"""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, 2009 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 4043 2009/02/23 09:06:45 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) # Local Variables: # tab-width:4 # indent-tabs-mode:nil # End: # vim: set expandtab tabstop=4 shiftwidth=4: