BoolVariable.py.svn-base
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上传日期:2018-11-18
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文件大小:3k
源码类别:
外挂编程
开发平台:
Windows_Unix
- """engine.SCons.Variables.BoolVariable
- This file defines the option type for SCons implementing true/false values.
- Usage example:
- opts = Variables()
- opts.Add(BoolVariable('embedded', 'build for an embedded system', 0))
- ...
- if env['embedded'] == 1:
- ...
- """
- #
- # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
- #
- # Permission is hereby granted, free of charge, to any person obtaining
- # a copy of this software and associated documentation files (the
- # "Software"), to deal in the Software without restriction, including
- # without limitation the rights to use, copy, modify, merge, publish,
- # distribute, sublicense, and/or sell copies of the Software, and to
- # permit persons to whom the Software is furnished to do so, subject to
- # the following conditions:
- #
- # The above copyright notice and this permission notice shall be included
- # in all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
- # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- #
- __revision__ = "src/engine/SCons/Variables/BoolVariable.py 3057 2008/06/09 22:21:00 knight"
- __all__ = ['BoolVariable',]
- import string
- import SCons.compat
- import SCons.Errors
- __true_strings = ('y', 'yes', 'true', 't', '1', 'on' , 'all' )
- __false_strings = ('n', 'no', 'false', 'f', '0', 'off', 'none')
- def _text2bool(val):
- """
- Converts strings to True/False depending on the 'truth' expressed by
- the string. If the string can't be converted, the original value
- will be returned.
- See '__true_strings' and '__false_strings' for values considered
- 'true' or 'false respectivly.
- This is usable as 'converter' for SCons' Variables.
- """
- lval = string.lower(val)
- if lval in __true_strings: return True
- if lval in __false_strings: return False
- raise ValueError("Invalid value for boolean option: %s" % val)
- def _validator(key, val, env):
- """
- Validates the given value to be either '0' or '1'.
- This is usable as 'validator' for SCons' Variables.
- """
- if not env[key] in (True, False):
- raise SCons.Errors.UserError(
- 'Invalid value for boolean option %s: %s' % (key, env[key]))
- def BoolVariable(key, help, default):
- """
- The input parameters describe a boolen option, thus they are
- returned with the correct converter and validator appended. The
- 'help' text will by appended by '(yes|no) to show the valid
- valued. The result is usable for input to opts.Add().
- """
- return (key, '%s (yes|no)' % help, default,
- _validator, _text2bool)