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Diffstat (limited to 'Com/Simatime/language/Bs/Parser.hs')
-rw-r--r-- | Com/Simatime/language/Bs/Parser.hs | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/Com/Simatime/language/Bs/Parser.hs b/Com/Simatime/language/Bs/Parser.hs deleted file mode 100644 index 3044a60..0000000 --- a/Com/Simatime/language/Bs/Parser.hs +++ /dev/null @@ -1,121 +0,0 @@ -{-# LANGUAGE FlexibleContexts #-} -{-# LANGUAGE OverloadedStrings #-} -{-# LANGUAGE NoImplicitPrelude #-} -module Language.Bs.Parser ( - readExpr -, readExprFile -) where - -import Control.Monad (fail) -import Control.Monad (mzero) -import Data.Char (digitToInt) -import Data.Functor.Identity (Identity) -import Data.String -import qualified Data.Text as T -import Language.Bs.Expr -import Protolude hiding ((<|>), try) -import Text.Parsec -import qualified Text.Parsec.Language as Lang -import Text.Parsec.Text -import qualified Text.Parsec.Token as Tok - -lexer :: Tok.GenTokenParser T.Text () Identity -lexer = Tok.makeTokenParser style - -style :: Tok.GenLanguageDef T.Text () Identity -style = Lang.emptyDef { - Tok.commentStart = "#|" - , Tok.commentEnd = "|#" - , Tok.commentLine = ";" - , Tok.opStart = mzero - , Tok.opLetter = mzero - , Tok.identStart = letter <|> oneOf "!$%&*/:<=>?^_~" - , Tok.identLetter = digit <|> letter <|> oneOf "!$%&*/:<=>?^_~+-.@" - } - -parens :: Parser a -> Parser a -parens = Tok.parens lexer - -whitespace :: Parser () -whitespace = Tok.whiteSpace lexer - -lexeme :: Parser a -> Parser a -lexeme = Tok.lexeme lexer - -quoted :: Parser a -> Parser a -quoted p = try (char '\'') *> p - -identifier :: Parser T.Text -identifier = T.pack <$> (Tok.identifier lexer <|> specialIdentifier) <?> "identifier" - where - specialIdentifier :: Parser String - specialIdentifier = lexeme $ try $ - string "-" <|> string "+" <|> string "..." - --- | The @Radix@ type consists of a base integer (e.g. @10@) and a parser for --- digits in that base (e.g. @digit@). -type Radix = (Integer, Parser Char) - --- | Parse an integer, given a radix as output by @radix@. --- Copied from Text.Parsec.Token -numberWithRadix :: Radix -> Parser Integer -numberWithRadix (base, baseDigit) = do - digits <- many1 baseDigit - let n = foldl (\x d -> base*x + toInteger (digitToInt d)) 0 digits - seq n (return n) - -decimal :: Parser Integer -decimal = Tok.decimal lexer - --- | Parse a sign, return either @id@ or @negate@ based on the sign parsed. --- Copied from Text.Parsec.Token -sign :: Parser (Integer -> Integer) -sign = char '-' *> return negate - <|> char '+' *> return identity - <|> return identity - -intRadix :: Radix -> Parser Integer -intRadix r = sign <*> numberWithRadix r - -textLiteral :: Parser T.Text -textLiteral = T.pack <$> Tok.stringLiteral lexer - -nil :: Parser () -nil = try ((char '\'') *> string "()") *> return () <?> "nil" - -hashVal :: Parser Expr -hashVal = lexeme $ char '#' - *> (char 't' *> return (Bool True) - <|> char 'f' *> return (Bool False) - <|> char 'b' *> (Numb <$> intRadix (2, oneOf "01")) - <|> char 'o' *> (Numb <$> intRadix (8, octDigit)) - <|> char 'd' *> (Numb <$> intRadix (10, digit)) - <|> char 'x' *> (Numb <$> intRadix (16, hexDigit)) - <|> oneOf "ei" *> fail "Unsupported: exactness" - <|> char '(' *> fail "Unsupported: vector" - <|> char '\\' *> fail "Unsupported: char") - - -lispVal :: Parser Expr -lispVal = hashVal - <|> Nil <$ nil - <|> Numb <$> try (sign <*> decimal) - <|> Atom <$> identifier - <|> Tape <$> textLiteral - <|> _Quote <$> quoted lispVal - <|> List <$> parens manyExpr - -manyExpr :: Parser [Expr] -manyExpr = lispVal `sepBy` whitespace - -_Quote :: Expr -> Expr -_Quote x = List [Atom "quote", x] - -contents :: Parser a -> ParsecT T.Text () Identity a -contents p = whitespace *> lexeme p <* eof - -readExpr :: T.Text -> Either ParseError Expr -readExpr = parse (contents lispVal) "<stdin>" - -readExprFile :: SourceName -> T.Text -> Either ParseError Expr -readExprFile = parse (contents (List <$> manyExpr)) |