55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
import py
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import sys, os.path
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builtin_repr = repr
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reprlib = py.builtin._tryimport('repr', 'reprlib')
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class SafeRepr(reprlib.Repr):
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""" subclass of repr.Repr that limits the resulting size of repr()
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and includes information on exceptions raised during the call.
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"""
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def repr(self, x):
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return self._callhelper(reprlib.Repr.repr, self, x)
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def repr_instance(self, x, level):
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return self._callhelper(builtin_repr, x)
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def _callhelper(self, call, x, *args):
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try:
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# Try the vanilla repr and make sure that the result is a string
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s = call(x, *args)
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except py.builtin._sysex:
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raise
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except:
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cls, e, tb = sys.exc_info()
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exc_name = getattr(cls, '__name__', 'unknown')
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try:
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exc_info = str(e)
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except sysex:
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raise
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except:
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exc_info = 'unknown'
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return '<[%s("%s") raised in repr()] %s object at 0x%x>' % (
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exc_name, exc_info, x.__class__.__name__, id(x))
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else:
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if len(s) > self.maxsize:
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i = max(0, (self.maxsize-3)//2)
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j = max(0, self.maxsize-3-i)
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s = s[:i] + '...' + s[len(s)-j:]
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return s
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def saferepr(obj, maxsize=240):
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""" return a size-limited safe repr-string for the given object.
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Failing __repr__ functions of user instances will be represented
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with a short exception info and 'saferepr' generally takes
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care to never raise exceptions itself. This function is a wrapper
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around the Repr/reprlib functionality of the standard 2.6 lib.
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"""
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# review exception handling
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srepr = SafeRepr()
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srepr.maxstring = maxsize
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srepr.maxsize = maxsize
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srepr.maxother = 160
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return srepr.repr(obj)
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