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|
package gitattributes
import (
"path/filepath"
"strings"
)
const (
patternDirSep = "/"
zeroToManyDirs = "**"
)
// Pattern defines a gitattributes pattern.
type Pattern interface {
// Match matches the given path to the pattern.
Match(path []string) bool
}
type pattern struct {
domain []string
pattern []string
}
// ParsePattern parses a gitattributes pattern string into the Pattern
// structure.
func ParsePattern(p string, domain []string) Pattern {
return &pattern{
domain: domain,
pattern: strings.Split(p, patternDirSep),
}
}
func (p *pattern) Match(path []string) bool {
if len(path) <= len(p.domain) {
return false
}
for i, e := range p.domain {
if path[i] != e {
return false
}
}
if len(p.pattern) == 1 {
// for a simple rule, .gitattribute matching rules differs from
// .gitignore and only the last part of the path is considered.
path = path[len(path)-1:]
} else {
path = path[len(p.domain):]
}
pattern := p.pattern
var match, doublestar bool
var err error
for _, part := range path {
// skip empty
if pattern[0] == "" {
pattern = pattern[1:]
}
// eat doublestar
if pattern[0] == zeroToManyDirs {
pattern = pattern[1:]
if len(pattern) == 0 {
return true
}
doublestar = true
}
switch {
case strings.Contains(pattern[0], "**"):
return false
// keep going down the path until we hit a match
case doublestar:
match, err = filepath.Match(pattern[0], part)
if err != nil {
return false
}
if match {
doublestar = false
pattern = pattern[1:]
}
default:
match, err = filepath.Match(pattern[0], part)
if err != nil {
return false
}
if !match {
return false
}
pattern = pattern[1:]
}
}
if len(pattern) > 0 {
return false
}
return match
}
|
