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author | Jasper Van der Jeugt <jaspervdj@gmail.com> | 2011-02-28 22:33:28 +0100 |
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committer | Jasper Van der Jeugt <jaspervdj@gmail.com> | 2011-02-28 22:33:28 +0100 |
commit | 49989eab5767b24cb3e917b95137ae05566e34a8 (patch) | |
tree | 30a7cde43237c89660511129106ac0b5c87504ac /src/Hakyll/Core/Util/String.hs | |
parent | c355b047db5dfb479c83c13474f02cb83fe83e96 (diff) | |
download | hakyll-49989eab5767b24cb3e917b95137ae05566e34a8.tar.gz |
Web.Util.String → {Web.Util.Url, Core.Util.String}
Diffstat (limited to 'src/Hakyll/Core/Util/String.hs')
-rw-r--r-- | src/Hakyll/Core/Util/String.hs | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/Hakyll/Core/Util/String.hs b/src/Hakyll/Core/Util/String.hs new file mode 100644 index 0000000..7f75a36 --- /dev/null +++ b/src/Hakyll/Core/Util/String.hs @@ -0,0 +1,48 @@ +-- | Miscellaneous string manipulation functions. +-- +module Hakyll.Core.Util.String + ( trim + , replaceAll + , splitAll + ) where + +import Data.Char (isSpace) +import Data.Maybe (listToMaybe) + +import Text.Regex.PCRE ((=~~)) + +-- | Trim a string (drop spaces, tabs and newlines at both sides). +-- +trim :: String -> String +trim = reverse . trim' . reverse . trim' + where + trim' = dropWhile isSpace + +-- | A simple (but inefficient) regex replace funcion +-- +replaceAll :: String -- ^ Pattern + -> (String -> String) -- ^ Replacement (called on capture) + -> String -- ^ Source string + -> String -- ^ Result +replaceAll pattern f source = replaceAll' source + where + replaceAll' src = case listToMaybe (src =~~ pattern) of + Nothing -> src + Just (o, l) -> + let (before, tmp) = splitAt o src + (capture, after) = splitAt l tmp + in before ++ f capture ++ replaceAll' after + +-- | A simple regex split function. The resulting list will contain no empty +-- strings. +-- +splitAll :: String -- ^ Pattern + -> String -- ^ String to split + -> [String] -- ^ Result +splitAll pattern = filter (not . null) . splitAll' + where + splitAll' src = case listToMaybe (src =~~ pattern) of + Nothing -> [src] + Just (o, l) -> + let (before, tmp) = splitAt o src + in before : splitAll' (drop l tmp) |