enum_lexer_macro/
lib.rs

1
2
3
4mod ast;
5mod gen;
6use syn;
7use ast::EnumLexer;
8use gen::generate;
9use proc_macro::TokenStream;
10use quote::quote;
11
12// use std::process::Command;
13use proc_macro2::Span;
14
15#[proc_macro]
16pub fn enum_lexer(input: TokenStream) -> TokenStream {
17    enum_lexer_optional_bool(input, false)
18}
19
20#[proc_macro]
21pub fn enum_lexer_test(input: TokenStream) -> TokenStream {
22    enum_lexer_optional_bool(input, true)
23}
24
25
26fn enum_lexer_optional_bool(input: TokenStream, test: bool) -> TokenStream {
27    let lexer = syn::parse_macro_input!(input as EnumLexer);
28    match generate(lexer, test) {
29        Ok(stream) => {
30            // let mut file = std::fs::File::create("gen_lexer.rs").unwrap();
31            // use std::io::Write;
32
33            // write!(file, "#![feature(exclusive_range_pattern)]\n").unwrap();
34            // write!(file, "{}", stream).unwrap();
35
36            // Command::new("rustfmt")
37            //     .arg("gen_lexer.rs")
38            //     .spawn().unwrap();
39
40            stream
41        }
42        Err(e) => {
43            let what = syn::LitStr::new(format!("{}", e).as_str(), Span::call_site());
44
45            quote!{
46                compile_error!(#what)
47            }
48        }
49    }.into()
50}
51
52// #[proc_macro]
53// pub fn get_dfa_num(input: TokenStream) -> TokenStream {
54//     let regex = syn::parse_macro_input!(input as syn::LitStr);
55//     let regex = regex.value();
56//     if let Some(i) = gen::get_dfa_num(&regex) {
57//         quote! { #i }
58//     } else {
59//         quote! { compile_error!("regex not found in lexer.") }
60//     }.into()
61// }
enum_lexer_macro/lib.rs

enum_lexer_macro/
lib.rs
