# MIT License
#
# Copyright The SCons Foundation
#
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# a copy of this software and associated documentation files (the
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# 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
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"""Add user-friendly customizable variables to an SCons build. """
import os.path
import sys
from functools import cmp_to_key
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
[docs]class Variables:
"""
Holds all the options, updates the environment with the variables,
and renders the help text.
If is_global is True, this is a singleton, create only once.
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 (Default value = None)
args (optional): dictionary to override values set from *files*.
(Default value = None)
is_global (optional): global instance? (Default value = True)
"""
instance = None
def __init__(self, files=None, args=None, is_global=True):
if args is None:
args = {}
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
[docs] 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)
# options might be added after the 'unknown' dict has been set up,
# so we remove the key and all its aliases from that dict
for alias in list(option.aliases) + [ option.key ]:
if alias in self.unknown:
del self.unknown[alias]
[docs] def keys(self):
"""
Returns the keywords for the options
"""
return [o.key for o in self.options]
[docs] def Add(self, key, help="", default=None, validator=None, converter=None, **kw):
"""Add an option.
Args:
key: the name of the variable, or a list or tuple of arguments
help: optional help text for the options (Default value = "")
default: optional default value for option (Default value = None)
validator: optional function called to validate the option's value
(Default value = None)
converter: optional function to be called to convert the option's
value before putting it in the environment. (Default value = None)
\*\*kw: keyword args, unused.
"""
if SCons.Util.is_List(key) or isinstance(key, tuple):
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)
[docs] 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:
self._do_add(*o)
[docs] 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 option.default is not 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
with open(filename, 'r') as f:
contents = f.read()
exec(contents, {}, 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 list(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 option.key in values:
value = env.subst('${%s}'%option.key)
try:
try:
env[option.key] = option.converter(value)
except TypeError:
env[option.key] = option.converter(value, env)
except ValueError as x:
raise SCons.Errors.UserError('Error converting option: %s\n%s'%(option.key, x))
# Finally validate the values:
for option in self.options:
if option.validator and option.key in values:
option.validator(option.key, env.subst('${%s}'%option.key), env)
[docs] def UnknownVariables(self):
"""
Returns any options in the specified arguments lists that
were not known, declared options in this object.
"""
return self.unknown
[docs] 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('${%s}' % option.key)) != str(defaultVal):
fh.write('%s = %s\n' % (option.key, repr(value)))
except KeyError:
pass
finally:
fh.close()
except IOError as x:
raise SCons.Errors.UserError('Error writing options to file: %s\n%s' % (filename, x))
[docs] def GenerateHelpText(self, env, sort=None):
"""
Generate the help text for the options.
env - an environment that is used to get the current values
of the options.
cmp - Either a function as follows: The specific sort function should take two arguments and return -1, 0 or 1
or a boolean to indicate if it should be sorted.
"""
if callable(sort):
options = sorted(self.options, key=cmp_to_key(lambda x,y: sort(x.key,y.key)))
elif sort is True:
options = sorted(self.options, key=lambda x: x.key)
else:
options = self.options
def format(opt, self=self, env=env):
if opt.key in env:
actual = env.subst('${%s}' % opt.key)
else:
actual = None
return self.FormatVariableHelpText(env, opt.key, opt.help, opt.default, actual, opt.aliases)
lines = [_f for _f in map(format, options) if _f]
return ''.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'
[docs] def FormatVariableHelpText(self, env, key, help, default, actual, aliases=[]):
# Don't display the key name itself as an alias.
aliases = [a for a in aliases if a != key]
if len(aliases)==0:
return self.format % (key, help, default, actual)
else:
return self.format_ % (key, help, default, actual, aliases)
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