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()
