diff options
Diffstat (limited to 'projects/10')
| -rw-r--r-- | projects/10/JackParser.hs | 131 |
1 files changed, 78 insertions, 53 deletions
diff --git a/projects/10/JackParser.hs b/projects/10/JackParser.hs index a2418c0..0138cac 100644 --- a/projects/10/JackParser.hs +++ b/projects/10/JackParser.hs @@ -1,11 +1,16 @@ -- Jack Parser, as the coursework of Project 10 of Nand2Tetris course. --- Author: Yuchen Pei +-- Author: Yuchen Pei (me@ypei.me) +-- Date: January 2018 {-# LANGUAGE FlexibleContexts #-} import Text.Parsec.Prim import Text.Parsec.Char import Text.Parsec.Combinator import Data.Functor.Identity import Data.Either +import Data.Maybe +import Data.List +import System.Environment +import System.Directory data JClass = JClass JIdentifier [JClassVarDec] [JSubroutineDec] deriving (Show, Eq) data JClassVarDec = JClassVarDec JClassVarScope JTypeAndId deriving (Show, Eq) @@ -18,7 +23,6 @@ data JStatement = JLetStatment JVarId JExpression | JDoStatement JSubroutineCall | JReturnStatement (Maybe JExpression) deriving (Show, Eq) ---data JExpression = JExpression JTerm [(JBOp, JTerm)] deriving (Show, Eq) -- JBOp can only be one of +-*/&|<>= data JExpression = JIntConst Int | JStrConst [Char] | JKeywordConst [Char] -- can only be true, false, null or this @@ -26,9 +30,6 @@ data JExpression = JIntConst Int | JExpCall JSubroutineCall | JExpUna JUOp JExpression -- JOp can only be - or ~ here | JExpBin JExpression [(JBOp, JExpression)] - -- | JTermVarId JLeftVarId - -- | JTermCall JSubroutineCall - -- | JTermExp JExpression deriving (Show, Eq) data JVarId = JVarId JIdentifier (Maybe JExpression) deriving (Show, Eq) data JSubroutineCall = JSubroutineCall JIdentifier (Maybe JIdentifier) [JExpression] deriving (Show, Eq) @@ -36,8 +37,6 @@ type JBOp = Char type JUOp = Char type JIdentifier = [Char] type JTypeAndId = (JType, JIdentifier) ---type JParameter = JTypeAndId ---type JVarDec = JTypeAndId type JClassVarScope = [Char] type JType = [Char] type JSubroutineType = [Char] @@ -54,24 +53,18 @@ subroutineTypeStrs = ["constructor", "function", "method"] alphaUnderscore = ['a' .. 'z'] ++ ['A' .. 'Z'] ++ ['_'] alphaNumUnderscore = alphaUnderscore ++ ['0'..'9'] ---str2JType xs = case xs of "int" -> JInt; "char" -> JChar; "boolean" -> JBoolean; "void" -> JVoid; ---str2JClassVarScope xs = case xs of "static" -> JStatic; "field" -> JField; ---str2JSubroutineType xs = case xs of "constructor" -> JConstructor; "function" -> JFunction; "method" -> JMethod; - parse' parser = parse parser "" jack = parse' jClass jClass :: JackParser JClass jClass = do - string "class" >> many1 space + string "class" >> many1 jSpace id <- jIdentifier - many space >> char '{' - --classVarDecs <- sepBy jClassVarDecs (many space) - classVarDecs <- many $ try (many space >> jClassVarDecs) - --subroutineDecs <- sepBy jSubroutineDec (many space) - subroutineDecs <- many $ try (many space >> jSubroutineDec) - many space >> char '}' + many jSpace >> char '{' + classVarDecs <- many $ try (many jSpace >> jClassVarDecs) + subroutineDecs <- many $ try (many jSpace >> jSubroutineDec) + many jSpace >> char '}' return $ JClass id (mconcat classVarDecs) subroutineDecs jClassType :: JackParser [Char] @@ -86,6 +79,20 @@ jBOp = oneOf binaryOpChars jUOp :: JackParser JUOp jUOp = oneOf unaryOpChars +jComment :: JackParser () +jComment = jInlineComment <|> jBlockComment + +jInlineComment :: JackParser () +jInlineComment = return () <* + try (string "//" >> manyTill (noneOf "\n") newline) + +jSpace :: JackParser () +jSpace = (return () <* jSpace) <|> jComment + +jBlockComment :: JackParser () +jBlockComment = return () <* + try (string "/*" >> manyTill anyChar (try $ string "*/")) + jPrimType :: JackParser JType jPrimType = choice $ string <$> primTypeStrs @@ -113,40 +120,40 @@ jIdentifier = do jClassVarDecs :: JackParser [JClassVarDec] jClassVarDecs = do scope <- jClassVarScope - many1 space + many1 jSpace typeAndIds <- jTypeAndIds - many space >> char ';' + many jSpace >> char ';' return $ JClassVarDec scope <$> typeAndIds jVarDecs :: JackParser [JTypeAndId] jVarDecs = - (string "var" >> many1 space) >> jTypeAndIds <* (many space >> char ';') + (string "var" >> many1 jSpace) >> jTypeAndIds <* (many jSpace >> char ';') jTypeAndId :: JackParser JType -> JackParser JTypeAndId jTypeAndId p = do type_ <- p - many1 space + many1 jSpace id <- jIdentifier return (type_, id) jTypeAndIds :: JackParser [JTypeAndId] jTypeAndIds = do type_ <- jType - many1 space - ids <- sepBy jIdentifier (many space >> char ',' >> many space) + many1 jSpace + ids <- sepBy jIdentifier (many jSpace >> char ',' >> many jSpace) return $ (\x -> (type_, x)) <$> ids jParameters :: JackParser [JTypeAndId] jParameters = do - char '(' >> many space - params <- sepBy (jTypeAndId