mirror of
https://github.com/python/cpython.git
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8501466c7f
Add API function simplefilter() that does not create or install
regular expressions to match message or module. Extend the filters
data structure to store None as an alternative to re.compile("").
Move the _test() function to test_warnings and add some code to try
and avoid disturbing the global state of the warnings module.
260 lines
8.6 KiB
Python
260 lines
8.6 KiB
Python
"""Python part of the warnings subsystem."""
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# Note: function level imports should *not* be used
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# in this module as it may cause import lock deadlock.
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# See bug 683658.
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import sys, types
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import linecache
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__all__ = ["warn", "showwarning", "formatwarning", "filterwarnings",
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"resetwarnings"]
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# filters contains a sequence of filter 5-tuples
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# The components of the 5-tuple are:
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# - an action: error, ignore, always, default, module, or once
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# - a compiled regex that must match the warning message
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# - a class representing the warning category
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# - a compiled regex that must match the module that is being warned
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# - a line number for the line being warning, or 0 to mean any line
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# If either if the compiled regexs are None, match anything.
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filters = []
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defaultaction = "default"
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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 if message is already a Warning object
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if isinstance(message, Warning):
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category = message.__class__
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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 '__name__' in globals:
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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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if isinstance(message, Warning):
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text = str(message)
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category = message.__class__
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else:
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text = message
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message = category(message)
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key = (text, 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 is None or msg.match(text)) and
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issubclass(category, cat) and
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(msg is None or 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 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 = (text, 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 = (text, 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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try:
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file.write(formatwarning(message, category, filename, lineno))
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except IOError:
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pass # the file (probably stderr) is invalid - this warning gets lost.
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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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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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import re
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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, basestring), "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 isinstance(module, basestring), "module must be a string"
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assert isinstance(lineno, int) 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 simplefilter(action, category=Warning, lineno=0, append=0):
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"""Insert a simple entry into the list of warnings filters (at the front).
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A simple filter matches all modules and messages.
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"""
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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(lineno, int) and lineno >= 0, \
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"lineno must be an int >= 0"
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item = (action, None, category, None, 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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import re
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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 + '$'
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if lineno:
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try:
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lineno = int(lineno)
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if lineno < 0:
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raise ValueError
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except (ValueError, OverflowError):
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raise _OptionError("invalid lineno %s" % `lineno`)
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else:
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lineno = 0
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filterwarnings(action, message, category, module, lineno)
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# Helper for _setoption()
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def _getaction(action):
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if not action:
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return "default"
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if action == "all": return "always" # Alias
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for a in ['default', 'always', 'ignore', 'module', 'once', 'error']:
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if a.startswith(action):
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return a
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raise _OptionError("invalid action: %s" % `action`)
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# Helper for _setoption()
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def _getcategory(category):
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import re
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if not category:
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return Warning
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if re.match("^[a-zA-Z0-9_]+$", 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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# 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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simplefilter("ignore", category=OverflowWarning, append=1)
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simplefilter("ignore", category=PendingDeprecationWarning, append=1)
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