summaryrefslogtreecommitdiffstats
path: root/third_party/rust/arrayvec
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /third_party/rust/arrayvec
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/arrayvec')
-rw-r--r--third_party/rust/arrayvec/.cargo-checksum.json1
-rw-r--r--third_party/rust/arrayvec/CHANGELOG.md301
-rw-r--r--third_party/rust/arrayvec/Cargo.toml59
-rw-r--r--third_party/rust/arrayvec/LICENSE-APACHE201
-rw-r--r--third_party/rust/arrayvec/LICENSE-MIT25
-rw-r--r--third_party/rust/arrayvec/README.md27
-rw-r--r--third_party/rust/arrayvec/benches/arraystring.rs90
-rw-r--r--third_party/rust/arrayvec/benches/extend.rs78
-rwxr-xr-xthird_party/rust/arrayvec/ci/miri.sh15
-rw-r--r--third_party/rust/arrayvec/src/array_string.rs640
-rw-r--r--third_party/rust/arrayvec/src/arrayvec.rs1267
-rw-r--r--third_party/rust/arrayvec/src/arrayvec_impl.rs86
-rw-r--r--third_party/rust/arrayvec/src/char.rs92
-rw-r--r--third_party/rust/arrayvec/src/errors.rs49
-rw-r--r--third_party/rust/arrayvec/src/lib.rs59
-rw-r--r--third_party/rust/arrayvec/src/utils.rs11
-rw-r--r--third_party/rust/arrayvec/tests/serde.rs79
-rw-r--r--third_party/rust/arrayvec/tests/tests.rs793
18 files changed, 3873 insertions, 0 deletions
diff --git a/third_party/rust/arrayvec/.cargo-checksum.json b/third_party/rust/arrayvec/.cargo-checksum.json
new file mode 100644
index 0000000000..d0de9348ca
--- /dev/null
+++ b/third_party/rust/arrayvec/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CHANGELOG.md":"f684ba712e1546b4cc7de9637f484598cd3fa49b7e7b32c2d98562a8f78ce98c","Cargo.toml":"94a588809d4be252f0146b9e193abc1b22d8afcce0265af19f12905a3db37998","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"0245ee104228a100ce5fceecf43e25faae450494d9173f43fd94c27d69fdac13","README.md":"2264c34c62ea4c617d72047b00749b4786dfb9dff2fac24e0320170ee0cd19c8","benches/arraystring.rs":"fad1cecef71c290375befc77c75a868988b8d74135e8f8732bc5b58c85a8ab46","benches/extend.rs":"c38ecedbc88217a7e9fe1a73f916b168a96e48010a7ccd3dba5c3f8dea030d5d","ci/miri.sh":"6bad1d135e1bdd67a6b91c870a7cf5ee09a85f9515633592a6abfbba95fdaf52","src/array_string.rs":"4f0c2dab882e6df7d10a0b043220587626e64ff94dd53a80949667ed861490de","src/arrayvec.rs":"61fba79217f564e54761c25651c06ec3f6d23b9c6af4bfd621992ef2bb95a74b","src/arrayvec_impl.rs":"a5e3391dc350041651f0ba3816c863ff7f552ff553e4a88f801481dfad7e7613","src/char.rs":"1de50e1d6045af2b3496426492315ba774986f9bc8301ffa391de861a08cc9cb","src/errors.rs":"7fa2ff2350f811d52a210a7346c526d6715cacefd38a46e2d3b57ab7dc62b1ab","src/lib.rs":"29a4123616c0912ccae5d931d45f0ccc3746647da1ba077c34538824910dd0ca","src/utils.rs":"d1cdc508dfca385e63f1f57bc8b53ed4a7f515e4ac1ebaa97b1d543fc8369432","tests/serde.rs":"117eb2961b5954d13c577edf60bbb07cb7481685cc9d6c49760a981d71465849","tests/tests.rs":"f8a18ff5deadb167832964ca0fff4f280129dd4a1de024e9cc76ffb7efe1c12c"},"package":"8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"} \ No newline at end of file
diff --git a/third_party/rust/arrayvec/CHANGELOG.md b/third_party/rust/arrayvec/CHANGELOG.md
new file mode 100644
index 0000000000..903ef582f7
--- /dev/null
+++ b/third_party/rust/arrayvec/CHANGELOG.md
@@ -0,0 +1,301 @@
+Recent Changes (arrayvec)
+=========================
+
+## 0.7.2
+
+- Add `.as_mut_str()` to `ArrayString` by @clarfonthey
+- Add `remaining_capacity` to `ArrayString` by @bhgomes
+- Add `zero_filled` constructor by @c410-f3r
+- Optimize `retain` by @TennyZhuang and @niklasf
+- Make the following methods `const` by @bhgomes:
+ - len
+ - is_empty
+ - capacity
+ - is_full
+ - remaining_capacity
+ - CapacityError::new
+
+## 0.7.1
+
+- Add new ArrayVec methods `.take()` and `.into_inner_unchecked()` by @conradludgate
+- `clone_from` now uses `truncate` when needed by @a1phyr
+
+## 0.7.0
+
+- `fn new_const` is now the way to const-construct arrayvec and arraystring,
+ and `fn new` has been reverted to a regular "non-const" function.
+ This works around performance issue #182, where the const fn version did not
+ optimize well. Change by @bluss with thanks to @rodrimati1992 and @niklasf
+ for analyzing the problem.
+
+- The deprecated feature flag `unstable-const-fn` was removed, since it's not needed
+
+- Optimize `.retain()` by using the same algorithm as in std, change by @niklasf,
+ issue #174. Original optimization in Rust std by @oxalica in rust-lang/rust/pull/81126
+
+## 0.6.1
+
+- The ``ArrayVec::new`` and ``ArrayString::new`` constructors are properly
+ const fns on stable and the feature flag ``unstable-const-fn`` is now deprecated.
+ by @rodrimati1992
+
+- Small fix to the capacity check macro by @Xaeroxe
+- Typo fix in documentation by @cuviper
+- Small code cleanup by @bluss
+
+## 0.6.0
+
+- The **const generics** release 🎉. Arrayvec finally implements what it
+ wanted to implement, since its first version: a vector backed by an array,
+ with generic parameters for the arbitrary element type *and* backing array
+ capacity.
+
+ The New type syntax is `ArrayVec<T, CAP>` where `CAP` is the arrayvec capacity.
+ For arraystring the syntax is `ArrayString<CAP>`.
+
+ Length is stored internally as u32; this limits the maximum capacity. The size
+ of the `ArrayVec` or `ArrayString` structs for the same capacity may grow
+ slightly compared with the previous version (depending on padding requirements
+ for the element type). Change by @bluss.
+
+- Arrayvec's `.extend()` and `FromIterator`/`.collect()` to arrayvec now
+ **panic** if the capacity of the arrayvec is exceeded. Change by @bluss.
+
+- Arraystring now implements `TryFrom<&str>` and `TryFrom<fmt::Arguments>` by
+ @c410-f3r
+
+- Minimum supported rust version is Rust 1.51
+
+## 0.5.2
+
+- Add `is_empty` methods for ArrayVec and ArrayString by @nicbn
+- Implement `TryFrom<Slice>` for ArrayVec by @paulkernfeld
+- Add `unstable-const-fn` to make `new` methods const by @m-ou-se
+- Run miri in CI and a few related fixes by @RalfJung
+- Fix outdated comment by @Phlosioneer
+- Move changelog to a separate file by @Luro02
+- Remove deprecated `Error::description` by @AnderEnder
+- Use pointer method `add` by @hbina
+
+## 0.5.1
+
+- Add `as_ptr`, `as_mut_ptr` accessors directly on the `ArrayVec` by @tbu-
+ (matches the same addition to `Vec` which happened in Rust 1.37).
+- Add method `ArrayString::len` (now available directly, not just through deref to str).
+- Use raw pointers instead of `&mut [u8]` for encoding chars into `ArrayString`
+ (uninit best practice fix).
+- Use raw pointers instead of `get_unchecked_mut` where the target may be
+ uninitialized everywhere relevant in the ArrayVec implementation
+ (uninit best practice fix).
+- Changed inline hints on many methods, mainly removing inline hints
+- `ArrayVec::dispose` is now deprecated (it has no purpose anymore)
+
+## 0.4.12
+
+- Use raw pointers instead of `get_unchecked_mut` where the target may be
+ uninitialized everywhere relevant in the ArrayVec implementation.
+
+## 0.5.0
+
+- Use `MaybeUninit` (now unconditionally) in the implementation of
+ `ArrayVec`
+- Use `MaybeUninit` (now unconditionally) in the implementation of
+ `ArrayString`
+- The crate feature for serde serialization is now named `serde`.
+- Updated the `Array` trait interface, and it is now easier to use for
+ users outside the crate.
+- Add `FromStr` impl for `ArrayString` by @despawnerer
+- Add method `try_extend_from_slice` to `ArrayVec`, which is always
+ effecient by @Thomasdezeeuw.
+- Add method `remaining_capacity` by @Thomasdezeeuw
+- Improve performance of the `extend` method.
+- The index type of zero capacity vectors is now itself zero size, by
+ @clarfon
+- Use `drop_in_place` for truncate and clear methods. This affects drop order
+ and resume from panic during drop.
+- Use Rust 2018 edition for the implementation
+- Require Rust 1.36 or later, for the unconditional `MaybeUninit`
+ improvements.
+
+## Older releases
+
+- 0.4.11
+
+ - In Rust 1.36 or later, use newly stable `MaybeUninit`. This extends the
+ soundness work introduced in 0.4.9, we are finally able to use this in
+ stable. We use feature detection (build script) to enable this at build
+ time.
+
+- 0.4.10
+
+ - Use `repr(C)` in the `union` version that was introduced in 0.4.9, to
+ allay some soundness concerns.
+
+- 0.4.9
+
+ - Use `union` in the implementation on when this is detected to be supported
+ (nightly only for now). This is a better solution for treating uninitialized
+ regions correctly, and we'll use it in stable Rust as soon as we are able.
+ When this is enabled, the `ArrayVec` has no space overhead in its memory
+ layout, although the size of the vec should not be relied upon. (See [#114](https://github.com/bluss/arrayvec/pull/114))
+ - `ArrayString` updated to not use uninitialized memory, it instead zeros its
+ backing array. This will be refined in the next version, since we
+ need to make changes to the user visible API.
+ - The `use_union` feature now does nothing (like its documentation foretold).
+
+
+- 0.4.8
+
+ - Implement Clone and Debug for `IntoIter` by @clarcharr
+ - Add more array sizes under crate features. These cover all in the range
+ up to 128 and 129 to 255 respectively (we have a few of those by default):
+
+ - `array-size-33-128`
+ - `array-size-129-255`
+
+- 0.4.7
+
+ - Fix future compat warning about raw pointer casts
+ - Use `drop_in_place` when dropping the arrayvec by-value iterator
+ - Decrease mininum Rust version (see docs) by @jeehoonkang
+
+- 0.3.25
+
+ - Fix future compat warning about raw pointer casts
+
+- 0.4.6
+
+ - Fix compilation on 16-bit targets. This means, the 65536 array size is not
+ included on these targets.
+
+- 0.3.24
+
+ - Fix compilation on 16-bit targets. This means, the 65536 array size is not
+ included on these targets.
+ - Fix license files so that they are both included (was fixed in 0.4 before)
+
+- 0.4.5
+
+ - Add methods to `ArrayString` by @DenialAdams:
+
+ - `.pop() -> Option<char>`
+ - `.truncate(new_len)`
+ - `.remove(index) -> char`
+
+ - Remove dependency on crate odds
+ - Document debug assertions in unsafe methods better
+
+- 0.4.4
+
+ - Add method `ArrayVec::truncate()` by @niklasf
+
+- 0.4.3
+
+ - Improve performance for `ArrayVec::extend` with a lower level
+ implementation (#74)
+ - Small cleanup in dependencies (use no std for crates where we don't need more)
+
+- 0.4.2
+
+ - Add constructor method `new` to `CapacityError`.
+
+- 0.4.1
+
+ - Add `Default` impl to `ArrayString` by @tbu-
+
+- 0.4.0
+
+ - Reformed signatures and error handling by @bluss and @tbu-:
+
+ - `ArrayVec`'s `push, insert, remove, swap_remove` now match `Vec`'s
+ corresponding signature and panic on capacity errors where applicable.
+ - Add fallible methods `try_push, insert` and checked methods
+ `pop_at, swap_pop`.
+ - Similar changes to `ArrayString`'s push methods.
+
+ - Use a local version of the `RangeArgument` trait
+ - Add array sizes 50, 150, 200 by @daboross
+ - Support serde 1.0 by @daboross
+ - New method `.push_unchecked()` by @niklasf
+ - `ArrayString` implements `PartialOrd, Ord` by @tbu-
+ - Require Rust 1.14
+ - crate feature `use_generic_array` was dropped.
+
+- 0.3.23
+
+ - Implement `PartialOrd, Ord` as well as `PartialOrd<str>` for
+ `ArrayString`.
+
+- 0.3.22
+
+ - Implement `Array` for the 65536 size
+
+- 0.3.21
+
+ - Use `encode_utf8` from crate odds
+ - Add constructor `ArrayString::from_byte_string`
+
+- 0.3.20
+
+ - Simplify and speed up `ArrayString`’s `.push(char)`-
+
+- 0.3.19
+
+ - Add new crate feature `use_generic_array` which allows using their
+ `GenericArray` just like a regular fixed size array for the storage
+ of an `ArrayVec`.
+
+- 0.3.18
+
+ - Fix bounds check in `ArrayVec::insert`!
+ It would be buggy if `self.len() < index < self.capacity()`. Take note of
+ the push out behavior specified in the docs.
+
+- 0.3.17
+
+ - Added crate feature `use_union` which forwards to the nodrop crate feature
+ - Added methods `.is_full()` to `ArrayVec` and `ArrayString`.
+
+- 0.3.16
+
+ - Added method `.retain()` to `ArrayVec`.
+ - Added methods `.as_slice(), .as_mut_slice()` to `ArrayVec` and `.as_str()`
+ to `ArrayString`.
+
+- 0.3.15
+
+ - Add feature std, which you can opt out of to use `no_std` (requires Rust 1.6
+ to opt out).
+ - Implement `Clone::clone_from` for ArrayVec and ArrayString
+
+- 0.3.14
+
+ - Add `ArrayString::from(&str)`
+
+- 0.3.13
+
+ - Added `DerefMut` impl for `ArrayString`.
+ - Added method `.simplify()` to drop the element for `CapacityError`.
+ - Added method `.dispose()` to `ArrayVec`
+
+- 0.3.12
+
+ - Added ArrayString, a fixed capacity analogy of String
+
+- 0.3.11
+
+ - Added trait impls Default, PartialOrd, Ord, Write for ArrayVec
+
+- 0.3.10
+
+ - Go back to using external NoDrop, fixing a panic safety bug (issue #3)
+
+- 0.3.8
+
+ - Inline the non-dropping logic to remove one drop flag in the
+ ArrayVec representation.
