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|
-- Jack Compiler, as the coursework of Project 11 of Nand2Tetris course.
-- Author: Yuchen Pei (me@ypei.me)
-- Date: 2018-01-12
{-# 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
import Control.Monad
import Data.Map (Map)
import qualified Data.Map as Map
data JClass = JClass JIdentifier [JClassVarDec] [JSubroutineDec] deriving (Show, Eq)
data JClassVarDec = JClassVarDec JClassVarScope JTypeAndId deriving (Show, Eq)
data JSubroutineDec = JSubroutineDec JSubroutineHeader JSubroutineBody deriving (Show, Eq)
data JSubroutineHeader = JSubroutineHeader JSubroutineType JTypeAndId [JTypeAndId] deriving (Show, Eq)
data JSubroutineBody = JSubroutineBody [JTypeAndId] [JStatement] deriving (Show, Eq)
data JStatement = JLetStatment JVarId JExpression
| JIfStatement JExpression [JStatement] (Maybe [JStatement])
| JWhileStatment JExpression [JStatement]
| JDoStatement JSubroutineCall
| JReturnStatement (Maybe JExpression)
deriving (Show, Eq)
data JExpression = JIntConst Int
| JStrConst [Char]
| JKeywordConst [Char] -- can only be true, false, null or this
| JExpVar JVarId
| JExpCall JSubroutineCall
| JExpUna JUOp JExpression -- JOp can only be - or ~ here
| JExpBin JExpression [(JBOp, JExpression)]
deriving (Show, Eq)
data JVarId = JVarId JIdentifier (Maybe JExpression) deriving (Show, Eq)
data JSubroutineCall = JSubroutineCall JIdentifier (Maybe JIdentifier) [JExpression] deriving (Show, Eq)
data ClassTable = C [Char] Table Int deriving (Show, Eq)
type JBOp = Char
type JUOp = Char
type JIdentifier = [Char]
type JTypeAndId = (JType, JIdentifier)
type JClassVarScope = [Char]
type JType = [Char]
type JSubroutineType = [Char]
type JackParser = Parsec [Char] ()
type Table = Map [Char] ([Char], [Char], Int)
binaryOpChars = "+-*/&|<>="
unaryOpChars = "-~"
keywordConstStrs = ["true", "false", "null", "this"]
primTypeStrs = ["int", "char", "boolean"]
primTypeStrs' = primTypeStrs ++ ["void"]
classVarScopeStrs = ["static", "field"]
subroutineTypeStrs = ["constructor", "function", "method"]
alphaUnderscore = ['a' .. 'z'] ++ ['A' .. 'Z'] ++ ['_']
alphaNumUnderscore = alphaUnderscore ++ ['0'..'9']
parse' parser = parse parser ""
--jack xs = parse' (many jSpace >> jClass) (replCrWithNl xs)
jack = parse' (many jSpace >> jClass)
jClass :: JackParser JClass
jClass = do
string "class" >> many1 jSpace
id <- jIdentifier
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]
jClassType = do
x <- oneOf ['A' .. 'Z']
xs <- many $ oneOf alphaNumUnderscore
return $ x:xs
jBOp :: JackParser JBOp
jBOp = oneOf binaryOpChars
jUOp :: JackParser JUOp
jUOp = oneOf unaryOpChars
jComment :: JackParser ()
jComment = jInlineComment <|> jBlockComment
jInlineComment :: JackParser ()
jInlineComment = return () <*
try (string "//" >> manyTill (noneOf "\n\r") endOfLine)
--try (string "//" >> manyTill (noneOf "\n") newline)
jSpace :: JackParser ()
jSpace = (return () <* space) <|> jComment
jBlockComment :: JackParser ()
jBlockComment = return () <*
try (string "/*" >> manyTill anyChar (try $ string "*/"))
jPrimType :: JackParser JType
jPrimType = choice $ string <$> primTypeStrs
jType :: JackParser JType
jType = choice [jPrimType, jClassType]
jPrimType' :: JackParser JType
jPrimType' = choice $ string <$> primTypeStrs'
jType' :: JackParser JType
jType' = choice [jPrimType', jClassType]
jClassVarScope :: JackParser JClassVarScope
jClassVarScope = choice $ string <$> classVarScopeStrs
jSubroutineType :: JackParser JSubroutineType
jSubroutineType = choice $ string <$> subroutineTypeStrs
jIdentifier :: JackParser [Char]
jIdentifier = do
x <- oneOf alphaUnderscore
xs <- many $ oneOf alphaNumUnderscore
