Reimplement generics

README.md

@@ -3,6 +3,8 @@
 A radix-tree based no-allocation router in Go. All credit to Eduard Urbach for his incredible work. This router sports
 a fancy PATRICIA tree structure for efficient string lookups. It also has ***zero dependencies***!
 
+The router has a generic data structure, so any kind of handler can be used.
+
 ## Installation
 
 ```shell

router.go

@@ -1,30 +1,30 @@
 package router
 
-type Router struct {
+type Router[T any] struct {
-	get     Tree
+	get     Tree[T]
-	post    Tree
+	post    Tree[T]
-	delete  Tree
+	delete  Tree[T]
-	put     Tree
+	put     Tree[T]
-	patch   Tree
+	patch   Tree[T]
-	head    Tree
+	head    Tree[T]
-	connect Tree
+	connect Tree[T]
-	trace   Tree
+	trace   Tree[T]
-	options Tree
+	options Tree[T]
 }
 
 // Create a new Router containing trees for every HTTP method.
-func New() *Router {
+func New[T any]() *Router[T] {
-	return &Router{}
+	return &Router[T]{}
 }
 
 // Registers a new handler for the given method and path.
-func (router *Router) Add(method string, path string, handler string) {
+func (router *Router[T]) Add(method string, path string, handler T) {
 	tree := router.selectTree(method)
 	tree.Add(path, handler)
 }
 
 // Finds the handler and parameters for the given route.
-func (router *Router) Lookup(method string, path string) (string, []Parameter) {
+func (router *Router[T]) Lookup(method string, path string) (T, []Parameter) {
 	if method[0] == 'G' {
 		return router.get.Lookup(path)
 	}
@@ -34,7 +34,7 @@ func (router *Router) Lookup(method string, path string) (string, []Parameter) {
 }
 
 // Finds the handler and parameters for the given route without using any memory allocations.
-func (router *Router) LookupNoAlloc(method string, path string, addParameter func(string, string)) string {
+func (router *Router[T]) LookupNoAlloc(method string, path string, addParameter func(string, string)) T {
 	if method[0] == 'G' {
 		return router.get.LookupNoAlloc(path, addParameter)
 	}
@@ -44,7 +44,7 @@ func (router *Router) LookupNoAlloc(method string, path string, addParameter fun
 }
 
 // Traverses all trees and calls the given function on every node.
-func (router *Router) Map(transform func(string) string) {
+func (router *Router[T]) Map(transform func(T) T) {
 	router.get.Map(transform)
 	router.post.Map(transform)
 	router.delete.Map(transform)
@@ -57,7 +57,7 @@ func (router *Router) Map(transform func(string) string) {
 }
 
 // Returns the tree of the given HTTP method.
-func (router *Router) selectTree(method string) *Tree {
+func (router *Router[T]) selectTree(method string) *Tree[T] {
 	switch method {
 	case "GET":
 		return &router.get

tests/benchmark_test.go

@@ -11,7 +11,7 @@ import (
 
 func BenchmarkBlog(b *testing.B) {
 	routes := routes("blog.txt")
-	r := router.New()
+	r := router.New[string]()
 
 	for _, route := range routes {
 		r.Add(route.Method, route.Path, "")
@@ -44,7 +44,7 @@ func BenchmarkBlog(b *testing.B) {
 
 func BenchmarkGithub(b *testing.B) {
 	routes := routes("github.txt")
-	r := router.New()
+	r := router.New[string]()
 
 	for _, route := range routes {
 		r.Add(route.Method, route.Path, "")

tests/router_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestHello(t *testing.T) {
-	r := router.New()
+	r := router.New[string]()
 	r.Add("GET", "/blog", "Blog")
 	r.Add("GET", "/blog/post", "Blog post")
 

tree.go

@@ -1,12 +1,12 @@
 package router
 
 // Super-fancy radix tree
-type Tree struct {
+type Tree[T any] struct {
-	root TreeNode
+	root TreeNode[T]
 }
 
 // Adds a new element to the tree
-func (tree *Tree) Add(path string, data string) {
+func (tree *Tree[T]) Add(path string, data T) {
 	// Search tree for equal parts until we can no longer proceed
 	i := 0
 	offset := 0
@@ -79,7 +79,7 @@ func (tree *Tree) Add(path string, data string) {
 }
 
 // Lookup finds the data for the given path.
-func (tree *Tree) Lookup(path string) (string, []Parameter) {
+func (tree *Tree[T]) Lookup(path string) (T, []Parameter) {
 	var params []Parameter
 
 	data := tree.LookupNoAlloc(path, func(key string, value string) {
@@ -90,11 +90,11 @@ func (tree *Tree) Lookup(path string) (string, []Parameter) {
 }
 
 // Finds the data for the given path without using any memory allocations.
-func (tree *Tree) LookupNoAlloc(path string, addParameter func(key string, value string)) string {
+func (tree *Tree[T]) LookupNoAlloc(path string, addParameter func(key string, value string)) T {
 	var (
 		i            uint