+
+- 0.3.7
+
+ - Added method .into_inner()
+ - Added unsafe method .set_len()
diff --git a/third_party/rust/arrayvec/Cargo.toml b/third_party/rust/arrayvec/Cargo.toml
new file mode 100644
index 0000000000..54b00740c1
--- /dev/null
+++ b/third_party/rust/arrayvec/Cargo.toml
@@ -0,0 +1,59 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "arrayvec"
+version = "0.7.2"
+authors = ["bluss"]
+description = "A vector with fixed capacity, backed by an array (it can be stored on the stack too). Implements fixed capacity ArrayVec and ArrayString."
+documentation = "https://docs.rs/arrayvec/"
+keywords = ["stack", "vector", "array", "data-structure", "no_std"]
+categories = ["data-structures", "no-std"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/bluss/arrayvec"
+[package.metadata.docs.rs]
+features = ["serde"]
+
+[package.metadata.release]
+no-dev-version = true
+tag-name = "{{version}}"
+[profile.bench]
+debug = true
+
+[profile.release]
+debug = true
+
+[[bench]]
+name = "extend"
+harness = false
+
+[[bench]]
+name = "arraystring"
+harness = false
+[dependencies.serde]
+version = "1.0"
+optional = true
+default-features = false
+[dev-dependencies.bencher]
+version = "0.1.4"
+
+[dev-dependencies.matches]
+version = "0.1"
+
+[dev-dependencies.serde_test]
+version = "1.0"
+
+[build-dependencies]
+
+[features]
+default = ["std"]
+std = []
diff --git a/third_party/rust/arrayvec/LICENSE-APACHE b/third_party/rust/arrayvec/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/third_party/rust/arrayvec/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
+ replaced with your own identifying information. (Don't include
+ the brackets!) The text should be enclosed in the appropriate
+ comment syntax for the file format. We also recommend that a
+ file or class name and description of purpose be included on the
+ same "printed page" as the copyright notice for easier
+ identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/third_party/rust/arrayvec/LICENSE-MIT b/third_party/rust/arrayvec/LICENSE-MIT
new file mode 100644
index 0000000000..2c8f27dba1
--- /dev/null
+++ b/third_party/rust/arrayvec/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) Ulrik Sverdrup "bluss" 2015-2017
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/arrayvec/README.md b/third_party/rust/arrayvec/README.md
new file mode 100644
index 0000000000..85ccbd13bd
--- /dev/null
+++ b/third_party/rust/arrayvec/README.md
@@ -0,0 +1,27 @@
+
+arrayvec
+========
+[![Crates.io: arrayvec](https://img.shields.io/crates/v/arrayvec.svg)](https://crates.io/crates/arrayvec)
+[![Documentation](https://docs.rs/arrayvec/badge.svg)](https://docs.rs/arrayvec)
+[![Build Status](https://github.com/bluss/arrayvec/workflows/Continuous%20integration/badge.svg?branch=master)](https://github.com/bluss/arrayvec/actions)
+
+
+
+
+[![License: Apache](https://img.shields.io/badge/License-Apache%202.0-red.svg)](LICENSE-APACHE)
+OR
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+
+A vector with fixed capacity.
+
+Please read the [`API documentation here`](https://docs.rs/arrayvec)
+
+# License
+
+Dual-licensed to be compatible with the Rust project.
+
+Licensed under the Apache License, Version 2.0
+http://www.apache.org/licenses/LICENSE-2.0 or the MIT license
+http://opensource.org/licenses/MIT, at your
+option. This file may not be copied, modified, or distributed
+except according to those terms.
diff --git a/third_party/rust/arrayvec/benches/arraystring.rs b/third_party/rust/arrayvec/benches/arraystring.rs
new file mode 100644
index 0000000000..5b986fa2ab
--- /dev/null
+++ b/third_party/rust/arrayvec/benches/arraystring.rs
@@ -0,0 +1,90 @@
+
+extern crate arrayvec;
+#[macro_use] extern crate bencher;
+
+use arrayvec::ArrayString;
+
+use bencher::Bencher;
+
+fn try_push_c(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ b.iter(|| {
+ v.clear();
+ while v.try_push('c').is_ok() {
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn try_push_alpha(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ b.iter(|| {
+ v.clear();
+ while v.try_push('α').is_ok() {
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+// Yes, pushing a string char-by-char is slow. Use .push_str.
+fn try_push_string(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ let input = "abcαβγ“”";
+ b.iter(|| {
+ v.clear();
+ for ch in input.chars().cycle() {
+ if !v.try_push(ch).is_ok() {
+ break;
+ }
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn push_c(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ b.iter(|| {
+ v.clear();
+ while !v.is_full() {
+ v.push('c');
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn push_alpha(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ b.iter(|| {
+ v.clear();
+ while !v.is_full() {
+ v.push('α');
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn push_string(b: &mut Bencher) {
+ let mut v = ArrayString::<512>::new();
+ let input = "abcαβγ“”";
+ b.iter(|| {
+ v.clear();
+ for ch in input.chars().cycle() {
+ if !v.is_full() {
+ v.push(ch);
+ } else {
+ break;
+ }
+ }
+ v.len()
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+benchmark_group!(benches, try_push_c, try_push_alpha, try_push_string, push_c,
+ push_alpha, push_string);
+benchmark_main!(benches);
diff --git a/third_party/rust/arrayvec/benches/extend.rs b/third_party/rust/arrayvec/benches/extend.rs
new file mode 100644
index 0000000000..ba33a93257
--- /dev/null
+++ b/third_party/rust/arrayvec/benches/extend.rs
@@ -0,0 +1,78 @@
+
+extern crate arrayvec;
+#[macro_use] extern crate bencher;
+
+use std::io::Write;
+
+use arrayvec::ArrayVec;
+
+use bencher::Bencher;
+use bencher::black_box;
+
+fn extend_with_constant(b: &mut Bencher) {
+ let mut v = ArrayVec::<u8, 512>::new();
+ let cap = v.capacity();
+ b.iter(|| {
+ v.clear();
+ let constant = black_box(1);
+ v.extend((0..cap).map(move |_| constant));
+ v[511]
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_range(b: &mut Bencher) {
+ let mut v = ArrayVec::<u8, 512>::new();
+ let cap = v.capacity();
+ b.iter(|| {
+ v.clear();
+ let range = 0..cap;
+ v.extend(range.map(|x| black_box(x as _)));
+ v[511]
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_slice(b: &mut Bencher) {
+ let mut v = ArrayVec::<u8, 512>::new();
+ let data = [1; 512];
+ b.iter(|| {
+ v.clear();
+ let iter = data.iter().map(|&x| x);
+ v.extend(iter);
+ v[511]
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_write(b: &mut Bencher) {
+ let mut v = ArrayVec::<u8, 512>::new();
+ let data = [1; 512];
+ b.iter(|| {
+ v.clear();
+ v.write(&data[..]).ok();
+ v[511]
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+fn extend_from_slice(b: &mut Bencher) {
+ let mut v = ArrayVec::<u8, 512>::new();
+ let data = [1; 512];
+ b.iter(|| {
+ v.clear();
+ v.try_extend_from_slice(&data).ok();
+ v[511]
+ });
+ b.bytes = v.capacity() as u64;
+}
+
+benchmark_group!(benches,
+ extend_with_constant,
+ extend_with_range,
+ extend_with_slice,
+ extend_with_write,
+ extend_from_slice
+);
+
+benchmark_main!(benches);
diff --git a/third_party/rust/arrayvec/ci/miri.sh b/third_party/rust/arrayvec/ci/miri.sh
new file mode 100755
index 0000000000..272995ca86
--- /dev/null
+++ b/third_party/rust/arrayvec/ci/miri.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -ex
+
+export CARGO_NET_RETRY=5
+export CARGO_NET_TIMEOUT=10
+
+MIRI_NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)
+echo "Installing latest nightly with Miri: $MIRI_NIGHTLY"
+rustup default "$MIRI_NIGHTLY"
+
+rustup component add miri
+cargo miri setup
+
+cargo miri test
diff --git a/third_party/rust/arrayvec/src/array_string.rs b/third_party/rust/arrayvec/src/array_string.rs
new file mode 100644
index 0000000000..c4712a0cbe
--- /dev/null
+++ b/third_party/rust/arrayvec/src/array_string.rs
@@ -0,0 +1,640 @@
+use std::borrow::Borrow;
+use std::cmp;
+use std::convert::TryFrom;
+use std::fmt;
+use std::hash::{Hash, Hasher};
+use std::mem::MaybeUninit;
+use std::ops::{Deref, DerefMut};
+use std::ptr;
+use std::slice;
+use std::str;
+use std::str::FromStr;
+use std::str::Utf8Error;
+
+use crate::CapacityError;
+use crate::LenUint;
+use crate::char::encode_utf8;
+use crate::utils::MakeMaybeUninit;
+
+#[cfg(feature="serde")]
+use serde::{Serialize, Deserialize, Serializer, Deserializer};
+
+
+/// A string with a fixed capacity.
+///
+/// The `ArrayString` is a string backed by a fixed size array. It keeps track
+/// of its length, and is parameterized by `CAP` for the maximum capacity.
+///
+/// `CAP` is of type `usize` but is range limited to `u32::MAX`; attempting to create larger
+/// arrayvecs with larger capacity will panic.
+///
+/// The string is a contiguous value that you can store directly on the stack
+/// if needed.
+#[derive(Copy)]
+pub struct ArrayString<const CAP: usize> {
+ // the `len` first elements of the array are initialized
+ xs: [MaybeUninit<u8>; CAP],
+ len: LenUint,
+}
+
+impl<const CAP: usize> Default for ArrayString<CAP>
+{
+ /// Return an empty `ArrayString`
+ fn default() -> ArrayString<CAP> {
+ ArrayString::new()
+ }
+}
+
+impl<const CAP: usize> ArrayString<CAP>
+{
+ /// Create a new empty `ArrayString`.
+ ///
+ /// Capacity is inferred from the type parameter.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<16>::new();
+ /// string.push_str("foo");
+ /// assert_eq!(&string[..], "foo");
+ /// assert_eq!(string.capacity(), 16);
+ /// ```
+ pub fn new() -> ArrayString<CAP> {
+ assert_capacity_limit!(CAP);
+ unsafe {
+ ArrayString { xs: MaybeUninit::uninit().assume_init(), len: 0 }
+ }
+ }
+
+ /// Create a new empty `ArrayString` (const fn).
+ ///
+ /// Capacity is inferred from the type parameter.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// static ARRAY: ArrayString<1024> = ArrayString::new_const();
+ /// ```
+ pub const fn new_const() -> ArrayString<CAP> {
+ assert_capacity_limit_const!(CAP);
+ ArrayString { xs: MakeMaybeUninit::ARRAY, len: 0 }
+ }
+
+ /// Return the length of the string.
+ #[inline]
+ pub const fn len(&self) -> usize { self.len as usize }
+
+ /// Returns whether the string is empty.
+ #[inline]
+ pub const fn is_empty(&self) -> bool { self.len() == 0 }
+
+ /// Create a new `ArrayString` from a `str`.
+ ///
+ /// Capacity is inferred from the type parameter.
+ ///
+ /// **Errors** if the backing array is not large enough to fit the string.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<3>::from("foo").unwrap();
+ /// assert_eq!(&string[..], "foo");
+ /// assert_eq!(string.len(), 3);
+ /// assert_eq!(string.capacity(), 3);
+ /// ```
+ pub fn from(s: &str) -> Result<Self, CapacityError<&str>> {
+ let mut arraystr = Self::new();
+ arraystr.try_push_str(s)?;
+ Ok(arraystr)
+ }
+
+ /// Create a new `ArrayString` from a byte string literal.
+ ///
+ /// **Errors** if the byte string literal is not valid UTF-8.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let string = ArrayString::from_byte_string(b"hello world").unwrap();
+ /// ```
+ pub fn from_byte_string(b: &[u8; CAP]) -> Result<Self, Utf8Error> {
+ let len = str::from_utf8(b)?.len();
+ debug_assert_eq!(len, CAP);
+ let mut vec = Self::new();
+ unsafe {
+ (b as *const [u8; CAP] as *const [MaybeUninit<u8>; CAP])
+ .copy_to_nonoverlapping(&mut vec.xs as *mut [MaybeUninit<u8>; CAP], 1);
+ vec.set_len(CAP);
+ }
+ Ok(vec)
+ }
+
+ /// Create a new `ArrayString` value fully filled with ASCII NULL characters (`\0`). Useful
+ /// to be used as a buffer to collect external data or as a buffer for intermediate processing.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let string = ArrayString::<16>::zero_filled();
+ /// assert_eq!(string.len(), 16);
+ /// ```
+ #[inline]
+ pub fn zero_filled() -> Self {
+ assert_capacity_limit!(CAP);
+ // SAFETY: `assert_capacity_limit` asserts that `len` won't overflow and
+ // `zeroed` fully fills the array with nulls.
+ unsafe {
+ ArrayString {
+ xs: MaybeUninit::zeroed().assume_init(),
+ len: CAP as _
+ }
+ }
+ }
+
+ /// Return the capacity of the `ArrayString`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let string = ArrayString::<3>::new();
+ /// assert_eq!(string.capacity(), 3);
+ /// ```
+ #[inline(always)]
+ pub const fn capacity(&self) -> usize { CAP }
+
+ /// Return if the `ArrayString` is completely filled.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<1>::new();
+ /// assert!(!string.is_full());
+ /// string.push_str("A");
+ /// assert!(string.is_full());
+ /// ```
+ pub const fn is_full(&self) -> bool { self.len() == self.capacity() }
+
+ /// Returns the capacity left in the `ArrayString`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<3>::from("abc").unwrap();
+ /// string.pop();
+ /// assert_eq!(string.remaining_capacity(), 1);
+ /// ```
+ pub const fn remaining_capacity(&self) -> usize {
+ self.capacity() - self.len()
+ }
+
+ /// Adds the given char to the end of the string.
+ ///
+ /// ***Panics*** if the backing array is not large enough to fit the additional char.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<2>::new();
+ ///
+ /// string.push('a');
+ /// string.push('b');
+ ///
+ /// assert_eq!(&string[..], "ab");
+ /// ```
+ pub fn push(&mut self, c: char) {
+ self.try_push(c).unwrap();
+ }
+
+ /// Adds the given char to the end of the string.
+ ///
+ /// Returns `Ok` if the push succeeds.
+ ///
+ /// **Errors** if the backing array is not large enough to fit the additional char.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<2>::new();
+ ///
+ /// string.try_push('a').unwrap();
+ /// string.try_push('b').unwrap();
+ /// let overflow = string.try_push('c');
+ ///
+ /// assert_eq!(&string[..], "ab");
+ /// assert_eq!(overflow.unwrap_err().element(), 'c');
+ /// ```
+ pub fn try_push(&mut self, c: char) -> Result<(), CapacityError<char>> {
+ let len = self.len();
+ unsafe {
+ let ptr = self.as_mut_ptr().add(len);
+ let remaining_cap = self.capacity() - len;
+ match encode_utf8(c, ptr, remaining_cap) {
+ Ok(n) => {
+ self.set_len(len + n);
+ Ok(())
+ }
+ Err(_) => Err(CapacityError::new(c)),
+ }
+ }
+ }
+
+ /// Adds the given string slice to the end of the string.
