classlib: implement String.to__Case with locale parameter in JS BE (#766)

classlib/src/main/java/org/teavm/classlib/impl/string/JSStringInjector.java

@@ -195,15 +195,39 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
     }
 
     private void toLowerCaseJS(InjectorContext context) {
-        var writer = context.getWriter();
+        if (context.argumentCount() == 1) {
-        context.writeExpr(context.getArgument(0));
+            var writer = context.getWriter();
-        writer.append(".toLowerCase()");
+            context.writeExpr(context.getArgument(0));
+            writer.append(".toLowerCase()");
+            return;
+        }
+        if (context.argumentCount() == 2) {
+            var writer = context.getWriter();
+            context.writeExpr(context.getArgument(0));
+            writer.append(".toLocaleLowerCase(");
+            context.writeExpr(context.getArgument(1));
+            writer.append(")");
+            return;
+        }
+        throw new IllegalArgumentException();
     }
 
     private void toUpperCaseJS(InjectorContext context) {
-        var writer = context.getWriter();
+        if (context.argumentCount() == 1) {
-        context.writeExpr(context.getArgument(0));
+            var writer = context.getWriter();
-        writer.append(".toUpperCase()");
+            context.writeExpr(context.getArgument(0));
+            writer.append(".toUpperCase()");
+            return;
+        }
+        if (context.argumentCount() == 2) {
+            var writer = context.getWriter();
+            context.writeExpr(context.getArgument(0));
+            writer.append(".toLocaleUpperCase(");
+            context.writeExpr(context.getArgument(1));
+            writer.append(")");
+            return;
+        }
+        throw new IllegalArgumentException();
     }
 
     private void intern(InjectorContext context) {

classlib/src/main/java/org/teavm/classlib/java/lang/TString.java

@@ -740,6 +740,9 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     @NoSideEffects
     private static native Object toLowerCaseJS(Object nativeString);
 
+    @NoSideEffects
+    private static native Object toLowerCaseJS(Object nativeString, Object languageTag);
+
     private TString toLowerCaseChars() {
         var chars = new char[charactersLength()];
         for (int i = 0; i < charactersLength(); ++i) {
@@ -766,6 +769,10 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     }
 
     public TString toLowerCase(TLocale locale) {
+        if (PlatformDetector.isJavaScript()) {
+            var upperCase = toLowerCaseJS(nativeString(), locale.toLanguageTag().nativeString());
+            return upperCase != nativeString() ? new TString(upperCase) : this;
+        }
         return toLowerCase();
     }
 
@@ -800,6 +807,9 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     @NoSideEffects
     private static native Object toUpperCaseJS(Object nativeString);
 
+    @NoSideEffects
+    private static native Object toUpperCaseJS(Object nativeString, Object languageTag);
+
     private TString toUpperCaseChars() {
         var chars = new char[charactersLength()];
         for (int i = 0; i < charactersLength(); ++i) {
@@ -825,6 +835,10 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     }
 
     public TString toUpperCase(TLocale locale) {
+        if (PlatformDetector.isJavaScript()) {
+            var upperCase = toUpperCaseJS(nativeString(), locale.toLanguageTag().nativeString());
+            return upperCase != nativeString() ? new TString(upperCase) : this;
+        }
         return toUpperCase();
     }
 

