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"""engine.SCons.Variables.EnumVariable
This file defines the option type for SCons allowing only specified
input-values.
Usage example:
opts = Variables()
opts.Add(EnumVariable('debug', 'debug output and symbols', 'no',
allowed_values=('yes', 'no', 'full'),
map={}, ignorecase=2))
...
if env['debug'] == 'full':
...
"""
#
# __COPYRIGHT__
#
# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
__all__ = ['EnumVariable',]
import SCons.Errors
def _validator(key, val, env, vals):
if not val in vals:
raise SCons.Errors.UserError(
'Invalid value for option %s: %s. Valid values are: %s' % (key, val, vals))
def EnumVariable(key, help, default, allowed_values, map={}, ignorecase=0):
"""
The input parameters describe an option with only certain values
allowed. They are returned with an appropriate converter and
validator appended. The result is usable for input to
Variables.Add().
'key' and 'default' are the values to be passed on to Variables.Add().
'help' will be appended by the allowed values automatically
'allowed_values' is a list of strings, which are allowed as values
for this option.
The 'map'-dictionary may be used for converting the input value
into canonical values (e.g. for aliases).
'ignorecase' defines the behaviour of the validator:
If ignorecase == 0, the validator/converter are case-sensitive.
If ignorecase == 1, the validator/converter are case-insensitive.
If ignorecase == 2, the validator/converter is case-insensitive and
the converted value will always be lower-case.
The 'validator' tests whether the value is in the list of allowed
values. The 'converter' converts input values according to the
given 'map'-dictionary (unmapped input values are returned
unchanged).
"""
help = '%s (%s)' % (help, '|'.join(allowed_values))
# define validator
if ignorecase >= 1:
validator = lambda key, val, env: \
_validator(key, val.lower(), env, allowed_values)
else:
validator = lambda key, val, env: \
_validator(key, val, env, allowed_values)
# define converter
if ignorecase == 2:
converter = lambda val: map.get(val.lower(), val).lower()
elif ignorecase == 1:
converter = lambda val: map.get(val.lower(), val)
else:
converter = lambda val: map.get(val, val)
return (key, help, default, validator, converter)
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
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