text: """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 (c) 2001 - 2016 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/EnumVariable.py rel_2.5.1:3735:9dc6cee5c168 2016/11/03 14:02:02 bdbaddog"
  
  __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:
  