data_url_encode_macro_impl/
lib.rs

1extern crate proc_macro;
2
3use syn::{parse_macro_input, LitStr};
4use proc_macro::TokenStream;
5use proc_macro2::Span;
6use quote::quote;
7use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
8use proc_macro_hack::proc_macro_hack;
9
10#[proc_macro_hack]
11pub fn data_url_encode(input: TokenStream) -> TokenStream {
12    let data = parse_macro_input!(input as LitStr).value();
13    let base64_data = base64::encode(data.as_bytes());
14    let encoded_data = utf8_percent_encode(&base64_data, NON_ALPHANUMERIC).to_string();
15    let lit = LitStr::new(&encoded_data, Span::call_site());
16
17    TokenStream::from(quote!(#lit))
18}