tera/
macros.rs

1/// Helper macro to get real values out of Value while retaining
2/// proper errors in filters
3///
4/// Takes 4 args:
5///
6/// - the filter name,
7/// - the variable name: use "value" if you are using it on the variable the filter is ran on
8/// - the expected type
9/// - the actual variable
10///
11/// ```no_compile
12/// let arr = try_get_value!("first", "value", Vec<Value>, value);
13/// let val = try_get_value!("pluralize", "suffix", String, val.clone());
14/// ```
15#[macro_export]
16macro_rules! try_get_value {
17    ($filter_name:expr, $var_name:expr, $ty:ty, $val:expr) => {{
18        match $crate::from_value::<$ty>($val.clone()) {
19            Ok(s) => s,
20            Err(_) => {
21                if $var_name == "value" {
22                    return Err($crate::Error::msg(format!(
23                        "Filter `{}` was called on an incorrect value: got `{}` but expected a {}",
24                        $filter_name, $val, stringify!($ty)
25                    )));
26                } else {
27                    return Err($crate::Error::msg(format!(
28                        "Filter `{}` received an incorrect type for arg `{}`: got `{}` but expected a {}",
29                        $filter_name, $var_name, $val, stringify!($ty)
30                    )));
31                }
32            }
33        }
34    }};
35}
tera/macros.rs

tera/
macros.rs
