X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=lex.icl;h=aa34987969b5afcdc71c83451f91fe448ee9902f;hb=bf8de26a347182ab0de1aa45a5cc3fdf6c320c21;hp=cc4bc2f9a46eaa6fcc1074971d9ab902c9fbc848;hpb=9b74ace948b5035934d377a712eddda653bc640e;p=cc1516.git

diff --git a/lex.icl b/lex.icl
index cc4bc2f..aa34987 100644
--- a/lex.icl
+++ b/lex.icl
@@ -1,32 +1,118 @@
 implementation module lex
 
-import Data.Either
-import Data.List
+import Control.Monad, Control.Applicative
+import Data.Either, Data.Func, Data.Void
+from StdFunc import o
+import StdBool
+import StdList
+import StdChar
 import StdString
-import System.CommandLine
-import StdFile
-import StdMisc
+import StdTuple
 
-// Misschien moeten we hier continuation style van maken
-instance toString lexerOutput where
-	toString l = "dit is een lexer output, danwel error\n"
+import yard
+import AST
+
+:: LexItem
+	= LexToken Int TokenValue
+	| LexSpace Int Int
+	| LexNL
+	| LexEOF
+	| LexItemError String
 
 lexer :: [Char] -> LexerOutput
-lexer _ = Left "Not Implemented"
-
-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
+lexer r = fst $ runParser (lexProgram 1 1) r
+
+lexProgram :: Int Int -> Parser Char [Token]
+lexProgram line column = lexToken >>= \t->case t of
+	LexEOF = pure []
+	LexNL = lexProgram (line+1) 1
+	(LexSpace l c) = lexProgram (line+l) (column+c)
+	(LexItemError e) = fail <?>
+		PositionalError line column ("LexerError: " +++ e)
+	(LexToken c t) = lexProgram line (column+c)
+		>>= \rest->pure [({line=line,col=column}, t):rest]
+
+lexToken :: Parser Char LexItem
+lexToken =
+	//Comments
+	lexBlockComment <|> lexComment <|>
+	//Keyword tokens
+	lexKw "var" VarToken <|> lexKw "Void" VoidToken <|>
+	lexKw "return" ReturnToken <|> lexKw "if" IfToken <|>
+	lexKw "else" ElseToken <|> lexKw "while" WhileToken <|>
+	lexKw "True" TrueToken <|> lexKw "False" FalseToken <|>
+	lexKw "Int" IntTypeToken <|> lexKw "Bool" BoolTypeToken <|>
+	lexKw "Char" CharTypeToken <|>
+	//Character tokens
+	lexEscape <|> lexCharacter <|>
+	//Two char ops tokens
+	lexWord "::" DoubleColonToken <|> lexWord "!=" NotEqualToken <|>
+	lexWord "<=" LesserEqToken <|> lexWord ">=" GreaterEqToken <|>
+	lexWord "==" EqualsToken <|> lexWord "&&" AmpersandsToken <|>
+	lexWord "||" PipesToken <|> lexWord "[]" EmptyListToken <|>
+	lexWord "->" ArrowToken <|>
+	//One char ops tokens
+    lexWord "(" BraceOpenToken <|> lexWord ")" BraceCloseToken <|>
+	lexWord "{" CBraceOpenToken <|> lexWord "}" CBraceCloseToken <|>
+	lexWord "[" SquareOpenToken <|> lexWord "]" SquareCloseToken <|>
+	lexWord "," CommaToken <|> lexWord ":" ColonToken <|>
+	lexWord ";" SColonToken <|> lexWord "." DotToken <|>
+	lexWord "+" PlusToken <|> lexWord "*" StarToken <|>
+	lexWord "/" SlashToken <|> lexWord "%" PercentToken <|>
+	lexWord "=" AssignmentToken <|> lexWord "<" LesserToken <|>
+	lexWord ">" BiggerToken <|> lexWord "!" ExclamationToken <|>
+	lexWord "-" DashToken <|>
+	//Number and identifier tokens
+	lexNumber <|> lexIdentifier <|>
+	(item '\n' >>| pure LexNL) <|>
+	//Whitespace
+	(satisfy isSpace >>| (pure $ LexSpace 0 1)) <|>
+	(eof >>| pure LexEOF)
 	where
-		readEntireFile :: *File -> *([Char], *File)
-		readEntireFile f
-		# (b, c, f) = freadc f
-		| not b = ([], f)
-		# (cs, f) = readEntireFile f
-		= ([c:cs], f)
+		lexWord :: String TokenValue -> Parser Char LexItem
+		lexWord s tv = list ls >>| pure (LexToken (length ls) tv)
+			where ls = fromString s
+
+		lexKw :: String TokenValue -> Parser Char LexItem
+		lexKw kw tv = lexWord kw tv <* check (not o isIdentChar)
+
+		lexComment :: Parser Char LexItem
+		lexComment = list (fromString "//") 
+			>>| top until (eof <|> (item '\n' >>| pure Void)) >>| pure LexNL
+
+		lexBlockComment :: Parser Char LexItem
+		lexBlockComment = list (fromString "/*")
+			>>| (top until (list (fromString "*/")))
+			>>= \chars->pure $ widthHeight chars 0 0
+			where
+				widthHeight :: [Char] Int Int -> LexItem
+				widthHeight [] l c = LexSpace l c
+				widthHeight ['\n':xs] l _ = widthHeight xs (l+1) 0
+				widthHeight [x:xs] l c = widthHeight xs l (c+1)
+
+		lexNumber :: Parser Char LexItem
+		lexNumber = some (satisfy isDigit) >>= \si->pure $
+			LexToken (length si) (NumberToken $ toInt $ toString si)
+
+		lexIdentifier :: Parser Char LexItem
+		lexIdentifier = some (satisfy isIdentChar)
+			>>= \si->pure $ LexToken (length si) (IdentToken $ toString si)
+
+		isIdentChar c = isAlphanum c || c == '_'
+
+		lexCharacter :: Parser Char LexItem
+		lexCharacter = item '\'' *> satisfy ((<>) '\'') <* item '\''
+			>>= \char->pure $ LexToken 3 (CharToken char)
+
+		lexEscape :: Parser Char LexItem
+		lexEscape = item '\'' *> item '\\' *> top <* item '\''
+			>>= \char->pure case char of
+				'a' = LexToken 4 (CharToken $ toChar 7)
+				'b' = LexToken 4 (CharToken '\b')
+				'b' = LexToken 4 (CharToken '\b')
+				'f' = LexToken 4 (CharToken '\f')
+				'n' = LexToken 4 (CharToken '\n')
+				'r' = LexToken 4 (CharToken '\t')
+				'v' = LexToken 4 (CharToken '\v')
+				'\'' =LexToken 4 (CharToken '\'')
+				c = (LexItemError $ "Unknown escape: " +++ toString c)