Re: [Haskell-cafe] Searching of several substrings (with Data.Text ?)

I've been looking into building parsers at runtime (from a config file), and in my case it's beneficial to fit them into the context of a larger parser with Attoparsec.Text. This code is untested for practical use so I doubt you'll see comparable performance to the aforementioned regex packages, but it could be worth exploring if you need to mix and match parsers or if the definitions can change arbitrarily at runtime. import qualified Data.Text as T import Data.Attoparsec.Text import Control.Applicative ((<|>)) parseLigature x = string (T.pack x) charToText = do c <- anyChar return (T.singleton c) buildChain [x] = parseLigature x buildChain (x:xs) = try (parseLigature x) <|> buildChain xs -- ordering matters here, so "ffi" comes before "ff" or "fi" ligatures = buildChain ["ffi", "th", "ff", "fi", "fl"] myParser = many (try ligatures <|> charToText) -- at ghci prompt: parseOnly myParser (T.pack "the fluffiest bunny") -- Right ["th","e"," ","fl","u","ffi","e","s","t"," ","b","u","n","n","y"] On Tue, Jul 5, 2011 at 12:09 PM, Bryan O'Sullivan wrote:

On Tue, Jul 5, 2011 at 11:01 AM, Tillmann Vogt wrote:

...

I looked at Data.Text http://hackage.haskell.org/packages/archive/text/0.5/doc/html/Data-Text.html and http://hackage.haskell.org/packages/archive/stringsearch/0.3.3/doc/html/Data...

but they don't have a function that can search several substrings in one run.

Here's what you want: http://hackage.haskell.org/packages/archive/text-icu/0.6.3.4/doc/html/Data-T... _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe