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{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE OverloadedStrings #-}
module Language.Fiddle.Tokenizer where
import Data.Char (isDigit)
import Data.Text (Text)
import qualified Data.Text
import Language.Fiddle.Types
import Text.Parsec
data T
= KWAssertPos
| KWAt
| KWBits
| KWEnum
| KWInstance
| KWLocation
| KWOption
| KWPackage
| KWReg
| KWReserved
| KWRo
| KWRw
| KWStruct
| KWType
| KWUnion
| KWWo
| KWImport
| KWUsing
| KWSkipTo
| KWBuffer
| TokColon
| TokComma
| TokDot
| TokComment !Text
| TokDocComment !Text
| TokEq
| TokIdent !Text
| TokLBrace
| TokLBracket
| TokLParen
| TokLitNum !Text
| TokRBrace
| TokRBracket
| TokRParen
| TokSemi
| TokString !Text
| TokDirectiveStart -- [[
| TokDirectiveEnd -- ]]
deriving (Eq, Ord, Show, Read)
textOf :: T -> Maybe Text
textOf t = do
case t of
KWAssertPos -> Just "assert_pos"
KWAt -> Just "at"
KWBits -> Just "bits"
KWEnum -> Just "enum"
KWInstance -> Just "instance"
KWLocation -> Just "location"
KWOption -> Just "option"
KWPackage -> Just "package"
KWReg -> Just "reg"
KWReserved -> Just "reserved"
KWRo -> Just "ro"
KWRw -> Just "rw"
KWStruct -> Just "struct"
KWType -> Just "type"
KWUnion -> Just "union"
KWWo -> Just "wo"
KWImport -> Just "import"
KWUsing -> Just "using"
KWBuffer -> Just "buffer"
KWSkipTo -> Just "skip_to"
TokIdent i -> Just i
TokLitNum n -> Just n
_ -> Nothing
data Token a = Token !T a
deriving (Eq, Ord, Show, Functor)
parseToken :: (Monad m) => ParsecT Text u m (Token SourceSpan)
parseToken = spaces *> tok parseToken' <* spaces
where
tok tp = do
p1 <- getPosition
t <- tp
Token t . SourceSpan p1 <$> getPosition
parseAlNumTok :: Text -> T
parseAlNumTok str =
case str of
"at" -> KWAt
"bits" -> KWBits
"enum" -> KWEnum
"location" -> KWLocation
"instance" -> KWInstance
"type" -> KWType
"option" -> KWOption
"package" -> KWPackage
"import" -> KWImport
"reg" -> KWReg
"ro" -> KWRo
"wo" -> KWWo
"rw" -> KWRw
"reserved" -> KWReserved
"union" -> KWUnion
"using" -> KWUsing
"struct" -> KWStruct
"assert_pos" -> KWAssertPos
"skip_to" -> KWSkipTo
"buffer" -> KWBuffer
(Data.Text.head -> h) | isDigit h -> TokLitNum str
ident -> TokIdent ident
parseString = fmap (TokString . Data.Text.pack . concat) $ do
_ <- char '"'
manyTill
( do
c <- anyChar
if c == '\\'
then do
c2 <- anyChar
return [c, c2]
else return [c]
)
(char '"')
parseComment =
try
( do
_ <- string "//"
TokComment . Data.Text.pack <$> manyTill anyChar (char '\n')
)
<|> try
( do
_ <- string "/**"
TokDocComment . Data.Text.pack <$> manyTill anyChar (try $ string "*/")
)
parseSymbol =
choice
[ try (string "[[" $> TokDirectiveStart),
try (string "]]" $> TokDirectiveEnd),
char ':' $> TokColon,
char ',' $> TokComma,
char '.' $> TokDot,
char '=' $> TokEq,
char '{' $> TokLBrace,
char '[' $> TokLBracket,
char '(' $> TokLParen,
char '}' $> TokRBrace,
char ']' $> TokRBracket,
char ')' $> TokRParen,
char ';' $> TokSemi
]
where
a $> b = a >> return b
parseToken' =
fmap (parseAlNumTok . Data.Text.pack) (many1 (alphaNum <|> char '_'))
<|> parseString
<|> parseComment
<|> parseSymbol
tokenize :: String -> Text -> Either ParseError [Token SourceSpan]
tokenize = Text.Parsec.runParser (many parseToken <* eof) ()
tokenType :: Token SourceSpan -> T
tokenType (Token t _) = t
|
