opFilter

['$filter', function($filter){
    return function(array, expression, comparator){
      var filterIf = function(check){
        var filtered = [];
        for(var i=0; i < array.length; i++){
          var value = array[i];
          if(check(value)){
            filtered.push(value);
          }
        }
        return filtered;
      }
      var search = expression.searchable || "";
      var op = search[0];
      var term = search.substr(1);
      switch(op){
        case '>':
          return filterIf(function(value){return !term || value.progress >= parseInt(term);});
          break;
        case '<':
          return filterIf(function(value){return !term || value.progress <= parseInt(term);});
          break;
        case '!':
          return filterIf(function(value){return value.progress >= 100;});
          break;
        default:
          return $filter('filter')(array, expression, comparator);
      }
    }
  }]