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|
package gitignore
import (
"path/filepath"
"strings"
)
// MatchResult defines outcomes of a match, no match, exclusion or inclusion.
type MatchResult int
const (
// NoMatch defines the no match outcome of a match check
NoMatch MatchResult = iota
// Exclude defines an exclusion of a file as a result of a match check
Exclude
// Exclude defines an explicit inclusion of a file as a result of a match check
Include
)
const (
inclusionPrefix = "!"
zeroToManyDirs = "**"
patternDirSep = "/"
)
// Pattern defines a single gitignore pattern.
type Pattern interface {
// Match matches the given path to the pattern.
Match(path []string, isDir bool) MatchResult
}
type pattern struct {
domain []string
pattern []string
inclusion bool
dirOnly bool
isGlob bool
}
// ParsePattern parses a gitignore pattern string into the Pattern structure.
func ParsePattern(p string, domain []string) Pattern {
res := pattern{domain: domain}
if strings.HasPrefix(p, inclusionPrefix) {
res.inclusion = true
p = p[1:]
}
if !strings.HasSuffix(p, "\\ ") {
p = strings.TrimRight(p, " ")
}
if strings.HasSuffix(p, patternDirSep) {
res.dirOnly = true
p = p[:len(p)-1]
}
if strings.Contains(p, patternDirSep) {
res.isGlob = true
}
res.pattern = strings.Split(p, patternDirSep)
return &res
}
func (p *pattern) Match(path []string, isDir bool) MatchResult {
if len(path) <= len(p.domain) {
return NoMatch
}
for i, e := range p.domain {
if path[i] != e {
return NoMatch
}
}
path = path[len(p.domain):]
if p.isGlob && !p.globMatch(path, isDir) {
return NoMatch
} else if !p.isGlob && !p.simpleNameMatch(path, isDir) {
return NoMatch
}
if p.inclusion {
return Include
} else {
return Exclude
}
}
func (p *pattern) simpleNameMatch(path []string, isDir bool) bool {
for i, name := range path {
if match, err := filepath.Match(p.pattern[0], name); err != nil {
return false
} else if !match {
continue
}
if p.dirOnly && !isDir && i == len(path)-1 {
return false
}
return true
}
return false
}
func (p *pattern) globMatch(path []string, isDir bool) bool {
matched := false
canTraverse := false
for i, pattern := range p.pattern {
if pattern == "" {
canTraverse = false
continue
}
if pattern == zeroToManyDirs {
if i == len(p.pattern)-1 {
break
}
canTraverse = true
continue
}
if strings.Contains(pattern, zeroToManyDirs) {
return false
}
if len(path) == 0 {
return false
}
if canTraverse {
canTraverse = false
for len(path) > 0 {
e := path[0]
path = path[1:]
if match, err := filepath.Match(pattern, e); err != nil {
return false
} else if match {
matched = true
break
}
}
} else {
if match, err := filepath.Match(pattern, path[0]); err != nil || !match {
return false
}
matched = true
path = path[1:]
}
}
if matched && p.dirOnly && !isDir && len(path) == 0 {
matched = false
}
return matched
}
|
