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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Decorators for argument validation, courtesy of
http://rmi.net/~lutz/rangetest.html
"""
def rangetest(**argchecks): # validate ranges for both+defaults
def onDecorator(func): # onCall remembers func and argchecks
import sys
code = func.__code__ if sys.version_info[0] == 3 else func.func_code
allargs = code.co_varnames[:code.co_argcount]
funcname = func.__name__
def onCall(*pargs, **kargs):
# all pargs match first N args by position
# the rest must be in kargs or omitted defaults
positionals = list(allargs)
positionals = positionals[:len(pargs)]
for (argname, (low, high)) in argchecks.items():
# for all args to be checked
if argname in kargs:
# was passed by name
if float(kargs[argname]) < low or float(kargs[argname]) > high:
errmsg = '{0} argument "{1}" not in {2}..{3}'
errmsg = errmsg.format(funcname, argname, low, high)
raise TypeError(errmsg)
elif argname in positionals:
# was passed by position
position = positionals.index(argname)
if float(pargs[position]) < low or float(pargs[position]) > high:
errmsg = '{0} argument "{1}" with value of {4} not in {2}..{3}'
errmsg = errmsg.format(funcname, argname, low, high, pargs[position])
raise TypeError(errmsg)
else:
pass
return func(*pargs, **kargs) # okay: run original call
return onCall
return onDecorator
def typetest(**argchecks):
def onDecorator(func):
import sys
code = func.__code__ if sys.version_info[0] == 3 else func.func_code
allargs = code.co_varnames[:code.co_argcount]
funcname = func.__name__
def onCall(*pargs, **kargs):
positionals = list(allargs)[:len(pargs)]
for (argname, typeof) in argchecks.items():
if argname in kargs:
if not isinstance(kargs[argname], typeof):
errmsg = '{0} argument "{1}" not of type {2}'
errmsg = errmsg.format(funcname, argname, typeof)
raise TypeError(errmsg)
elif argname in positionals:
position = positionals.index(argname)
if not isinstance(pargs[position], typeof):
errmsg = '{0} argument "{1}" with value of {2} not of type {3}'
errmsg = errmsg.format(funcname, argname, pargs[position], typeof)
raise TypeError(errmsg)
else:
pass
return func(*pargs, **kargs)
return onCall
return onDecorator
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