behaviortree-derive 0.2.0

Derive macros for behaviortree
Documentation 
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// Copyright © 2025 Stephan Kunz

//! Common derive macro implementation

#[doc(hidden)]
extern crate proc_macro;

#[doc(hidden)]
extern crate alloc;

use proc_macro2::TokenStream;
use quote::quote;
use syn::DeriveInput;

/// Implementation of the derive macro
pub fn derive_behavior_struct(input: &DeriveInput, kind: super::Kind) -> TokenStream {
    // structure name
    let ident = &input.ident;
    let (impl_generics, type_generics, where_clause) = input.generics.split_for_impl();

    let derived: TokenStream = "#[automatically_derived]"
        .parse()
        .expect("derive(Behavior) - derived");
    let diagnostic: TokenStream = "#[diagnostic::do_not_recommend]"
        .parse()
        .expect("derive(Behavior) - diagnostic");

    let kind_ = match kind {
        crate::Kind::Action => quote! { behaviortree::behavior::BehaviorKind::Action },
        crate::Kind::Condition => quote! { behaviortree::behavior::BehaviorKind::Condition },
        crate::Kind::Control => quote! { behaviortree::behavior::BehaviorKind::Control },
        crate::Kind::Decorator => quote! { behaviortree::behavior::BehaviorKind::Decorator },
    };

    quote! {
        #derived
        #diagnostic
        impl #impl_generics behaviortree::behavior::Behavior for #ident #type_generics #where_clause {
            fn creation_fn() -> alloc::boxed::Box<behaviortree::behavior::BehaviorCreationFn> {
                alloc::boxed::Box::new(|| alloc::boxed::Box::new(Self::default()))
            }

            fn kind() -> behaviortree::behavior::BehaviorKind {
                #kind_
            }
        }

        #derived
        #diagnostic
        impl #impl_generics behaviortree::behavior::BehaviorExecution for #ident #type_generics #where_clause {
            fn as_any(&self) -> &dyn core::any::Any { self }
            fn as_any_mut(&mut self) -> &mut dyn core::any::Any { self }
            fn static_provided_ports(&self) -> behaviortree::port::PortList { Self::provided_ports() }
        }
    }
}