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")