fix(mongodb): use line comments in editor

apps/desktop/src/lib/editor/shellLineCommentRanges.ts

@@ -0,0 +1,59 @@
+export interface ShellLineCommentRange {
+  from: number;
+  to: number;
+}
+
+/**
+ * Finds `//` line comments in shell-style text (the MongoDB editor keeps the SQL grammar for
+ * highlighting, so its comments are not tokenized by the parser). Quoted strings and block
+ * comments are skipped so markers such as `"https://host"` stay uncommented.
+ */
+export function shellLineCommentRanges(text: string, to = text.length): ShellLineCommentRange[] {
+  const ranges: ShellLineCommentRange[] = [];
+  const limit = Math.min(to, text.length);
+  let index = 0;
+
+  while (index < limit) {
+    const char = text[index];
+
+    if (char === '"' || char === "'" || char === "`") {
+      index = skipString(text, index, char);
+      continue;
+    }
+
+    if (char === "/" && text[index + 1] === "*") {
+      const end = text.indexOf("*/", index + 2);
+      index = end === -1 ? text.length : end + 2;
+      continue;
+    }
+
+    if (char === "/" && text[index + 1] === "/") {
+      let end = index + 2;
+      while (end < text.length && text[end] !== "\n" && text[end] !== "\r") end += 1;
+      ranges.push({ from: index, to: end });
+      index = end;
+      continue;
+    }
+
+    index += 1;
+  }
+
+  return ranges;
+}
+
+function skipString(text: string, start: number, quote: string): number {
+  let index = start + 1;
+  while (index < text.length) {
+    const char = text[index];
+    if (char === "\\") {
+      index += 2;
+      continue;
+    }
+    if (char === quote) return index + 1;
+    // Single- and double-quoted strings do not span lines; bail out so an unterminated quote
+    // does not swallow the rest of the document.
+    if ((quote === '"' || quote === "'") && (char === "\n" || char === "\r")) return index;
+    index += 1;
+  }
+  return index;
+}