classlib/src/main/java/org/teavm/classlib/java/util/TLocale.java

@@ -36,6 +36,7 @@ import java.util.Arrays;
 import org.teavm.classlib.impl.unicode.CLDRHelper;
 import org.teavm.classlib.java.io.TSerializable;
 import org.teavm.classlib.java.lang.TCloneable;
+import org.teavm.classlib.java.lang.TString;
 import org.teavm.platform.metadata.ResourceArray;
 import org.teavm.platform.metadata.ResourceMap;
 import org.teavm.platform.metadata.StringResource;
@@ -88,7 +89,7 @@ public final class TLocale implements TCloneable, TSerializable {
         if (language == null || country == null || variant == null) {
             throw new NullPointerException();
         }
-        if (language.length() == 0 && country.length() == 0) {
+        if (language.isEmpty() && country.isEmpty()) {
             languageCode = "";
             countryCode = "";
             variantCode = variant;
@@ -200,18 +201,18 @@ public final class TLocale implements TCloneable, TSerializable {
     public String getDisplayName(TLocale locale) {
         int count = 0;
         StringBuilder buffer = new StringBuilder();
-        if (languageCode.length() > 0) {
+        if (!languageCode.isEmpty()) {
             buffer.append(getDisplayLanguage(locale));
             count++;
         }
-        if (countryCode.length() > 0) {
+        if (!countryCode.isEmpty()) {
             if (count == 1) {
                 buffer.append(" (");
             }
             buffer.append(getDisplayCountry(locale));
             count++;
         }
-        if (variantCode.length() > 0) {
+        if (!variantCode.isEmpty()) {
             if (count == 1) {
                 buffer.append(" (");
             } else if (count == 2) {
@@ -260,12 +261,12 @@ public final class TLocale implements TCloneable, TSerializable {
     public String toString() {
         StringBuilder result = new StringBuilder();
         result.append(languageCode);
-        if (countryCode.length() > 0) {
+        if (!countryCode.isEmpty()) {
             result.append('_');
             result.append(countryCode);
         }
-        if (variantCode.length() > 0 && result.length() > 0) {
+        if (!variantCode.isEmpty() && result.length() > 0) {
-            if (0 == countryCode.length()) {
+            if (countryCode.isEmpty()) {
                 result.append("__");
             } else {
                 result.append('_');
@@ -274,4 +275,18 @@ public final class TLocale implements TCloneable, TSerializable {
         }
         return result.toString();
     }
+
+    public TString toLanguageTag() {
+        StringBuilder result = new StringBuilder();
+        result.append(languageCode);
+        if (!countryCode.isEmpty()) {
+            result.append('-');
+            result.append(countryCode);
+        }
+        if (!variantCode.isEmpty() && result.length() > 0) {
+            result.append('-');
+            result.append(variantCode);
+        }
+        return new TString(result.toString().toCharArray());
+    }
 }

tests/src/test/java/org/teavm/classlib/java/lang/StringTest.java

@@ -22,6 +22,7 @@ import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import java.io.UnsupportedEncodingException;
+import java.util.Locale;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.teavm.junit.EachTestCompiledSeparately;
@@ -309,8 +310,24 @@ public class StringTest {
     }
 
     @Test
-    public void makesLowerCase() {
+    public void convertsCase() {
         assertEquals("foo bar", "FoO bAr".toLowerCase());
+        assertEquals("FOO BAR", "FoO bAr".toUpperCase());
+    }
+
+    private String common = "i̇stanbul";
+    private String turkish = "istanbul";
+
+    @Test
+    @SkipPlatform({ TestPlatform.C, TestPlatform.WEBASSEMBLY, TestPlatform.WASI })
+    public void convertsCaseLocaled() {
+        assertEquals(turkish, "İstanbul".toLowerCase(new Locale("tr", "TR")));
+        assertEquals(common, "İstanbul".toLowerCase(Locale.US));
+        assertNotEquals(turkish, common);
+        assertEquals("İSTANBUL", common.toUpperCase(Locale.US));
+        assertEquals("İSTANBUL", turkish.toUpperCase(new Locale("tr", "TR")));
+        assertNotEquals(common.toUpperCase(Locale.US), turkish.toUpperCase(new Locale("tr", "TR")));
+        assertEquals(common.toUpperCase(Locale.US), common.toUpperCase(Locale.CANADA));
     }
 
     @Test

tests/src/test/java/org/teavm/classlib/java/util/LocaleTest.java

@@ -61,4 +61,14 @@ public class LocaleTest {
         assertEquals("Соединенные Штаты", usEnglish.getDisplayCountry(russian));
         assertEquals("Россия", russian.getDisplayCountry(russian));
     }
+
+    @Test
+    public void testLanguageTag() {
+        assertEquals("fr-CA", Locale.CANADA_FRENCH.toLanguageTag());
+        assertEquals("zh", Locale.CHINESE.toLanguageTag());
+        assertEquals("zh-TW", Locale.TRADITIONAL_CHINESE.toLanguageTag());
+        assertEquals("zh-CN", Locale.SIMPLIFIED_CHINESE.toLanguageTag());
+        assertEquals("en-GB", Locale.UK.toLanguageTag());
+        assertEquals("en-US", Locale.US.toLanguageTag());
+    }
 }