return $ x:xs
jClassVarDecs :: JackParser [JClassVarDec]
jClassVarDecs = do
scope <- jClassVarScope
many1 jSpace
typeAndIds <- jTypeAndIds
many jSpace >> char ';'
return $ JClassVarDec scope <$> typeAndIds
jVarDecs :: JackParser [JTypeAndId]
jVarDecs =
(string "var" >> many1 jSpace) >> jTypeAndIds <* (many jSpace >> char ';')
jTypeAndId :: JackParser JType -> JackParser JTypeAndId
jTypeAndId p = do
type_ <- p
many1 jSpace
id <- jIdentifier
return (type_, id)
jTypeAndIds :: JackParser [JTypeAndId]
jTypeAndIds = do
type_ <- jType
many1 jSpace
ids <- sepBy jIdentifier (try $ many jSpace >> char ',' >> many jSpace)
return $ (\x -> (type_, x)) <$> ids
jParameters :: JackParser [JTypeAndId]
jParameters = do
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 jSpace
typeAndId <- jTypeAndId jType'
params <- jParameters
return $ JSubroutineHeader subtype typeAndId params
jExpression :: JackParser JExpression
jExpression = jExpBin <|> jTerm
jTerm :: JackParser JExpression
jTerm = choice [jIntConst, jStrConst, jKeywordConst, jExpCall, jExpVar, jExpUna, jExpInBraces]
jIntConst :: JackParser JExpression
jIntConst = JIntConst <$> (read <$> many1 digit)
jStrConst :: JackParser JExpression
jStrConst = JStrConst <$> between (char '"') (char '"') (many $ noneOf "\"")
jKeywordConst :: JackParser JExpression
jKeywordConst = JKeywordConst <$> (choice $ try <$> string <$> keywordConstStrs)
jExpVar :: JackParser JExpression
jExpVar = JExpVar <$> jVarId
jVarId :: JackParser JVarId
jVarId = do
id <- jIdentifier
maybeArray <- optionMaybe $ try (char '[' >> jExpression <* char ']')
return $ JVarId id maybeArray
jExpCall :: JackParser JExpression
jExpCall = JExpCall <$> jSubroutineCall
jExpUna :: JackParser JExpression
jExpUna = do
op <- oneOf unaryOpChars
many jSpace
x <- jTerm
return $ JExpUna op x
jExpInBraces :: JackParser JExpression
jExpInBraces = between (char '(') (char ')') jExpression -- expressions like a + () is not allowed
jExpBin :: JackParser JExpression
jExpBin = try $ do
x <- jTerm
xs <- many1 jOpAndTerm
return $ JExpBin x xs
jOpAndTerm :: JackParser (JBOp, JExpression)
jOpAndTerm = do
op <- many jSpace >> jBOp
x <- many jSpace >> jTerm
return (op, x)
jSubroutineDec :: JackParser JSubroutineDec
jSubroutineDec = do
header <- jSubroutineHeader
many jSpace
body <- jSubroutineBody
return $ JSubroutineDec header body
jSubroutineBody :: JackParser JSubroutineBody
jSubroutineBody = do
char '{'
varDecs <- many $ try (many jSpace >> jVarDecs)
stmts <- many $ try (many jSpace >> jStatement)
many jSpace >> char '}'
return $ JSubroutineBody (mconcat varDecs) stmts
jStatement :: JackParser JStatement
jStatement = choice [jLetStatement, jIfStatement, jWhileStatement, jDoStatement, jReturnStatement]
jLetStatement :: JackParser JStatement
jLetStatement = do
string "let" >> many1 jSpace
leftVarId <- jVarId
many jSpace >> char '=' >> many jSpace
exp <- jExpression
many jSpace >> char ';'
return $ JLetStatment leftVarId exp
jIfStatement = do
string "if" >> many jSpace >> char '(' >> many jSpace
exp <- jExpression
many jSpace >> char ')' >> many jSpace >> char '{' >> many jSpace
stmts <- many (try $ many jSpace >> jStatement)
many jSpace >> char '}'
stmts' <- optionMaybe $ try jElseBlock
return $ JIfStatement exp stmts stmts'
jElseBlock :: JackParser [JStatement]
jElseBlock = do
many jSpace >> string "else" >> many jSpace >> char '{' >> many jSpace
stmts <- many (try $ many jSpace >> jStatement)
many jSpace >> char '}'
return stmts
jWhileStatement :: JackParser JStatement
jWhileStatement = do
string "while" >> many jSpace >> char '(' >> many jSpace
exp <- jExpression
many jSpace >> char ')' >> many jSpace >> char '{'
