const globalWindow = window; export function CodeJar(editor, highlight, opt = {}) { const options = { tab: '\t', indentOn: /[({\[]$/, moveToNewLine: /^[)}\]]/, spellcheck: false, catchTab: true, preserveIdent: true, addClosing: true, history: true, window: globalWindow, ...opt, }; const window = options.window; const document = window.document; const listeners = []; const history = []; let at = -1; let focus = false; let onUpdate = () => void 0; let prev; // code content prior keydown event editor.setAttribute('contenteditable', 'plaintext-only'); editor.setAttribute('spellcheck', options.spellcheck ? 'true' : 'false'); editor.style.outline = 'none'; editor.style.overflowWrap = 'break-word'; editor.style.overflowY = 'auto'; editor.style.whiteSpace = 'pre-wrap'; const doHighlight = (editor, pos) => { highlight(editor, pos); }; let isLegacy = false; // true if plaintext-only is not supported if (editor.contentEditable !== 'plaintext-only') isLegacy = true; if (isLegacy) editor.setAttribute('contenteditable', 'true'); // PATCH(liquidex): Remove debouncing here. const debounceHighlight = () => { const pos = save(); doHighlight(editor, pos); restore(pos); }; let recording = false; const shouldRecord = (event) => { return !isUndo(event) && !isRedo(event) && event.key !== 'Meta' && event.key !== 'Control' && event.key !== 'Alt' && !event.key.startsWith('Arrow'); }; const debounceRecordHistory = debounce((event) => { if (shouldRecord(event)) { recordHistory(); recording = false; } }, 300); const on = (type, fn) => { listeners.push([type, fn]); editor.addEventListener(type, fn); }; on('keydown', event => { if (event.defaultPrevented) return; prev = toString(); if (options.preserveIdent) handleNewLine(event); else legacyNewLineFix(event); if (options.catchTab) handleTabCharacters(event); if (options.addClosing) handleSelfClosingCharacters(event); if (options.history) { handleUndoRedo(event); if (shouldRecord(event) && !recording) { recordHistory(); recording = true; } } if (isLegacy && !isCopy(event)) restore(save()); // PATCH(liquidex): Do highlighting on keypress for faster feedback. requestAnimationFrame(debounceHighlight); }); on('keyup', event => { if (event.defaultPrevented) return; if (event.isComposing) return; debounceRecordHistory(event); onUpdate(toString()); }); on('focus', _event => { focus = true; }); on('blur', _event => { focus = false; }); on('paste', event => { recordHistory(); handlePaste(event); recordHistory(); onUpdate(toString()); }); on('cut', event => { recordHistory(); handleCut(event); recordHistory(); onUpdate(toString()); }); function save() { const s = getSelection(); const pos = { start: 0, end: 0, dir: undefined }; let { anchorNode, anchorOffset, focusNode, focusOffset } = s; if (!anchorNode || !focusNode) throw 'error1'; // If the anchor and focus are the editor element, return either a full // highlight or a start/end cursor position depending on the selection if (anchorNode === editor && focusNode === editor) { pos.start = (anchorOffset > 0 && editor.textContent) ? editor.textContent.length : 0; pos.end = (focusOffset > 0 && editor.textContent) ? editor.textContent.length : 0; pos.dir = (focusOffset >= anchorOffset) ? '->' : '<-'; return pos; } // Selection anchor and focus are expected to be text nodes, // so normalize them. if (anchorNode.nodeType === Node.ELEMENT_NODE) { const node = document.createTextNode(''); anchorNode.insertBefore(node, anchorNode.childNodes[anchorOffset]); anchorNode = node; anchorOffset = 0; } if (focusNode.nodeType === Node.ELEMENT_NODE) { const node = document.createTextNode(''); focusNode.insertBefore(node, focusNode.childNodes[focusOffset]); focusNode = node; focusOffset = 0; } visit(editor, el => { if (el === anchorNode && el === focusNode) { pos.start += anchorOffset; pos.end += focusOffset; pos.dir = anchorOffset <= focusOffset ? '->' : '<-'; return 'stop'; } if (el === anchorNode) { pos.start += anchorOffset; if (!pos.dir) { pos.dir = '->'; } else { return 'stop'; } } else if (el === focusNode) { pos.end += focusOffset; if (!pos.dir) { pos.dir = '<-'; } else { return 'stop'; } } if (el.nodeType === Node.TEXT_NODE) { if (pos.dir != '->') pos.start += el.nodeValue.length; if (pos.dir != '<-') pos.end += el.nodeValue.length; } }); editor.normalize(); // collapse empty text nodes return pos; } function restore(pos) { const s = getSelection(); let startNode, startOffset = 0; let endNode, endOffset = 0; if (!pos.dir) pos.dir = '->'; if (pos.start < 0) pos.start = 0; if (pos.end < 0) pos.end = 0; // Flip start and end if the direction reversed if (pos.dir == '<-') { const { start, end } = pos; pos.start = end; pos.end = start; } let current = 0; visit(editor, el => { if (el.nodeType !== Node.TEXT_NODE) return; const len = (el.nodeValue || '').length; if (current + len > pos.start) { if (!startNode) { startNode = el; startOffset = pos.start - current; } if (current + len > pos.end) { endNode = el; endOffset = pos.end - current; return 'stop'; } } current += len; }); if (!startNode) startNode = editor, startOffset = editor.childNodes.length; if (!endNode) endNode = editor, endOffset = editor.childNodes.length; // Flip back the selection if (pos.dir == '<-') { [startNode, startOffset, endNode, endOffset] = [endNode, endOffset, startNode, startOffset]; } { // If nodes not editable, create a text node. const startEl = uneditable(startNode); if (startEl) { const node = document.createTextNode(''); startEl.parentNode?.insertBefore(node, startEl); startNode = node; startOffset = 0; } const endEl = uneditable(endNode); if (endEl) { const node = document.createTextNode(''); endEl.parentNode?.insertBefore(node, endEl); endNode = node; endOffset = 0; } } s.setBaseAndExtent(startNode, startOffset, endNode, endOffset); editor.normalize(); // collapse empty text nodes } function uneditable(node) { while (node && node !== editor) { if (node.nodeType === Node.ELEMENT_NODE) { const el = node; if (el.getAttribute('contenteditable') == 'false') { return el; } } node = node.parentNode; } } function beforeCursor() { const s = getSelection(); const r0 = s.getRangeAt(0); const r = document.createRange(); r.selectNodeContents(editor); r.setEnd(r0.startContainer, r0.startOffset); return r.toString(); } function afterCursor() { const s = getSelection(); const r0 = s.getRangeAt(0); const r = document.createRange(); r.selectNodeContents(editor); r.setStart(r0.endContainer, r0.endOffset); return r.toString(); } function handleNewLine(event) { if (event.key === 'Enter') { const before = beforeCursor(); const after = afterCursor(); let [padding] = findPadding(before); let newLinePadding = padding; // If last symbol is "{" ident new line if (options.indentOn.test(before)) { newLinePadding += options.tab; } // Preserve padding if (newLinePadding.length > 0) { preventDefault(event); event.stopPropagation(); insert('\n' + newLinePadding); } else { legacyNewLineFix(event); } // Place adjacent "}" on next line if (newLinePadding !== padding && options.moveToNewLine.test(after)) { const pos = save(); insert('\n' + padding); restore(pos); } } } function legacyNewLineFix(event) { // Firefox does not support plaintext-only mode // and puts

on Enter. Let's help. if (isLegacy && event.key === 'Enter') { preventDefault(event); event.stopPropagation(); if (afterCursor() == '') { insert('\n '); const pos = save(); pos.start = --pos.end; restore(pos); } else { insert('\n'); } } } function handleSelfClosingCharacters(event) { const open = `([{'"`; const close = `)]}'"`; if (open.includes(event.key)) { preventDefault(event); const pos = save(); const wrapText = pos.start == pos.end ? '' : getSelection().toString(); const text = event.key + wrapText + close[open.indexOf(event.key)]; insert(text); pos.start++; pos.end++; restore(pos); } } function handleTabCharacters(event) { if (event.key === 'Tab') { preventDefault(event); if (event.shiftKey) { const before = beforeCursor(); let [padding, start] = findPadding(before); if (padding.length > 0) { const pos = save(); // Remove full length tab or just remaining padding const len = Math.min(options.tab.length, padding.length); restore({ start, end: start + len }); document.execCommand('delete'); pos.start -= len; pos.end -= len; restore(pos); } } else { insert(options.tab); } } } function handleUndoRedo(event) { if (isUndo(event)) { preventDefault(event); at--; const record = history[at]; if (record) { editor.innerHTML = record.html; restore(record.pos); } if (at < 0) at = 0; } if (isRedo(event)) { preventDefault(event); at++; const record = history[at]; if (record) { editor.innerHTML = record.html; restore(record.pos); } if (at >= history.length) at--; } } function recordHistory() { if (!focus) return; const html = editor.innerHTML; const pos = save(); const lastRecord = history[at]; if (lastRecord) { if (lastRecord.html === html && lastRecord.pos.start === pos.start && lastRecord.pos.end === pos.end) return; } at++; history[at] = { html, pos }; history.splice(at + 1); const maxHistory = 300; if (at > maxHistory) { at = maxHistory; history.splice(0, 1); } } function handlePaste(event) { if (event.defaultPrevented) return; preventDefault(event); const originalEvent = event.originalEvent ?? event; const text = originalEvent.clipboardData.getData('text/plain').replace(/\r\n?/g, '\n'); const pos = save(); insert(text); doHighlight(editor); restore({ start: Math.min(pos.start, pos.end) + text.length, end: Math.min(pos.start, pos.end) + text.length, dir: '<-', }); } function handleCut(event) { const pos = save(); const selection = getSelection(); const originalEvent = event.originalEvent ?? event; originalEvent.clipboardData.setData('text/plain', selection.toString()); document.execCommand('delete'); doHighlight(editor); restore({ start: Math.min(pos.start, pos.end), end: Math.min(pos.start, pos.end), dir: '<-', }); preventDefault(event); } function visit(editor, visitor) { const queue = []; if (editor.firstChild) queue.push(editor.firstChild); let el = queue.pop(); while (el) { if (visitor(el) === 'stop') break; if (el.nextSibling) queue.push(el.nextSibling); if (el.firstChild) queue.push(el.firstChild); el = queue.pop(); } } function isCtrl(event) { return event.metaKey || event.ctrlKey; } function isUndo(event) { return isCtrl(event) && !event.shiftKey && getKeyCode(event) === 'Z'; } function isRedo(event) { return isCtrl(event) && event.shiftKey && getKeyCode(event) === 'Z'; } function isCopy(event) { return isCtrl(event) && getKeyCode(event) === 'C'; } function getKeyCode(event) { let key = event.key || event.keyCode || event.which; if (!key) return undefined; return (typeof key === 'string' ? key : String.fromCharCode(key)).toUpperCase(); } function insert(text) { text = text .replace(/&/g, '&') .replace(//g, '>') .replace(/"/g, '"') .replace(/'/g, '''); document.execCommand('insertHTML', false, text); } function debounce(cb, wait) { let timeout = 0; return (...args) => { clearTimeout(timeout); timeout = window.setTimeout(() => cb(...args), wait); }; } function findPadding(text) { // Find beginning of previous line. let i = text.length - 1; while (i >= 0 && text[i] !== '\n') i--; i++; // Find padding of the line. let j = i; while (j < text.length && /[ \t]/.test(text[j])) j++; return [text.substring(i, j) || '', i, j]; } function toString() { return editor.textContent || ''; } function preventDefault(event) { event.preventDefault(); } function getSelection() { if (editor.parentNode?.nodeType == Node.DOCUMENT_FRAGMENT_NODE) { return editor.parentNode.getSelection(); } return window.getSelection(); } return { updateOptions(newOptions) { Object.assign(options, newOptions); }, updateCode(code) { editor.textContent = code; doHighlight(editor); onUpdate(code); }, onUpdate(callback) { onUpdate = callback; }, toString, save, restore, recordHistory, destroy() { for (let [type, fn] of listeners) { editor.removeEventListener(type, fn); } }, }; }