264 lines
8.7 KiB
Rust
264 lines
8.7 KiB
Rust
/// Construct a `ConstValue`.
|
|
#[macro_export]
|
|
macro_rules! value {
|
|
($($json:tt)+) => {
|
|
$crate::value_internal!($($json)+)
|
|
};
|
|
}
|
|
|
|
#[macro_export]
|
|
#[doc(hidden)]
|
|
macro_rules! value_internal {
|
|
// Done with trailing comma.
|
|
(@array [$($elems:expr,)*]) => {
|
|
$crate::value_internal_vec![$($elems,)*]
|
|
};
|
|
|
|
// Done without trailing comma.
|
|
(@array [$($elems:expr),*]) => {
|
|
$crate::value_internal_vec![$($elems),*]
|
|
};
|
|
|
|
// Next element is `null`.
|
|
(@array [$($elems:expr,)*] null $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!(null)] $($rest)*)
|
|
};
|
|
|
|
// Next element is `true`.
|
|
(@array [$($elems:expr,)*] true $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!(true)] $($rest)*)
|
|
};
|
|
|
|
// Next element is `false`.
|
|
(@array [$($elems:expr,)*] false $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!(false)] $($rest)*)
|
|
};
|
|
|
|
// Next element is an array.
|
|
(@array [$($elems:expr,)*] [$($array:tt)*] $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!([$($array)*])] $($rest)*)
|
|
};
|
|
|
|
// Next element is a map.
|
|
(@array [$($elems:expr,)*] {$($map:tt)*} $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!({$($map)*})] $($rest)*)
|
|
};
|
|
|
|
// Next element is an expression followed by comma.
|
|
(@array [$($elems:expr,)*] $next:expr, $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!($next),] $($rest)*)
|
|
};
|
|
|
|
// Last element is an expression with no trailing comma.
|
|
(@array [$($elems:expr,)*] $last:expr) => {
|
|
$crate::value_internal!(@array [$($elems,)* $crate::value_internal!($last)])
|
|
};
|
|
|
|
// Comma after the most recent element.
|
|
(@array [$($elems:expr),*] , $($rest:tt)*) => {
|
|
$crate::value_internal!(@array [$($elems,)*] $($rest)*)
|
|
};
|
|
|
|
// Unexpected token after most recent element.
|
|
(@array [$($elems:expr),*] $unexpected:tt $($rest:tt)*) => {
|
|
$crate::value_unexpected!($unexpected)
|
|
};
|
|
|
|
// Done.
|
|
(@object $object:ident () () ()) => {};
|
|
|
|
// Insert the current entry followed by trailing comma.
|
|
(@object $object:ident [$($key:tt)+] ($value:expr) , $($rest:tt)*) => {
|
|
let _ = $object.insert($crate::Name::new($($key)+), $value);
|
|
$crate::value_internal!(@object $object () ($($rest)*) ($($rest)*));
|
|
};
|
|
|
|
// Current entry followed by unexpected token.
|
|
(@object $object:ident [$($key:tt)+] ($value:expr) $unexpected:tt $($rest:tt)*) => {
|
|
$crate::value_unexpected!($unexpected);
|
|
};
|
|
|
|
// Insert the last entry without trailing comma.
|
|
(@object $object:ident [$($key:tt)+] ($value:expr)) => {
|
|
let _ = $object.insert($crate::Name::new($($key)+), $value);
|
|
};
|
|
|
|
// Next value is `null`.
|
|
(@object $object:ident ($($key:tt)+) (: null $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!(null)) $($rest)*);
|
|
};
|
|
|
|
// Next value is `true`.
|
|
(@object $object:ident ($($key:tt)+) (: true $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!(true)) $($rest)*);
|
|
};
|
|
|
|
// Next value is `false`.
|
|
(@object $object:ident ($($key:tt)+) (: false $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!(false)) $($rest)*);
|
|
};
|
|
|
|
// Next value is an array.
|
|
(@object $object:ident ($($key:tt)+) (: [$($array:tt)*] $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!([$($array)*])) $($rest)*);
|
|
};
|
|
|
|
// Next value is a map.
|
|
(@object $object:ident ($($key:tt)+) (: {$($map:tt)*} $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!({$($map)*})) $($rest)*);
|
|
};
|
|
|
|
// Next value is an expression followed by comma.
|
|
(@object $object:ident ($($key:tt)+) (: $value:expr , $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!($value)) , $($rest)*);
|
|
};
|
|
|
|
// Last value is an expression with no trailing comma.
|
|
(@object $object:ident ($($key:tt)+) (: $value:expr) $copy:tt) => {
|
|
$crate::value_internal!(@object $object [$($key)+] ($crate::value_internal!($value)));
|
|
};
|
|
|
|
// Missing value for last entry. Trigger a reasonable error message.
|
|
(@object $object:ident ($($key:tt)+) (:) $copy:tt) => {
|
|
// "unexpected end of macro invocation"
|
|
$crate::value_internal!();
|
|
};
|
|
|
|
// Missing colon and value for last entry. Trigger a reasonable error
|
|
// message.