stmts <- many (try $ many jSpace >> jStatement)
many jSpace >> char '}'
return $ JWhileStatment exp stmts
jDoStatement :: JackParser JStatement
jDoStatement = do
jCall <- string "do" >> many jSpace >> jSubroutineCall
many jSpace >> char ';'
return $ JDoStatement jCall
jReturnStatement :: JackParser JStatement
jReturnStatement = do
string "return" >> many jSpace
res <- optionMaybe $ try jExpression
many jSpace >> char ';'
return $ JReturnStatement res
jSubroutineCall :: JackParser JSubroutineCall
jSubroutineCall = try $ do
callee <- jIdentifier
method <- optionMaybe $ try (char '.' >> jIdentifier)
args <- emptyArgs <|> someArgs
return $ JSubroutineCall callee method args
emptyArgs :: JackParser [JExpression]
emptyArgs = return [] <* (try $ char '(' >> many jSpace >> char ')')
someArgs :: JackParser [JExpression]
someArgs = do
char '(' >> many jSpace
exps <- sepBy jExpression (many jSpace >> char ',' >> many jSpace)
many jSpace >> char ')'
return exps
-- vm writer starts from here
buildCTable :: [Char] -> [JClassVarDec] -> ClassTable
buildCTable name xs = go 0 0 Map.empty xs
where go n _ t [] = C name t n
go nField nStatic t ((JClassVarDec "field" (ty, jId)):ys) =
go (nField + 1) nStatic (Map.insert jId (ty, "this", nField) t) ys
go nField nStatic t ((JClassVarDec "static" (ty, jId)):ys) =
go nField (nStatic + 1) (Map.insert jId (ty, "static", nStatic) t) ys
--data JClass = JClass JIdentifier [JClassVarDec] [JSubroutineDec] deriving (Show, Eq)
buildSRTable :: [JClass] -> Table
buildSRTable xs = Map.fromList $ mconcat $ go <$> xs where
go (JClass cName _ subs) = go' <$> subs where
go' (JSubroutineDec (JSubroutineHeader kind (ty, sName) args) _) =
(cName ++ "." ++ sName, (ty, kind, length args))
buildLTable :: [JTypeAndId] -> [JTypeAndId] -> Table
buildLTable args lcls =
(go "argument" args 0 Map.empty) `Map.union` (go "local" lcls 0 Map.empty) where
go _ [] _ t = t
go kind ((ty, name):xs) n t = go kind xs (n + 1) $ Map.insert name (ty, kind, n) t
--data JSubroutineDec = JSubroutineDec JSubroutineHeader JSubroutineBody deriving (Show, Eq)
--data JSubroutineHeader = JSubroutineHeader JSubroutineType JTypeAndId [JTypeAndId] deriving (Show, Eq)
--data JSubroutineBody = JSubroutineBody [JTypeAndId] [JStatement] deriving (Show, Eq)
vSubroutine :: ClassTable -> JSubroutineDec -> [Char]
vSubroutine cTable sub =
vFunction (cName ++ "." ++ sName) nLcls ++
(if sType == "constructor" vNew n else "") ++
mconcat $ vStmts where
C cName t n = cTable
JSubroutineDec (JSubroutineHeader _ (_, sName) args) (JSubroutineBody lcls stmts) = sub
nLcls = length lcls
s = buildLTable args lcls
vStmts = vStatement t s sName 0 stmts
-- data JStatement = JLetStatment JVarId JExpression
-- | JIfStatement JExpression [JStatement] (Maybe [JStatement])
-- | JWhileStatment JExpression [JStatement]
-- | JDoStatement JSubroutineCall
-- | JReturnStatement (Maybe JExpression)
vStatement _ _ _ _ [] = ""
vStatement t s name n ((JLetStatment var exp):stmts) =
-- vExpression: push the result of exp; vPopToVar: pop to the var addr
vExpression t s name exp ++ vPopToVar t s var ++ vStatement t s name n stmts
vStatement t s name n ((JIfStatement cond thenStmts elseStmts):stmts) =
vExpression t s name cond ++ vNot ++ vThen thenStmts ++
maybe (vLabel labelElse) vElse elseStmts ++ vStatement t s name (n + 1) stmts where
labelElse = name ++ ".Else" ++ show n
labelEndIf = name ++ ".Endif" ++ show n
vThen xs = vIfGoto labelElse ++ vStatement t s labelElse 0 xs
vElse xs = vGoto labelEndIf ++ vLabel labelElse ++
vStatement t s labelIf 0 xs ++ vLabel labelEndIf
vStatement t s name n ((JWhileStatment cond loopStmts):stmts) =
