# MIT License
#
# Copyright The SCons Foundation
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"""Variable type for enumeration Variables.
Enumeration variables allow selection of one from a specified set of values.
Usage example::
opts = Variables()
opts.Add(
EnumVariable(
'debug',
help='debug output and symbols',
default='no',
allowed_values=('yes', 'no', 'full'),
map={},
ignorecase=2,
)
)
...
if env['debug'] == 'full':
...
"""
from typing import Tuple, Callable
import SCons.Errors
__all__ = ['EnumVariable',]
def _validator(key, val, env, vals) -> None:
if val not in vals:
raise SCons.Errors.UserError(
'Invalid value for option %s: %s. Valid values are: %s' % (key, val, vals))
[docs]def EnumVariable(key, help, default, allowed_values, map={}, ignorecase=0) -> Tuple[str, str, str, Callable, Callable]:
"""Return a tuple describing an enumaration SCons Variable.
The input parameters describe an option with only certain values
allowed. Returns A tuple including an appropriate converter and
validator. The result is usable as input to :meth:`Add`.
*key* and *default* are passed directly on to :meth:`Add`.
*help* is the descriptive part of the help text,
and will have the allowed values automatically appended.
*allowed_values* is a list of strings, which are the allowed values
for this option.
The *map*-dictionary may be used for converting the input value
into canonical values (e.g. for aliases).
The value of *ignorecase* defines the behaviour of the validator:
* 0: the validator/converter are case-sensitive.
* 1: the validator/converter are case-insensitive.
* 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:
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)
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