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use super::*;
// Provides iterator support for the well-known WinRT collection interfaces and any classes or
// interfaces that implement any of these interfaces. It also favors high-speed iteration and
// only falls back to IIterator<T> if nothing faster is available. VectorIterator and
// VectorViewIterator are faster iterators than IIterator<T> because they only require a single
// vcall per iteration whereas IIterator<T> requires two.
pub fn gen_iterator(def: &TypeDef, interfaces: &[InterfaceInfo], gen: &Gen) -> TokenStream {
match def.type_name() {
// If the type is IIterator<T> then simply implement the Iterator trait over top.
TypeName::IIterator => {
return quote! {
impl<T: ::windows::runtime::RuntimeType> ::std::iter::Iterator for IIterator<T> {
type Item = T;
fn next(&mut self) -> ::std::option::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.
TypeName::IIterable => {
return quote! {
impl<T: ::windows::runtime::RuntimeType> ::std::iter::IntoIterator for IIterable<T> {
type Item = T;
type IntoIter = IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
impl<T: ::windows::runtime::RuntimeType> ::std::iter::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.
TypeName::IVectorView => {
return quote! {
pub struct VectorViewIterator<T: ::windows::runtime::RuntimeType + 'static> {
vector: ::std::option::Option<IVectorView<T>>,
current: u32,
}
impl<T: ::windows::runtime::RuntimeType> VectorViewIterator<T> {
pub fn new(vector: ::std::option::Option<IVectorView<T>>) -> Self {
Self { vector, current: 0 }
}
}
impl<T: ::windows::runtime::RuntimeType> ::std::iter::Iterator for VectorViewIterator<T> {
type Item = T;
fn next(&mut self) -> ::std::option::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::runtime::RuntimeType> ::std::iter::IntoIterator for IVectorView<T> {
type Item = T;
type IntoIter = VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
impl<T: ::windows::runtime::RuntimeType> ::std::iter::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(::std::option::Option::Some(::std::clone::Clone::clone(self)))
}
}
};
}
TypeName::IVector => {
return quote! {
pub struct VectorIterator<T: ::windows::runtime::RuntimeType + 'static> {
vector: ::std::option::Option<IVector<T>>,
current: u32,
}
impl<T: ::windows::runtime::RuntimeType> VectorIterator<T> {
pub fn new(vector: ::std::option::Option<IVector<T>>) -> Self {
Self { vector, current: 0 }
}
}
impl<T: ::windows::runtime::RuntimeType> ::std::iter::Iterator for VectorIterator<T> {
type Item = T;
fn next(&mut self) -> ::std::option::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::runtime::RuntimeType> ::std::iter::IntoIterator for IVector<T> {
type Item = T;
type IntoIter = VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
impl<T: ::windows::runtime::RuntimeType> ::std::iter::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(::std::option::Option::Some(::std::clone::Clone::clone(self)))
}
}
};
}
_ => {}
}
let mut iterable = None;
let wfc = gen.namespace("Windows.Foundation.Collections");
let features = if gen.root.is_empty() {
TokenStream::new()
} else {
quote! { #[cfg(all(feature = "Foundation_Collections"))] }
};
// 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 {
match interface.def.type_name() {
TypeName::IVectorView => {
let constraints = gen_constraints(def);
let item = gen_name(&interface.def.generics[0], gen);
let name = gen_type_name(def, gen);
return quote! {
#features
impl<#constraints> ::std::iter::IntoIterator for #name {
type Item = #item;
type IntoIter = #wfc VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> ::std::iter::IntoIterator for &#name {
type Item = #item;
type IntoIter = #wfc VectorViewIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
#wfc VectorViewIterator::new(::std::convert::TryInto::try_into(self).ok())
}
}
};
}
TypeName::IVector => {
let constraints = gen_constraints(def);
let item = gen_name(&interface.def.generics[0], gen);
let name = gen_type_name(def, gen);
return quote! {
#features
impl<#constraints> ::std::iter::IntoIterator for #name {
type Item = #item;
type IntoIter = #wfc VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> ::std::iter::IntoIterator for &#name {
type Item = #item;
type IntoIter = #wfc VectorIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
#wfc VectorIterator::new(::std::convert::TryInto::try_into(self).ok())
}
}
};
}
TypeName::IIterable => {
iterable = Some(interface);
}
_ => {}
}
}
match iterable {
None => TokenStream::new(),
Some(interface) => {
let constraints = gen_constraints(def);
let item = gen_name(&interface.def.generics[0], gen);
let name = gen_type_name(def, gen);
quote! {
#features
impl<#constraints> ::std::iter::IntoIterator for #name {
type Item = #item;
type IntoIter = #wfc IIterator<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
::std::iter::IntoIterator::into_iter(&self)
}
}
#features
impl<#constraints> ::std::iter::IntoIterator for &#name {
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()
}
}
}
}
}
}