Macro graphql_value

macro_rules! graphql_value {
    (@array [$($elems:expr,)*]) => { ... };
    (@array [$($elems:expr),*]) => { ... };
    (@array [$($elems:expr,)*] null $($rest:tt)*) => { ... };
    (@array [$($elems:expr,)*] None $($rest:tt)*) => { ... };
    (@array [$($elems:expr,)*] [$($array:tt)*] $($rest:tt)*) => { ... };
    (@array [$($elems:expr,)*] {$($map:tt)*} $($rest:tt)*) => { ... };
    (@array [$($elems:expr,)*] $next:expr, $($rest:tt)*) => { ... };
    (@array [$($elems:expr,)*] $last:expr) => { ... };
    (@array [$($elems:expr),*] , $($rest:tt)*) => { ... };
    (@array [$($elems:expr),*] $unexpected:tt $($rest:tt)*) => { ... };
    (@object $object:ident () () ()) => { ... };
    (@object $object:ident [$($key:tt)+] ($value:expr) , $($rest:tt)*) => { ... };
    (@object $object:ident [$($key:tt)+] ($value:expr) $unexpected:tt $($rest:tt)*) => { ... };
    (@object $object:ident [$($key:tt)+] ($value:expr)) => { ... };
    (@object $object:ident ($($key:tt)+) (: null $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (: None $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (: [$($array:tt)*] $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (: {$($map:tt)*} $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (: $value:expr , $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (: $value:expr) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) (:) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)+) () $copy:tt) => { ... };
    (@object $object:ident () (: $($rest:tt)*) ($colon:tt $($copy:tt)*)) => { ... };
    (@object $object:ident ($($key:tt)*) (, $($rest:tt)*) ($comma:tt $($copy:tt)*)) => { ... };
    (@object $object:ident () (($key:expr) : $($rest:tt)*) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)*) (: $($unexpected:tt)+) $copy:tt) => { ... };
    (@object $object:ident ($($key:tt)*) ($tt:tt $($rest:tt)*) $copy:tt) => { ... };
    (@unexpected) => { ... };
    ([ $($arr:tt)* ]$(,)?) => { ... };
    ({}$(,)?) => { ... };
    ({ $($map:tt)+ }$(,)?) => { ... };
    (null$(,)?) => { ... };
    (None$(,)?) => { ... };
    ($e:expr$(,)?) => { ... };
}

Constructs Values via JSON-like syntax.

Value objects are used mostly when creating custom errors from fields.

Value::Object key should implement AsRef<str>.

let code = 200;
let features = ["key", "value"];

let value: Value = graphql_value!({
    "code": code,
    "success": code == 200,
    "payload": {
        features[0]: features[1],
    },
});

Example

Resulting JSON will look just like what you passed in.

graphql_value!(null);
graphql_value!(1234);
graphql_value!("test");
graphql_value!([1234, "test", true]);
graphql_value!({"key": "value", "foo": 1234});