fix(editor): preserve literals during SQL case conversion

apps/desktop/src/lib/sql/sqlSelectionCase.ts

@@ -0,0 +1,37 @@
+import { tokenizeSqlSemantic } from "@/lib/sql/semantic/tokens";
+
+export type SqlSelectionCaseMode = "upper" | "lower";
+
+type SqlSelectionRange = {
+  from: number;
+  to: number;
+};
+
+function convertCase(text: string, mode: SqlSelectionCaseMode): string {
+  return mode === "upper" ? text.toUpperCase() : text.toLowerCase();
+}
+
+export function convertSqlSelectionCase(sql: string, range: SqlSelectionRange, mode: SqlSelectionCaseMode, dialectId?: "mysql" | "postgres" | "sqlserver"): string {
+  const from = Math.max(0, Math.min(range.from, sql.length));
+  const to = Math.max(from, Math.min(range.to, sql.length));
+  const protectedTokens = tokenizeSqlSemantic(sql, dialectId).filter((item) => {
+    if (item.span.end <= from || item.span.start >= to) return false;
+    if (item.kind === "string") return true;
+    if (dialectId !== "mysql") return false;
+    if (item.kind === "quoted_identifier" && item.quote === '"') return true;
+    return item.kind === "comment" && /^\/\*(?:!|M!)/i.test(item.text);
+  });
+  if (protectedTokens.length === 0) return convertCase(sql.slice(from, to), mode);
+
+  let converted = "";
+  let cursor = from;
+  for (const item of protectedTokens) {
+    const literalFrom = Math.max(from, item.span.start);
+    const literalTo = Math.min(to, item.span.end);
+    converted += convertCase(sql.slice(cursor, literalFrom), mode);
+    converted += sql.slice(literalFrom, literalTo);
+    cursor = literalTo;
+  }
+  converted += convertCase(sql.slice(cursor, to), mode);
+  return converted;
+}