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xso-proc: Add support for the codec field on attribute meta

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This allows a custom TextCodec to be used for encoding and decoding the
attribute’s value, instead of FromXmlText and AsOptionalXmlText.
This commit is contained in:
Emmanuel Gil Peyrot 2025-01-25 16:21:22 +01:00
commit 01a0c51a2f
6 changed files with 114 additions and 5 deletions
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36
xso-proc/src/field/attribute.rs
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@ -14,7 +14,10 @@ use syn::*;
use crate::error_message::{self, ParentRef};
use crate::meta::{Flag, NameRef, NamespaceRef};
use crate::scope::{AsItemsScope, FromEventsScope};
use crate::types::{as_optional_xml_text_fn, default_fn, from_xml_text_fn};
use crate::types::{
as_optional_xml_text_fn, default_fn, from_xml_text_fn, text_codec_decode_fn,
text_codec_encode_fn,
};
use super::{Field, FieldBuilderPart, FieldIteratorPart, FieldTempInit};
@ -29,6 +32,9 @@ pub(super) struct AttributeField {
/// Flag indicating whether the value should be defaulted if the
/// attribute is absent.
pub(super) default_: Flag,
/// Optional codec to use.
pub(super) codec: Option<Expr>,
}
impl Field for AttributeField {
@ -53,7 +59,18 @@ impl Field for AttributeField {
},
};
let from_xml_text = from_xml_text_fn(ty.clone());
let finalize = match self.codec {
Some(ref codec) => {
let decode = text_codec_decode_fn(ty.clone());
quote! {
|value| #decode(&#codec, value)
}
}
None => {
let from_xml_text = from_xml_text_fn(ty.clone());
quote! { #from_xml_text }
}
};
let on_absent = match self.default_ {
Flag::Absent => quote! {
@ -70,7 +87,7 @@ impl Field for AttributeField {
Ok(FieldBuilderPart::Init {
value: FieldTempInit {
init: quote! {
match #attrs.remove(#xml_namespace, #xml_name).map(#from_xml_text).transpose()? {
match #attrs.remove(#xml_namespace, #xml_name).map(#finalize).transpose()? {
::core::option::Option::Some(v) => v,
::core::option::Option::None => #on_absent,
}
@ -96,11 +113,20 @@ impl Field for AttributeField {
};
let xml_name = &self.xml_name;
let as_optional_xml_text = as_optional_xml_text_fn(ty.clone());
let generator = match self.codec {
Some(ref codec) => {
let encode = text_codec_encode_fn(ty.clone());
quote! { #encode(&#codec, #bound_name)? }
}
None => {
let as_optional_xml_text = as_optional_xml_text_fn(ty.clone());
quote! { #as_optional_xml_text(#bound_name)? }
}
};
Ok(FieldIteratorPart::Header {
generator: quote! {
#as_optional_xml_text(#bound_name)?.map(|#bound_name| ::xso::Item::Attribute(
#generator.map(|#bound_name| ::xso::Item::Attribute(
#xml_namespace,
::std::borrow::Cow::Borrowed(#xml_name),
#bound_name,