Align tts:textCombine permitted values with TTML (#179)

Author: palemieux

src/main/js/html.js

@@ -383,7 +383,7 @@
             }
 
             if (imscStyles.byName.textCombine.qname in isd_element.styleAttrs &&
-                    isd_element.styleAttrs[imscStyles.byName.textCombine.qname][0] === "all") {
+                    isd_element.styleAttrs[imscStyles.byName.textCombine.qname] === "all") {
 
                 /* ignore tate-chu-yoku since line break cannot happen within */
                 e.textContent = isd_element.text;
@@ -1600,7 +1600,7 @@
                 "http://www.w3.org/ns/ttml#styling textCombine",
                 function (context, dom_element, isd_element, attr) {
 
-                    dom_element.style.textCombineUpright = attr.join(" ");
+                    dom_element.style.textCombineUpright = attr;
 
                 }
         ),

src/main/js/styles.js

@@ -801,16 +801,9 @@
             true,
             true,
             function (str) {
-                var s = str.split(" ");
-
-                if (s.length === 1) {
-
-                    if (s[0] === "none" || s[0] === "all") {
-
-                        return [s[0]];
-
-                    }
+                if (str === "none" || str === "all") {
 
+                    return str;
                 }
 
                 return null;