author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
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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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Nishanth Amuluru <nishanth@fossee.in>
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""" |
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def repr(self, x): |
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return self._callhelper(reprlib.Repr.repr, self, x) |
c6bca38c1cbf
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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): |
c6bca38c1cbf
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""" return a size-limited safe repr-string for the given object. |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
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Failing __repr__ functions of user instances will be represented |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
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with a short exception info and 'saferepr' generally takes |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
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care to never raise exceptions itself. This function is a wrapper |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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around the Repr/reprlib functionality of the standard 2.6 lib. |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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""" |
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# review exception handling |
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srepr = SafeRepr() |
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srepr.maxstring = maxsize |
c6bca38c1cbf
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srepr.maxsize = maxsize |
c6bca38c1cbf
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srepr.maxother = 160 |
c6bca38c1cbf
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Nishanth Amuluru <nishanth@fossee.in>
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return srepr.repr(obj) |