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