linux-kernel - [PATCH 7/7] kconfig: qconf: simplify character replacement

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Message-ID: <3592638.iIbC2pHGDl@devpool47.emlix.com>
Date: Wed, 23 Oct 2024 08:39:15 +0200
From: Rolf Eike Beer <eb@...ix.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] kconfig: qconf: simplify character replacement

Replace the hand crafted lookup table with a QHash. This has the nice benefit
that the added offsets can not get out of sync with the length of the
replacement strings.

Signed-off-by: Rolf Eike Beer <eb@...ix.com>
---
 scripts/kconfig/qconf.cc | 33 ++++++++++++---------------------
 1 file changed, 12 insertions(+), 21 deletions(-)

diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index 4b2f707c9203..f07a463c5760 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -1123,28 +1123,19 @@ QString ConfigInfoView::print_filter(const QString &str)
 {
 	QRegularExpression re("[<>&\"\\n]");
 	QString res = str;
+
+	QHash<QChar, QString> patterns;
+	patterns['<'] = "&lt;";
+	patterns['>'] = "&gt;";
+	patterns['&'] = "&amp;";
+	patterns['"'] = "&quot;";
+	patterns['\n'] = "<br>";
+
 	for (int i = 0; (i = res.indexOf(re, i)) >= 0;) {
-		switch (res[i].toLatin1()) {
-		case '<':
-			res.replace(i, 1, "&lt;");
-			i += 4;
-			break;
-		case '>':
-			res.replace(i, 1, "&gt;");
-			i += 4;
-			break;
-		case '&':
-			res.replace(i, 1, "&amp;");
-			i += 5;
-			break;
-		case '"':
-			res.replace(i, 1, "&quot;");
-			i += 6;
-			break;
-		case '\n':
-			res.replace(i, 1, "<br>");
-			i += 4;
-			break;
+		const QString n = patterns.value(res[i], QString());
+		if (!n.isEmpty()) {
+			res.replace(i, 1, n);
+			i += n.length();
 		}
 	}
 	return res;
-- 
2.47.0


-- 
Rolf Eike Beer

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