gmt_dos-actors_dsl 2.1.3

GMT DOS Actors Domain Specific Language
Documentation 
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use std::fmt::Display;

use proc_macro2::Span;
use quote::quote;
use syn::{
    braced,
    parse::{Parse, ParseStream},
    token::Brace,
    Ident,
};

use crate::{client::{ClientKind, SharedClient, System}, Expanded, TryExpand};

mod output;
pub use output::{MaybeOutput, Output};

/// A pair of a client and one ouput
#[derive(Debug, Clone)]
pub struct ClientOutputPair {
    pub client: SharedClient,
    pub output: Option<Output>,
}

impl Display for ClientOutputPair {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if let Some(output) = &self.output {
            if let Some(rate_transition) = &output.rate_transition {
                write!(
                    f,
                    "{}{} -> {}",
                    self.client.actor(),
                    output,
                    rate_transition.actor()
                )
            } else {
                write!(f, "{}{}", self.client.actor(), output)
            }
        } else {
            write!(f, "{}", self.client.actor())
        }
    }
}

impl From<SharedClient> for ClientOutputPair {
    fn from(client: SharedClient) -> Self {
        Self {
            client,
            output: None,
        }
    }
}

impl Parse for ClientOutputPair {
    fn parse(input: ParseStream) -> syn::Result<Self> {
        let client = if input.peek(Brace) {
            let content;
            let _ = braced!(content in input);
            let sys: System = content.parse()?;
            SharedClient::subsystem(sys)
        } else {
            let name: Ident = input.parse()?;
            SharedClient::new(name)
        };
        Ok(Self {
            client,
            output: input.parse::<MaybeOutput>()?.into_inner(),
        })
    }
}

impl TryExpand for ClientOutputPair {
    fn try_expand(&self) -> syn::Result<Expanded> {
        if let Some(output) = self.output.as_ref() {
            let actor = self.client.actor();
            let Output {
                options,
                rate_transition,
                ..
            } = output;
            let name = output.expand_name();
            Some(match (options, rate_transition) {
                (None, None) => {
                    // #actor
                    // .add_output()
                    // .build::<#name>()
                    if let ClientKind::SubSystem(System{  io: Some(io),.. }) = &self.client.borrow().kind {
                        let i = self.client.borrow().input_rate.max(1);
                        let o = self.client.borrow().output_rate;
                        quote! {
                            let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::<#io,#i,#o>::add_output(&mut # actor);
                            let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);
                        }
                    } else {
                        quote!{
                            let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #actor);
                            let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);
                        }
                    }
                },
                (None, Some(client)) => {
                    let sampler = client.actor();
                    quote! {
                        // #actor
                        // .add_output()
                        // .build::<#name>()
                        // .into_input(&mut #sampler)?;
                        // #sampler
                        // .add_output()
                        // .build::<#name>()
                        ::gmt_dos_actors::framework::network::TryIntoInputs::into_input(
                            ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(
                                ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #actor)),
                            &mut #sampler
                        )?;
                        let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #sampler);
                        let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);

                    }
                }
                (Some(options), None) => {
                    // #actor
                    // .add_output()
                    // #(.#options())*
                    // .build::<#name>()
                    if let ClientKind::SubSystem(System{  io: Some(io),.. }) = &self.client.borrow().kind {
                        let i = self.client.borrow().input_rate.max(1);
                        let o = self.client.borrow().output_rate;
                        quote! {
                            let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::<#io,#i,#o>::add_output(&mut # actor);
                            #(let actor_output = ::gmt_dos_actors::framework::network::AddOuput::#options(actor_output);)*
                            let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);
                        }
                    } else {
                        quote!{
                            let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #actor);
                            #(let actor_output = ::gmt_dos_actors::framework::network::AddOuput::#options(actor_output);)*
                            let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);
                        }
                    }
                },
                (Some(options), Some(client)) => {
                    let sampler = client.actor();
                    quote! {
                        // #actor
                        // .add_output()
                        // #(.#options())*
                        // .build::<#name>()
                        // .into_input(&mut #sampler)?;
                        // #sampler
                        // .add_output()
                        // .build::<#name>()
                        let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #actor);
                        #(let actor_output = ::gmt_dos_actors::framework::network::AddOuput::#options(actor_output);)*
                        let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output); 
                        ::gmt_dos_actors::framework::network::TryIntoInputs::into_input(
                            output,
                            &mut #sampler
                        )?;
                        let actor_output = ::gmt_dos_actors::framework::network::AddActorOutput::add_output(&mut #sampler);
                        let output = ::gmt_dos_actors::framework::network::AddOuput::build::<#name>(actor_output);                
                  }
                }
            })
        } else {
            None
        }
        .ok_or(syn::Error::new(Span::call_site(), "no output to quote"))
    }
}