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use proc_macro2::{Span, TokenStream};
use quote::{quote, ToTokens};
#[proc_macro_attribute]
pub fn export_cmd(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let cmd_name = attr.to_string();
let export_cmd_fn = syn::Ident::new(&format!("export_cmd_{}", cmd_name), Span::call_site());
let orig_function: syn::ItemFn = syn::parse2(item.into()).unwrap();
let fn_ident = &orig_function.sig.ident;
let mut new_functions = orig_function.to_token_stream();
new_functions.extend(quote! (
fn #export_cmd_fn() {
export_cmd(#cmd_name, #fn_ident);
}
));
new_functions.into()
}
#[proc_macro]
pub fn use_custom_cmd(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
let mut cmd_fns = vec![];
for t in item {
if let proc_macro::TokenTree::Punct(ch) = t {
if ch.as_char() != ',' {
panic!("only comma is allowed");
}
} else if let proc_macro::TokenTree::Ident(cmd) = t {
let cmd_fn = syn::Ident::new(&format!("export_cmd_{}", cmd), Span::call_site());
cmd_fns.push(cmd_fn);
} else {
panic!("expect a list of comma separated commands");
}
}
quote! (
#(#cmd_fns();)*
)
.into()
}
#[proc_macro]
pub fn use_builtin_cmd(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
let mut ret = TokenStream::new();
for t in item {
if let proc_macro::TokenTree::Punct(ch) = t {
if ch.as_char() != ',' {
panic!("only comma is allowed");
}
} else if let proc_macro::TokenTree::Ident(cmd) = t {
let cmd_name = cmd.to_string();
let cmd_fn = syn::Ident::new(&format!("builtin_{}", cmd_name), Span::call_site());
ret.extend(quote!(::cmd_lib::export_cmd(#cmd_name, ::cmd_lib::#cmd_fn);));
} else {
panic!("expect a list of comma separated commands");
}
}
ret.into()
}
#[proc_macro]
pub fn run_cmd(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let cmds = lexer::Lexer::from(input.into()).scan().parse();
quote! ({
#cmds.run_cmd()
})
.into()
}
#[proc_macro]
pub fn run_fun(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let cmds = lexer::Lexer::from(input.into()).scan().parse();
quote! ({
#cmds.run_fun()
})
.into()
}
#[proc_macro]
pub fn spawn(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let cmds = lexer::Lexer::from(input.into()).scan().parse_for_spawn();
quote! ({
#cmds.spawn()
})
.into()
}
#[proc_macro]
pub fn spawn_with_output(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let cmds = lexer::Lexer::from(input.into()).scan().parse_for_spawn();
quote! ({
#cmds.spawn_with_output()
})
.into()
}
mod lexer;
mod parser;