Function extract

src/angular-dragdrop.js:52–64

(callbackName)

      return (scope[callback] || scope[constructor][callback]).apply(scope[callback] ? scope : scope[constructor], args);
      
      function extract(callbackName) {
        var atStartBracket = callbackName.indexOf('(') !== -1 ? callbackName.indexOf('(') : callbackName.length,
            atEndBracket = callbackName.lastIndexOf(')') !== -1 ? callbackName.lastIndexOf(')') : callbackName.length,
            args = callbackName.substring(atStartBracket + 1, atEndBracket), // matching function arguments inside brackets
            constructor = callbackName.indexOf('.') !== -1 ? callbackName.substr(0, callbackName.indexOf('.')) : null; // matching a string upto a dot to check ctrl as syntax
            constructor = scope[constructor] && typeof scope[constructor].constructor === 'function' ? constructor : null;

        return {
          callback: callbackName.substring(constructor && constructor.length + 1 || 0, atStartBracket),
          args: $.map(args && args.split(',') || [], function(item) { return [$parse(item)(scope)]; }),
          constructor: constructor
        }
      }
    };

    this.invokeDrop = function ($draggable, $droppable, event, ui) {