def main(input_file):
if len(input_file.split('.')) == 1:
if input_file[-1] == '/':
input_file = input_file[:-1]
output_file = join(input_file, input_file.split('/')[-1])
input_files = [
join(input_file, f) for f in listdir(input_file)
if f.split('.')[1] == 'vm' and f != 'Sys.vm'
and isfile(join(input_file, f))
]
input_files.insert(0, join(input_file, 'Sys.vm'))
print('Input files: {}'.format(input_files))
else:
input_files = [input_file]
directory = '/'.join(input_file.split('/')[:-1])
output_file = join(directory, input_file.split('/')[-1].split('.')[0])
code_writer = CodeWriter(output_file)
code_writer.write_init()
for input_file in input_files:
parser = Parser(input_file)
code_writer.set_filename(input_file)
n = 0
while parser.advance():
com_type = parser.command_type()
print('LINE {}'.format(n))
print('\tcom type: {}'.format(com_type))
print('\tcommand: {}'.format(parser.command))
if com_type != parser.c_return:
arg1 = parser.arg1()
if com_type in [
parser.c_push, parser.c_pop, parser.c_function,
parser.c_call
]:
arg2 = parser.arg2()
if com_type == parser.c_arithmetic:
code_writer.write_arithmetic(arg1)
elif com_type in [parser.c_pop, parser.c_push]:
code_writer.write_push_pop(com_type, arg1, int(arg2))
elif com_type == parser.c_label:
code_writer.write_label(arg1)
elif com_type == parser.c_goto:
code_writer.write_goto(arg1)
elif com_type == parser.c_if:
code_writer.write_if(arg1)
elif com_type == parser.c_function:
code_writer.write_function(arg1, arg2)
elif com_type == parser.c_return:
code_writer.write_return()
elif com_type == parser.c_call:
code_writer.write_call(arg1, arg2)
n += 1
code_writer.close()
def translate(self):
code_writer = CodeWriter(self.destination_file)
# for each source filename
for source_filename in self.source_filenames:
parser = Parser(source_filename)
code_writer.set_filename(source_filename)
# parse each command
while parser.has_more_commands():
# advance to the next command
parser.advance()
# parse the command type
command_type = parser.command_type()
if command_type == "C_ARITHMETIC":
code_writer.write_arithemtic(parser.arg1())
elif command_type in ["C_POP", "C_PUSH"]:
code_writer.write_push_pop(command_type, parser.arg1(), parser.arg2())
elif command_type == "C_LABEL":
code_writer.write_label(parser.arg1())
elif command_type == "C_GOTO":
code_writer.write_goto(parser.arg1())
elif command_type == "C_IF":
code_writer.write_if(parser.arg1())
elif command_type == "C_FUNCTION":
code_writer.write_function(parser.arg1(), parser.arg2())
elif command_type == "C_RETURN":
code_writer.write_return()
elif command_type == "C_CALL":
code_writer.write_call(parser.arg1(), parser.arg2())
else:
raise Exception("Not implemented: command type " + command_type)
# close the output file
code_writer.close()
if filename.find('.vm') != -1:
c.set_filename(filename)
p = Parser(BASE + filename)
while p.has_more_lines():
p.advance()
command = p.command_type()
arg_1 = p.arg_1()
arg_2 = p.arg_2()
if command in ['C_PUSH', 'C_POP']:
c.write_push_pop(command, arg_1, arg_2)
if command == 'C_ARITHMETIC':
c.write_arithmetic(arg_1)
if command == 'C_GOTO':
c.write_goto(arg_1)
if command == 'C_IF':
c.write_if(arg_1)
if command == 'C_LABEL':
c.write_label(arg_1)
if command == 'C_FUNCTION':
c.write_function(arg_1, arg_2)
if command == 'C_RETURN':
c.write_return()
if command == 'C_CALL':
c.write_call(arg_1, arg_2)
class VMTranslator:
def __init__(self, src: str):
self.asm_file, self.vm_files = self._parse_files(src)
print("Translate to %s." % self.asm_file)
self.code_writer = CodeWriter(self.asm_file)
def translates(self):
for vm_file in self.vm_files:
self._translate(vm_file)
def _parse_files(self, file_path: str) -> (str, list):
if not os.path.exists(file_path):
raise IOError("No such file or directory.")
if os.path.isfile(file_path) and file_path.endswith(VM_EXT):
asm_file = file_path.replace(VM_EXT, ASM_EXT)
vm_files = [file_path]
elif os.path.isdir(file_path):
dir_path = file_path[:-1] if file_path[-1] == "/" else file_path
asm_file = dir_path + "/" + os.path.basename(dir_path) + ASM_EXT
vm_files = self._find_all_files_with_ext(dir_path, "vm")
else:
raise IOError("No such file or directory.")
return asm_file, vm_files
def _find_all_files_with_ext(self, dir_path: str, ext: str) -> list:
ext_files = []
suffix = os.extsep + ext.lower()
for cur_dir, _, files in os.walk(dir_path):
for file in files:
if file.lower().endswith(suffix):
ext_files.append(os.path.join(cur_dir, file))
return ext_files
def _translate(self, vm_file: str):
parser = Parser(vm_file)
self.code_writer.set_filename(vm_file)
self.code_writer.write("// ---------- %s ----------" %
self.code_writer.current_vm_file)
while parser.next_line():
self.code_writer.write("// " + parser.command_line())
if parser.command_type() == "C_ARITHMETIC":
self.code_writer.write_arithmetic(parser.argn(0))
elif parser.command_type() == "C_PUSH":
self.code_writer.write_push(parser.argn(1), parser.argn(2))
elif parser.command_type() == "C_POP":
self.code_writer.write_pop(parser.argn(1), parser.argn(2))
elif parser.command_type() == "C_LABEL":
self.code_writer.write_label(parser.argn(1))
elif parser.command_type() == "C_GOTO":
self.code_writer.write_goto(parser.argn(1))
elif parser.command_type() == "C_IF_GOTO":
self.code_writer.write_if_goto(parser.argn(1))
elif parser.command_type() == "C_FUNCTION":
self.code_writer.write_function(parser.argn(1),
int(parser.argn(2)))
elif parser.command_type() == "C_CALL":
self.code_writer.write_call(parser.argn(1),
int(parser.argn(2)))
elif parser.command_type() == "C_RETURN":
self.code_writer.write_return()
self.code_writer.write("") # empty line
self.code_writer.write("// ------------------------------\n")