quick check for ascii letter

DataDog · Dec 16, 2024 · 90812ab · 90812ab
1 parent 06a308b
commit 90812ab
Showing 1 changed file with 8 additions and 2 deletions.
diff --git a/sqllexer_utils.go b/sqllexer_utils.go
@@ -198,11 +198,17 @@ func isLeadingSign(ch rune) bool {
 }
 
 func isLetter(ch rune) bool {
-	return unicode.IsLetter(ch) || ch == '_'
+	// Fast path: ASCII letters and underscore
+	if ch <= 127 {
+		return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || ch == '_'
+	}
+	// Fallback to Unicode
+	return unicode.IsLetter(ch)
 }
 
 func isAlphaNumeric(ch rune) bool {
-	return isLetter(ch) || isDigit(ch)
+	// Check if it's a digit first, then letter (faster for numbers)
+	return isDigit(ch) || isLetter(ch)
 }
 
 func isDoubleQuote(ch rune) bool {