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TeX.hs
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TeX.hs
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{-# LANGUAGE TupleSections #-}
{-
Copyright (C) 2009 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- | Functions for parsing a LaTeX formula to a Haskell representation.
-}
module Text.TeXMath.Readers.TeX (readTeX)
where
import Data.List (intercalate)
import Control.Monad
import Data.Char (isDigit, isAscii, isLetter)
import qualified Data.Map as M
import Text.Parsec hiding (label)
import Text.Parsec.Error
import Text.Parsec.String
import Text.TeXMath.Types
import Control.Applicative ((<*), (*>), (<*>), (<$>), (<$), pure)
import qualified Text.TeXMath.Shared as S
import Text.TeXMath.Readers.TeX.Macros (applyMacros, parseMacroDefinitions)
import Text.TeXMath.Unicode.ToTeX (getSymbolType)
import Data.Maybe (fromMaybe, fromJust)
type TP = Parser
-- The parser
expr1 :: TP Exp
expr1 = choice
[ inbraces
, variable
, number
, text
, styled
, root
, mspace
, phantom
, boxed
, binary
, genfrac
, substack
, bareSubSup
, environment
, diacritical
, unicode
, ensuremath
, enclosure
, texSymbol
] <* ignorable
-- | Parse a formula, returning a list of 'Exp'.
readTeX :: String -> Either String [Exp]
readTeX inp =
let (ms, rest) = parseMacroDefinitions inp in
either (Left . showParseError inp) (Right . id)
$ parse formula "formula" (applyMacros ms rest)
showParseError :: String -> ParseError -> String
showParseError inp pe =
snippet ++ "\n" ++ caretline ++
showErrorMessages "or" "unknown" "expecting" "unexpected" "eof"
(errorMessages pe)
where errln = sourceLine (errorPos pe)
errcol = sourceColumn (errorPos pe)
snipoffset = max 0 (errcol - 20)
inplns = lines inp
ln = if length inplns >= errln
then inplns !! (errln - 1)
else "" -- should not happen
snippet = take 40 $ drop snipoffset ln
caretline = replicate (errcol - snipoffset - 1) ' ' ++ "^"
ctrlseq :: String -> TP String
ctrlseq s = lexeme $ try $ do
result <- string ('\\':s)
case s of
[c] | not (isLetter c) -> return ()
_ -> (do pos <- getPosition
letter
setPosition pos
mzero <?> ("non-letter after \\" ++ s))
<|> return ()
return result
ignorable :: TP ()
ignorable = skipMany (comment <|> label <|> (skipMany1 space <?> "whitespace"))
comment :: TP ()
comment = char '%' *> skipMany (noneOf "\n") *> optional newline
label :: TP ()
label = ctrlseq "label" *> braces (skipMany (noneOf "}"))
unGrouped :: Exp -> [Exp]
unGrouped (EGrouped xs) = xs
unGrouped x = [x]
formula :: TP [Exp]
formula = unGrouped <$> (ignorable *> manyExp expr <* eof)
expr :: TP Exp
expr = do
optional (ctrlseq "displaystyle")
(a, convertible) <- try (braces operatorname) -- needed because macros add {}
<|> ((,False) <$> expr1)
<|> operatorname
limits <- limitsIndicator
subSup limits convertible a <|> superOrSubscripted limits convertible a <|> return a
-- | Parser for \operatorname command.
-- Returns a tuple of EMathOperator name and Bool depending on the flavor
-- of the command:
--
-- - True for convertible operator (\operator*)
--
-- - False otherwise
operatorname :: TP (Exp, Bool)
operatorname = do
ctrlseq "operatorname"
convertible <- (char '*' >> spaces >> return True) <|> return False
op <- expToOperatorName <$> texToken
maybe mzero (\s -> return (EMathOperator s, convertible)) op
-- | Converts identifiers, symbols and numbers to a flat string.
-- Returns Nothing if the expression contains anything else.
