def main():
"""Drives the VM-to-Hack translation procces"""
file_name = sys.argv[1]
parsers = []
abs_path = os.path.abspath(file_name)
if ".vm" in file_name and file_name[-3:] == ".vm":
parser = Parser(abs_path)
parsers.append(parser)
output_path = os.path.splitext(abs_path)[0] + ".asm"
else:
path_split = abs_path.rsplit("/")
output_path = abs_path + "/" + path_split[-1] + ".asm"
for walk_obj in os.walk(abs_path):
for vm_file in walk_obj[2]:
if ".vm" in vm_file and vm_file[-3:] == ".vm":
parser = Parser(abs_path + "/" + vm_file)
parsers.append(parser)
cw = CodeWriter(output_path)
cw.write_init()
for parser in parsers:
a_path = parser.get_file_name()
fname = os.path.split(a_path)[1][:-3]
cw.set_file_name(fname)
while parser.has_more_commands():
parser.advance()
command_type = parser.command_type()
if command_type == "C_ARITHMETIC":
cw.write_arithmetic(parser.get_command())
elif command_type == "C_PUSH" or command_type == "C_POP":
command = command_type
segment = parser.arg1()
index = parser.arg2()
cw.write_push_pop(command, segment, index)
elif command_type == "C_LABEL":
label = parser.arg1()
cw.write_label(label)
elif command_type == "C_GOTO":
label = parser.arg1()
cw.write_goto(label)
elif command_type == "C_IF":
label = parser.arg1()
cw.write_if(label)
elif command_type == "C_CALL":
function_name = parser.arg1()
num_args = parser.arg2()
cw.write_call(function_name, num_args)
elif command_type == "C_RETURN":
cw.write_return()
elif command_type == "C_FUNCTION":
function_name = parser.arg1()
num_locals = parser.arg2()
cw.write_function(function_name, num_locals)
def main():
"""Drives the entire translation process."""
"""Preprocess the file"""
pp = Preprocessor()
pp.remove_white_spaces_comments()
pp.write_temp_file()
"""First pass - adds labels to the symbol table."""
parser = Parser(sys.argv[1] + '.tmp')
symbol_table = SymbolTable()
pc = -1
while parser.has_more_commands():
parser.advance()
command_type = parser.command_type()
if command_type == 'A_COMMAND' or command_type == 'C_COMMAND':
pc += 1
elif command_type == 'L_COMMAND':
label = parser.symbol()
symbol_table.addEntry(label, pc + 1)
"""Second pass - handles variables names and writes the *.hack file."""
ram_address = 16
parser = Parser(sys.argv[1] + '.tmp')
code = Code()
file_name = parser.get_file_name()
hack_file = open(file_name + '.hack', 'w')
while parser.has_more_commands():
parser.advance()
command_type = parser.command_type()
if command_type == 'A_COMMAND':
a_symbol = parser.symbol()
if a_symbol[0] in '0123456789':
a_symbol_binary = code.convert_to_binary(a_symbol)
hack_file.write('0' + a_symbol_binary + '\n')
else:
if symbol_table.contains(a_symbol) is False:
symbol_table.addEntry(a_symbol, ram_address)
ram_address += 1
address = symbol_table.GetAddress(a_symbol)
address_binary = code.convert_to_binary(address)
hack_file.write('0' + address_binary + '\n')
elif command_type == 'C_COMMAND':
comp = code.comp(parser.comp())
dest = code.dest(parser.dest())
jump = code.jump(parser.jump())
hack_file.write('111' + comp + dest + jump + '\n')
hack_file.close()