X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=lex.icl;h=a1912bf959b332f43a0a731d5009886716bf4827;hb=8de73bb36ae068011c2c1b1fc9b3c9091a897997;hp=f050062d7f172760b708a867a469d06cba3dc75c;hpb=19c5f39c61f1692641570dc3cf13360e7dff5cdf;p=cc1516.git diff --git a/lex.icl b/lex.icl index f050062..a1912bf 100644 --- a/lex.icl +++ b/lex.icl @@ -1,3 +1,149 @@ -module lex +implementation module lex -Start = "Hello World!\n" +import Data.Either +import Data.List +import StdString +import System.CommandLine +import StdFile +import StdMisc +import StdBool +from StdFunc import id, const +import Data.Maybe +import Control.Applicative +import Control.Monad +import Control.Monad.State +import Data.Functor +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 [] = Right [] +lexer x = case lex x of + (Right t, rest) = lexer rest >>= \ts.Right [t:ts] + (Left e, _) = Left e + +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: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] -> (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' = (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 + # (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), [])