def make_replacements(match, alternatives):
env = (
match.env
if 'OLD' in match.env
else updated(match.env, [('OLD', match.matched_items)])
)
return ChunkResult(
alternatives.make_substitutions(env),
match.xtail,
match.env
)
def match(self, x, env):
if len(x) >= 1 and self.condition(x[0]):
return [x[0]], x[1:], updated(env, ((self.name, [x[0]]),))
else:
return None, None, None
def match(self, x, env):
matched, xtail, new_env = self.target.match(x, env)
if matched is not None:
new_env = updated(new_env, [(self.name, matched)])
return matched, xtail, new_env
