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authorLuca Falavigna <dktrkranz@debian.org>2010-01-02 20:31:23 +0100
committerLuca Falavigna <dktrkranz@debian.org>2010-01-02 20:31:23 +0100
commit9b73d2781acfc322319eb5c59b30f2dfa0fea977 (patch)
tree13c84e97c8ba1269d0943782dd195b70502736c9 /engine/SCons/Variables/BoolVariable.py
parent3a672ee94aa5eeb0f1a10b044978c35b13077b67 (diff)
Imported Upstream version 1.2.0.d20091224upstream/1.2.0.d20091224
Diffstat (limited to 'engine/SCons/Variables/BoolVariable.py')
-rw-r--r--engine/SCons/Variables/BoolVariable.py91
1 files changed, 91 insertions, 0 deletions
diff --git a/engine/SCons/Variables/BoolVariable.py b/engine/SCons/Variables/BoolVariable.py
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+++ b/engine/SCons/Variables/BoolVariable.py
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+"""engine.SCons.Variables.BoolVariable
+
+This file defines the option type for SCons implementing true/false values.
+
+Usage example:
+
+ opts = Variables()
+ opts.Add(BoolVariable('embedded', 'build for an embedded system', 0))
+ ...
+ if env['embedded'] == 1:
+ ...
+"""
+
+#
+# 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/BoolVariable.py 4577 2009/12/27 19:43:56 scons"
+
+__all__ = ['BoolVariable',]
+
+import string
+
+import SCons.Errors
+
+__true_strings = ('y', 'yes', 'true', 't', '1', 'on' , 'all' )
+__false_strings = ('n', 'no', 'false', 'f', '0', 'off', 'none')
+
+
+def _text2bool(val):
+ """
+ Converts strings to True/False depending on the 'truth' expressed by
+ the string. If the string can't be converted, the original value
+ will be returned.
+
+ See '__true_strings' and '__false_strings' for values considered
+ 'true' or 'false respectivly.
+
+ This is usable as 'converter' for SCons' Variables.
+ """
+ lval = string.lower(val)
+ if lval in __true_strings: return True
+ if lval in __false_strings: return False
+ raise ValueError("Invalid value for boolean option: %s" % val)
+
+
+def _validator(key, val, env):
+ """
+ Validates the given value to be either '0' or '1'.
+
+ This is usable as 'validator' for SCons' Variables.
+ """
+ if not env[key] in (True, False):
+ raise SCons.Errors.UserError(
+ 'Invalid value for boolean option %s: %s' % (key, env[key]))
+
+
+def BoolVariable(key, help, default):
+ """
+ The input parameters describe a boolen option, thus they are
+ returned with the correct converter and validator appended. The
+ 'help' text will by appended by '(yes|no) to show the valid
+ valued. The result is usable for input to opts.Add().
+ """
+ return (key, '%s (yes|no)' % help, default,
+ _validator, _text2bool)
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: