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|
#[macro_export]
macro_rules! mock {
(
$mock: ident;
impl $mocked_trait: ident for $mocked_trait_target: ident {
$(
fn $func: ident$(<
$($type_param: tt$(: ($($type_param_bound: tt +)+))?),*
>)?(
self: ($($self_type: tt)+),
$($func_param: ident: $func_param_type: ty),*
)$( -> $return_type: ty)?
$(where ($($where: tt)*))?;
)*
}
) => {
$crate::__private::paste! {
mod [<__ $mock>] {
use super::*;
pub struct $mock {
$(
[<$func _expectations>]: std::collections::HashMap<
Vec<$crate::__private::type_id::TypeID>,
[<$mock Expectation _ $func>]$(<$($crate::__to_unit!($type_param)),*>)?
>,
)*
}
impl $mock
{
pub fn new() -> Self
{
Self {
$(
[<$func _expectations>]: std::collections::HashMap::new()
),*
}
}
$(
#[allow(unused)]
pub(crate) fn [<expect_ $func>]$(<
$($type_param$(: $($type_param_bound +)*)?),*
>)?(&mut self)
-> &mut [<$mock Expectation _ $func>]$(<$($type_param),*>)?
$(where $($where)*)?
{
let ids = vec![
$($($crate::__private::type_id::TypeID::of::<$type_param>()),*)?
];
let expectation =
[<$mock Expectation _ $func>]$(::<$($type_param),*>)?::new()
.strip_type_params();
self.[<$func _expectations>].insert(ids.clone(), expectation);
self.[<$func _expectations>]
.get_mut(&ids)
.unwrap()
.with_type_params_mut()
}
)*
}
impl $mocked_trait for $mock {
$(
fn $func$(<$($type_param$(: $($type_param_bound +)+)?),*>)?(
self: $($self_type)+,
$($func_param: $func_param_type),*
)$( -> $return_type)?
$(where $($where)*)?
{
let ids = vec![
$($($crate::__private::type_id::TypeID::of::<$type_param>()),*)?
];
let expectation = self
.[<$func _expectations>]
.get(&ids)
.expect(concat!(
"No expectation found for function ",
stringify!($func)
))
.with_type_params$(::<$($type_param),*>)?();
let Some(returning) = &expectation.returning else {
panic!(concat!(
"Expectation for function",
stringify!($func),
" is missing a function to call")
);
};
returning(self, $($func_param),*)
}
)*
}
$(
#[allow(non_camel_case_types, non_snake_case)]
pub struct [<$mock Expectation _ $func>]$(<$($type_param),*>)? {
returning: Option<
fn(
$crate::__replace_ref_type!($($self_type)*, $mock),
$($func_param_type),*
)$( -> $return_type)?>,
$(
$([<$type_param _phantom>]: std::marker::PhantomData<$type_param>,)*
)?
}
impl$(<$($type_param),*>)? [<$mock Expectation _ $func>]$(<
$($type_param),*
>)? {
#[allow(unused)]
fn new() -> Self {
Self {
returning: None,
$(
$([<$type_param _phantom>]: std::marker::PhantomData,)*
)?
}
}
#[allow(unused)]
pub fn returning(
&mut self,
func: fn(
$crate::__replace_ref_type!($($self_type)*, $mock),
$($func_param_type),*
)$( -> $return_type)?
) -> &mut Self
{
self.returning = Some(func);
self
}
#[allow(unused)]
fn strip_type_params(
self,
) -> [<$mock Expectation _ $func>]$(<$($crate::__to_unit!($type_param)),*>)?
{
$crate::__if_empty_else!(($($($type_param)*)?); {
// No type parameters are present
self
}, {
// Type parameters are present
unsafe { std::mem::transmute(self) }
})
}
}
impl [<$mock Expectation _ $func>]$(<$($crate::__to_unit!($type_param)),*>)? {
fn with_type_params$(<$($type_param),*>)?(
&self,
) -> &[<$mock Expectation _ $func>]$(<$($type_param),*>)?
{
unsafe { &*(self as *const Self).cast() }
}
#[allow(unused)]
fn with_type_params_mut$(<$($type_param),*>)?(
&mut self,
) -> &mut [<$mock Expectation _ $func>]$(<$($type_param),*>)?
{
unsafe { &mut *(self as *mut Self).cast() }
}
}
)*
}
use [<__ $mock>]::$mock;
}
};
}
#[doc(hidden)]
pub mod __private
{
pub use paste::paste;
pub mod type_id
{
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct TypeID
{
id: usize,
}
impl TypeID
{
#[inline]
pub fn of<T>() -> Self
{
Self {
id: Self::of::<T> as usize,
}
}
}
}
#[macro_export]
#[doc(hidden)]
macro_rules! __to_unit {
($anything: tt) => {
()
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __replace_ref_type {
(&$old_type: tt, $new_type: tt) => {
&$new_type
};
(&mut $old_type: tt, $new_type: tt) => {
&mut $new_type
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __if_empty_else {
(($($input: tt)*); $if_empty: block, $else: block) => {
$crate::__if_empty_else!(@($($input)*); $if_empty, $else)
};
// Empty
(@(); $if_empty: block, $else: block) => {
$if_empty
};
// Not empty
(@($($input: tt)+); $if_empty: block, $else: block) => {
$else
};
}
}
|
