libgo/go/cmd/go/internal/modfile/gopkgin.go

   1 // Copyright 2018 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // TODO: Figure out what gopkg.in should do.
   6
   7 package modfile
   8
   9 import "strings"
  10
  11 // ParseGopkgIn splits gopkg.in import paths into their constituent parts
  12 func ParseGopkgIn(path string) (root, repo, major, subdir string, ok bool) {
  13         if !strings.HasPrefix(path, "gopkg.in/") {
  14                 return
  15         }
  16         f := strings.Split(path, "/")
  17         if len(f) >= 2 {
  18                 if elem, v, ok := dotV(f[1]); ok {
  19                         root = strings.Join(f[:2], "/")
  20                         repo = "github.com/go-" + elem + "/" + elem
  21                         major = v
  22                         subdir = strings.Join(f[2:], "/")
  23                         return root, repo, major, subdir, true
  24                 }
  25         }
  26         if len(f) >= 3 {
  27                 if elem, v, ok := dotV(f[2]); ok {
  28                         root = strings.Join(f[:3], "/")
  29                         repo = "github.com/" + f[1] + "/" + elem
  30                         major = v
  31                         subdir = strings.Join(f[3:], "/")
  32                         return root, repo, major, subdir, true
  33                 }
  34         }
  35         return
  36 }
  37
  38 func dotV(name string) (elem, v string, ok bool) {
  39         i := len(name) - 1
  40         for i >= 0 && '0' <= name[i] && name[i] <= '9' {
  41                 i--
  42         }
  43         if i <= 2 || i+1 >= len(name) || name[i-1] != '.' || name[i] != 'v' || name[i+1] == '0' && len(name) != i+2 {
  44                 return "", "", false
  45         }
  46         return name[:i-1], name[i:], true
  47 }