Extract the route related code to new class Router and add UT.

webcc/router.h

@@ -0,0 +1,51 @@
+#ifndef WEBCC_ROUTER_H_
+#define WEBCC_ROUTER_H_
+
+#include <regex>
+#include <string>
+
+#include "webcc/globals.h"
+#include "webcc/view.h"
+
+namespace webcc {
+
+class Router {
+public:
+  virtual ~Router() = default;
+
+  // Route a URL to a view.
+  // The URL should start with "/". E.g., "/instances".
+  bool Route(const std::string& url, ViewPtr view,
+             const Strings& methods = { "GET" });
+
+  // Route a URL (as regular expression) to a view.
+  // The URL should start with "/" and be a regular expression.
+  // E.g., "/instances/(\\d+)".
+  bool Route(const UrlRegex& regex_url, ViewPtr view,
+             const Strings& methods = { "GET" });
+
+  // Find the view by HTTP method and URL (path).
+  ViewPtr FindView(const std::string& method, const std::string& url,
+                   UrlArgs* args);
+
+  // Match the view by HTTP method and URL (path).
+  // Return if a view is matched or not.
+  // If the view asks for data streaming, |stream| will be set to true.
+  bool MatchView(const std::string& method, const std::string& url,
+                 bool* stream);
+
+private:
+  struct RouteInfo {
+    std::string url;
+    std::regex url_regex;
+    ViewPtr view;
+    Strings methods;
+  };
+
+  // Route table.
+  std::vector<RouteInfo> routes_;
+};
+
+}  // namespace webcc
+
+#endif  // WEBCC_ROUTER_H_