WYSIWYG: Added text direction support for code editor popup

Editor popup will now reflect the direction of the opened code block.
This also updates in-editor codemirror instances to correcly reflect/use
the direction if set on the inner code elem.

This also defaults new code blocks, when in RTL languages, to be started
in LTR, which can then be changed via in-editor direction controls if
needed. This is on the assumption that most code will be LTR (could not
find much examples of RTL code use).

Fixes #4943

Author: ssddanbrown

resources/js/code/index.mjs

@@ -38,6 +38,23 @@ function addCopyIcon(editorView) {
     });
 }
 
+/**
+ * @param {HTMLElement} codeElem
+ * @returns {String}
+ */
+function getDirectionFromCodeBlock(codeElem) {
+    let dir = '';
+    const innerCodeElem = codeElem.querySelector('code');
+
+    if (innerCodeElem && innerCodeElem.hasAttribute('dir')) {
+        dir = innerCodeElem.getAttribute('dir');
+    } else if (codeElem.hasAttribute('dir')) {
+        dir = codeElem.getAttribute('dir');
+    }
+
+    return dir;
+}
+
 /**
  * Add code highlighting to a single element.
  * @param {HTMLElement} elem
@@ -48,16 +65,14 @@ function highlightElem(elem) {
     const content = elem.textContent.trimEnd();
 
     let langName = '';
-    let innerCodeDirection = '';
     if (innerCodeElem !== null) {
         langName = innerCodeElem.className.replace('language-', '');
-        innerCodeDirection = innerCodeElem.getAttribute('dir');
     }
 
     const wrapper = document.createElement('div');
     elem.parentNode.insertBefore(wrapper, elem);
 
-    const direction = innerCodeDirection || elem.getAttribute('dir') || '';
+    const direction = getDirectionFromCodeBlock(elem);
     if (direction) {
         wrapper.setAttribute('dir', direction);
     }

resources/js/components/code-editor.js

@@ -129,14 +129,15 @@ export class CodeEditor extends Component {
         this.hide();
     }
 
-    async open(code, language, saveCallback, cancelCallback) {
+    async open(code, language, direction, saveCallback, cancelCallback) {
         this.languageInput.value = language;
         this.saveCallback = saveCallback;
         this.cancelCallback = cancelCallback;
 
         await this.show();
         this.languageInputChange(language);
         this.editor.setContent(code);
+        this.setDirection(direction);
     }
 
     async show() {
@@ -156,6 +157,15 @@ export class CodeEditor extends Component {
         });
     }
 
+    setDirection(direction) {
+        const target = this.editorInput.parentElement;
+        if (direction) {
+            target.setAttribute('dir', direction);
+        } else {
+            target.removeAttribute('dir');
+        }
+    }
+
     hide() {
         this.getPopup().hide();
         this.addHistory();

resources/js/wysiwyg/plugin-codeeditor.js

@@ -6,13 +6,14 @@ function elemIsCodeBlock(elem) {
  * @param {Editor} editor
  * @param {String} code
  * @param {String} language
+ * @param {String} direction
  * @param {function(string, string)} callback (Receives (code: string,language: string)
  */
-function showPopup(editor, code, language, callback) {
+function showPopup(editor, code, language, direction, callback) {
     /** @var {CodeEditor} codeEditor * */
     const codeEditor = window.$components.first('code-editor');
     const bookMark = editor.selection.getBookmark();
-    codeEditor.open(code, language, (newCode, newLang) => {
+    codeEditor.open(code, language, direction, (newCode, newLang) => {
         callback(newCode, newLang);
         editor.focus();
         editor.selection.moveToBookmark(bookMark);
@@ -27,7 +28,8 @@ function showPopup(editor, code, language, callback) {
  * @param {CodeBlockElement} codeBlock
  */
 function showPopupForCodeBlock(editor, codeBlock) {
-    showPopup(editor, codeBlock.getContent(), codeBlock.getLanguage(), (newCode, newLang) => {
+    const direction = codeBlock.getAttribute('dir') || '';
+    showPopup(editor, codeBlock.getContent(), codeBlock.getLanguage(), direction, (newCode, newLang) => {
         codeBlock.setContent(newCode, newLang);
     });
 }
@@ -179,13 +181,17 @@ function register(editor) {
             showPopupForCodeBlock(editor, selectedNode);
         } else {
             const textContent = editor.selection.getContent({format: 'text'});
-            showPopup(editor, textContent, '', (newCode, newLang) => {
+            const direction = document.dir === 'rtl' ? 'ltr' : '';
+            showPopup(editor, textContent, '', direction, (newCode, newLang) => {
                 const pre = doc.createElement('pre');
                 const code = doc.createElement('code');
                 code.classList.add(`language-${newLang}`);
                 code.innerText = newCode;
-                pre.append(code);
+                if (direction) {
+                    pre.setAttribute('dir', direction);
+                }
 
+                pre.append(code);
                 editor.insertContent(pre.outerHTML);
             });
         }
@@ -205,7 +211,8 @@ function register(editor) {
                     contenteditable: 'false',
                 });
 
-                const direction = el.attr('dir');
+                const childCodeBlock = el.children().filter(child => child.name === 'code')[0] || null;
+                const direction = el.attr('dir') || (childCodeBlock && childCodeBlock.attr('dir')) || '';
                 if (direction) {
                     wrapper.attr('dir', direction);
                 }

resources/sass/_components.scss

@@ -182,7 +182,7 @@
   flex: 0;
   .popup-title {
     color: #FFF;
-    margin-right: auto;
+    margin-inline-end: auto;
     padding: 8px $-m;
   }
   &.flex-container-row {