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# Copyright 2013-2014 The Meson development team
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re
import functools
import typing as T
from . import compilers
from . import coredata
from . import mesonlib
from . import mparser
from .interpreterbase import FeatureNew
forbidden_option_names = set(coredata.BUILTIN_OPTIONS.keys())
forbidden_prefixes = [lang + '_' for lang in compilers.all_languages] + ['b_', 'backend_']
reserved_prefixes = ['cross_']
def is_invalid_name(name: str, *, log: bool = True) -> bool:
if name in forbidden_option_names:
return True
pref = name.split('_')[0] + '_'
if pref in forbidden_prefixes:
return True
if pref in reserved_prefixes:
if log:
from . import mlog
mlog.deprecation('Option uses prefix "%s", which is reserved for Meson. This will become an error in the future.' % pref)
return False
class OptionException(mesonlib.MesonException):
pass
def permitted_kwargs(permitted):
"""Function that validates kwargs for options."""
def _wraps(func):
@functools.wraps(func)
def _inner(name, description, kwargs):
bad = [a for a in kwargs.keys() if a not in permitted]
if bad:
raise OptionException('Invalid kwargs for option "{}": "{}"'.format(
name, ' '.join(bad)))
return func(description, kwargs)
return _inner
return _wraps
optname_regex = re.compile('[^a-zA-Z0-9_-]')
@permitted_kwargs({'value', 'yield'})
def StringParser(description, kwargs):
return coredata.UserStringOption(description,
kwargs.get('value', ''),
kwargs.get('yield', coredata.default_yielding))
@permitted_kwargs({'value', 'yield'})
def BooleanParser(description, kwargs):
return coredata.UserBooleanOption(description,
kwargs.get('value', True),
kwargs.get('yield', coredata.default_yielding))
@permitted_kwargs({'value', 'yield', 'choices'})
def ComboParser(description, kwargs):
if 'choices' not in kwargs:
raise OptionException('Combo option missing "choices" keyword.')
choices = kwargs['choices']
if not isinstance(choices, list):
raise OptionException('Combo choices must be an array.')
for i in choices:
if not isinstance(i, str):
raise OptionException('Combo choice elements must be strings.')
return coredata.UserComboOption(description,
choices,
kwargs.get('value', choices[0]),
kwargs.get('yield', coredata.default_yielding),)
@permitted_kwargs({'value', 'min', 'max', 'yield'})
def IntegerParser(description, kwargs):
if 'value' not in kwargs:
raise OptionException('Integer option must contain value argument.')
inttuple = (kwargs.get('min', None), kwargs.get('max', None), kwargs['value'])
return coredata.UserIntegerOption(description,
inttuple,
kwargs.get('yield', coredata.default_yielding))
# FIXME: Cannot use FeatureNew while parsing options because we parse it before
# reading options in project(). See func_project() in interpreter.py
#@FeatureNew('array type option()', '0.44.0')
@permitted_kwargs({'value', 'yield', 'choices'})
def string_array_parser(description, kwargs):
if 'choices' in kwargs:
choices = kwargs['choices']
if not isinstance(choices, list):
raise OptionException('Array choices must be an array.')
for i in choices:
if not isinstance(i, str):
raise OptionException('Array choice elements must be strings.')
value = kwargs.get('value', choices)
else:
choices = None
value = kwargs.get('value', [])
if not isinstance(value, list):
raise OptionException('Array choices must be passed as an array.')
return coredata.UserArrayOption(description,
value,
choices=choices,
yielding=kwargs.get('yield', coredata.default_yielding))
@permitted_kwargs({'value', 'yield'})
def FeatureParser(description, kwargs):
return coredata.UserFeatureOption(description,
kwargs.get('value', 'auto'),
yielding=kwargs.get('yield', coredata.default_yielding))
option_types = {'string': StringParser,
'boolean': BooleanParser,
'combo': ComboParser,
'integer': IntegerParser,
'array': string_array_parser,
'feature': FeatureParser,
} # type: T.Dict[str, T.Callable[[str, T.Dict], coredata.UserOption]]
class OptionInterpreter:
def __init__(self, subproject: str) -> None:
self.options = {}
self.subproject = subproject
def process(self, option_file: str) -> None:
try:
with open(option_file, 'r', encoding='utf8') as f:
ast = mparser.Parser(f.read(), option_file).parse()
except mesonlib.MesonException as me:
me.file = option_file
raise me
if not isinstance(ast, mparser.CodeBlockNode):
e = OptionException('Option file is malformed.')
