summaryrefslogtreecommitdiff
path: root/src/engine/SCons/Variables/EnumVariable.py
diff options
context:
space:
mode:
Diffstat (limited to 'src/engine/SCons/Variables/EnumVariable.py')
-rw-r--r--src/engine/SCons/Variables/EnumVariable.py107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/engine/SCons/Variables/EnumVariable.py b/src/engine/SCons/Variables/EnumVariable.py
new file mode 100644
index 0000000..90ed48e
--- /dev/null
+++ b/src/engine/SCons/Variables/EnumVariable.py
@@ -0,0 +1,107 @@
+"""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 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 4577 2009/12/27 19:44:43 scons"
+
+__all__ = ['EnumVariable',]
+
+import string
+
+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, string.join(allowed_values, '|'))
+ # define validator
+ if ignorecase >= 1:
+ validator = lambda key, val, env, vals=allowed_values: \
+ _validator(key, string.lower(val), env, vals)
+ else:
+ validator = lambda key, val, env, vals=allowed_values: \
+ _validator(key, val, env, vals)
+ # define converter
+ if ignorecase == 2:
+ converter = lambda val, map=map: \
+ string.lower(map.get(string.lower(val), val))
+ elif ignorecase == 1:
+ converter = lambda val, map=map: \
+ map.get(string.lower(val), val)
+ else:
+ converter = lambda val, map=map: \
+ 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: