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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 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)