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//! Dispatcher Chain and Dispatcher Render Macros
//!
//! This module provides macros for creating dispatcher chain and dispatcher render structs
//! with automatic implementations of the `DispatcherChain` trait.
use proc_macro::TokenStream;
use quote::quote;
use syn::parse::{Parse, ParseStream};
use syn::{Ident, Result as SynResult, Token};
/// Parses input in the format: `"command_name", CommandStruct => ChainStruct`
struct DispatcherChainInput {
command_name: syn::LitStr,
command_struct: Ident,
pack: Ident,
}
impl Parse for DispatcherChainInput {
fn parse(input: ParseStream) -> SynResult<Self> {
let command_name = input.parse()?;
input.parse::<Token![,]>()?;
let command_struct = input.parse()?;
input.parse::<Token![=>]>()?;
let pack = input.parse()?;
Ok(DispatcherChainInput {
command_name,
command_struct,
pack,
})
}
}
pub fn dispatcher_chain(input: TokenStream) -> TokenStream {
let DispatcherChainInput {
command_name,
command_struct,
pack,
} = syn::parse_macro_input!(input as DispatcherChainInput);
let command_name_str = command_name.value();
let expanded = quote! {
#[derive(Debug, Default)]
pub struct #command_struct;
::mingling::macros::pack!(#pack = Vec<String>);
impl ::mingling::Dispatcher for #command_struct {
fn node(&self) -> ::mingling::Node {
::mingling::macros::node!(#command_name_str)
}
fn begin(&self, args: Vec<String>) -> ::mingling::ChainProcess {
#pack::new(args).to_chain()
}
fn clone_dispatcher(&self) -> Box<dyn ::mingling::Dispatcher> {
Box::new(#command_struct)
}
}
};
expanded.into()
}
pub fn dispatcher_render(input: TokenStream) -> TokenStream {
let DispatcherChainInput {
command_name,
command_struct,
pack,
} = syn::parse_macro_input!(input as DispatcherChainInput);
let command_name_str = command_name.value();
let expanded = quote! {
#[derive(Debug, Default)]
pub struct #command_struct;
::mingling::macros::pack!(#pack = Vec<String>);
impl ::mingling::Dispatcher for #command_struct {
fn node(&self) -> ::mingling::Node {
::mingling::macros::node!(#command_name_str)
}
fn begin(&self, args: Vec<String>) -> ::mingling::ChainProcess {
#pack::new(args).to_render()
}
fn clone_dispatcher(&self) -> Box<dyn ::mingling::Dispatcher> {
Box::new(#command_struct)
}
}
};
expanded.into()
}
|
