forked from mirrors/gecko-dev
93 lines
2.9 KiB
Python
93 lines
2.9 KiB
Python
from __future__ import with_statement
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import sys
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__all__ = ['nested', 'catch_warnings', 'examine_warnings']
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try:
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from contextlib import nested
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except ImportError:
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from contextlib import contextmanager
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@contextmanager
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def nested(*managers):
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exits = []
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vars = []
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exc = (None, None, None)
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try:
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for mgr in managers:
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exit = mgr.__exit__
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enter = mgr.__enter__
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vars.append(enter())
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exits.append(exit)
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yield vars
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except:
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exc = sys.exc_info()
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finally:
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while exits:
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exit = exits.pop()
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try:
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if exit(*exc):
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exc = (None, None, None)
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except:
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exc = sys.exc_info()
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if exc != (None, None, None):
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raise exc[1]
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# copied from Python 2.6
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try:
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from warnings import catch_warnings
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except ImportError:
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class catch_warnings(object):
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def __init__(self, record=False, module=None):
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self._record = record
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self._module = sys.modules['warnings']
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self._entered = False
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def __repr__(self):
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args = []
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if self._record:
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args.append("record=True")
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name = type(self).__name__
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return "%s(%s)" % (name, ", ".join(args))
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def __enter__(self):
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if self._entered:
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raise RuntimeError("Cannot enter %r twice" % self)
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self._entered = True
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self._filters = self._module.filters
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self._module.filters = self._filters[:]
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self._showwarning = self._module.showwarning
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if self._record:
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log = []
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def showwarning(*args, **kwargs):
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log.append(WarningMessage(*args, **kwargs))
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self._module.showwarning = showwarning
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return log
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else:
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return None
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def __exit__(self, *exc_info):
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if not self._entered:
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raise RuntimeError("Cannot exit %r without entering first" % self)
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self._module.filters = self._filters
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self._module.showwarning = self._showwarning
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class WarningMessage(object):
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_WARNING_DETAILS = ("message", "category", "filename", "lineno", "file",
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"line")
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def __init__(self, message, category, filename, lineno, file=None,
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line=None):
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local_values = locals()
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for attr in self._WARNING_DETAILS:
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setattr(self, attr, local_values[attr])
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self._category_name = None
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if category.__name__:
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self._category_name = category.__name__
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def examine_warnings(func):
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def wrapper():
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with catch_warnings(record=True) as ws:
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func(ws)
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return wrapper
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