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"""engine.SCons.Options
This file defines the Options class that is used to add user-friendly
customizable variables to an SCons build.
"""
#
# __COPYRIGHT__
#
# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import os.path
import string
import SCons.Errors
import SCons.Util
import SCons.Warnings
from BoolOption import BoolOption, True, False # okay
from EnumOption import EnumOption # okay
from ListOption import ListOption # naja
from PackageOption import PackageOption # naja
from PathOption import PathOption # okay
class Options:
"""
Holds all the options, updates the environment with the variables,
and renders the help text.
"""
def __init__(self, files=None, args={}):
"""
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
self.files = None
if SCons.Util.is_String(files):
self.files = [ files ]
elif files:
self.files = files
def _do_add(self, key, help="", default=None, validator=None, converter=None):
class Option:
pass
option = Option()
option.key = key
option.help = help
option.default = default
option.validator = validator
option.converter = converter
self.options.append(option)
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.Util.is_valid_construction_var(key):
raise SCons.Errors.UserError, "Illegal Options.Add() key `%s'" % str(key)
self._do_add(key, help, default, validator, converter)
def AddOptions(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.AddOptions(
('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
if self.files:
for filename in self.files:
if os.path.exists(filename):
execfile(filename, values)
# finally set the values specified on the command line
if args is None:
args = self.args
values.update(args)
# 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('${%s}'%option.key)
try:
env[option.key] = option.converter(value)
except ValueError, x:
raise SCons.Errors.UserError, 'Error converting option: %s\n%s'%(option.key, x)
# Finally validate the values:
for option in self.options:
if option.validator and values.has_key(option.key):
option.validator(option.key, env.subst('${%s}'%option.key), env)
def 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:
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)
defaultVal = env.subst(SCons.Util.to_String(option.default))
if option.converter:
defaultVal = option.converter(defaultVal)
if str(env.subst('${%s}' % option.key)) != str(defaultVal):
fh.write('%s = %s\n' % (option.key, repr(value)))
except KeyError:
pass
finally:
fh.close()
except IOError, x:
raise SCons.Errors.UserError, 'Error writing options to file: %s\n%s' % (filename, x)
def GenerateHelpText(self, env, sort=None):
"""
Generate the help text for the options.
env - an environment that is used to get the current values
of the options.
"""
help_text = ""
if sort:
options = self.options[:]
options.sort(lambda x,y,func=sort: func(x.key,y.key))
else:
options = self.options
def format(opt, self=self, env=env):
if env.has_key(opt.key):
actual = env.subst('${%s}' % opt.key)
else:
actual = None
return self.FormatOptionHelpText(env, opt.key, opt.help, opt.default, actual)
lines = filter(None, map(format, options))
return string.join(lines, '')
format = '\n%s: %s\n default: %s\n actual: %s\n'
def FormatOptionHelpText(self, env, key, help, default, actual):
return self.format % (key, help, default, actual)
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