Added an unmodified copy of SCons to third_party.

scons-2.0.1/engine/SCons/Variables/EnumVariable.py

+"""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, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 5134 2010/08/16 23:02:40 bdeegan"
+
+__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' % (key, val))
+
+
+def EnumVariable(key, help, default, allowed_values, map={}, ignorecase=0):
+    """
+    The input parameters describe a 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 (eg. 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: