perf(editor): cache executable statement ranges for large SQL scrolling

Co-authored-by: staff <staff@qimaos-MacBook-Pro.local>

apps/desktop/src/lib/executableStatementRangeCache.ts

@@ -0,0 +1,25 @@
+import type { Text } from "@codemirror/state";
+import type { DatabaseType } from "@/types/database";
+import { executableStatementRanges, type SqlTextRange } from "@/lib/sqlStatementRanges";
+
+export interface ExecutableStatementRangeCache {
+  doc: Text;
+  databaseType?: DatabaseType;
+  byStart: Map<number, SqlTextRange>;
+}
+
+export type ExecutableStatementRangeParser = (sql: string, databaseType?: DatabaseType) => SqlTextRange[];
+
+export function executableStatementRangeCacheForDoc(cache: ExecutableStatementRangeCache | null, doc: Text, databaseType?: DatabaseType, parse: ExecutableStatementRangeParser = executableStatementRanges): ExecutableStatementRangeCache {
+  if (cache?.doc === doc && cache.databaseType === databaseType) return cache;
+
+  const byStart = new Map<number, SqlTextRange>();
+  for (const range of parse(doc.toString(), databaseType)) {
+    byStart.set(range.from, range);
+  }
+  return { doc, databaseType, byStart };
+}
+
+export function executableStatementRangeStartingAt(cache: ExecutableStatementRangeCache, lineFrom: number): SqlTextRange | null {
+  return cache.byStart.get(lineFrom) ?? null;
+}