[SD2] Add support for a new tag Feature in KeyboardLayoutSet

Bug: 15840116
Change-Id: I3abbe4ce1ae573e9c5f1a8a96dc0056e8889d507

java/res/values/attrs.xml

@@ -488,6 +488,17 @@
         <attr name="enableProximityCharsCorrection" format="boolean" />
     </declare-styleable>
 
+    <declare-styleable name="KeyboardLayoutSet_Feature">
+        <!-- This should be aligned with ScriptUtils.SCRIPT_* -->
+        <attr name="supportedScript" format="enum">
+            <enum name="latin" value="0" />
+            <enum name="cyrillic" value="1" />
+            <enum name="greek" value="2" />
+            <enum name="arabic" value="3" />
+            <enum name="hebrew" value="4" />
+        </attr>
+    </declare-styleable>
+
     <declare-styleable name="SeekBarDialogPreference">
         <attr name="maxValue" format="integer" />
         <attr name="minValue" format="integer" />

java/res/xml/keyboard_layout_set_arabic.xml

@@ -20,6 +20,8 @@
 
 <KeyboardLayoutSet
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin">
+    <Feature
+        latin:supportedScript="arabic" />
     <Element
         latin:elementName="alphabet"
         latin:elementKeyboard="@xml/kbd_arabic"

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

@@ -40,6 +40,7 @@ import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.SubtypeSwitcher;
 import com.android.inputmethod.latin.utils.InputTypeUtils;
+import com.android.inputmethod.latin.utils.ScriptUtils;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
 import com.android.inputmethod.latin.utils.XmlParseUtils;
 
@@ -63,6 +64,7 @@ public final class KeyboardLayoutSet {
 
     private static final String TAG_KEYBOARD_SET = "KeyboardLayoutSet";
     private static final String TAG_ELEMENT = "Element";
+    private static final String TAG_FEATURE = "Feature";
 
     private static final String KEYBOARD_LAYOUT_SET_RESOURCE_PREFIX = "keyboard_layout_set_";
 
@@ -111,6 +113,7 @@ public final class KeyboardLayoutSet {
         boolean mIsSpellChecker;
         int mKeyboardWidth;
         int mKeyboardHeight;
+        int mScriptId;
         // Sparse array of KeyboardLayoutSet element parameters indexed by element's id.
         final SparseArray<ElementParams> mKeyboardLayoutSetElementIdToParamsMap =
                 new SparseArray<>();
@@ -275,6 +278,10 @@ public final class KeyboardLayoutSet {
             mParams.mDisableTouchPositionCorrectionDataForTest = true;
         }
 
+        public void setScriptId(final int scriptId) {
+            mParams.mScriptId = scriptId;
+        }
+
         public KeyboardLayoutSet build() {
             if (mParams.mSubtype == null)
                 throw new RuntimeException("KeyboardLayoutSet subtype is not specified");
@@ -320,6 +327,8 @@ public final class KeyboardLayoutSet {
                     final String tag = parser.getName();
                     if (TAG_ELEMENT.equals(tag)) {
                         parseKeyboardLayoutSetElement(parser);
+                    } else if (TAG_FEATURE.equals(tag)) {
+                        parseKeyboardLayoutSetFeature(parser);
                     } else {
                         throw new XmlParseUtils.IllegalStartTag(parser, tag, TAG_KEYBOARD_SET);
                     }
@@ -361,6 +370,21 @@ public final class KeyboardLayoutSet {
             }
         }
 
+        private void parseKeyboardLayoutSetFeature(final XmlPullParser parser)
+                throws XmlPullParserException, IOException {
+            final TypedArray a = mResources.obtainAttributes(Xml.asAttributeSet(parser),
+                    R.styleable.KeyboardLayoutSet_Feature);
+            try {
+                final int scriptId = a.getInt(
+                        R.styleable.KeyboardLayoutSet_Feature_supportedScript,
+                        ScriptUtils.SCRIPT_LATIN);
+                XmlParseUtils.checkEndTag(TAG_FEATURE, parser);
+                setScriptId(scriptId);
+            } finally {
+                a.recycle();
+            }
+        }
+
         private static int getKeyboardMode(final EditorInfo editorInfo) {
             final int inputType = editorInfo.inputType;
             final int variation = inputType & InputType.TYPE_MASK_VARIATION;

java/src/com/android/inputmethod/latin/utils/ScriptUtils.java

@@ -23,9 +23,12 @@ import java.util.TreeMap;
  * A class to help with handling different writing scripts.
  */
 public class ScriptUtils {
+    // TODO: should we use ISO 15924 identifiers instead?
     public static final int SCRIPT_LATIN = 0;
     public static final int SCRIPT_CYRILLIC = 1;
     public static final int SCRIPT_GREEK = 2;
+    public static final int SCRIPT_ARABIC = 3;
+    public static final int SCRIPT_HEBREW = 4;
     public static final TreeMap<String, Integer> mLanguageToScript;
     static {
         // List of the supported languages and their associated script. We won't check