feat(chat): add local-first conversation workspace

2026-08-13 15:55:15 +08:00
parent d1d50d722c
commit 8991f78f9f
43 changed files with 5450 additions and 592 deletions
@@ -0,0 +1,41 @@
+const mathPattern = /(?<!\\)\$\$[\s\S]*?(?<!\\)\$\$|\\\[[\s\S]*?\\\]|\\\([^\n]*?\\\)|(?<![\\$])\$(?!\$)(?:\\.|[^\\$\n])+?(?<!\\)\$(?!\$)/g;
+const tokenPattern = /\uE000xiteng-math-(\d+)\uE001/g;
+
+function escapeHtml(value: string) {
+  return value.replace(/[&<>"']/g, (character) => ({
+    "&": "&amp;",
+    "<": "&lt;",
+    ">": "&gt;",
+    '"': "&quot;",
+    "'": "&#39;"
+  })[character]!);
+}
+
+export function protectMath(value: string) {
+  const fragments: string[] = [];
+  const source = value.replace(mathPattern, (fragment) => {
+    const index = fragments.push(fragment) - 1;
+    return `\uE000xiteng-math-${index}\uE001`;
+  });
+  return {source, fragments};
+}
+
+function mathFragmentKey(fragment: string, index: number) {
+  let hash = 2166136261;
+  for (let offset = 0; offset < fragment.length; offset += 1) {
+    hash ^= fragment.charCodeAt(offset);
+    hash = Math.imul(hash, 16777619);
+  }
+  return `${index}-${fragment.length}-${(hash >>> 0).toString(36)}`;
+}
+
+export function restoreMath(value: string, fragments: string[]) {
+  return value.replace(tokenPattern, (_token, rawIndex: string, offset: number) => {
+    const index = Number(rawIndex);
+    const fragment = fragments[index] || "";
+    const codeStart = value.lastIndexOf("<code", offset);
+    const codeEnd = value.lastIndexOf("</code>", offset);
+    if (codeStart > codeEnd) return escapeHtml(fragment);
+    return `<span class="math-fragment" data-math-key="${mathFragmentKey(fragment, index)}">${escapeHtml(fragment)}</span>`;
+  });
+}