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extern crate proc_macro;
use proc_macro::TokenStream;
use std::{collections::HashMap, fs::File, io::BufReader};
use std::io::prelude::*;
fn readds100() -> HashMap<String, String> {
// who needs obvious filepaths, anyways?
let filename = "./DBNetz-Betriebsstellenverzeichnis-Stand2021-10.csv";
let file = File::open(filename).unwrap();
let reader = BufReader::new(file);
reader.lines()
.filter_map(|l| l.ok())
.skip(1)
.map(|l| {
let segments: Vec<&str> = l
.split(";")
.collect();
(segments[1].to_owned(),segments[2].to_owned())
})
.collect::<HashMap<String,String>>()
}
// rust macros are a strange kind of horrible, tbh
#[proc_macro]
pub fn make_ds100(_item: TokenStream) -> TokenStream {
let symbols = readds100();
format!(
"pub fn ds100(key: &str) -> Option<&str> {{
match key {{
{}
_ => None
}}
}}",
symbols.iter()
.map(|(k,v)| format!("\"{}\" => Some(\"{}\"),",k,v))
.collect::<Vec<_>>()
.join("\n")
).parse().unwrap()
}
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