am 10af4b6e: Merge "Separate StringUtils.capitalizeFirstCharacter"

* commit '10af4b6e45689cba9bdc8c22f1bb76bf8bd2516b':
  Separate StringUtils.capitalizeFirstCharacter

java/src/com/android/inputmethod/keyboard/MainKeyboardView.java

@@ -1460,7 +1460,7 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
             return "";
         }
         final Locale locale = SubtypeLocale.getSubtypeLocale(subtype);
-        return StringUtils.toTitleCase(locale.getLanguage(), locale);
+        return StringUtils.capitalizeFirstCharacter(locale.getLanguage(), locale);
     }
 
     // Get InputMethodSubtype's middle display name in its locale.

java/src/com/android/inputmethod/latin/StringUtils.java

@@ -106,10 +106,18 @@ public final class StringUtils {
         }
     }
 
+    public static String capitalizeFirstCharacter(final String s, final Locale locale) {
+        if (s.length() <= 1) {
+            return s.toUpperCase(locale);
+        }
+        // Please refer to the comment below in {@link #toTitleCase(String,Locale)}.
+        final int cutoff = s.offsetByCodePoints(0, 1);
+        return s.substring(0, cutoff).toUpperCase(locale) + s.substring(cutoff);
+    }
+
     public static String toTitleCase(final String s, final Locale locale) {
         if (s.length() <= 1) {
-            // TODO: is this really correct? Shouldn't this be s.toUpperCase()?
-            return s;
+            return s.toUpperCase(locale);
         }
         // TODO: fix the bugs below
         // - This does not work for Greek, because it returns upper case instead of title case.

java/src/com/android/inputmethod/latin/SubtypeLocale.java

@@ -183,7 +183,7 @@ public final class SubtypeLocale {
             final Locale locale = LocaleUtils.constructLocaleFromString(localeString);
             displayName = locale.getDisplayName(displayLocale);
         }
-        return StringUtils.toTitleCase(displayName, displayLocale);
+        return StringUtils.capitalizeFirstCharacter(displayName, displayLocale);
     }
 
     // InputMethodSubtype's display name in its locale.
@@ -243,7 +243,7 @@ public final class SubtypeLocale {
                 }
             }
         };
-        return StringUtils.toTitleCase(
+        return StringUtils.capitalizeFirstCharacter(
                 getSubtypeName.runInLocale(sResources, displayLocale), displayLocale);
     }
 

tests/src/com/android/inputmethod/keyboard/SpacebarTextTests.java

@@ -113,7 +113,8 @@ public class SpacebarTextTests extends AndroidTestCase {
             final String subtypeName = SubtypeLocale.getSubtypeDisplayName(subtype);
             final Locale locale = SubtypeLocale.getSubtypeLocale(subtype);
             final String spacebarText = MainKeyboardView.getShortDisplayName(subtype);
-            final String languageCode = StringUtils.toTitleCase(locale.getLanguage(), locale);
+            final String languageCode = StringUtils.capitalizeFirstCharacter(
+                    locale.getLanguage(), locale);
             if (SubtypeLocale.isNoLanguage(subtype)) {
                 assertEquals(subtypeName, "", spacebarText);
             } else {

tests/src/com/android/inputmethod/latin/StringUtilsTests.java

@@ -106,9 +106,7 @@ public class StringUtilsTests extends AndroidTestCase {
                 StringUtils.toTitleCase("iab", new Locale("tr")));
         assertEquals("Aib",
                 StringUtils.toTitleCase("AİB", new Locale("tr")));
-        // For one character, toTitleCase returns the string as is. Not sure what the motivation
-        // is, but that's how it works now.
-        assertEquals("a",
+        assertEquals("A",
                 StringUtils.toTitleCase("a", Locale.ENGLISH));
         assertEquals("A",
                 StringUtils.toTitleCase("A", Locale.ENGLISH));