forked from Orchid/orchid
Lawrence Bethlenfalvy
aebbf51228
- fixed lots of bugs - overlay libraries work correctly and reliably - the STL is an overlay library - examples updated
120 lines
4.0 KiB
Rust
120 lines
4.0 KiB
Rust
#[allow(unused)] // for the doc comments
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use std::any::Any;
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#[allow(unused)] // for the doc comments
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use std::fmt::Debug;
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#[allow(unused)] // for the doc comments
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use dyn_clone::DynClone;
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#[allow(unused)] // for the doc comments
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use crate::define_fn;
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#[allow(unused)] // for the doc comments
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use crate::foreign::{Atomic, ExternFn};
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#[allow(unused)] // for the doc comments
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use crate::write_fn_step;
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#[allow(unused)] // for the doc comments
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use crate::Primitive;
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/// A macro that generates implementations of [Atomic] to simplify the
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/// development of external bindings for Orchid.
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///
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/// Most use cases are fulfilled by [define_fn], pathological cases can combine
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/// [write_fn_step] with manual [Atomic] implementations.
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///
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/// The macro depends on implementations of [`AsRef<Clause>`] and
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/// [`From<(&Self, Clause)>`] for extracting the clause to be processed and then
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/// reconstructing the [Atomic]. Naturally, supertraits of [Atomic] are also
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/// dependencies. These are [Any], [Debug] and [Clone].
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///
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/// The simplest form just requires the typename to be specified. This
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/// additionally depends on an implementation of [ExternFn] because after the
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/// clause is fully normalized it returns `Self` wrapped in a
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/// [Primitive::ExternFn]. It is intended for intermediary stages of the
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/// function where validation and the next state are defined in
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/// [ExternFn::apply].
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///
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/// The last stage of the function should use the extended form of the macro
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/// which takes an additional closure to explicitly describe what happens when
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/// the argument is fully processed.
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///
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/// _definition of the `add` function in the STL_
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/// ```
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/// use orchidlang::{Literal};
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/// use orchidlang::interpreted::ExprInst;
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/// use orchidlang::stl::litconv::with_lit;
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/// use orchidlang::{atomic_impl, atomic_redirect, externfn_impl};
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///
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/// /// Convert a literal to a string using Rust's conversions for floats, chars and
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/// /// uints respectively
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/// #[derive(Clone)]
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/// struct ToString;
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///
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/// externfn_impl!{
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/// ToString, |_: &Self, expr_inst: ExprInst|{
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/// Ok(InternalToString {
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/// expr_inst
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/// })
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/// }
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/// }
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/// #[derive(std::fmt::Debug,Clone)]
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/// struct InternalToString {
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/// expr_inst: ExprInst,
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/// }
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/// atomic_redirect!(InternalToString, expr_inst);
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/// atomic_impl!(InternalToString, |Self { expr_inst }: &Self, _|{
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/// with_lit(expr_inst, |l| Ok(match l {
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/// Literal::Char(c) => c.to_string(),
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/// Literal::Uint(i) => i.to_string(),
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/// Literal::Num(n) => n.to_string(),
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/// Literal::Str(s) => s.clone(),
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/// })).map(|s| Literal::Str(s).into())
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/// });
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/// ```
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#[macro_export]
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macro_rules! atomic_impl {
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($typ:ident) => {
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$crate::atomic_impl! {$typ, |this: &Self, _: $crate::interpreter::Context| {
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use $crate::foreign::ExternFn;
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Ok(this.clone().to_xfn_cls())
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}}
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};
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($typ:ident, $next_phase:expr) => {
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impl $crate::foreign::Atomic for $typ {
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$crate::atomic_defaults! {}
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fn run(
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&self,
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ctx: $crate::interpreter::Context,
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) -> $crate::foreign::AtomicResult {
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// extract the expression
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let expr =
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<Self as AsRef<$crate::interpreted::ExprInst>>::as_ref(self).clone();
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// run the expression
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let ret = $crate::interpreter::run(expr, ctx.clone())?;
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let $crate::interpreter::Return { gas, state, inert } = ret;
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// rebuild the atomic
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let next_self = <Self as From<(
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&Self,
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$crate::interpreted::ExprInst,
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)>>::from((self, state));
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// branch off or wrap up
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let clause = if inert {
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let closure = $next_phase;
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let res: Result<
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$crate::interpreted::Clause,
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std::rc::Rc<dyn $crate::foreign::ExternError>,
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> = closure(&next_self, ctx);
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match res {
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Ok(r) => r,
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Err(e) => return Err($crate::interpreter::RuntimeError::Extern(e)),
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}
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} else {
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next_self.to_atom_cls()
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};
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// package and return
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Ok($crate::foreign::AtomicReturn { clause, gas, inert: false })
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}
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}
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};
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}
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