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preprocessor.py
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preprocessor.py
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import sys
PROGRAMS_DIR = './programs/'
def read_program(filename):
with open(filename, "r") as file:
return file.readlines()
def save_program(program, filename):
with open(filename, "w") as file:
file.writelines(program)
def get_program(name):
return read_program(PROGRAMS_DIR + name.lower() + '.r')
def program_replace_register(program, to_be_replaced, replacement):
for i in range(len(program)):
if program[i][0]== 'j':
continue
# dont accidentaly replace smaller register name
program[i] = program[i].replace(' {} '.format(to_be_replaced), ' {} '.format(replacement))
program[i] = program[i].replace(' {}\n'.format(to_be_replaced), ' {}\n'.format(replacement))
def expand_call(line):
items = line.strip().split(' ')
program = get_program(items[0][1:])
program = to_low_level(program)
c = 0
for register in items[1:]:
program_replace_register(program, c, '~{}~'.format(register))
c+= 1
c = 0
for register in items[1:]:
program_replace_register(program, '~{}~'.format(register), register)
c+= 1
return program
def expand_calls(program):
expanded = []
for line in program:
if("$" in line):
expanded += expand_call(line)
else:
expanded.append(line)
return expanded
def handle_labels(program):
ic = 0
labels = dict()
without_labels = []
for line in program:
if line[0] == '#':
labels[line[1:].strip()] = ic
else:
ic+=1
without_labels.append(line)
for id in range(len(without_labels)):
line = without_labels[id]
if '>' in line:
char_index = line.index('>')
label = line[line.index('>') + 1:]
abs_pos = labels[label.strip()]
rel_jmp = abs_pos-id
line = line[0: char_index] + str(rel_jmp) + '\n'
without_labels[id] = line
return without_labels
def to_low_level(program):
expanded = expand_calls(program)
return handle_labels(expanded)
def preprocess_file(input_file, output_file):
program = read_program(input_file)
program = to_low_level(program)
save_program(program, output_file)
def main():
if len(sys.argv) != 3:
print("run this program as {} input_file output_file".format(sys.argv[0]))
exit(1)
preprocess_file(sys.argv[1], sys.argv[2])
if __name__ == "__main__":
main()