mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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381 lines
11 KiB
Go
381 lines
11 KiB
Go
package doublestar
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import (
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"path/filepath"
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"unicode/utf8"
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)
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// Match reports whether name matches the shell pattern.
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// The pattern syntax is:
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//
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// pattern:
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// { term }
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// term:
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// '*' matches any sequence of non-path-separators
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// '/**/' matches zero or more directories
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// '?' matches any single non-path-separator character
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// '[' [ '^' '!' ] { character-range } ']'
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// character class (must be non-empty)
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// starting with `^` or `!` negates the class
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// '{' { term } [ ',' { term } ... ] '}'
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// alternatives
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// c matches character c (c != '*', '?', '\\', '[')
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// '\\' c matches character c
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//
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// character-range:
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// c matches character c (c != '\\', '-', ']')
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// '\\' c matches character c
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// lo '-' hi matches character c for lo <= c <= hi
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//
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// Match returns true if `name` matches the file name `pattern`. `name` and
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// `pattern` are split on forward slash (`/`) characters and may be relative or
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// absolute.
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//
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// Match requires pattern to match all of name, not just a substring.
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// The only possible returned error is ErrBadPattern, when pattern
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// is malformed.
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//
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// A doublestar (`**`) should appear surrounded by path separators such as
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// `/**/`. A mid-pattern doublestar (`**`) behaves like bash's globstar
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// option: a pattern such as `path/to/**.txt` would return the same results as
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// `path/to/*.txt`. The pattern you're looking for is `path/to/**/*.txt`.
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//
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// Note: this is meant as a drop-in replacement for path.Match() which
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// always uses '/' as the path separator. If you want to support systems
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// which use a different path separator (such as Windows), what you want
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// is PathMatch(). Alternatively, you can run filepath.ToSlash() on both
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// pattern and name and then use this function.
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//
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// Note: users should _not_ count on the returned error,
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// doublestar.ErrBadPattern, being equal to path.ErrBadPattern.
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//
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func Match(pattern, name string) (bool, error) {
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return matchWithSeparator(pattern, name, '/', true)
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}
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// PathMatch returns true if `name` matches the file name `pattern`. The
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// difference between Match and PathMatch is that PathMatch will automatically
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// use your system's path separator to split `name` and `pattern`. On systems
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// where the path separator is `'\'`, escaping will be disabled.
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//
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// Note: this is meant as a drop-in replacement for filepath.Match(). It
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// assumes that both `pattern` and `name` are using the system's path
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// separator. If you can't be sure of that, use filepath.ToSlash() on both
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// `pattern` and `name`, and then use the Match() function instead.
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//
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func PathMatch(pattern, name string) (bool, error) {
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return matchWithSeparator(pattern, name, filepath.Separator, true)
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}
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func matchWithSeparator(pattern, name string, separator rune, validate bool) (matched bool, err error) {
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return doMatchWithSeparator(pattern, name, separator, validate, -1, -1, -1, -1, 0, 0)
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}
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func doMatchWithSeparator(pattern, name string, separator rune, validate bool, doublestarPatternBacktrack, doublestarNameBacktrack, starPatternBacktrack, starNameBacktrack, patIdx, nameIdx int) (matched bool, err error) {
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patLen := len(pattern)
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nameLen := len(name)
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startOfSegment := true
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MATCH:
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for nameIdx < nameLen {
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if patIdx < patLen {
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switch pattern[patIdx] {
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case '*':
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if patIdx++; patIdx < patLen && pattern[patIdx] == '*' {
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// doublestar - must begin with a path separator, otherwise we'll
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// treat it like a single star like bash
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patIdx++
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if startOfSegment {
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if patIdx >= patLen {
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// pattern ends in `/**`: return true
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return true, nil
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}
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// doublestar must also end with a path separator, otherwise we're
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// just going to treat the doublestar as a single star like bash
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patRune, patRuneLen := utf8.DecodeRuneInString(pattern[patIdx:])
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if patRune == separator {
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patIdx += patRuneLen
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doublestarPatternBacktrack = patIdx
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doublestarNameBacktrack = nameIdx
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starPatternBacktrack = -1
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starNameBacktrack = -1
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continue
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}
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}
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}
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startOfSegment = false
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starPatternBacktrack = patIdx
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starNameBacktrack = nameIdx