+ ///
+ /// ***Panics*** if the backing array is not large enough to fit the string.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<2>::new();
+ ///
+ /// string.push_str("a");
+ /// string.push_str("d");
+ ///
+ /// assert_eq!(&string[..], "ad");
+ /// ```
+ pub fn push_str(&mut self, s: &str) {
+ self.try_push_str(s).unwrap()
+ }
+
+ /// Adds the given string slice to the end of the string.
+ ///
+ /// Returns `Ok` if the push succeeds.
+ ///
+ /// **Errors** if the backing array is not large enough to fit the string.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<2>::new();
+ ///
+ /// string.try_push_str("a").unwrap();
+ /// let overflow1 = string.try_push_str("bc");
+ /// string.try_push_str("d").unwrap();
+ /// let overflow2 = string.try_push_str("ef");
+ ///
+ /// assert_eq!(&string[..], "ad");
+ /// assert_eq!(overflow1.unwrap_err().element(), "bc");
+ /// assert_eq!(overflow2.unwrap_err().element(), "ef");
+ /// ```
+ pub fn try_push_str<'a>(&mut self, s: &'a str) -> Result<(), CapacityError<&'a str>> {
+ if s.len() > self.capacity() - self.len() {
+ return Err(CapacityError::new(s));
+ }
+ unsafe {
+ let dst = self.as_mut_ptr().add(self.len());
+ let src = s.as_ptr();
+ ptr::copy_nonoverlapping(src, dst, s.len());
+ let newl = self.len() + s.len();
+ self.set_len(newl);
+ }
+ Ok(())
+ }
+
+ /// Removes the last character from the string and returns it.
+ ///
+ /// Returns `None` if this `ArrayString` is empty.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut s = ArrayString::<3>::from("foo").unwrap();
+ ///
+ /// assert_eq!(s.pop(), Some('o'));
+ /// assert_eq!(s.pop(), Some('o'));
+ /// assert_eq!(s.pop(), Some('f'));
+ ///
+ /// assert_eq!(s.pop(), None);
+ /// ```
+ pub fn pop(&mut self) -> Option<char> {
+ let ch = match self.chars().rev().next() {
+ Some(ch) => ch,
+ None => return None,
+ };
+ let new_len = self.len() - ch.len_utf8();
+ unsafe {
+ self.set_len(new_len);
+ }
+ Some(ch)
+ }
+
+ /// Shortens this `ArrayString` to the specified length.
+ ///
+ /// If `new_len` is greater than the string’s current length, this has no
+ /// effect.
+ ///
+ /// ***Panics*** if `new_len` does not lie on a `char` boundary.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut string = ArrayString::<6>::from("foobar").unwrap();
+ /// string.truncate(3);
+ /// assert_eq!(&string[..], "foo");
+ /// string.truncate(4);
+ /// assert_eq!(&string[..], "foo");
+ /// ```
+ pub fn truncate(&mut self, new_len: usize) {
+ if new_len <= self.len() {
+ assert!(self.is_char_boundary(new_len));
+ unsafe {
+ // In libstd truncate is called on the underlying vector,
+ // which in turns drops each element.
+ // As we know we don't have to worry about Drop,
+ // we can just set the length (a la clear.)
+ self.set_len(new_len);
+ }
+ }
+ }
+
+ /// Removes a `char` from this `ArrayString` at a byte position and returns it.
+ ///
+ /// This is an `O(n)` operation, as it requires copying every element in the
+ /// array.
+ ///
+ /// ***Panics*** if `idx` is larger than or equal to the `ArrayString`’s length,
+ /// or if it does not lie on a `char` boundary.
+ ///
+ /// ```
+ /// use arrayvec::ArrayString;
+ ///
+ /// let mut s = ArrayString::<3>::from("foo").unwrap();
+ ///
+ /// assert_eq!(s.remove(0), 'f');
+ /// assert_eq!(s.remove(1), 'o');
+ /// assert_eq!(s.remove(0), 'o');
+ /// ```
+ pub fn remove(&mut self, idx: usize) -> char {
+ let ch = match self[idx..].chars().next() {
+ Some(ch) => ch,
+ None => panic!("cannot remove a char from the end of a string"),
+ };
+
+ let next = idx + ch.len_utf8();
+ let len = self.len();
+ unsafe {
+ ptr::copy(self.as_ptr().add(next),
+ self.as_mut_ptr().add(idx),
+ len - next);
+ self.set_len(len - (next - idx));
+ }
+ ch
+ }
+
+ /// Make the string empty.
+ pub fn clear(&mut self) {
+ unsafe {
+ self.set_len(0);
+ }
+ }
+
+ /// Set the strings’s length.
+ ///
+ /// This function is `unsafe` because it changes the notion of the
+ /// number of “valid” bytes in the string. Use with care.
+ ///
+ /// This method uses *debug assertions* to check the validity of `length`
+ /// and may use other debug assertions.
+ pub unsafe fn set_len(&mut self, length: usize) {
+ // type invariant that capacity always fits in LenUint
+ debug_assert!(length <= self.capacity());
+ self.len = length as LenUint;
+ }
+
+ /// Return a string slice of the whole `ArrayString`.
+ pub fn as_str(&self) -> &str {
+ self
+ }
+
+ /// Return a mutable string slice of the whole `ArrayString`.
+ pub fn as_mut_str(&mut self) -> &mut str {
+ self
+ }
+
+ fn as_ptr(&self) -> *const u8 {
+ self.xs.as_ptr() as *const u8
+ }
+
+ fn as_mut_ptr(&mut self) -> *mut u8 {
+ self.xs.as_mut_ptr() as *mut u8
+ }
+}
+
+impl<const CAP: usize> Deref for ArrayString<CAP>
+{
+ type Target = str;
+ #[inline]
+ fn deref(&self) -> &str {
+ unsafe {
+ let sl = slice::from_raw_parts(self.as_ptr(), self.len());
+ str::from_utf8_unchecked(sl)
+ }
+ }
+}
+
+impl<const CAP: usize> DerefMut for ArrayString<CAP>
+{
+ #[inline]
+ fn deref_mut(&mut self) -> &mut str {
+ unsafe {
+ let len = self.len();
+ let sl = slice::from_raw_parts_mut(self.as_mut_ptr(), len);
+ str::from_utf8_unchecked_mut(sl)
+ }
+ }
+}
+
+impl<const CAP: usize> PartialEq for ArrayString<CAP>
+{
+ fn eq(&self, rhs: &Self) -> bool {
+ **self == **rhs
+ }
+}
+
+impl<const CAP: usize> PartialEq<str> for ArrayString<CAP>
+{
+ fn eq(&self, rhs: &str) -> bool {
+ &**self == rhs
+ }
+}
+
+impl<const CAP: usize> PartialEq<ArrayString<CAP>> for str
+{
+ fn eq(&self, rhs: &ArrayString<CAP>) -> bool {
+ self == &**rhs
+ }
+}
+
+impl<const CAP: usize> Eq for ArrayString<CAP>
+{ }
+
+impl<const CAP: usize> Hash for ArrayString<CAP>
+{
+ fn hash<H: Hasher>(&self, h: &mut H) {
+ (**self).hash(h)
+ }
+}
+
+impl<const CAP: usize> Borrow<str> for ArrayString<CAP>
+{
+ fn borrow(&self) -> &str { self }
+}
+
+impl<const CAP: usize> AsRef<str> for ArrayString<CAP>
+{
+ fn as_ref(&self) -> &str { self }
+}
+
+impl<const CAP: usize> fmt::Debug for ArrayString<CAP>
+{
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+impl<const CAP: usize> fmt::Display for ArrayString<CAP>
+{
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+/// `Write` appends written data to the end of the string.
+impl<const CAP: usize> fmt::Write for ArrayString<CAP>
+{
+ fn write_char(&mut self, c: char) -> fmt::Result {
+ self.try_push(c).map_err(|_| fmt::Error)
+ }
+
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ self.try_push_str(s).map_err(|_| fmt::Error)
+ }
+}
+
+impl<const CAP: usize> Clone for ArrayString<CAP>
+{
+ fn clone(&self) -> ArrayString<CAP> {
+ *self
+ }
+ fn clone_from(&mut self, rhs: &Self) {
+ // guaranteed to fit due to types matching.
+ self.clear();
+ self.try_push_str(rhs).ok();
+ }
+}
+
+impl<const CAP: usize> PartialOrd for ArrayString<CAP>
+{
+ fn partial_cmp(&self, rhs: &Self) -> Option<cmp::Ordering> {
+ (**self).partial_cmp(&**rhs)
+ }
+ fn lt(&self, rhs: &Self) -> bool { **self < **rhs }
+ fn le(&self, rhs: &Self) -> bool { **self <= **rhs }
+ fn gt(&self, rhs: &Self) -> bool { **self > **rhs }
+ fn ge(&self, rhs: &Self) -> bool { **self >= **rhs }
+}
+
+impl<const CAP: usize> PartialOrd<str> for ArrayString<CAP>
+{
+ fn partial_cmp(&self, rhs: &str) -> Option<cmp::Ordering> {
+ (**self).partial_cmp(rhs)
+ }
+ fn lt(&self, rhs: &str) -> bool { &**self < rhs }
+ fn le(&self, rhs: &str) -> bool { &**self <= rhs }
+ fn gt(&self, rhs: &str) -> bool { &**self > rhs }
+ fn ge(&self, rhs: &str) -> bool { &**self >= rhs }
+}
+
+impl<const CAP: usize> PartialOrd<ArrayString<CAP>> for str
+{
+ fn partial_cmp(&self, rhs: &ArrayString<CAP>) -> Option<cmp::Ordering> {
+ self.partial_cmp(&**rhs)
+ }
+ fn lt(&self, rhs: &ArrayString<CAP>) -> bool { self < &**rhs }
+ fn le(&self, rhs: &ArrayString<CAP>) -> bool { self <= &**rhs }
+ fn gt(&self, rhs: &ArrayString<CAP>) -> bool { self > &**rhs }
+ fn ge(&self, rhs: &ArrayString<CAP>) -> bool { self >= &**rhs }
+}
+
+impl<const CAP: usize> Ord for ArrayString<CAP>
+{
+ fn cmp(&self, rhs: &Self) -> cmp::Ordering {
+ (**self).cmp(&**rhs)
+ }
+}
+
+impl<const CAP: usize> FromStr for ArrayString<CAP>
+{
+ type Err = CapacityError;
+
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ Self::from(s).map_err(CapacityError::simplify)
+ }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<const CAP: usize> Serialize for ArrayString<CAP>
+{
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where S: Serializer
+ {
+ serializer.serialize_str(&*self)
+ }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<'de, const CAP: usize> Deserialize<'de> for ArrayString<CAP>
+{
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+ where D: Deserializer<'de>
+ {
+ use serde::de::{self, Visitor};
+ use std::marker::PhantomData;
+
+ struct ArrayStringVisitor<const CAP: usize>(PhantomData<[u8; CAP]>);
+
+ impl<'de, const CAP: usize> Visitor<'de> for ArrayStringVisitor<CAP> {
+ type Value = ArrayString<CAP>;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ write!(formatter, "a string no more than {} bytes long", CAP)
+ }
+
+ fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+ where E: de::Error,
+ {
+ ArrayString::from(v).map_err(|_| E::invalid_length(v.len(), &self))
+ }
+
+ fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+ where E: de::Error,
+ {
+ let s = str::from_utf8(v).map_err(|_| E::invalid_value(de::Unexpected::Bytes(v), &self))?;
+
+ ArrayString::from(s).map_err(|_| E::invalid_length(s.len(), &self))
+ }
+ }
+
+ deserializer.deserialize_str(ArrayStringVisitor(PhantomData))
+ }
+}
+
+impl<'a, const CAP: usize> TryFrom<&'a str> for ArrayString<CAP>
+{
+ type Error = CapacityError<&'a str>;
+
+ fn try_from(f: &'a str) -> Result<Self, Self::Error> {
+ let mut v = Self::new();
+ v.try_push_str(f)?;
+ Ok(v)
+ }
+}
+
+impl<'a, const CAP: usize> TryFrom<fmt::Arguments<'a>> for ArrayString<CAP>
+{
+ type Error = CapacityError<fmt::Error>;
+
+ fn try_from(f: fmt::Arguments<'a>) -> Result<Self, Self::Error> {
+ use fmt::Write;
+ let mut v = Self::new();
+ v.write_fmt(f).map_err(|e| CapacityError::new(e))?;
+ Ok(v)
+ }
+}
diff --git a/third_party/rust/arrayvec/src/arrayvec.rs b/third_party/rust/arrayvec/src/arrayvec.rs
new file mode 100644
index 0000000000..e69e60c180
--- /dev/null
+++ b/third_party/rust/arrayvec/src/arrayvec.rs
@@ -0,0 +1,1267 @@
+
+use std::cmp;
+use std::iter;
+use std::mem;
+use std::ops::{Bound, Deref, DerefMut, RangeBounds};
+use std::ptr;
+use std::slice;
+
+// extra traits
+use std::borrow::{Borrow, BorrowMut};
+use std::hash::{Hash, Hasher};
+use std::fmt;
+
+#[cfg(feature="std")]
+use std::io;
+
+use std::mem::ManuallyDrop;
+use std::mem::MaybeUninit;
+
+#[cfg(feature="serde")]
+use serde::{Serialize, Deserialize, Serializer, Deserializer};
+
+use crate::LenUint;
+use crate::errors::CapacityError;
+use crate::arrayvec_impl::ArrayVecImpl;
+use crate::utils::MakeMaybeUninit;
+
+/// A vector with a fixed capacity.
+///
+/// The `ArrayVec` is a vector backed by a fixed size array. It keeps track of
+/// the number of initialized elements. The `ArrayVec<T, CAP>` is parameterized
+/// by `T` for the element type and `CAP` for the maximum capacity.
+///
+/// `CAP` is of type `usize` but is range limited to `u32::MAX`; attempting to create larger
+/// arrayvecs with larger capacity will panic.
+///
+/// The vector is a contiguous value (storing the elements inline) that you can store directly on
+/// the stack if needed.
+///
+/// It offers a simple API but also dereferences to a slice, so that the full slice API is
+/// available. The ArrayVec can be converted into a by value iterator.
+pub struct ArrayVec<T, const CAP: usize> {
+ // the `len` first elements of the array are initialized
+ xs: [MaybeUninit<T>; CAP],
+ len: LenUint,
+}
+
+impl<T, const CAP: usize> Drop for ArrayVec<T, CAP> {
+ fn drop(&mut self) {
+ self.clear();
+
+ // MaybeUninit inhibits array's drop
+ }
+}
+
+macro_rules! panic_oob {
+ ($method_name:expr, $index:expr, $len:expr) => {
+ panic!(concat!("ArrayVec::", $method_name, ": index {} is out of bounds in vector of length {}"),
+ $index, $len)
+ }
+}
+
+impl<T, const CAP: usize> ArrayVec<T, CAP> {
+ /// Capacity
+ const CAPACITY: usize = CAP;
+
+ /// Create a new empty `ArrayVec`.
