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move to dual license, inline crate for syn2

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stelzo 2024-05-15 21:46:00 +02:00
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4
Cargo.toml
View File

@ -5,7 +5,7 @@ edition = "2021"
authors = ["Christopher Sieh <stelzo@steado.de>"]
description = "Customizable conversions for working with sensor_msgs/PointCloud2."
repository = "https://github.com/stelzo/ros_pointcloud2"
license = "MIT"
license = "MIT OR Apache-2.0"
keywords = ["ros", "pointcloud2", "pointcloud", "message"]
categories = [
"science::robotics",
@ -35,7 +35,7 @@ r2r = { version = "0.8.4", optional = true }
rayon = { version = "1", optional = true }
nalgebra = { version = "0", optional = true }
rpcl2_derive = { path = "./rpcl2_derive", optional = true }
type-layout = { git = "https://github.com/stelzo/type-layout", branch = "syn2", optional = true }
type-layout = { path = "type-layout", optional = true }
[dev-dependencies]
rand = "0.8"

201
LICENSE-APACHE Normal file
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@ -0,0 +1,201 @@
i 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
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"Legal Entity" shall mean the union of the acting entity and all
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"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
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"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
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"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
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"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
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of this License, Derivative Works shall not include works that remain
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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
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communication on electronic mailing lists, source code control systems,
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designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
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2. Grant of Copyright License. Subject to the terms and conditions of
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worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
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3. Grant of Patent License. Subject to the terms and conditions of
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(except as stated in this section) patent license to make, have made,
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meet the following conditions:
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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
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attribution notices from the Source form of the Work,
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(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
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within such NOTICE file, excluding those notices that do not
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of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
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do not modify the License. You may add Your own attribution
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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
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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.

2
LICENSE → LICENSE-MIT
View File

@ -1,6 +1,6 @@
The MIT License (MIT)
Copyright (c) 2023 Christopher Sieh
Copyright (c) 2024 Christopher Sieh
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal

14
README.md
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@ -1,6 +1,5 @@
## !! Note !!
This library is currently in development for v1.0.0, for the documentation of v0.4.0 on crates.io, visit the [docs](https://docs.rs/ros_pointcloud2/0.4.0/ros_pointcloud2/).
> [!NOTE]
> This library is currently in development for v1. For the documentation of the current live version v0.4, visit the [docs](https://docs.rs/ros_pointcloud2/0.4.0/ros_pointcloud2/).
<p align="center">
<h3 align="center">ROS PointCloud2</h3>
@ -95,10 +94,15 @@ The results are measured on an Intel i7-14700 with benchmarks from [this reposit
For minimizing the conversion overhead in general, always use the functions that best fit your use case.
## `#[no_std]`
## `no_std` Environments
The `_iter` conversions are compatible with `#[no_std]` environments when an allocator is provided. This is due to the fact that names for point fields do not have a maximum length, and PointCloud2 data vectors can have arbitrary sizes. Use `default-features = false` to disable std for this crate.
## License
[MIT](https://choosealicense.com/licenses/mit/)
Dual licensed under your choice of either of:
- [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
- [MIT License](https://opensource.org/licenses/MIT)
at your option.

27
type-layout/Cargo.toml Normal file
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@ -0,0 +1,27 @@
[package]
name = "type-layout"
description = "Derivable trait to view the layout of a struct, useful for debugging."
version = "0.2.0"
edition = "2018"
authors = ["Lucien Greathouse <me@lpghatguy.com>"]
documentation = "https://docs.rs/type-layout"
homepage = "https://github.com/LPGhatguy/type-layout"
repository = "https://github.com/LPGhatguy/type-layout"
readme = "README.md"
keywords = ["layout", "struct", "type"]
license = "MIT OR Apache-2.0"
rust-version = "1.60.0"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[features]
serde1 = ["serde"]
[workspace]
members = ["type-layout-derive", "try-crate"]
[dependencies]
type-layout-derive = { version = "0.2.0", path = "type-layout-derive" }
memoffset = "0.5"
serde = { version = "1.0.116", features = ["derive"], optional = true }

201
type-layout/LICENSE-APACHE Normal file
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@ -0,0 +1,201 @@
i 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.

