ced05a2bb6
This adds a nix-compat-derive derive crate that implements a deriver for NixDeserialize implementations. This is to reduce the amount of code needed to implement deserialization for all the types used by the Nix daemon protocol. Change-Id: I484724b550e8a1d5e9adad9555d9dc1374ae95c2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/12022 Autosubmit: Brian Olsen <me@griff.name> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
use std::cell::RefCell;
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use std::fmt;
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use std::thread::panicking;
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use quote::ToTokens;
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pub struct Context {
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errors: RefCell<Option<Vec<syn::Error>>>,
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}
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impl Context {
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pub fn new() -> Context {
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Context {
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errors: RefCell::new(Some(Vec::new())),
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}
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}
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pub fn syn_error(&self, error: syn::Error) {
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self.errors
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.borrow_mut()
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.as_mut()
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.take()
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.unwrap()
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.push(error);
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}
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pub fn error_spanned<T: ToTokens, D: fmt::Display>(&self, tokens: T, message: D) {
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self.syn_error(syn::Error::new_spanned(tokens, message));
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}
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pub fn check(&self) -> syn::Result<()> {
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let mut iter = self.errors.borrow_mut().take().unwrap().into_iter();
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let mut err = match iter.next() {
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None => return Ok(()),
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Some(err) => err,
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};
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for next_err in iter {
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err.combine(next_err);
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}
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Err(err)
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}
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}
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impl Drop for Context {
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fn drop(&mut self) {
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if self.errors.borrow().is_some() && !panicking() {
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panic!("Context dropped without checking errors");
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}
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}
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}
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