180 lines
8.2 KiB
Rust
180 lines
8.2 KiB
Rust
//! Module which defines the function registration mechanism.
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#![allow(non_snake_case)]
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use crate::dynamic::{DynamicWriteLock, Variant};
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use crate::fn_native::{CallableFunction, FnAny, FnCallArgs, SendSync};
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use crate::r#unsafe::unsafe_try_cast;
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use crate::stdlib::{any::TypeId, boxed::Box, mem, string::String, vec};
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use crate::{Dynamic, EvalAltResult, NativeCallContext};
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// These types are used to build a unique _marker_ tuple type for each combination
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// of function parameter types in order to make each trait implementation unique.
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// That is because stable Rust currently does not allow distinguishing implementations
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// based purely on parameter types of traits (`Fn`, `FnOnce` and `FnMut`).
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//
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// For example:
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//
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// `NativeFunction<(Mut<A>, B, Ref<C>), R>`
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//
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// will have the function prototype constraint to:
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//
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// `FN: (&mut A, B, &C) -> R`
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//
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// These types are not actually used anywhere.
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pub struct Mut<T>(T);
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//pub struct Ref<T>(T);
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/// Dereference into DynamicWriteLock
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#[inline(always)]
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pub fn by_ref<T: Variant + Clone>(data: &mut Dynamic) -> DynamicWriteLock<T> {
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// Directly cast the &mut Dynamic into DynamicWriteLock to access the underlying data.
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data.write_lock::<T>().unwrap()
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}
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/// Dereference into value.
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#[inline(always)]
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pub fn by_value<T: Variant + Clone>(data: &mut Dynamic) -> T {
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if TypeId::of::<T>() == TypeId::of::<&str>() {
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// If T is `&str`, data must be `ImmutableString`, so map directly to it
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data.flatten_in_place();
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let ref_str = data
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.as_str_ref()
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.expect("argument passed by value should not be shared");
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let ref_t = unsafe { mem::transmute::<_, &T>(&ref_str) };
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ref_t.clone()
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} else if TypeId::of::<T>() == TypeId::of::<String>() {
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// If T is `String`, data must be `ImmutableString`, so map directly to it
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unsafe_try_cast(mem::take(data).take_string().unwrap()).unwrap()
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} else {
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// We consume the argument and then replace it with () - the argument is not supposed to be used again.
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// This way, we avoid having to clone the argument again, because it is already a clone when passed here.
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mem::take(data).cast::<T>()
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}
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}
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/// Trait to register custom Rust functions.
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pub trait RegisterNativeFunction<Args, Result> {
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/// Get the types of this function's parameters.
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fn param_types() -> Box<[TypeId]>;
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/// Convert this function into a [`CallableFunction`].
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fn into_callable_function(self) -> CallableFunction;
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}
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macro_rules! def_register {
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() => {
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def_register!(imp from_pure :);
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};
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(imp $abi:ident : $($par:ident => $arg:expr => $mark:ty => $param:ty => $let:stmt => $clone:expr),*) => {
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// ^ function ABI type
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// ^ function parameter generic type name (A, B, C etc.)
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// ^ call argument(like A, *B, &mut C etc)
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// ^ function parameter marker type (T, Ref<T> or Mut<T>)
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// ^ function parameter actual type (T, &T or &mut T)
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// ^ argument let statement
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impl<
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FN: Fn($($param),*) -> RET + SendSync + 'static,
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$($par: Variant + Clone,)*
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RET: Variant + Clone
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> RegisterNativeFunction<($($mark,)*), ()> for FN {
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#[inline(always)]
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fn param_types() -> Box<[TypeId]> { vec![$(TypeId::of::<$par>()),*].into_boxed_slice() }
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#[inline(always)]
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fn into_callable_function(self) -> CallableFunction {
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CallableFunction::$abi(Box::new(move |_: NativeCallContext, args: &mut FnCallArgs| {
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// The arguments are assumed to be of the correct number and types!
