From 8de73bb36ae068011c2c1b1fc9b3c9091a897997 Mon Sep 17 00:00:00 2001
From: Mart Lubbers <mart@martlubbers.net>
Date: Fri, 12 Feb 2016 13:05:45 +0100
Subject: [PATCH] lexing and printing is working

---
 lex.dcl |   3 +-
 lex.icl | 372 ++++++++++++++++++--------------------------------------
 2 files changed, 122 insertions(+), 253 deletions(-)

diff --git a/lex.dcl b/lex.dcl
index 56c3765..46a3ab8 100644
--- a/lex.dcl
+++ b/lex.dcl
@@ -5,7 +5,7 @@ import Data.Either
 :: Token
 	//Value tokens
 	= IdentToken [Char] // Identifier
-	| NumberToken Int   // Integer
+	| NumberToken [Char]// Integer
 	| CharToken Char    // Character literal
 	//Keyword tokens
 	| VarToken          // var keyword
@@ -44,6 +44,7 @@ import Data.Either
 	| AmpersandsToken   // &&
 	| PipesToken        // ||
     | ArrowToken        // ->
+	| EndOfFileToken    // EOF
 
 :: LexerOutput :== Either String [Token]
 
diff --git a/lex.icl b/lex.icl
index aa80f70..a1912bf 100644
--- a/lex.icl
+++ b/lex.icl
@@ -6,6 +6,7 @@ import StdString
 import System.CommandLine
 import StdFile
 import StdMisc
+import StdBool
 from StdFunc import id, const
 import Data.Maybe
 import Control.Applicative
@@ -16,266 +17,133 @@ from Data.Func import $
 from Text import class Text, instance Text String
 import qualified Text
 
+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 <<< print (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)
+
 lexer :: [Char] -> LexerOutput
-lexer _ = undef
+lexer [] = Right []
+lexer x = case lex x of
+	(Right t, rest) = lexer rest >>= \ts.Right [t:ts]
+	(Left e, _) = Left e
 
