAnnotations, previouslyShownErrorAnnotations ) ) {
				settings.onUpdateErrorNotice( currentErrorAnnotations, editor );
				previouslyShownErrorAnnotations = currentErrorAnnotations;
			}
		}

/**
		 * Get lint options.
		 *
		 * @return {Object} Lint options.
		 */
		function getLintOptions() { // eslint-disable-line complexity
			var options = editor.getOption( 'lint' );

if ( ! options ) {
				return false;
			}

if ( true === options ) {
				options = {};
			} else if ( _.isObject( options ) ) {
				options = $.extend( {}, options );
			}

/*
			 * Note that rules must be sent in the "deprecated" lint.options property 
			 * to prevent linter from complaining about unrecognized options.
			 * See <https://github.com/codemirror/CodeMirror/pull/4944>.
			 */
			if ( ! options.options ) {
				options.options = {};
			}

// Configure JSHint.
			if ( 'javascript' === settings.codemirror.mode && settings.jshint ) {
				$.extend( options.options, settings.jshint );
			}

// Configure CSSLint.
			if ( 'css' === settings.codemirror.mode && settings.csslint ) {
				$.extend( options.options, settings.csslint );
			}

// Configure HTMLHint.
			if ( 'htmlmixed' === settings.codemirror.mode && settings.htmlhint ) {
				options.options.rules = $.extend( {}, settings.htmlhint );

if ( settings.jshint ) {
					options.options.rules.jshint = settings.jshint;
				}
				if ( settings.csslint ) {
					options.options.rules.csslint = settings.csslint;
				}
			}

// Wrap the onUpdateLinting CodeMirror event to route to onChangeLintingErrors and onUpdateErrorNotice.
			options.onUpdateLinting = (function( onUpdateLintingOverridden ) {
				return function( annotations, annotationsSorted, cm ) {
					var errorAnnotations = _.filter( annotations, function( annotation ) {
						return 'error' === annotation.severity;
					} );

if ( onUpdateLintingOverridden ) {
						onUpdateLintingOverridden.apply( annotations, annotationsSorted, cm );
					}

// Skip if there are no changes to the errors.
					if ( _.isEqual( errorAnnotations, currentErrorAnnotations ) ) {
						return;
					}

currentErrorAnnotations = errorAnnotations;

if ( settings.onChangeLintingErrors ) {
						settings.onChangeLintingErrors( errorAnnotations, annotations, annotationsSorted, cm );
					}

/*
					 * Update notifications when the editor is not focused to prevent error message
					 * from overwhelming the user during input, unless there are now no errors or there
					 * were previously errors shown. In these cases, update immediately so they can know
					 * that they fixed the errors.
					 */
					if ( ! editor.state.focused || 0 === currentErrorAnnotations.length || previouslyShownErrorAnnotations.length > 0 ) {
						updateErrorNotice();
					}
				};
			})( options.onUpdateLinting );

return options;
		}

editor.setOption( 'lint', getLintOptions() );

// Keep lint options populated.
		editor.on( 'optionChange', function( cm, option ) {
			var options, gutters, gutterName = 'CodeMirror-lint-markers';
			if ( 'lint' !== option ) {
				return;
			}
			gutters = editor.getOption( 'gutters' ) || [];
			options = editor.getOption( 'lint' );
			if ( true === options ) {
				if ( ! _.contains( gutters, gutterName ) ) {
					editor.setOption( 'gutters', [ gutterName ].concat( gutters ) );
				}
				editor.setOption( 'lint', getLintOptions() ); // Expand to include linting options.
			} else if ( ! options ) {
				editor.setOption( 'gutters', _.without( gutters, gutterName ) );
			}

// Force update on error notice to show or hide.
			if ( editor.getOption( 'lint' ) ) {
				editor.performLint();
			} else {
				currentErrorAnnotations = [];
				updateErrorNotice();
			}
		} );

// Update error notice when leaving the editor.
		editor.on( 'blur', updateErrorNotice );

// Work around hint selection with mouse causing focus to leave editor.
		editor.on( 'startCompletion', function() {
			editor.off( 'blur', updateErrorNotice );
		} );
		editor.on( 'endCompletion', function() {
			var editorRefocusWait = 500;
			editor.on( 'blur', updateErrorNotice );

// Wait for editor to possibly get re-focused after selection.
			_.delay( function() {
				if ( ! editor.state.focused ) {
					updateErrorNotice();
				}
			}, editorRefocusWait );
		});

/*
		 * Make sure setting validities are set if the user tries to click Publish
		 * while an autocomplete dropdown is still open. The Customizer will block
		 * saving when a setting has an error notifications on it. This is only
		 * necessary for mouse interactions because keyboards will have already
		 * blurred the field and cause onUpdateErrorNotice to have already been
		 * called.
		 */
		$( document.body ).on( 'mousedown', function( event ) {
			if ( editor.state.focused && ! $.contains( editor.display.wrapper, event.target ) && ! $( event.target ).hasClass( 'CodeMirror-hint' ) ) {
				updateErrorNotice();
			}
		});
	}

