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8387a3538f
resetwarnings(): change the docstring to reflect what the code actually does. Note that the description in the Library Reference manual is already accurate. Bugfix candidate.
256 lines
8.0 KiB
Python
256 lines
8.0 KiB
Python
"""Python part of the warnings subsystem."""
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import sys, re, types
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__all__ = ["warn", "showwarning", "formatwarning", "filterwarnings",
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"resetwarnings"]
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defaultaction = "default"
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filters = []
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onceregistry = {}
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def warn(message, category=None, stacklevel=1):
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"""Issue a warning, or maybe ignore it or raise an exception."""
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# Check category argument
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if category is None:
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category = UserWarning
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assert issubclass(category, Warning)
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# Get context information
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try:
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caller = sys._getframe(stacklevel)
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except ValueError:
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globals = sys.__dict__
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lineno = 1
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else:
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globals = caller.f_globals
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lineno = caller.f_lineno
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if globals.has_key('__name__'):
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module = globals['__name__']
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else:
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module = "<string>"
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filename = globals.get('__file__')
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if filename:
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fnl = filename.lower()
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if fnl.endswith(".pyc") or fnl.endswith(".pyo"):
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filename = filename[:-1]
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else:
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if module == "__main__":
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filename = sys.argv[0]
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if not filename:
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filename = module
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registry = globals.setdefault("__warningregistry__", {})
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warn_explicit(message, category, filename, lineno, module, registry)
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def warn_explicit(message, category, filename, lineno,
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module=None, registry=None):
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if module is None:
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module = filename
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if module[-3:].lower() == ".py":
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module = module[:-3] # XXX What about leading pathname?
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if registry is None:
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registry = {}
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key = (message, category, lineno)
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# Quick test for common case
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if registry.get(key):
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return
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# Search the filters
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for item in filters:
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action, msg, cat, mod, ln = item
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if (msg.match(message) and
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issubclass(category, cat) and
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mod.match(module) and
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(ln == 0 or lineno == ln)):
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break
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else:
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action = defaultaction
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# Early exit actions
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if action == "ignore":
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registry[key] = 1
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return
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if action == "error":
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raise category(message)
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# Other actions
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if action == "once":
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registry[key] = 1
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oncekey = (message, category)
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if onceregistry.get(oncekey):
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return
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onceregistry[oncekey] = 1
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elif action == "always":
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pass
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elif action == "module":
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registry[key] = 1
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altkey = (message, category, 0)
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if registry.get(altkey):
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return
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registry[altkey] = 1
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elif action == "default":
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registry[key] = 1
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else:
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# Unrecognized actions are errors
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raise RuntimeError(
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"Unrecognized action (%s) in warnings.filters:\n %s" %
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(`action`, str(item)))
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# Print message and context
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showwarning(message, category, filename, lineno)
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def showwarning(message, category, filename, lineno, file=None):
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"""Hook to write a warning to a file; replace if you like."""
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if file is None:
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file = sys.stderr
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file.write(formatwarning(message, category, filename, lineno))
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def formatwarning(message, category, filename, lineno):
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"""Function to format a warning the standard way."""
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import linecache
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s = "%s:%s: %s: %s\n" % (filename, lineno, category.__name__, message)
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line = linecache.getline(filename, lineno).strip()
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if line:
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s = s + " " + line + "\n"
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return s
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def filterwarnings(action, message="", category=Warning, module="", lineno=0,
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append=0):
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"""Insert an entry into the list of warnings filters (at the front).
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Use assertions to check that all arguments have the right type."""
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assert action in ("error", "ignore", "always", "default", "module",
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"once"), "invalid action: %s" % `action`
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assert isinstance(message, types.StringType), "message must be a string"
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assert isinstance(category, types.ClassType), "category must be a class"
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assert issubclass(category, Warning), "category must be a Warning subclass"
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assert type(module) is types.StringType, "module must be a string"
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assert type(lineno) is types.IntType and lineno >= 0, \
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"lineno must be an int >= 0"
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item = (action, re.compile(message, re.I), category,
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re.compile(module), lineno)
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if append:
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filters.append(item)
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else:
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filters.insert(0, item)
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def resetwarnings():
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"""Clear the list of warning filters, so that no filters are active."""
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filters[:] = []
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class _OptionError(Exception):
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"""Exception used by option processing helpers."""
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pass
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# Helper to process -W options passed via sys.warnoptions
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def _processoptions(args):
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for arg in args:
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try:
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_setoption(arg)
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except _OptionError, msg:
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print >>sys.stderr, "Invalid -W option ignored:", msg
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# Helper for _processoptions()
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def _setoption(arg):
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parts = arg.split(':')
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if len(parts) > 5:
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raise _OptionError("too many fields (max 5): %s" % `arg`)
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while len(parts) < 5:
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parts.append('')
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action, message, category, module, lineno = [s.strip()
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for s in parts]
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action = _getaction(action)
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message = re.escape(message)
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category = _getcategory(category)
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module = re.escape(module)
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if module:
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module = module + '$'
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if lineno:
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try:
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lineno = int(lineno)
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if lineno < 0:
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raise ValueError
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except (ValueError, OverflowError):
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raise _OptionError("invalid lineno %s" % `lineno`)
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else:
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lineno = 0
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filterwarnings(action, message, category, module, lineno)
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# Helper for _setoption()
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def _getaction(action):
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if not action:
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return "default"
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if action == "all": return "always" # Alias
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for a in ['default', 'always', 'ignore', 'module', 'once', 'error']:
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if a.startswith(action):
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return a
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raise _OptionError("invalid action: %s" % `action`)
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# Helper for _setoption()
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def _getcategory(category):
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if not category:
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return Warning
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if re.match("^[a-zA-Z0-9_]+$", category):
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try:
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cat = eval(category)
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except NameError:
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raise _OptionError("unknown warning category: %s" % `category`)
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else:
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i = category.rfind(".")
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module = category[:i]
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klass = category[i+1:]
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try:
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m = __import__(module, None, None, [klass])
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except ImportError:
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raise _OptionError("invalid module name: %s" % `module`)
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try:
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cat = getattr(m, klass)
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except AttributeError:
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raise _OptionError("unknown warning category: %s" % `category`)
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if (not isinstance(cat, types.ClassType) or
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not issubclass(cat, Warning)):
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raise _OptionError("invalid warning category: %s" % `category`)
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return cat
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# Self-test
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def _test():
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import getopt
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testoptions = []
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try:
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opts, args = getopt.getopt(sys.argv[1:], "W:")
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except getopt.error, msg:
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print >>sys.stderr, msg
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return
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for o, a in opts:
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testoptions.append(a)
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try:
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_processoptions(testoptions)
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except _OptionError, msg:
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print >>sys.stderr, msg
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return
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for item in filters: print item
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hello = "hello world"
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warn(hello); warn(hello); warn(hello); warn(hello)
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warn(hello, UserWarning)
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warn(hello, DeprecationWarning)
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for i in range(3):
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warn(hello)
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filterwarnings("error", "", Warning, "", 0)
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try:
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warn(hello)
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except Exception, msg:
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print "Caught", msg.__class__.__name__ + ":", msg
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else:
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print "No exception"
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resetwarnings()
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try:
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filterwarnings("booh", "", Warning, "", 0)
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except Exception, msg:
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print "Caught", msg.__class__.__name__ + ":", msg
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else:
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print "No exception"
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# Module initialization
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if __name__ == "__main__":
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import __main__
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sys.modules['warnings'] = __main__
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_test()
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else:
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_processoptions(sys.warnoptions)
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filterwarnings("ignore", category=OverflowWarning, append=1)
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