expToOperatorName :: Exp -> Maybe String
expToOperatorName e = case e of
EGrouped xs -> concat <$> mapM fl xs
_ -> fl e
where fl f = case f of
EIdentifier s -> Just s
-- handle special characters
ESymbol _ "\x2212" -> Just "-"
ESymbol _ "\x2032" -> Just "'"
ESymbol _ "\x2033" -> Just "''"
ESymbol _ "\x2034" -> Just "'''"
ESymbol _ "\x2057" -> Just "''''"
ESymbol _ "\x02B9" -> Just "'"
ESymbol _ s -> Just s
ENumber s -> Just s
_ -> Nothing
bareSubSup :: TP Exp
bareSubSup = subSup Nothing False (EIdentifier "")
<|> superOrSubscripted Nothing False (EIdentifier "")
limitsIndicator :: TP (Maybe Bool)
limitsIndicator =
(ctrlseq "limits" >> return (Just True))
<|> (ctrlseq "nolimits" >> return (Just False))
<|> return Nothing
binomCmd :: TP String
binomCmd = oneOfCommands (map fst binomCmds)
binomCmds :: [(String, Exp -> Exp -> Exp)]
binomCmds = [ ("\\choose", \x y ->
EDelimited "(" ")" [Right (EFraction NoLineFrac x y)])
, ("\\brack", \x y ->
EDelimited "[" "]" [Right (EFraction NoLineFrac x y)])
, ("\\brace", \x y ->
EDelimited "{" "}" [Right (EFraction NoLineFrac x y)])
, ("\\bangle", \x y ->
EDelimited "\x27E8" "\x27E9" [Right (EFraction NoLineFrac x y)])
]
genfrac :: TP Exp
genfrac = do
ctrlseq "genfrac"
openDelim <- braces $ option '(' ((char '\\' >> oneOf "{}") <|> anyChar)
closeDelim <- braces $ option ')' ((char '\\' >> oneOf "{}") <|> anyChar)
bar <- False <$ try (braces (string "0pt")) <|> True <$ texToken
displayStyle <- True <$ try (braces (char '0')) <|> False <$ texToken
x <- texToken
y <- texToken
let fracType = case (bar, displayStyle) of
(False, _) -> NoLineFrac
(True, True) -> DisplayFrac
_ -> NormalFrac
return $ EDelimited [openDelim] [closeDelim] [Right (EFraction fracType x y)]
substack :: TP Exp
substack = do
ctrlseq "substack"
formulas <- braces $ ignorable >> (manyExp expr) `sepEndBy` endLine
return $ EArray [AlignCenter] $ map (\x -> [[x]]) formulas
asGroup :: [Exp] -> Exp
asGroup [x] = x
asGroup xs = EGrouped xs
-- variant of many that is sensitive to \choose and other such commands
manyExp' :: Bool -> TP Exp -> TP Exp
manyExp' requireNonempty p = do
initial <- if requireNonempty
then many1 (notFollowedBy binomCmd >> p)
else many (notFollowedBy binomCmd >> p)
let withCmd :: String -> TP Exp
withCmd cmd =
case lookup cmd binomCmds of
Just f -> f <$> (asGroup <$> pure initial)
<*> (asGroup <$> many p)
Nothing -> fail $ "Unknown command " ++ cmd
(binomCmd >>= withCmd) <|> return (asGroup initial)
manyExp :: TP Exp -> TP Exp
manyExp = manyExp' False
many1Exp :: TP Exp -> TP Exp
many1Exp = manyExp' True
inbraces :: TP Exp
inbraces = braces (manyExp expr)
texToken :: TP Exp
texToken = texSymbol <|> inbraces <|> inbrackets <|> texChar
texChar :: TP Exp
texChar =
do
c <- noneOf "\n\t\r \\{}" <* spaces
return $ if isDigit c
then ENumber [c]
else EIdentifier [c]
inbrackets :: TP Exp
inbrackets = (brackets $ manyExp $ notFollowedBy (char ']') >> expr)
number :: TP Exp
number = lexeme $ ENumber <$> decimalNumber
where decimalNumber = try $ do
xs <- many digit
pt <- option "" (string ".")
if null pt
then if null xs
then mzero
else return xs
else ((xs ++ pt) ++) <$> many1 digit
enclosure :: TP Exp
enclosure = basicEnclosure <|> scaledEnclosure <|> delimited
-- Expensive
basicEnclosure :: TP Exp
basicEnclosure = choice (map (\(s, v) -> symbol s >> return v) enclosures)
fence :: String -> TP String
fence cmd = do
symbol cmd
enc <- basicEnclosure <|> (try (symbol ".") >> return (ESymbol Open ""))
case enc of
ESymbol Open x -> return x
ESymbol Close x -> return x
_ -> mzero
middle :: TP String
middle = fence "\\middle"
right :: TP String
right = fence "\\right"
delimited :: TP Exp
delimited = do
openc <- try $ fence "\\left"
contents <- concat <$>
many (try $ ((:[]) . Left <$> middle)
<|> (map Right . unGrouped <$>
many1Exp (notFollowedBy right *> expr)))
closec <- right <|> return ""
return $ EDelimited openc closec contents
scaledEnclosure :: TP Exp
scaledEnclosure = do
cmd <- oneOfCommands (map fst S.scalers)
case S.getScalerValue cmd of
Just r -> EScaled r <$> basicEnclosure
Nothing -> mzero
endLine :: TP Char
endLine = try $ do
symbol "\\\\"
optional inbrackets -- can contain e.g. [1.0in] for a line height, not yet supported
optional $ ctrlseq "hline"
-- we don't represent the line, but it shouldn't crash parsing
return '\n'
arrayLine :: TP ArrayLine
arrayLine = notFollowedBy (ctrlseq "end" >> return '\n') >>
sepBy1 (unGrouped <$> manyExp (notFollowedBy endLine >> expr)) (symbol "&")
arrayAlignments :: TP [Alignment]
arrayAlignments = try $ do
as <- braces (many letter)
let letterToAlignment 'l' = AlignLeft
letterToAlignment 'c' = AlignCenter
letterToAlignment 'r' = AlignRight
letterToAlignment _ = AlignDefault
