prepare for image tags

Author: ylafon

org/w3c/css/values/CssImage.java

@@ -36,6 +36,7 @@ public final int getType() {
     static final CssIdent ellipse = CssIdent.getIdent("ellipse");
     static final CssIdent from = CssIdent.getIdent("from");
     static final CssIdent[] extent_keywords;
+    static final CssIdent[] image_tags;
 
     static {
         String _val[] = {"closest-corner", "closest-side",
@@ -45,6 +46,12 @@ public final int getType() {
         for (String s : _val) {
             extent_keywords[i++] = CssIdent.getIdent(s);
         }
+        String _img_tags[] = { "ltr", "rtl"};
+        image_tags = new CssIdent[_img_tags.length];
+        i = 0;
+        for (String s: _img_tags) {
+            image_tags[i++] = CssIdent.getIdent(s);
+        }
     }
 
     boolean contains_variable = false;
@@ -86,6 +93,15 @@ public static CssIdent getExtentIdent(CssIdent ident) {
         return null;
     }
 
+    public static CssIdent getImageTag(CssIdent ident)  {
+        for (CssIdent id : image_tags) {
+            if (id.equals(ident)) {
+                return id;
+            }
+        }
+        return null;
+    }
+
     public static CssIdent getShape(CssIdent ident) {
         if (circle.equals(ident)) {
             return circle;