requireSpacesInCallExpression: use tokenAssert

Closes gh-983

Author: hzoo

lib/rules/require-spaces-in-call-expression.js

@@ -44,24 +44,14 @@ module.exports.prototype = {
         var tokens = file.getTokens();
 
         file.iterateNodesByType('CallExpression', function(node) {
-            var nodeBeforeRoundBrace = node;
-            if (node.callee) {
-                nodeBeforeRoundBrace = node.callee;
-            }
-
-            var roundBraceToken = file.getTokenByRangeStart(nodeBeforeRoundBrace.range[0]);
-            do {
-                roundBraceToken = file.findNextToken(roundBraceToken, 'Punctuator', '(');
-            } while (roundBraceToken.range[0] < nodeBeforeRoundBrace.range[1]);
-
-            var functionEndToken = file.getPrevToken(roundBraceToken);
-
-            if (roundBraceToken.value === '(' && functionEndToken.range[1] === roundBraceToken.range[0]) {
-                errors.add(
-                    'Missing space before opening round brace',
-                    roundBraceToken.loc.start
-                );
-            }
+            var lastCalleeToken = file.getLastNodeToken(node.callee);
+            var roundBraceToken = file.findNextToken(lastCalleeToken, 'Punctuator', '(');
+
+            errors.assert.whitespaceBetween({
+                token: file.getPrevToken(roundBraceToken),
+                nextToken: roundBraceToken,
+                message: 'Missing space before opening round brace'
+            });
         });
     }
 };