first commit

20250916/ppt/js/engine.js

@@ -0,0 +1,32 @@
+function escapeHtml(str) {
+  if (str == null) return "";
+  return String(str)
+    .replace(/&/g, "&")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+export function renderTemplate(template, data = {}, opts = { allowRaw: true }) {
+  // 支持 nested keys (a.b.c)
+  const get = (path) =>
+    path
+      .split(".")
+      .reduce((acc, k) => (acc == null ? undefined : acc[k]), data);
+
+  return template.replace(
+    /\{\{\{\s*([\w$.]+)\s*\}\}\}|\{\{\s*([\w$.]+)\s*\}\}/g,
+    (m, rawKey, escKey) => {
+      const key = rawKey || escKey;
+      const val = get(key);
+      if (rawKey)
+        return opts.allowRaw
+          ? val == null
+            ? ""
+            : String(val)
+          : escapeHtml(val);
+      return val == null ? "" : escapeHtml(val);
+    }
+  );
+}