A practical example of a router with multiple rules, demonstrating LIFO precedence and handling of a '404 Not Found' case.

ID: 1436

See: Project: Developing a Basic Web Server Route Matcher 
				
					using uCalcSoftware;

var uc = new uCalc();
using (var router = new uCalc.Transformer()) {
   // --- Define Routes ---
   // General rules first (lower precedence)
   router.FromTo("/products/{category}/{id}", "Handler: ProductDetail, category: {category}, id: {id}");
   router.FromTo("/users/{id}", "Handler: UserProfile, id: {id}");

   // Specific rule last (higher precedence)
   router.FromTo("/users/new", "Handler: CreateUserPage");

   // --- Simulate Requests ---
   string[] urls = {"/users/123", "/users/new", "/products/electronics/567", "/contact"};

   foreach(var url in urls) {
      var originalUrl = url;
      var result = router.Transform(url);

      if (result.Text == originalUrl) {
         Console.WriteLine($"URL: {originalUrl} -> 404 Not Found");
      } else {
         Console.WriteLine($"URL: {originalUrl} -> {result}");
      }
   }
}
				
			
URL: /users/123 -> Handler: UserProfile, id: 123
URL: /users/new -> Handler: CreateUserPage
URL: /products/electronics/567 -> Handler: ProductDetail, category: electronics, id: 567
URL: /contact -> 404 Not Found
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   {
      uCalc::Transformer router;
      router.Owned(); // Causes router to be released when it goes out of scope
      // --- Define Routes ---
      // General rules first (lower precedence)
      router.FromTo("/products/{category}/{id}", "Handler: ProductDetail, category: {category}, id: {id}");
      router.FromTo("/users/{id}", "Handler: UserProfile, id: {id}");

      // Specific rule last (higher precedence)
      router.FromTo("/users/new", "Handler: CreateUserPage");

      // --- Simulate Requests ---
      vector<string> urls = {"/users/123", "/users/new", "/products/electronics/567", "/contact"};

      for(auto url : urls) {
         auto originalUrl = url;
         auto result = router.Transform(url);

         if (result.Text() == originalUrl) {
            cout << "URL: " << originalUrl << " -> 404 Not Found" << endl;
         } else {
            cout << "URL: " << originalUrl << " -> " << result << endl;
         }
      }
   }
}
				
			
URL: /users/123 -> Handler: UserProfile, id: 123
URL: /users/new -> Handler: CreateUserPage
URL: /products/electronics/567 -> Handler: ProductDetail, category: electronics, id: 567
URL: /contact -> 404 Not Found
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Using router As New uCalc.Transformer()
         '// --- Define Routes ---
         '// General rules first (lower precedence)
         router.FromTo("/products/{category}/{id}", "Handler: ProductDetail, category: {category}, id: {id}")
         router.FromTo("/users/{id}", "Handler: UserProfile, id: {id}")
         
         '// Specific rule last (higher precedence)
         router.FromTo("/users/new", "Handler: CreateUserPage")
         
         '// --- Simulate Requests ---
         Dim urls() As String = {"/users/123", "/users/new", "/products/electronics/567", "/contact"}
         
         For Each url In urls
            Dim originalUrl = url
            Dim result = router.Transform(url)
            
            If result.Text = originalUrl Then
               Console.WriteLine($"URL: {originalUrl} -> 404 Not Found")
            Else
               Console.WriteLine($"URL: {originalUrl} -> {result}")
            End If
         Next
      End Using
   End Sub
End Module
				
			
URL: /users/123 -> Handler: UserProfile, id: 123
URL: /users/new -> Handler: CreateUserPage
URL: /products/electronics/567 -> Handler: ProductDetail, category: electronics, id: 567
URL: /contact -> 404 Not Found
Explore 600+ other examples