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lib: memoised versions of regexReplace[CI] (#244)

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This commit is contained in:
Simon Michael 2015-09-26 15:45:17 -10:00
parent f8f2d457b9
commit 041541e466
1 changed files with 12 additions and 1 deletions
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13
hledger-lib/Hledger/Utils/Regex.hs
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@ -22,7 +22,8 @@ Easy regular expression helpers, currently based on regex-tdfa. These should:
Regex strings are automatically compiled into regular expressions the
first time they are seen, and these are cached. If you use a huge
number of unique regular expressions this might lead to increased
memory usage.
memory usage. Several functions have memoised variants (*Memo), which
also trade space for time.
Current limitations:
@ -39,6 +40,8 @@ module Hledger.Utils.Regex (
,regexMatchesCI
,regexReplace
,regexReplaceCI
,regexReplaceMemo
,regexReplaceCIMemo
,regexReplaceBy
,regexReplaceByCI
)
@ -102,6 +105,14 @@ regexReplace re = replaceRegex (toRegex re)
regexReplaceCI :: Regexp -> Replacement -> String -> String
regexReplaceCI re = replaceRegex (toRegexCI re)
-- | A memoising version of regexReplace. Caches the result for each
-- search pattern, replacement pattern, target string tuple.
regexReplaceMemo :: Regexp -> Replacement -> String -> String
regexReplaceMemo re repl = memo (regexReplace re repl)
regexReplaceCIMemo :: Regexp -> Replacement -> String -> String
regexReplaceCIMemo re repl = memo (regexReplaceCI re repl)
--
replaceRegex :: Regex -> Replacement -> String -> String