--- /dev/null
+"""engine.SCons.Variables
+
+This file defines the Variables class that is used to add user-friendly
+customizable variables to an SCons build.
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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/__init__.py 3842 2008/12/20 22:59:52 scons"
+
+import os.path
+import string
+import sys
+
+import SCons.Environment
+import SCons.Errors
+import SCons.Util
+import SCons.Warnings
+
+from BoolVariable import BoolVariable # okay
+from EnumVariable import EnumVariable # okay
+from ListVariable import ListVariable # naja
+from PackageVariable import PackageVariable # naja
+from PathVariable import PathVariable # okay
+
+
+class Variables:
+ instance=None
+
+ """
+ Holds all the options, updates the environment with the variables,
+ and renders the help text.
+ """
+ def __init__(self, files=[], args={}, is_global=1):
+ """
+ files - [optional] List of option configuration files to load
+ (backward compatibility) If a single string is passed it is
+ automatically placed in a file list
+ """
+ self.options = []
+ self.args = args
+ if not SCons.Util.is_List(files):
+ if files:
+ files = [ files ]
+ else:
+ files = []
+ self.files = files
+ self.unknown = {}
+
+ # create the singleton instance
+ if is_global:
+ self=Variables.instance
+
+ if not Variables.instance:
+ Variables.instance=self
+
+ def _do_add(self, key, help="", default=None, validator=None, converter=None):
+ class Variable:
+ pass
+
+ option = Variable()
+
+ # if we get a list or a tuple, we take the first element as the
+ # option key and store the remaining in aliases.
+ if SCons.Util.is_List(key) or SCons.Util.is_Tuple(key):
+ option.key = key[0]
+ option.aliases = key[1:]
+ else:
+ option.key = key
+ option.aliases = [ key ]
+ option.help = help
+ option.default = default
+ option.validator = validator
+ option.converter = converter
+
+ self.options.append(option)
+
+ def keys(self):
+ """
+ Returns the keywords for the options
+ """
+ return map(lambda o: o.key, self.options)
+
+ def Add(self, key, help="", default=None, validator=None, converter=None, **kw):
+ """
+ Add an option.
+
+ key - the name of the variable, or a list or tuple of arguments
+ help - optional help text for the options
+ default - optional default value
+ validator - optional function that is called to validate the option's value
+ Called with (key, value, environment)
+ converter - optional function that is called to convert the option's value before
+ putting it in the environment.
+ """
+
+ if SCons.Util.is_List(key) or type(key) == type(()):
+ apply(self._do_add, key)
+ return
+
+ if not SCons.Util.is_String(key) or \
+ not SCons.Environment.is_valid_construction_var(key):
+ raise SCons.Errors.UserError, "Illegal Variables.Add() key `%s'" % str(key)
+
+ self._do_add(key, help, default, validator, converter)
+
+ def AddVariables(self, *optlist):
+ """
+ Add a list of options.
+
+ Each list element is a tuple/list of arguments to be passed on
+ to the underlying method for adding options.
+
+ Example:
+ opt.AddVariables(
+ ('debug', '', 0),
+ ('CC', 'The C compiler'),
+ ('VALIDATE', 'An option for testing validation', 'notset',
+ validator, None),
+ )
+ """
+ for o in optlist:
+ apply(self._do_add, o)
+
+
+ def Update(self, env, args=None):
+ """
+ Update an environment with the option variables.
+
+ env - the environment to update.