+ ///
+ /// The maximum capacity is given by the generic parameter `CAP`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 16>::new();
+ /// array.push(1);
+ /// array.push(2);
+ /// assert_eq!(&array[..], &[1, 2]);
+ /// assert_eq!(array.capacity(), 16);
+ /// ```
+ pub fn new() -> ArrayVec<T, CAP> {
+ assert_capacity_limit!(CAP);
+ unsafe {
+ ArrayVec { xs: MaybeUninit::uninit().assume_init(), len: 0 }
+ }
+ }
+
+ /// Create a new empty `ArrayVec` (const fn).
+ ///
+ /// The maximum capacity is given by the generic parameter `CAP`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// static ARRAY: ArrayVec<u8, 1024> = ArrayVec::new_const();
+ /// ```
+ pub const fn new_const() -> ArrayVec<T, CAP> {
+ assert_capacity_limit_const!(CAP);
+ ArrayVec { xs: MakeMaybeUninit::ARRAY, len: 0 }
+ }
+
+ /// Return the number of elements in the `ArrayVec`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ /// array.pop();
+ /// assert_eq!(array.len(), 2);
+ /// ```
+ #[inline(always)]
+ pub const fn len(&self) -> usize { self.len as usize }
+
+ /// Returns whether the `ArrayVec` is empty.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1]);
+ /// array.pop();
+ /// assert_eq!(array.is_empty(), true);
+ /// ```
+ #[inline]
+ pub const fn is_empty(&self) -> bool { self.len() == 0 }
+
+ /// Return the capacity of the `ArrayVec`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let array = ArrayVec::from([1, 2, 3]);
+ /// assert_eq!(array.capacity(), 3);
+ /// ```
+ #[inline(always)]
+ pub const fn capacity(&self) -> usize { CAP }
+
+ /// Return true if the `ArrayVec` is completely filled to its capacity, false otherwise.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 1>::new();
+ /// assert!(!array.is_full());
+ /// array.push(1);
+ /// assert!(array.is_full());
+ /// ```
+ pub const fn is_full(&self) -> bool { self.len() == self.capacity() }
+
+ /// Returns the capacity left in the `ArrayVec`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ /// array.pop();
+ /// assert_eq!(array.remaining_capacity(), 1);
+ /// ```
+ pub const fn remaining_capacity(&self) -> usize {
+ self.capacity() - self.len()
+ }
+
+ /// Push `element` to the end of the vector.
+ ///
+ /// ***Panics*** if the vector is already full.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// array.push(1);
+ /// array.push(2);
+ ///
+ /// assert_eq!(&array[..], &[1, 2]);
+ /// ```
+ pub fn push(&mut self, element: T) {
+ ArrayVecImpl::push(self, element)
+ }
+
+ /// Push `element` to the end of the vector.
+ ///
+ /// Return `Ok` if the push succeeds, or return an error if the vector
+ /// is already full.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// let push1 = array.try_push(1);
+ /// let push2 = array.try_push(2);
+ ///
+ /// assert!(push1.is_ok());
+ /// assert!(push2.is_ok());
+ ///
+ /// assert_eq!(&array[..], &[1, 2]);
+ ///
+ /// let overflow = array.try_push(3);
+ ///
+ /// assert!(overflow.is_err());
+ /// ```
+ pub fn try_push(&mut self, element: T) -> Result<(), CapacityError<T>> {
+ ArrayVecImpl::try_push(self, element)
+ }
+
+ /// Push `element` to the end of the vector without checking the capacity.
+ ///
+ /// It is up to the caller to ensure the capacity of the vector is
+ /// sufficiently large.
+ ///
+ /// This method uses *debug assertions* to check that the arrayvec is not full.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// if array.len() + 2 <= array.capacity() {
+ /// unsafe {
+ /// array.push_unchecked(1);
+ /// array.push_unchecked(2);
+ /// }
+ /// }
+ ///
+ /// assert_eq!(&array[..], &[1, 2]);
+ /// ```
+ pub unsafe fn push_unchecked(&mut self, element: T) {
+ ArrayVecImpl::push_unchecked(self, element)
+ }
+
+ /// Shortens the vector, keeping the first `len` elements and dropping
+ /// the rest.
+ ///
+ /// If `len` is greater than the vector’s current length this has no
+ /// effect.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3, 4, 5]);
+ /// array.truncate(3);
+ /// assert_eq!(&array[..], &[1, 2, 3]);
+ /// array.truncate(4);
+ /// assert_eq!(&array[..], &[1, 2, 3]);
+ /// ```
+ pub fn truncate(&mut self, new_len: usize) {
+ ArrayVecImpl::truncate(self, new_len)
+ }
+
+ /// Remove all elements in the vector.
+ pub fn clear(&mut self) {
+ ArrayVecImpl::clear(self)
+ }
+
+
+ /// Get pointer to where element at `index` would be
+ unsafe fn get_unchecked_ptr(&mut self, index: usize) -> *mut T {
+ self.as_mut_ptr().add(index)
+ }
+
+ /// Insert `element` at position `index`.
+ ///
+ /// Shift up all elements after `index`.
+ ///
+ /// It is an error if the index is greater than the length or if the
+ /// arrayvec is full.
+ ///
+ /// ***Panics*** if the array is full or the `index` is out of bounds. See
+ /// `try_insert` for fallible version.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// array.insert(0, "x");
+ /// array.insert(0, "y");
+ /// assert_eq!(&array[..], &["y", "x"]);
+ ///
+ /// ```
+ pub fn insert(&mut self, index: usize, element: T) {
+ self.try_insert(index, element).unwrap()
+ }
+
+ /// Insert `element` at position `index`.
+ ///
+ /// Shift up all elements after `index`; the `index` must be less than
+ /// or equal to the length.
+ ///
+ /// Returns an error if vector is already at full capacity.
+ ///
+ /// ***Panics*** `index` is out of bounds.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// assert!(array.try_insert(0, "x").is_ok());
+ /// assert!(array.try_insert(0, "y").is_ok());
+ /// assert!(array.try_insert(0, "z").is_err());
+ /// assert_eq!(&array[..], &["y", "x"]);
+ ///
+ /// ```
+ pub fn try_insert(&mut self, index: usize, element: T) -> Result<(), CapacityError<T>> {
+ if index > self.len() {
+ panic_oob!("try_insert", index, self.len())
+ }
+ if self.len() == self.capacity() {
+ return Err(CapacityError::new(element));
+ }
+ let len = self.len();
+
+ // follows is just like Vec<T>
+ unsafe { // infallible
+ // The spot to put the new value
+ {
+ let p: *mut _ = self.get_unchecked_ptr(index);
+ // Shift everything over to make space. (Duplicating the
+ // `index`th element into two consecutive places.)
+ ptr::copy(p, p.offset(1), len - index);
+ // Write it in, overwriting the first copy of the `index`th
+ // element.
+ ptr::write(p, element);
+ }
+ self.set_len(len + 1);
+ }
+ Ok(())
+ }
+
+ /// Remove the last element in the vector and return it.
+ ///
+ /// Return `Some(` *element* `)` if the vector is non-empty, else `None`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::<_, 2>::new();
+ ///
+ /// array.push(1);
+ ///
+ /// assert_eq!(array.pop(), Some(1));
+ /// assert_eq!(array.pop(), None);
+ /// ```
+ pub fn pop(&mut self) -> Option<T> {
+ ArrayVecImpl::pop(self)
+ }
+
+ /// Remove the element at `index` and swap the last element into its place.
+ ///
+ /// This operation is O(1).
+ ///
+ /// Return the *element* if the index is in bounds, else panic.
+ ///
+ /// ***Panics*** if the `index` is out of bounds.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ ///
+ /// assert_eq!(array.swap_remove(0), 1);
+ /// assert_eq!(&array[..], &[3, 2]);
+ ///
+ /// assert_eq!(array.swap_remove(1), 2);
+ /// assert_eq!(&array[..], &[3]);
+ /// ```
+ pub fn swap_remove(&mut self, index: usize) -> T {
+ self.swap_pop(index)
+ .unwrap_or_else(|| {
+ panic_oob!("swap_remove", index, self.len())
+ })
+ }
+
+ /// Remove the element at `index` and swap the last element into its place.
+ ///
+ /// This is a checked version of `.swap_remove`.
+ /// This operation is O(1).
+ ///
+ /// Return `Some(` *element* `)` if the index is in bounds, else `None`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ ///
+ /// assert_eq!(array.swap_pop(0), Some(1));
+ /// assert_eq!(&array[..], &[3, 2]);
+ ///
+ /// assert_eq!(array.swap_pop(10), None);
+ /// ```
+ pub fn swap_pop(&mut self, index: usize) -> Option<T> {
+ let len = self.len();
+ if index >= len {
+ return None;
+ }
+ self.swap(index, len - 1);
+ self.pop()
+ }
+
+ /// Remove the element at `index` and shift down the following elements.
+ ///
+ /// The `index` must be strictly less than the length of the vector.
+ ///
+ /// ***Panics*** if the `index` is out of bounds.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ ///
+ /// let removed_elt = array.remove(0);
+ /// assert_eq!(removed_elt, 1);
+ /// assert_eq!(&array[..], &[2, 3]);
+ /// ```
+ pub fn remove(&mut self, index: usize) -> T {
+ self.pop_at(index)
+ .unwrap_or_else(|| {
+ panic_oob!("remove", index, self.len())
+ })
+ }
+
+ /// Remove the element at `index` and shift down the following elements.
+ ///
+ /// This is a checked version of `.remove(index)`. Returns `None` if there
+ /// is no element at `index`. Otherwise, return the element inside `Some`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3]);
+ ///
+ /// assert!(array.pop_at(0).is_some());
+ /// assert_eq!(&array[..], &[2, 3]);
+ ///
+ /// assert!(array.pop_at(2).is_none());
+ /// assert!(array.pop_at(10).is_none());
+ /// ```
+ pub fn pop_at(&mut self, index: usize) -> Option<T> {
+ if index >= self.len() {
+ None
+ } else {
+ self.drain(index..index + 1).next()
+ }
+ }
+
+ /// Retains only the elements specified by the predicate.
+ ///
+ /// In other words, remove all elements `e` such that `f(&mut e)` returns false.
+ /// This method operates in place and preserves the order of the retained
+ /// elements.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut array = ArrayVec::from([1, 2, 3, 4]);
+ /// array.retain(|x| *x & 1 != 0 );
+ /// assert_eq!(&array[..], &[1, 3]);
+ /// ```
+ pub fn retain<F>(&mut self, mut f: F)
+ where F: FnMut(&mut T) -> bool
+ {
+ // Check the implementation of
+ // https://doc.rust-lang.org/std/vec/struct.Vec.html#method.retain
+ // for safety arguments (especially regarding panics in f and when
+ // dropping elements). Implementation closely mirrored here.
+
+ let original_len = self.len();
+ unsafe { self.set_len(0) };
+
+ struct BackshiftOnDrop<'a, T, const CAP: usize> {
+ v: &'a mut ArrayVec<T, CAP>,
+ processed_len: usize,
+ deleted_cnt: usize,
+ original_len: usize,
+ }
+
+ impl<T, const CAP: usize> Drop for BackshiftOnDrop<'_, T, CAP> {
+ fn drop(&mut self) {
+ if self.deleted_cnt > 0 {
+ unsafe {
+ ptr::copy(
+ self.v.as_ptr().add(self.processed_len),
+ self.v.as_mut_ptr().add(self.processed_len - self.deleted_cnt),
+ self.original_len - self.processed_len
+ );
+ }
+ }
+ unsafe {
+ self.v.set_len(self.original_len - self.deleted_cnt);
+ }
+ }
+ }
+
+ let mut g = BackshiftOnDrop { v: self, processed_len: 0, deleted_cnt: 0, original_len };
+
+ #[inline(always)]
+ fn process_one<F: FnMut(&mut T) -> bool, T, const CAP: usize, const DELETED: bool>(
+ f: &mut F,
+ g: &mut BackshiftOnDrop<'_, T, CAP>
+ ) -> bool {
+ let cur = unsafe { g.v.as_mut_ptr().add(g.processed_len) };
+ if !f(unsafe { &mut *cur }) {
+ g.processed_len += 1;
+ g.deleted_cnt += 1;
+ unsafe { ptr::drop_in_place(cur) };
+ return false;
+ }
+ if DELETED {
+ unsafe {
+ let hole_slot = g.v.as_mut_ptr().add(g.processed_len - g.deleted_cnt);
+ ptr::copy_nonoverlapping(cur, hole_slot, 1);
+ }
+ }
+ g.processed_len += 1;
+ true
+ }
+
+ // Stage 1: Nothing was deleted.
+ while g.processed_len != original_len {
+ if !process_one::<F, T, CAP, false>(&mut f, &mut g) {
+ break;
+ }
+ }
+
+ // Stage 2: Some elements were deleted.
+ while g.processed_len != original_len {
+ process_one::<F, T, CAP, true>(&mut f, &mut g);
+ }
+
+ drop(g);
+ }
+
+ /// Set the vector’s length without dropping or moving out elements
+ ///
+ /// This method is `unsafe` because it changes the notion of the
+ /// number of “valid” elements in the vector. Use with care.
+ ///
+ /// This method uses *debug assertions* to check that `length` is
+ /// not greater than the capacity.
+ pub unsafe fn set_len(&mut self, length: usize) {
+ // type invariant that capacity always fits in LenUint
+ debug_assert!(length <= self.capacity());
+ self.len = length as LenUint;
+ }
+
+ /// Copy all elements from the slice and append to the `ArrayVec`.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut vec: ArrayVec<usize, 10> = ArrayVec::new();
+ /// vec.push(1);
+ /// vec.try_extend_from_slice(&[2, 3]).unwrap();
+ /// assert_eq!(&vec[..], &[1, 2, 3]);
+ /// ```
+ ///
+ /// # Errors
+ ///
+ /// This method will return an error if the capacity left (see
+ /// [`remaining_capacity`]) is smaller then the length of the provided
+ /// slice.
+ ///
+ /// [`remaining_capacity`]: #method.remaining_capacity
+ pub fn try_extend_from_slice(&mut self, other: &[T]) -> Result<(), CapacityError>
+ where T: Copy,
+ {
+ if self.remaining_capacity() < other.len() {
+ return Err(CapacityError::new(()));
+ }
+
+ let self_len = self.len();
+ let other_len = other.len();
+
+ unsafe {
+ let dst = self.get_unchecked_ptr(self_len);
+ ptr::copy_nonoverlapping(other.as_ptr(), dst, other_len);
+ self.set_len(self_len + other_len);
+ }
+ Ok(())
+ }
+
+ /// Create a draining iterator that removes the specified range in the vector
+ /// and yields the removed items from start to end. The element range is
+ /// removed even if the iterator is not consumed until the end.
+ ///
+ /// Note: It is unspecified how many elements are removed from the vector,
+ /// if the `Drain` value is leaked.
+ ///
+ /// **Panics** if the starting point is greater than the end point or if
+ /// the end point is greater than the length of the vector.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut v1 = ArrayVec::from([1, 2, 3]);
+ /// let v2: ArrayVec<_, 3> = v1.drain(0..2).collect();
+ /// assert_eq!(&v1[..], &[3]);
+ /// assert_eq!(&v2[..], &[1, 2]);
+ /// ```
+ pub fn drain<R>(&mut self, range: R) -> Drain<T, CAP>
+ where R: RangeBounds<usize>
+ {
+ // Memory safety
+ //
+ // When the Drain is first created, it shortens the length of
+ // the source vector to make sure no uninitialized or moved-from elements
+ // are accessible at all if the Drain's destructor never gets to run.
