mirror of
https://github.com/catseye/SixtyPical.git
synced 2024-07-10 00:28:59 +00:00
66 lines
1.6 KiB
Python
66 lines
1.6 KiB
Python
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class Word(object):
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def __init__(self, value):
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self.value = value
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def size(self):
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return 2
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def serialize(self):
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word = self.value
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low = word & 255
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high = (word >> 8) & 255
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return chr(low) + chr(high)
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class Label(object):
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def __init__(self, name, addr=None):
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self.name = name
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self.addr = addr
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def set_addr(self, addr):
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self.addr = addr
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def size(self):
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return 2
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def serialize(self):
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if self.addr is None:
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raise ValueError(self.addr)
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return Word(self.addr).serialize()
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class Emitter(object):
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def __init__(self, addr):
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self.accum = []
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self.addr = addr
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self.name_counter = 0
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def gen(self, *things):
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for thing in things:
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if isinstance(thing, int):
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if thing < -127 or thing > 255:
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raise ValueError(thing)
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if thing < 0:
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thing += 256
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self.accum.append(thing)
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self.addr += 1
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else:
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self.accum.append(thing)
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self.addr += thing.size()
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def serialize(self, stream):
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for thing in self.accum:
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if isintance(thing, int):
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stream.write(chr(thing))
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else:
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stream.write(thing.serialize())
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def make_label(self, name=None):
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if name is None:
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name = 'label' + self.name_counter
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self.name_counter += 1
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return Label(name, addr=self.addr)
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def resolve_label(self, label):
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label.set_addr(self.addr)
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