build(ariadne): vendor serde crates
This commit was merged in pull request #15.
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/// Construct a `serde_json::Value` from a JSON literal.
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///
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/// ```
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/// # use serde_json::json;
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/// #
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/// let value = json!({
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/// "code": 200,
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/// "success": true,
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/// "payload": {
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/// "features": [
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/// "serde",
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/// "json"
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/// ],
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/// "homepage": null
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/// }
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/// });
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/// ```
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///
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/// Variables or expressions can be interpolated into the JSON literal. Any type
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/// interpolated into an array element or object value must implement Serde's
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/// `Serialize` trait, while any type interpolated into an object key must
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/// implement `Into<String>`. If the `Serialize` implementation of the
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/// interpolated type decides to fail, or if the interpolated type contains a
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/// map with non-string keys, the `json!` macro will panic.
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///
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/// ```
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/// # use serde_json::json;
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/// #
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/// let code = 200;
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/// let features = vec!["serde", "json"];
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///
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/// let value = json!({
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/// "code": code,
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/// "success": code == 200,
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/// "payload": {
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/// features[0]: features[1]
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/// }
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/// });
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/// ```
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///
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/// Trailing commas are allowed inside both arrays and objects.
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///
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/// ```
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/// # use serde_json::json;
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/// #
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/// let value = json!([
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/// "notice",
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/// "the",
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/// "trailing",
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/// "comma -->",
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/// ]);
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/// ```
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#[macro_export]
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macro_rules! json {
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// Hide distracting implementation details from the generated rustdoc.
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($($json:tt)+) => {
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$crate::json_internal!($($json)+)
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};
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}
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// Rocket relies on this because they export their own `json!` with a different
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// doc comment than ours, and various Rust bugs prevent them from calling our
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// `json!` from their `json!` so they call `json_internal!` directly. Check with
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// @SergioBenitez before making breaking changes to this macro.
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//
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// Changes are fine as long as `json_internal!` does not call any new helper
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// macros and can still be invoked as `json_internal!($($json)+)`.
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#[macro_export]
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#[doc(hidden)]
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macro_rules! json_internal {
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//////////////////////////////////////////////////////////////////////////
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// TT muncher for parsing the inside of an array [...]. Produces a vec![...]
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// of the elements.
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//
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// Must be invoked as: json_internal!(@array [] $($tt)*)
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//////////////////////////////////////////////////////////////////////////
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// Done with trailing comma.
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(@array [$($elems:expr,)*]) => {
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$crate::__private::vec![$($elems,)*]
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};
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// Done without trailing comma.
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(@array [$($elems:expr),*]) => {
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$crate::__private::vec![$($elems),*]
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};
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// Next element is `null`.
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(@array [$($elems:expr,)*] null $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!(null)] $($rest)*)
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};
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// Next element is `true`.
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(@array [$($elems:expr,)*] true $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!(true)] $($rest)*)
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};
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// Next element is `false`.
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(@array [$($elems:expr,)*] false $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!(false)] $($rest)*)
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};
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// Next element is an array.
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(@array [$($elems:expr,)*] [$($array:tt)*] $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!([$($array)*])] $($rest)*)
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};
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// Next element is a map.
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(@array [$($elems:expr,)*] {$($map:tt)*} $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!({$($map)*})] $($rest)*)
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};
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// Next element is an expression followed by comma.
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(@array [$($elems:expr,)*] $next:expr, $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!($next),] $($rest)*)
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};
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// Last element is an expression with no trailing comma.
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(@array [$($elems:expr,)*] $last:expr) => {
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$crate::json_internal!(@array [$($elems,)* $crate::json_internal!($last)])
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};
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// Comma after the most recent element.
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(@array [$($elems:expr),*] , $($rest:tt)*) => {
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$crate::json_internal!(@array [$($elems,)*] $($rest)*)
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};
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// Unexpected token after most recent element.
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(@array [$($elems:expr),*] $unexpected:tt $($rest:tt)*) => {
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$crate::json_unexpected!($unexpected)
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};
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//////////////////////////////////////////////////////////////////////////
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// TT muncher for parsing the inside of an object {...}. Each entry is
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// inserted into the given map variable.
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//
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// Must be invoked as: json_internal!(@object $map () ($($tt)*) ($($tt)*))
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//
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// We require two copies of the input tokens so that we can match on one
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// copy and trigger errors on the other copy.
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//////////////////////////////////////////////////////////////////////////
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// Done.
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(@object $object:ident () () ()) => {};
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// Insert the current entry followed by trailing comma.
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(@object $object:ident [$($key:tt)+] ($value:expr) , $($rest:tt)*) => {
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let _ = $object.insert(($($key)+).into(), $value);
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$crate::json_internal!(@object $object () ($($rest)*) ($($rest)*));
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};
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// Current entry followed by unexpected token.
