def _check_setting_existence(self, setting_name):
"""
Check that ``setting_name`` is a known setting.
:param setting_name: The setting's name.
:type setting_name: basestring
:raises booleano.exc.GrammarError: If the ``setting_name`` is unknown.
"""
if setting_name not in self.default_settings:
raise GrammarError('Unknown setting "%s"' % setting_name)
def _check_generator_existence(self, generator_name):
"""
Check that ``generator_name`` is a known generator.
:param generator_name: The generator's name.
:type generator_name: basestring
:raises booleano.exc.GrammarError: If the ``generator_name`` is unknown.
"""
if generator_name not in self.known_generators:
raise GrammarError('Unknown generator "%s"' % generator_name)
def _check_token_existence(self, token_name):
"""
Check that ``token_name`` is a known token.
:param token_name: The token's name.
:type token_name: basestring
:raises booleano.exc.GrammarError: If the ``token_name`` is unknown.
"""
if token_name not in self.default_tokens:
raise GrammarError('Unknown token "%s"' % token_name)
def add_parser(self, locale, grammar):
"""
Create a parser for ``grammar`` and store it.
:param locale: The locale of the ``grammar``.
:type locale: basestring
:param grammar: The grammar of the parser to be created.
:type grammar: :class:`Grammar`
"""
if locale in self._parsers:
raise GrammarError("There is already a parser for grammar %s" %
locale)
parser = self._define_parser(locale, grammar)
self._parsers[locale] = parser