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glob.go
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glob.go
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// rsync style glob parser
package filter
import (
"bytes"
"regexp"
"strings"
"github.com/pkg/errors"
)
// globToRegexp converts an rsync style glob to a regexp
//
// documented in filtering.md
func globToRegexp(glob string, ignoreCase bool) (*regexp.Regexp, error) {
var re bytes.Buffer
if ignoreCase {
_, _ = re.WriteString("(?i)")
}
if strings.HasPrefix(glob, "/") {
glob = glob[1:]
_, _ = re.WriteRune('^')
} else {
_, _ = re.WriteString("(^|/)")
}
consecutiveStars := 0
insertStars := func() error {
if consecutiveStars > 0 {
switch consecutiveStars {
case 1:
_, _ = re.WriteString(`[^/]*`)
case 2:
_, _ = re.WriteString(`.*`)
default:
return errors.Errorf("too many stars in %q", glob)
}
}
consecutiveStars = 0
return nil
}
inBraces := false
inBrackets := 0
slashed := false
for _, c := range glob {
if slashed {
_, _ = re.WriteRune(c)
slashed = false
continue
}
if c != '*' {
err := insertStars()
if err != nil {
return nil, err
}
}
if inBrackets > 0 {
_, _ = re.WriteRune(c)
if c == '[' {
inBrackets++
}
if c == ']' {
inBrackets--
}
continue
}
switch c {
case '\\':
_, _ = re.WriteRune(c)
slashed = true
case '*':
consecutiveStars++
case '?':
_, _ = re.WriteString(`[^/]`)
case '[':
_, _ = re.WriteRune(c)
inBrackets++
case ']':
return nil, errors.Errorf("mismatched ']' in glob %q", glob)
case '{':
if inBraces {
return nil, errors.Errorf("can't nest '{' '}' in glob %q", glob)
}
inBraces = true
_, _ = re.WriteRune('(')
case '}':
if !inBraces {
return nil, errors.Errorf("mismatched '{' and '}' in glob %q", glob)
}
_, _ = re.WriteRune(')')
inBraces = false
case ',':
if inBraces {
_, _ = re.WriteRune('|')
} else {
_, _ = re.WriteRune(c)
}
case '.', '+', '(', ')', '|', '^', '$': // regexp meta characters not dealt with above
_, _ = re.WriteRune('\\')
_, _ = re.WriteRune(c)
default:
_, _ = re.WriteRune(c)
}
}
err := insertStars()
if err != nil {
return nil, err
}
if inBrackets > 0 {
return nil, errors.Errorf("mismatched '[' and ']' in glob %q", glob)
}
if inBraces {
return nil, errors.Errorf("mismatched '{' and '}' in glob %q", glob)
}
_, _ = re.WriteRune('$')
result, err := regexp.Compile(re.String())
if err != nil {
return nil, errors.Wrapf(err, "bad glob pattern %q (regexp %q)", glob, re.String())
}
return result, nil
}
var (
// Can't deal with / or ** in {}
tooHardRe = regexp.MustCompile(`{[^{}]*(\*\*|/)[^{}]*}`)
// Squash all /
squashSlash = regexp.MustCompile(`/{2,}`)
)
// globToDirGlobs takes a file glob and turns it into a series of
// directory globs. When matched with a directory (with a trailing /)
// this should answer the question as to whether this glob could be in
// this directory.
func globToDirGlobs(glob string) (out []string) {
if tooHardRe.MatchString(glob) {
// Can't figure this one out so return any directory might match
out = append(out, "/**")
return out
}
// Get rid of multiple /s
glob = squashSlash.ReplaceAllString(glob, "/")
// Split on / or **
// (** can contain /)
for {
i := strings.LastIndex(glob, "/")
j := strings.LastIndex(glob, "**")
what := ""
if j > i {
i = j
what = "**"
}
if i < 0 {
if len(out) == 0 {
out = append(out, "/**")
}
break
}
glob = glob[:i]
newGlob := glob + what + "/"
if len(out) == 0 || out[len(out)-1] != newGlob {
out = append(out, newGlob)
}
}
return out
}
// globBoundedRecursion returns true if the glob only needs bounded
// recursion in the file tree to evaluate.
func globBoundedRecursion(glob string) bool {
if strings.Contains(glob, "**") {
return false
}
if strings.HasPrefix(glob, "/") {
return true
}
return false
}