+ //
+ // Drain will ptr::read out the values to remove.
+ // When finished, remaining tail of the vec is copied back to cover
+ // the hole, and the vector length is restored to the new length.
+ //
+ let len = self.len();
+ let start = match range.start_bound() {
+ Bound::Unbounded => 0,
+ Bound::Included(&i) => i,
+ Bound::Excluded(&i) => i.saturating_add(1),
+ };
+ let end = match range.end_bound() {
+ Bound::Excluded(&j) => j,
+ Bound::Included(&j) => j.saturating_add(1),
+ Bound::Unbounded => len,
+ };
+ self.drain_range(start, end)
+ }
+
+ fn drain_range(&mut self, start: usize, end: usize) -> Drain<T, CAP>
+ {
+ let len = self.len();
+
+ // bounds check happens here (before length is changed!)
+ let range_slice: *const _ = &self[start..end];
+
+ // Calling `set_len` creates a fresh and thus unique mutable references, making all
+ // older aliases we created invalid. So we cannot call that function.
+ self.len = start as LenUint;
+
+ unsafe {
+ Drain {
+ tail_start: end,
+ tail_len: len - end,
+ iter: (*range_slice).iter(),
+ vec: self as *mut _,
+ }
+ }
+ }
+
+ /// Return the inner fixed size array, if it is full to its capacity.
+ ///
+ /// Return an `Ok` value with the array if length equals capacity,
+ /// return an `Err` with self otherwise.
+ pub fn into_inner(self) -> Result<[T; CAP], Self> {
+ if self.len() < self.capacity() {
+ Err(self)
+ } else {
+ unsafe { Ok(self.into_inner_unchecked()) }
+ }
+ }
+
+ /// Return the inner fixed size array.
+ ///
+ /// Safety:
+ /// This operation is safe if and only if length equals capacity.
+ pub unsafe fn into_inner_unchecked(self) -> [T; CAP] {
+ debug_assert_eq!(self.len(), self.capacity());
+ let self_ = ManuallyDrop::new(self);
+ let array = ptr::read(self_.as_ptr() as *const [T; CAP]);
+ array
+ }
+
+ /// Returns the ArrayVec, replacing the original with a new empty ArrayVec.
+ ///
+ /// ```
+ /// use arrayvec::ArrayVec;
+ ///
+ /// let mut v = ArrayVec::from([0, 1, 2, 3]);
+ /// assert_eq!([0, 1, 2, 3], v.take().into_inner().unwrap());
+ /// assert!(v.is_empty());
+ /// ```
+ pub fn take(&mut self) -> Self {
+ mem::replace(self, Self::new())
+ }
+
+ /// Return a slice containing all elements of the vector.
+ pub fn as_slice(&self) -> &[T] {
+ ArrayVecImpl::as_slice(self)
+ }
+
+ /// Return a mutable slice containing all elements of the vector.
+ pub fn as_mut_slice(&mut self) -> &mut [T] {
+ ArrayVecImpl::as_mut_slice(self)
+ }
+
+ /// Return a raw pointer to the vector's buffer.
+ pub fn as_ptr(&self) -> *const T {
+ ArrayVecImpl::as_ptr(self)
+ }
+
+ /// Return a raw mutable pointer to the vector's buffer.
+ pub fn as_mut_ptr(&mut self) -> *mut T {
+ ArrayVecImpl::as_mut_ptr(self)
+ }
+}
+
+impl<T, const CAP: usize> ArrayVecImpl for ArrayVec<T, CAP> {
+ type Item = T;
+ const CAPACITY: usize = CAP;
+
+ fn len(&self) -> usize { self.len() }
+
+ unsafe fn set_len(&mut self, length: usize) {
+ debug_assert!(length <= CAP);
+ self.len = length as LenUint;
+ }
+
+ fn as_ptr(&self) -> *const Self::Item {
+ self.xs.as_ptr() as _
+ }
+
+ fn as_mut_ptr(&mut self) -> *mut Self::Item {
+ self.xs.as_mut_ptr() as _
+ }
+}
+
+impl<T, const CAP: usize> Deref for ArrayVec<T, CAP> {
+ type Target = [T];
+ #[inline]
+ fn deref(&self) -> &Self::Target {
+ self.as_slice()
+ }
+}
+
+impl<T, const CAP: usize> DerefMut for ArrayVec<T, CAP> {
+ #[inline]
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ self.as_mut_slice()
+ }
+}
+
+
+/// Create an `ArrayVec` from an array.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let mut array = ArrayVec::from([1, 2, 3]);
+/// assert_eq!(array.len(), 3);
+/// assert_eq!(array.capacity(), 3);
+/// ```
+impl<T, const CAP: usize> From<[T; CAP]> for ArrayVec<T, CAP> {
+ fn from(array: [T; CAP]) -> Self {
+ let array = ManuallyDrop::new(array);
+ let mut vec = <ArrayVec<T, CAP>>::new();
+ unsafe {
+ (&*array as *const [T; CAP] as *const [MaybeUninit<T>; CAP])
+ .copy_to_nonoverlapping(&mut vec.xs as *mut [MaybeUninit<T>; CAP], 1);
+ vec.set_len(CAP);
+ }
+ vec
+ }
+}
+
+
+/// Try to create an `ArrayVec` from a slice. This will return an error if the slice was too big to
+/// fit.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+/// use std::convert::TryInto as _;
+///
+/// let array: ArrayVec<_, 4> = (&[1, 2, 3] as &[_]).try_into().unwrap();
+/// assert_eq!(array.len(), 3);
+/// assert_eq!(array.capacity(), 4);
+/// ```
+impl<T, const CAP: usize> std::convert::TryFrom<&[T]> for ArrayVec<T, CAP>
+ where T: Clone,
+{
+ type Error = CapacityError;
+
+ fn try_from(slice: &[T]) -> Result<Self, Self::Error> {
+ if Self::CAPACITY < slice.len() {
+ Err(CapacityError::new(()))
+ } else {
+ let mut array = Self::new();
+ array.extend_from_slice(slice);
+ Ok(array)
+ }
+ }
+}
+
+
+/// Iterate the `ArrayVec` with references to each element.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let array = ArrayVec::from([1, 2, 3]);
+///
+/// for elt in &array {
+/// // ...
+/// }
+/// ```
+impl<'a, T: 'a, const CAP: usize> IntoIterator for &'a ArrayVec<T, CAP> {
+ type Item = &'a T;
+ type IntoIter = slice::Iter<'a, T>;
+ fn into_iter(self) -> Self::IntoIter { self.iter() }
+}
+
+/// Iterate the `ArrayVec` with mutable references to each element.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let mut array = ArrayVec::from([1, 2, 3]);
+///
+/// for elt in &mut array {
+/// // ...
+/// }
+/// ```
+impl<'a, T: 'a, const CAP: usize> IntoIterator for &'a mut ArrayVec<T, CAP> {
+ type Item = &'a mut T;
+ type IntoIter = slice::IterMut<'a, T>;
+ fn into_iter(self) -> Self::IntoIter { self.iter_mut() }
+}
+
+/// Iterate the `ArrayVec` with each element by value.
+///
+/// The vector is consumed by this operation.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// for elt in ArrayVec::from([1, 2, 3]) {
+/// // ...
+/// }
+/// ```
+impl<T, const CAP: usize> IntoIterator for ArrayVec<T, CAP> {
+ type Item = T;
+ type IntoIter = IntoIter<T, CAP>;
+ fn into_iter(self) -> IntoIter<T, CAP> {
+ IntoIter { index: 0, v: self, }
+ }
+}
+
+
+/// By-value iterator for `ArrayVec`.
+pub struct IntoIter<T, const CAP: usize> {
+ index: usize,
+ v: ArrayVec<T, CAP>,
+}
+
+impl<T, const CAP: usize> Iterator for IntoIter<T, CAP> {
+ type Item = T;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ if self.index == self.v.len() {
+ None
+ } else {
+ unsafe {
+ let index = self.index;
+ self.index = index + 1;
+ Some(ptr::read(self.v.get_unchecked_ptr(index)))
+ }
+ }
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ let len = self.v.len() - self.index;
+ (len, Some(len))
+ }
+}
+
+impl<T, const CAP: usize> DoubleEndedIterator for IntoIter<T, CAP> {
+ fn next_back(&mut self) -> Option<Self::Item> {
+ if self.index == self.v.len() {
+ None
+ } else {
+ unsafe {
+ let new_len = self.v.len() - 1;
+ self.v.set_len(new_len);
+ Some(ptr::read(self.v.get_unchecked_ptr(new_len)))
+ }
+ }
+ }
+}
+
+impl<T, const CAP: usize> ExactSizeIterator for IntoIter<T, CAP> { }
+
+impl<T, const CAP: usize> Drop for IntoIter<T, CAP> {
+ fn drop(&mut self) {
+ // panic safety: Set length to 0 before dropping elements.
+ let index = self.index;
+ let len = self.v.len();
+ unsafe {
+ self.v.set_len(0);
+ let elements = slice::from_raw_parts_mut(
+ self.v.get_unchecked_ptr(index),
+ len - index);
+ ptr::drop_in_place(elements);
+ }
+ }
+}
+
+impl<T, const CAP: usize> Clone for IntoIter<T, CAP>
+where T: Clone,
+{
+ fn clone(&self) -> IntoIter<T, CAP> {
+ let mut v = ArrayVec::new();
+ v.extend_from_slice(&self.v[self.index..]);
+ v.into_iter()
+ }
+}
+
+impl<T, const CAP: usize> fmt::Debug for IntoIter<T, CAP>
+where
+ T: fmt::Debug,
+{
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ f.debug_list()
+ .entries(&self.v[self.index..])
+ .finish()
+ }
+}
+
+/// A draining iterator for `ArrayVec`.
+pub struct Drain<'a, T: 'a, const CAP: usize> {
+ /// Index of tail to preserve
+ tail_start: usize,
+ /// Length of tail
+ tail_len: usize,
+ /// Current remaining range to remove
+ iter: slice::Iter<'a, T>,
+ vec: *mut ArrayVec<T, CAP>,
+}
+
+unsafe impl<'a, T: Sync, const CAP: usize> Sync for Drain<'a, T, CAP> {}
+unsafe impl<'a, T: Send, const CAP: usize> Send for Drain<'a, T, CAP> {}
+
+impl<'a, T: 'a, const CAP: usize> Iterator for Drain<'a, T, CAP> {
+ type Item = T;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ self.iter.next().map(|elt|
+ unsafe {
+ ptr::read(elt as *const _)
+ }
+ )
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.iter.size_hint()
+ }
+}
+
+impl<'a, T: 'a, const CAP: usize> DoubleEndedIterator for Drain<'a, T, CAP>
+{
+ fn next_back(&mut self) -> Option<Self::Item> {
+ self.iter.next_back().map(|elt|
+ unsafe {
+ ptr::read(elt as *const _)
+ }
+ )
+ }
+}
+
+impl<'a, T: 'a, const CAP: usize> ExactSizeIterator for Drain<'a, T, CAP> {}
+
+impl<'a, T: 'a, const CAP: usize> Drop for Drain<'a, T, CAP> {
+ fn drop(&mut self) {
+ // len is currently 0 so panicking while dropping will not cause a double drop.
+
+ // exhaust self first
+ while let Some(_) = self.next() { }
+
+ if self.tail_len > 0 {
+ unsafe {
+ let source_vec = &mut *self.vec;
+ // memmove back untouched tail, update to new length
+ let start = source_vec.len();
+ let tail = self.tail_start;
+ let src = source_vec.as_ptr().add(tail);
+ let dst = source_vec.as_mut_ptr().add(start);
+ ptr::copy(src, dst, self.tail_len);
+ source_vec.set_len(start + self.tail_len);
+ }
+ }
+ }
+}
+
+struct ScopeExitGuard<T, Data, F>
+ where F: FnMut(&Data, &mut T)
+{
+ value: T,
+ data: Data,
+ f: F,
+}
+
+impl<T, Data, F> Drop for ScopeExitGuard<T, Data, F>
+ where F: FnMut(&Data, &mut T)
+{
+ fn drop(&mut self) {
+ (self.f)(&self.data, &mut self.value)
+ }
+}
+
+
+
+/// Extend the `ArrayVec` with an iterator.
+///
+/// ***Panics*** if extending the vector exceeds its capacity.
+impl<T, const CAP: usize> Extend<T> for ArrayVec<T, CAP> {
+ /// Extend the `ArrayVec` with an iterator.
+ ///
+ /// ***Panics*** if extending the vector exceeds its capacity.
+ fn extend<I: IntoIterator<Item=T>>(&mut self, iter: I) {
+ unsafe {
+ self.extend_from_iter::<_, true>(iter)
+ }
+ }
+}
+
+#[inline(never)]
+#[cold]
+fn extend_panic() {
+ panic!("ArrayVec: capacity exceeded in extend/from_iter");
+}
+
+impl<T, const CAP: usize> ArrayVec<T, CAP> {
+ /// Extend the arrayvec from the iterable.
+ ///
+ /// ## Safety
+ ///
+ /// Unsafe because if CHECK is false, the length of the input is not checked.
+ /// The caller must ensure the length of the input fits in the capacity.
+ pub(crate) unsafe fn extend_from_iter<I, const CHECK: bool>(&mut self, iterable: I)
+ where I: IntoIterator<Item = T>
+ {
+ let take = self.capacity() - self.len();
+ let len = self.len();
+ let mut ptr = raw_ptr_add(self.as_mut_ptr(), len);
+ let end_ptr = raw_ptr_add(ptr, take);
+ // Keep the length in a separate variable, write it back on scope
+ // exit. To help the compiler with alias analysis and stuff.
+ // We update the length to handle panic in the iteration of the
+ // user's iterator, without dropping any elements on the floor.
+ let mut guard = ScopeExitGuard {
+ value: &mut self.len,
+ data: len,
+ f: move |&len, self_len| {
+ **self_len = len as LenUint;
+ }
+ };
+ let mut iter = iterable.into_iter();
+ loop {
+ if let Some(elt) = iter.next() {
+ if ptr == end_ptr && CHECK { extend_panic(); }
+ debug_assert_ne!(ptr, end_ptr);
+ ptr.write(elt);
+ ptr = raw_ptr_add(ptr, 1);
+ guard.data += 1;
+ } else {
+ return; // success
+ }
+ }
+ }
+
+ /// Extend the ArrayVec with clones of elements from the slice;
+ /// the length of the slice must be <= the remaining capacity in the arrayvec.
+ pub(crate) fn extend_from_slice(&mut self, slice: &[T])
+ where T: Clone
+ {
+ let take = self.capacity() - self.len();
+ debug_assert!(slice.len() <= take);
+ unsafe {
+ let slice = if take < slice.len() { &slice[..take] } else { slice };
+ self.extend_from_iter::<_, false>(slice.iter().cloned());
+ }
+ }
+}
+
+/// Rawptr add but uses arithmetic distance for ZST
+unsafe fn raw_ptr_add<T>(ptr: *mut T, offset: usize) -> *mut T {
+ if mem::size_of::<T>() == 0 {
+ // Special case for ZST
+ (ptr as usize).wrapping_add(offset) as _
+ } else {
+ ptr.add(offset)
+ }
+}
+
+/// Create an `ArrayVec` from an iterator.
