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xso-proc: allow constructing a Compound from processed fields

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This will come in handy when we implement the ability to extract
data from nested children.
This commit is contained in:
Jonas Schäfer 2024-08-01 17:15:36 +02:00
parent e0de035448
commit 5efaabc74b
1 changed files with 27 additions and 17 deletions
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44
xso-proc/src/compound.rs
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@ -23,23 +23,16 @@ pub(crate) struct Compound {
}
impl Compound {
/// Construct a compound from fields.
pub(crate) fn from_fields(compound_fields: &Fields) -> Result<Self> {
let mut fields = Vec::with_capacity(compound_fields.len());
/// Construct a compound from processed field definitions.
pub(crate) fn from_field_defs<I: IntoIterator<Item = Result<FieldDef>>>(
compound_fields: I,
) -> Result<Self> {
let compound_fields = compound_fields.into_iter();
let size_hint = compound_fields.size_hint();
let mut fields = Vec::with_capacity(size_hint.1.unwrap_or(size_hint.0));
let mut text_field = None;
for (i, field) in compound_fields.iter().enumerate() {
let index = match i.try_into() {
Ok(v) => v,
// we are converting to u32, are you crazy?!
// (u32, because syn::Member::Index needs that.)
Err(_) => {
return Err(Error::new_spanned(
field,
"okay, mate, that are way too many fields. get your life together.",
))
}
};
let field = FieldDef::from_field(field, index)?;
for field in compound_fields {
let field = field?;
if field.is_text_field() {
if let Some(other_field) = text_field.as_ref() {
@ -58,10 +51,27 @@ impl Compound {
fields.push(field);
}
Ok(Self { fields })
}
/// Construct a compound from fields.
pub(crate) fn from_fields(compound_fields: &Fields) -> Result<Self> {
Self::from_field_defs(compound_fields.iter().enumerate().map(|(i, field)| {
let index = match i.try_into() {
Ok(v) => v,
// we are converting to u32, are you crazy?!
// (u32, because syn::Member::Index needs that.)
Err(_) => {
return Err(Error::new_spanned(
field,
"okay, mate, that are way too many fields. get your life together.",
))
}
};
FieldDef::from_field(field, index)
}))
}
/// Make and return a set of states which is used to construct the target
/// type from XML events.
///