72 lines
1.9 KiB
Rust
72 lines
1.9 KiB
Rust
//! `pest_derive` crate has large dependency tree, and, as a build dependency,
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//! it imposes these deps onto our consumers.
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//!
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//! To avoid that, let's just dump generated code to string into this
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//! repository, and add a test that checks that the code is fresh.
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use std::{
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fs,
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io::Write,
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process::{Command, Stdio},
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};
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const PREAMBLE: &str = "\
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//! This is @generated code, do not edit by hand.
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//! See `graphql.pest` and `tests/codegen.rs`.
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#![allow(unused_attributes)]
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use super::GraphQLParser;
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";
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#[test]
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fn generated_code_is_fresh() {
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let input = format!(
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r###"
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#[derive(Parser)]
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#[grammar = r#"graphql.pest"#]
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struct GraphQLParser;
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"###,
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)
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.parse::<proc_macro2::TokenStream>()
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.unwrap();
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let tokens = pest_generator::derive_parser(input.into(), true);
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let current =
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String::from_utf8(fs::read("./src/parse/generated.rs").unwrap_or_default()).unwrap();
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let normalized = normalize(match current.len() > PREAMBLE.len() {
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true => ¤t[PREAMBLE.len()..],
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false => current.as_str(),
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});
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let new = tokens.to_string();
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let is_up_to_date = normalized == normalize(&new);
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if is_up_to_date {
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return;
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}
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let code = format!("{}\n{}", PREAMBLE, reformat(&new));
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fs::write("./src/parse/generated.rs", code).unwrap();
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panic!("Generated code in the repository is outdated, updating...");
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}
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fn reformat(code: &str) -> String {
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let mut cmd = Command::new("rustfmt")
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.args(&["--config", "tab_spaces=2"])
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()
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.unwrap();
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cmd.stdin
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.take()
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.unwrap()
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.write_all(code.as_bytes())
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.unwrap();
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let output = cmd.wait_with_output().unwrap();
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assert!(output.status.success());
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String::from_utf8(output.stdout).unwrap()
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}
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fn normalize(code: &str) -> String {
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code.replace(|c: char| c.is_ascii_whitespace() || "{},".contains(c), "")
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}
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