85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""Option type for true/false Variables.
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Usage example::
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opts = Variables()
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opts.Add(BoolVariable('embedded', 'build for an embedded system', 0))
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...
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if env['embedded'] == 1:
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...
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"""
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__all__ = ['BoolVariable',]
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import SCons.Errors
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__true_strings = ('y', 'yes', 'true', 't', '1', 'on' , 'all' )
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__false_strings = ('n', 'no', 'false', 'f', '0', 'off', 'none')
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def _text2bool(val):
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"""
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Converts strings to True/False depending on the 'truth' expressed by
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the string. If the string can't be converted, the original value
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will be returned.
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See '__true_strings' and '__false_strings' for values considered
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'true' or 'false respectively.
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This is usable as 'converter' for SCons' Variables.
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"""
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lval = val.lower()
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if lval in __true_strings: return True
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if lval in __false_strings: return False
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raise ValueError("Invalid value for boolean option: %s" % val)
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def _validator(key, val, env):
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"""
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Validates the given value to be either '0' or '1'.
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This is usable as 'validator' for SCons' Variables.
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"""
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if not env[key] in (True, False):
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raise SCons.Errors.UserError(
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'Invalid value for boolean option %s: %s' % (key, env[key]))
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def BoolVariable(key, help, default):
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"""
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The input parameters describe a boolean option, thus they are
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returned with the correct converter and validator appended. The
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'help' text will by appended by '(yes|no) to show the valid
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valued. The result is usable for input to opts.Add().
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"""
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return (key, '%s (yes|no)' % help, default,
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_validator, _text2bool)
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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