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79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# Copyright (c) 2016 by Rocky Bernstein
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# Copyright (c) 2000-2002 by hartmut Goebel <h.goebel@crazy-compilers.com>
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# Copyright (c) 1999 John Aycock
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import sys
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from uncompyle6 import PYTHON3
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if PYTHON3:
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intern = sys.intern
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class Token:
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"""
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Class representing a byte-code instruction.
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A byte-code token is equivalent to Python 3's dis.instruction or
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the contents of one line as output by dis.dis().
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"""
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# FIXME: match Python 3.4's terms:
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# type_ should be opname
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# linestart = starts_line
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# attr = argval
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# pattr = argrepr
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def __init__(self, type_, attr=None, pattr=None, offset=-1,
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linestart=None, op=None, has_arg=None, opc=None):
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self.type = intern(type_)
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self.op = op
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self.has_arg = has_arg
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self.attr = attr
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self.pattr = pattr
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self.offset = offset
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self.linestart = linestart
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self.opc = opc
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def __eq__(self, o):
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""" '==', but it's okay if offsets and linestarts are different"""
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if isinstance(o, Token):
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# Both are tokens: compare type and attr
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# It's okay if offsets are different
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return (self.type == o.type) and (self.pattr == o.pattr)
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else:
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return self.type == o
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def __repr__(self):
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return str(self.type)
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def __str__(self):
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pattr = self.pattr if self.pattr is not None else ''
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prefix = '\n%3d ' % self.linestart if self.linestart else (' ' * 6)
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return (prefix +
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('%9s %-18s %r' % (self.offset, self.type, pattr)))
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def format(self):
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prefix = '\n%4d ' % self.linestart if self.linestart else (' ' * 6)
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offset_opname = '%6s %-17s' % (self.offset, self.type)
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argstr = "%6d " % self.attr if isinstance(self.attr, int) else (' '*7)
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if self.pattr:
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pattr = self.pattr
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if self.opc:
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if self.op in self.opc.hasjrel:
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pattr = "to " + self.pattr
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elif self.op in self.opc.hasjabs:
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self.pattr= str(self.pattr)
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if not self.pattr.startswith('to '):
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pattr = "to " + str(self.pattr)
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pass
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# And so on. See xdis/bytecode.py
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pass
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else:
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pattr = ''
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return "%s%s%s %r" % (prefix, offset_opname, argstr, pattr)
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def __hash__(self):
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return hash(self.type)
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def __getitem__(self, i):
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raise IndexError
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NoneToken = Token('LOAD_CONST', offset=-1, attr=None, pattr=None)
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