"""
fields = ('node', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
- def as_const(self, eval_ctx=None):
- eval_ctx = get_eval_context(self, eval_ctx)
- if eval_ctx.volatile or eval_ctx.environment.sandboxed:
- raise Impossible()
- obj = self.node.as_const(eval_ctx)
-
- # don't evaluate context functions
- args = [x.as_const(eval_ctx) for x in self.args]
- if isinstance(obj, _context_function_types):
- if getattr(obj, 'contextfunction', False):
- raise Impossible()
- elif getattr(obj, 'evalcontextfunction', False):
- args.insert(0, eval_ctx)
- elif getattr(obj, 'environmentfunction', False):
- args.insert(0, self.environment)
-
- kwargs = dict(x.as_const(eval_ctx) for x in self.kwargs)
- if self.dyn_args is not None:
- try:
- args.extend(self.dyn_args.as_const(eval_ctx))
- except Exception:
- raise Impossible()
- if self.dyn_kwargs is not None:
- try:
- kwargs.update(self.dyn_kwargs.as_const(eval_ctx))
- except Exception:
- raise Impossible()
- try:
- return obj(*args, **kwargs)
- except Exception:
- raise Impossible()
-
class Getitem(Expr):
"""Get an attribute or item from an expression and prefer the item."""