class Parser(object):
A_CMD = 'A_COMMAND'
C_CMD = 'C_COMMAND'
L_CMD = 'L_COMMAND'
def __init__(self, file_name):
self.lines = []
self.current_position = 0
self.symbol_table = SymbolTable()
self.readInFile(file_name)
self.addLabelsToSymbolTable()
self.substituteVars()
def readInFile(self, file_name):
with open (file_name, "r") as fp:
for line in fp.readlines():
line = line.strip()
# skip empty newlines and comments
if not line or line.startswith("//"):
continue
self.lines.append(line.split()[0])
def addLabelsToSymbolTable(self):
line_count = 1
while (self.hasMoreCommands()):
self.advance()
if self.commandType() == Parser.L_CMD:
# TODO check this, this is wonky
self.symbol_table.addEntry(self.symbol(), line_count-1)
else:
line_count += 1
# reset current_position after reading
self.current_position = 0
def substituteVars(self):
while (self.hasMoreCommands()):
self.advance()
if self.commandType() != Parser.A_CMD:
continue
var = self.symbol()
if var.isdigit():
continue
if not self.symbol_table.contains(var):
self.symbol_table.addEntry(var)
self.lines[self.current_position-1] = "@{}".format(self.symbol_table.getAddress(var))
# reset current_position after reading
self.current_position = 0
def commandType(self):
if not self.current_command:
raise Exception("current_command is empty")
if self.current_command.startswith("@"):
return self.A_CMD
if self.current_command.startswith("("):
return self.L_CMD
return self.C_CMD
def hasMoreCommands(self):
return self.current_position < len(self.lines)
def advance(self):
self.current_command = self.lines[self.current_position]
self.current_position += 1
def symbol(self):
return self.current_command.strip("@()")
def dest(self):
if len(self.current_command.split("=")) == 2:
return self.current_command.split("=")[0]
def comp(self):
if len(self.current_command.split(";")) == 2:
return self.current_command.split(";")[0]
elif len(self.current_command.split("=")) == 2:
return self.current_command.split("=")[1]
def jump(self):
if len(self.current_command.split(";")) == 2:
return self.current_command.split(";")[1]
register_symble(parser, symbol_table)
parser.reset_idx()
while parser.hasMoreCommands():
parser.advance()
cmdtype = parser.commandType()
if cmdtype == "A_COMMAND":
symbol = parser.symbol()
if re.search("[A-Za-z]", symbol) != None:
if symbol_table.contains(symbol):
address = symbol_table.getAddress(symbol) #16進数
else:
address = format(ram_address, '04x') #16進数
symbol_table.addEntry(symbol, address)
ram_address += 1
symbol = int(address, 16)
binary = bin(int(symbol))[2:]
bit16 = ("0" * (16 - len(binary))) + binary
elif cmdtype == "C_COMMAND":
dest_bin = code.dest2bin(parser.dest())
comp_bin = code.comp2bin(parser.comp())
jump_bin = code.jump2bin(parser.jump())
bit16 = "111" + comp_bin + dest_bin + jump_bin
else:
continue # L_COMMAND((Xxx))はバイナリコードへ変換した際に削除される形式なので飛ばす
def assemble(self):
#
# first pass - build the symbol table for labels
#
parser = Parser(self.source_filename)
symbol_table = SymbolTable()
# the current instruction
instruction = 0
# parse each command
while parser.hasMoreCommands():
# advance to the next command
parser.advance()
# parse the command type and look for symbols
command_type = parser.commandType()
if command_type == "L":
# look for an instruction label symbol
symbol = parser.symbol()
if symbol not in symbol_table:
symbol_table.addEntry(symbol, instruction)
else:
# increment the instruction count if this was not a label
if command_type != "L":
instruction += 1
#
# second pass - build the symbol table for variables
#
parser = Parser(self.source_filename)
# the memory location for the next variable
variable_address = 16
# parse each command
while parser.hasMoreCommands():
# advance to the next command
parser.advance()
# parse the command type and look for symbols
command_type = parser.commandType()
if command_type == "A":
# look for a variable value symbol
symbol = parser.symbol()
if symbol[0] not in map(str, range(0, 10)):
# the symbol is not a number; that is, it is actually a symbol
if symbol not in symbol_table:
symbol_table.addEntry(symbol, variable_address)
variable_address += 1