-instance toString LexerOutput where
-	toString (Left l) = "Error: " +++ l
-	toString (Right x) = 'Text'.concat (print 0 x)
+print :: LexerOutput -> String
+print (Left l) = "Error: " +++ l
+print (Right x) = 'Text'.concat (print` 0 x)
 	where
-		print :: Int [Token] -> [String]
-		print _ [] = []
-		print i [(IdentToken l):rest] = [toString l:print i rest]
-		print i [(NumberToken j):rest] = [toString j:print i rest]
-		print i [(CharToken c):rest] = ["'":toString c:"'":print i rest]
-		print i [VarToken:rest] = ["var":print i rest]
-		print i [VoidToken:rest] = ["Void":print i rest]
-		print i [ReturnToken:rest] = ["return":print i rest]
-		print i [IfToken:rest] = ["if":print i rest]
-		print i [ElseToken:rest] = ["else":print i rest]
-		print i [WhileToken:rest] = ["while":print i rest]
-		print i [TrueToken:rest] = ["True":print i rest]
-		print i [FalseToken:rest] = ["False":print i rest]
-		print i [BraceOpenToken:rest] = ["(":print i rest]
-		print i [BraceCloseToken:rest] = [")":print i rest]
-		print i [CBraceOpenToken:rest] = ["{\n":tab (i+1):print (i+1) rest]
-		print i [CBraceCloseToken:rest] = ["}\n":tab (i-1):print (i-1) rest]
-		print i [SquareOpenToken:rest] = ["[":print i rest]
-		print i [SquareCloseToken:rest] = ["]":print i rest]
-		print i [CommaToken:rest] = [", ":print i rest]
-		print i [ColonToken:rest] = [":":print i rest]
-		print i [SColonToken:rest] = [";\n":tab i:print i rest]
-		print i [DotToken:rest] = [".":print i rest]
-		print i [PlusToken:rest] = [" + ":print i rest]
-		print i [DashToken:rest] = [" - ":print i rest]
-		print i [StarToken:rest] = [" * ":print i rest]
-		print i [SlashToken:rest] = [" / ":print i rest]
-		print i [PercentToken:rest] = [" % ":print i rest]
-		print i [AssignmentToken:rest] = [" = ":print i rest]
-		print i [LesserToken:rest] = [" < ":print i rest]
-		print i [BiggerToken:rest] = [" > ":print i rest]
-		print i [ExclamationToken:rest] = ["!":print i rest]
-		print i [DoubleColonToken:rest] = [" :: ":print i rest]
-		print i [LesserEqToken:rest] = [" <= ":print i rest]
-		print i [GreaterEqToken:rest] = [" >= ":print i rest]
-		print i [EqualsToken:rest] = [" == ":print i rest]
-		print i [AmpersandsToken:rest] = [" && ":print i rest]
-		print i [PipesToken:rest] = [" || ":print i rest]
-		print i [ArrowToken:rest] = [" -> ":print i rest]
+		print` :: Int [Token] -> [String]
+		print` _ [] = []
+		print` i [(IdentToken l):rest] = [toString l:print` i rest]
+		print` i [(NumberToken j):rest] = [toString j:print` i rest]
+		print` i [(CharToken c):rest] = ["'":toString c:"'":print` i rest]
+		print` i [VarToken:rest] = ["var ":print` i rest]
+		print` i [VoidToken:rest] = ["Void":print` i rest]
+		print` i [ReturnToken:rest] = ["return":print` i rest]
+		print` i [IfToken:rest] = ["if":print` i rest]
+		print` i [ElseToken:rest] = ["else":print` i rest]
+		print` i [WhileToken:rest] = ["while":print` i rest]
+		print` i [TrueToken:rest] = ["True":print` i rest]
+		print` i [FalseToken:rest] = ["False":print` i rest]
+		print` i [BraceOpenToken:rest] = ["(":print` i rest]
+		print` i [BraceCloseToken:rest] = [")":print` i rest]
+		print` i [CBraceOpenToken:rest] = ["{\n":tab (i+1):print` (i+1) rest]
+		print` i [CBraceCloseToken:rest] = ["}\n":tab i:print` i rest]
+		print` i [SquareOpenToken:rest] = ["[":print` i rest]
+		print` i [SquareCloseToken:rest] = ["]":print` i rest]
+		print` i [CommaToken:rest] = [", ":print` i rest]
+		print` i [ColonToken:rest] = [":":print` i rest]
+		print` i [SColonToken:CBraceCloseToken:rest] =
+			[";\n":tab (i-1):"}\n":print` (i-1) rest]
+		print` i [SColonToken:rest] = [";\n":tab i:print` i rest]
+		print` i [DotToken:rest] = [".":print` i rest]
+		print` i [PlusToken:rest] = [" + ":print` i rest]
+		print` i [DashToken:rest] = [" - ":print` i rest]
+		print` i [StarToken:rest] = [" * ":print` i rest]
+		print` i [SlashToken:rest] = [" / ":print` i rest]
+		print` i [PercentToken:rest] = [" % ":print` i rest]
+		print` i [AssignmentToken:rest] = [" = ":print` i rest]
+		print` i [LesserToken:rest] = [" < ":print` i rest]
+		print` i [BiggerToken:rest] = [" > ":print` i rest]
+		print` i [ExclamationToken:rest] = ["!":print` i rest]
+		print` i [DoubleColonToken:rest] = [" :: ":print` i rest]
+		print` i [LesserEqToken:rest] = [" <= ":print` i rest]
+		print` i [GreaterEqToken:rest] = [" >= ":print` i rest]
+		print` i [EqualsToken:rest] = [" == ":print` i rest]
+		print` i [AmpersandsToken:rest] = [" && ":print` i rest]
+		print` i [PipesToken:rest] = [" || ":print` i rest]
+		print` i [ArrowToken:rest] = [" -> ":print` i rest]
+		print` i [EndOfFileToken:rest] = ["\n":print` i rest]
 
 tab :: Int -> String
 tab 0 = ""
 tab i = "\t" +++ tab (i-1)
 
-lex :: [Char] -> LexerOutput
-lex ['v':'a':'r':rest] = undef
-lex ['V':'o':'i':'d':rest] = undef
-lex ['r':'e':'t':'u':'r':'n':rest] = undef
-lex ['i':'f':rest] = undef
-lex ['e':'l':'s':'e':rest] = undef
-lex ['w':'h':'i':'l':'e':rest] = undef
-lex ['T':'r':'u':'e':rest] = undef
-lex ['F':'a':'l':'s':'e':rest] = undef
-lex [':':':':rest] = undef
-lex ['<':'=':rest] = undef
-lex ['>':'=':rest] = undef
-lex ['=':'=':rest] = undef
-lex ['&':'&':rest] = undef
-lex ['|':'|':rest] = undef
-lex ['-':'>':rest] = undef
-lex ['(':rest] = undef
-lex [')':rest] = undef
-lex ['{':rest] = undef
-lex ['{':rest] = undef
-lex ['[':rest] = undef
-lex [':rest]':rest] = undef
-lex [',':rest] = undef
-lex [':':rest] = undef
-lex [';':rest] = undef
-lex ['.':rest] = undef
-lex ['+':rest] = undef
-lex ['-':rest] = undef
-lex ['*':rest] = undef
-lex ['/':rest] = undef
-lex ['%':rest] = undef
-lex ['=':rest] = undef
-lex ['<':rest] = undef
-lex ['>':rest] = undef
-lex ['!':rest] = undef
+
+lex :: [Char] -> (Either String Token, [Char])
+lex [] = (Right EndOfFileToken, [])
+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 ['\'':'\\':x:'\'':rest] = case x of
-	'a' = undef // (CharToken '\a')
-	'b' = undef // (CharToken '\b')
-	'f' = undef // (CharToken '\f')
-	'n' = undef // (CharToken '\n')
-	'r' = undef // (CharToken '\r')
-	't' = undef // (CharToken '\t')
-	'v' = undef // (CharToken '\v')
-	_ = Left ("Illegal escape: \\" +++ toString x)
-lex ['\'':x:'\'':rest] = undef
+	'a' = (Right (CharToken (toChar 7)), rest) //Alarm
+	'b' = (Right (CharToken '\b'), rest) //Backspace
+	'f' = (Right (CharToken '\f'), rest) //Formfeed
+	'n' = (Right (CharToken '\n'), rest) //Newline
+	'r' = (Right (CharToken '\r'), rest) //Carriage Return
+	't' = (Right (CharToken '\t'), rest) //Horizontal tab
+	'v' = (Right (CharToken '\v'), rest) //Vertical tab
+	_ = (Left ("Unknown escape: \\" +++ toString x), rest)
+lex ['\'':x:'\'':rest] = (Right (CharToken x), rest)
+lex [':':':':rest] = (Right DoubleColonToken, 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 ['(':rest] = (Right BraceOpenToken, rest)
+lex [')':rest] = (Right BraceCloseToken, rest)
+lex ['{':rest] = (Right CBraceOpenToken, rest)
+lex ['}':rest] = (Right CBraceCloseToken, rest)
+lex ['[':rest] = (Right SquareOpenToken, rest)
+lex [']':rest] = (Right SquareCloseToken, rest)
+lex [',':rest] = (Right CommaToken, rest)
+lex [':':rest] = (Right ColonToken, rest)
+lex [';':rest] = (Right SColonToken, rest)
+lex ['.':rest] = (Right DotToken, rest)
+lex ['+':rest] = (Right PlusToken, rest)
+lex ['-':rest] = (Right DashToken, rest)
+lex ['*':rest] = (Right StarToken, rest)
+lex ['/':rest] = (Right SlashToken, rest)
+lex ['%':rest] = (Right PercentToken, rest)
+lex ['=':rest] = (Right AssignmentToken, rest)
+lex ['<':rest] = (Right LesserToken, rest)
+lex ['>':rest] = (Right BiggerToken, rest)
+lex ['!':rest] = (Right ExclamationToken, rest)
 lex [x:xs]
 | isSpace x = lex xs
-| isDigit x = undef //Parse Int
-| isAlpha x = undef //Parse ident
-| otherwise = Left ("Unexpected character: " +++ toString x)
-
-:: LexerOutput :== Either String [Token]
-
-Start = toString sp
-	where
-		sp :: LexerOutput
-		sp = Right [
-			WhileToken,
-			BraceOpenToken,
-			TrueToken,
-			BraceCloseToken,
-			CBraceOpenToken,
-			VarToken,
-			IdentToken ['x'],
-			AssignmentToken,
-			IdentToken ['x'],
-			PlusToken,
-			NumberToken 5,
-			SColonToken,
-			CBraceCloseToken]
-
-//:: LexerOutput a :== Either String a
-//
-//
-//runParser :: (Parser a) [Char] -> (LexerOutput a, [Char])
-//runParser (Parser p) s = p s
-//
-//lexer :: [Char] -> LexerOutput [Token]
-//
-////lexer functions
-//identT  = alpha >>= \a -> many (char '_' <|> alphaNum) >>= \as -> return $ IdentToken [a:as]
-//numberT = optional (char '-') >>= \sign -> (some digit) >>= \n -> case sign of
-//            Nothing -> return $ NumberToken $ 5  //fromString n
-//            _       -> return $ NumberToken $ -5 //(fromString n) * -1
-//charLT  = CharToken <$> (char '\'' *> item <* char '\'')
-//char2T  = item >>= \c1 -> case c1 of
-//            ':' = char ':' >>| return DoubleColonToken
-//            '<' = char '=' >>| return LesserEqToken
-//            '>' = char '=' >>| return GreaterEqToken
