github.com/gernest/nezuko@v0.1.2/internal/modfile/gopkgin.go (about)

     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  }