From d3a0cc3a8ba6dfeb64d3faeffdeb6845b60e5840 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Sat, 20 Jan 2018 15:41:49 +0100
Subject: rearranged the dir for github

- removed tools and pdfs
- rearranged the projects dirs
- added md files
- other minor changes
---
 projects/07/VMTranslator.hs | 88 ---------------------------------------------
 1 file changed, 88 deletions(-)
 delete mode 100644 projects/07/VMTranslator.hs

(limited to 'projects/07/VMTranslator.hs')

diff --git a/projects/07/VMTranslator.hs b/projects/07/VMTranslator.hs
deleted file mode 100644
index ce8447d..0000000
--- a/projects/07/VMTranslator.hs
+++ /dev/null
@@ -1,88 +0,0 @@
-import Data.Char (toUpper)
-import Data.List.Split (splitOn)
-import System.Environment (getArgs)
-import Data.Maybe (fromJust)
-import Data.List (elemIndex)
-
-preamble = "@256\nD=A\n@SP\nM=D\n"
-
-epilogue = "(END)\n@END\n0;JMP"
-
-parse' :: [Char] -> [[Char]] -> Int -> [Char] -> [Char]
-parse' op [] n _
-  | op `elem` ["add", "sub", "and", "or"] = pop "M" ++ pop ('M':(f op):"D") ++ push "D"
-  | op `elem` ["eq", "gt", "lt"] = pop "M" ++ pop "M-D" ++ ifThenElse op n
-  | otherwise = pop "M" ++ push (f op:"D")
-    where f "add" = '+'; f "sub" = '-'; f "and" = '&'; 
-          f "or" = '|'; f "neg" = '-'; f "not" = '!'
-
-parse' "push" ["constant", x] _ _ = "@" ++ x ++ "\nD=A\n" ++ push "D"
-
-parse' cmd [seg, x] _ _ | seg `elem` ["local", "argument", "this", "that"] =
-  case cmd of 
-    "push" -> getAddr seg x ++ "A=D\nD=M\n" ++ push "D"
-    "pop" -> getAddr seg x ++ "@R13\nM=D\n" ++ pop "M" ++ "@R13\nA=M\nM=D\n"
-
-parse' cmd [seg, x] _ _ | seg `elem` ["pointer", "temp"] = 
-  case cmd of 
-    "push" -> getAddr' seg x ++ "D=M\n" ++ push "D"
-    "pop" -> pop "M" ++ getAddr' seg x ++ "M=D\n"
-
-parse' cmd ["static", x] _ filename =
-  case cmd of
-    "push" -> getAddr'' x filename ++ "D=M\n" ++ push "D"
-    "pop" -> pop "M" ++ getAddr'' x filename ++ "M=D\n"
-
-getAddr seg x = "@" ++ seg2Lab seg ++ "\nD=M\n@" ++ x ++ "\nD=A+D\n"
-
-getAddr' seg x = "@" ++ show (read x + (if seg == "pointer" then 3 else 5)) ++ "\n"
-
-getAddr'' x filename = "@" ++ filename ++ "." ++ x ++ "\n"
-
-seg2Lab seg = case seg of
-  "local" -> "LCL"
-  "argument" -> "ARG"
-  "this" -> "THIS" 
-  "that" -> "THAT"
-
-push :: [Char] -> [Char]
-push xs = "@SP\nA=M\nM=" ++ xs ++ "\n@SP\nM=M+1\n"
-
-ifThenElse :: [Char] -> Int -> [Char]
-ifThenElse cond n = "@" ++ cond' ++ show n ++ "\nD;J" ++ cond' ++ "\n" ++ push "0"
-                  ++ "@ENDIF" ++ cond' ++ show n ++ "\n0;JMP\n(" ++ cond' ++ show n ++ ")\n" 
-                  ++ push "-1" ++ "(ENDIF" ++ cond' ++ show n ++ ")\n"
-  where cond' = toUpper <$> cond
-
-pop :: [Char] -> [Char]
-pop xs = "@SP\nAM=M-1\nD=" ++ xs ++ "\n"
-
-parseline :: [[Char]] -> Int -> [Char] -> [Char] -> [Char]
-parseline [] _ acc _ = acc
-parseline (line:lines) n acc filename = parseline lines (n + 1) (acc ++ parse' cmd target n filename) filename
-  where cmd:target = words line
-
-stripJunk :: [Char] -> [[Char]]
-stripJunk = filter (not . isEmptyLine) . fmap (head . splitOn "//") . lines . replCrWithNl
-
-isEmptyLine :: [Char] -> Bool
-isEmptyLine = null . filter (not . flip elem " \t") 
-
-parseCode :: [Char] -> [Char] -> [Char]
-parseCode xs filename = preamble ++ (parseline (stripJunk xs) 0 "" filename) ++ epilogue
-
-replCrWithNl :: [Char] -> [Char]
-replCrWithNl = fmap cr2nl 
-  where cr2nl '\r' = '\n'
-        cr2nl c = c
-
-lastSplit c xs = (take (prefix - 1) xs, drop prefix xs)
-  where prefix = length xs - (fromJust . elemIndex c . reverse) xs
-
-main = do
-  args <- getArgs
-  let path = head args
-  let pathWithoutExt = fst $ lastSplit '.' path
-  let filename = snd $ lastSplit '/' pathWithoutExt
-  code <- readFile path
-  writeFile (pathWithoutExt ++ ".asm") (parseCode code filename)
-- 
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