19
type-layout/LICENSE-MIT Normal file
View File

@ -0,0 +1,19 @@
Copyright (c) 2020 Lucien Greathouse
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.

204
type-layout/src/lib.rs Normal file
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@ -0,0 +1,204 @@
/*!
[![GitHub CI Status](https://github.com/LPGhatguy/type-layout/workflows/CI/badge.svg)](https://github.com/LPGhatguy/type-layout/actions)
[![type-layout on crates.io](https://img.shields.io/crates/v/type-layout.svg)](https://crates.io/crates/type-layout)
[![type-layout docs](https://img.shields.io/badge/docs-docs.rs-orange.svg)](https://docs.rs/type-layout)
type-layout is a type layout debugging aid, providing a `#[derive]`able trait
that reports:
- The type's name, size, and minimum alignment
- Each field's name, type, offset, and size
- Padding due to alignment requirements
**type-layout currently only functions on structs with named fields.** This is a
temporary limitation.
## Examples
The layout of types is only defined if they're `#[repr(C)]`. This crate works on
non-`#[repr(C)]` types, but their layout is unpredictable.
```rust
use type_layout::TypeLayout;
#[derive(TypeLayout)]
#[repr(C)]
struct Foo {
a: u8,
b: u32,
}
println!("{}", Foo::type_layout());
// prints:
// Foo (size 8, alignment 4)
// | Offset | Name | Size |
// | ------ | --------- | ---- |
// | 0 | a | 1 |
// | 1 | [padding] | 3 |
// | 4 | b | 4 |
```
Over-aligned types have trailing padding, which can be a source of bugs in some
FFI scenarios:
```rust
use type_layout::TypeLayout;
#[derive(TypeLayout)]
#[repr(C, align(128))]
struct OverAligned {
value: u8,
}
println!("{}", OverAligned::type_layout());
// prints:
// OverAligned (size 128, alignment 128)
// | Offset | Name | Size |
// | ------ | --------- | ---- |
// | 0 | value | 1 |
// | 1 | [padding] | 127 |
```
## Minimum Supported Rust Version (MSRV)
type-layout supports Rust 1.34.1 and newer. Until type-layout reaches 1.0,
changes to the MSRV will require major version bumps. After 1.0, MSRV changes
will only require minor version bumps, but will need significant justification.
*/
use std::borrow::Cow;
use std::fmt::{self, Display};
use std::str;
pub use type_layout_derive::TypeLayout;
#[doc(hidden)]
pub use memoffset;
pub trait TypeLayout {
fn type_layout() -> TypeLayoutInfo;
}
#[derive(Debug)]
#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
pub struct TypeLayoutInfo {
pub name: Cow<'static, str>,
pub size: usize,
pub alignment: usize,
pub fields: Vec<Field>,
}
#[derive(Debug)]
#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
pub enum Field {
Field {
name: Cow<'static, str>,
ty: Cow<'static, str>,
size: usize,
},
Padding {
size: usize,
},
}
impl fmt::Display for TypeLayoutInfo {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
writeln!(
formatter,
"{} (size {}, alignment {})",
self.name, self.size, self.alignment
)?;
let longest_name = self
.fields
.iter()
.map(|field| match field {
Field::Field { name, .. } => name.len(),
Field::Padding { .. } => "[padding]".len(),
})
.max()
.unwrap_or(1);
let widths = RowWidths {
offset: "Offset".len(),
name: longest_name,
size: "Size".len(),
};
write_row(
formatter,
widths,
Row {
offset: "Offset",
name: "Name",
size: "Size",
},
)?;
write_row(
formatter,
widths,
Row {
offset: "------",
name: str::repeat("-", longest_name),
size: "----",
},
)?;
let mut offset = 0;
for field in &self.fields {
match field {
Field::Field { name, size, .. } => {
write_row(formatter, widths, Row { offset, name, size })?;
offset += size;
}
Field::Padding { size } => {
write_row(
formatter,
widths,
Row {
offset,
name: "[padding]",
size,
},
)?;
offset += size;
}
}
}
Ok(())
}
}
#[derive(Clone, Copy)]
struct RowWidths {
offset: usize,
name: usize,
size: usize,
}
struct Row<O, N, S> {
offset: O,
name: N,
size: S,
}
fn write_row<O: Display, N: Display, S: Display>(
formatter: &mut fmt::Formatter,
widths: RowWidths,
row: Row<O, N, S>,
) -> fmt::Result {
writeln!(
formatter,
"| {:<offset_width$} | {:<name_width$} | {:<size_width$} |",
row.offset,
row.name,
row.size,
offset_width = widths.offset,
name_width = widths.name,
size_width = widths.size
)
}