#
# third pass - generate assembly
#
parser = Parser(self.source_filename)
code = Code()
# parse all commands
while parser.hasMoreCommands():
# advance to the next command
parser.advance()
command_type = parser.commandType()
if command_type == "A":
# a command
symbol = parser.symbol()
if symbol in symbol_table:
symbol = symbol_table.getAddress(symbol)
symbol_binary = code.decimalToBinary(symbol)
self.destination_file.write("0" + symbol_binary + "\n")
elif command_type == "C":
# c command
comp = code.comp(parser.comp())
dest = code.dest(parser.dest())
jump = code.jump(parser.jump())
self.destination_file.write("111" + comp + dest + jump + "\n")
elif command_type == "L":
# label - do nothing in this stage
pass
else:
# unknown command
raise Exception("ERROR: Unknown command type encountered")
# close the output file
self.destination_file.close()
#a_command_set = set()
a_command_list = []
while asm.hasMoreCommands():
asm.advance()
current_command = asm.currentCommand
current_command_type = asm.commandType()
if current_command_type == 'L_COMMAND':
#get the symbol and
symbol = asm.symbol()
#add the symbol into the table only if it does not already exist
if not symbol_table.contains(symbol):
#add the symbol
symbol_table.addEntry(symbol, l_command_address)
continue
if current_command_type == 'A_COMMAND':
#get the symbol
symbol = asm.symbol()
#check to see if it really is a symbol or just a number
if not symbol.isdigit():
if symbol not in a_command_list:
a_command_list.append(symbol)
l_command_address += 1
continue
class AssmParser(AssmCommandType, Parser):
def __init__(self, file_name):
""" Open the input file/stream and gets ready to parse it """
super(AssmParser, self).__init__(file_name)
self.RAM = 16
self.symbol_table = SymbolTable(self.buff)
self.symbol_table.find_symbols()
def symbol(self):
"""
returns the symbol or decimal Xxx of the current command @Xxx of (Xxx).
Should be called only when commandType() is A_COMMAND or L_COMMAND
return string
"""
self.current_symbol = self.current_command[1:]
def dest(self):
"""
returns the dest mnemonic in the current C_COMMAND (8 possibilities).
Should be called only when AssmCommandType() is C_COMMAND
returns string
"""
# semicolon: 000 dest
if '=' in self.current_command:
d = self.current_command.split('=')[0]
else:
d='null'
code = Code()
self.current_dest = code.dest(d)
def comp(self):
"""
Returns the comp menomonic in the current C_COMMAND (28 possibilities)
Should be called only when commandType() is C_COMMAND
return string
"""
if '=' in self.current_command:
c = self.current_command.split('=')[1]
elif ';' in self.current_command:
c = self.current_command.split(';')[0]
code = Code()
self.current_comp, self.current_a = code.comp(c)
#def a(self):
##TODO: figure out how to know 'a' bit
## I believe it has to do whether the previous command is an l or a command
#self.current_a = '0'
def jump(self):
"""
Returns the jump mnemonic in the current C_COMMAND (8 possibilities)
Should be called only when commandType() is C_COMMAND
returns string
"""
# equal: 000 jump
if ';' in self.current_command:
j = self.current_command.split(';')[1]
elif '=' in self.current_command:
j='null'
else:
j = None
code = Code()
self.current_jump = code.jump(j)
def __repr__(self):
return self.asmfile + '\n'.join(self.buff)
def binarize_c_command(self):
self.comp()
self.dest()
self.jump()
self.bin_current = '111' + self.current_a + self.current_comp + self.current_dest + self.current_jump
def binarize_a_symbol(self):
if not self.symbol_table.contains(self.current_command):
self.symbol_table.addEntry(self.current_command, self.RAM)
self.RAM = self.RAM + 1
address = self.symbol_table.get_address(self.current_command)
bin_address = bin(address)[2:]
self.bin_current = '0' * (16 - len(bin_address)) + bin_address
def binarize_a_address(self):
address = int(self.current_command[1:])
bin_address = bin(address)[2:]
self.bin_current = '0'*(16 - len(bin_address)) + bin_address
def binarize_a_command(self):
if re.match(r'^@[0-9].*$', self.current_command):
self.binarize_a_address()
else:
self.binarize_a_symbol()
class Parser:
def __init__(self, assembly_path: str) -> None:
