Function callback

internal.js:1433–1439

(name, buffer, start, end)

			delete self[name + 'Mark'];
		},
		callback = function(name, buffer, start, end) {
			if (start !== undefined && start === end)
				return;
			var callbackSymbol = 'on' + name.substr(0, 1).toUpperCase() + name.substr(1);
			if (callbackSymbol in self)
				self[callbackSymbol](buffer, start, end);
		},
		dataCallback = function(name, clear) {
			var markSymbol = name + 'Mark';
			if (!(markSymbol in self))