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Support arbitrary containers by IntoIterator blanket impl #230

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Support arbitrary containers by IntoIterator blanket impl #230

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76 changes: 14 additions & 62 deletions src/runtime.rs
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Expand Up @@ -45,11 +45,8 @@ impl BitOr<HasIterator> for HasIterator {
/// whichever impl happens to be applicable. Calling that method repeatedly on
/// the returned value should be idempotent.
pub mod ext {
use super::RepInterp;
use super::{HasIterator as HasIter, ThereIsNoIteratorInRepetition as DoesNotHaveIter};
use crate::ToTokens;
use core::slice;
use std::collections::btree_set::{self, BTreeSet};

/// Extension trait providing the `quote_into_iter` method on iterators.
pub trait RepIteratorExt: Iterator + Sized {
Expand All @@ -60,6 +57,16 @@ pub mod ext {

impl<T: Iterator> RepIteratorExt for T {}

/// Extension trait providing the `quote_into_iter` method on containers
/// implementing IntoIterator.
pub trait RepIntoIteratorExt: IntoIterator + Copy + Sized {
fn quote_into_iter(self) -> (Self::IntoIter, HasIter) {
(self.into_iter(), HasIter)
}
}

impl<T: IntoIterator + Copy> RepIntoIteratorExt for T {}

/// Extension trait providing the `quote_into_iter` method for
/// non-iterable types. These types interpolate the same value in each
/// iteration of the repetition.
Expand All @@ -77,62 +84,6 @@ pub mod ext {
}

impl<T: ToTokens + ?Sized> RepToTokensExt for T {}

/// Extension trait providing the `quote_into_iter` method for types that
/// can be referenced as an iterator.
pub trait RepAsIteratorExt<'q> {
type Iter: Iterator;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter);
}

impl<'q, 'a, T: RepAsIteratorExt<'q> + ?Sized> RepAsIteratorExt<'q> for &'a T {
type Iter = T::Iter;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
<T as RepAsIteratorExt>::quote_into_iter(*self)
}
}

impl<'q, 'a, T: RepAsIteratorExt<'q> + ?Sized> RepAsIteratorExt<'q> for &'a mut T {
type Iter = T::Iter;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
<T as RepAsIteratorExt>::quote_into_iter(*self)
}
}

impl<'q, T: 'q> RepAsIteratorExt<'q> for [T] {
type Iter = slice::Iter<'q, T>;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
(self.iter(), HasIter)
}
}

impl<'q, T: 'q> RepAsIteratorExt<'q> for Vec<T> {
type Iter = slice::Iter<'q, T>;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
(self.iter(), HasIter)
}
}

impl<'q, T: 'q> RepAsIteratorExt<'q> for BTreeSet<T> {
type Iter = btree_set::Iter<'q, T>;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
(self.iter(), HasIter)
}
}

impl<'q, T: RepAsIteratorExt<'q>> RepAsIteratorExt<'q> for RepInterp<T> {
type Iter = T::Iter;

fn quote_into_iter(&'q self) -> (Self::Iter, HasIter) {
self.0.quote_into_iter()
}
}
}

// Helper type used within interpolations to allow for repeated binding names.
Expand All @@ -150,11 +101,12 @@ impl<T> RepInterp<T> {
}
}

impl<T: Iterator> Iterator for RepInterp<T> {
impl<T: IntoIterator> IntoIterator for RepInterp<T> {
type Item = T::Item;
type IntoIter = T::IntoIter;

fn next(&mut self) -> Option<Self::Item> {
self.0.next()
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}