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let mut _drain = args.iter_mut();
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$($let $par = ($clone)(_drain.next().unwrap()); )*
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// Call the function with each argument value
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let r = self($($arg),*);
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// Map the result
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Ok(r.into_dynamic())
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}) as Box<FnAny>)
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}
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}
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impl<
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FN: for<'a> Fn(NativeCallContext<'a>, $($param),*) -> RET + SendSync + 'static,
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$($par: Variant + Clone,)*
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RET: Variant + Clone
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> RegisterNativeFunction<(NativeCallContext<'static>, $($mark,)*), ()> for FN {
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#[inline(always)]
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fn param_types() -> Box<[TypeId]> { vec![$(TypeId::of::<$par>()),*].into_boxed_slice() }
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#[inline(always)]
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fn into_callable_function(self) -> CallableFunction {
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CallableFunction::$abi(Box::new(move |ctx: NativeCallContext, args: &mut FnCallArgs| {
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// The arguments are assumed to be of the correct number and types!
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let mut _drain = args.iter_mut();
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$($let $par = ($clone)(_drain.next().unwrap()); )*
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// Call the function with each argument value
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let r = self(ctx, $($arg),*);
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// Map the result
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Ok(r.into_dynamic())
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}) as Box<FnAny>)
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}
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}
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impl<
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FN: Fn($($param),*) -> Result<RET, Box<EvalAltResult>> + SendSync + 'static,
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$($par: Variant + Clone,)*
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RET: Variant + Clone
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> RegisterNativeFunction<($($mark,)*), Result<RET, Box<EvalAltResult>>> for FN {
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#[inline(always)]
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fn param_types() -> Box<[TypeId]> { vec![$(TypeId::of::<$par>()),*].into_boxed_slice() }
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#[inline(always)]
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fn into_callable_function(self) -> CallableFunction {
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CallableFunction::$abi(Box::new(move |_: NativeCallContext, args: &mut FnCallArgs| {
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// The arguments are assumed to be of the correct number and types!
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let mut _drain = args.iter_mut();
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$($let $par = ($clone)(_drain.next().unwrap()); )*
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// Call the function with each argument value
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self($($arg),*).map(Dynamic::from)
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}) as Box<FnAny>)
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}
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}
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impl<
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FN: for<'a> Fn(NativeCallContext<'a>, $($param),*) -> Result<RET, Box<EvalAltResult>> + SendSync + 'static,
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$($par: Variant + Clone,)*
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RET: Variant + Clone
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> RegisterNativeFunction<(NativeCallContext<'static>, $($mark,)*), Result<RET, Box<EvalAltResult>>> for FN {
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#[inline(always)]
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fn param_types() -> Box<[TypeId]> { vec![$(TypeId::of::<$par>()),*].into_boxed_slice() }
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#[inline(always)]
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fn into_callable_function(self) -> CallableFunction {
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CallableFunction::$abi(Box::new(move |ctx: NativeCallContext, args: &mut FnCallArgs| {
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// The arguments are assumed to be of the correct number and types!
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let mut _drain = args.iter_mut();
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$($let $par = ($clone)(_drain.next().unwrap()); )*
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// Call the function with each argument value
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self(ctx, $($arg),*).map(Dynamic::from)
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}) as Box<FnAny>)
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}
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}
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//def_register!(imp_pop $($par => $mark => $param),*);
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};
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($p0:ident $(, $p:ident)*) => {
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def_register!(imp from_pure : $p0 => $p0 => $p0 => $p0 => let $p0 => by_value $(, $p => $p => $p => $p => let $p => by_value)*);
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def_register!(imp from_method : $p0 => &mut $p0 => Mut<$p0> => &mut $p0 => let mut $p0 => by_ref $(, $p => $p => $p => $p => let $p => by_value)*);
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// ^ CallableFunction constructor
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// ^ first parameter passed through
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// ^ others passed by value (by_value)
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// Currently does not support first argument which is a reference, as there will be
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// conflicting implementations since &T: Any and T: Any cannot be distinguished
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//def_register!(imp $p0 => Ref<$p0> => &$p0 => by_ref $(, $p => $p => $p => by_value)*);
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def_register!($($p),*);
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};
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}
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def_register!(A, B, C, D, E, F, G, H, J, K, L, M, N, P, Q, R, S, T, U, V);
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