def visit_JoinedStr(self, n: ast3.JoinedStr) -> Expression:
result_expression = StrExpr('') # type: Expression
for value_expr in self.translate_expr_list(n.values):
string_method = MemberExpr(value_expr, '__str__')
string_method.set_line(value_expr)
stringified_value_expr = CallExpr(string_method, [], [])
stringified_value_expr.set_line(value_expr)
result_expression = OpExpr('+', result_expression,
stringified_value_expr)
result_expression.set_line(value_expr)
return result_expression
def _check_str_format_call(
log_msg_expr: t.Union[StrExpr, NameExpr],
ctx: MethodContext,
) -> None:
""" Taps into mypy to typecheck something like this:
```py
logger.debug('The bar is "{my_foo.bar}"', my_foo=foo)
```
as if it was written like this:
```py
logger.debug('The bar is "{my_foo.bar}"'.format(my_foo=foo))
```
"""
call_expr = CallExpr(
callee=MemberExpr(expr=log_msg_expr, name='format'),
args=ctx.args[1] + ctx.args[2],
arg_kinds=ctx.arg_kinds[1] + ctx.arg_kinds[2],
arg_names=ctx.arg_names[1] + ctx.arg_names[2],
)
call_expr.set_line(log_msg_expr)
# WARNING: `ctx.api` *is* technically a `mypy.checker.TypeChecker` so the cast is
# safe to make, however, mypy says this should be an implementation detail.
# So, anything that's not part of the `CheckerPluginInterface` should be expected to
# change. See https://github.com/python/mypy/issues/6617
try:
type_checker = t.cast(TypeChecker, ctx.api)
type_checker.expr_checker.visit_call_expr(call_expr)
except AttributeError:
ctx.api.msg.fail(
("AttributeError when trying to access mypy's functionality. "
'This could mean you are trying to use incompatible versions '
'of mypy and loguru-mypy.'),
context=log_msg_expr,
)
