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beego:router tree

This commit is contained in:
astaxie 2014-06-04 23:07:57 +08:00
parent f06ba52ede
commit bfabcfcb6b
2 changed files with 424 additions and 0 deletions

306
tree.go Normal file
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package beego
import (
"path"
"regexp"
"strings"
"github.com/astaxie/beego/utils"
)
type Tree struct {
//search fix route first
fixrouters map[string]*Tree
//if set, failure to match fixrouters search then search wildcard
wildcard *Tree
//if set, failure to match wildcard search
leaf *leafInfo
}
func NewTree() *Tree {
return &Tree{
fixrouters: make(map[string]*Tree),
}
}
// call addseg function
func (t *Tree) AddRouter(pattern string, runObject interface{}) {
t.addseg(splitPath(pattern), runObject, nil, "")
}
// "/"
// "admin" ->
func (t *Tree) addseg(segments []string, route interface{}, wildcards []string, reg string) {
if len(segments) == 0 {
if reg != "" {
filterCards := []string{}
for _, v := range wildcards {
if v == ":" || v == "." {
continue
}
filterCards = append(filterCards, v)
}
t.leaf = &leafInfo{runObject: route, wildcards: wildcards, regexps: regexp.MustCompile("^" + reg + "$")}
} else {
t.leaf = &leafInfo{runObject: route, wildcards: wildcards}
}
} else {
seg := segments[0]
iswild, params, regexpStr := splitSegment(seg)
if iswild {
if t.wildcard == nil {
t.wildcard = NewTree()
}
t.wildcard.addseg(segments[1:], route, append(wildcards, params...), reg+regexpStr)
} else {
subTree, ok := t.fixrouters[seg]
if !ok {
subTree = NewTree()
t.fixrouters[seg] = subTree
}
subTree.addseg(segments[1:], route, wildcards, reg)
}
}
}
// match router to runObject & params
func (t *Tree) Match(pattern string) (runObject interface{}, params map[string]string) {
if len(pattern) == 0 || pattern[0] != '/' {
return nil, nil
}
return t.match(splitPath(pattern), nil)
}
func (t *Tree) match(segments []string, wildcardValues []string) (runObject interface{}, params map[string]string) {
// Handle leaf nodes:
if len(segments) == 0 {
if t.leaf != nil {
if ok, pa := t.leaf.match(wildcardValues); ok {
return t.leaf.runObject, pa
}
}
return nil, nil
}
var seg string
seg, segments = segments[0], segments[1:]
subTree, ok := t.fixrouters[seg]
if ok {
runObject, params = subTree.match(segments, wildcardValues)
}
if runObject == nil && t.wildcard != nil {
runObject, params = t.wildcard.match(segments, append(wildcardValues, seg))
}
if runObject == nil {
if t.leaf != nil {
if ok, pa := t.leaf.match(append(wildcardValues, seg)); ok {
return t.leaf.runObject, pa
}
}
}
return runObject, params
}
type leafInfo struct {
// names of wildcards that lead to this leaf. eg, ["id" "name"] for the wildcard ":id" and ":name"
wildcards []string
// if the leaf is regexp
regexps *regexp.Regexp
runObject interface{}
}
func (leaf *leafInfo) match(wildcardValues []string) (ok bool, params map[string]string) {
if leaf.regexps == nil {
// has error
if len(wildcardValues) == 0 && len(leaf.wildcards) > 0 {
if utils.InSlice(":", leaf.wildcards) {
return true, nil
}
Error("bug of router")
return false, nil
} else if len(wildcardValues) == 0 { // static path
return true, nil
}
// match *
if len(leaf.wildcards) == 1 && leaf.wildcards[0] == ":splat" {
params = make(map[string]string)
params[":splat"] = path.Join(wildcardValues...)