e.lineno = ast.lineno()
e.file = option_file
raise e
for cur in ast.lines:
try:
self.evaluate_statement(cur)
except Exception as e:
e.lineno = cur.lineno
e.colno = cur.colno
e.file = option_file
raise e
def reduce_single(self, arg: T.Union[str, mparser.BaseNode]) -> T.Union[str, int, bool]:
if isinstance(arg, str):
return arg
elif isinstance(arg, (mparser.StringNode, mparser.BooleanNode,
mparser.NumberNode)):
return arg.value
elif isinstance(arg, mparser.ArrayNode):
return [self.reduce_single(curarg) for curarg in arg.args.arguments]
elif isinstance(arg, mparser.UMinusNode):
res = self.reduce_single(arg.value)
if not isinstance(res, (int, float)):
raise OptionException('Token after "-" is not a number')
FeatureNew.single_use('negative numbers in meson_options.txt', '0.54.1', self.subproject)
return -res
elif isinstance(arg, mparser.NotNode):
res = self.reduce_single(arg.value)
if not isinstance(res, bool):
raise OptionException('Token after "not" is not a a boolean')
FeatureNew.single_use('negation ("not") in meson_options.txt', '0.54.1', self.subproject)
return not res
elif isinstance(arg, mparser.ArithmeticNode):
l = self.reduce_single(arg.left)
r = self.reduce_single(arg.right)
if not (arg.operation == 'add' and isinstance(l, str) and isinstance(r, str)):
raise OptionException('Only string concatenation with the "+" operator is allowed')
FeatureNew.single_use('string concatenation in meson_options.txt', '0.55.0', self.subproject)
return l + r
else:
raise OptionException('Arguments may only be string, int, bool, or array of those.')
def reduce_arguments(self, args: mparser.ArgumentNode) -> T.Tuple[T.List[T.Union[str, int, bool]], T.Dict[str, T.Union[str, int, bool]]]:
assert(isinstance(args, mparser.ArgumentNode))
if args.incorrect_order():
raise OptionException('All keyword arguments must be after positional arguments.')
reduced_pos = [self.reduce_single(arg) for arg in args.arguments]
reduced_kw = {}
for key in args.kwargs.keys():
if not isinstance(key, mparser.IdNode):
raise OptionException('Keyword argument name is not a string.')
a = args.kwargs[key]
reduced_kw[key.value] = self.reduce_single(a)
return reduced_pos, reduced_kw
def evaluate_statement(self, node: mparser.BaseNode) -> None:
if not isinstance(node, mparser.FunctionNode):
raise OptionException('Option file may only contain option definitions')
func_name = node.func_name
if func_name != 'option':
raise OptionException('Only calls to option() are allowed in option files.')
(posargs, kwargs) = self.reduce_arguments(node.args)
if 'yield' in kwargs:
FeatureNew.single_use('option yield', '0.45.0', self.subproject)
if 'type' not in kwargs:
raise OptionException('Option call missing mandatory "type" keyword argument')
opt_type = kwargs.pop('type')
if opt_type not in option_types:
raise OptionException('Unknown type %s.' % opt_type)
if len(posargs) != 1:
raise OptionException('Option() must have one (and only one) positional argument')
opt_name = posargs[0]
if not isinstance(opt_name, str):
raise OptionException('Positional argument must be a string.')
if optname_regex.search(opt_name) is not None:
raise OptionException('Option names can only contain letters, numbers or dashes.')
if is_invalid_name(opt_name):
raise OptionException('Option name %s is reserved.' % opt_name)
if self.subproject != '':
opt_name = self.subproject + ':' + opt_name
opt = option_types[opt_type](opt_name, kwargs.pop('description', ''), kwargs)
if opt.description == '':
opt.description = opt_name
self.options[opt_name] = opt
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