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cleo.hs
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cleo.hs
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module Main where
import IO hiding(try)
import Monad
import Data.Char (isSymbol, isPunctuation, isSpace)
import Data.List (concat, isPrefixOf, findIndex)
import System.Console.GetOpt
--import Test.QuickCheck
import Text.ParserCombinators.Parsec hiding (Parser)
import System.Environment.UTF8
--import System.Console.Readline
--import Data.Decimal
--import LLVM.Core
--import LLVM.ExecutionEngine
-- tokens
data Item = Symbol String
| InfixOperator String
| PrefixOperator String
| PostfixOperator String
| Integer String
| Float String
| Binary String
| Hexadecimal String
| Octal String
| String String
| DoubleString String
| Backtick String
| Comment String
| PostComment String
deriving Show
-- block delimiter types
data Delim = Parens
| Square
| Curly
| Indent
deriving Show
-- tokens + indented delimiters
type Token = (SourcePos, Tok)
data Tok = Token Item
| Begin Delim
| End Delim
deriving Show
-- parsed elements
data Element = Element Item
| List [Element]
| SquareBracketList [Element]
| CurlyBraceList [Element]
deriving Show
type Parser a = GenParser Char () a
type IndentParser a = GenParser Token () a
-- Top-level parser functions
main :: IO ()
main = do
args <- getArgs
let filename = args !! 0
parseFile filename
parseFile :: String -> IO ()
parseFile filename = do
--putStrLn (readExpr (args !! 0) "input")
str <- readFile filename
putStrLn (readExpr str filename)
readExpr :: String -> String -> String
readExpr input inputName =
let tokens = case runParser parseTokens () inputName (input ++ "\n") of
Left err -> fail $ "No match: " ++ show err
Right val -> val
in case runParser parseModule () inputName tokens of
Left err -> "No match: " ++ show err
Right val -> "Found value: " ++ show val
-- * Indented list parsing
parseTokens :: Parser [Token]
parseTokens = parseLines [] [""]
parseLines :: [Token] -> [String] -> Parser [Token]
parseLines tokens indentStack = do
option [] (parseLiterateComment tokens indentStack
<|> parseTokenLines tokens indentStack)
return tokens
-- Unindented lines are literate comments
parseLiterateComment :: [Token] -> [String] -> Parser [Token]
parseLiterateComment tokens indentStack = do
lines <- many1 parseLiterateCommentLine
parseLines (tokens ++ [Token $ Comment (concat lines)]) indentStack
<?> "Literate comment"
parseLiterateCommentLine :: Parser String
parseLiterateCommentLine = do
-- make sure this line is unindented
notFollowedBy spaceLine
line <- many1 (notFollowedBy eol >> anyChar)
eol_ <- eol
return $ line ++ eol_
<?> "Literate comment line"
parseTokenLines :: [Token] -> [String] -> Parser [Token]
parseTokenLines tokens indentStack = do
indent <- spacesLine1
elements <- parseListElementsLine
case elements of
(_:[]) -> case getIndentTokens indentStack indent of
Right (indentTokens, updatedStack) ->
parseLines (indentTokens ++ elements) updatedStack
Left err -> fail err
otherwise -> parseLines tokens indentStack
getIndentTokens :: [String] -> String -> Either String ([Token], [String])
getIndentTokens indentStack indent =
let (dedents, updatedStack) = break (\i -> indent `isPrefixOf` i && indent /= i) indentStack in
if head updatedStack == indent then
Right (replicate (length dedents) (End Indent), updatedStack)
else if head updatedStack `isPrefixOf` indent then
Right (replicate (length dedents) (End Indent) ++ [Begin Indent], indent:updatedStack)
else
Left "Inconsistent whitespace usage in indentation"
-- whitespace parsing
eol :: Parser String
eol = string "\n"
<|> do
a <- string "\r"
