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