Macro graphql_input_value

macro_rules! graphql_input_value {
    (@@array [$($elems:expr,)*]) => { ... };
    (@@array [$($elems:expr),*]) => { ... };
    (@@array [$($elems:expr,)*] null $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] None $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] @$var:ident $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] [$($array:tt)*] $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] {$($map:tt)*} $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] $ident:ident, $($rest:tt)*) => { ... };
    (@@array [$($elems:expr,)*] $last:ident ) => { ... };
    (@@array [$($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 $object:ident ($($key:tt)+) (: @$var:ident $($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)+) (: $ident:ident , $($rest:tt)*) $copy:tt) => { ... };
    (@@object $object:ident ($($key:tt)+) (: $last:ident ) $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$(,)?) => { ... };
    (true$(,)?) => { ... };
    (false$(,)?) => { ... };
    (@$var:ident$(,)?) => { ... };
    ($enum:ident$(,)?) => { ... };
    (($e:expr)$(,)?) => { ... };
    ($e:expr$(,)?) => { ... };
}

Constructs InputValues via JSON-like syntax.

Differences from [graphql_value!]

• InputValue::Enum is constructed with ident, so to capture outer variable as InputValue::Scalar surround it with parens: (var).

const OUTER_VAR: i32 = 42;
assert_eq!(graphql_value!(OUTER_VAR), Value::scalar(42));
assert_eq!(graphql_input_value!(OUTER_VAR), InputValue::enum_value("OUTER_VAR"));
assert_eq!(graphql_input_value!((OUTER_VAR)), InputValue::scalar(42));

• InputValue::Variable is constructed by prefixing ident with @.

assert_eq!(graphql_input_value!(@var), InputValue::variable("var"));

• InputValue::Object key should implement Into<String>.

let code = 200;
let features = vec!["key", "value"];
let key: Cow<'static, str> = "key".into();

let value: InputValue = graphql_input_value!({
    "code": code,
    "success": code == 200,
    "payload": {
        features[0]: features[1],
        key: @var,
    },
});

NOTE: InputValue::Lists and InputValue::Objects will be created in a Spanning::unlocated.

Example

graphql_input_value!(null);
graphql_input_value!(1234);
graphql_input_value!("test");
graphql_input_value!([1234, "test", true]);
graphql_input_value!({"key": "value", "foo": 1234});
graphql_input_value!({"key": ENUM});
let captured_var = 42;
graphql_input_value!({"key": (captured_var)});
graphql_input_value!({"key": @variable});