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xso: implement transparent structs

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This commit is contained in:
Jonas Schäfer 2024-08-05 15:32:54 +02:00 • committed by Link Mauve
commit fda4a9ff29
6 changed files with 360 additions and 70 deletions
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38
xso-proc/src/meta.rs
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@ -23,7 +23,7 @@ pub const XMLNS_XML: &str = "http://www.w3.org/XML/1998/namespace";
pub const XMLNS_XMLNS: &str = "http://www.w3.org/2000/xmlns/";
macro_rules! reject_key {
($key:ident not on $not_allowed_on:literal only on $only_allowed_on:literal) => {
($key:ident not on $not_allowed_on:literal $(only on $only_allowed_on:literal)?) => {
if let Some($key) = $key {
return Err(Error::new_spanned(
$key,
@ -32,15 +32,17 @@ macro_rules! reject_key {
stringify!($key),
"` is not allowed on ",
$not_allowed_on,
" (only on ",
$only_allowed_on,
")"
$(
" (only on ",
$only_allowed_on,
")",
)?
),
));
}
};
($key:ident flag not on $not_allowed_on:literal only on $only_allowed_on:literal) => {
($key:ident flag not on $not_allowed_on:literal $(only on $only_allowed_on:literal)?) => {
if let Flag::Present($key) = $key {
return Err(Error::new(
$key,
@ -49,9 +51,11 @@ macro_rules! reject_key {
stringify!($key),
"` is not allowed on ",
$not_allowed_on,
" (only on ",
$only_allowed_on,
")"
$(
" (only on ",
$only_allowed_on,
")",
)?
),
));
}
@ -252,6 +256,13 @@ impl Flag {
Self::Present(_) => true,
}
}
/// Like `Option::take`, but for flags.
pub(crate) fn take(&mut self) -> Self {
let mut result = Flag::Absent;
core::mem::swap(&mut result, self);
result
}
}
impl<T: Spanned> From<T> for Flag {
@ -340,6 +351,9 @@ pub(crate) struct XmlCompoundMeta {
/// The exhaustive flag.
pub(crate) exhaustive: Flag,
/// The transparent flag.
pub(crate) transparent: Flag,
}
impl XmlCompoundMeta {
@ -353,6 +367,7 @@ impl XmlCompoundMeta {
let mut iterator = None;
let mut debug = Flag::Absent;
let mut exhaustive = Flag::Absent;
let mut transparent = Flag::Absent;
attr.parse_nested_meta(|meta| {
if meta.path.is_ident("debug") {
@ -379,6 +394,12 @@ impl XmlCompoundMeta {
}
exhaustive = (&meta.path).into();
Ok(())
} else if meta.path.is_ident("transparent") {
if transparent.is_set() {
return Err(Error::new_spanned(meta.path, "duplicate `transparent` key"));
}
transparent = (&meta.path).into();
Ok(())
} else {
match qname.parse_incremental_from_meta(meta)? {
None => Ok(()),
@ -394,6 +415,7 @@ impl XmlCompoundMeta {
builder,
iterator,
exhaustive,
transparent,
})
}