|
|
(@object $object:ident ($($key:tt)+) () $copy:tt) => {
|
|
// "unexpected end of macro invocation"
|
|
$crate::value_internal!();
|
|
};
|
|
|
|
// Misplaced colon. Trigger a reasonable error message.
|
|
(@object $object:ident () (: $($rest:tt)*) ($colon:tt $($copy:tt)*)) => {
|
|
// Takes no arguments so "no rules expected the token `:`".
|
|
$crate::value_unexpected!($colon);
|
|
};
|
|
|
|
// Found a comma inside a key. Trigger a reasonable error message.
|
|
(@object $object:ident ($($key:tt)*) (, $($rest:tt)*) ($comma:tt $($copy:tt)*)) => {
|
|
// Takes no arguments so "no rules expected the token `,`".
|
|
$crate::value_unexpected!($comma);
|
|
};
|
|
|
|
// Key is fully parenthesized. This avoids clippy double_parens false
|
|
// positives because the parenthesization may be necessary here.
|
|
(@object $object:ident () (($key:expr) : $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object ($key) (: $($rest)*) (: $($rest)*));
|
|
};
|
|
|
|
// Refuse to absorb colon token into key expression.
|
|
(@object $object:ident ($($key:tt)*) (: $($unexpected:tt)+) $copy:tt) => {
|
|
$crate::value_expect_expr_comma!($($unexpected)+);
|
|
};
|
|
|
|
// Munch a token into the current key.
|
|
(@object $object:ident ($($key:tt)*) ($tt:tt $($rest:tt)*) $copy:tt) => {
|
|
$crate::value_internal!(@object $object ($($key)* $tt) ($($rest)*) ($($rest)*));
|
|
};
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
// The main implementation.
|
|
//
|
|
// Must be invoked as: value_internal!($($json)+)
|
|
//////////////////////////////////////////////////////////////////////////
|
|
|
|
(null) => {
|
|
$crate::ConstValue::Null
|
|
};
|
|
|
|
(true) => {
|
|
$crate::ConstValue::Boolean(true)
|
|
};
|
|
|
|
(false) => {
|
|
$crate::ConstValue::Boolean(false)
|
|
};
|
|
|
|
([]) => {
|
|
$crate::ConstValue::List($crate::value_internal_vec![])
|
|
};
|
|
|
|
([ $($tt:tt)+ ]) => {
|
|
$crate::ConstValue::List($crate::value_internal!(@array [] $($tt)+))
|
|
};
|
|
|
|
({}) => {
|
|
$crate::ConstValue::Object(Default::default())
|
|
};
|
|
|
|
({ $($tt:tt)+ }) => {
|
|
$crate::ConstValue::Object({
|
|
let mut object = $crate::indexmap::IndexMap::new();
|
|
$crate::value_internal!(@object object () ($($tt)+) ($($tt)+));
|
|
object
|
|
})
|
|
};
|
|
|
|
// Any Serialize type: numbers, strings, struct literals, variables etc.
|
|
// Must be below every other rule.
|
|
($other:expr) => {
|
|
$crate::to_value(&$other).unwrap()
|
|
};
|
|
}
|
|
|
|
#[macro_export]
|
|
#[doc(hidden)]
|
|
macro_rules! value_internal_vec {
|
|
($($content:tt)*) => {
|
|
vec![$($content)*]
|
|
};
|
|
}
|
|
|
|
#[macro_export]
|
|
#[doc(hidden)]
|
|
macro_rules! value_unexpected {
|
|
() => {};
|
|
}
|
|
|
|
#[macro_export]
|
|
#[doc(hidden)]
|
|
macro_rules! value_expect_expr_comma {
|
|
($e:expr , $($tt:tt)*) => {};
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::{ConstValue, Name};
|
|
use indexmap::IndexMap;
|
|
|
|
#[test]
|
|
fn test_macro() {
|
|
assert_eq!(value!(1), ConstValue::Number(1.into()));
|
|
assert_eq!(value!(1 + 2), ConstValue::Number(3.into()));
|
|
assert_eq!(value!("abc"), ConstValue::String("abc".into()));
|
|
assert_eq!(value!(true), ConstValue::Boolean(true));
|
|
assert_eq!(
|
|
value!([1, 2, 3]),
|
|
ConstValue::List(
|
|
(1..=3)
|
|
.into_iter()
|
|
.map(|n| ConstValue::Number(n.into()))
|
|
.collect()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
value!([1, 2, 3,]),
|
|
ConstValue::List(
|
|
(1..=3)
|
|
.into_iter()
|
|
.map(|n| ConstValue::Number(n.into()))
|
|
.collect()
|
|
)
|
|
);
|
|
assert_eq!(value!({"a": 10, "b": true}), {
|
|
let mut map = IndexMap::new();
|
|
map.insert(Name::new("a"), ConstValue::Number(10.into()));
|
|
map.insert(Name::new("b"), ConstValue::Boolean(true));
|
|
ConstValue::Object(map)
|
|
});
|
|
}
|
|
}
|