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|
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Readers.Docx.Fields
Copyright : Copyright (C) 2014-2020 Jesse Rosenthal
License : GNU GPL, version 2 or above
Maintainer : Jesse Rosenthal <jrosenthal@jhu.edu>
Stability : alpha
Portability : portable
For parsing Field definitions in instText tags, as described in
ECMA-376-1:2016, §17.16.5 -}
module Text.Pandoc.Readers.Docx.Fields ( FieldInfo(..)
, parseFieldInfo
) where
import Data.Functor (($>), void)
import qualified Data.Text as T
import Text.Parsec
import Text.Parsec.Text (Parser)
type URL = T.Text
type Anchor = T.Text
data FieldInfo = HyperlinkField URL
-- The boolean indicates whether the field is a hyperlink.
| PagerefField Anchor Bool
| UnknownField
deriving (Show)
parseFieldInfo :: T.Text -> Either ParseError FieldInfo
parseFieldInfo = parse fieldInfo ""
fieldInfo :: Parser FieldInfo
fieldInfo =
try (HyperlinkField <$> hyperlink)
<|>
try ((uncurry PagerefField) <$> pageref)
<|>
return UnknownField
escapedQuote :: Parser T.Text
escapedQuote = string "\\\"" $> "\\\""
inQuotes :: Parser T.Text
inQuotes =
try escapedQuote <|> (T.singleton <$> anyChar)
quotedString :: Parser T.Text
quotedString = do
char '"'
T.concat <$> manyTill inQuotes (try (char '"'))
unquotedString :: Parser T.Text
unquotedString = T.pack <$> manyTill anyChar (try $ void (lookAhead space) <|> eof)
fieldArgument :: Parser T.Text
fieldArgument = quotedString <|> unquotedString
-- there are other switches, but this is the only one I've seen in the wild so far, so it's the first one I'll implement. See §17.16.5.25
hyperlinkSwitch :: Parser (T.Text, T.Text)
hyperlinkSwitch = do
sw <- string "\\l"
spaces
farg <- fieldArgument
return (T.pack sw, farg)
hyperlink :: Parser URL
hyperlink = do
many space
string "HYPERLINK"
spaces
farg <- fieldArgument
switches <- spaces *> many hyperlinkSwitch
let url = case switches of
("\\l", s) : _ -> farg <> "#" <> s
_ -> farg
return url
-- See §17.16.5.45
pagerefSwitch :: Parser (T.Text, T.Text)
pagerefSwitch = do
sw <- string "\\h"
spaces
farg <- fieldArgument
return (T.pack sw, farg)
pageref :: Parser (Anchor, Bool)
pageref = do
many space
string "PAGEREF"
spaces
farg <- fieldArgument
switches <- spaces *> many pagerefSwitch
let isLink = case switches of
("\\h", _) : _ -> True
_ -> False
return (farg, isLink)
|
