X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=lex.icl;h=e2d679af2a693788fcdcf6c2689ccc96ca0193b5;hb=cb70ae497fc6e5d597b2e1fb5dad758ce15e3ba5;hp=2eeb6007c23d2b4188797f98b68937d25c1ec0a4;hpb=889d4798a0da64d76422da98378f5e5c35f0bf32;p=cc1516.git diff --git a/lex.icl b/lex.icl index 2eeb600..e2d679a 100644 --- a/lex.icl +++ b/lex.icl @@ -1,29 +1,25 @@ implementation module lex -from Text import class Text, instance Text String import Control.Monad -import Data.Either -import Data.Functor -import Data.List +import Data.Either, Data.Maybe, Data.Map, Data.Func import StdString +import StdTuple import StdBool -import StdFile -import System.CommandLine -import qualified Text +import StdList +import StdChar -Start :: *World -> *World -Start w -# (out, w) = stdio w -# (toparse, out) = readEntireFile out -# (_, w) = fclose (out <<< "\n" <<< toString (lexer toparse)) w -= w +SingleCharTokens :: Map Char Token +SingleCharTokens = fromList [ + ('(', BraceOpenToken), (')', BraceCloseToken), ('{', CBraceOpenToken), + ('}', CBraceCloseToken), ('[', SquareOpenToken), (']', SquareCloseToken), + (',', CommaToken), (':', ColonToken), (';', SColonToken), + ('.', DotToken), ('+', PlusToken), ('*', StarToken), ('/', SlashToken), + ('%', PercentToken), ('=', AssignmentToken), ('<', LesserToken), + ('>', BiggerToken), ('!', ExclamationToken)] -readEntireFile :: *File -> *([Char], *File) -readEntireFile f -# (b, c, f) = freadc f -| not b = ([], f) -# (cs, f) = readEntireFile f -= ([c:cs], f) +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 [] = Right [] @@ -31,128 +27,42 @@ lexer x = case lex x of (Right t, rest) = lexer rest >>= \ts.Right [t:ts] (Left e, _) = Left e -untilNext :: [Char] -> [Char] -untilNext [] = [] -untilNext ['*':'/':rest] = rest -untilNext [x:rest] = untilNext rest - lex :: [Char] -> (Either String Token, [Char]) lex [] = (Right EndOfFileToken, []) -//Comments -lex ['/':'/':rest] = lex (tl (dropWhile ((<>) '\n') rest)) -lex ['/':'*':rest] = lex (untilNext rest) -//Keyword tokens -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) -//Two character tokens -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) -//One character tokens -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) -//Value tokens -lex ['\'':x:'\'':rest] = (Right (CharToken x), rest) -lex ['\'':'\\':x:'\'':rest] = case x of - '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 +lex ['/':'/':xs] = lex $ dropWhile ((<>) '\n') xs +lex ['/':'*':xs] = + lex $ tl $ map snd $ dropWhile ((<>) ('*', '/')) $ zip2 [zero:xs] xs +lex ['v':'a':'r':xs] = (Right VarToken, xs) +lex ['V':'o':'i':'d':xs] = (Right VoidToken, xs) +lex ['r':'e':'t':'u':'r':'n':xs] = (Right ReturnToken, xs) +lex ['i':'f':xs] = (Right IfToken, xs) +lex ['e':'l':'s':'e':xs] = (Right ElseToken, xs) +lex ['w':'h':'i':'l':'e':xs] = (Right WhileToken, xs) +lex ['T':'r':'u':'e':xs] = (Right TrueToken, xs) +lex ['F':'a':'l':'s':'e':xs] = (Right FalseToken, xs) +lex ['I':'n':'t':xs] = (Right IntTypeToken, xs) +lex ['C':'h':'a':'r':xs] = (Right CharTypeToken, xs) +lex ['B':'o':'o':'l':xs] = (Right BoolTypeToken, xs) +lex [':':':':xs] = (Right DoubleColonToken, xs) +lex ['!':'=':xs] = (Right NotEqualToken, xs) +lex ['<':'=':xs] = (Right LesserEqToken, xs) +lex ['>':'=':xs] = (Right GreaterEqToken, xs) +lex ['=':'=':xs] = (Right EqualsToken, xs) +lex ['&':'&':xs] = (Right AmpersandsToken, xs) +lex ['|':'|':xs] = (Right PipesToken, xs) +lex ['-':'>':xs] = (Right ArrowToken, xs) +lex ['\'':x:'\'':xs] = (Right (CharToken x), xs) +lex ['\'':'\\':x:'\'':xs] = case get x EscapeMap of + Just t = (Right (CharToken t), xs) _ = (Left ("Unknown escape: \\" +++ toString x), []) -lex [x:xs] -| isSpace x = lex xs -| isDigit x = let (is, rest) = span isDigit xs in - (Right (NumberToken [x:is]), rest) -| isAlpha x = let (is, rest) = span (\c.isAlphanum c || c == '_') xs in - (Right (IdentToken [x:is]), rest) -| otherwise = (Left ("Unexpected character: " +++ toString x), []) - -instance toString LexerOutput where - toString (Left l) = "Error: " +++ l - toString (Right x) = 'Text'.concat (print 0 x) - -tab :: Int -> [String] -tab i = replicate i "\t" - -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 [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 [VoidToken:rest] = ["Void":print i rest] -print i [IntTypeToken:rest] = ["Int":print i rest] -print i [CharTypeToken:rest] = ["Char":print i rest] -print i [BoolTypeToken:rest] = ["Bool":print i rest] -print i [DoubleColonToken:rest] = [" :: ":print i rest] -print i [NotEqualToken: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 [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] = case rest of - [CBraceCloseToken:_] = ["}\n":tab (i-2)] ++ print (i-1) 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] = case rest of - [CBraceCloseToken:_] = [";\n":tab (i-1)] ++ print i 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 [EndOfFileToken:rest] = ["\n":print i rest] +lex ['-':t=:[x:xs]] +| isDigit x = let (i, r) = span isDigit t in (Right (NumberToken ['-':i]), r) +| otherwise = (Right DashToken, xs) +lex t=:[x:xs] = case get x SingleCharTokens of + (Just tok) = (Right tok, xs) + Nothing + | isSpace x = lex xs + | isDigit x = let (i, r) = span isDigit t in (Right (NumberToken i), r) + | isAlpha x = let (i, r) = span isIdent t in (Right (IdentToken i), r) + with isIdent c = isAlphanum c || c == '_' + | otherwise = (Left ("Unexpected character: " +++ toString x), [])