+///
+/// ***Panics*** if the number of elements in the iterator exceeds the arrayvec's capacity.
+impl<T, const CAP: usize> iter::FromIterator<T> for ArrayVec<T, CAP> {
+ /// Create an `ArrayVec` from an iterator.
+ ///
+ /// ***Panics*** if the number of elements in the iterator exceeds the arrayvec's capacity.
+ fn from_iter<I: IntoIterator<Item=T>>(iter: I) -> Self {
+ let mut array = ArrayVec::new();
+ array.extend(iter);
+ array
+ }
+}
+
+impl<T, const CAP: usize> Clone for ArrayVec<T, CAP>
+ where T: Clone
+{
+ fn clone(&self) -> Self {
+ self.iter().cloned().collect()
+ }
+
+ fn clone_from(&mut self, rhs: &Self) {
+ // recursive case for the common prefix
+ let prefix = cmp::min(self.len(), rhs.len());
+ self[..prefix].clone_from_slice(&rhs[..prefix]);
+
+ if prefix < self.len() {
+ // rhs was shorter
+ self.truncate(prefix);
+ } else {
+ let rhs_elems = &rhs[self.len()..];
+ self.extend_from_slice(rhs_elems);
+ }
+ }
+}
+
+impl<T, const CAP: usize> Hash for ArrayVec<T, CAP>
+ where T: Hash
+{
+ fn hash<H: Hasher>(&self, state: &mut H) {
+ Hash::hash(&**self, state)
+ }
+}
+
+impl<T, const CAP: usize> PartialEq for ArrayVec<T, CAP>
+ where T: PartialEq
+{
+ fn eq(&self, other: &Self) -> bool {
+ **self == **other
+ }
+}
+
+impl<T, const CAP: usize> PartialEq<[T]> for ArrayVec<T, CAP>
+ where T: PartialEq
+{
+ fn eq(&self, other: &[T]) -> bool {
+ **self == *other
+ }
+}
+
+impl<T, const CAP: usize> Eq for ArrayVec<T, CAP> where T: Eq { }
+
+impl<T, const CAP: usize> Borrow<[T]> for ArrayVec<T, CAP> {
+ fn borrow(&self) -> &[T] { self }
+}
+
+impl<T, const CAP: usize> BorrowMut<[T]> for ArrayVec<T, CAP> {
+ fn borrow_mut(&mut self) -> &mut [T] { self }
+}
+
+impl<T, const CAP: usize> AsRef<[T]> for ArrayVec<T, CAP> {
+ fn as_ref(&self) -> &[T] { self }
+}
+
+impl<T, const CAP: usize> AsMut<[T]> for ArrayVec<T, CAP> {
+ fn as_mut(&mut self) -> &mut [T] { self }
+}
+
+impl<T, const CAP: usize> fmt::Debug for ArrayVec<T, CAP> where T: fmt::Debug {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+impl<T, const CAP: usize> Default for ArrayVec<T, CAP> {
+ /// Return an empty array
+ fn default() -> ArrayVec<T, CAP> {
+ ArrayVec::new()
+ }
+}
+
+impl<T, const CAP: usize> PartialOrd for ArrayVec<T, CAP> where T: PartialOrd {
+ fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
+ (**self).partial_cmp(other)
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ (**self).lt(other)
+ }
+
+ fn le(&self, other: &Self) -> bool {
+ (**self).le(other)
+ }
+
+ fn ge(&self, other: &Self) -> bool {
+ (**self).ge(other)
+ }
+
+ fn gt(&self, other: &Self) -> bool {
+ (**self).gt(other)
+ }
+}
+
+impl<T, const CAP: usize> Ord for ArrayVec<T, CAP> where T: Ord {
+ fn cmp(&self, other: &Self) -> cmp::Ordering {
+ (**self).cmp(other)
+ }
+}
+
+#[cfg(feature="std")]
+/// `Write` appends written data to the end of the vector.
+///
+/// Requires `features="std"`.
+impl<const CAP: usize> io::Write for ArrayVec<u8, CAP> {
+ fn write(&mut self, data: &[u8]) -> io::Result<usize> {
+ let len = cmp::min(self.remaining_capacity(), data.len());
+ let _result = self.try_extend_from_slice(&data[..len]);
+ debug_assert!(_result.is_ok());
+ Ok(len)
+ }
+ fn flush(&mut self) -> io::Result<()> { Ok(()) }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<T: Serialize, const CAP: usize> Serialize for ArrayVec<T, CAP> {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where S: Serializer
+ {
+ serializer.collect_seq(self)
+ }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<'de, T: Deserialize<'de>, const CAP: usize> Deserialize<'de> for ArrayVec<T, CAP> {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+ where D: Deserializer<'de>
+ {
+ use serde::de::{Visitor, SeqAccess, Error};
+ use std::marker::PhantomData;
+
+ struct ArrayVecVisitor<'de, T: Deserialize<'de>, const CAP: usize>(PhantomData<(&'de (), [T; CAP])>);
+
+ impl<'de, T: Deserialize<'de>, const CAP: usize> Visitor<'de> for ArrayVecVisitor<'de, T, CAP> {
+ type Value = ArrayVec<T, CAP>;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ write!(formatter, "an array with no more than {} items", CAP)
+ }
+
+ fn visit_seq<SA>(self, mut seq: SA) -> Result<Self::Value, SA::Error>
+ where SA: SeqAccess<'de>,
+ {
+ let mut values = ArrayVec::<T, CAP>::new();
+
+ while let Some(value) = seq.next_element()? {
+ if let Err(_) = values.try_push(value) {
+ return Err(SA::Error::invalid_length(CAP + 1, &self));
+ }
+ }
+
+ Ok(values)
+ }
+ }
+
+ deserializer.deserialize_seq(ArrayVecVisitor::<T, CAP>(PhantomData))
+ }
+}
diff --git a/third_party/rust/arrayvec/src/arrayvec_impl.rs b/third_party/rust/arrayvec/src/arrayvec_impl.rs
new file mode 100644
index 0000000000..6c09834add
--- /dev/null
+++ b/third_party/rust/arrayvec/src/arrayvec_impl.rs
@@ -0,0 +1,86 @@
+use std::ptr;
+use std::slice;
+
+use crate::CapacityError;
+
+/// Implements basic arrayvec methods - based on a few required methods
+/// for length and element access.
+pub(crate) trait ArrayVecImpl {
+ type Item;
+ const CAPACITY: usize;
+
+ fn len(&self) -> usize;
+
+ unsafe fn set_len(&mut self, new_len: usize);
+
+ /// Return a slice containing all elements of the vector.
+ fn as_slice(&self) -> &[Self::Item] {
+ let len = self.len();
+ unsafe {
+ slice::from_raw_parts(self.as_ptr(), len)
+ }
+ }
+
+ /// Return a mutable slice containing all elements of the vector.
+ fn as_mut_slice(&mut self) -> &mut [Self::Item] {
+ let len = self.len();
+ unsafe {
+ std::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
+ }
+ }
+
+ /// Return a raw pointer to the vector's buffer.
+ fn as_ptr(&self) -> *const Self::Item;
+
+ /// Return a raw mutable pointer to the vector's buffer.
+ fn as_mut_ptr(&mut self) -> *mut Self::Item;
+
+ fn push(&mut self, element: Self::Item) {
+ self.try_push(element).unwrap()
+ }
+
+ fn try_push(&mut self, element: Self::Item) -> Result<(), CapacityError<Self::Item>> {
+ if self.len() < Self::CAPACITY {
+ unsafe {
+ self.push_unchecked(element);
+ }
+ Ok(())
+ } else {
+ Err(CapacityError::new(element))
+ }
+ }
+
+ unsafe fn push_unchecked(&mut self, element: Self::Item) {
+ let len = self.len();
+ debug_assert!(len < Self::CAPACITY);
+ ptr::write(self.as_mut_ptr().add(len), element);
+ self.set_len(len + 1);
+ }
+
+ fn pop(&mut self) -> Option<Self::Item> {
+ if self.len() == 0 {
+ return None;
+ }
+ unsafe {
+ let new_len = self.len() - 1;
+ self.set_len(new_len);
+ Some(ptr::read(self.as_ptr().add(new_len)))
+ }
+ }
+
+ fn clear(&mut self) {
+ self.truncate(0)
+ }
+
+ fn truncate(&mut self, new_len: usize) {
+ unsafe {
+ let len = self.len();
+ if new_len < len {
+ self.set_len(new_len);
+ let tail = slice::from_raw_parts_mut(self.as_mut_ptr().add(new_len), len - new_len);
+ ptr::drop_in_place(tail);
+ }
+ }
+ }
+}
+
diff --git a/third_party/rust/arrayvec/src/char.rs b/third_party/rust/arrayvec/src/char.rs
new file mode 100644
index 0000000000..939b6b472a
--- /dev/null
+++ b/third_party/rust/arrayvec/src/char.rs
@@ -0,0 +1,92 @@
+// Copyright 2012-2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+//
+// Original authors: alexchrichton, bluss
+
+// UTF-8 ranges and tags for encoding characters
+const TAG_CONT: u8 = 0b1000_0000;
+const TAG_TWO_B: u8 = 0b1100_0000;
+const TAG_THREE_B: u8 = 0b1110_0000;
+const TAG_FOUR_B: u8 = 0b1111_0000;
+const MAX_ONE_B: u32 = 0x80;
+const MAX_TWO_B: u32 = 0x800;
+const MAX_THREE_B: u32 = 0x10000;
+
+/// Placeholder
+pub struct EncodeUtf8Error;
+
+/// Encode a char into buf using UTF-8.
+///
+/// On success, return the byte length of the encoding (1, 2, 3 or 4).<br>
+/// On error, return `EncodeUtf8Error` if the buffer was too short for the char.
+///
+/// Safety: `ptr` must be writable for `len` bytes.
+#[inline]
+pub unsafe fn encode_utf8(ch: char, ptr: *mut u8, len: usize) -> Result<usize, EncodeUtf8Error>
+{
+ let code = ch as u32;
+ if code < MAX_ONE_B && len >= 1 {
+ ptr.add(0).write(code as u8);
+ return Ok(1);
+ } else if code < MAX_TWO_B && len >= 2 {
+ ptr.add(0).write((code >> 6 & 0x1F) as u8 | TAG_TWO_B);
+ ptr.add(1).write((code & 0x3F) as u8 | TAG_CONT);
+ return Ok(2);
+ } else if code < MAX_THREE_B && len >= 3 {
+ ptr.add(0).write((code >> 12 & 0x0F) as u8 | TAG_THREE_B);
+ ptr.add(1).write((code >> 6 & 0x3F) as u8 | TAG_CONT);
+ ptr.add(2).write((code & 0x3F) as u8 | TAG_CONT);
+ return Ok(3);
+ } else if len >= 4 {
+ ptr.add(0).write((code >> 18 & 0x07) as u8 | TAG_FOUR_B);
+ ptr.add(1).write((code >> 12 & 0x3F) as u8 | TAG_CONT);
+ ptr.add(2).write((code >> 6 & 0x3F) as u8 | TAG_CONT);
+ ptr.add(3).write((code & 0x3F) as u8 | TAG_CONT);
+ return Ok(4);
+ };
+ Err(EncodeUtf8Error)
+}
+
+
+#[test]
+#[cfg_attr(miri, ignore)] // Miri is too slow
+fn test_encode_utf8() {
+ // Test that all codepoints are encoded correctly
+ let mut data = [0u8; 16];
+ for codepoint in 0..=(std::char::MAX as u32) {
+ if let Some(ch) = std::char::from_u32(codepoint) {
+ for elt in &mut data { *elt = 0; }
+ let ptr = data.as_mut_ptr();
+ let len = data.len();
+ unsafe {
+ let res = encode_utf8(ch, ptr, len).ok().unwrap();
+ assert_eq!(res, ch.len_utf8());
+ }
+ let string = std::str::from_utf8(&data).unwrap();
+ assert_eq!(string.chars().next(), Some(ch));
+ }
+ }
+}
+
+#[test]
+fn test_encode_utf8_oob() {
+ // test that we report oob if the buffer is too short
+ let mut data = [0u8; 16];
+ let chars = ['a', 'α', '�', '𐍈'];
+ for (len, &ch) in (1..=4).zip(&chars) {
+ assert_eq!(len, ch.len_utf8(), "Len of ch={}", ch);
+ let ptr = data.as_mut_ptr();
+ unsafe {
+ assert!(matches::matches!(encode_utf8(ch, ptr, len - 1), Err(_)));
+ assert!(matches::matches!(encode_utf8(ch, ptr, len), Ok(_)));
+ }
+ }
+}
+
diff --git a/third_party/rust/arrayvec/src/errors.rs b/third_party/rust/arrayvec/src/errors.rs
new file mode 100644
index 0000000000..7ca3ebc4dc
--- /dev/null
+++ b/third_party/rust/arrayvec/src/errors.rs
@@ -0,0 +1,49 @@
+use std::fmt;
+#[cfg(feature="std")]
+use std::any::Any;
+#[cfg(feature="std")]
+use std::error::Error;
+
+/// Error value indicating insufficient capacity
+#[derive(Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
+pub struct CapacityError<T = ()> {
+ element: T,
+}
+
+impl<T> CapacityError<T> {
+ /// Create a new `CapacityError` from `element`.
+ pub const fn new(element: T) -> CapacityError<T> {
+ CapacityError {
+ element: element,
+ }
+ }
+
+ /// Extract the overflowing element
+ pub fn element(self) -> T {
+ self.element
+ }
+
+ /// Convert into a `CapacityError` that does not carry an element.
+ pub fn simplify(self) -> CapacityError {
+ CapacityError { element: () }
+ }
+}
+
+const CAPERROR: &'static str = "insufficient capacity";
+
+#[cfg(feature="std")]
+/// Requires `features="std"`.
+impl<T: Any> Error for CapacityError<T> {}
+
+impl<T> fmt::Display for CapacityError<T> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ write!(f, "{}", CAPERROR)
+ }
+}
+
+impl<T> fmt::Debug for CapacityError<T> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ write!(f, "{}: {}", "CapacityError", CAPERROR)
+ }
+}
+
diff --git a/third_party/rust/arrayvec/src/lib.rs b/third_party/rust/arrayvec/src/lib.rs
new file mode 100644
index 0000000000..5dc0273a70
--- /dev/null
+++ b/third_party/rust/arrayvec/src/lib.rs
@@ -0,0 +1,59 @@
+//! **arrayvec** provides the types [`ArrayVec`] and [`ArrayString`]:
+//! array-backed vector and string types, which store their contents inline.
+//!
+//! The arrayvec package has the following cargo features:
+//!
+//! - `std`
+//! - Optional, enabled by default
+//! - Use libstd; disable to use `no_std` instead.
+//!
+//! - `serde`
+//! - Optional
+//! - Enable serialization for ArrayVec and ArrayString using serde 1.x
+//!
