X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=lex.icl;h=de200df2f4dcd62930ea1e74bf20f97fb7b9872a;hb=75ac4a13efdc20b444a5eb6cb2d16425c82d333e;hp=6966cde7acf7095d0627c7e18108c5818f87fc02;hpb=e82c306fc0f6401a09d3d180e20070664935a390;p=cc1516.git

diff --git a/lex.icl b/lex.icl
index 6966cde..de200df 100644
--- a/lex.icl
+++ b/lex.icl
@@ -1,69 +1,80 @@
 implementation module lex
 
 import Control.Monad
-import Data.Either
-import Data.Maybe
-import Data.Map
+import Data.Either, Data.Maybe, Data.Map, Data.Func
 import StdString
+import StdTuple
 import StdBool
 import StdList
 import StdChar
-import qualified Text
 
-SingleCharTokens :: Map Char Token
+SingleCharTokens :: Map Char TokenValue
 SingleCharTokens = fromList [
 	('(', BraceOpenToken), (')', BraceCloseToken), ('{', CBraceOpenToken),
 	('}', CBraceCloseToken), ('[', SquareOpenToken), (']', SquareCloseToken),
 	(',', CommaToken), (':', ColonToken), (';', SColonToken),
-	('.', DotToken), ('+', PlusToken), ('-', DashToken), ('*', StarToken),
-	('/', SlashToken), ('%', PercentToken), ('=', AssignmentToken),
-	('<', LesserToken), ('>', BiggerToken), ('!', ExclamationToken)]
+	('.', 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')]
+EscapeMap = fromList [('a', toChar 7), ('b', '\b'), ('f', '\f'), ('n', '\n'),
+	('r', '\r'), ('t', '\t'), ('v', '\v')]
 
 lexer :: [Char] -> LexerOutput
-lexer [] = Right []
-lexer x = case lex x of
-	(Right t, rest) = lexer rest >>= \ts.Right [t:ts]
-	(Left e, _) = Left e
+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
 
-lex :: [Char] -> (Either String Token, [Char])
-lex [] = (Right EndOfFileToken, [])
-lex ['/':'/':x:rest] = if (x == '\n') (lex rest) (lex ['/':'/':rest])
-lex ['/':'*':x1:x2:rest] = if (x1 == '*' && x2 == '/') 
-	(lex rest) (lex ['/':'*':rest])
-lex ['v':'a':'r':rest] = (Right VarToken, rest)
-lex ['V':'o':'i':'d':rest] = (Right VoidToken, rest)
-lex ['r':'e':'t':'u':'r':'n':rest] = (Right ReturnToken, rest)
-lex ['i':'f':rest] = (Right IfToken, rest)
-lex ['e':'l':'s':'e':rest] = (Right ElseToken, rest)
-lex ['w':'h':'i':'l':'e':rest] = (Right WhileToken, rest)
-lex ['T':'r':'u':'e':rest] = (Right TrueToken, rest)
-lex ['F':'a':'l':'s':'e':rest] = (Right FalseToken, rest)
-lex ['I':'n':'t':rest] = (Right IntTypeToken, rest)
-lex ['C':'h':'a':'r':rest] = (Right CharTypeToken, rest)
-lex ['B':'o':'o':'l':rest] = (Right BoolTypeToken, rest)
-lex [':':':':rest] = (Right DoubleColonToken, rest)
-lex ['!':'=':rest] = (Right NotEqualToken, rest)
-lex ['<':'=':rest] = (Right LesserEqToken, rest)
-lex ['>':'=':rest] = (Right GreaterEqToken, rest)
-lex ['=':'=':rest] = (Right EqualsToken, rest)
-lex ['&':'&':rest] = (Right AmpersandsToken, rest)
-lex ['|':'|':rest] = (Right PipesToken, rest)
-lex ['-':'>':rest] = (Right ArrowToken, rest)
-lex ['\'':x:'\'':rest] = (Right (CharToken x), rest)
-lex ['\'':'\\':x:'\'':rest] = case get x EscapeMap of
-	Just t = (Right (CharToken t), rest)
-	_ = (Left ("Unknown escape: \\" +++ toString x), [])
-lex [x:rest]
-# t = get x SingleCharTokens
-| isJust t = (Right (fromJust t), rest)
-| isSpace x = lex rest
-| isDigit x = let (is, rest`) = span isDigit rest in
-	(Right (NumberToken [x:is]), rest`)
-| isAlpha x = let (is, rest`) = span (\c.isAlphanum c || c == '_') rest in
-	(Right (IdentToken [x:is]), rest`)
-| otherwise = (Left ("Unexpected character: " +++ toString x), [])
+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 (toInt $ toString ['-':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 (toInt $ toString 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)