123 lines
3.2 KiB
Python
Executable file
123 lines
3.2 KiB
Python
Executable file
#!/usr/bin/python3
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import collections
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import ctypes
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import re
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import sys
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class Mixin:
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def __add__(self, other):
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return self.value + other
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def __sub__(self, other):
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return self.value - other
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def __radd__(self, other):
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return self.value + other
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def __rsub__(self, other):
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return self.value - other
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def __iadd__(self, other):
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self.value += other
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return self
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def __isub__(self, other):
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self.value -= other
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return self
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def __eq__(self, other):
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return self.value == other
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def __hash__(self):
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return hash(self.value)
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class Byte(Mixin, ctypes.c_byte):
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pass
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class UByte(Mixin, ctypes.c_ubyte):
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pass
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Int = lambda x: x
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TYPE = Byte
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class Machine:
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def __init__(self, program):
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self.program = program
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cells = {}
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self.cells = collections.defaultdict(lambda: TYPE(0), cells)
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self.data_pointer = TYPE(0)
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self.instruction_pointer = 0
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self.command_map = {
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'>': self.increment_data_pointer,
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'<': self.decrement_data_pointer,
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'+': self.increment_cell,
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'-': self.decrement_cell,
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'.': self.print_cell,
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',': self.set_cell,
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'[': self.loop_start,
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']': self.loop_end
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}
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def increment_data_pointer(self):
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self.data_pointer += 1
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def decrement_data_pointer(self):
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self.data_pointer -= 1
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def increment_cell(self):
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self.cells[self.data_pointer] += 1
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def decrement_cell(self):
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self.cells[self.data_pointer] -= 1
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def print_cell(self):
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print(chr(self.cells[self.data_pointer]), end='')
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def set_cell(self):
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self.cells[self.data_pointer] = TYPE(ord(input('=> ')))
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def loop_start(self):
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if self.cells[self.data_pointer] == 0:
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loop_starts = 0
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self.instruction_pointer += 1
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instruction = self.program[self.instruction_pointer]
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while loop_starts > 0 or instruction != ']':
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if instruction == '[':
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loop_starts += 1
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if instruction == ']':
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loop_starts -= 1
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self.instruction_pointer += 1
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instruction = self.program[self.instruction_pointer]
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def loop_end(self):
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if self.cells[self.data_pointer] != 0:
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loop_ends = 0
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self.instruction_pointer -= 1
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instruction = self.program[self.instruction_pointer]
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while loop_ends > 0 or instruction != '[':
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if instruction == ']':
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loop_ends += 1
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if instruction == '[':
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loop_ends -= 1
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self.instruction_pointer -= 1
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instruction = self.program[self.instruction_pointer]
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def run(self):
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while self.instruction_pointer < len(self.program):
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self.command_map[self.program[self.instruction_pointer]]()
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self.instruction_pointer += 1
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if __name__ == "__main__":
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with open(sys.argv[1], 'r') as f:
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program = re.findall(f"[{re.escape('<>+-.,[]')}]", f.read())
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machine = Machine(program)
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machine.run()
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print("\nExiting...")
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