return $ map letterToAlignment as
environment :: TP Exp
environment = do
ctrlseq "begin"
name <- braces (oneOfStrings (M.keys environments) <* optional (char '*'))
spaces
case M.lookup name environments of
Just env -> do
result <- env
spaces
ctrlseq "end"
braces (string name <* optional (char '*'))
spaces
return result
Nothing -> mzero -- should not happen
environments :: M.Map String (TP Exp)
environments = M.fromList
[ ("array", stdarray)
, ("eqnarray", eqnarray)
, ("align", align)
, ("aligned", align)
, ("alignat", inbraces *> spaces *> align)
, ("alignedat", inbraces *> spaces *> align)
, ("flalign", flalign)
, ("flaligned", flalign)
, ("cases", cases)
, ("matrix", matrixWith "" "")
, ("smallmatrix", matrixWith "" "")
, ("pmatrix", matrixWith "(" ")")
, ("bmatrix", matrixWith "[" "]")
, ("Bmatrix", matrixWith "{" "}")
, ("vmatrix", matrixWith "\x2223" "\x2223")
, ("Vmatrix", matrixWith "\x2225" "\x2225")
, ("split", align)
, ("multline", gather)
, ("gather", gather)
, ("gathered", gather)
]
mbArrayAlignments :: TP (Maybe [Alignment])
mbArrayAlignments = option Nothing $ Just <$> arrayAlignments
alignsFromRows :: Alignment -> [ArrayLine] -> [Alignment]
alignsFromRows _ [] = []
alignsFromRows defaultAlignment (r:_) = replicate (length r) defaultAlignment
matrixWith :: String -> String -> TP Exp
matrixWith opendelim closedelim = do
mbaligns <- mbArrayAlignments
lines' <- sepEndBy1 arrayLine endLine
let aligns = fromMaybe (alignsFromRows AlignCenter lines') mbaligns
return $ if null opendelim && null closedelim
then EArray aligns lines'
else EDelimited opendelim closedelim [Right $ EArray aligns lines']
stdarray :: TP Exp
stdarray = do
mbaligns <- mbArrayAlignments
lines' <- sepEndBy1 arrayLine endLine
let aligns = fromMaybe (alignsFromRows AlignDefault lines') mbaligns
return $ EArray aligns lines'
gather :: TP Exp
gather = do
rows <- sepEndBy arrayLine endLine
return $ EArray (alignsFromRows AlignCenter rows) rows
eqnarray :: TP Exp
eqnarray = (EArray [AlignRight, AlignCenter, AlignLeft]) <$>
sepEndBy1 arrayLine endLine
align :: TP Exp
align = (EArray [AlignRight, AlignLeft]) <$> sepEndBy1 arrayLine endLine
flalign :: TP Exp
flalign = (EArray [AlignLeft, AlignRight]) <$> sepEndBy1 arrayLine endLine
cases :: TP Exp
cases = do
rs <- sepEndBy1 arrayLine endLine
return $ EDelimited "{" "" [Right $ EArray (alignsFromRows AlignDefault rs) rs]
variable :: TP Exp
variable = do
v <- letter
spaces
return $ EIdentifier [v]
isConvertible :: Exp -> Bool
isConvertible (EMathOperator x) = x `elem` convertibleOps
where convertibleOps = [ "lim","liminf","limsup","inf","sup"
, "min","max","Pr","det","gcd"
]
isConvertible (ESymbol Rel _) = True
isConvertible (ESymbol Bin _) = True
isConvertible (ESymbol Op x) = x `elem` convertibleSyms
where convertibleSyms = ["\x2211","\x220F","\x22C2",
"\x22C3","\x22C0","\x22C1","\x2A05","\x2A06",
"\x2210","\x2A01","\x2A02","\x2A00","\x2A04"]
isConvertible _ = False
-- check if sub/superscripts should always be under and over the expression
isUnderover :: Exp -> Bool
isUnderover (EOver _ _ (ESymbol Accent "\xFE37")) = True -- \overbrace
isUnderover (EOver _ _ (ESymbol Accent "\x23B4")) = True -- \overbracket
isUnderover (EUnder _ _ (ESymbol Accent "\xFE38")) = True -- \underbrace
isUnderover (EUnder _ _ (ESymbol Accent "\x23B5")) = True -- \underbracket
isUnderover (EOver _ _ (ESymbol Accent "\x23DE")) = True -- \overbrace
isUnderover (EUnder _ _ (ESymbol Accent "\x23DF")) = True -- \underbrace
isUnderover _ = False
subSup :: Maybe Bool -> Bool -> Exp -> TP Exp
subSup limits convertible a = try $ do
let sub1 = symbol "_" >> expr1
let sup1 = symbol "^" >> expr1
(b,c) <- try (do {m <- sub1; n <- sup1; return (m,n)})
<|> (do {n <- sup1; m <- sub1; return (m,n)})
return $ case limits of
Just True -> EUnderover False a b c
Nothing | convertible || isConvertible a -> EUnderover True a b c
| isUnderover a -> EUnderover False a b c
_ -> ESubsup a b c
superOrSubscripted :: Maybe Bool -> Bool -> Exp -> TP Exp
superOrSubscripted limits convertible a = try $ do
c <- oneOf "^_"
spaces
b <- expr
case c of
'^' -> return $ case limits of
Just True -> EOver False a b
Nothing
| convertible || isConvertible a -> EOver True a b
| isUnderover a -> EOver False a b
_ -> ESuper a b
'_' -> return $ case limits of
Just True -> EUnder False a b
Nothing
| convertible || isConvertible a -> EUnder True a b
| isUnderover a -> EUnder False a b
_ -> ESub a b
_ -> mzero
unicode :: TP Exp
unicode = lexeme $
do
c <- satisfy (not . isAscii)
return (ESymbol (getSymbolType c) [c])
ensuremath :: TP Exp
ensuremath = ctrlseq "ensuremath" *> inbraces
-- Note: cal and scr are treated the same way, as unicode is lacking such two different sets for those.
