[core] Introduce LanguageTag for parsing BCP 47 tags

1 files changed, 45 insertions, 0 deletions

diff --git a/test/text/language_tag.test.cpp b/test/text/language_tag.test.cpp
new file mode 100644
index 0000000000..7d70088594
--- /dev/null
+++ b/test/text/language_tag.test.cpp
@@ -0,0 +1,45 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/text/language_tag.hpp>
+
+using namespace mbgl;
+
+TEST(LanguageTag, Parsing) {
+    LanguageTag bareLanguage = LanguageTag::fromBCP47("de");
+    EXPECT_EQ(*(bareLanguage.language), "de");
+    EXPECT_FALSE(bareLanguage.script);
+    EXPECT_FALSE(bareLanguage.region);
+    
+    LanguageTag languageAndScript = LanguageTag::fromBCP47("de-hans");
+    EXPECT_EQ(*(languageAndScript.language), "de");
+    EXPECT_EQ(*(languageAndScript.script), "hans");
+    EXPECT_FALSE(languageAndScript.region);
+    
+    LanguageTag languageAndRegion = LanguageTag::fromBCP47("de-US");
+    EXPECT_EQ(*(languageAndRegion.language), "de");
+    EXPECT_FALSE(languageAndRegion.script);
+    EXPECT_EQ(*(languageAndRegion.region), "US");
+    
+    LanguageTag kitchenSink = LanguageTag::fromBCP47("de-ext-two-Hans-US-variant-x-private");
+    EXPECT_EQ(*(kitchenSink.language), "de");
+    EXPECT_EQ(*(kitchenSink.script), "Hans");
+    EXPECT_EQ(*(kitchenSink.region), "US");
+}
+
+TEST(LanguageTag, Generation) {
+    LanguageTag deHansUS({"de"}, {"hans"}, {"US"});
+    EXPECT_EQ(deHansUS.toBCP47(), "de-hans-US");
+    
+    LanguageTag deUS({"de"}, {}, {"US"});
+    EXPECT_EQ(deUS.toBCP47(), "de-US");
+    
+    LanguageTag noLanguage({}, {"hans"}, {"US"});
+    EXPECT_EQ(noLanguage.toBCP47(), "");
+    
+    LanguageTag deHans({"de"}, {"hans"}, {});
+    EXPECT_EQ(deHans.toBCP47(), "de-hans");
+    
+    LanguageTag de({"de"}, {}, {});
+    EXPECT_EQ(de.toBCP47(), "de");
+}
+