GetQueryTemplates and GetQueryRegexp extraction (#304)

Developers can now extract the query templates and regexps
from a router as lists of combined query pairs.

Author: paulbes

README.md

@@ -201,22 +201,34 @@ func main() {
     r.HandleFunc("/products", handler).Methods("POST")
     r.HandleFunc("/articles", handler).Methods("GET")
     r.HandleFunc("/articles/{id}", handler).Methods("GET", "PUT")
+    r.HandleFunc("/authors", handler).Queries("surname", "{surname}")
     r.Walk(func(route *mux.Route, router *mux.Router, ancestors []*mux.Route) error {
         t, err := route.GetPathTemplate()
         if err != nil {
             return err
         }
+        qt, err := route.GetQueriesTemplates()
+        if err != nil {
+            return err
+        }
         // p will contain regular expression is compatible with regular expression in Perl, Python, and other languages.
         // for instance the regular expression for path '/articles/{id}' will be '^/articles/(?P<v0>[^/]+)$'
         p, err := route.GetPathRegexp()
         if err != nil {
             return err
         }
+        // qr will contain a list of regular expressions with the same semantics as GetPathRegexp,
+        // just applied to the Queries pairs instead, e.g., 'Queries("surname", "{surname}") will return
+        // {"^surname=(?P<v0>.*)$}. Where each combined query pair will have an entry in the list.
+        qr, err := route.GetQueriesRegexp()
+        if err != nil {
+            return err
+        }
         m, err := route.GetMethods()
         if err != nil {
             return err
         }
-        fmt.Println(strings.Join(m, ","), t, p)
+        fmt.Println(strings.Join(m, ","), strings.Join(qt, ","), strings.Join(qr, ","), t, p)
         return nil
     })
     http.Handle("/", r)
@@ -339,22 +351,34 @@ r.HandleFunc("/", handler)
 r.HandleFunc("/products", handler).Methods("POST")
 r.HandleFunc("/articles", handler).Methods("GET")
 r.HandleFunc("/articles/{id}", handler).Methods("GET", "PUT")
+r.HandleFunc("/authors", handler).Queries("surname", "{surname}")
 r.Walk(func(route *mux.Route, router *mux.Router, ancestors []*mux.Route) error {
     t, err := route.GetPathTemplate()
     if err != nil {
         return err
     }
+    qt, err := route.GetQueriesTemplates()
+    if err != nil {
+        return err
+    }
     // p will contain a regular expression that is compatible with regular expressions in Perl, Python, and other languages.
     // For example, the regular expression for path '/articles/{id}' will be '^/articles/(?P<v0>[^/]+)$'.
     p, err := route.GetPathRegexp()
     if err != nil {
         return err
     }
+    // qr will contain a list of regular expressions with the same semantics as GetPathRegexp,
+    // just applied to the Queries pairs instead, e.g., 'Queries("surname", "{surname}") will return
+    // {"^surname=(?P<v0>.*)$}. Where each combined query pair will have an entry in the list.
+    qr, err := route.GetQueriesRegexp()
+    if err != nil {
+        return err
+    }
     m, err := route.GetMethods()
     if err != nil {
         return err
     }
-    fmt.Println(strings.Join(m, ","), t, p)
+    fmt.Println(strings.Join(m, ","), strings.Join(qt, ","), strings.Join(qr, ","), t, p)
     return nil
 })
 ```