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route.go
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route.go
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// Copyright (C) 2023 Shanhu Tech Inc.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package aries
import (
"bytes"
"strings"
)
type routePart struct {
start, end int
}
type route struct {
p string
parts []*routePart
routes []string
isDir bool
}
func newRoute(p string) *route {
if p == "" {
return new(route)
}
w := new(bytes.Buffer)
n := len(p)
isDir := p[n-1] == '/'
splits := strings.Split(p, "/")
var parts []*routePart
var routes []string
for _, s := range splits {
if len(s) == 0 {
continue
}
w.WriteString("/")
start := w.Len()
w.WriteString(s)
end := w.Len()
parts = append(parts, &routePart{
start: start,
end: end,
})
routes = append(routes, s)
}
return &route{
p: w.String(),
parts: parts,
routes: routes,
isDir: isDir,
}
}
func (r *route) path() string { return r.p }
func (r *route) size() int { return len(r.routes) }
func (r *route) dir(i int) string {
if i >= len(r.parts) {
return r.p
}
return r.p[:r.parts[i].start]
}
func (r *route) current(i int) string {
if i >= len(r.parts) {
return ""
}
part := r.parts[i]
return r.p[part.start:part.end]
}
func (r *route) rel(i int) string {
if i >= len(r.parts) {
return ""
}
return r.p[r.parts[i].start:]
}
func (r *route) relRoute(i int) []string {
if i >= len(r.routes) {
return nil
}
return r.routes[i:]
}