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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 `Dispatcher` trait.
use proc_macro::TokenStream;
use quote::quote;
use syn::parse::{Parse, ParseStream};
use syn::{Ident, Result as SynResult, Token};
enum DispatcherChainInput {
Explicit {
group_name: Ident,
command_name: syn::LitStr,
command_struct: Ident,
pack: Ident,
},
Default {
command_name: syn::LitStr,
command_struct: Ident,
pack: Ident,
},
}
impl Parse for DispatcherChainInput {
fn parse(input: ParseStream) -> SynResult<Self> {
let lookahead = input.lookahead1();
if lookahead.peek(Ident) && input.peek2(Token![,]) && input.peek3(syn::LitStr) {
let group_name = input.parse()?;
input.parse::<Token![,]>()?;
let command_name = input.parse()?;
input.parse::<Token![,]>()?;
let command_struct = input.parse()?;
input.parse::<Token![=>]>()?;
let pack = input.parse()?;
Ok(DispatcherChainInput::Explicit {
group_name,
command_name,
command_struct,
pack,
})
} else if lookahead.peek(syn::LitStr) {
// Default format: "command_name", CommandStruct => ChainStruct
let command_name = input.parse()?;
input.parse::<Token![,]>()?;
let command_struct = input.parse()?;
input.parse::<Token![=>]>()?;
let pack = input.parse()?;
Ok(DispatcherChainInput::Default {
command_name,
command_struct,
pack,
})
} else {
Err(lookahead.error())
}
}
}
// NOTICE: This implementation contains significant code duplication between the explicit
// and default cases in both `dispatcher_chain` and `dispatcher_render` functions.
// The logic for handling default vs explicit group names and generating the appropriate
// code should be extracted into common helper functions to reduce redundancy.
// Additionally, the token stream generation patterns are nearly identical between
// the two main functions and could benefit from refactoring.
pub fn dispatcher_chain(input: TokenStream) -> TokenStream {
// Parse the input
let dispatcher_input = syn::parse_macro_input!(input as DispatcherChainInput);
// Determine if we're using default or explicit group
let (group_name, command_name, command_struct, pack, use_default) = match dispatcher_input {
DispatcherChainInput::Explicit {
group_name,
command_name,
command_struct,
pack,
} => (group_name, command_name, command_struct, pack, false),
DispatcherChainInput::Default {
command_name,
command_struct,
pack,
} => (
Ident::new("ThisProgram", proc_macro2::Span::call_site()),
command_name,
command_struct,
pack,
true,
),
};
let command_name_str = command_name.value();
let comp_entry = get_comp_entry(&pack);
let expanded = if use_default {
// For default case, use ThisProgram
quote! {
#[derive(Debug, Default)]
pub struct #command_struct;
::mingling::macros::pack!(ThisProgram, #pack = Vec<String>);
#comp_entry
impl ::mingling::Dispatcher<ThisProgram> for #command_struct {
fn node(&self) -> ::mingling::Node {
::mingling::macros::node!(#command_name_str)
}
fn begin(&self, args: Vec<String>) -> ::mingling::ChainProcess<ThisProgram> {
#pack::new(args).to_chain()
}
fn clone_dispatcher(&self) -> Box<dyn ::mingling::Dispatcher<ThisProgram>> {
Box::new(#command_struct)
}
}
}
} else {
// For explicit case, use the provided group_name
quote! {
#[derive(Debug, Default)]
pub struct #command_struct;
::mingling::macros::pack!(#group_name, #pack = Vec<String>);
#comp_entry
impl ::mingling::Dispatcher<#group_name> for #command_struct {
fn node(&self) -> ::mingling::Node {
::mingling::macros::node!(#command_name_str)
}
fn begin(&self, args: Vec<String>) -> ::mingling::ChainProcess<#group_name> {
#pack::new(args).to_chain()
}
fn clone_dispatcher(&self) -> Box<dyn ::mingling::Dispatcher<#group_name>> {
Box::new(#command_struct)
}
}
}
};
expanded.into()
}
#[cfg(feature = "comp")]
fn get_comp_entry(entry_name: &Ident) -> proc_macro2::TokenStream {
let comp_entry = quote! {
impl ::mingling::CompletionEntry for #entry_name {
fn get_input(self) -> Vec<String> {
self.inner.clone()
}
}
};
comp_entry
}
#[cfg(not(feature = "comp"))]
fn get_comp_entry(_entry_name: &Ident) -> proc_macro2::TokenStream {
quote! {}
}
|
