X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=lex.icl;h=6966cde7acf7095d0627c7e18108c5818f87fc02;hb=e82c306fc0f6401a09d3d180e20070664935a390;hp=cc4bc2f9a46eaa6fcc1074971d9ab902c9fbc848;hpb=9b74ace948b5035934d377a712eddda653bc640e;p=cc1516.git

diff --git a/lex.icl b/lex.icl
index cc4bc2f..6966cde 100644
--- a/lex.icl
+++ b/lex.icl
@@ -1,32 +1,69 @@
 implementation module lex
 
+import Control.Monad
 import Data.Either
-import Data.List
+import Data.Maybe
+import Data.Map
 import StdString
-import System.CommandLine
-import StdFile
-import StdMisc
+import StdBool
+import StdList
+import StdChar
+import qualified Text
 
-// Misschien moeten we hier continuation style van maken
-instance toString lexerOutput where
-	toString l = "dit is een lexer output, danwel error\n"
+SingleCharTokens :: Map Char Token
+SingleCharTokens = fromList [
+	('(', BraceOpenToken), (')', BraceCloseToken), ('{', CBraceOpenToken),
+	('}', CBraceCloseToken), ('[', SquareOpenToken), (']', SquareCloseToken),
+	(',', CommaToken), (':', ColonToken), (';', SColonToken),
+	('.', DotToken), ('+', PlusToken), ('-', DashToken), ('*', 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 _ = Left "Not Implemented"
+lexer [] = Right []
+lexer x = case lex x of
+	(Right t, rest) = lexer rest >>= \ts.Right [t:ts]
+	(Left e, _) = Left e
 
-Start :: *World -> *World
-Start w
-# (args, w) = getCommandLine w // We lezen nu nog standaard van stdin
-# (out, w) = stdio w
-# (toparse, out) = readEntireFile out
-# out = out <<< toString (lexer toparse)
-# (b, w) = fclose out w
-| not b = setReturnCode 1 w
-= w
-	where
-		readEntireFile :: *File -> *([Char], *File)
-		readEntireFile f
-		# (b, c, f) = freadc f
-		| not b = ([], f)
-		# (cs, f) = readEntireFile f
-		= ([c:cs], f)
+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), [])