tools/PascalParser.hs
author Zorg <zorgiepoo@gmail.com>
Wed, 08 Jun 2011 03:36:54 -0400
changeset 5229 148d581b17ab
parent 4353 671d66ba3af6
child 6270 0a99f73dd8dd
permissions -rw-r--r--
Attempt to fix issue #125. The password pop-up doesn't appear every time when going into the official server anymore, now it only does it when the password is blank. If a user enters an invalid password, the password is set blank to avoid the user going back to the official server just to be rejected. When entering an invalid password, the unknown error dialog doesn't show up anymore, but the connection lost to server one still does. This fixes the bug where the user would be spammed with error messages. The user can also now change his password in the settings page.
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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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    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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    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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    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