remove SUB_EXPRESSION

Author: rbri

src/main/java/com/gargoylesoftware/css/dom/CSSValueImpl.java

@@ -384,7 +384,6 @@ public CSSPrimitiveValueType getPrimitiveType() {
     //            case RECT_FUNCTION:
     //                return CSSPrimitiveValueType.CSS_RECT;
                 case UNICODERANGE:
-                case SUB_EXPRESSION:
                 case FUNCTION:
                 case FUNCTION_CALC:
                     return CSSPrimitiveValueType.CSS_STRING;

src/main/java/com/gargoylesoftware/css/parser/LexicalUnit.java

@@ -123,8 +123,6 @@ enum LexicalUnitType {
         RECT_FUNCTION,
         /** UNICODERANGE. */
         UNICODERANGE,
-        /** SUB_EXPRESSION. */
-        SUB_EXPRESSION,
         /** FUNCTION. */
         FUNCTION,
         /** FUNCTION_CALC. */

src/main/java/com/gargoylesoftware/css/parser/LexicalUnitImpl.java

@@ -438,12 +438,6 @@ public String getCssText() {
                     sb.append(range);
                 }
                 break;
-            case SUB_EXPRESSION:
-                final String subExpression = getStringValue();
-                if (null != subExpression) {
-                    sb.append(subExpression);
-                }
-                break;
             case FUNCTION:
             case FUNCTION_CALC:
                 final String functName = getFunctionName();
@@ -721,11 +715,6 @@ public String toDebugString() {
                     .append(getStringValue())
                     .append(")");
                 break;
-            case SUB_EXPRESSION:
-                sb.append("SUB_EXPRESSION(")
-                    .append(getStringValue())
-                    .append(")");
-                break;
             case FUNCTION:
             case FUNCTION_CALC:
                 sb.append("FUNCTION(")

src/test/java/com/gargoylesoftware/css/parser/LexicalUnitImplTest.java

@@ -256,13 +256,6 @@ public void refreshToStringCache() throws Exception {
 
         unit.setParameters(LexicalUnitImpl.createPixel(null, 4));
         assertEquals("pow(4px)", unit.toString());
-
-        unit = new LexicalUnitImpl(null, LexicalUnitType.SUB_EXPRESSION);
-        assertEquals("", unit.toString());
-        unit.setStringValue("value");
-
-        assertEquals("value", unit.toString());
-        assertEquals("SUB_EXPRESSION(value)", unit.toDebugString());
     }
 
     /**