/**
	 * Configure tabbing.
	 *
	 * @param {CodeMirror} codemirror - Editor.
	 * @param {Object}     settings - Code editor settings.
	 * @param {Object}     settings.codeMirror - Settings for CodeMirror.
	 * @param {Function}   settings.onTabNext - Callback to handle tabbing to the next tabbable element.
	 * @param {Function}   settings.onTabPrevious - Callback to handle tabbing to the previous tabbable element.
	 *
	 * @return {void}
	 */
	function configureTabbing( codemirror, settings ) {
		var $textarea = $( codemirror.getTextArea() );

codemirror.on( 'blur', function() {
			$textarea.data( 'next-tab-blurs', false );
		});
		codemirror.on( 'keydown', function onKeydown( editor, event ) {
			var tabKeyCode = 9, escKeyCode = 27;

// Take note of the ESC keypress so that the next TAB can focus outside the editor.
			if ( escKeyCode === event.keyCode ) {
				$textarea.data( 'next-tab-blurs', true );
				return;
			}

// Short-circuit if tab key is not being pressed or the tab key press should move focus.
			if ( tabKeyCode !== event.keyCode || ! $textarea.data( 'next-tab-blurs' ) ) {
				return;
			}

// Focus on previous or next focusable item.
			if ( event.shiftKey ) {
				settings.onTabPrevious( codemirror, event );
			} else {
				settings.onTabNext( codemirror, event );
			}

// Reset tab state.
			$textarea.data( 'next-tab-blurs', false );

// Prevent tab character from being added.
			event.preventDefault();
		});
	}

/**
	 * @typedef {object} wp.codeEditor~CodeEditorInstance
	 * @property {object} settings - The code editor settings.
	 * @property {CodeMirror} codemirror - The CodeMirror instance.
	 */

/**
	 * Initialize Code Editor (CodeMirror) for an existing textarea.
	 *
	 * @since 4.9.0
	 *
	 * @param {string|jQuery|Element} textarea - The HTML id, jQuery object, or DOM Element for the textarea that is used for the editor.
	 * @param {Object}                [settings] - Settings to override defaults.
	 * @param {Function}              [settings.onChangeLintingErrors] - Callback for when the linting errors have changed.
	 * @param {Function}              [settings.onUpdateErrorNotice] - Callback for when error notice should be displayed.
	 * @param {Function}              [settings.onTabPrevious] - Callback to handle tabbing to the previous tabbable element.
	 * @param {Function}              [settings.onTabNext] - Callback to handle tabbing to the next tabbable element.
	 * @param {Object}                [settings.codemirror] - Options for CodeMirror.
	 * @param {Object}                [settings.csslint] - Rules for CSSLint.
	 * @param {Object}                [settings.htmlhint] - Rules for HTMLHint.
	 * @param {Object}                [settings.jshint] - Rules for JSHint.
	 *
	 * @return {CodeEditorInstance} Instance.
	 */
	wp.codeEditor.initialize = function initialize( textarea, settings ) {
		var $textarea, codemirror, instanceSettings, instance;
		if ( 'string' === typeof textarea ) {
			$textarea = $( '#' + textarea );
		} else {
			$textarea = $( textarea );
		}

instanceSettings = $.extend( {}, wp.codeEditor.defaultSettings, settings );
		instanceSettings.codemirror = $.extend( {}, instanceSettings.codemirror );

codemirror = wp.CodeMirror.fromTextArea( $textarea[0], instanceSettings.codemirror );

configureLinting( codemirror, instanceSettings );

instance = {
			settings: instanceSettings,
			codemirror: codemirror
		};

if ( codemirror.showHint ) {
			codemirror.on( 'keyup', function( editor, event ) { // eslint-disable-line complexity
				var shouldAutocomplete, isAlphaKey = /^[a-zA-Z]$/.test( event.key ), lineBeforeCursor, innerMode, token;
				if ( codemirror.state.completionActive && isAlphaKey ) {
					return;
				}

// Prevent autocompletion in string literals or comments.
				token = codemirror.getTokenAt( codemirror.getCursor() );
				if ( 'string' === token.type || 'comment' === token.type ) {
					return;
				}

innerMode = wp.CodeMirror.innerMode( codemirror.getMode(), token.state ).mode.name;
				lineBeforeCursor = codemirror.doc.getLine( codemirror.doc.getCursor().line ).substr( 0, codemirror.doc.getCursor().ch );
				if ( 'html' === innerMode || 'xml' === innerMode ) {
					shouldAutocomplete =
						'<' === event.key ||
						'/' === event.key && 'tag' === token.type ||
						isAlphaKey && 'tag' === token.type ||
						isAlphaKey && 'attribute' === token.type ||
						'=' === token.string && token.state.htmlState && token.state.htmlState.tagName;
				} else if ( 'css' === innerMode ) {
					shouldAutocomplete =
						isAlphaKey ||
						':' === event.key ||
						' ' === event.key && /:\s+$/.test( lineBeforeCursor );
				} else if ( 'javascript' === innerMode ) {
					shouldAutocomplete = isAlphaKey || '.' === event.key;
				} else if ( 'clike' === innerMode && 'php' === codemirror.options.mode ) {
					shouldAutocomplete = 'keyword' === token.type || 'variable' === token.type;
				}
				if ( shouldAutocomplete ) {
					codemirror.showHint( { completeSingle: false } );
				}
			});
		}

// Facilitate tabbing out of the editor.
		configureTabbing( codemirror, settings );

return instance;
	};

})( window.jQuery, window.wp );

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EDIT :: code-editor.js