class VMTranslator():
'''
Manages the translation effort, bridging the gap between the Parser and Codewriter objects.
A new Parser is created for each file in the directory.
'''
def __init__(self, filename):
if os.path.isdir(filename):
self._files = [
filename + '/' + x for x in os.listdir(filename)
if x.endswith(".vm")
]
self._isdir = True
self._name = filename + '/' + filename.split('/')[-1] + '.asm'
elif os.path.isfile(filename) and filename.endswith('.vm'):
self._files = [filename]
self._isdir = False
self._name = filename.replace('.vm', '.asm')
else:
self._files = list()
self._isdir = False
return
self._output = []
self._code = CodeWriter(self._name)
if self._isdir:
self._code.write_init()
for file in self._files:
self._parser = Parser(file)
self._code.filename(file.replace('.vm', '').split('/')[-1])
self.translate()
self._code.close()
def translate(self):
# using input from parser, translate and output
while self._parser.has_more_commands():
self._parser.advance()
if self._parser.command_type() in ['C_ARITHMETIC', 'C_BOOLEAN']:
self._code.write_arithmetic(self._parser.command())
elif self._parser.command_type() in ['C_POP', 'C_PUSH']:
self._code.write_pushpop(self._parser.command_type(),
self._parser.arg1(),
self._parser.arg2())
elif self._parser.command_type() == 'C_LABEL':
self._code.write_label(self._parser.arg1())
elif self._parser.command_type() == 'C_GOTO':
self._code.write_goto(self._parser.arg1())
elif self._parser.command_type() == 'C_IF':
self._code.write_if(self._parser.arg1())
elif self._parser.command_type() == 'C_FUNCTION':
self._code.write_function(self._parser.arg1(),
self._parser.arg2())
elif self._parser.command_type() == 'C_CALL':
self._code.write_call(self._parser.arg1(), self._parser.arg2())
elif self._parser.command_type() == 'C_RETURN':
self._code.write_return()
def main():
arg_len = len(sys.argv)
file_list = []
output_file = ""
parsers = []
if arg_len == 1:
dir_name = os.getcwd()
output_file = dir_name + '/' + dir_name.split('/')[-1] + ".asm"
for f in os.listdir(dir_name):
if f.endswith(".vm"):
file_list.append(f)
if not file_list:
print("Error, no .vm files in current directory")
return
elif arg_len == 2:
if os.path.isdir(sys.argv[1]):
output_file = sys.argv[1] + sys.argv[1].split('/')[-2] + ".asm"
for f in os.listdir(sys.argv[1]):
if f.endswith(".vm"):
file_list.append(f)
if not file_list:
print("Error, no .vm files in given directory")
return
file_list = [sys.argv[1] + "/" + f for f in file_list]
else:
if os.path.splitext(sys.argv[1])[1] != ".vm":
print("Error, .vm file not specified")
return
else:
file_list.append(sys.argv[1])
output_file = os.path.splitext(sys.argv[1])[0] + ".asm"
try:
writer = CodeWriter(output_file)
except IOError as e:
print("In codewriter: ")
print(e)
return
else:
try:
parsers = [Parser(f) for f in file_list]
except IOError as e:
print("In parsers: ")
print(e)
return
else:
writer.write_init()
for p in parsers:
writer.set_file_name(p.static_name)
while p.hasMoreCommands():
p.advance()
cmd = p.command_type()
if cmd != "C_RETURN":
argument1 = p.arg1()
if cmd in ["C_POP", "C_PUSH", "C_FUNCTION",
"C_CALL"]:
argument2 = p.arg2()
if cmd == "C_ARITHMETIC":
writer.write_arithmetic(argument1)
elif cmd in ["C_POP", "C_PUSH"]:
writer.write_push_pop(cmd, argument1,
argument2)
elif cmd == "C_LABEL":
writer.write_label(argument1)
elif cmd == "C_GOTO":
writer.write_goto(argument1)
elif cmd == "C_IF":
writer.write_if(argument1)
elif cmd == "C_FUNCTION":
writer.write_function(argument1, int(argument2))
elif cmd == "C_CALL":
writer.write_call(argument1, argument2)
elif cmd == "C_RETURN":
writer.write_return()
writer.close()