56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
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// Copyright (C) 2024 Umorpha Systems
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// SPDX-License-Identifier: AGPL-3.0-or-later
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package main
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import (
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"fmt"
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"regexp"
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"strings"
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)
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func url2id(url string) string {
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// > Clients MUST strip a trailing `/`, if present, from the
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// > user supplied `$GIT_URL` string
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// -- gitprotocol-http(5)
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url = strings.TrimRight(url, "/")
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var id strings.Builder
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id.Grow(len(url))
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for _, r := range url {
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switch {
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case r == '!', // our own escape
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// see: git-check-ref-format(1)
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r <= ' ', r == '\x7F', // never: ASCII control characters
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r == '~', r == '^', r == ':', // never: gitrevision meaning
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r == '?', r == '*', r == '[', // never: refspec pattern
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r == '\\', // never: backslash
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r == '.', r == '@', r == '/': // sometimes: special rules
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fmt.Fprintf(&id, "!%02x", r)
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default:
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id.WriteRune(r)
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}
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}
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return id.String()
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}
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var reEsc = regexp.MustCompile("![0-9a-f]{2}")
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func hex2int(h byte) byte {
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switch {
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case '0' <= h && h <= '9':
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return h - '0'
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case 'a' <= h && h <= 'f':
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return h - 'a'
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default:
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panic("should not happen")
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}
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}
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func id2url(id string) string {
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return reEsc.ReplaceAllStringFunc(id, func(esc string) string {
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r := rune(hex2int(esc[1]))<<4 | rune(hex2int(esc[2]))
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return string([]rune{r})
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})
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}
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