b <- option "" (string "\n")
return $ a ++ b
<?> "eol"
spaces1 :: Parser ()
spaces1 = skipMany1 space
spaceLine :: CharParser st Char
spaceLine = satisfy (\c -> c /= '\n' && c /= '\r' && isSpace(c))
spacesLine :: Parser String
spacesLine = many spaceLine
spacesLine1 :: Parser String
spacesLine1 = many1 spaceLine
parseSymbol :: Parser [Token]
parseSymbol = do
first <- letter <|> char '_'
rest <- many (letter <|> digit <|> char '_')
let symbol = first : rest
return [Token $ Symbol symbol]
<?> "Symbol"
parseIndentedString :: Parser [Token]
parseIndentedString = do
preComments <- many parseNestedLiterateComment
indent <- spacesLine1
str <- many (notFollowedBy eol >> anyChar)
eol_ <- eol
rest <- many (parseIndentedStringLine indent)
return $ (concat preComments) ++ [Token $ String (str++eol_)] ++ (concat rest)
parseIndentedStringLine :: String -> Parser [Token]
parseIndentedStringLine indent = try $ do
string indent
str <- many (notFollowedBy eol >> anyChar)
eol_ <- eol
postComments <- many parseNestedLiterateComment
return $ (Token (String (str++eol_))) : (concat postComments)
parseQuoted :: Parser [Token]
parseQuoted = do
char '\''
string <- (((try (string "''" >> eol)) >> parseIndentedString)
<|> do
string <- many $ (notFollowedBy (string "'" <|> eol) >> anyChar) <|> try (string "''" >> return '\'')
char '\''
return [Token $ String string])
return string
parseDoubleQuoted :: Parser [Token]
parseDoubleQuoted = do
char '"'
string <- (((try (string "''" >> eol)) >> parseIndentedString)
<|> do
string <- many $ (notFollowedBy (string "\"" <|> eol) >> anyChar) <|> try (string "\"\"" >> return '"')
char '"'
return [Token $ String string])
return string
parseBacktickQuoted :: Parser String
parseBacktickQuoted = do
char '`'
x <- many $ noneOf "`\n" <|> try (string "``" >> return '`')
char '`'
return x
<?> "Backquoted Operator"
parseOperatorString :: Parser String
parseOperatorString = do
operator <- parseBacktickQuoted
<|> (many1 (satisfy (\c ->
c /= '(' && c /= ')' &&
c /= '{' && c /= '}' &&
c /= '[' && c /= ']' &&
c /= '\'' && c /= '"' && c /= '`' &&
c /= '_' &&
(isSymbol c || isPunctuation c))) <?> "InfixOperator")
return operator
<?> "InfixOperator"
parseCommentString :: Parser String
parseCommentString = do
try $ string "\\\\"
comment <- many ((notFollowedBy eol) >> anyChar)
eol_ <- eol
return $ comment ++ eol_
<?> "Comment"
parseComment :: Parser [Token]
parseComment = do
comment <- parseCommentString
return $ [Token $ Comment comment]
parsePostComment :: Parser [Token]
parsePostComment = do
comment <- parseCommentString
return $ [Token (PostComment comment)]
-- parse a single line of elements
parseListElementsLine :: Parser [Token]
parseListElementsLine = do
parseComment
<|> do
elements <- sepEndBy parseElementCluster spacesLine1
postComment <- option [] parsePostComment
return $ (concat elements) ++ postComment
parseElementCluster :: Parser [Token]
parseElementCluster = parsePrefixInfix <|> parseFirstItem
parsePrefixInfix :: Parser [Token]
parsePrefixInfix = do
op <- parseOperatorString
item <- option [] parseItem
case item of
(_:[]) -> do
more <- many parseInfixPostfix
return $ (Token $ PrefixOperator op) : (item ++ (concat more))
otherwise -> do
return $ [Token $ InfixOperator op]
parseFirstItem :: Parser [Token]
parseFirstItem = do
item <- parseItem
more <- many parseInfixPostfix
return $ item ++ (concat more)
parseInfixPostfix :: Parser [Token]
parseInfixPostfix = do
op <- parseOperatorString
item <- option [] parseItem
return $ case item of
(_:[]) -> (Token $ InfixOperator op) : item
otherwise -> [Token $ PostfixOperator op]
parseItem :: Parser [Token]
parseItem = do
item <- (parseQuoted