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continue
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case '?':
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startOfSegment = false
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nameRune, nameRuneLen := utf8.DecodeRuneInString(name[nameIdx:])
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if nameRune == separator {
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// `?` cannot match the separator
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break
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}
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patIdx++
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nameIdx += nameRuneLen
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continue
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case '[':
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startOfSegment = false
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if patIdx++; patIdx >= patLen {
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// class didn't end
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return false, ErrBadPattern
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}
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nameRune, nameRuneLen := utf8.DecodeRuneInString(name[nameIdx:])
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matched := false
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negate := pattern[patIdx] == '!' || pattern[patIdx] == '^'
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if negate {
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patIdx++
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}
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if patIdx >= patLen || pattern[patIdx] == ']' {
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// class didn't end or empty character class
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return false, ErrBadPattern
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}
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last := utf8.MaxRune
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for patIdx < patLen && pattern[patIdx] != ']' {
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patRune, patRuneLen := utf8.DecodeRuneInString(pattern[patIdx:])
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patIdx += patRuneLen
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// match a range
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if last < utf8.MaxRune && patRune == '-' && patIdx < patLen && pattern[patIdx] != ']' {
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if pattern[patIdx] == '\\' {
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// next character is escaped
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patIdx++
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}
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patRune, patRuneLen = utf8.DecodeRuneInString(pattern[patIdx:])
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patIdx += patRuneLen
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if last <= nameRune && nameRune <= patRune {
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matched = true
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break
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}
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// didn't match range - reset `last`
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last = utf8.MaxRune
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continue
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}
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// not a range - check if the next rune is escaped
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if patRune == '\\' {
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patRune, patRuneLen = utf8.DecodeRuneInString(pattern[patIdx:])
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patIdx += patRuneLen
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}
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// check if the rune matches
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if patRune == nameRune {
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matched = true
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break
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}
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// no matches yet
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last = patRune
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}
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if matched == negate {
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// failed to match - if we reached the end of the pattern, that means
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// we never found a closing `]`
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if patIdx >= patLen {
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return false, ErrBadPattern
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}
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break
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}
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closingIdx := indexUnescapedByte(pattern[patIdx:], ']', true)
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if closingIdx == -1 {
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// no closing `]`
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return false, ErrBadPattern
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}
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patIdx += closingIdx + 1
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nameIdx += nameRuneLen
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continue
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case '{':
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startOfSegment = false
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beforeIdx := patIdx
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patIdx++
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closingIdx := indexMatchedClosingAlt(pattern[patIdx:], separator != '\\')
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if closingIdx == -1 {
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// no closing `}`
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return false, ErrBadPattern
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}
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closingIdx += patIdx
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for {
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commaIdx := indexNextAlt(pattern[patIdx:closingIdx], separator != '\\')
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if commaIdx == -1 {
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break
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}
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commaIdx += patIdx
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result, err := doMatchWithSeparator(pattern[:beforeIdx]+pattern[patIdx:commaIdx]+pattern[closingIdx+1:], name, separator, validate, doublestarPatternBacktrack, doublestarNameBacktrack, starPatternBacktrack, starNameBacktrack, beforeIdx, nameIdx)
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if result || err != nil {
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return result, err
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}
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patIdx = commaIdx + 1
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}
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return doMatchWithSeparator(pattern[:beforeIdx]+pattern[patIdx:closingIdx]+pattern[closingIdx+1:], name, separator, validate, doublestarPatternBacktrack, doublestarNameBacktrack, starPatternBacktrack, starNameBacktrack, beforeIdx, nameIdx)
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case '\\':
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if separator != '\\' {
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// next rune is "escaped" in the pattern - literal match
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if patIdx++; patIdx >= patLen {
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// pattern ended
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return false, ErrBadPattern
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}
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}
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fallthrough
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default:
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patRune, patRuneLen := utf8.DecodeRuneInString(pattern[patIdx:])
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nameRune, nameRuneLen := utf8.DecodeRuneInString(name[nameIdx:])
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if patRune != nameRune {
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if separator != '\\' && patIdx > 0 && pattern[patIdx-1] == '\\' {
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// if this rune was meant to be escaped, we need to move patIdx
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// back to the backslash before backtracking or validating below
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patIdx--
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}
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break
