- 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), [])
+ 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 get char escapes of
+ Just e = LexToken 4 (CharToken e)
+ Nothing = LexItemError $ "Unknown escape: " +++ toString char
+
+ lexString :: Parser Char LexItem
+ lexString = item '"' *> (
+ many (
+ (satisfy (\c->c <> '"' && c <> '\\')) <|>
+ (item '\\' *> top >>= \char->case get char escapes of
+ Just e = pure e
+ Nothing = empty)
+ ))<* item '"' >>= \cs-> pure $ LexToken (length cs) (StringToken cs)