src/Textphile/TCT/Read/Elem.hs

   1 {-# LANGUAGE FlexibleContexts #-}
   2 {-# LANGUAGE OverloadedStrings #-}
   3 {-# LANGUAGE Rank2Types #-}
   4 {-# LANGUAGE TypeFamilies #-}
   5 module Textphile.TCT.Read.Elem where
   6
   7 import Control.Applicative (Applicative(..), Alternative(..))
   8 import Control.Monad (Monad(..))
   9 import Data.Bool
  10 import Data.Char (Char)
  11 import Data.Eq (Eq(..))
  12 import Data.Function (($), (.))
  13 import Data.Functor ((<$>), (<$))
  14 import Data.Maybe (Maybe(..))
  15 import Data.Semigroup (Semigroup(..))
  16 import qualified Data.Char as Char
  17 import qualified Data.Char.Properties.XMLCharProps as XC
  18 import qualified Data.Text.Lazy as TL
  19 import qualified Symantic.XML as XML
  20 import qualified Text.Megaparsec as P
  21 import qualified Text.Megaparsec.Char as P
  22
  23 import Textphile.TCT.Debug
  24 import Textphile.TCT.Elem
  25 import Textphile.TCT.Tree
  26 import Textphile.TCT.Read.Cell
  27
  28 -- * Word
  29 p_Spaces :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  30 p_Spaces = P.takeWhileP (Just "Space") Char.isSpace
  31 p_Spaces1 :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  32 p_Spaces1 = P.takeWhile1P (Just "Space") Char.isSpace
  33 p_HSpaces :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  34 p_HSpaces = P.takeWhileP (Just "HSpace") (==' ')
  35 p_Digits :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  36 p_Digits = P.takeWhileP (Just "Digit") Char.isDigit
  37 p_Digits1 :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  38 p_Digits1 = P.takeWhile1P (Just "Digit1") Char.isDigit
  39 p_AlphaNums :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  40 p_AlphaNums = P.takeWhileP (Just "AlphaNum") Char.isAlphaNum
  41 p_AlphaNums1 :: P.Tokens s ~ TL.Text => Parser e s TL.Text
  42 p_AlphaNums1 = P.takeWhile1P (Just "AlphaNum1") Char.isAlphaNum
  43 {-
  44 -- NOTE: could be done with TL.Text, which has a less greedy (<>).
  45 p_Word :: Parser e Text Text
  46 p_Word = debugParser "Word" $ P.try p_take <|> p_copy
  47         where
  48         p_take = do
  49                 P.notFollowedBy $ P.satisfy $ not . Char.isAlphaNum
  50                 w <- P.takeWhile1P (Just "Word") $ \c ->
  51                         Char.isAlphaNum c ||
  52                         c == '_' ||
  53                         c == '-'
  54                 guard $ Char.isAlphaNum $ Text.last w
  55                 return w
  56         p_copy =
  57                 (<>)
  58                  <$> p_AlphaNums1
  59                  <*> P.option "" (P.try $
  60                         (<>)
  61                          <$> ((Text.pack <$>) $ P.some $ P.char '_' <|> P.char '-')
  62                          <*> p_copy)
  63 -}
  64
  65 -- * Elem
  66 p_ElemSingle :: P.Tokens s ~ TL.Text => Parser e s Pair
  67 p_ElemSingle = debugParser "ElemSingle" $
  68         PairElem
  69          <$  P.char '<'
  70          <*> p_ElemName
  71          <*> p_ElemAttrs
  72          <*  P.string "/>"
  73
  74 p_ElemOpen :: P.Tokens s ~ TL.Text => Parser e s Pair
  75 p_ElemOpen = debugParser "ElemOpen" $
  76         PairElem
  77          <$  P.char '<'
  78          <*> p_ElemName
  79          <*> p_ElemAttrs
  80          <*  P.char '>'
  81
  82 p_ElemName :: P.Tokens s ~ TL.Text => Parser e s ElemName
  83 p_ElemName = P.label "NCName" $
  84         XML.NCName
  85          <$  P.notFollowedBy (P.satisfy $ not . XC.isXmlNCNameStartChar)
  86          <*> P.takeWhile1P Nothing XC.isXmlNCNameChar
  87  -- TODO: namespace
  88
  89 p_ElemClose :: P.Tokens s ~ TL.Text => Parser e s Pair
  90 p_ElemClose = debugParser "ElemClose" $
  91         (`PairElem` [])
  92          <$  P.string "</"
  93          <*> p_ElemName
  94          <*  P.char '>'
  95
  96 {-
  97 p_ElemOpenOrSingle :: Parser e Text Pair
  98 p_ElemOpenOrSingle =
  99         p_ElemOpen >>= \p ->
 100                 P.char    '>' $> LexemePairOpen p <|>
 101                 P.string "/>" $> LexemePairAny  p
 102 -}
 103
 104 -- * 'ElemAttr'
 105 p_ElemAttrs :: P.Tokens s ~ TL.Text => Parser e s [(White,ElemAttr)]
 106 p_ElemAttrs = P.many $ P.try $ (,) <$> p_Spaces <*> p_ElemAttr
 107 p_ElemAttr :: P.Tokens s ~ TL.Text => Parser e s ElemAttr
 108 p_ElemAttr = P.try p_ElemAttrEq <|> p_ElemAttrName
 109
 110 p_ElemAttrEq :: P.Tokens s ~ TL.Text => Parser e s ElemAttr
 111 p_ElemAttrEq =
 112         (\n (o,v,c) -> ElemAttr n ("="<>o) v c)
 113          <$> p_ElemName
 114          <*  P.char '='
 115          <*> p_ElemAttrValue
 116 p_ElemAttrName :: P.Tokens s ~ TL.Text => Parser e s ElemAttr
 117 p_ElemAttrName =
 118         (\n -> ElemAttr n "" "" "")
 119          <$> p_ElemName
 120
 121 p_ElemAttrValue :: P.Tokens s ~ TL.Text => Parser e s (TL.Text,TL.Text,TL.Text)
 122 p_ElemAttrValue =
 123         p_ElemAttrValueQuote '\'' <|>
 124         p_ElemAttrValueQuote '"'  <|>
 125         p_ElemAttrValueWord
 126
 127 p_ElemAttrValueQuote :: Char -> P.Tokens s ~ TL.Text => Parser e s (TL.Text,TL.Text,TL.Text)
 128 p_ElemAttrValueQuote q =
 129         (\o v c -> (TL.singleton o, v, TL.singleton c))
 130          <$> P.char q
 131          <*> P.takeWhile1P (Just "ElemAttrValueQuoted") (/=q)
 132          <*> P.char q
 133 p_ElemAttrValueWord :: P.Tokens s ~ TL.Text => Parser e s (TL.Text,TL.Text,TL.Text)
 134 p_ElemAttrValueWord = do
 135         w <- P.takeWhile1P (Just "ElemAttrValueWord") $ \c ->
 136                 Char.isPrint c &&
 137                 not (Char.isSpace c) &&
 138                 c /= '\'' &&
 139                 c /= '"' &&
 140                 c /= '=' &&
 141                 c /= '/' &&
 142                 c /= '<' &&
 143                 c /= '>'
 144         return ("",w,"")