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(@object $object:ident [$($key:tt)+] ($value:expr) $unexpected:tt $($rest:tt)*) => {
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$crate::json_unexpected!($unexpected);
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};
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// Insert the last entry without trailing comma.
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(@object $object:ident [$($key:tt)+] ($value:expr)) => {
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let _ = $object.insert(($($key)+).into(), $value);
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};
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// Next value is `null`.
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(@object $object:ident ($($key:tt)+) (: null $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!(null)) $($rest)*);
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};
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// Next value is `true`.
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(@object $object:ident ($($key:tt)+) (: true $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!(true)) $($rest)*);
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};
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// Next value is `false`.
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(@object $object:ident ($($key:tt)+) (: false $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!(false)) $($rest)*);
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};
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// Next value is an array.
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(@object $object:ident ($($key:tt)+) (: [$($array:tt)*] $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!([$($array)*])) $($rest)*);
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};
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// Next value is a map.
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(@object $object:ident ($($key:tt)+) (: {$($map:tt)*} $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!({$($map)*})) $($rest)*);
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};
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// Next value is an expression followed by comma.
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(@object $object:ident ($($key:tt)+) (: $value:expr , $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!($value)) , $($rest)*);
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};
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// Last value is an expression with no trailing comma.
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(@object $object:ident ($($key:tt)+) (: $value:expr) $copy:tt) => {
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$crate::json_internal!(@object $object [$($key)+] ($crate::json_internal!($value)));
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};
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// Missing value for last entry. Trigger a reasonable error message.
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(@object $object:ident ($($key:tt)+) (:) $copy:tt) => {
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// "unexpected end of macro invocation"
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$crate::json_internal!();
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};
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// Missing colon and value for last entry. Trigger a reasonable error
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// message.
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(@object $object:ident ($($key:tt)+) () $copy:tt) => {
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// "unexpected end of macro invocation"
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$crate::json_internal!();
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};
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// Misplaced colon. Trigger a reasonable error message.
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(@object $object:ident () (: $($rest:tt)*) ($colon:tt $($copy:tt)*)) => {
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// Takes no arguments so "no rules expected the token `:`".
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$crate::json_unexpected!($colon);
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};
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// Found a comma inside a key. Trigger a reasonable error message.
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(@object $object:ident ($($key:tt)*) (, $($rest:tt)*) ($comma:tt $($copy:tt)*)) => {
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// Takes no arguments so "no rules expected the token `,`".
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$crate::json_unexpected!($comma);
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};
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// Key is fully parenthesized. This avoids clippy double_parens false
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// positives because the parenthesization may be necessary here.
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(@object $object:ident () (($key:expr) : $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object ($key) (: $($rest)*) (: $($rest)*));
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};
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// Refuse to absorb colon token into key expression.
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(@object $object:ident ($($key:tt)*) (: $($unexpected:tt)+) $copy:tt) => {
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$crate::json_expect_expr_comma!($($unexpected)+);
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};
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// Munch a token into the current key.
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(@object $object:ident ($($key:tt)*) ($tt:tt $($rest:tt)*) $copy:tt) => {
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$crate::json_internal!(@object $object ($($key)* $tt) ($($rest)*) ($($rest)*));
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};
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//////////////////////////////////////////////////////////////////////////
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// The main implementation.
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//
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// Must be invoked as: json_internal!($($json)+)
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//////////////////////////////////////////////////////////////////////////
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(null) => {
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$crate::Value::Null
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};
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(true) => {
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$crate::Value::Bool(true)
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};
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(false) => {
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$crate::Value::Bool(false)
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};
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([]) => {
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$crate::Value::Array($crate::__private::vec![])
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};
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([ $($tt:tt)+ ]) => {
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$crate::Value::Array($crate::json_internal!(@array [] $($tt)+))
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};
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({}) => {
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$crate::Value::Object($crate::Map::new())
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};
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({ $($tt:tt)+ }) => {
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$crate::Value::Object({
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let mut object = $crate::Map::new();
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$crate::json_internal!(@object object () ($($tt)+) ($($tt)+));
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object
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})
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};
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// Any Serialize type: numbers, strings, struct literals, variables etc.
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// Must be below every other rule.
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($other:expr) => {
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$crate::to_value(&$other).unwrap()
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};
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}
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// Used by old versions of Rocket.
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// Unused since https://github.com/rwf2/Rocket/commit/c74bcfd40a47b35330db6cafb88e4f3da83e0d17
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#[macro_export]
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#[doc(hidden)]
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macro_rules! json_internal_vec {
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($($content:tt)*) => {
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vec![$($content)*]
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};
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}
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#[macro_export]
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#[doc(hidden)]
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macro_rules! json_unexpected {
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() => {};
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}
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#[macro_export]
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#[doc(hidden)]
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macro_rules! json_expect_expr_comma {
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($e:expr , $($tt:tt)*) => {};
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}
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