Expand Down
86 changes: 54 additions & 32 deletions tests/ui/not-repeatable.stderr
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@@ -1,35 +1,57 @@
error[E0599]: the method `quote_into_iter` exists for struct `Ipv4Addr`, but its trait bounds were not satisfied
--> tests/ui/not-repeatable.rs:7:9
|
3 | struct Ipv4Addr;
| ---------------
| |
| method `quote_into_iter` not found for this struct
| doesn't satisfy `Ipv4Addr: Iterator`
| doesn't satisfy `Ipv4Addr: ToTokens`
| doesn't satisfy `Ipv4Addr: ext::RepIteratorExt`
| doesn't satisfy `Ipv4Addr: ext::RepToTokensExt`
--> tests/ui/not-repeatable.rs:7:9
|
3 | struct Ipv4Addr;
| ---------------
| |
| method `quote_into_iter` not found for this struct
| doesn't satisfy `Ipv4Addr: Copy`
| doesn't satisfy `Ipv4Addr: IntoIterator`
| doesn't satisfy `Ipv4Addr: Iterator`
| doesn't satisfy `Ipv4Addr: ToTokens`
| doesn't satisfy `Ipv4Addr: ext::RepIntoIteratorExt`
| doesn't satisfy `Ipv4Addr: ext::RepIteratorExt`
| doesn't satisfy `Ipv4Addr: ext::RepToTokensExt`
...
7 | _ = quote! { #(#ip)* };
| ^^^^^^^^^^^^^^^^^^ method cannot be called on `Ipv4Addr` due to unsatisfied trait bounds
|
= note: the following trait bounds were not satisfied:
`Ipv4Addr: Iterator`
which is required by `Ipv4Addr: ext::RepIteratorExt`
`&Ipv4Addr: Iterator`
which is required by `&Ipv4Addr: ext::RepIteratorExt`
`Ipv4Addr: ToTokens`
which is required by `Ipv4Addr: ext::RepToTokensExt`
`&mut Ipv4Addr: Iterator`
which is required by `&mut Ipv4Addr: ext::RepIteratorExt`
7 | _ = quote! { #(#ip)* };
| ^^^^^^^^^^^^^^^^^^ method cannot be called on `Ipv4Addr` due to unsatisfied trait bounds
|
= note: the following trait bounds were not satisfied:
`Ipv4Addr: Iterator`
which is required by `Ipv4Addr: ext::RepIteratorExt`
`Ipv4Addr: IntoIterator`
which is required by `Ipv4Addr: ext::RepIntoIteratorExt`
`Ipv4Addr: Copy`
which is required by `Ipv4Addr: ext::RepIntoIteratorExt`
`&Ipv4Addr: Iterator`
which is required by `&Ipv4Addr: ext::RepIteratorExt`
`&Ipv4Addr: IntoIterator`
which is required by `&Ipv4Addr: ext::RepIntoIteratorExt`
`Ipv4Addr: ToTokens`
which is required by `Ipv4Addr: ext::RepToTokensExt`
`&mut Ipv4Addr: Iterator`
which is required by `&mut Ipv4Addr: ext::RepIteratorExt`
`&mut Ipv4Addr: IntoIterator`
which is required by `&mut Ipv4Addr: ext::RepIntoIteratorExt`
`&mut Ipv4Addr: Copy`
which is required by `&mut Ipv4Addr: ext::RepIntoIteratorExt`
note: the following traits must be implemented
--> src/to_tokens.rs
|
| pub trait ToTokens {
| ^^^^^^^^^^^^^^^^^^
|
::: $RUST/core/src/iter/traits/iterator.rs
|
| pub trait Iterator {
| ^^^^^^^^^^^^^^^^^^
= note: this error originates in the macro `$crate::quote_bind_into_iter` which comes from the expansion of the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)
--> src/to_tokens.rs
|
| pub trait ToTokens {
| ^^^^^^^^^^^^^^^^^^
|
::: $RUST/core/src/iter/traits/collect.rs
|
| pub trait IntoIterator {
| ^^^^^^^^^^^^^^^^^^^^^^
|
::: $RUST/core/src/iter/traits/iterator.rs
|
| pub trait Iterator {
| ^^^^^^^^^^^^^^^^^^
= note: this error originates in the macro `$crate::quote_bind_into_iter` which comes from the expansion of the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Ipv4Addr` with `#[derive(Clone, Copy)]`
|
3 | #[derive(Clone, Copy)]
|