Hold matched route full path in the Context (#1826)

* Return nodeValue from getValue method

* Hold route full path in the Context

* Add small example

context.go

@@ -48,6 +48,7 @@ type Context struct {
 	Params   Params
 	handlers HandlersChain
 	index    int8
+	fullPath string
 
 	engine *Engine
 
@@ -70,6 +71,7 @@ func (c *Context) reset() {
 	c.Params = c.Params[0:0]
 	c.handlers = nil
 	c.index = -1
+	c.fullPath = ""
 	c.Keys = nil
 	c.Errors = c.Errors[0:0]
 	c.Accepted = nil
@@ -111,6 +113,15 @@ func (c *Context) Handler() HandlerFunc {
 	return c.handlers.Last()
 }
 
+// FullPath returns a matched route full path. For not found routes
+// returns an empty string.
+//     router.GET("/user/:id", func(c *gin.Context) {
+//         c.FullPath() == "/user/:id" // true
+//     })
+func (c *Context) FullPath() string {
+	return c.fullPath
+}
+
 /************************************/
 /*********** FLOW CONTROL ***********/
 /************************************/