diff options
author | Martin Geisler <mgeisler@google.com> | 2024-04-09 20:05:17 +0200 |
---|---|---|
committer | Martin Geisler <mgeisler@google.com> | 2024-04-09 20:43:58 +0200 |
commit | 17632c19193fbdd5aa30ee1d50fa28876b13dbad (patch) | |
tree | 540e09b3824e5a0be7bab45e17a0486c48d4477c | |
parent | 2144a85659ea0f58c68570eb635773b802a46f9b (diff) | |
download | uniffi_checksum_derive-upstream.tar.gz |
Import 'uniffi_checksum_derive' crateupstream
Request Document: go/android-rust-importing-crates
For CL Reviewers: go/android3p#cl-review
For Build Team: go/ab-third-party-imports
Bug: http://b/330712489
Test: m libuniffi_checksum_derive
Change-Id: Ia327cf897d4d7362c65859624a302764187c0860
-rw-r--r-- | .cargo_vcs_info.json | 6 | ||||
-rw-r--r-- | Cargo.lock | 46 | ||||
-rw-r--r-- | Cargo.toml | 43 | ||||
-rw-r--r-- | LICENSE | 373 | ||||
-rw-r--r-- | METADATA | 20 | ||||
-rw-r--r-- | MODULE_LICENSE_MPL | 0 | ||||
-rw-r--r-- | OWNERS | 2 | ||||
-rw-r--r-- | README.md | 79 | ||||
-rw-r--r-- | cargo_embargo.json | 3 | ||||
-rw-r--r-- | src/lib.rs | 138 |
10 files changed, 710 insertions, 0 deletions
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json new file mode 100644 index 0000000..4e493dd --- /dev/null +++ b/.cargo_vcs_info.json @@ -0,0 +1,6 @@ +{ + "git": { + "sha1": "d5332be35ef497255f7ce49debfd917f6a1009c7" + }, + "path_in_vcs": "uniffi_checksum_derive" +}
\ No newline at end of file diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..735e222 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,46 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "proc-macro2" +version = "1.0.79" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e" +dependencies = [ + "unicode-ident", +] + +[[package]] +name = "quote" +version = "1.0.35" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef" +dependencies = [ + "proc-macro2", +] + +[[package]] +name = "syn" +version = "2.0.53" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7383cd0e49fff4b6b90ca5670bfd3e9d6a733b3f90c686605aa7eec8c4996032" +dependencies = [ + "proc-macro2", + "quote", + "unicode-ident", +] + +[[package]] +name = "unicode-ident" +version = "1.0.12" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b" + +[[package]] +name = "uniffi_checksum_derive" +version = "0.26.1" +dependencies = [ + "quote", + "syn", +] diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..6de6dad --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,43 @@ +# 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 = "2021" +name = "uniffi_checksum_derive" +version = "0.26.1" +authors = ["Firefox Sync Team <sync-team@mozilla.com>"] +description = "a multi-language bindings generator for rust (checksum custom derive)" +homepage = "https://mozilla.github.io/uniffi-rs" +documentation = "https://mozilla.github.io/uniffi-rs" +readme = "README.md" +keywords = [ + "ffi", + "bindgen", +] +license = "MPL-2.0" +repository = "https://github.com/mozilla/uniffi-rs" + +[lib] +proc-macro = true + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "2.0" +features = [ + "derive", + "parsing", +] + +[features] +default = [] +nightly = [] @@ -0,0 +1,373 @@ +Mozilla Public License Version 2.0 +================================== + +1. Definitions +-------------- + +1.1. "Contributor" + means each individual or legal entity that creates, contributes to + the creation of, or owns Covered Software. + +1.2. "Contributor Version" + means the combination of the Contributions of others (if any) used + by a Contributor and that particular Contributor's Contribution. + +1.3. "Contribution" + means Covered Software of a particular Contributor. + +1.4. "Covered Software" + means Source Code Form to which the initial Contributor has attached + the notice in Exhibit A, the Executable Form of such Source Code + Form, and Modifications of such Source Code Form, in each case + including portions thereof. + +1.5. "Incompatible With Secondary Licenses" + means + + (a) that the initial Contributor has attached the notice described + in Exhibit B to the Covered Software; or + + (b) that the Covered Software was made available under the terms of + version 1.1 or earlier of the License, but not also under the + terms of a Secondary License. + +1.6. "Executable Form" + means any form of the work other than Source Code Form. + +1.7. "Larger Work" + means a work that combines Covered Software with other material, in + a separate file or files, that is not