fix(editor): support Unicode SQL completion prefixes

apps/desktop/src/lib/sql/semantic/completion.ts

@@ -183,7 +183,12 @@ export function sqlCompletionContextFromSemantic(model: SqlSemanticModel, base:
   }
 
   const scope = sqlSemanticCompletionScope(model);
-  const qualifier = model.cursorIntent.qualifierParts.length > 0 ? model.cursorIntent.qualifierParts.join(".") : undefined;
+  const contextKind = semanticContextKind(model);
+  const basePrefixHasNonAscii = Array.from(base.prefix).some((character) => (character.codePointAt(0) ?? 0) > 0x7f);
+  const useBaseTrailingIdentifier = basePrefixHasNonAscii && model.cursorIntent.prefix.length === 0 && model.cursorIntent.replacementRange.start === model.cursorIntent.replacementRange.end && base.contextKind === contextKind;
+  const prefix = useBaseTrailingIdentifier ? base.prefix : model.cursorIntent.prefix;
+  const qualifierParts = model.cursorIntent.qualifierParts.length > 0 ? [...model.cursorIntent.qualifierParts] : useBaseTrailingIdentifier ? base.qualifierParts : undefined;
+  const qualifier = qualifierParts?.join(".");
   const referencedTables = sqlSemanticReferencedTables(model);
   const mutationTarget = semanticMutationTarget(model);
   const mutationDatabase = mutationTarget?.metadataTarget?.database;
@@ -195,9 +200,9 @@ export function sqlCompletionContextFromSemantic(model: SqlSemanticModel, base:
 
   return {
     ...base,
-    prefix: model.cursorIntent.prefix,
+    prefix,
     qualifier,
-    qualifierParts: model.cursorIntent.qualifierParts.length > 0 ? [...model.cursorIntent.qualifierParts] : undefined,
+    qualifierParts,
     suggestTables,
     suggestColumns,
     suggestKeywords: scope.kind === "keyword" || (!suggestTables && !suggestColumns && !suggestRoutines),
@@ -215,6 +220,6 @@ export function sqlCompletionContextFromSemantic(model: SqlSemanticModel, base:
     updateTarget: model.cursorIntent.kind === "update_column" && mutationTarget ? { table: mutationTarget.name, schema: mutationSchema } : base.updateTarget,
     deleteTarget: model.cursorIntent.kind === "delete_target" && mutationTarget ? { table: mutationTarget.name, schema: mutationSchema } : base.deleteTarget,
     onStar: model.cursorIntent.kind === "star" || base.onStar,
-    contextKind: semanticContextKind(model),
+    contextKind,
   };
 }

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

@@ -1721,6 +1721,8 @@ function isCallRoutineContext(beforeToken: string): boolean {
   return /\bcall\s+(?:[A-Za-z_][\w$]*\.)?$/i.test(beforeToken) || /\bcall\s+(?:[A-Za-z_][\w$]*\.)?[A-Za-z_][\w$]*$/i.test(beforeToken);
 }
 
+const SQL_IDENTIFIER_START_CHAR = /[@_\p{ID_Start}]/u;
+const SQL_IDENTIFIER_SUFFIX = /[$@_\u200c\u200d\p{ID_Continue}]+$/u;
 const SQL_IDENTIFIER_CONTINUE_CHAR = /[$_\u200c\u200d\p{ID_Continue}]/u;
 
 function hasTableAliasAfterCursor(sql: string, cursor: number): boolean {
@@ -2022,13 +2024,12 @@ function parseTrailingIdentifierPart(input: string, endExclusive: number): { sta
     return null;
   }
 
-  let start = end;
-  while (start >= 0 && /[A-Za-z0-9_$@]/.test(input[start] ?? "")) start -= 1;
-  start += 1;
-  if (start >= endExclusive) return null;
-  const raw = input.slice(start, endExclusive);
-  if (!/^[@A-Za-z_][\w$@]*$/.test(raw)) return null;
-  return { start, raw };
+  const match = SQL_IDENTIFIER_SUFFIX.exec(input.slice(0, endExclusive));
+  if (!match) return null;
+  const raw = match[0];
+  const firstCodePoint = raw.codePointAt(0);
+  if (firstCodePoint === undefined || !SQL_IDENTIFIER_START_CHAR.test(String.fromCodePoint(firstCodePoint))) return null;
+  return { start: match.index, raw };
 }
 
 /**