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|
{-- snippet type --}
module GlobRegex
(
globToRegex
, matchesGlob
) where
import Text.Regex.Posix ((=~))
globToRegex :: String -> String
{-- /snippet type --}
{-- snippet rooted --}
globToRegex cs = '^' : globToRegex' cs ++ "$"
{-- /snippet rooted --}
{-- snippet asterisk --}
globToRegex' :: String -> String
globToRegex' "" = ""
globToRegex' ('*':cs) = ".*" ++ globToRegex' cs
globToRegex' ('?':cs) = '.' : globToRegex' cs
globToRegex' ('[':'!':c:cs) = "[^" ++ c : charClass cs
globToRegex' ('[':c:cs) = '[' : c : charClass cs
globToRegex' ('[':_) = error "unterminated character class"
globToRegex' (c:cs) = escape c ++ globToRegex' cs
{-- /snippet asterisk --}
{-
{-- snippet last --}
globToRegex' (c:cs) = escape c ++ globToRegex' cs
{-- /snippet last --}
-}
{-- snippet escape --}
escape :: Char -> String
escape c | c `elem` regexChars = '\\' : [c]
| otherwise = [c]
where regexChars = "\\+()^$.{}]|"
{-- /snippet escape --}
{-- snippet charClass --}
charClass :: String -> String
charClass (']':cs) = ']' : globToRegex' cs
charClass (c:cs) = c : charClass cs
charClass [] = error "unterminated character class"
{-- /snippet charClass --}
{-- snippet matchesGlob --}
matchesGlob :: FilePath -> String -> Bool
name `matchesGlob` pat = name =~ globToRegex pat
{-- /snippet matchesGlob --}
|