return true, params
}
// match *.*
if len(leaf.wildcards) == 3 && leaf.wildcards[0] == "." {
params = make(map[string]string)
lastone := wildcardValues[len(wildcardValues)-1]
strs := strings.SplitN(lastone, ".", 2)
if len(strs) == 2 {
params[":ext"] = strs[1]
} else {
params[":ext"] = ""
}
params[":path"] = path.Join(wildcardValues[:len(wildcardValues)-1]...) + "/" + strs[0]
return true, params
}
// match :id
params = make(map[string]string)
j := 0
for _, v := range leaf.wildcards {
if v == ":" {
continue
}
params[v] = wildcardValues[j]
j += 1
}
if len(params) != len(wildcardValues) {
Error("bug of router")
return false, nil
}
return true, params
}
if !leaf.regexps.MatchString(strings.Join(wildcardValues, "")) {
return false, nil
}
params = make(map[string]string)
matches := leaf.regexps.FindStringSubmatch(strings.Join(wildcardValues, ""))
for i, match := range matches[1:] {
params[leaf.wildcards[i]] = match
}
return true, params
}
// "/" -> []
// "/admin" -> ["admin"]
// "/admin/" -> ["admin"]
// "/admin/users" -> ["admin", "users"]
func splitPath(key string) []string {
elements := strings.Split(key, "/")
if elements[0] == "" {
elements = elements[1:]
}
if elements[len(elements)-1] == "" {
elements = elements[:len(elements)-1]
}
return elements
}
// "admin" -> false, nil, ""
// ":id" -> true, [:id], ""
// "?:id" -> true, [: id], "" : meaning can empty
// ":id:int" -> true, [:id], ([0-9]+)
// ":name:string" -> true, [:name], ([\w]+)
// ":id([0-9]+)" -> true, [:id], ([0-9]+)
// ":id([0-9]+)_:name" -> true, [:id :name], ([0-9]+)_(.+)
// "cms_:id_:page.html" -> true, [:id :page], cms_(.+)_(.+).html
// "*" -> true, [:splat], ""
// "*.*" -> true,[. :path :ext], "" . meaning separator
func splitSegment(key string) (bool, []string, string) {
if strings.HasPrefix(key, "*") {
if key == "*.*" {
return true, []string{".", ":path", ":ext"}, ""
} else {
return true, []string{":splat"}, ""
}
}
if strings.ContainsAny(key, ":") {
var paramsNum int
var out []rune
var start bool
var startexp bool
var param []rune
var expt []rune
var skipnum int
params := []string{}
reg := regexp.MustCompile(`[a-zA-Z0-9]+`)
for i, v := range key {
if skipnum > 0 {
skipnum -= 1
continue
}
if start {
//:id:int and :name:string
if v == ':' {
if len(key) >= i+4 {
if key[i+1:i+4] == "int" {
out = append(out, []rune("([0-9]+)")...)
params = append(params, ":"+string(param))
start = false
startexp = false
skipnum = 3
param = make([]rune, 0)
paramsNum += 1
continue
}
}
if len(key) >= i+7 {
if key[i+1:i+7] == "string" {
out = append(out, []rune(`([\w]+)`)...)
params = append(params, ":"+string(param))
paramsNum += 1
start = false
startexp = false
skipnum = 6
param = make([]rune, 0)
continue
}
}
}
// params only support a-zA-Z0-9
if reg.MatchString(string(v)) {
param = append(param, v)
continue
}
if v != '(' {
out = append(out, []rune(`(.+)`)...)
params = append(params, ":"+string(param))
param = make([]rune, 0)
paramsNum += 1
start = false
startexp = false
}
}
if startexp {
if v != ')' {
expt = append(expt, v)
continue
}
}
if v == ':' {
param = make([]rune, 0)
start = true
} else if v == '(' {
startexp = true
start = false
params = append(params, ":"+string(param))
paramsNum += 1
expt = make([]rune, 0)
expt = append(expt, '(')
} else if v == ')' {
startexp = false
expt = append(expt, ')')
out = append(out, expt...)
param = make([]rune, 0)
} else if v == '?' {
params = append(params, ":")
} else {
out = append(out, v)
}
}
if len(param) > 0 {
if paramsNum > 0 {
out = append(out, []rune(`(.+)`)...)
}
params = append(params, ":"+string(param))
}
return true, params, string(out)
} else {
return false, nil, ""
}
}

118
tree_test.go Normal file
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package beego
import "testing"
type testinfo struct {
url string
requesturl string
params map[string]string
}
var routers []testinfo
func init() {
routers = make([]testinfo, 0)
routers = append(routers, testinfo{"/:id", "/123", map[string]string{":id": "123"}})
routers = append(routers, testinfo{"/", "/", nil})
routers = append(routers, testinfo{"/customer/login", "/customer/login", nil})
routers = append(routers, testinfo{"/*", "/customer/123", map[string]string{":splat": "customer/123"}})
routers = append(routers, testinfo{"/*.*", "/nice/api.json", map[string]string{":path": "nice/api", ":ext": "json"}})
routers = append(routers, testinfo{"/v1/shop/:id:int", "/v1/shop/123", map[string]string{":id": "123"}})
routers = append(routers, testinfo{"/v1/shop/:id/:name", "/v1/shop/123/nike", map[string]string{":id": "123", ":name": "nike"}})
routers = append(routers, testinfo{"/v1/shop/:id/account", "/v1/shop/123/account", map[string]string{":id": "123"}})
routers = append(routers, testinfo{"/v1/shop/:name:string", "/v1/shop/nike", map[string]string{":name": "nike"}})
routers = append(routers, testinfo{"/v1/shop/:id([0-9]+)", "/v1/shop//123", map[string]string{":id": "123"}})
routers = append(routers, testinfo{"/v1/shop/:id([0-9]+)_:name", "/v1/shop/123_nike", map[string]string{":id": "123", ":name": "nike"}})
routers = append(routers, testinfo{"/v1/shop/:id_cms.html", "/v1/shop/123_cms.html", map[string]string{":id": "123"}})
routers = append(routers, testinfo{"/v1/shop/cms_:id_:page.html", "/v1/shop/cms_123_1.html", map[string]string{":id": "123", ":page": "1"}})
}
func TestTreeRouters(t *testing.T) {
for _, r := range routers {
tr := NewTree()
tr.AddRouter(r.url, "astaxie")
obj, param := tr.Match(r.requesturl)
if obj == nil || obj.(string) != "astaxie" {
t.Fatal(r.url + " can't get obj ")
}
if r.params != nil {
for k, v := range r.params {
if vv, ok := param[k]; !ok {
t.Fatal(r.url + r.requesturl + " get param empty:" + k)
} else if vv != v {
t.Fatal(r.url + " " + r.requesturl + " should be:" + v + " get param:" + vv)
}
}
}
}
}
func TestSplitPath(t *testing.T) {
a := splitPath("/")
if len(a) != 0 {
t.Fatal("/ should retrun []")
}
a = splitPath("/admin")
if len(a) != 1 || a[0] != "admin" {
t.Fatal("/admin should retrun [admin]")
}
a = splitPath("/admin/")
if len(a) != 1 || a[0] != "admin" {
t.Fatal("/admin/ should retrun [admin]")
}
a = splitPath("/admin/users")
if len(a) != 2 || a[0] != "admin" || a[1] != "users" {
t.Fatal("/admin should retrun [admin users]")
}
a = splitPath("/admin/:id:int")
if len(a) != 2 || a[0] != "admin" || a[1] != ":id:int" {
t.Fatal("/admin should retrun [admin :id:int]")
}
}
func TestSplitSegment(t *testing.T) {
b, w, r := splitSegment("admin")
if b || len(w) != 0 || r != "" {
t.Fatal("admin should return false, nil, ''")
}
b, w, r = splitSegment("*")
if !b || len(w) != 1 || w[0] != ":splat" || r != "" {
t.Fatal("* should return true, [:splat], ''")
}
b, w, r = splitSegment("*.*")
if !b || len(w) != 3 || w[1] != ":path" || w[2] != ":ext" || w[0] != "." || r != "" {
t.Fatal("admin should return true,[. :path :ext], ''")
}
b, w, r = splitSegment(":id")
if !b || len(w) != 1 || w[0] != ":id" || r != "" {
t.Fatal(":id should return true, [:id], ''")
}
b, w, r = splitSegment("?:id")
if !b || len(w) != 2 || w[0] != ":" || w[1] != ":id" || r != "" {
t.Fatal("?:id should return true, [: :id], ''")
}
b, w, r = splitSegment(":id:int")
if !b || len(w) != 1 || w[0] != ":id" || r != "([0-9]+)" {
t.Fatal(":id:int should return true, [:id], '([0-9]+)'")
}
b, w, r = splitSegment(":name:string")
if !b || len(w) != 1 || w[0] != ":name" || r != `([\w]+)` {
t.Fatal(`:name:string should return true, [:name], '([\w]+)'`)
}
b, w, r = splitSegment(":id([0-9]+)")
if !b || len(w) != 1 || w[0] != ":id" || r != `([0-9]+)` {
t.Fatal(`:id([0-9]+) should return true, [:id], '([0-9]+)'`)
}
b, w, r = splitSegment(":id([0-9]+)_:name")
if !b || len(w) != 2 || w[0] != ":id" || w[1] != ":name" || r != `([0-9]+)_(.+)` {
t.Fatal(`:id([0-9]+)_:name should return true, [:id :name], '([0-9]+)_(.+)'`)
}
b, w, r = splitSegment(":id_cms.html")
if !b || len(w) != 1 || w[0] != ":id" || r != `(.+)_cms.html` {
t.Fatal(":id_cms.html should return true, [:id], '(.+)_cms.html'")
}
b, w, r = splitSegment("cms_:id_:page.html")
if !b || len(w) != 2 || w[0] != ":id" || w[1] != ":page" || r != `cms_(.+)_(.+).html` {
t.Fatal(":id_cms.html should return true, [:id :page], cms_(.+)_(.+).html")
}
}