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xso-proc: improve spans for error messages

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For codec-based error messages, this reduces the amount of errors per
violation to one. For all others, it improves the placement of the error
slightly, but we still get duplicates.

I couldn't figure out the remaining discrepancies in the spans ...
This commit is contained in:
Jonas Schäfer 2025-05-02 16:56:22 +02:00
commit de39f410d5
5 changed files with 75 additions and 49 deletions
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20
xso-proc/src/field/attribute.rs
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@ -9,8 +9,8 @@
//! In particular, it provides the `#[xml(attribute)]` implementation.
use proc_macro2::Span;
use quote::{quote, ToTokens};
use syn::*;
use quote::{quote, quote_spanned, ToTokens};
use syn::{spanned::Spanned, *};
use std::borrow::Cow;
@ -115,8 +115,9 @@ impl Field for AttributeField {
let finalize = match self.codec {
Some(ref codec) => {
let decode = text_codec_decode_fn(ty.clone());
quote! {
let span = codec.span();
let decode = text_codec_decode_fn(ty.clone(), span);
quote_spanned! { span=>
|value| #decode(&#codec, value)
}
}
@ -170,8 +171,15 @@ impl Field for AttributeField {
let generator = match self.codec {
Some(ref codec) => {
let encode = text_codec_encode_fn(ty.clone());
quote! { #encode(&#codec, #bound_name)? }
let span = codec.span();
let encode = text_codec_encode_fn(ty.clone(), span);
// NOTE: We need to fudge the span of `bound_name` here,
// because its span points outside the macro (the identifier
// of the field), which means that quote_spanned will not
// override it, which would make the error message ugly.
let mut bound_name = bound_name.clone();
bound_name.set_span(span);
quote_spanned! { span=> #encode(&#codec, #bound_name)? }
}
None => {
let as_optional_xml_text = as_optional_xml_text_fn(ty.clone());