glayzzle#46 add a specific node for nowdoc elements

Author: ichiriac

src/ast/nowdoc.js

@@ -0,0 +1,22 @@
+/*!
+ * Copyright (C) 2017 Glayzzle (BSD3 License)
+ * @authors https://github.com/glayzzle/php-parser/graphs/contributors
+ * @url http://glayzzle.com
+ */
+
+var Literal = require('./literal');
+var KIND = 'nowdoc';
+
+/**
+ * Defines a nowdoc string
+ * @constructor String
+ * @extends {Literal}
+ * @property {String} label
+
+ */
+var Nowdoc = Literal.extends(function Nowdoc(value, label, location) {
+  Literal.apply(this, [KIND, value, location]);
+  this.label = label;
+});
+
+module.exports = Nowdoc;