sources for assertion.py [rev. unknown]

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import __builtin__, sys

import py

from py.__.magic import exprinfo

BuiltinAssertionError = __builtin__.AssertionError

class AssertionError(BuiltinAssertionError):

    def __init__(self, *args):

        BuiltinAssertionError.__init__(self, *args)

        if args:

            self.msg = str(args[0])

        else:

            f = sys._getframe(1)

            try:

                source = py.code.Frame(f).statement

                source = str(source.deindent()).strip()

            except py.error.ENOENT:

                source = None

                # this can also occur during reinterpretation, when the

                # co_filename is set to "<run>".

            if source:

                self.msg = exprinfo.interpret(source, f, should_fail=True)

                if not self.args:

                    self.args = (self.msg,)

            else:

                self.msg = None

def invoke():

    py.magic.patch(__builtin__, 'AssertionError', AssertionError)

def revoke():

    py.magic.revert(__builtin__, 'AssertionError')