From 005dc408dc09c3b479398ebe3e92efa2cd54846e Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 17 Oct 2015 02:26:25 +0200
Subject: Working prototype

---
 bbcode/src/BBCode/Tokenizer.hs | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 bbcode/src/BBCode/Tokenizer.hs

(limited to 'bbcode/src/BBCode/Tokenizer.hs')

diff --git a/bbcode/src/BBCode/Tokenizer.hs b/bbcode/src/BBCode/Tokenizer.hs
new file mode 100644
index 0000000..c860c7c
--- /dev/null
+++ b/bbcode/src/BBCode/Tokenizer.hs
@@ -0,0 +1,44 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module BBCode.Tokenizer
+       ( Token(..)
+       , tokenize
+       ) where
+
+import qualified Data.Text.Lazy as TL
+import qualified Data.Text as T
+
+import Control.Applicative
+import Data.Attoparsec.Text.Lazy
+
+import Data.Char (isSpace)
+import Data.Monoid (mconcat)
+
+data Token = Text String
+           | Whitespace String
+           | TagOpen String
+           | TagClose String
+           deriving (Show, Read, Eq)
+
+tokenize :: String -> Either String [Token]
+tokenize = eitherResult . parse (tokenize' <* endOfInput) . TL.pack
+
+tokenize' :: Parser [Token]
+tokenize' = many $ choice [ whitespace
+                          , Text . T.unpack <$> ("\\" *> "[")
+                          , tagClose
+                          , tagOpen
+                          , text
+                          ]
+
+whitespace :: Parser Token
+whitespace = Whitespace <$> many1 space
+
+tagOpen :: Parser Token
+tagOpen = TagOpen . T.unpack <$> ("[" *> takeWhile1 (/= ']') <* "]")
+
+tagClose :: Parser Token
+tagClose = TagClose . T.unpack <$> ("[/" *> takeWhile1 (/= ']') <* "]")
+
+text :: Parser Token
+text = Text . T.unpack <$> takeWhile1 (\c -> not (isSpace c) && notInClass "[" c)
-- 
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