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Diffstat (limited to 'src/pkg/path/match.go')
| -rw-r--r-- | src/pkg/path/match.go | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/src/pkg/path/match.go b/src/pkg/path/match.go deleted file mode 100644 index 8154bf602..000000000 --- a/src/pkg/path/match.go +++ /dev/null @@ -1,209 +0,0 @@ -// Copyright 2010 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package path - -import ( - "errors" - "strings" - "unicode/utf8" -) - -// ErrBadPattern indicates a globbing pattern was malformed. -var ErrBadPattern = errors.New("syntax error in pattern") - -// Match returns true if name matches the shell file name pattern. -// The pattern syntax is: -// -// pattern: -// { term } -// term: -// '*' matches any sequence of non-/ characters -// '?' matches any single non-/ character -// '[' [ '^' ] { character-range } ']' -// character class (must be non-empty) -// c matches character c (c != '*', '?', '\\', '[') -// '\\' c matches character c -// -// character-range: -// c matches character c (c != '\\', '-', ']') -// '\\' c matches character c -// lo '-' hi matches character c for lo <= c <= hi -// -// Match requires pattern to match all of name, not just a substring. -// The only possible returned error is ErrBadPattern, when pattern -// is malformed. -// -func Match(pattern, name string) (matched bool, err error) { -Pattern: - for len(pattern) > 0 { - var star bool - var chunk string - star, chunk, pattern = scanChunk(pattern) - if star && chunk == "" { - // Trailing * matches rest of string unless it has a /. - return strings.Index(name, "/") < 0, nil - } - // Look for match at current position. - t, ok, err := matchChunk(chunk, name) - // if we're the last chunk, make sure we've exhausted the name - // otherwise we'll give a false result even if we could still match - // using the star - if ok && (len(t) == 0 || len(pattern) > 0) { - name = t - continue - } - if err != nil { - return false, err - } - if star { - // Look for match skipping i+1 bytes. - // Cannot skip /. - for i := 0; i < len(name) && name[i] != '/'; i++ { - t, ok, err := matchChunk(chunk, name[i+1:]) - if ok { - // if we're the last chunk, make sure we exhausted the name - if len(pattern) == 0 && len(t) > 0 { - continue - } - name = t - continue Pattern - } - if err != nil { - return false, err - } - } - } - return false, nil - } - return len(name) == 0, nil -} - -// scanChunk gets the next segment of pattern, which is a non-star string -// possibly preceded by a star. -func scanChunk(pattern string) (star bool, chunk, rest string) { - for len(pattern) > 0 && pattern[0] == '*' { - pattern = pattern[1:] - star = true - } - inrange := false - var i int -Scan: - for i = 0; i < len(pattern); i++ { - switch pattern[i] { - case '\\': - // error check handled in matchChunk: bad pattern. - if i+1 < len(pattern) { - i++ - } - case '[': - inrange = true - case ']': - inrange = false - case '*': - if !inrange { - break Scan - } - } - } - return star, pattern[0:i], pattern[i:] -} - -// matchChunk checks whether chunk matches the beginning of s. -// If so, it returns the remainder of s (after the match). -// Chunk is all single-character operators: literals, char classes, and ?. -func matchChunk(chunk, s string) (rest string, ok bool, err error) { - for len(chunk) > 0 { - if len(s) == 0 { - return - } - switch chunk[0] { - case '[': - // character class - r, n := utf8.DecodeRuneInString(s) - s = s[n:] - chunk = chunk[1:] - // possibly negated - notNegated := true - if len(chunk) > 0 && chunk[0] == '^' { - notNegated = false - chunk = chunk[1:] - } - // parse all ranges - match := false - nrange := 0 - for { - if len(chunk) > 0 && chunk[0] == ']' && nrange > 0 { - chunk = chunk[1:] - break - } - var lo, hi rune - if lo, chunk, err = getEsc(chunk); err != nil { - return - } - hi = lo - if chunk[0] == '-' { - if hi, chunk, err = getEsc(chunk[1:]); err != nil { - return - } - } - if lo <= r && r <= hi { - match = true - } - nrange++ - } - if match != notNegated { - return - } - - case '?': - if s[0] == '/' { - return - } - _, n := utf8.DecodeRuneInString(s) - s = s[n:] - chunk = chunk[1:] - - case '\\': - chunk = chunk[1:] - if len(chunk) == 0 { - err = ErrBadPattern - return - } - fallthrough - - default: - if chunk[0] != s[0] { - return - } - s = s[1:] - chunk = chunk[1:] - } - } - return s, true, nil -} - -// getEsc gets a possibly-escaped character from chunk, for a character class. -func getEsc(chunk string) (r rune, nchunk string, err error) { - if len(chunk) == 0 || chunk[0] == '-' || chunk[0] == ']' { - err = ErrBadPattern - return - } - if chunk[0] == '\\' { - chunk = chunk[1:] - if len(chunk) == 0 { - err = ErrBadPattern - return - } - } - r, n := utf8.DecodeRuneInString(chunk) - if r == utf8.RuneError && n == 1 { - err = ErrBadPattern - } - nchunk = chunk[n:] - if len(nchunk) == 0 { - err = ErrBadPattern - } - return -} |