styleOps :: M.Map String ([Exp] -> Exp)
styleOps = M.fromList
[ ("\\mathrm", EStyled TextNormal)
, ("\\mathup", EStyled TextNormal)
, ("\\mbox", EStyled TextNormal)
, ("\\mathbf", EStyled TextBold)
, ("\\boldsymbol", EStyled TextBold)
, ("\\mathbfup", EStyled TextBold)
, ("\\mathit", EStyled TextItalic)
, ("\\mathtt", EStyled TextMonospace)
, ("\\texttt", EStyled TextMonospace)
, ("\\mathsf", EStyled TextSansSerif)
, ("\\mathsfup", EStyled TextSansSerif)
, ("\\mathbb", EStyled TextDoubleStruck)
, ("\\mathcal", EStyled TextScript)
, ("\\mathscr", EStyled TextScript)
, ("\\mathfrak", EStyled TextFraktur)
, ("\\mathbfit", EStyled TextBoldItalic)
, ("\\mathbfsfup", EStyled TextSansSerifBold)
, ("\\mathbfsfit", EStyled TextSansSerifBoldItalic)
, ("\\mathbfscr", EStyled TextBoldScript)
, ("\\mathbffrak", EStyled TextBoldFraktur)
, ("\\mathbfcal", EStyled TextBoldScript)
, ("\\mathsfit", EStyled TextSansSerifItalic)
]
diacritical :: TP Exp
diacritical = do
c <- oneOfCommands (map snd S.diacriticals)
case S.getDiacriticalCons c of
Just r -> r <$> texToken
Nothing -> mzero
phantom :: TP Exp
phantom = EPhantom <$> (ctrlseq "phantom" *> texToken)
boxed :: TP Exp
boxed = EBoxed <$> (ctrlseq "boxed" *> texToken)
text :: TP Exp
text = do
c <- oneOfCommands (M.keys textOps)
maybe mzero (<$> (bracedText <* spaces)) $ M.lookup c textOps
textOps :: M.Map String (String -> Exp)
textOps = M.fromList
[ ("\\textrm", (EText TextNormal))
, ("\\text", (EText TextNormal))
, ("\\textbf", (EText TextBold))
, ("\\textit", (EText TextItalic))
, ("\\texttt", (EText TextMonospace))
, ("\\textsf", (EText TextSansSerif))
]
styled :: TP Exp
styled = do
c <- oneOfCommands (M.keys styleOps)
case M.lookup c styleOps of
Just f -> do
x <- inbraces
return $ case x of
EGrouped xs -> f xs
_ -> f [x]
Nothing -> mzero
-- note: sqrt can be unary, \sqrt{2}, or binary, \sqrt[3]{2}
root :: TP Exp
root = do
ctrlseq "sqrt" <|> ctrlseq "surd"
(ERoot <$> inbrackets <*> texToken) <|> (ESqrt <$> texToken)
mspace :: TP Exp
mspace = do
ctrlseq "mspace"
lexeme $ char '{'
len <- many1 digit
lexeme $ string "mu"
lexeme $ char '}'
case reads len of
((n,[]):_) -> return $ ESpace (n/18)
_ -> mzero
binary :: TP Exp
binary = do
c <- oneOfCommands binops
a <- texToken
b <- texToken
case c of
"\\overset" -> return $ EOver False b a
"\\stackrel" -> return $ EOver False b a
"\\underset" -> return $ EUnder False b a
"\\frac" -> return $ EFraction NormalFrac a b
"\\tfrac" -> return $ EFraction InlineFrac a b
"\\dfrac" -> return $ EFraction DisplayFrac a b
"\\binom" -> return $ EDelimited "(" ")"
[Right (EFraction NoLineFrac a b)]
_ -> fail "Unrecognised binary operator"
where
binops = ["\\overset", "\\stackrel", "\\underset", "\\frac", "\\tfrac", "\\dfrac", "\\binom"]
texSymbol :: TP Exp
texSymbol = do
negated <- (try (ctrlseq "not") >> return True) <|> return False
sym <- operator <|> tSymbol
if negated then neg sym else return sym
oneOfCommands :: [String] -> TP String
oneOfCommands cmds = try $ do
cmd <- oneOfStrings cmds
case cmd of
['\\',c] | not (isLetter c) -> return ()
_ -> (do pos <- getPosition
letter
setPosition pos
mzero <?> ("non-letter after " ++ cmd))
<|> return ()
spaces
return cmd
oneOfStrings' :: (Char -> Char -> Bool) -> [String] -> TP String
oneOfStrings' _ [] = mzero
oneOfStrings' matches strs = try $ do
c <- anyChar
let strs' = [xs | (x:xs) <- strs, x `matches` c]
case strs' of
[] -> mzero
_ -> (c:) <$> oneOfStrings' matches strs'
<|> if "" `elem` strs'
then return [c]
else mzero
-- | Parses one of a list of strings. If the list contains
-- two strings one of which is a prefix of the other, the longer
-- string will be matched if possible.
