-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), [])
repositories / cc1516.git / blobdiff