jType) (try $ many space >> char ',' >> many space) - many space >> char ')' + char '(' >> many jSpace + params <- sepBy (jTypeAndId jType) (try $ many jSpace >> char ',' >> many jSpace) + many jSpace >> char ')' return params jSubroutineHeader :: JackParser JSubroutineHeader jSubroutineHeader = do subtype <- jSubroutineType - many1 space + many1 jSpace typeAndId <- jTypeAndId jType' params <- jParameters return $ JSubroutineHeader subtype typeAndId params @@ -181,7 +188,7 @@ jExpCall = JExpCall <$> jSubroutineCall jExpUna :: JackParser JExpression jExpUna = do op <- oneOf unaryOpChars - many space + many jSpace x <- jTerm return $ JExpUna op x @@ -196,23 +203,23 @@ jExpBin = try $ do jOpAndTerm :: JackParser (JBOp, JExpression) jOpAndTerm = do - op <- many space >> jBOp - x <- many space >> jTerm + op <- many jSpace >> jBOp + x <- many jSpace >> jTerm return (op, x) jSubroutineDec :: JackParser JSubroutineDec jSubroutineDec = do header <- jSubroutineHeader - many space + many jSpace body <- jSubroutineBody return $ JSubroutineDec header body jSubroutineBody :: JackParser JSubroutineBody jSubroutineBody = do char '{' - varDecs <- many $ try (many space >> jVarDecs) - stmts <- many $ try (many space >> jStatement) - many space >> char '}' + varDecs <- many $ try (many jSpace >> jVarDecs) + stmts <- many $ try (many jSpace >> jStatement) + many jSpace >> char '}' return $ JSubroutineBody (mconcat varDecs) stmts jStatement :: JackParser JStatement @@ -220,48 +227,48 @@ jStatement = choice [jLetStatement, jIfStatement, jWhileStatement, jDoStatement, jLetStatement :: JackParser JStatement jLetStatement = do - string "let" >> many1 space + string "let" >> many1 jSpace leftVarId <- jVarId - many space >> char '=' >> many space + many jSpace >> char '=' >> many jSpace exp <- jExpression - many space >> char ';' + many jSpace >> char ';' return $ JLetStatment leftVarId exp jIfStatement = do - string "if" >> many space >> char '(' >> many space + string "if" >> many jSpace >> char '(' >> many jSpace exp <- jExpression - many space >> char ')' >> many space >> char '{' >> many space + many jSpace >> char ')' >> many jSpace >> char '{' >> many jSpace stmts <- many jStatement - many space >> char '}' + many jSpace >> char '}' stmts' <- optionMaybe $ try jElseBlock return $ JIfStatement exp stmts stmts' jElseBlock :: JackParser [JStatement] jElseBlock = do - many space >> string "else" >> many space >> char '{' >> many space + many jSpace >> string "else" >> many jSpace >> char '{' >> many jSpace stmts <- many jStatement - many space >> char '}' + many jSpace >> char '}' return stmts jWhileStatement :: JackParser JStatement jWhileStatement = do - string "while" >> many space >> char '(' >> many space + string "while" >> many jSpace >> char '(' >> many jSpace exp <- jExpression - many space >> char ')' >> many space >> char '{' >> many space + many jSpace >> char ')' >> many jSpace >> char '{' >> many jSpace stmts <- many jStatement return $ JWhileStatment exp stmts jDoStatement :: JackParser JStatement jDoStatement = do - jCall <- string "do" >> many space >> jSubroutineCall - many space >> char ';' + jCall <- string "do" >> many jSpace >> jSubroutineCall + many jSpace >> char ';' return $ JDoStatement jCall jReturnStatement :: JackParser JStatement jReturnStatement = do - string "return" >> many space + string "return" >> many jSpace res <- optionMaybe $ try jExpression - many space >> char ';' + many jSpace >> char ';' return $ JReturnStatement res jSubroutineCall :: JackParser JSubroutineCall @@ -272,11 +279,29 @@ jSubroutineCall = try $ do return $ JSubroutineCall callee method args emptyArgs :: JackParser [JExpression] -emptyArgs = return [] <* (try $ char '(' >> many space >> char ')') +emptyArgs = return [] <* (try $ char '(' >> many jSpace >> char ')') someArgs :: JackParser [JExpression] someArgs = do - char '(' >> many space - exps <- sepBy jExpression (many space >> char ',' >> many space) - many space >> char ')' + char '(' >> many jSpace + exps <- sepBy jExpression (many jSpace >> char ',' >> many jSpace) + many jSpace >> char ')' return exps + +-- IO +parseCodes :: [[Char]] -> [[Char]] -> [Char] +parseCodes codes = jack <$> codes + +lastSplit c xs = (take (prefix - 1) xs, drop prefix xs) + where prefix = length xs - (fromJust . elemIndex c . reverse) xs + +main = do + dir <- head <$> getArgs + filesWODir <- filter isJackFile <$> listDirectory dir + let jackFiles = (dir++) <$> filesWODir + let ofPath = dir ++ (snd $ lastSplit '/' $ init dir) ++ ".ast" + let filenames = removeExt <$> filesWODir + codes <- sequence $ readFile <$> jackFiles + writeFile ofPath $ parseCodes codes filenames + where isJackFile xs = drop (length xs - 4) xs == ".jack" + removeExt xs = take (length xs - 4) xs |