+//! ## Rust Version
+//!
+//! This version of arrayvec requires Rust 1.51 or later.
+//!
+#![doc(html_root_url="https://docs.rs/arrayvec/0.7/")]
+#![cfg_attr(not(feature="std"), no_std)]
+
+#[cfg(feature="serde")]
+extern crate serde;
+
+#[cfg(not(feature="std"))]
+extern crate core as std;
+
+pub(crate) type LenUint = u32;
+
+macro_rules! assert_capacity_limit {
+ ($cap:expr) => {
+ if std::mem::size_of::<usize>() > std::mem::size_of::<LenUint>() {
+ if $cap > LenUint::MAX as usize {
+ panic!("ArrayVec: largest supported capacity is u32::MAX")
+ }
+ }
+ }
+}
+
+macro_rules! assert_capacity_limit_const {
+ ($cap:expr) => {
+ if std::mem::size_of::<usize>() > std::mem::size_of::<LenUint>() {
+ if $cap > LenUint::MAX as usize {
+ [/*ArrayVec: largest supported capacity is u32::MAX*/][$cap]
+ }
+ }
+ }
+}
+
+mod arrayvec_impl;
+mod arrayvec;
+mod array_string;
+mod char;
+mod errors;
+mod utils;
+
+pub use crate::array_string::ArrayString;
+pub use crate::errors::CapacityError;
+
+pub use crate::arrayvec::{ArrayVec, IntoIter, Drain};
diff --git a/third_party/rust/arrayvec/src/utils.rs b/third_party/rust/arrayvec/src/utils.rs
new file mode 100644
index 0000000000..b8e5ddb323
--- /dev/null
+++ b/third_party/rust/arrayvec/src/utils.rs
@@ -0,0 +1,11 @@
+use std::marker::PhantomData;
+use std::mem::MaybeUninit;
+
+pub(crate) struct MakeMaybeUninit<T, const N: usize>(PhantomData<fn() -> T>);
+
+impl<T, const N: usize> MakeMaybeUninit<T, N> {
+ pub(crate) const VALUE: MaybeUninit<T> = MaybeUninit::uninit();
+
+ pub(crate) const ARRAY: [MaybeUninit<T>; N] = [Self::VALUE; N];
+}
+
diff --git a/third_party/rust/arrayvec/tests/serde.rs b/third_party/rust/arrayvec/tests/serde.rs
new file mode 100644
index 0000000000..f02c693a0f
--- /dev/null
+++ b/third_party/rust/arrayvec/tests/serde.rs
@@ -0,0 +1,79 @@
+#![cfg(feature = "serde")]
+extern crate arrayvec;
+extern crate serde_test;
+
+mod array_vec {
+ use arrayvec::ArrayVec;
+
+ use serde_test::{Token, assert_tokens, assert_de_tokens_error};
+
+ #[test]
+ fn test_ser_de_empty() {
+ let vec = ArrayVec::<u32, 0>::new();
+
+ assert_tokens(&vec, &[
+ Token::Seq { len: Some(0) },
+ Token::SeqEnd,
+ ]);
+ }
+
+
+ #[test]
+ fn test_ser_de() {
+ let mut vec = ArrayVec::<u32, 3>::new();
+ vec.push(20);
+ vec.push(55);
+ vec.push(123);
+
+ assert_tokens(&vec, &[
+ Token::Seq { len: Some(3) },
+ Token::U32(20),
+ Token::U32(55),
+ Token::U32(123),
+ Token::SeqEnd,
+ ]);
+ }
+
+ #[test]
+ fn test_de_too_large() {
+ assert_de_tokens_error::<ArrayVec<u32, 2>>(&[
+ Token::Seq { len: Some(3) },
+ Token::U32(13),
+ Token::U32(42),
+ Token::U32(68),
+ ], "invalid length 3, expected an array with no more than 2 items");
+ }
+}
+
+mod array_string {
+ use arrayvec::ArrayString;
+
+ use serde_test::{Token, assert_tokens, assert_de_tokens_error};
+
+ #[test]
+ fn test_ser_de_empty() {
+ let string = ArrayString::<0>::new();
+
+ assert_tokens(&string, &[
+ Token::Str(""),
+ ]);
+ }
+
+
+ #[test]
+ fn test_ser_de() {
+ let string = ArrayString::<9>::from("1234 abcd")
+ .expect("expected exact specified capacity to be enough");
+
+ assert_tokens(&string, &[
+ Token::Str("1234 abcd"),
+ ]);
+ }
+
+ #[test]
+ fn test_de_too_large() {
+ assert_de_tokens_error::<ArrayString<2>>(&[
+ Token::Str("afd")
+ ], "invalid length 3, expected a string no more than 2 bytes long");
+ }
+}
diff --git a/third_party/rust/arrayvec/tests/tests.rs b/third_party/rust/arrayvec/tests/tests.rs
new file mode 100644
index 0000000000..2f8a5ef52e
--- /dev/null
+++ b/third_party/rust/arrayvec/tests/tests.rs
@@ -0,0 +1,793 @@
+extern crate arrayvec;
+#[macro_use] extern crate matches;
+
+use arrayvec::ArrayVec;
+use arrayvec::ArrayString;
+use std::mem;
+use arrayvec::CapacityError;
+
+use std::collections::HashMap;
+
+
+#[test]
+fn test_simple() {
+ use std::ops::Add;
+
+ let mut vec: ArrayVec<Vec<i32>, 3> = ArrayVec::new();
+
+ vec.push(vec![1, 2, 3, 4]);
+ vec.push(vec![10]);
+ vec.push(vec![-1, 13, -2]);
+
+ for elt in &vec {
+ assert_eq!(elt.iter().fold(0, Add::add), 10);
+ }
+
+ let sum_len = vec.into_iter().map(|x| x.len()).fold(0, Add::add);
+ assert_eq!(sum_len, 8);
+}
+
+#[test]
+fn test_capacity_left() {
+ let mut vec: ArrayVec<usize, 4> = ArrayVec::new();
+ assert_eq!(vec.remaining_capacity(), 4);
+ vec.push(1);
+ assert_eq!(vec.remaining_capacity(), 3);
+ vec.push(2);
+ assert_eq!(vec.remaining_capacity(), 2);
+ vec.push(3);
+ assert_eq!(vec.remaining_capacity(), 1);
+ vec.push(4);
+ assert_eq!(vec.remaining_capacity(), 0);
+}
+
+#[test]
+fn test_extend_from_slice() {
+ let mut vec: ArrayVec<usize, 10> = ArrayVec::new();
+
+ vec.try_extend_from_slice(&[1, 2, 3]).unwrap();
+ assert_eq!(vec.len(), 3);
+ assert_eq!(&vec[..], &[1, 2, 3]);
+ assert_eq!(vec.pop(), Some(3));
+ assert_eq!(&vec[..], &[1, 2]);
+}
+
+#[test]
+fn test_extend_from_slice_error() {
+ let mut vec: ArrayVec<usize, 10> = ArrayVec::new();
+
+ vec.try_extend_from_slice(&[1, 2, 3]).unwrap();
+ let res = vec.try_extend_from_slice(&[0; 8]);
+ assert_matches!(res, Err(_));
+
+ let mut vec: ArrayVec<usize, 0> = ArrayVec::new();
+ let res = vec.try_extend_from_slice(&[0; 1]);
+ assert_matches!(res, Err(_));
+}
+
+#[test]
+fn test_try_from_slice_error() {
+ use arrayvec::ArrayVec;
+ use std::convert::TryInto as _;
+
+ let res: Result<ArrayVec<_, 2>, _> = (&[1, 2, 3] as &[_]).try_into();
+ assert_matches!(res, Err(_));
+}
+
+#[test]
+fn test_u16_index() {
+ const N: usize = 4096;
+ let mut vec: ArrayVec<_, N> = ArrayVec::new();
+ for _ in 0..N {
+ assert!(vec.try_push(1u8).is_ok());
+ }
+ assert!(vec.try_push(0).is_err());
+ assert_eq!(vec.len(), N);
+}
+
+#[test]
+fn test_iter() {
+ let mut iter = ArrayVec::from([1, 2, 3]).into_iter();
+ assert_eq!(iter.size_hint(), (3, Some(3)));
+ assert_eq!(iter.next_back(), Some(3));
+ assert_eq!(iter.next(), Some(1));
+ assert_eq!(iter.next_back(), Some(2));
+ assert_eq!(iter.size_hint(), (0, Some(0)));
+ assert_eq!(iter.next_back(), None);
+}
+
+#[test]
+fn test_drop() {
+ use std::cell::Cell;
+
+ let flag = &Cell::new(0);
+
+ #[derive(Clone)]
+ struct Bump<'a>(&'a Cell<i32>);
+
+ impl<'a> Drop for Bump<'a> {
+ fn drop(&mut self) {
+ let n = self.0.get();
+ self.0.set(n + 1);
+ }
+ }
+
+ {
+ let mut array = ArrayVec::<Bump, 128>::new();
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ }
+ assert_eq!(flag.get(), 2);
+
+ // test something with the nullable pointer optimization
+ flag.set(0);
+
+ {
+ let mut array = ArrayVec::<_, 3>::new();
+ array.push(vec![Bump(flag)]);
+ array.push(vec![Bump(flag), Bump(flag)]);
+ array.push(vec![]);
+ let push4 = array.try_push(vec![Bump(flag)]);
+ assert_eq!(flag.get(), 0);
+ drop(push4);
+ assert_eq!(flag.get(), 1);
+ drop(array.pop());
+ assert_eq!(flag.get(), 1);
+ drop(array.pop());
+ assert_eq!(flag.get(), 3);
+ }
+
+ assert_eq!(flag.get(), 4);
+
+ // test into_inner
+ flag.set(0);
+ {
+ let mut array = ArrayVec::<_, 3>::new();
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ let inner = array.into_inner();
+ assert!(inner.is_ok());
+ assert_eq!(flag.get(), 0);
+ drop(inner);
+ assert_eq!(flag.get(), 3);
+ }
+
+ // test take
+ flag.set(0);
+ {
+ let mut array1 = ArrayVec::<_, 3>::new();
+ array1.push(Bump(flag));
+ array1.push(Bump(flag));
+ array1.push(Bump(flag));
+ let array2 = array1.take();
+ assert_eq!(flag.get(), 0);
+ drop(array1);
+ assert_eq!(flag.get(), 0);
+ drop(array2);
+ assert_eq!(flag.get(), 3);
+ }
+
+ // test cloning into_iter
+ flag.set(0);
+ {
+ let mut array = ArrayVec::<_, 3>::new();
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ let mut iter = array.into_iter();
+ assert_eq!(flag.get(), 0);
+ iter.next();
+ assert_eq!(flag.get(), 1);
+ let clone = iter.clone();
+ assert_eq!(flag.get(), 1);
+ drop(clone);
+ assert_eq!(flag.get(), 3);
+ drop(iter);
+ assert_eq!(flag.get(), 5);
+ }
+}
+
+#[test]
+fn test_drop_panics() {
+ use std::cell::Cell;
+ use std::panic::catch_unwind;
+ use std::panic::AssertUnwindSafe;
+
+ let flag = &Cell::new(0);
+
+ struct Bump<'a>(&'a Cell<i32>);
+
+ // Panic in the first drop
+ impl<'a> Drop for Bump<'a> {
+ fn drop(&mut self) {
+ let n = self.0.get();
+ self.0.set(n + 1);
+ if n == 0 {
+ panic!("Panic in Bump's drop");
+ }
+ }
+ }
+ // check if rust is new enough
+ flag.set(0);
+ {
+ let array = vec![Bump(flag), Bump(flag)];
+ let res = catch_unwind(AssertUnwindSafe(|| {
+ drop(array);
+ }));
+ assert!(res.is_err());
+ }
+
+ if flag.get() != 2 {
+ println!("test_drop_panics: skip, this version of Rust doesn't continue in drop_in_place");
+ return;
+ }
+
+ flag.set(0);
+ {
+ let mut array = ArrayVec::<Bump, 128>::new();
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+
+ let res = catch_unwind(AssertUnwindSafe(|| {
+ drop(array);
+ }));
+ assert!(res.is_err());
+ }
+ // Check that all the elements drop, even if the first drop panics.
+ assert_eq!(flag.get(), 3);
+
+
+ flag.set(0);
+ {
+ let mut array = ArrayVec::<Bump, 16>::new();
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+ array.push(Bump(flag));
+
+ let i = 2;
+ let tail_len = array.len() - i;
+
+ let res = catch_unwind(AssertUnwindSafe(|| {
+ array.truncate(i);
+ }));
+ assert!(res.is_err());
+ // Check that all the tail elements drop, even if the first drop panics.
