313 lines
11 KiB
Python
313 lines
11 KiB
Python
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"""engine.SCons.Variables
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This file defines the Variables class that is used to add user-friendly
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customizable variables to an SCons build.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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__revision__ = "src/engine/SCons/Variables/__init__.py 5134 2010/08/16 23:02:40 bdeegan"
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import os.path
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import sys
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import SCons.Environment
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import SCons.Errors
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import SCons.Util
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import SCons.Warnings
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from BoolVariable import BoolVariable # okay
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from EnumVariable import EnumVariable # okay
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from ListVariable import ListVariable # naja
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from PackageVariable import PackageVariable # naja
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from PathVariable import PathVariable # okay
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class Variables(object):
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instance=None
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"""
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Holds all the options, updates the environment with the variables,
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and renders the help text.
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"""
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def __init__(self, files=[], args={}, is_global=1):
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"""
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files - [optional] List of option configuration files to load
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(backward compatibility) If a single string is passed it is
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automatically placed in a file list
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"""
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self.options = []
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self.args = args
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if not SCons.Util.is_List(files):
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if files:
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files = [ files ]
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else:
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files = []
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self.files = files
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self.unknown = {}
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# create the singleton instance
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if is_global:
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self=Variables.instance
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if not Variables.instance:
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Variables.instance=self
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def _do_add(self, key, help="", default=None, validator=None, converter=None):
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class Variable(object):
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pass
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option = Variable()
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# if we get a list or a tuple, we take the first element as the
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# option key and store the remaining in aliases.
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if SCons.Util.is_List(key) or SCons.Util.is_Tuple(key):
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option.key = key[0]
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option.aliases = key[1:]
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else:
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option.key = key
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option.aliases = [ key ]
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option.help = help
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option.default = default
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option.validator = validator
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option.converter = converter
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self.options.append(option)
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# options might be added after the 'unknown' dict has been set up,
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# so we remove the key and all its aliases from that dict
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for alias in list(option.aliases) + [ option.key ]:
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if alias in self.unknown:
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del self.unknown[alias]
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def keys(self):
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"""
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Returns the keywords for the options
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"""
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return [o.key for o in self.options]
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def Add(self, key, help="", default=None, validator=None, converter=None, **kw):
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"""
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Add an option.
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key - the name of the variable, or a list or tuple of arguments
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help - optional help text for the options
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default - optional default value
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validator - optional function that is called to validate the option's value
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Called with (key, value, environment)
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converter - optional function that is called to convert the option's value before
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putting it in the environment.
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"""
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if SCons.Util.is_List(key) or isinstance(key, tuple):
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self._do_add(*key)
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return
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if not SCons.Util.is_String(key) or \
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not SCons.Environment.is_valid_construction_var(key):
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raise SCons.Errors.UserError("Illegal Variables.Add() key `%s'" % str(key))
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self._do_add(key, help, default, validator, converter)
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def AddVariables(self, *optlist):
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"""
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Add a list of options.
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Each list element is a tuple/list of arguments to be passed on
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to the underlying method for adding options.
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Example:
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opt.AddVariables(
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('debug', '', 0),
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('CC', 'The C compiler'),
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('VALIDATE', 'An option for testing validation', 'notset',
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validator, None),
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)
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"""
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for o in optlist:
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self._do_add(*o)
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def Update(self, env, args=None):
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"""
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Update an environment with the option variables.
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env - the environment to update.
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"""
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values = {}
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# first set the defaults:
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for option in self.options:
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if not option.default is None:
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values[option.key] = option.default
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# next set the value specified in the options file
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for filename in self.files:
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if os.path.exists(filename):
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dir = os.path.split(os.path.abspath(filename))[0]
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if dir:
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sys.path.insert(0, dir)
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try:
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values['__name__'] = filename
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exec open(filename, 'rU').read() in {}, values
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finally:
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if dir:
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del sys.path[0]
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del values['__name__']
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# set the values specified on the command line
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if args is None:
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args = self.args
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for arg, value in args.items():
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added = False
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for option in self.options:
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if arg in list(option.aliases) + [ option.key ]:
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values[option.key] = value
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added = True
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if not added:
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self.unknown[arg] = value
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# put the variables in the environment:
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# (don't copy over variables that are not declared as options)
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for option in self.options:
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try:
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env[option.key] = values[option.key]
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except KeyError:
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pass
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# Call the convert functions:
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for option in self.options:
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if option.converter and option.key in values:
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value = env.subst('${%s}'%option.key)
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try:
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try:
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env[option.key] = option.converter(value)
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except TypeError:
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env[option.key] = option.converter(value, env)
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except ValueError, x:
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raise SCons.Errors.UserError('Error converting option: %s\n%s'%(option.key, x))
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# Finally validate the values:
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for option in self.options:
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if option.validator and option.key in values:
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option.validator(option.key, env.subst('${%s}'%option.key), env)
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def UnknownVariables(self):
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"""
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Returns any options in the specified arguments lists that
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were not known, declared options in this object.
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"""
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return self.unknown
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def Save(self, filename, env):
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"""
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Saves all the options in the given file. This file can
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then be used to load the options next run. This can be used
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to create an option cache file.
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filename - Name of the file to save into
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env - the environment get the option values from
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"""
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# Create the file and write out the header
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try:
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fh = open(filename, 'w')
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try:
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# Make an assignment in the file for each option
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# within the environment that was assigned a value
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# other than the default.
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for option in self.options:
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try:
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value = env[option.key]
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try:
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prepare = value.prepare_to_store
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except AttributeError:
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try:
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eval(repr(value))
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except KeyboardInterrupt:
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raise
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except:
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# Convert stuff that has a repr() that
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# cannot be evaluated into a string
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value = SCons.Util.to_String(value)
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else:
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value = prepare()
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defaultVal = env.subst(SCons.Util.to_String(option.default))
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if option.converter:
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defaultVal = option.converter(defaultVal)
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if str(env.subst('${%s}' % option.key)) != str(defaultVal):
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fh.write('%s = %s\n' % (option.key, repr(value)))
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except KeyError:
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pass
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finally:
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fh.close()
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except IOError, x:
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raise SCons.Errors.UserError('Error writing options to file: %s\n%s' % (filename, x))
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def GenerateHelpText(self, env, sort=None):
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"""
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Generate the help text for the options.
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env - an environment that is used to get the current values
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of the options.
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"""
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if sort:
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options = sorted(self.options, key=lambda x: x.key)
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else:
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options = self.options
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def format(opt, self=self, env=env):
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if opt.key in env:
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actual = env.subst('${%s}' % opt.key)
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else:
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actual = None
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return self.FormatVariableHelpText(env, opt.key, opt.help, opt.default, actual, opt.aliases)
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lines = [_f for _f in map(format, options) if _f]
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return ''.join(lines)
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format = '\n%s: %s\n default: %s\n actual: %s\n'
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format_ = '\n%s: %s\n default: %s\n actual: %s\n aliases: %s\n'
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def FormatVariableHelpText(self, env, key, help, default, actual, aliases=[]):
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# Don't display the key name itself as an alias.
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aliases = [a for a in aliases if a != key]
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if len(aliases)==0:
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return self.format % (key, help, default, actual)
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else:
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return self.format_ % (key, help, default, actual, aliases)
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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