forked from TrueCloudLab/restic
122 lines
2.6 KiB
Go
122 lines
2.6 KiB
Go
package filter
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import (
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"path/filepath"
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"strings"
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"github.com/restic/restic/internal/errors"
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)
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// ErrBadString is returned when Match is called with the empty string as the
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// second argument.
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var ErrBadString = errors.New("filter.Match: string is empty")
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// Match returns true if str matches the pattern. When the pattern is
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// malformed, filepath.ErrBadPattern is returned. The empty pattern matches
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// everything, when str is the empty string ErrBadString is returned.
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//
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// Pattern can be a combination of patterns suitable for filepath.Match, joined
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// by filepath.Separator.
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func Match(pattern, str string) (matched bool, err error) {
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if pattern == "" {
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return true, nil
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}
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pattern = filepath.Clean(pattern)
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if str == "" {
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return false, ErrBadString
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}
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// convert file path separator to '/'
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if filepath.Separator != '/' {
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pattern = strings.Replace(pattern, string(filepath.Separator), "/", -1)
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str = strings.Replace(str, string(filepath.Separator), "/", -1)
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}
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patterns := strings.Split(pattern, "/")
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strs := strings.Split(str, "/")
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return match(patterns, strs)
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}
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func hasDoubleWildcard(list []string) (ok bool, pos int) {
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for i, item := range list {
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if item == "**" {
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return true, i
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}
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}
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return false, 0
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}
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func match(patterns, strs []string) (matched bool, err error) {
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if ok, pos := hasDoubleWildcard(patterns); ok {
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// gradually expand '**' into separate wildcards
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for i := 0; i <= len(strs)-len(patterns)+1; i++ {
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newPat := make([]string, pos)
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copy(newPat, patterns[:pos])
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for k := 0; k < i; k++ {
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newPat = append(newPat, "*")
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}
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newPat = append(newPat, patterns[pos+1:]...)
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matched, err := match(newPat, strs)
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if err != nil {
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return false, err
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}
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if matched {
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return true, nil
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}
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}
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return false, nil
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}
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if len(patterns) == 0 && len(strs) == 0 {
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return true, nil
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}
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if len(patterns) <= len(strs) {
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outer:
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for offset := len(strs) - len(patterns); offset >= 0; offset-- {
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for i := len(patterns) - 1; i >= 0; i-- {
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ok, err := filepath.Match(patterns[i], strs[offset+i])
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if err != nil {
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return false, errors.Wrap(err, "Match")
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}
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if !ok {
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continue outer
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}
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}
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return true, nil
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}
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}
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return false, nil
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}
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// List returns true if str matches one of the patterns. Empty patterns are
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// ignored.
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func List(patterns []string, str string) (matched bool, err error) {
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for _, pat := range patterns {
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if pat == "" {
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continue
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}
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matched, err = Match(pat, str)
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if err != nil {
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return false, err
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}
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if matched {
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return true, nil
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}
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}
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return false, nil
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}
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