__init__.py
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上传日期:2018-11-18
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- """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 3057 2008/06/09 22:21:00 knight"
- import SCons.compat
- 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('${%s}'%option.key)
- try:
- try:
- env[option.key] = option.converter(value)
- except TypeError:
- env[option.key] = option.converter(value, env)
- except ValueError, x:
- raise SCons.Errors.UserError, 'Error converting option: %sn%s'%(option.key, x)
- # Finally validate the values:
- for option in self.options:
- if option.validator and values.has_key(option.key):
- option.validator(option.key, env.subst('${%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('${%s}' % option.key)) != str(defaultVal):
- fh.write('%s = %sn' % (option.key, repr(value)))
- except KeyError:
- pass
- finally:
- fh.close()
- except IOError, x:
- raise SCons.Errors.UserError, 'Error writing options to file: %sn%s' % (filename, x)
- def GenerateHelpText(self, env, sort=None):
- """
- Generate the help text for the options.
- env - an environment that is used to get the current values
- of the options.
- """
- if sort:
- options = self.options[:]
- options.sort(lambda x,y,func=sort: func(x.key,y.key))
- else:
- options = self.options
- def format(opt, self=self, env=env):
- if env.has_key(opt.key):
- actual = env.subst('${%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: %sn default: %sn actual: %sn'
- format_ = 'n%s: %sn default: %sn actual: %sn aliases: %sn'
- 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)