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route.go
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route.go
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package pi
import (
"net/http"
"net/url"
"path"
"strings"
)
const (
dynamic = ':'
wildcard = '*'
anyone = "*"
)
type Route interface {
Search(route string, captured url.Values) Route
Invoke(ctx Context) error
Get(h HandlerFunc) Route
Post(h HandlerFunc) Route
Put(h HandlerFunc) Route
Delete(h HandlerFunc) Route
Patch(h HandlerFunc) Route
Options(h HandlerFunc) Route
Head(h HandlerFunc) Route
Any(h HandlerFunc) Route
}
var _ Route = (*_route)(nil)
type _route struct {
parent *_route
sub map[string]*_route
hmap map[string]HandlerFunc
pattern string
placeholder string
cc []func(HandlerFunc) HandlerFunc
hasDynamicChild bool
hasWildcardChild bool
}
func createRootRoute() *_route {
return &_route{}
}
func (p *_route) Search(route string, captured url.Values) Route {
route = path.Clean(route)
chunks := strings.Split(route, "/")
current := p
SEARCH:
for i := 0; i < len(chunks); i++ {
seg := chunks[i]
next, ok := current.sub[seg]
if ok {
current = next
continue
}
if current.hasDynamicChild {
next, ok = current.sub[string(dynamic)]
if ok {
captured.Add(next.placeholder, seg)
current = next // continues on dynamic route.
continue
}
}
if current.hasWildcardChild {
next, ok = current.sub[string(wildcard)]
if ok {
captured.Add(next.placeholder, strings.Join(chunks[i:], "/"))
// wildcard route should returns immediately.
return next
}
}
for current.parent != nil {
if current.parent.hasDynamicChild {
k := string(dynamic)
next = current.parent.sub[k]
if next != current {
i--
captured.Add(next.placeholder, chunks[i])
current = next
continue SEARCH
}
}
if current.parent.hasWildcardChild {
k := string(wildcard)
next = current.parent.sub[k]
if next != current {
i--
captured.Add(next.placeholder, strings.Join(chunks[i:], "/"))
return next
}
}
i--
current = current.parent
}
return nil
}
return current
}
func (p *_route) Insert(route string, cc ...func(HandlerFunc) HandlerFunc) *_route {
route = path.Clean(route)
current := p
for _, seg := range strings.Split(route, "/") {
if current.sub == nil {
current.sub = make(map[string]*_route)
}
next, ok := current.sub[seg]
if ok {
current = next
continue
}
next = &_route{
parent: current,
pattern: seg,
placeholder: seg,
}
if len(seg) > 0 {
switch next.pattern[0] {
case dynamic:
current.hasDynamicChild = true
next.placeholder = next.placeholder[1:]
current.sub[string(dynamic)] = next
case wildcard:
current.hasWildcardChild = true
next.placeholder = next.placeholder[1:]
current.sub[string(wildcard)] = next
}
}
current.sub[seg] = next
current = next
}
if current.hmap == nil {
current.hmap = make(map[string]HandlerFunc)
}
current.cc = cc
return current
}
func (p *_route) Invoke(ctx Context) error {
fn, ok := p.hmap[ctx.Method()]
if !ok {
fn, ok = p.hmap[anyone]
}
if !ok {
return ErrHandlerNotFound
}
return fn(ctx)
}
func (p *_route) For(method string, h HandlerFunc) Route {
p.hmap[method] = h.Connect(p.cc...)
return p
}
func (p *_route) Get(h HandlerFunc) Route {
return p.For(http.MethodGet, h)
}
func (p *_route) Post(h HandlerFunc) Route {
return p.For(http.MethodPost, h)
}
func (p *_route) Put(h HandlerFunc) Route {
return p.For(http.MethodPut, h)
}
func (p *_route) Delete(h HandlerFunc) Route {
return p.For(http.MethodDelete, h)
}
func (p *_route) Patch(h HandlerFunc) Route {
return p.For(http.MethodPatch, h)
}
func (p *_route) Options(h HandlerFunc) Route {
return p.For(http.MethodOptions, h)
}
func (p *_route) Head(h HandlerFunc) Route {
return p.For(http.MethodHead, h)
}
func (p *_route) Any(h HandlerFunc) Route {
return p.For(string(wildcard), h)
}