+ """
+
+ values = {}
+
+ # first set the defaults:
+ for option in self.options:
+ if not option.default is None:
+ values[option.key] = option.default
+
+ # next set the value specified in the options file
+ for filename in self.files:
+ if os.path.exists(filename):
+ dir = os.path.split(os.path.abspath(filename))[0]
+ if dir:
+ sys.path.insert(0, dir)
+ try:
+ values['__name__'] = filename
+ execfile(filename, {}, values)
+ finally:
+ if dir:
+ del sys.path[0]
+ del values['__name__']
+
+ # set the values specified on the command line
+ if args is None:
+ args = self.args
+
+ for arg, value in args.items():
+ added = False
+ for option in self.options:
+ if arg in option.aliases + [ option.key ]:
+ values[option.key] = value
+ added = True
+ if not added:
+ self.unknown[arg] = value
+
+ # put the variables in the environment:
+ # (don't copy over variables that are not declared as options)
+ for option in self.options:
+ try:
+ env[option.key] = values[option.key]
+ except KeyError:
+ pass
+
+ # Call the convert functions:
+ for option in self.options:
+ if option.converter and values.has_key(option.key):
+ value = env.subst('${%s}'%option.key)
+ try:
+ try:
+ env[option.key] = option.converter(value)
+ except TypeError:
+ env[option.key] = option.converter(value, env)
+ except ValueError, x:
+ raise SCons.Errors.UserError, 'Error converting option: %s\n%s'%(option.key, x)
+
+
+ # Finally validate the values:
+ for option in self.options:
+ if option.validator and values.has_key(option.key):
+ option.validator(option.key, env.subst('${%s}'%option.key), env)
+
+ def UnknownVariables(self):
+ """
+ Returns any options in the specified arguments lists that
+ were not known, declared options in this object.
+ """
+ return self.unknown
+
+ def Save(self, filename, env):
+ """
+ Saves all the options in the given file. This file can
+ then be used to load the options next run. This can be used
+ to create an option cache file.
+
+ filename - Name of the file to save into
+ env - the environment get the option values from
+ """
+
+ # Create the file and write out the header
+ try:
+ fh = open(filename, 'w')
+
+ try:
+ # Make an assignment in the file for each option
+ # within the environment that was assigned a value
+ # other than the default.
+ for option in self.options:
+ try:
+ value = env[option.key]
+ try:
+ prepare = value.prepare_to_store
+ except AttributeError:
+ try:
+ eval(repr(value))
+ except KeyboardInterrupt:
+ raise
+ except:
+ # Convert stuff that has a repr() that
+ # cannot be evaluated into a string
+ value = SCons.Util.to_String(value)
+ else:
+ value = prepare()
+
+ defaultVal = env.subst(SCons.Util.to_String(option.default))
+ if option.converter:
+ defaultVal = option.converter(defaultVal)
+
+ if str(env.subst('${%s}' % option.key)) != str(defaultVal):
+ fh.write('%s = %s\n' % (option.key, repr(value)))
+ except KeyError:
+ pass
+ finally:
+ fh.close()
+
+ except IOError, x:
+ raise SCons.Errors.UserError, 'Error writing options to file: %s\n%s' % (filename, x)
+
+ def GenerateHelpText(self, env, sort=None):
+ """
+ Generate the help text for the options.
+
+ env - an environment that is used to get the current values
+ of the options.
+ """
+
+ if sort:
+ options = self.options[:]
+ options.sort(lambda x,y,func=sort: func(x.key,y.key))
+ else:
+ options = self.options
+
+ def format(opt, self=self, env=env):
+ if env.has_key(opt.key):
+ actual = env.subst('${%s}' % opt.key)
+ else:
+ actual = None
+ return self.FormatVariableHelpText(env, opt.key, opt.help, opt.default, actual, opt.aliases)
+ lines = filter(None, map(format, options))
+
+ return string.join(lines, '')
+
+ format = '\n%s: %s\n default: %s\n actual: %s\n'
+ format_ = '\n%s: %s\n default: %s\n actual: %s\n aliases: %s\n'
+
+ def FormatVariableHelpText(self, env, key, help, default, actual, aliases=[]):
+ # Don't display the key name itself as an alias.
+ aliases = filter(lambda a, k=key: a != k, aliases)
+ if len(aliases)==0:
+ return self.format % (key, help, default, actual)
+ else:
+ return self.format_ % (key, help, default, actual, aliases)
+
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