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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 fetchsymbols() -> HashMap<String, char> {
// who needs obvious filepaths, anyways?
let filename = "symbols";
let file = File::open(filename).unwrap();
let reader = BufReader::new(file);
reader.lines()
.filter_map(|l| l.ok())
.filter_map(|l| {
let segments: Vec<&str> = l
.split_whitespace()
.collect();
match segments[..] {
[] => None,
[s,"code:",code,..] => {
let codepoint = u32::from_str_radix(&code[2..], 16).ok()?;
let unichar = std::char::from_u32(codepoint)?;
Some((s[2..s.len()-1].to_string(), unichar))
},
_ => None,
}
})
.collect::<HashMap<String,char>>()
}
// rust macros are a strange kind of horrible, tbh
#[proc_macro]
pub fn make_symbols(_item: TokenStream) -> TokenStream {
let symbols = fetchsymbols();
format!(
"fn symbol(key: &str) -> Option<char> {{
match key {{
{}
_ => None
}}
}}",
symbols.iter()
.map(|(k,v)| format!("\"{}\" => Some(\'{}\'),",k,v))
.collect::<Vec<_>>()
.join("\n")
).parse().unwrap()
}
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