Covered Software. + +1.8. "License" + means this document. + +1.9. "Licensable" + means having the right to grant, to the maximum extent possible, + whether at the time of the initial grant or subsequently, any and + all of the rights conveyed by this License. + +1.10. "Modifications" + means any of the following: + + (a) any file in Source Code Form that results from an addition to, + deletion from, or modification of the contents of Covered + Software; or + + (b) any new file in Source Code Form that contains any Covered + Software. + +1.11. "Patent Claims" of a Contributor + means any patent claim(s), including without limitation, method, + process, and apparatus claims, in any patent Licensable by such + Contributor that would be infringed, but for the grant of the + License, by the making, using, selling, offering for sale, having + made, import, or transfer of either its Contributions or its + Contributor Version. + +1.12. "Secondary License" + means either the GNU General Public License, Version 2.0, the GNU + Lesser General Public License, Version 2.1, the GNU Affero General + Public License, Version 3.0, or any later versions of those + licenses. + +1.13. "Source Code Form" + means the form of the work preferred for making modifications. + +1.14. "You" (or "Your") + means an individual or a legal entity exercising rights under this + License. For legal entities, "You" includes any entity that + controls, is controlled by, or is under common control with You. For + purposes of this definition, "control" means (a) the power, direct + or indirect, to cause the direction or management of such entity, + whether by contract or otherwise, or (b) ownership of more than + fifty percent (50%) of the outstanding shares or beneficial + ownership of such entity. + +2. License Grants and Conditions +-------------------------------- + +2.1. Grants + +Each Contributor hereby grants You a world-wide, royalty-free, +non-exclusive license: + +(a) under intellectual property rights (other than patent or trademark) + Licensable by such Contributor to use, reproduce, make available, + modify, display, perform, distribute, and otherwise exploit its + Contributions, either on an unmodified basis, with Modifications, or + as part of a Larger Work; and + +(b) under Patent Claims of such Contributor to make, use, sell, offer + for sale, have made, import, and otherwise transfer either its + Contributions or its Contributor Version. + +2.2. Effective Date + +The licenses granted in Section 2.1 with respect to any Contribution +become effective for each Contribution on the date the Contributor first +distributes such Contribution. + +2.3. Limitations on Grant Scope + +The licenses granted in this Section 2 are the only rights granted under +this License. No additional rights or licenses will be implied from the +distribution or licensing of Covered Software under this License. +Notwithstanding Section 2.1(b) above, no patent license is granted by a +Contributor: + +(a) for any code that a Contributor has removed from Covered Software; + or + +(b) for infringements caused by: (i) Your and any other third party's + modifications of Covered Software, or (ii) the combination of its + Contributions with other software (except as part of its Contributor + Version); or + +(c) under Patent Claims infringed by Covered Software in the absence of + its Contributions. + +This License does not grant any rights in the trademarks, service marks, +or logos of any Contributor (except as may be necessary to comply with +the notice requirements in Section 3.4). + +2.4. Subsequent Licenses + +No Contributor makes additional grants as a result of Your choice to +distribute the Covered Software under a subsequent version of this +License (see Section 10.2) or under the terms of a Secondary License (if +permitted under the terms of Section 3.3). + +2.5. Representation + +Each Contributor represents that the Contributor believes its +Contributions are its original creation(s) or it has sufficient rights +to grant the rights to its Contributions conveyed by this License. + +2.6. Fair Use + +This License is not intended to limit any rights You have under +applicable copyright doctrines of fair use, fair dealing, or other +equivalents. + +2.7. Conditions + +Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted +in Section 2.1. + +3. Responsibilities +------------------- + +3.1. Distribution of Source Form + +All