+ assert_eq!(flag.get(), tail_len as i32);
+ }
+
+
+}
+
+#[test]
+fn test_extend() {
+ let mut range = 0..10;
+
+ let mut array: ArrayVec<_, 5> = range.by_ref().take(5).collect();
+ assert_eq!(&array[..], &[0, 1, 2, 3, 4]);
+ assert_eq!(range.next(), Some(5));
+
+ array.extend(range.by_ref().take(0));
+ assert_eq!(range.next(), Some(6));
+
+ let mut array: ArrayVec<_, 10> = (0..3).collect();
+ assert_eq!(&array[..], &[0, 1, 2]);
+ array.extend(3..5);
+ assert_eq!(&array[..], &[0, 1, 2, 3, 4]);
+}
+
+#[should_panic]
+#[test]
+fn test_extend_capacity_panic_1() {
+ let mut range = 0..10;
+
+ let _: ArrayVec<_, 5> = range.by_ref().collect();
+}
+
+#[should_panic]
+#[test]
+fn test_extend_capacity_panic_2() {
+ let mut range = 0..10;
+
+ let mut array: ArrayVec<_, 5> = range.by_ref().take(5).collect();
+ assert_eq!(&array[..], &[0, 1, 2, 3, 4]);
+ assert_eq!(range.next(), Some(5));
+ array.extend(range.by_ref().take(1));
+}
+
+#[test]
+fn test_is_send_sync() {
+ let data = ArrayVec::<Vec<i32>, 5>::new();
+ &data as &dyn Send;
+ &data as &dyn Sync;
+}
+
+#[test]
+fn test_compact_size() {
+ // 4 bytes + padding + length
+ type ByteArray = ArrayVec<u8, 4>;
+ println!("{}", mem::size_of::<ByteArray>());
+ assert!(mem::size_of::<ByteArray>() <= 2 * mem::size_of::<u32>());
+
+ // just length
+ type EmptyArray = ArrayVec<u8, 0>;
+ println!("{}", mem::size_of::<EmptyArray>());
+ assert!(mem::size_of::<EmptyArray>() <= mem::size_of::<u32>());
+
+ // 3 elements + padding + length
+ type QuadArray = ArrayVec<u32, 3>;
+ println!("{}", mem::size_of::<QuadArray>());
+ assert!(mem::size_of::<QuadArray>() <= 4 * 4 + mem::size_of::<u32>());
+}
+
+#[test]
+fn test_still_works_with_option_arrayvec() {
+ type RefArray = ArrayVec<&'static i32, 2>;
+ let array = Some(RefArray::new());
+ assert!(array.is_some());
+ println!("{:?}", array);
+}
+
+#[test]
+fn test_drain() {
+ let mut v = ArrayVec::from([0; 8]);
+ v.pop();
+ v.drain(0..7);
+ assert_eq!(&v[..], &[]);
+
+ v.extend(0..8);
+ v.drain(1..4);
+ assert_eq!(&v[..], &[0, 4, 5, 6, 7]);
+ let u: ArrayVec<_, 3> = v.drain(1..4).rev().collect();
+ assert_eq!(&u[..], &[6, 5, 4]);
+ assert_eq!(&v[..], &[0, 7]);
+ v.drain(..);
+ assert_eq!(&v[..], &[]);
+}
+
+#[test]
+fn test_drain_range_inclusive() {
+ let mut v = ArrayVec::from([0; 8]);
+ v.drain(0..=7);
+ assert_eq!(&v[..], &[]);
+
+ v.extend(0..8);
+ v.drain(1..=4);
+ assert_eq!(&v[..], &[0, 5, 6, 7]);
+ let u: ArrayVec<_, 3> = v.drain(1..=2).rev().collect();
+ assert_eq!(&u[..], &[6, 5]);
+ assert_eq!(&v[..], &[0, 7]);
+ v.drain(..);
+ assert_eq!(&v[..], &[]);
+}
+
+#[test]
+#[should_panic]
+fn test_drain_range_inclusive_oob() {
+ let mut v = ArrayVec::from([0; 0]);
+ v.drain(0..=0);
+}
+
+#[test]
+fn test_retain() {
+ let mut v = ArrayVec::from([0; 8]);
+ for (i, elt) in v.iter_mut().enumerate() {
+ *elt = i;
+ }
+ v.retain(|_| true);
+ assert_eq!(&v[..], &[0, 1, 2, 3, 4, 5, 6, 7]);
+ v.retain(|elt| {
+ *elt /= 2;
+ *elt % 2 == 0
+ });
+ assert_eq!(&v[..], &[0, 0, 2, 2]);
+ v.retain(|_| false);
+ assert_eq!(&v[..], &[]);
+}
+
+#[test]
+#[should_panic]
+fn test_drain_oob() {
+ let mut v = ArrayVec::from([0; 8]);
+ v.pop();
+ v.drain(0..8);
+}
+
+#[test]
+#[should_panic]
+fn test_drop_panic() {
+ struct DropPanic;
+
+ impl Drop for DropPanic {
+ fn drop(&mut self) {
+ panic!("drop");
+ }
+ }
+
+ let mut array = ArrayVec::<DropPanic, 1>::new();
+ array.push(DropPanic);
+}
+
+#[test]
+#[should_panic]
+fn test_drop_panic_into_iter() {
+ struct DropPanic;
+
+ impl Drop for DropPanic {
+ fn drop(&mut self) {
+ panic!("drop");
+ }
+ }
+
+ let mut array = ArrayVec::<DropPanic, 1>::new();
+ array.push(DropPanic);
+ array.into_iter();
+}
+
+#[test]
+fn test_insert() {
+ let mut v = ArrayVec::from([]);
+ assert_matches!(v.try_push(1), Err(_));
+
+ let mut v = ArrayVec::<_, 3>::new();
+ v.insert(0, 0);
+ v.insert(1, 1);
+ //let ret1 = v.try_insert(3, 3);
+ //assert_matches!(ret1, Err(InsertError::OutOfBounds(_)));
+ assert_eq!(&v[..], &[0, 1]);
+ v.insert(2, 2);
+ assert_eq!(&v[..], &[0, 1, 2]);
+
+ let ret2 = v.try_insert(1, 9);
+ assert_eq!(&v[..], &[0, 1, 2]);
+ assert_matches!(ret2, Err(_));
+
+ let mut v = ArrayVec::from([2]);
+ assert_matches!(v.try_insert(0, 1), Err(CapacityError { .. }));
+ assert_matches!(v.try_insert(1, 1), Err(CapacityError { .. }));
+ //assert_matches!(v.try_insert(2, 1), Err(CapacityError { .. }));
+}
+
+#[test]
+fn test_into_inner_1() {
+ let mut v = ArrayVec::from([1, 2]);
+ v.pop();
+ let u = v.clone();
+ assert_eq!(v.into_inner(), Err(u));
+}
+
+#[test]
+fn test_into_inner_2() {
+ let mut v = ArrayVec::<String, 4>::new();
+ v.push("a".into());
+ v.push("b".into());
+ v.push("c".into());
+ v.push("d".into());
+ assert_eq!(v.into_inner().unwrap(), ["a", "b", "c", "d"]);
+}
+
+#[test]
+fn test_into_inner_3() {
+ let mut v = ArrayVec::<i32, 4>::new();
+ v.extend(1..=4);
+ assert_eq!(v.into_inner().unwrap(), [1, 2, 3, 4]);
+}
+
+#[test]
+fn test_take() {
+ let mut v1 = ArrayVec::<i32, 4>::new();
+ v1.extend(1..=4);
+ let v2 = v1.take();
+ assert!(v1.into_inner().is_err());
+ assert_eq!(v2.into_inner().unwrap(), [1, 2, 3, 4]);
+}
+
+#[cfg(feature="std")]
+#[test]
+fn test_write() {
+ use std::io::Write;
+ let mut v = ArrayVec::<_, 8>::new();
+ write!(&mut v, "\x01\x02\x03").unwrap();
+ assert_eq!(&v[..], &[1, 2, 3]);
+ let r = v.write(&[9; 16]).unwrap();
+ assert_eq!(r, 5);
+ assert_eq!(&v[..], &[1, 2, 3, 9, 9, 9, 9, 9]);
+}
+
+#[test]
+fn array_clone_from() {
+ let mut v = ArrayVec::<_, 4>::new();
+ v.push(vec![1, 2]);
+ v.push(vec![3, 4, 5]);
+ v.push(vec![6]);
+ let reference = v.to_vec();
+ let mut u = ArrayVec::<_, 4>::new();
+ u.clone_from(&v);
+ assert_eq!(&u, &reference[..]);
+
+ let mut t = ArrayVec::<_, 4>::new();
+ t.push(vec![97]);
+ t.push(vec![]);
+ t.push(vec![5, 6, 2]);
+ t.push(vec![2]);
+ t.clone_from(&v);
+ assert_eq!(&t, &reference[..]);
+ t.clear();
+ t.clone_from(&v);
+ assert_eq!(&t, &reference[..]);
+}
+
+#[cfg(feature="std")]
+#[test]
+fn test_string() {
+ use std::error::Error;
+
+ let text = "hello world";
+ let mut s = ArrayString::<16>::new();
+ s.try_push_str(text).unwrap();
+ assert_eq!(&s, text);
+ assert_eq!(text, &s);
+
+ // Make sure Hash / Eq / Borrow match up so we can use HashMap
+ let mut map = HashMap::new();
+ map.insert(s, 1);
+ assert_eq!(map[text], 1);
+
+ let mut t = ArrayString::<2>::new();
+ assert!(t.try_push_str(text).is_err());
+ assert_eq!(&t, "");
+
+ t.push_str("ab");
+ // DerefMut
+ let tmut: &mut str = &mut t;
+ assert_eq!(tmut, "ab");
+
+ // Test Error trait / try
+ let t = || -> Result<(), Box<dyn Error>> {
+ let mut t = ArrayString::<2>::new();
+ t.try_push_str(text)?;
+ Ok(())
+ }();
+ assert!(t.is_err());
+}
+
+#[test]
+fn test_string_from() {
+ let text = "hello world";
+ // Test `from` constructor
+ let u = ArrayString::<11>::from(text).unwrap();
+ assert_eq!(&u, text);
+ assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_parse_from_str() {
+ let text = "hello world";
+ let u: ArrayString<11> = text.parse().unwrap();
+ assert_eq!(&u, text);
+ assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_from_bytes() {
+ let text = "hello world";
+ let u = ArrayString::from_byte_string(b"hello world").unwrap();
+ assert_eq!(&u, text);
+ assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_clone() {
+ let text = "hi";
+ let mut s = ArrayString::<4>::new();
+ s.push_str("abcd");
+ let t = ArrayString::<4>::from(text).unwrap();
+ s.clone_from(&t);
+ assert_eq!(&t, &s);
+}
+
+#[test]
+fn test_string_push() {
+ let text = "abcαβγ";
+ let mut s = ArrayString::<8>::new();
+ for c in text.chars() {
+ if let Err(_) = s.try_push(c) {
+ break;
+ }
+ }
+ assert_eq!("abcαβ", &s[..]);
+ s.push('x');
+ assert_eq!("abcαβx", &s[..]);
+ assert!(s.try_push('x').is_err());
+}
+
+
+#[test]
+fn test_insert_at_length() {
+ let mut v = ArrayVec::<_, 8>::new();
+ let result1 = v.try_insert(0, "a");
+ let result2 = v.try_insert(1, "b");
+ assert!(result1.is_ok() && result2.is_ok());
+ assert_eq!(&v[..], &["a", "b"]);
+}
+
+#[should_panic]
+#[test]
+fn test_insert_out_of_bounds() {
+ let mut v = ArrayVec::<_, 8>::new();
+ let _ = v.try_insert(1, "test");
+}
+
+/*
+ * insert that pushes out the last
+ let mut u = ArrayVec::from([1, 2, 3, 4]);
+ let ret = u.try_insert(3, 99);
+ assert_eq!(&u[..], &[1, 2, 3, 99]);
+ assert_matches!(ret, Err(_));
+ let ret = u.try_insert(4, 77);
+ assert_eq!(&u[..], &[1, 2, 3, 99]);
+ assert_matches!(ret, Err(_));
+*/
+
+#[test]
+fn test_drop_in_insert() {
+ use std::cell::Cell;
+
+ let flag = &Cell::new(0);
+
+ struct Bump<'a>(&'a Cell<i32>);
+
+ impl<'a> Drop for Bump<'a> {
+ fn drop(&mut self) {
+ let n = self.0.get();
+ self.0.set(n + 1);
+ }
+ }
+
+ flag.set(0);
+
+ {
+ let mut array = ArrayVec::<_, 2>::new();
+ array.push(Bump(flag));
+ array.insert(0, Bump(flag));
+ assert_eq!(flag.get(), 0);
+ let ret = array.try_insert(1, Bump(flag));
+ assert_eq!(flag.get(), 0);
+ assert_matches!(ret, Err(_));
+ drop(ret);
+ assert_eq!(flag.get(), 1);
+ }
+ assert_eq!(flag.get(), 3);
+}
+
+#[test]
+fn test_pop_at() {
+ let mut v = ArrayVec::<String, 4>::new();
+ let s = String::from;
+ v.push(s("a"));
+ v.push(s("b"));
+ v.push(s("c"));
+ v.push(s("d"));
+
+ assert_eq!(v.pop_at(4), None);
+ assert_eq!(v.pop_at(1), Some(s("b")));
+ assert_eq!(v.pop_at(1), Some(s("c")));
+ assert_eq!(v.pop_at(2), None);
+ assert_eq!(&v[..], &["a", "d"]);
+}
+
+#[test]
+fn test_sizes() {
+ let v = ArrayVec::from([0u8; 1 << 16]);
+ assert_eq!(vec![0u8; v.len()], &v[..]);
+}
+
+#[test]
+fn test_default() {
+ use std::net;
+ let s: ArrayString<4> = Default::default();
+ // Something without `Default` implementation.
+ let v: ArrayVec<net::TcpStream, 4> = Default::default();
+ assert_eq!(s.len(), 0);
+ assert_eq!(v.len(), 0);
+}
+
+#[cfg(feature="array-sizes-33-128")]
+#[test]
+fn test_sizes_33_128() {
+ ArrayVec::from([0u8; 52]);
+ ArrayVec::from([0u8; 127]);
+}
+
+#[cfg(feature="array-sizes-129-255")]
+#[test]
+fn test_sizes_129_255() {
+ ArrayVec::from([0u8; 237]);
+ ArrayVec::from([0u8; 255]);
+}
+
+#[test]
+fn test_extend_zst() {
+ let mut range = 0..10;
+ #[derive(Copy, Clone, PartialEq, Debug)]
+ struct Z; // Zero sized type
+
+ let mut array: ArrayVec<_, 5> = range.by_ref().take(5).map(|_| Z).collect();
+ assert_eq!(&array[..], &[Z; 5]);
+ assert_eq!(range.next(), Some(5));
+
+ array.extend(range.by_ref().take(0).map(|_| Z));
+ assert_eq!(range.next(), Some(6));
+
+ let mut array: ArrayVec<_, 10> = (0..3).map(|_| Z).collect();
+ assert_eq!(&array[..], &[Z; 3]);
+ array.extend((3..5).map(|_| Z));
+ assert_eq!(&array[..], &[Z; 5]);
+ assert_eq!(array.len(), 5);
+}
+
+#[test]
+fn test_try_from_argument() {
+ use core::convert::TryFrom;
+ let v = ArrayString::<16>::try_from(format_args!("Hello {}", 123)).unwrap();
+ assert_eq!(&v, "Hello 123");
+}
+
+#[test]
+fn allow_max_capacity_arrayvec_type() {
+ // this type is allowed to be used (but can't be constructed)
+ let _v: ArrayVec<(), {usize::MAX}>;
+}
+
+#[should_panic(expected="largest supported capacity")]
+#[test]
+fn deny_max_capacity_arrayvec_value() {
+ if mem::size_of::<usize>() <= mem::size_of::<u32>() {
+ panic!("This test does not work on this platform. 'largest supported capacity'");
+ }
+ // this type is allowed to be used (but can't be constructed)
+ let _v: ArrayVec<(), {usize::MAX}> = ArrayVec::new();
+}
+
+#[should_panic(expected="index out of bounds")]
+#[test]
+fn deny_max_capacity_arrayvec_value_const() {
+ if mem::size_of::<usize>() <= mem::size_of::<u32>() {
+ panic!("This test does not work on this platform. 'index out of bounds'");
+ }
+ // this type is allowed to be used (but can't be constructed)
+ let _v: ArrayVec<(), {usize::MAX}> = ArrayVec::new_const();
+}
+
+#[test]
+fn test_arrayvec_const_constructible() {
+ const OF_U8: ArrayVec<Vec<u8>, 10> = ArrayVec::new_const();
+
+ let mut var = OF_U8;
+ assert!(var.is_empty());
+ assert_eq!(var, ArrayVec::new());
+ var.push(vec![3, 5, 8]);
+ assert_eq!(var[..], [vec![3, 5, 8]]);
+}
+
+#[test]
+fn test_arraystring_const_constructible() {
+ const AS: ArrayString<10> = ArrayString::new_const();
+
+ let mut var = AS;
+ assert!(var.is_empty());
+ assert_eq!(var, ArrayString::new());
+ var.push_str("hello");
+ assert_eq!(var, *"hello");
+}
+
+
+#[test]
+fn test_arraystring_zero_filled_has_some_sanity_checks() {
+ let string = ArrayString::<4>::zero_filled();
+ assert_eq!(string.as_str(), "\0\0\0\0");
+ assert_eq!(string.len(), 4);
+} \ No newline at end of file