use std::fs;
const PREAMBLE: &str = r#"
//! This is @generated code, do not edit by hand.
//! See `graphql.pest` and `tests/codegen.rs`.
#![allow(unused_attributes)]
use super::GraphQLParser;
"#;
#[test]
fn generated_code_is_fresh() {
let input = r###"
#[derive(Parser)]
#[grammar = r#"graphql.pest"#]
struct GraphQLParser;
"###
.to_string()
.parse::<proc_macro2::TokenStream>()
.unwrap();
let tokens = pest_generator::derive_parser(input, false);
let current = String::from_utf8(fs::read("./src/parse/generated.rs").unwrap()).unwrap();
let current_content = match current.len() > PREAMBLE.len() {
true => ¤t[PREAMBLE.len()..],
false => current.as_str(),
};
let new = tokens.to_string();
let is_up_to_date = normalize(current_content) == normalize(&new);
if is_up_to_date {
return;
}
let code = format!("{}\n{}", PREAMBLE, reformat(&new));
fs::write("./src/parse/generated.rs", code).unwrap();
panic!("Generated code in the repository is outdated, updating...");
}
fn reformat(code: &str) -> String {
let syntax_tree = syn::parse_file(code).unwrap();
prettyplease::unparse(&syntax_tree)
}
fn normalize(code: &str) -> String {
code.replace(|c: char| c.is_ascii_whitespace() || "{},".contains(c), "")
}