distribution of Covered Software in Source Code Form, including any +Modifications that You create or to which You contribute, must be under +the terms of this License. You must inform recipients that the Source +Code Form of the Covered Software is governed by the terms of this +License, and how they can obtain a copy of this License. You may not +attempt to alter or restrict the recipients' rights in the Source Code +Form. + +3.2. Distribution of Executable Form + +If You distribute Covered Software in Executable Form then: + +(a) such Covered Software must also be made available in Source Code + Form, as described in Section 3.1, and You must inform recipients of + the Executable Form how they can obtain a copy of such Source Code + Form by reasonable means in a timely manner, at a charge no more + than the cost of distribution to the recipient; and + +(b) You may distribute such Executable Form under the terms of this + License, or sublicense it under different terms, provided that the + license for the Executable Form does not attempt to limit or alter + the recipients' rights in the Source Code Form under this License. + +3.3. Distribution of a Larger Work + +You may create and distribute a Larger Work under terms of Your choice, +provided that You also comply with the requirements of this License for +the Covered Software. If the Larger Work is a combination of Covered +Software with a work governed by one or more Secondary Licenses, and the +Covered Software is not Incompatible With Secondary Licenses, this +License permits You to additionally distribute such Covered Software +under the terms of such Secondary License(s), so that the recipient of +the Larger Work may, at their option, further distribute the Covered +Software under the terms of either this License or such Secondary +License(s). + +3.4. Notices + +You may not remove or alter the substance of any license notices +(including copyright notices, patent notices, disclaimers of warranty, +or limitations of liability) contained within the Source Code Form of +the Covered Software, except that You may alter any license notices to +the extent required to remedy known factual inaccuracies. + +3.5. Application of Additional Terms + +You may choose to offer, and to charge a fee for, warranty, support, +indemnity or liability obligations to one or more recipients of Covered +Software. However, You may do so only on Your own behalf, and not on +behalf of any Contributor. You must make it absolutely clear that any +such warranty, support, indemnity, or liability obligation is offered by +You alone, and You hereby agree to indemnify every Contributor for any +liability incurred by such Contributor as a result of warranty, support, +indemnity or liability terms You offer. You may include additional +disclaimers of warranty and limitations of liability specific to any +jurisdiction. + +4. Inability to Comply Due to Statute or Regulation +--------------------------------------------------- + +If it is impossible for You to comply with any of the terms of this +License with respect to some or all of the Covered Software due to +statute, judicial order, or regulation then You must: (a) comply with +the terms of this License to the maximum extent possible; and (b) +describe the limitations and the code they affect. Such description must +be placed in a text file included with all distributions of the Covered +Software under this License. Except to the extent prohibited by statute +or regulation, such description must be sufficiently detailed for a +recipient of ordinary skill to be able to understand it. + +5. Termination +-------------- + +5.1. The rights granted under this License will terminate automatically +if You fail to comply with any of its terms. However, if You become +compliant, then the rights granted under this License from a particular +Contributor are reinstated (a) provisionally, unless and until such +Contributor explicitly and finally terminates Your grants, and (b) on an +ongoing basis, if such Contributor fails to notify You of the +non-compliance by some reasonable means prior to 60 days after You have +come back into compliance. Moreover, Your grants from a particular +Contributor are reinstated on an ongoing basis if such Contributor +notifies You of the non-compliance by some reasonable means, this is the +first time You have received notice of non-compliance with this License +from such