add CSSValueExpression.js

Author: myhere

lib/parse.js

@@ -219,16 +219,29 @@ CSSOM.parse = function parse(token) {
 			break;
 
 		case '(':
-			if (state === 'value') {
-				index = token.indexOf(')', i + 1);
-				if (index === -1) {
-					parseError('Unmatched "("');
-				}
-				buffer += token.slice(i, index + 1);
-				i = index;
-			} else {
-				buffer += character;
-			}
+      if (state === 'value') {
+        // ie css expression mode
+        if (buffer.trim() == 'expression') {
+          var info = new CSSOM.CSSValueExpression(token, i).parse();
+
+          if (info.error) {
+            parseError(info.error);
+          } else {
+            buffer += info.expression;
+            i = info.idx;
+          }
+        } else {
+          index = token.indexOf(')', i + 1);
+          if (index === -1) {
+            parseError('Unmatched "("');
+          }
+          buffer += token.slice(i, index + 1);
+          i = index;
+        }
+      } else {
+        buffer += character;
+      }
+
 			break;
 
 		case "!":
@@ -341,4 +354,5 @@ CSSOM.CSSFontFaceRule = require("./CSSFontFaceRule").CSSFontFaceRule;
 CSSOM.CSSStyleDeclaration = require('./CSSStyleDeclaration').CSSStyleDeclaration;
 CSSOM.CSSKeyframeRule = require('./CSSKeyframeRule').CSSKeyframeRule;
 CSSOM.CSSKeyframesRule = require('./CSSKeyframesRule').CSSKeyframesRule;
+CSSOM.CSSValueExpression = require('./CSSValueExpression').CSSValueExpression;
 ///CommonJS