oneOfStrings :: [String] -> TP String
oneOfStrings strs = oneOfStrings' (==) strs <??> (intercalate ", " $ map show strs)
-- | Like '(<?>)', but moves position back to the beginning of the parse
-- before reporting the error.
(<??>) :: Monad m => ParsecT s u m a -> String -> ParsecT s u m a
(<??>) p expected = do
pos <- getPosition
p <|> (setPosition pos >> mzero <?> expected)
infix 0 <??>
tSymbol :: TP Exp
tSymbol = do
sym <- oneOfCommands (M.keys symbols)
return $ fromJust (M.lookup sym symbols)
operator :: TP Exp
operator = do
sym <- lexeme (oneOfStrings $ M.keys operators)
return $ fromJust (M.lookup sym operators)
neg :: Exp -> TP Exp
neg (ESymbol Rel x) = ESymbol Rel `fmap`
case x of
"\x2282" -> return "\x2284"
"\x2283" -> return "\x2285"
"\x2286" -> return "\x2288"
"\x2287" -> return "\x2289"
"\x2208" -> return "\x2209"
_ -> mzero
neg _ = mzero
lexeme :: TP a -> TP a
lexeme p = p <* ignorable
braces :: TP a -> TP a
braces p = lexeme $ char '{' *> spaces *> p <* spaces <* char '}'
brackets :: TP a -> TP a
brackets p = lexeme $ char '[' *> spaces *> p <* spaces <* char ']'
symbol :: String -> TP String
symbol s = lexeme $ try $ string s
enclosures :: [(String, Exp)]
enclosures = [ ("(", ESymbol Open "(")
, (")", ESymbol Close ")")
, ("[", ESymbol Open "[")
, ("]", ESymbol Close "]")
, ("\\{", ESymbol Open "{")
, ("\\}", ESymbol Close "}")
, ("\\lbrack", ESymbol Open "[")
, ("\\lbrace", ESymbol Open "{")
, ("\\rbrack", ESymbol Close "]")
, ("\\rbrace", ESymbol Close "}")
, ("\\llbracket", ESymbol Open "\x27E6")
, ("\\rrbracket", ESymbol Close "\x27E7")
, ("\\langle", ESymbol Open "\x27E8")
, ("\\rangle", ESymbol Close "\x27E9")
, ("\\lfloor", ESymbol Open "\x230A")
, ("\\rfloor", ESymbol Close "\x230B")
, ("\\lceil", ESymbol Open "\x2308")
, ("\\rceil", ESymbol Close "\x2309")
, ("|", ESymbol Open "|")
, ("|", ESymbol Close "|")
, ("\\|", ESymbol Open "\x2225")
, ("\\|", ESymbol Close "\x2225")
, ("\\lvert", ESymbol Open "\x7C")
, ("\\rvert", ESymbol Close "\x7C")
, ("\\vert", ESymbol Close "\x7C")
, ("\\lVert", ESymbol Open "\x2225")
, ("\\rVert", ESymbol Close "\x2225")
, ("\\Vert", ESymbol Close "\x2016")
, ("\\ulcorner", ESymbol Open "\x231C")
, ("\\urcorner", ESymbol Close "\x231D")
]
operators :: M.Map String Exp
operators = M.fromList [
("+", ESymbol Bin "+")
, ("-", ESymbol Bin "\x2212")
, ("*", ESymbol Bin "*")
, ("@", ESymbol Ord "@")
, (",", ESymbol Pun ",")
, (".", ESymbol Ord ".")
, (";", ESymbol Pun ";")
, (":", ESymbol Rel ":")
, ("?", ESymbol Ord "?")
, (">", ESymbol Rel ">")
, ("<", ESymbol Rel "<")
, ("!", ESymbol Ord "!")