vLabel labelWhile ++ vExpression t s name cond ++ vNot ++ vIfGoto labelEndWhile ++
vStatement t s labelWhile 0 loopStmts ++ vGoto labelWhile ++
vLabel labelEndWhile ++ vStatement t s name (n + 1) stmts where
labelWhile = name ++ ".While" ++ show n
labelEndWhile = name ++ ".EndWhile" ++ show n
vStatement t s name n ((JDoStatement subCall):stmts) =
vSubroutineCall t s name subCall ++ vPop "temp" 0 ++ vStatement t s name n stmts
vStatement t s name n ((JReturnStatement ret):stmts) =
maybe (vPush "constant" 0) (vExpression t s name) ret ++ vReturn ++
vStatement t s name n stmts
-- data JExpression = JIntConst Int
-- | JStrConst [Char]
-- | JKeywordConst [Char] -- can only be true, false, null or this
-- | JExpVar JVarId
-- | JExpCall JSubroutineCall
-- | JExpUna JUOp JExpression -- JOp can only be - or ~ here
-- | JExpBin JExpression [(JBOp, JExpression)]
vExpression t s _ (JIntConst n) = push "constant" n
vExpression t s _ (JStrConst xs) =
vPush "constant" (length xs) ++ vCall "String.new" 1 ++ mconcat (go <$> xs) where
go x = vPush "constant" (ord x) ++ vCall "String.appendChar" 2
vExpression t s cName (JExpVar (JVarId name idx))
| idx == Nothing = vPush seg n
| idx == Maybe exp = vPush seg n ++ vExpression t s cName exp ++ vAdd
++ vPop "pointer" 1 ++ vPush "that" 0
where (seg, n) = getSegN t s name
vPopToVar t s cName (JVarId name idx))
| idx == Nothing = vPop seg n
| idx == Maybe Exp = vPush seg n ++ vExpression t s cName exp ++ vAdd ++
vPop "pointer" 1 ++ vPop "that" 0
where (seg, n) = getSegN t s name
vExpression t s cName (JExpCall subCall) = vSubroutineCall t s cName subCall
vExpression t s cName (JExpUna op exp) = vExpression t s cName exp ++ vOp op
where vOp '~' = vNot; vOp '-' = vNeg;
vExpression t s cName (JExpBin exp xs) =
vExpression t s cName exp ++ mconcat (go <$> xs)
where go (op, exp) = vExpression t s cName exp ++ vOp op
vOp '+' = vAdd; vOp '-' = vSub; vOp '*' = vMul; vOp '/' = vDiv;
vOp '&' = vAnd; vOp '|' = vOr; vOp '<' = vLt; vOp '>' = vGt;
vOp '=' = vEq;
getSegN :: Table -> Table -> [Char] -> ([Char], Int)
getSegN t s name = case Map.lookup name s of
Just (_, seg, n) -> (seg, n)
Nothing -> let (_, seg, n) = t Map.! name in (seg, n)
-- data JSubroutineCall = JSubroutineCall JIdentifier (Maybe JIdentifier) [JExpression] deriving (Show, Eq)
vSubroutineCall t s cName (JSubroutineCall name name' args) =
mconcat (vExpression t s cName <$> args) ++ vCall name'' nArgs
vNew n = vPush "constant" n ++ vCall "Memory.alloc" 1 ++ vPop "pointer" 0
vAdd = "add\n"
vNot = "not\n"
vNeg = "neg\n"
vSub = "sub\n"
vMul = "call Math.multiply 2\n"
vDiv = "call Math.division 2\n"
vAnd = "and\n"
vOr = "or\n"
vLt = "lt\n"
vGt = "gt\n"
vEq = "eq\n"
vReturn = "return\n"
vLabel xs = "label " ++ xs ++ "\n"
vGoto xs = "goto " ++ xs ++ "\n"
vIfGoto xs = "if-goto " ++ xs ++ "\n"
vFunction xs n = "function " ++ xs ++ " " ++ show n ++ "\n"
vCall xs n = "call " ++ xs ++ " " ++ show n ++ "\n"
vPush xs n = "push " ++ xs ++ " " ++ show n ++ "\n"
vPop xs n = "pop " ++ xs ++ " " ++ show n ++ "\n"
--vClass :: JClass -> [Char]
--vClass (JClass cName cVars subs) =
--vSubroutine (table cName cVars) <$> subs
fst3 (x, y, z) = x
snd3 (x, y, z) = y
trd3 (x, y, z) = z
{--
replCrWithNl :: [Char] -> [Char]
replCrWithNl = fmap cr2nl
where cr2nl '\r' = '\n'
cr2nl c = c
--}
-- IO
{--
main = do
dir <- head <$> getArgs
filesWODir <- filter isJackFile <$> listDirectory dir
let jackFiles = (dir++) <$> filesWODir
codes <- sequence $ readFile <$> jackFiles
zipWithM writeFile (chExt <$> jackFiles) (show . jack <$> codes)
where isJackFile xs = drop (length xs - 5) xs == ".jack"
chExt xs = take (length xs - 4) xs ++ "ast"
--}
|