type

[cc1516.git] / lex.icl

diff --git a/lex.icl b/lex.icl
deleted file mode 100644 (file)
index 82e6139..0000000
--- a/lex.icl
+++ /dev/null
@@ -1,78 +0,0 @@
-implementation module lex
-
-import Control.Monad
-import Data.Either, Data.Maybe, Data.Map, Data.Func
-import StdString
-import StdTuple
-import StdBool
-import StdList
-import StdChar
-
-SingleCharTokens :: Map Char TokenValue
-SingleCharTokens = fromList [
-       ('(', BraceOpenToken), (')', BraceCloseToken), ('{', CBraceOpenToken),
-       ('}', CBraceCloseToken), ('[', SquareOpenToken), (']', SquareCloseToken),
-       (',', CommaToken), (':', ColonToken), (';', SColonToken),
-       ('.', DotToken), ('+', PlusToken), ('*', StarToken), ('/', SlashToken),
-       ('%', PercentToken), ('=', AssignmentToken), ('<', LesserToken),
-       ('>', BiggerToken), ('!', ExclamationToken)]
-
-EscapeMap :: Map Char Char
-EscapeMap = fromList [('a', toChar 7), ('b', '\b'), ('f', '\f'), ('n', '\n'),
-       ('r', '\r'), ('t', '\t'), ('v', '\v')]
-
-lexer :: [Char] -> LexerOutput
-lexer x = lexer` x 1
-       where
-               lexer` :: [Char] Int -> LexerOutput
-               lexer` [] i = Right []
-               lexer` x i = case lex x i of
-                       (Right t, rest, i) = lexer` rest i >>= \ts.Right [t:ts]
-                       (Left e, _, _) = Left e
-
-ret:: TokenValue [Char] Int -> (Either String Token, [Char], Int)
-ret tv rest i = (Right (i, tv), rest, i)
-
-err :: String Int -> (Either String Token, [Char], Int)
-err s i = (Left ("Line " +++ toString i +++ ": " +++ s), [], i)
-
-lex :: [Char] -> (Int -> (Either String Token, [Char], Int))
-lex [] = ret EndOfFileToken []
-lex ['/':'/':xs] = lex (dropWhile ((<>) '\n') xs)
-lex ['/':'*':xs] =  \i.let (c, r) = span ((<>) ('*','/')) $ zip2 [' ':xs] xs in
-       lex (tl $ map snd $ tl $ r) (i + length [x\\(x, _)<-c | x == '\n'])
-lex ['v':'a':'r':xs] = ret VarToken xs
-lex ['V':'o':'i':'d':xs] = ret VoidToken xs
-lex ['r':'e':'t':'u':'r':'n':xs] = ret ReturnToken xs
-lex ['i':'f':xs] = ret IfToken xs
-lex ['e':'l':'s':'e':xs] = ret ElseToken xs
-lex ['w':'h':'i':'l':'e':xs] = ret WhileToken xs
-lex ['T':'r':'u':'e':xs] = ret TrueToken xs
-lex ['F':'a':'l':'s':'e':xs] = ret FalseToken xs
-lex ['I':'n':'t':xs] = ret IntTypeToken xs
-lex ['C':'h':'a':'r':xs] = ret CharTypeToken xs
-lex ['B':'o':'o':'l':xs] = ret BoolTypeToken xs
-lex [':':':':xs] = ret DoubleColonToken xs
-lex ['!':'=':xs] = ret NotEqualToken xs
-lex ['<':'=':xs] = ret LesserEqToken xs
-lex ['>':'=':xs] = ret GreaterEqToken xs
-lex ['=':'=':xs] = ret EqualsToken xs
-lex ['&':'&':xs] = ret AmpersandsToken xs
-lex ['|':'|':xs] = ret PipesToken xs
-lex ['-':'>':xs] = ret ArrowToken xs
-lex ['\'':x:'\'':xs] = ret (CharToken x) xs
-lex ['\'':'\\':x:'\'':xs] = case get x EscapeMap of
-       Just t = ret (CharToken t) xs
-       _ = err ("Unknown escape: \\" +++ toString x)
-lex ['-':t=:[x:xs]]
-| isDigit x = let (n, r) = span isDigit t in ret (NumberToken ['-':n]) r
-| otherwise = ret DashToken  xs
-lex t=:[x:xs] = case get x SingleCharTokens of
-       (Just tok) = ret tok xs
-       Nothing
-       | x == '\n' = \i.lex xs (i+1)
-       | isSpace x = lex xs
-       | isDigit x = let (v, r) = span isDigit t in ret (NumberToken v) r
-       | isAlpha x = let (v, r) = span isIdent t in ret (IdentToken v) r
-               with isIdent c = isAlphanum c || c == '_'
-       | otherwise = err ("Unexpected character: " +++ toString x)