, ("'", ESymbol Ord "\x2032")
, ("''", ESymbol Ord "\x2033")
, ("'''", ESymbol Ord "\x2034")
, ("''''", ESymbol Ord "\x2057")
, ("=", ESymbol Rel "=")
, (":=", ESymbol Rel ":=")
, ("/", ESymbol Ord "/")
, ("~", ESpace (4/18)) ]
symbols :: M.Map String Exp
symbols = M.fromList
[ ("\\$", ESymbol Ord "$")
, ("\\%", ESymbol Ord "%")
, ("\\&", ESymbol Ord "&")
, ("\\_", ESymbol Ord "_")
, ("\\#", ESymbol Ord "#")
, ("\\^", ESymbol Ord "^")
, ("\\mid", ESymbol Bin "\x2223")
, ("\\colon", ESymbol Pun ":")
, ("\\parallel", ESymbol Rel "\x2225")
, ("\\backslash", ESymbol Bin "\x2216")
, ("\\setminus", ESymbol Bin "\\")
, ("\\times", ESymbol Bin "\x00D7")
, ("\\alpha", EIdentifier "\x03B1")
, ("\\beta", EIdentifier "\x03B2")
, ("\\chi", EIdentifier "\x03C7")
, ("\\delta", EIdentifier "\x03B4")
, ("\\Delta", ESymbol Op "\x0394")
, ("\\epsilon", EIdentifier "\x03F5")
, ("\\varepsilon", EIdentifier "\x03B5")
, ("\\eta", EIdentifier "\x03B7")
, ("\\gamma", EIdentifier "\x03B3")
, ("\\Gamma", ESymbol Op "\x0393")
, ("\\iota", EIdentifier "\x03B9")
, ("\\kappa", EIdentifier "\x03BA")
, ("\\lambda", EIdentifier "\x03BB")
, ("\\Lambda", ESymbol Op "\x039B")
, ("\\mu", EIdentifier "\x03BC")
, ("\\nu", EIdentifier "\x03BD")
, ("\\omega", EIdentifier "\x03C9")
, ("\\Omega", ESymbol Op "\x03A9")
, ("\\phi", EIdentifier "\x03D5")
, ("\\varphi", EIdentifier "\x03C6")
, ("\\Phi", ESymbol Op "\x03A6")
, ("\\pi", EIdentifier "\x03C0")
, ("\\Pi", ESymbol Op "\x03A0")
, ("\\psi", EIdentifier "\x03C8")
, ("\\Psi", ESymbol Ord "\x03A8")
, ("\\rho", EIdentifier "\x03C1")
, ("\\sigma", EIdentifier "\x03C3")
, ("\\Sigma", ESymbol Op "\x03A3")
, ("\\tau", EIdentifier "\x03C4")
, ("\\theta", EIdentifier "\x03B8")
, ("\\vartheta", EIdentifier "\x03D1")
, ("\\Theta", ESymbol Op "\x0398")
, ("\\upsilon", EIdentifier "\x03C5")
, ("\\Upsilon", EIdentifier "\x03A5")
, ("\\xi", EIdentifier "\x03BE")
, ("\\Xi", ESymbol Op "\x039E")
, ("\\zeta", EIdentifier "\x03B6")
, ("\\pm", ESymbol Bin "\x00B1")
, ("\\mp", ESymbol Bin "\x2213")
, ("\\triangleleft", ESymbol Bin "\x22B2")
, ("\\triangleright", ESymbol Bin "\x22B3")
, ("\\cdot", ESymbol Bin "\x22C5")
, ("\\star", ESymbol Bin "\x22C6")
, ("\\ast", ESymbol Bin "\x002A")
, ("\\times", ESymbol Bin "\x00D7")
, ("\\div", ESymbol Bin "\x00F7")
, ("\\circ", ESymbol Bin "\x2218")
, ("\\bullet", ESymbol Bin "\x2022")
, ("\\oplus", ESymbol Bin "\x2295")
, ("\\ominus", ESymbol Bin "\x2296")
, ("\\otimes", ESymbol Bin "\x2297")
, ("\\bigcirc", ESymbol Bin "\x25CB")
, ("\\oslash", ESymbol Bin "\x2298")
, ("\\odot", ESymbol Bin "\x2299")
, ("\\land", ESymbol Bin "\x2227")
, ("\\wedge", ESymbol Bin "\x2227")
, ("\\lor", ESymbol Bin "\x2228")
, ("\\vee", ESymbol Bin "\x2228")
, ("\\cap", ESymbol Bin "\x2229")
, ("\\cup", ESymbol Bin "\x222A")
, ("\\sqcap", ESymbol Bin "\x2293")
, ("\\sqcup", ESymbol Bin "\x2294")
, ("\\uplus", ESymbol Bin "\x228E")
, ("\\amalg", ESymbol Bin "\x2210")
, ("\\bigtriangleup", ESymbol Bin "\x25B3")
, ("\\bigtriangledown", ESymbol Bin "\x25BD")
, ("\\dag", ESymbol Bin "\x2020")
, ("\\dagger", ESymbol Bin "\x2020")
, ("\\ddag", ESymbol Bin "\x2021")
, ("\\ddagger", ESymbol Bin "\x2021")
, ("\\lhd", ESymbol Bin "\x22B2")
, ("\\rhd", ESymbol Bin "\x22B3")
, ("\\unlhd", ESymbol Bin "\x22B4")
, ("\\unrhd", ESymbol Bin "\x22B5")
, ("\\lt", ESymbol Rel "<")