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}
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patIdx += patRuneLen
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nameIdx += nameRuneLen
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startOfSegment = patRune == separator
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continue
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}
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}
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if starPatternBacktrack >= 0 {
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// `*` backtrack, but only if the `name` rune isn't the separator
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nameRune, nameRuneLen := utf8.DecodeRuneInString(name[starNameBacktrack:])
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if nameRune != separator {
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starNameBacktrack += nameRuneLen
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patIdx = starPatternBacktrack
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nameIdx = starNameBacktrack
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startOfSegment = false
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continue
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}
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}
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if doublestarPatternBacktrack >= 0 {
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// `**` backtrack, advance `name` past next separator
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nameIdx = doublestarNameBacktrack
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for nameIdx < nameLen {
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nameRune, nameRuneLen := utf8.DecodeRuneInString(name[nameIdx:])
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nameIdx += nameRuneLen
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if nameRune == separator {
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doublestarNameBacktrack = nameIdx
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patIdx = doublestarPatternBacktrack
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startOfSegment = true
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continue MATCH
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}
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}
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}
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if validate && patIdx < patLen && !doValidatePattern(pattern[patIdx:], separator) {
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return false, ErrBadPattern
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}
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return false, nil
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}
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if nameIdx < nameLen {
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// we reached the end of `pattern` before the end of `name`
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return false, nil
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}
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// we've reached the end of `name`; we've successfully matched if we've also
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// reached the end of `pattern`, or if the rest of `pattern` can match a
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// zero-length string
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return isZeroLengthPattern(pattern[patIdx:], separator)
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}
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func isZeroLengthPattern(pattern string, separator rune) (ret bool, err error) {
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// `/**`, `**/`, and `/**/` are special cases - a pattern such as `path/to/a/**` or `path/to/a/**/`
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// *should* match `path/to/a` because `a` might be a directory
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if pattern == "" ||
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pattern == "*" ||
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pattern == "**" ||
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pattern == string(separator)+"**" ||
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pattern == "**"+string(separator) ||
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pattern == string(separator)+"**"+string(separator) {
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return true, nil
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}
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if pattern[0] == '{' {
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closingIdx := indexMatchedClosingAlt(pattern[1:], separator != '\\')
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if closingIdx == -1 {
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// no closing '}'
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return false, ErrBadPattern
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}
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closingIdx += 1
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patIdx := 1
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for {
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commaIdx := indexNextAlt(pattern[patIdx:closingIdx], separator != '\\')
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if commaIdx == -1 {
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break
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}
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commaIdx += patIdx
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ret, err = isZeroLengthPattern(pattern[patIdx:commaIdx]+pattern[closingIdx+1:], separator)
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if ret || err != nil {
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return
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}
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patIdx = commaIdx + 1
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}
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return isZeroLengthPattern(pattern[patIdx:closingIdx]+pattern[closingIdx+1:], separator)
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}
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// no luck - validate the rest of the pattern
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if !doValidatePattern(pattern, separator) {
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return false, ErrBadPattern
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}
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return false, nil
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}
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// Finds the index of the first unescaped byte `c`, or negative 1.
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func indexUnescapedByte(s string, c byte, allowEscaping bool) int {
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l := len(s)
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for i := 0; i < l; i++ {
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if allowEscaping && s[i] == '\\' {
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// skip next byte
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i++
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} else if s[i] == c {
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return i
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}
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}
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return -1
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}
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// Assuming the byte before the beginning of `s` is an opening `{`, this
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// function will find the index of the matching `}`. That is, it'll skip over
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// any nested `{}` and account for escaping
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func indexMatchedClosingAlt(s string, allowEscaping bool) int {
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alts := 1
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l := len(s)
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for i := 0; i < l; i++ {
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if allowEscaping && s[i] == '\\' {
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// skip next byte
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i++
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} else if s[i] == '{' {
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alts++
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} else if s[i] == '}' {
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if alts--; alts == 0 {
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return i
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}
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}
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}
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return -1
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}
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