Fix issue #36, now accepting ' and ", formating functions can be passed

@sortablelink("id", trans('column-sortable.id'))
@sortablelink("name", "Name")
@sortablelink('email')
@sortablelink('detail.phone_number', trans('column-sortable.phone'))

README.md

@@ -109,8 +109,6 @@ There is one blade extension for you to use **@sortablelink**
 **Column** (1st) parameter is `order by` and **Title** (2nd) parameter is displayed inside anchor tags.
 You can omit **Title** parameter.
 
->**WARNING**: @sortablelink directive only accepts single quotes
-
 ## Config in few words
 
 Sortablelink blade extension distinguishes between "types" (numeric, amount and alpha) and applies different class for each of them. See following snippet:

src/ColumnSortable/ColumnSortableServiceProvider.php

@@ -32,7 +32,7 @@ public function boot()
         Blade::directive('sortablelink', function ($expression) {
             //TODO: only accepts single quotes 'Email', would be nice to accept double quotes as well.
             $expression = ($expression[0] === '(') ? substr($expression, 1, -1) : $expression;
-            return "<?php echo \Kyslik\ColumnSortable\SortableLink::render(\"{$expression}\");?>";
+            return "<?php echo \Kyslik\ColumnSortable\SortableLink::render(array ({$expression}));?>";
         });
     }
 

src/ColumnSortable/SortableLink.php

@@ -14,13 +14,11 @@ class SortableLink
 {
 
     /**
-     * @param String $parameters
+     * @param array $parameters
      * @return string
      */
-    public static function render($parameters)
+    public static function render(array $parameters)
     {
-        $parameters = str_getcsv($parameters, ',', '\'');
-
         if (count($parameters) === 1) {
             $title = self::getOneToOneSortOrNull($parameters[0]);
             $title = (is_null($title)) ? $parameters[0] : $title[1];