<|> parseDoubleQuoted
<|> parseNumber
<|> parseSymbol
<|> parseList
<|> parseSquareBracketList
<|> parseCurlyBraceList)
return item
parseNestedLiterateComment :: Parser [Token]
parseNestedLiterateComment = do
lines <- many1 parseLiterateCommentLine
return [Token $ Comment (concat lines)]
<?> "Literate comment"
parseNestedTokenLine :: Parser [Token]
parseNestedTokenLine = do
indent <- spacesLine1
elements <- parseListElementsLine
return elements
parseList :: Parser [Token]
parseList = do
begin <- char '('
elements <- many (parseNestedLiterateComment
<|> parseNestedTokenLine)
end <- char ')'
return $ concat elements
parseSquareBracketList :: Parser [Token]
parseSquareBracketList = do
begin <- char '['
elements <- many (parseNestedLiterateComment
<|> parseNestedTokenLine)
end <- char ']'
return $ concat elements
parseCurlyBraceList :: Parser [Token]
parseCurlyBraceList = do
begin <- char '{'
elements <- many (parseNestedLiterateComment
<|> parseNestedTokenLine)
end <- char '}'
return $ concat elements
-- Tokenizer Functions
--
satisfyToken :: (Token -> Maybe a) -> Parser a
satisfyToken test
= token showToken posToken testToken
where
showToken (pos,tok) = show tok
posToken (pos,tok) = pos
testToken (pos,tok) = test tok
tokenEquals :: Parser a
tokenEquals = satisfyToken (==)
-- IndentParser Functions
parseModule :: IndentParser Element
parseModule = do
elements <- many parseElement
return $ List elements
parseElement :: IndentParser Element
parseElement = parseIndentedList <|> parseItemElement
parseItemElement :: IndentParser Element
parseItemElement = tokenEquals Element
parseIndentedList :: IndentParser Element
parseIndentedList = do
tokenEquals $ Begin Indent
elements <- manyTill parseElement (tokenEquals $ End Indent)
return $ List elements
<?> "Indented List"
-- Numeric literals
parseNumber :: Parser [Token]
parseNumber = do
-- parse a 0 then the number
char '0'
num <- zeroNumFloat
return [num]
-- or parse a decimal/float
<|> decimalFloat ""
<?> "Number"
zeroNumFloat :: Parser Token
zeroNumFloat = do
-- try to parse an integer in hex/octal/binary format
hexadecimal
<|> octal
<|> binary
-- or parse a decimal/float, e.g. 1.2e10
<|> decimalFloat "0"
-- or parse a fract/float, e.g. .2e10
<|> fractFloat "0"
-- if all that fails this must be "just" a 0
<|> return [Token $ Integer "0"]
decimalFloat :: String -> Parser Token
decimalFloat zero = do
-- try to parse a decimal
num <- decimal
let znum = zero ++ num
-- see if there's a trailing fractional component
option (Token $ Integer num) (fractFloat znum)
fractFloat :: String -> Parser Token
fractFloat num = do
-- parse the fractional part
char '.'
fract <- many1 digit
exp <- option "" exponent'
return $ Token $ Float $ num ++ "." ++ fract ++ exp
<|>
-- just parse the exponent part (e.g. 0e-10)
do exp <- exponent'
return $ Token $ Float (num ++ exp)
exponent' :: Parser String
exponent' = do
e <- oneOf "eE"
s <- sign
exp <- decimal <?> "exponent"
return $ e : s ++ exp
<?> "exponent"
sign :: Parser String
sign = option ("") (string "-" <|> string "+") <?> "Exponent Sign"
decimal :: Parser String
decimal = many1 digit
hexadecimal :: Parser Token
hexadecimal = do
x <- oneOf "xX"
hex <- many1 hexDigit
return $ Token $ Hexadecimal ('0' : x : hex)
<?> "Hexadecimal Integer"
octal :: Parser Token
octal = do
o <- oneOf "oO"
oct <- many1 octDigit
return $ Token $ Octal ('0' : o : oct)
<?> "Octal Integer"
binary :: Parser Token
binary = do
b <- oneOf "bB"
bin <- many1 binaryDigit
return $ Token $ Binary ('0' : b : bin)
<?> "Binary Integer"
-- parse a binary digit
binaryDigit :: Parser Char
binaryDigit = satisfy (\c -> c == '0' || c == '1') <?> "binary digit"