author | sheepluva |
Fri, 21 Oct 2011 08:03:42 +0200 (2011-10-21) | |
changeset 6166 | 701c5b8fac56 |
parent 4353 | 671d66ba3af6 |
child 6270 | 0a99f73dd8dd |
permissions | -rw-r--r-- |
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Dumb parser of pascal, and a program which lists unit dependencies
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module PascalParser where |
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import Text.ParserCombinators.Parsec |
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import Control.Monad |
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data PascalUnit = |
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Program Identificator Implementation FunctionBody |
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| Unit Identificator Interface Implementation (Maybe Initialize) (Maybe Finalize) |
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deriving Show |
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data Interface = Interface Uses TypesAndVars |
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deriving Show |
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data Implementation = Implementation Uses TypesAndVars Functions |
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deriving Show |
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data Functions = Functions [Function] |
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deriving Show |
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data Function = Function String |
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deriving Show |
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data Identificator = Identificator String |
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deriving Show |
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data FunctionBody = FunctionBody String |
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deriving Show |
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data TypesAndVars = TypesAndVars String |
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deriving Show |
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data Initialize = Initialize Functions |
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deriving Show |
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data Finalize = Finalize Functions |
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deriving Show |
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data Uses = Uses [Identificator] |
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deriving Show |
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parsePascalUnit :: String -> Either ParseError PascalUnit |
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parsePascalUnit = parse pascalUnit "unit" |
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where |
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comments = skipMany (comment >> spaces) |
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identificator = do |
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spaces |
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l <- letter <|> oneOf "_" |
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ls <- many (alphaNum <|> oneOf "_") |
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spaces |
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return $ Identificator (l:ls) |
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pascalUnit = do |
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spaces |
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comments |
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u <- choice [program, unit] |
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comments |
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spaces |
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return u |
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comment = choice [ |
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char '{' >> manyTill anyChar (try $ char '}') |
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, string "(*" >> manyTill anyChar (try $ string "*)") |
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, string "//" >> manyTill anyChar (try newline) |
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] |
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unit = do |
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name <- unitName |
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spaces |
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comments |
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int <- string "interface" >> interface |
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manyTill anyChar (try $ string "implementation") |
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spaces |
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comments |
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impl <- implementation |
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return $ Unit name int impl Nothing Nothing |
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where |
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unitName = between (string "unit") (char ';') identificator |
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interface = do |
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spaces |
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comments |
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u <- uses |
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return $ Interface u (TypesAndVars "") |
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|
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program = do |
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name <- programName |
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spaces |
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comments |
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impl <- implementation |
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return $ Program name impl (FunctionBody "") |
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where |
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programName = between (string "program") (char ';') identificator |
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|
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implementation = do |
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u <- uses |
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manyTill anyChar (try $ string "end.") |
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return $ Implementation u (TypesAndVars "") (Functions []) |
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|
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uses = liftM Uses (option [] u) |
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where |
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u = do |
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string "uses" |
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spaces |
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u <- (identificator >>= \i -> spaces >> return i) `sepBy1` (char ',' >> spaces) |
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char ';' |
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spaces |
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return u |