, ("\\gt", ESymbol Rel ">")
, ("\\ne", ESymbol Rel "\x2260")
, ("\\neq", ESymbol Rel "\x2260")
, ("\\le", ESymbol Rel "\x2264")
, ("\\leq", ESymbol Rel "\x2264")
, ("\\leqslant", ESymbol Rel "\x2264")
, ("\\ge", ESymbol Rel "\x2265")
, ("\\geq", ESymbol Rel "\x2265")
, ("\\geqslant", ESymbol Rel "\x2265")
, ("\\equiv", ESymbol Rel "\x2261")
, ("\\ll", ESymbol Rel "\x226A")
, ("\\gg", ESymbol Rel "\x226B")
, ("\\doteq", ESymbol Rel "\x2250")
, ("\\prec", ESymbol Rel "\x227A")
, ("\\succ", ESymbol Rel "\x227B")
, ("\\preceq", ESymbol Rel "\x227C")
, ("\\succeq", ESymbol Rel "\x227D")
, ("\\subset", ESymbol Rel "\x2282")
, ("\\supset", ESymbol Rel "\x2283")
, ("\\subseteq", ESymbol Rel "\x2286")
, ("\\supseteq", ESymbol Rel "\x2287")
, ("\\nsubset", ESymbol Rel "\x2284")
, ("\\nsupset", ESymbol Rel "\x2285")
, ("\\nsubseteq", ESymbol Rel "\x2288")
, ("\\nsupseteq", ESymbol Rel "\x2289")
, ("\\sqsubset", ESymbol Rel "\x228F")
, ("\\sqsupset", ESymbol Rel "\x2290")
, ("\\sqsubseteq", ESymbol Rel "\x2291")
, ("\\sqsupseteq", ESymbol Rel "\x2292")
, ("\\sim", ESymbol Rel "\x223C")
, ("\\simeq", ESymbol Rel "\x2243")
, ("\\approx", ESymbol Rel "\x2248")
, ("\\cong", ESymbol Rel "\x2245")
, ("\\Join", ESymbol Rel "\x22C8")
, ("\\bowtie", ESymbol Rel "\x22C8")
, ("\\in", ESymbol Rel "\x2208")
, ("\\ni", ESymbol Rel "\x220B")
, ("\\owns", ESymbol Rel "\x220B")
, ("\\propto", ESymbol Rel "\x221D")
, ("\\vdash", ESymbol Rel "\x22A2")
, ("\\dashv", ESymbol Rel "\x22A3")
, ("\\models", ESymbol Rel "\x22A8")
, ("\\perp", ESymbol Rel "\x22A5")
, ("\\smile", ESymbol Rel "\x2323")
, ("\\frown", ESymbol Rel "\x2322")
, ("\\asymp", ESymbol Rel "\x224D")
, ("\\notin", ESymbol Rel "\x2209")
, ("\\gets", ESymbol Rel "\x2190")
, ("\\leftarrow", ESymbol Rel "\x2190")
, ("\\to", ESymbol Rel "\x2192")
, ("\\rightarrow", ESymbol Rel "\x2192")
, ("\\leftrightarrow", ESymbol Rel "\x2194")
, ("\\uparrow", ESymbol Rel "\x2191")
, ("\\downarrow", ESymbol Rel "\x2193")
, ("\\updownarrow", ESymbol Rel "\x2195")
, ("\\Leftarrow", ESymbol Rel "\x21D0")
, ("\\Rightarrow", ESymbol Rel "\x21D2")
, ("\\Leftrightarrow", ESymbol Rel "\x21D4")
, ("\\iff", ESymbol Rel "\x21D4")
, ("\\Uparrow", ESymbol Rel "\x21D1")
, ("\\Downarrow", ESymbol Rel "\x21D3")
, ("\\Updownarrow", ESymbol Rel "\x21D5")
, ("\\mapsto", ESymbol Rel "\x21A6")
, ("\\longleftarrow", ESymbol Rel "\x2190")
, ("\\longrightarrow", ESymbol Rel "\x2192")
, ("\\longleftrightarrow", ESymbol Rel "\x2194")
, ("\\Longleftarrow", ESymbol Rel "\x21D0")
, ("\\Longrightarrow", ESymbol Rel "\x21D2")
, ("\\Longleftrightarrow", ESymbol Rel "\x21D4")
, ("\\longmapsto", ESymbol Rel "\x21A6")
, ("\\sum", ESymbol Op "\x2211")
, ("\\prod", ESymbol Op "\x220F")
, ("\\bigcap", ESymbol Op "\x22C2")
, ("\\bigcup", ESymbol Op "\x22C3")
, ("\\bigwedge", ESymbol Op "\x22C0")
, ("\\bigvee", ESymbol Op "\x22C1")
, ("\\bigsqcap", ESymbol Op "\x2A05")
, ("\\bigsqcup", ESymbol Op "\x2A06")
, ("\\coprod", ESymbol Op "\x2210")
, ("\\bigoplus", ESymbol Op "\x2A01")
, ("\\bigotimes", ESymbol Op "\x2A02")
, ("\\bigodot", ESymbol Op "\x2A00")
, ("\\biguplus", ESymbol Op "\x2A04")
, ("\\int", ESymbol Op "\x222B")
, ("\\iint", ESymbol Op "\x222C")
, ("\\iiint", ESymbol Op "\x222D")
, ("\\oint", ESymbol Op "\x222E")
, ("\\prime", ESymbol Ord "\x2032")
, ("\\dots", ESymbol Ord "\x2026")
