| David Tolnay | df344a8 | 2020-05-03 23:23:18 -0700 | [diff] [blame^] | 1 | use quote::ToTokens; |
| 2 | use std::fmt::Display; |
| 3 | use syn::{Error, Result}; |
| 4 | |
| 5 | pub struct Errors { |
| 6 | errors: Vec<Error>, |
| 7 | } |
| 8 | |
| 9 | impl Errors { |
| 10 | pub fn new() -> Self { |
| 11 | Errors { errors: Vec::new() } |
| 12 | } |
| 13 | |
| 14 | pub fn error(&mut self, sp: impl ToTokens, msg: impl Display) { |
| 15 | self.errors.push(Error::new_spanned(sp, msg)); |
| 16 | } |
| 17 | |
| 18 | pub fn propagate(&mut self) -> Result<()> { |
| 19 | let mut iter = self.errors.drain(..); |
| 20 | let mut all_errors = match iter.next() { |
| 21 | Some(err) => err, |
| 22 | None => return Ok(()), |
| 23 | }; |
| 24 | for err in iter { |
| 25 | all_errors.combine(err); |
| 26 | } |
| 27 | Err(all_errors) |
| 28 | } |
| 29 | } |