Contributor, and You become compliant prior to 30 days after +Your receipt of the notice. + +5.2. If You initiate litigation against any entity by asserting a patent +infringement claim (excluding declaratory judgment actions, +counter-claims, and cross-claims) alleging that a Contributor Version +directly or indirectly infringes any patent, then the rights granted to +You by any and all Contributors for the Covered Software under Section +2.1 of this License shall terminate. + +5.3. In the event of termination under Sections 5.1 or 5.2 above, all +end user license agreements (excluding distributors and resellers) which +have been validly granted by You or Your distributors under this License +prior to termination shall survive termination. + +************************************************************************ +* * +* 6. Disclaimer of Warranty * +* ------------------------- * +* * +* Covered Software is provided under this License on an "as is" * +* basis, without warranty of any kind, either expressed, implied, or * +* statutory, including, without limitation, warranties that the * +* Covered Software is free of defects, merchantable, fit for a * +* particular purpose or non-infringing. The entire risk as to the * +* quality and performance of the Covered Software is with You. * +* Should any Covered Software prove defective in any respect, You * +* (not any Contributor) assume the cost of any necessary servicing, * +* repair, or correction. This disclaimer of warranty constitutes an * +* essential part of this License. No use of any Covered Software is * +* authorized under this License except under this disclaimer. * +* * +************************************************************************ + +************************************************************************ +* * +* 7. Limitation of Liability * +* -------------------------- * +* * +* Under no circumstances and under no legal theory, whether tort * +* (including negligence), contract, or otherwise, shall any * +* Contributor, or anyone who distributes Covered Software as * +* permitted above, be liable to You for any direct, indirect, * +* special, incidental, or consequential damages of any character * +* including, without limitation, damages for lost profits, loss of * +* goodwill, work stoppage, computer failure or malfunction, or any * +* and all other commercial damages or losses, even if such party * +* shall have been informed of the possibility of such damages. This * +* limitation of liability shall not apply to liability for death or * +* personal injury resulting from such party's negligence to the * +* extent applicable law prohibits such limitation. Some * +* jurisdictions do not allow the exclusion or limitation of * +* incidental or consequential damages, so this exclusion and * +* limitation may not apply to You. * +* * +************************************************************************ + +8. Litigation +------------- + +Any litigation relating to this License may be brought only in the +courts of a jurisdiction where the defendant maintains its principal +place of business and such litigation shall be governed by laws of that +jurisdiction, without reference to its conflict-of-law provisions. +Nothing in this Section shall prevent a party's ability to bring +cross-claims or counter-claims. + +9. Miscellaneous +---------------- + +This License represents the complete agreement concerning the subject +matter hereof. If any provision of this License is held to be +unenforceable, such provision shall be reformed only to the extent +necessary to make it enforceable. Any law or regulation which provides +that the language of a contract shall be construed against the drafter +shall not be used to construe this License against a Contributor. + +10. Versions of the License +--------------------------- + +10.1. New Versions + +Mozilla Foundation is the license steward. Except as provided in Section +10.3, no one other than the license steward has the right to modify or +publish new versions of this License. Each version will be given a +distinguishing version number. + +10.2. Effect of New Versions + +You may distribute the Covered Software under the terms of the version +of the License under which You originally received the Covered Software, +or under the terms of any subsequent version published by the license +steward. + +10.3. Modified Versions + +If you create software not