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{-# LANGUAGE FlexibleContexts, NoMonomorphismRestriction #-}
module PascalBasics where
import Text.Parsec.Combinator
import Text.Parsec.Char hiding (string')
import Text.Parsec.Prim
import Text.Parsec.Token
import Text.Parsec.Language
import Data.Char
import Control.Monad
import Data.Functor.Identity
char' :: Char -> Parsec String u ()
char' = void . char
string' :: String -> Parsec String u ()
string' = void . string
builtin :: [String]
builtin = ["succ", "pred", "low", "high", "ord", "inc", "dec", "exit", "break", "continue", "length", "copy"]
pascalLanguageDef :: GenLanguageDef String u Identity
pascalLanguageDef
= emptyDef
{ commentStart = "(*"
, commentEnd = "*)"
, commentLine = "//"
, nestedComments = False
, identStart = letter <|> oneOf "_"
, identLetter = alphaNum <|> oneOf "_"
, opLetter = letter
, reservedNames = [
"begin", "end", "program", "unit", "interface"
, "implementation", "and", "or", "xor", "shl"
, "shr", "while", "do", "repeat", "until", "case", "of"
, "type", "var", "const", "out", "array", "packed"
, "procedure", "function", "with", "for", "to"
, "downto", "div", "mod", "record", "set", "nil"
, "cdecl", "external", "if", "then", "else"
] -- ++ builtin
, caseSensitive = False
}
preprocessorSwitch :: Stream String Identity Char => Parsec String u String
preprocessorSwitch = do
try $ string' "{$"
s <- manyTill (noneOf "\n") $ char '}'
return s
caseInsensitiveString :: Stream String Identity Char => String -> Parsec String u String
caseInsensitiveString s = do
mapM_ (\a -> satisfy (\b -> toUpper a == toUpper b)) s <?> s
return s
pas :: GenTokenParser String u Identity
pas = patch $ makeTokenParser pascalLanguageDef
where
patch tp = tp {stringLiteral = stringL}
comment :: Stream String Identity Char => Parsec String u String
comment = choice [
char '{' >> notFollowedBy (char '$') >> manyTill anyChar (try $ char '}')
, (try $ string "(*") >> manyTill anyChar (try $ string "*)")
, (try $ string "//") >> manyTill anyChar (try newline)
]
comments :: Parsec String u ()
comments = do
spaces
skipMany $ do
void $ preprocessorSwitch <|> comment
spaces
stringL :: Parsec String u String
stringL = do
char' '\''
s <- (many $ noneOf "'")
char' '\''
ss <- many $ do
char' '\''
s' <- (many $ noneOf "'")
char' '\''
return $ '\'' : s'
comments
return $ concat (s:ss)
|
