1 files changed, 8 insertions, 0 deletions
diff --git a/src/mbgl/text/tagged_string.cpp b/src/mbgl/text/tagged_string.cpp
index 8c4e3b02e8..e8a1c6f51f 100644
--- a/src/mbgl/text/tagged_string.cpp
+++ b/src/mbgl/text/tagged_string.cpp
@@ -8,6 +8,7 @@ void TaggedString::addSection(const std::u16string& sectionText, double scale, F
     styledText.first += sectionText;
     sections.emplace_back(scale, fontStack, std::move(textColor));
     styledText.second.resize(styledText.first.size(), sections.size() - 1);
+    supportsVerticalWritingMode = nullopt;
 }
 
 void TaggedString::trim() {
@@ -37,4 +38,11 @@ void TaggedString::verticalizePunctuation() {
     styledText.first = util::i18n::verticalizePunctuation(styledText.first);
 }
 
+bool TaggedString::allowsVerticalWritingMode() {
+    if (!supportsVerticalWritingMode) {
+        supportsVerticalWritingMode = util::i18n::allowsVerticalWritingMode(rawText());
+    }
+    return *supportsVerticalWritingMode;
+}
+
 } // namespace mbgl