18
type-layout/type-layout-derive/Cargo.toml Normal file
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@ -0,0 +1,18 @@
[package]
name = "type-layout-derive"
description = "Derive macro implementation for type-layout crate"
version = "0.2.0"
edition = "2018"
authors = ["Lucien Greathouse <me@lpghatguy.com>"]
homepage = "https://github.com/LPGhatguy/type-layout"
license = "MIT OR Apache-2.0"
[lib]
proc-macro = true
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
syn = "2"
quote = "1.0.7"
proc-macro2 = "1.0.21"

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type-layout/type-layout-derive/src/lib.rs Normal file
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extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro2::{Ident, Literal};
use quote::{quote, quote_spanned, ToTokens};
use syn::{parse_macro_input, spanned::Spanned, Data, DeriveInput, Fields};
#[proc_macro_derive(TypeLayout)]
pub fn derive_type_layout(input: TokenStream) -> TokenStream {
// Parse the input tokens into a syntax tree
let input = parse_macro_input!(input as DeriveInput);
// Used in the quasi-quotation below as `#name`.
let name = input.ident;
let name_str = Literal::string(&name.to_string());
let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
let layout = layout_of_type(&name, &input.data);
// Build the output, possibly using quasi-quotation
let expanded = quote! {
impl #impl_generics ::type_layout::TypeLayout for #name #ty_generics #where_clause {
fn type_layout() -> ::type_layout::TypeLayoutInfo {
let mut last_field_end = 0;
let mut fields = Vec::new();
#layout
::type_layout::TypeLayoutInfo {
name: ::std::borrow::Cow::Borrowed(#name_str),
size: std::mem::size_of::<#name>(),
alignment: ::std::mem::align_of::<#name>(),
fields,
}
}
}
};
// Hand the output tokens back to the compiler
TokenStream::from(expanded)
}
fn layout_of_type(struct_name: &Ident, data: &Data) -> proc_macro2::TokenStream {
match data {
Data::Struct(data) => match &data.fields {
Fields::Named(fields) => {
let values = fields.named.iter().map(|field| {
let field_name = field.ident.as_ref().unwrap();
let field_name_str = Literal::string(&field_name.to_string());
let field_ty = &field.ty;
let field_ty_str = Literal::string(&field_ty.to_token_stream().to_string());
quote_spanned! { field.span() =>
#[allow(unused_assignments)]
{
let size = ::std::mem::size_of::<#field_ty>();
let offset = ::type_layout::memoffset::offset_of!(#struct_name, #field_name);
if offset > last_field_end {
fields.push(::type_layout::Field::Padding {
size: offset - last_field_end
});
}
fields.push(::type_layout::Field::Field {
name: ::std::borrow::Cow::Borrowed(#field_name_str),
ty: ::std::borrow::Cow::Borrowed(#field_ty_str),
size,
});
last_field_end = offset + size;
}
}
});
quote! {
#(#values)*
let struct_size = ::std::mem::size_of::<#struct_name>();
if struct_size > last_field_end {
fields.push(::type_layout::Field::Padding {
size: struct_size - last_field_end,
});
}
}
}
Fields::Unnamed(_) => unimplemented!(),
Fields::Unit => unimplemented!(),
},
Data::Enum(_) | Data::Union(_) => unimplemented!("type-layout only supports structs"),
}
}