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|
use super::*;
pub fn writer(
writer: &Writer,
def: metadata::TypeDef,
generics: &[metadata::Type],
ident: &TokenStream,
constraints: &TokenStream,
_phantoms: &TokenStream,
cfg: &cfg::Cfg,
) -> TokenStream {
match def.type_name() {
// If the type is IIterator<T> then simply implement the Iterator trait over top.
metadata::TypeName::IIterator => {
return quote! {
impl<T: windows_core::RuntimeType> Iterator for IIterator<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
let result = self.Current().ok();
if result.is_some() {
self.MoveNext().ok()?;
}
result
}
}
};
}
// If the type is IIterable<T> then implement the IntoIterator trait and rely on the resulting
// IIterator<T> returned by first() to implement the Iterator trait.
metadata::TypeName::IIterable => {
return quote! {
impl<T: windows_core::RuntimeType> IntoIterator for IIterable<T> {
type Item = T;
type IntoIter = IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
impl<T: windows_core::RuntimeType> IntoIterator for &IIterable<T> {
type Item = T;
type IntoIter = IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
// TODO: not sure how to avoid this unwrap, although it should always succeed in practice.
self.First().unwrap()
}
}
};
}
// If the type is IVectorView<T> then provide the VectorViewIterator fast iterator.
metadata::TypeName::IVectorView => {
return quote! {
pub struct VectorViewIterator<T: windows_core::RuntimeType + 'static> {
vector: Option<IVectorView<T>>,
current: u32,
}
impl<T: windows_core::RuntimeType> VectorViewIterator<T> {
pub fn new(vector: Option<IVectorView<T>>) -> Self {
Self { vector, current: 0 }
}
}
impl<T: windows_core::RuntimeType> Iterator for VectorViewIterator<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.vector.as_ref()
.and_then(|vector| {
vector.GetAt(self.current).ok()
})
.and_then(|result| {
self.current += 1;
Some(result)
})
}
}
impl<T: windows_core::RuntimeType> IntoIterator for IVectorView<T> {
type Item = T;
type IntoIter = VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
impl<T: windows_core::RuntimeType> IntoIterator for &IVectorView<T> {
type Item = T;
type IntoIter = VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
// TODO: shouldn't need to clone - VectorViewIterator should hold a reference
VectorViewIterator::new(Some(Clone::clone(self)))
}
}
};
}
metadata::TypeName::IVector => {
return quote! {
pub struct VectorIterator<T: windows_core::RuntimeType + 'static> {
vector: Option<IVector<T>>,
current: u32,
}
impl<T: windows_core::RuntimeType> VectorIterator<T> {
pub fn new(vector: Option<IVector<T>>) -> Self {
Self { vector, current: 0 }
}
}
impl<T: windows_core::RuntimeType> Iterator for VectorIterator<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.vector.as_ref()
.and_then(|vector| {
vector.GetAt(self.current).ok()
})
.and_then(|result| {
self.current += 1;
Some(result)
})
}
}
impl<T: windows_core::RuntimeType> IntoIterator for IVector<T> {
type Item = T;
type IntoIter = VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
impl<T: windows_core::RuntimeType> IntoIterator for &IVector<T> {
type Item = T;
type IntoIter = VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
// TODO: shouldn't need to clone - VectorIterator should hold a reference
VectorIterator::new(Some(Clone::clone(self)))
}
}
};
}
_ => {}
}
let wfc = writer.namespace("Windows.Foundation.Collections");
let mut iterable = None;
let interfaces = metadata::type_interfaces(&metadata::Type::TypeDef(def, generics.to_vec()));
// If the class or interface is not one of the well-known collection interfaces, we then see whether it
// implements any one of them. Here is where we favor IVectorView/IVector over IIterable.
for interface in interfaces {
if let metadata::Type::TypeDef(interface, interface_generics) = &interface.ty {
match interface.type_name() {
metadata::TypeName::IVectorView => {
let item = writer.type_name(&interface_generics[0]);
let mut cfg = cfg.clone();
cfg::type_def_cfg_combine(writer, *interface, interface_generics, &mut cfg);
let features = writer.cfg_features(&cfg);
return quote! {
#features
impl<#constraints> IntoIterator for #ident {
type Item = #item;
type IntoIter = #wfc VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> IntoIterator for &#ident {
type Item = #item;
type IntoIter = #wfc VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
#wfc VectorViewIterator::new(windows_core::Interface::cast(self).ok())
}
}
};
}
metadata::TypeName::IVector => {
let item = writer.type_name(&interface_generics[0]);
let mut cfg = cfg.clone();
cfg::type_def_cfg_combine(writer, *interface, interface_generics, &mut cfg);
let features = writer.cfg_features(&cfg);
return quote! {
#features
impl<#constraints> IntoIterator for #ident {
type Item = #item;
type IntoIter = #wfc VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> IntoIterator for &#ident {
type Item = #item;
type IntoIter = #wfc VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
#wfc VectorIterator::new(windows_core::Interface::cast(self).ok())
}
}
};
}
metadata::TypeName::IIterable => {
iterable = Some((*interface, interface_generics.to_vec()));
}
_ => {}
}
}
}
match iterable {
None => TokenStream::new(),
Some((interface, interface_generics)) => {
let item = writer.type_name(&interface_generics[0]);
let mut cfg = cfg.clone();
cfg::type_def_cfg_combine(writer, interface, &interface_generics, &mut cfg);
let features = writer.cfg_features(&cfg);
quote! {
#features
impl<#constraints> IntoIterator for #ident {
type Item = #item;
type IntoIter = #wfc IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> IntoIterator for &#ident {
type Item = #item;
type IntoIter = #wfc IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
// TODO: not sure how to avoid this unwrap, although it should always succeed in practice.
self.First().unwrap()
}
}
}
}
}
}
|