governed by this License, and you want to +create a new license for such software, you may create and use a +modified version of this License if you rename the license and remove +any references to the name of the license steward (except to note that +such modified license differs from this License). + +10.4. Distributing Source Code Form that is Incompatible With Secondary +Licenses + +If You choose to distribute Source Code Form that is Incompatible With +Secondary Licenses under the terms of this version of the License, the +notice described in Exhibit B of this License must be attached. + +Exhibit A - Source Code Form License Notice +------------------------------------------- + + This Source Code Form is subject to the terms of the Mozilla Public + License, v. 2.0. If a copy of the MPL was not distributed with this + file, You can obtain one at http://mozilla.org/MPL/2.0/. + +If it is not possible or desirable to put the notice in a particular +file, then You may include the notice in a location (such as a LICENSE +file in a relevant directory) where a recipient would be likely to look +for such a notice. + +You may add additional accurate notices of copyright ownership. + +Exhibit B - "Incompatible With Secondary Licenses" Notice +--------------------------------------------------------- + + This Source Code Form is "Incompatible With Secondary Licenses", as + defined by the Mozilla Public License, v. 2.0. diff --git a/METADATA b/METADATA new file mode 100644 index 0000000..90475db --- /dev/null +++ b/METADATA @@ -0,0 +1,20 @@ +name: "uniffi_checksum_derive" +description: "a multi-language bindings generator for rust (checksum custom derive)" +third_party { + identifier { + type: "crates.io" + value: "uniffi_checksum_derive" + } + identifier { + type: "Archive" + value: "https://static.crates.io/crates/uniffi_checksum_derive/uniffi_checksum_derive-0.26.1.crate" + primary_source: true + } + version: "0.26.1" + license_type: RECIPROCAL + last_upgrade_date { + year: 2024 + month: 3 + day: 21 + } +} diff --git a/MODULE_LICENSE_MPL b/MODULE_LICENSE_MPL new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/MODULE_LICENSE_MPL @@ -0,0 +1,2 @@ +# Bug component: 688011 +include platform/prebuilts/rust:main:/OWNERS diff --git a/README.md b/README.md new file mode 100644 index 0000000..bb72360 --- /dev/null +++ b/README.md @@ -0,0 +1,79 @@ +# UniFFI - a multi-language bindings generator for Rust + +UniFFI is a toolkit for building cross-platform software components in Rust. + +For the impatient, see [**the UniFFI user guide**](https://mozilla.github.io/uniffi-rs/) +or [**the UniFFI examples**](https://github.com/mozilla/uniffi-rs/tree/main/examples#example-uniffi-components). + +By writing your core business logic in Rust and describing its interface in an "object model", +you can use UniFFI to help you: + +* Compile your Rust code into a shared library for use on different target platforms. +* Generate bindings to load and use the library from different target languages. + +You can describe your object model in an [interface definition file](https://mozilla.github.io/uniffi-rs/udl_file_spec.html) +or [by using proc-macros](https://mozilla.github.io/uniffi-rs/proc_macro/index.html). + +UniFFI is currently extensively by Mozilla in Firefox mobile and desktop browsers; +written once in Rust, auto-generated bindings allow that functionality to be called +from both Kotlin (for Android apps) and Swift (for iOS apps). +It also has a growing community of users shipping various cool things to many users. + +UniFII comes with support for **Kotlin**, **Swift**, **Python** and **Ruby** with 3rd party bindings available for **C#** and **Golang**. +Additional foreign language bindings can be developed externally and we welcome contributions to list them here. +See [Third-party foreign language bindings](#third-party-foreign-language-bindings). + +## User Guide + +You can read more about using the tool in [**the UniFFI user guide**](https://mozilla.github.io/uniffi-rs/). + +We consider it ready for production use, but UniFFI is a long way from a 1.0 release with lots of internal work still going on. +We try hard to avoid breaking simple consumers, but more advanced things might break as you upgrade over time. + +### Etymology and Pronunciation + +ˈjuːnɪfaɪ. Pronounced to rhyme with "unify". + +A portmanteau word that also puns with "unify", to signify the joining of one codebase