 		wildcardPath string
-		wildcard     *TreeNode
+		wildcard     *TreeNode[T]
 		node         = &tree.root
 	)
 
@@ -183,13 +183,13 @@ notFound:
 		return wildcard.data
 	}
 
-	var empty string
+	var empty T
 	return empty
 }
 
 // Binds all handlers to a new one provided by the callback.
-func (tree *Tree) Map(transform func(string) string) {
+func (tree *Tree[T]) Map(transform func(T) T) {
-	tree.root.each(func(node *TreeNode) {
+	tree.root.each(func(node *TreeNode[T]) {
 		node.data = transform(node.data)
 	})
 }

treeNode.go

@@ -10,12 +10,12 @@ const (
 )
 
 // A node on our radix tree
-type TreeNode struct {
+type TreeNode[T any] struct {
 	prefix    string
-	data      string
+	data      T
-	children  []*TreeNode
+	children  []*TreeNode[T]
-	parameter *TreeNode
+	parameter *TreeNode[T]
-	wildcard  *TreeNode
+	wildcard  *TreeNode[T]
 	indexes   []uint8
 	start     uint8
 	end       uint8
@@ -26,7 +26,7 @@ type TreeNode struct {
 // node with the given path and data. If path is empty, it will
 // not create another child node and instead assign the data
 // directly to the node.
-func (node *TreeNode) split(index int, path string, data string) {
+func (node *TreeNode[T]) split(index int, path string, data T) {
 	// Create split node with the remaining string
 	splitNode := node.clone(node.prefix[index:])
 
@@ -48,8 +48,8 @@ func (node *TreeNode) split(index int, path string, data string) {
 }
 
 // Clone the node with a new prefix
-func (node *TreeNode) clone(prefix string) *TreeNode {
+func (node *TreeNode[T]) clone(prefix string) *TreeNode[T] {
-	return &TreeNode{
+	return &TreeNode[T]{
 		prefix:    prefix,
 		data:      node.data,
 		children:  node.children,
@@ -63,8 +63,8 @@ func (node *TreeNode) clone(prefix string) *TreeNode {
 }
 
 // Reset the node, set the prefix
-func (node *TreeNode) reset(prefix string) {
+func (node *TreeNode[T]) reset(prefix string) {
-	var empty string
+	var empty T
 	node.prefix = prefix
 	node.data = empty
 	node.children = nil
@@ -77,7 +77,7 @@ func (node *TreeNode) reset(prefix string) {
 }
 
 // Append the given path to the tree
-func (node *TreeNode) append(path string, data string) {
+func (node *TreeNode[T]) append(path string, data T) {
 	// At this point, all we know is that somewhere
 	// in the remaining string we have parameters.
 	// node: /user|
@@ -106,7 +106,7 @@ func (node *TreeNode) append(path string, data string) {
 				return
 			}
 
-			child := &TreeNode{
+			child := &TreeNode[T]{
 				prefix: path,
 				data:   data,
 			}
@@ -125,7 +125,7 @@ func (node *TreeNode) append(path string, data string) {
 				paramEnd = len(path)
 			}
 
-			child := &TreeNode{
+			child := &TreeNode[T]{
 				prefix: path[1:paramEnd],
 				kind:   path[paramStart],
 			}
@@ -156,7 +156,7 @@ func (node *TreeNode) append(path string, data string) {
 		}
 
 		// Add a normal node with the path before the parameter start.
-		child := &TreeNode{
+		child := &TreeNode[T]{
 			prefix: path[:paramStart],
 		}
 
@@ -173,7 +173,7 @@ func (node *TreeNode) append(path string, data string) {
 }
 
 // Add a child tree node
-func (node *TreeNode) addChild(child *TreeNode) {
+func (node *TreeNode[T]) addChild(child *TreeNode[T]) {
 	if len(node.children) == 0 {
 		node.children = append(node.children, nil)
 	}
@@ -213,19 +213,19 @@ func (node *TreeNode) addChild(child *TreeNode) {
 	node.children[index] = child
 }
 
-func (node *TreeNode) addTrailingSlash(data string) {
+func (node *TreeNode[T]) addTrailingSlash(data T) {
 	if strings.HasSuffix(node.prefix, "/") || node.kind == wildcard || (separator >= node.start && separator < node.end && node.indexes[separator-node.start] != 0) {
 		return
 	}
 
-	node.addChild(&TreeNode{
+	node.addChild(&TreeNode[T]{
 		prefix: "/",
 		data:   data,
 	})
 }
 
 // Traverses the tree and calls the given function on every node.
-func (node *TreeNode) each(callback func(*TreeNode)) {
+func (node *TreeNode[T]) each(callback func(*TreeNode[T])) {
 	callback(node)
 
 	for _, child := range node.children {
@@ -247,7 +247,7 @@ func (node *TreeNode) each(callback func(*TreeNode)) {
 
 // Called when the node was fully parsed and needs to decide the next control flow.
 // finish is only called from `tree.Add`.
-func (node *TreeNode) finish(path string, data string, i int, offset int) (*TreeNode, int, Flow) {
+func (node *TreeNode[T]) finish(path string, data T, i int, offset int) (*TreeNode[T], int, Flow) {
 	char := path[i]
 
 	if char >= node.start && char < node.end {