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Simplify deserializer token stream

This commit is contained in:
Dirkjan Ochtman 2022-09-06 23:24:53 +02:00
parent 6c0cb83189
commit 4b0d5a7698
1 changed files with 85 additions and 92 deletions
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177
instant-xml-macros/src/de.rs
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@ -106,99 +106,92 @@ impl Deserializer {
let attr_type_match = attributes_tokens.match_;
let name = ident.to_string();
let mut out = TokenStream::new();
out.extend(quote!(
fn deserialize<'cx>(deserializer: &'cx mut ::instant_xml::Deserializer<'cx, 'xml>) -> Result<Self, ::instant_xml::Error> {
use ::instant_xml::de::{Deserializer, Id, Visitor, Node};
use ::instant_xml::Error;
use ::core::marker::PhantomData;
enum __Elements {
#elements_enum
__Ignore,
}
enum __Attributes {
#attributes_enum
__Ignore,
}
struct StructVisitor #xml_ty_generics {
marker: PhantomData<#ident #ty_generics>,
lifetime: PhantomData<&'xml ()>,
}
impl #xml_impl_generics Visitor<'xml> for StructVisitor #xml_ty_generics #xml_where_clause {
type Value = #ident #ty_generics;
fn visit_struct<'cx>(
deserializer: &'cx mut Deserializer<'cx, 'xml>,
) -> Result<Self::Value, Error> {
#declare_values
loop {
let node = match deserializer.next() {
Some(result) => result?,
None => break,
};
match node {
Node::Attribute(attr) => {
let id = deserializer.attribute_id(&attr)?;
let field = {
#attributes_consts
match id {
#attributes_names
_ => __Attributes::__Ignore
}
};
match field {
#attr_type_match
__Attributes::__Ignore => {}
}
}
Node::Open(data) => {
let id = deserializer.element_id(&data)?;
let element = {
#elements_consts
match id {
#elements_names
_ => __Elements::__Ignore
}
};
match element {
#elem_type_match
__Elements::__Ignore => {
let mut nested = deserializer.nested(data);
nested.ignore()?;
}
}
}
_ => return Err(Error::UnexpectedState),
}
}
Ok(Self::Value {
#return_val
})
}
}
StructVisitor::visit_struct(deserializer)
}
));
out.extend(quote!(
const KIND: ::instant_xml::de::Kind = ::instant_xml::de::Kind::Element(::instant_xml::de::Id {
ns: #default_namespace,
name: #name,
});
));
out = quote!(
let out = quote!(
impl #xml_impl_generics FromXml<'xml> for #ident #ty_generics #where_clause {
#out
fn deserialize<'cx>(deserializer: &'cx mut ::instant_xml::Deserializer<'cx, 'xml>) -> Result<Self, ::instant_xml::Error> {
use ::instant_xml::de::{Deserializer, Id, Visitor, Node};
use ::instant_xml::Error;
use ::core::marker::PhantomData;
enum __Elements {
#elements_enum
__Ignore,
}
enum __Attributes {
#attributes_enum
__Ignore,
}
struct StructVisitor #xml_ty_generics {
marker: PhantomData<#ident #ty_generics>,
lifetime: PhantomData<&'xml ()>,
}
impl #xml_impl_generics Visitor<'xml> for StructVisitor #xml_ty_generics #xml_where_clause {
type Value = #ident #ty_generics;
fn visit_struct<'cx>(
deserializer: &'cx mut Deserializer<'cx, 'xml>,
) -> Result<Self::Value, Error> {
#declare_values
loop {
let node = match deserializer.next() {
Some(result) => result?,
None => break,
};
match node {
Node::Attribute(attr) => {
let id = deserializer.attribute_id(&attr)?;
let field = {
#attributes_consts
match id {
#attributes_names
_ => __Attributes::__Ignore
}
};
match field {
#attr_type_match
__Attributes::__Ignore => {}
}
}
Node::Open(data) => {
let id = deserializer.element_id(&data)?;
let element = {
#elements_consts
match id {
#elements_names
_ => __Elements::__Ignore
}
};
match element {
#elem_type_match
__Elements::__Ignore => {
let mut nested = deserializer.nested(data);
nested.ignore()?;
}
}
}
_ => return Err(Error::UnexpectedState),
}
}
Ok(Self::Value {
#return_val
})
}
}
StructVisitor::visit_struct(deserializer)
}
const KIND: ::instant_xml::de::Kind = ::instant_xml::de::Kind::Element(::instant_xml::de::Id {
ns: #default_namespace,
name: #name,
});
}
);