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//! Dispatcher Derive Macro Implementation
//!
//! This module provides the `Dispatcher` derive macro for automatically
//! implementing the `mingling::Dispatcher` trait for structs.
use just_fmt::dot_case;
use proc_macro::TokenStream;
use quote::quote;
use syn::{Attribute, DeriveInput, Ident, Lit, Meta, MetaNameValue, parse_macro_input};
/// Parses the `#[dispatcher("path")]` attribute if present
fn parse_dispatcher_attribute(attrs: &[Attribute]) -> Option<String> {
for attr in attrs {
if attr.path().is_ident("dispatcher") {
match attr.parse_args::<Meta>() {
Ok(Meta::NameValue(MetaNameValue {
value:
syn::Expr::Lit(syn::ExprLit {
lit: Lit::Str(lit_str),
..
}),
..
})) => {
return Some(lit_str.value());
}
Ok(_) => {
// If it's not a string literal, we'll use a default
return None;
}
Err(_) => {
// If parsing fails, we'll use a default
return None;
}
}
}
}
None
}
/// Generates the command node path from the struct name or attribute
fn generate_command_path(struct_name: &Ident, attr_path: Option<String>) -> String {
if let Some(path) = attr_path {
path
} else {
// Convert struct name to dot_case for default path using the dot_case! macro
dot_case!(struct_name.to_string())
}
}
/// Implementation of the `Dispatcher` derive macro
pub fn dispatcher_derive(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let struct_name = &input.ident;
// Parse the dispatcher attribute if present
let attr_path = parse_dispatcher_attribute(&input.attrs);
// Generate the command path
let command_path = generate_command_path(struct_name, attr_path);
// Generate the implementation
let expanded = quote! {
impl ::mingling::Dispatcher for #struct_name {
fn node(&self) -> ::mingling::Node {
::mingling::macros::node!(#command_path)
}
}
};
expanded.into()
}
|