self.coder = Code()
self.symbol_table = SymbolTable()
self.assembly = []
self.idx = 0
f = open(assembly_path, 'r')
while True:
line = f.readline()
if not line: break
if line[:2] == "//": continue
if [e for e in line if e != " "] == ["\n"]:
continue
self.assembly.append(line)
f.close()
def reset_idx(self):
self.idx = 0
def hasMoreCommands(self) -> bool:
return self.idx < len(self.assembly)
def advance(self) -> None:
if self.hasMoreCommands():
self.idx += 1
def commandType(self) -> str:
if self.hasMoreCommands():
curr = self.assembly[self.idx]
if "@" in curr:
print("A", curr)
return A
elif "=" in curr or ";" in curr:
print("C", curr)
return C
elif "(" in curr:
return L
else:
return None
def symbol(self) -> str:
symbol = "".join([s for s in self.assembly[self.idx] if s != " "])
symbol = symbol.split("\n")[0]
if self.commandType() == A:
symbol = symbol[1:]
if not self.symbol_table.contains(symbol):
try:
address = int(symbol)
self.symbol_table.addEntry(symbol, str(address))
except:
self.symbol_table.addEntry(symbol,
str(self.symbol_table.idx))
self.symbol_table.advance()
self.assembly[
self.idx] = "@" + self.symbol_table.getAddress(symbol)
elif self.commandType() == L:
symbol = symbol[1:-1]
if not self.symbol_table.contains(symbol):
self.symbol_table.addEntry(symbol, str(self.idx))
self.assembly = self.assembly[:self.idx] + self.assembly[self.idx +
1:]
else:
return ""
return self.symbol_table.getAddress(symbol)
def dest(self) -> str:
if self.commandType() == C:
return self.coder.dest(self.assembly[self.idx])
else:
raise NotImplementedError
def comp(self) -> str:
if self.commandType() == C:
return self.coder.comp(self.assembly[self.idx])
else:
raise NotImplementedError
def jump(self) -> str:
if self.commandType() == C:
return self.coder.jump(self.assembly[self.idx])
else:
raise NotImplementedError
# def address(self) -> str:
# if self.commandType() == A:
# return self.coder.address(self.assembly[self.idx])
# else:
# raise NotImplementedError
def address(self) -> str:
instruction = self.assembly[self.idx]
instruction = "".join([i for i in instruction if i != " "])
instruction = instruction[1:].split("\n")[0]
if self.symbol_table.contains(instruction):
address = self.symbol_table.getAddress(instruction)
else:
address = instruction
b = bin(int(address))[2:]
address = "0" * (16 - len(b)) + b
return address
class AssemblerSymb:
def __init__(self, path):
self.parser = Parser(path)
self.code = Code()
self.symb_table = SymbolTable()
ind1 = path.find('/')
ind2 = path.find('.')
writefile = path[:ind1] + "/" + path[ind1+1:ind2]
self.file = open(writefile + '2.hack', 'w')
def binary(self, s):
return "{0:b}".format(int(s))
def firstPass(self):
counter = 0
while self.parser.hasMoreCommands():
self.parser.advance()
command_type = self.parser.commandType()
if command_type in ['A_COMMAND', 'C_COMMAND']:
counter += 1
elif command_type == 'L_COMMAND':
symbol = self.parser.symbol()
self.symb_table.addEntry(symbol, counter)
else:
raise ValueError("Unexpected command type encountered")
def secondPass(self):
ram_address = 16
self.parser.i = -1
while self.parser.hasMoreCommands():
self.parser.advance()
command_type = self.parser.commandType()
if command_type == 'A_COMMAND':
symbol = self.parser.symbol()
if (not symbol.isdigit()) and (not self.symb_table.contains(symbol)):
self.symb_table.addEntry(symbol, ram_address)
ram_address += 1
def createOutput(self):
self.parser.i = -1
while self.parser.hasMoreCommands():
self.parser.advance()
command_type = self.parser.commandType()
# if A command
if command_type == 'A_COMMAND':
symbol = self.parser.symbol()
if symbol.isdigit():
bin_symbol = self.binary(symbol)
else:
symb_add = self.symb_table.getAddress(symbol)
bin_symbol = self.binary(symb_add)
a_command = '0' * (16 - len(bin_symbol)) + bin_symbol
self.file.write(a_command + '\n')
elif command_type == 'C_COMMAND':
dest_mnem = self.parser.dest()
dest = self.code.dest(dest_mnem)
comp_mnem = self.parser.comp()
comp = self.code.comp(comp_mnem)
jump_mnem = self.parser.jump()
jump = self.code.jump(jump_mnem)
c_command = '111' + comp + dest + jump
self.file.write(c_command + '\n')
else:
pass
self.file.close()