, ("\\ldots", ESymbol Ord "\x2026")
, ("\\cdots", ESymbol Ord "\x22EF")
, ("\\vdots", ESymbol Ord "\x22EE")
, ("\\ddots", ESymbol Ord "\x22F1")
, ("\\forall", ESymbol Op "\x2200")
, ("\\exists", ESymbol Op "\x2203")
, ("\\Re", ESymbol Ord "\x211C")
, ("\\Im", ESymbol Ord "\x2111")
, ("\\aleph", ESymbol Ord "\x2135")
, ("\\hbar", ESymbol Ord "\x210F")
, ("\\ell", ESymbol Ord "\x2113")
, ("\\wp", ESymbol Ord "\x2118")
, ("\\emptyset", ESymbol Ord "\x2205")
, ("\\infty", ESymbol Ord "\x221E")
, ("\\partial", ESymbol Ord "\x2202")
, ("\\nabla", ESymbol Ord "\x2207")
, ("\\triangle", ESymbol Ord "\x25B3")
, ("\\therefore", ESymbol Pun "\x2234")
, ("\\angle", ESymbol Ord "\x2220")
, ("\\diamond", ESymbol Op "\x22C4")
, ("\\Diamond", ESymbol Op "\x25C7")
, ("\\lozenge", ESymbol Op "\x25CA")
, ("\\neg", ESymbol Op "\x00AC")
, ("\\lnot", ESymbol Ord "\x00AC")
, ("\\bot", ESymbol Ord "\x22A5")
, ("\\top", ESymbol Ord "\x22A4")
, ("\\square", ESymbol Ord "\x25AB")
, ("\\Box", ESymbol Op "\x25A1")
, ("\\wr", ESymbol Ord "\x2240")
, ("\\!", ESpace (-3/18))
, ("\\,", ESpace (3/18))
, ("\\>", ESpace (4/18))
, ("\\:", ESpace (4/18))
, ("\\;", ESpace (5/18))
, ("\\ ", ESpace (4/18))
, ("\\quad", ESpace 1)
, ("\\qquad", ESpace 2)
, ("\\arccos", EMathOperator "arccos")
, ("\\arcsin", EMathOperator "arcsin")
, ("\\arctan", EMathOperator "arctan")
, ("\\arg", EMathOperator "arg")
, ("\\cos", EMathOperator "cos")
, ("\\cosh", EMathOperator "cosh")
, ("\\cot", EMathOperator "cot")
, ("\\coth", EMathOperator "coth")
, ("\\csc", EMathOperator "csc")
, ("\\deg", EMathOperator "deg")
, ("\\det", EMathOperator "det")
, ("\\dim", EMathOperator "dim")
, ("\\exp", EMathOperator "exp")
, ("\\gcd", EMathOperator "gcd")
, ("\\hom", EMathOperator "hom")
, ("\\inf", EMathOperator "inf")
, ("\\ker", EMathOperator "ker")
, ("\\lg", EMathOperator "lg")
, ("\\lim", EMathOperator "lim")
, ("\\liminf", EMathOperator "liminf")
, ("\\limsup", EMathOperator "limsup")
, ("\\ln", EMathOperator "ln")
, ("\\log", EMathOperator "log")
, ("\\max", EMathOperator "max")
, ("\\min", EMathOperator "min")
, ("\\Pr", EMathOperator "Pr")
, ("\\sec", EMathOperator "sec")
, ("\\sin", EMathOperator "sin")
, ("\\sinh", EMathOperator "sinh")
, ("\\sup", EMathOperator "sup")
, ("\\tan", EMathOperator "tan")
, ("\\tanh", EMathOperator "tanh")
]
-- text mode parsing
textual :: TP String
textual = regular <|> sps <|> ligature <|> textCommand <|> bracedText
<?> "text"
sps :: TP String
sps = " " <$ skipMany1 (oneOf " \t\n")
regular :: TP String
regular = many1 (noneOf "`'-~${}\\ \t")
ligature :: TP String
ligature = try ("\x2014" <$ string "---")
<|> try ("\x2013" <$ string "--")
<|> try ("\x201C" <$ string "``")
<|> try ("\x201D" <$ string "''")
<|> try ("\x2019" <$ string "'")
<|> try ("\x2018" <$ string "`")
<|> try ("\xA0" <$ string "~")
textCommand :: TP String
textCommand = do
cmd <- oneOfCommands (M.keys textCommands)
case M.lookup cmd textCommands of
Nothing -> fail ("Unknown control sequence " ++ cmd)
Just c -> c
bracedText :: TP String
bracedText = do
char '{'
inner <- concat <$> many textual
char '}'
return inner
tok :: TP Char
tok = (try $ char '{' *> spaces *> anyChar <* spaces <* char '}')
<|> anyChar
textCommands :: M.Map String (TP String)
textCommands = M.fromList
[ ("\\#", return "#")
, ("\\$", return "$")
, ("\\%", return "%")