-//            '=' = char '=' >>| return EqualsToken
-//            '&' = char '&' >>| return AmpersandsToken
-//            '|' = char '|' >>| return PipesToken
-//            '-' = char '>' >>| return ArrowToken
-//            _   = zero
-//char1T  = item >>= \c1 -> findT c1 charTokenMap
-//varT    = string (fromString "var") >>| return VarToken
-//voidT   = string (fromString "Void") >>| return VoidToken
-//returnT = string (fromString "return") >>| return ReturnToken
-//ifT     = string (fromString "if") >>| return IfToken
-//elseT   = string (fromString "else") >>| return ElseToken
-//whileT  = string (fromString "while") >>| return WhileToken
-//trueT   = string (fromString "True") >>| return TrueToken
-//falseT  = string (fromString "False") >>| return FalseToken
-////note, for the anyToken parser the order matters!
-//anyT    = char2T <|> char1T <|> varT <|> voidT <|> returnT <|> ifT <|> elseT <|> whileT <|>
-//          trueT <|> falseT <|> numberT <|> identT <|> charLT
-//
-//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)
-//
-//
-//
-//charTokenMap =  [('(', BraceOpenToken)
-//                ,(')', BraceCloseToken)
-//                ,('{', CBraceOpenToken)
-//                ,('}', CBraceCloseToken)
-//                ,('[', SquareOpenToken)
-//                ,(']', SquareCloseToken)
-//                ,(',', CommaToken)
-//                ,(':', ColonToken)
-//                ,(';', SColonToken)
-//                ,('.', DotToken)
-//                ,('+', PlusToken)
-//                ,('-', DashToken)
-//                ,('*', StarToken)
-//                ,('/', SlashToken)
-//                ,('%', PercentToken)
-//                ,('=', AssignmentToken)
-//                ,('<', LesserToken)
-//                ,('>', BiggerToken)
-//                ,('!', ExclamationToken)]
-//findT c []           = fail "Unrecognized character"
-//findT c [(k,v):xs]   = if (c==k) (return v) (findT c xs)
-//
-//
-//// Clean adaption of Yard, a parsec like parser combinator
-//:: Parser a = Parser ([Char] -> (LexerOutput a, [Char]))
-//
-//runParser :: (Parser a) [Char] -> (LexerOutput a, [Char])
-//runParser (Parser p) s = p s
-//
-//instance Functor Parser where
-//    fmap f s    = liftM f s
-//
-//instance Applicative Parser where
-//    pure a      = Parser $ \s -> (Right a, s) 
-//    (<*>) sf s  = ap sf s
-//
-//instance Monad Parser where
-//    bind p f    = Parser $ \s -> let (out, rest) = runParser p s in case out of
-//                    Left e  = (Left e, rest)
-//                    Right t = runParser (f t) rest
-//
-////gives us some, many and optional
-//instance Alternative Parser where
-//    empty       = zero
-//    (<|>) p1 p2 = Parser $ \s -> let (out, rest) = runParser p1 s in case out of
-//                    Left e  = runParser p2 s
-//                    Right t = (Right t, rest)
-//
-////parser that fails with error
-//fail :: String -> Parser a
-//fail e = Parser $ \s -> (Left e, s)
-//
-////parser that always fails
-//zero :: Parser a
-//zero = fail "Zero parser"
-//
-////matches exactly one Char
-//item :: Parser Char
-//item = Parser $ \s -> case s of 
-//        []      = (Left "Unexpected empty input", s)
-//        [x:xs]  = (Right x, xs)
-//
-////matches any char which satisfies f
-//satisfy :: (Char -> Bool) -> Parser Char
-//satisfy f = item >>= (\r -> if (f r) (return r) zero)
-//
-////tries a parser, if it fails returns a default value
-//optionalDef :: a (Parser a) -> Parser a
-//optionalDef def p = p <|> return def
-//
-////matched given char
-//char :: Char -> Parser Char
-//char c = satisfy (\i -> c==i) //I hate that we can't do: satisfy (==c)
-//
-//alpha :: Parser Char
-//alpha = satisfy isAlpha
-//
-//digit :: Parser Char
-//digit = satisfy isDigit
-//
-//alphaNum :: Parser Char
-//alphaNum = alpha <|> digit
-//
-////matches a given String
-//string :: [Char] -> Parser [Char]
-//string s = mapM_ char s >>| return s
+| isDigit x
+	# (is, rest) = span isDigit xs
+	= (Right (NumberToken [x:is]), rest)
+| isAlpha x
+	# (is, rest) = span (\c.isAlphanum c || c == '_') xs
+	= (Right (IdentToken [x:is]), rest)
+| otherwise = (Left ("Unexpected character: " +++ toString x), [])
-- 
2.20.1