From d7aa275894ce878d5d8b62acd3deba608e8a5b75 Mon Sep 17 00:00:00 2001
From: Zufu Liu <unknown>
Date: Sun, 1 Dec 2024 09:15:15 +1100
Subject: Feature [feature-requests:#1535]. Improve performance of DBCS brace
 matching.

---
 src/Document.cxx | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/Document.cxx b/src/Document.cxx
index a601d48ce..41a1c3414 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -2854,29 +2854,23 @@ Sci::Position Document::BraceMatch(Sci::Position position, Sci::Position /*maxRe
 	int depth = 1;
 	position = useStartPos ? startPos : NextPosition(position, direction);
 
-	// Avoid complex NextPosition call for bytes that may not cause incorrect match
+	// Avoid using MovePositionOutsideChar to check DBCS trail byte
 	unsigned char maxSafeChar = 0xff;
 	if (dbcsCodePage != 0 && dbcsCodePage != CpUtf8) {
-		maxSafeChar = (direction >= 0) ? 0x80 : DBCSMinTrailByte() - 1;
+		maxSafeChar = DBCSMinTrailByte() - 1;
 	}
 
 	while ((position >= 0) && (position < LengthNoExcept())) {
 		const unsigned char chAtPos = CharAt(position);
 		if (chAtPos == chBrace || chAtPos == chSeek) {
-			if ((position > GetEndStyled()) || (StyleIndexAt(position) == styBrace)) {
+			if (((position > GetEndStyled()) || (StyleIndexAt(position) == styBrace)) &&
+				(chAtPos <= maxSafeChar || position == MovePositionOutsideChar(position, direction, false))) {
 				depth += (chAtPos == chBrace) ? 1 : -1;
 				if (depth == 0)
 					return position;
 			}
 		}
-		if (chAtPos <= maxSafeChar) {
-			position += direction;
-		} else {
-			const Sci::Position positionBeforeMove = position;
-			position = NextPosition(position, direction);
-			if (position == positionBeforeMove)
-				break;
-		}
+		position += direction;
 	}
 	return - 1;
 }
-- 
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