release: v0.1.2 — readOnly, new syntax, plugins, optimizations

Features:
- feat(core): readOnly mode with config option and setReadOnly() API
- feat(parser): superscript ^text^ and subscript ~text~ support
- feat(parser): highlight/mark ==text== syntax
- feat(parser): table column alignment with colons (:---, :---:, ---:)
- feat(parser): emoji shortcodes 😄 → 😊 (80+ common emojis)
- feat(plugins): imagePaste preset — paste clipboard images as base64
- feat(core): instance-level beforeRender/afterRender events
- feat(styles): print stylesheet (@media print)
- feat(styles): mark element CSS styling
- feat(styles): readOnly mode CSS (.me-readonly)

Optimizations:
- perf(core): history debounce now configurable via historyDebounce option
- perf(core): skip _render() in edit-only mode (already guarded)
- fix(core): divider drag division-by-zero guard
- fix(core): config.style deep merge with DEFAULTS
- fix(core): scroll position preserved across mode switches

Tests:
- 9 new test cases: readOnly (3), parser syntax (6)
- Total: 418 tests passing (+9 from v0.1.1)

Chores:
- version bump 0.1.1 → 0.1.2
- TypeScript definitions updated for new APIs

src/parser.js

@@ -1,7 +1,7 @@
 /**
  * MetonaEditor Parser - 轻量 Markdown 解析器
  * @module parser
- * @version 0.1.1
+ * @version 0.1.2
  * @description 自研零依赖 Markdown 解析器，覆盖 CommonMark 子集 + GFM 扩展
  *
  * 支持语法：
@@ -28,6 +28,30 @@
 
 import { escapeHTML } from './utils.js';
 
+/**
+ * 常用 Emoji 短码映射（子集）
+ */
+const EMOJI_MAP = {
+  smile: '😊', grinning: '😀', joy: '😂', rofl: '🤣', wink: '😉',
+  heart: '❤️', heart_eyes: '😍', star: '⭐', fire: '🔥', rocket: '🚀',
+  thumbsup: '👍', thumbsdown: '👎', clap: '👏', pray: '🙏', muscle: '💪',
+  ok: '👌', point_up: '👆', point_down: '👇', point_left: '👈', point_right: '👉',
+  check: '✅', cross: '❌', warning: '⚠️', info: 'ℹ️', question: '❓',
+  bulb: '💡', book: '📖', memo: '📝', pin: '📌', link: '🔗',
+  lock: '🔒', unlock: '🔓', key: '🔑', hammer: '🔨', wrench: '🔧',
+  gear: '⚙️', tools: '🛠️', magnet: '🧲', zap: '⚡', cloud: '☁️',
+  sun: '☀️', moon: '🌙', rain: '🌧️', snow: '❄️', umbrella: '☂️',
+  coffee: '☕', pizza: '🍕', cake: '🎂', beer: '🍺', wine: '🍷',
+  tada: '🎉', gift: '🎁', crown: '👑', gem: '💎', ring: '💍',
+  eye: '👁️', ear: '👂', nose: '👃', tongue: '👅', lips: '👄',
+  brain: '🧠', speech: '💬', thought: '💭', anger: '💢', sweat: '💦',
+  one: '1️⃣', two: '2️⃣', three: '3️⃣', four: '4️⃣', five: '5️⃣',
+  arrow_up: '⬆️', arrow_down: '⬇️', arrow_left: '⬅️', arrow_right: '➡️',
+  copyright: '©️', registered: '®️', tm: '™️', x: '❌', o: '⭕',
+  hundred: '💯', boom: '💥', dash: '💨', hole: '🕳️', bomb: '💣',
+  email: '📧', phone: '📞', clock: '🕐', hourglass: '⏳', calendar: '📅',
+};
+
 /**
  * 危险协议过滤
  */
@@ -105,13 +129,14 @@ export const parseMarkdown = (md, env = {}) => {
     // 表格：当前行含 |，下一行是分隔行
     if (/\|/.test(line) && i + 1 < lines.length && isTableSeparator(lines[i + 1])) {
       const header = line;
+      const align = parseAlign(lines[i + 1]);
       i += 2;
       const rows = [];
       while (i < lines.length && /\|/.test(lines[i]) && !/^\s*$/.test(lines[i])) {
         rows.push(lines[i]);
         i++;
       }
-      tokens.push({ type: 'table', header, rows });
+      tokens.push({ type: 'table', header, rows, align });
       continue;
     }
 
@@ -170,6 +195,21 @@ const isTableSeparator = (line) => {
   return /^\s*\|?\s*:?-+:?\s*(\|\s*:?-+:?\s*)*\|?\s*$/.test(line) && /-/.test(line);
 };
 
+/**
+ * 解析表格分隔行中的对齐信息
+ */
+const parseAlign = (line) => {
+  const cells = line.replace(/^\s*\|?\s*|\s*\|?\s*$/g, '').split(/\s*\|\s*/);
+  return cells.map((c) => {
+    const l = /^:/.test(c);
+    const r = /:$/.test(c);
+    if (l && r) return 'center';
+    if (r) return 'right';
+    if (l) return 'left';
+    return 'left';
+  });
+};
+
 /**
  * 渲染单个块级 token
  */
@@ -233,12 +273,14 @@ const renderCode = (code, lang, env) => {
 const renderTable = (tok, env) => {
   const splitRow = (r) => r.replace(/^\s*\|?\s*|\s*\|?\s*$/g, '').split(/\s*\|\s*/);
   const headers = splitRow(tok.header);
+  const align = tok.align || [];
+  const alignStyle = (i) => align[i] ? ` style="text-align:${align[i]}"` : '';
   let html = '<div class="me-table-wrap"><table><thead><tr>';
-  html += headers.map((h) => `<th>${renderInline(h, env)}</th>`).join('');
+  html += headers.map((h, i) => `<th${alignStyle(i)}>${renderInline(h, env)}</th>`).join('');
   html += '</tr></thead><tbody>';
   html += tok.rows.map((r) => {
     const cells = splitRow(r);
-    return `<tr>${cells.map((c) => `<td>${renderInline(c, env)}</td>`).join('')}</tr>`;
+    return `<tr>${cells.map((c, i) => `<td${alignStyle(i)}>${renderInline(c, env)}</td>`).join('')}</tr>`;
   }).join('');
   html += '</tbody></table></div>';
   return html;
@@ -297,9 +339,21 @@ const renderInline = (text, env) => {
   // 8. 删除线 ~~text~~（非贪婪匹配，支持内含单个 ~ 字符）
   s = s.replace(/~~(.+?)~~/g, '<del>$1</del>');
 
+  // 8b. 高亮标记 ==text==
+  s = s.replace(/==(.+?)==/g, '<mark>$1</mark>');
+
+  // 8c. 上标 ^text^（排除空白和首尾脱字符）
+  s = s.replace(/\^([^\s^].*?[^\s^]|[^\s^])\^/g, '<sup>$1</sup>');
+
+  // 8d. 下标 ~text~（排除空白和首尾波浪线）
+  s = s.replace(/~([^\s~].*?[^\s~]|[^\s~])~/g, '<sub>$1</sub>');
+
   // 9. 还原行内代码
   s = s.replace(/\u0000(\d+)\u0000/g, (m, idx) => `<code>${escapeHTML(codes[+idx])}</code>`);
 
+  // 9b. Emoji 短码 :name:
+  s = s.replace(/:(\w+):/g, (m, name) => EMOJI_MAP[name] || m);
+
   // 10. 软换行
   s = s.replace(/\n/g, '<br/>');