accessed from many languages. + +uni - [Latin ūni-, from ūnus, one] +FFI - [Abbreviation, Foreign Function Interface] + +## Alternative tools + +Other tools we know of which try and solve a similarly shaped problem are: + +* [Diplomat](https://github.com/rust-diplomat/diplomat/) - see our [writeup of + the different approach taken by that tool](docs/diplomat-and-macros.md) +* [Interoptopus](https://github.com/ralfbiedert/interoptopus/) + +(Please open a PR if you think other tools should be listed!) + +## Third-party foreign language bindings + +* [Kotlin Multiplatform support](https://gitlab.com/trixnity/uniffi-kotlin-multiplatform-bindings). The repository contains Kotlin Multiplatform bindings generation for UniFFI, letting you target both JVM and Native. +* [Go bindings](https://github.com/NordSecurity/uniffi-bindgen-go) +* [C# bindings](https://github.com/NordSecurity/uniffi-bindgen-cs) +* [Dart bindings](https://github.com/NiallBunting/uniffi-rs-dart) + +### External resources + +There are a few third-party resources that make it easier to work with UniFFI: + +* [Plugin support for `.udl` files](https://github.com/Lonami/uniffi-dl) for the IDEA platform ([*uniffi-dl* in the JetBrains marketplace](https://plugins.jetbrains.com/plugin/20527-uniffi-dl)). It provides syntax highlighting, code folding, code completion, reference resolution and navigation (among others features) for the [UniFFI Definition Language (UDL)](https://mozilla.github.io/uniffi-rs/). +* [cargo swift](https://github.com/antoniusnaumann/cargo-swift), a cargo plugin to build a Swift Package from Rust code. It provides an init command for setting up a UniFFI crate and a package command for building a Swift package from Rust code - without the need for additional configuration or build scripts. + +(Please open a PR if you think other resources should be listed!) + +## Contributing + +If this tool sounds interesting to you, please help us develop it! You can: + +* View the [contributor guidelines](./docs/contributing.md). +* File or work on [issues](https://github.com/mozilla/uniffi-rs/issues) here in GitHub. +* Join discussions in the [#uniffi:mozilla.org](https://matrix.to/#/#uniffi:mozilla.org) + room on Matrix. + +## Code of Conduct + +This project is governed by Mozilla's [Community Participation Guidelines](./CODE_OF_CONDUCT.md). diff --git a/cargo_embargo.json b/cargo_embargo.json new file mode 100644 index 0000000..cb908d7 --- /dev/null +++ b/cargo_embargo.json @@ -0,0 +1,3 @@ +{ + "run_cargo": false +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..e600982 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,138 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +//! Custom derive for uniffi_meta::Checksum + +use proc_macro::TokenStream; +use quote::{format_ident, quote}; +use syn::{ + parse_macro_input, Attribute, Data, DeriveInput, Expr, ExprLit, Fields, Index, Lit, Meta, +}; + +fn has_ignore_attribute(attrs: &[Attribute]) -> bool { + attrs.iter().any(|attr| { + if attr.path().is_ident("checksum_ignore") { + if let Meta::List(_) | Meta::NameValue(_) = &attr.meta { + panic!("#[checksum_ignore] doesn't accept extra information"); + } + true + } else { + false + } + }) +} + +#[proc_macro_derive(Checksum, attributes(checksum_ignore))] +pub fn checksum_derive(input: TokenStream) -> TokenStream { + let input: DeriveInput = parse_macro_input!(input); + + let name = input.ident; + + let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl(); + + let code = match input.data { + Data::Enum(enum_) + if enum_.variants.len() == 1 + && enum_ + .variants + .iter() + .all(|variant| matches!(variant.fields, Fields::Unit)) => + { + quote!() + } + Data::Enum(enum_) => { + let mut next_discriminant = 0u64; + let match_inner = enum_.variants.iter().map(|variant| { + let ident = &variant.ident; + if has_ignore_attribute(&variant.attrs) { + panic!("#[checksum_ignore] is not supported in enums"); + } + match &variant.discriminant { + Some((_, Expr::Lit(ExprLit { lit: Lit::Int(value), .. }))) => { + next_discriminant = value.base10_parse::<u64>().unwrap(); + } + Some(_) => { + panic!("#[derive(Checksum)] doesn't support non-numeric explicit discriminants in enums"); + } + None => {} + } + let discriminant = quote! { state.write(&#next_discriminant.to_le_bytes()) }; + next_discriminant += 1; + match &variant.fields { + Fields::Unnamed(fields) => { + let field_idents = fields + .unnamed + .iter() + .enumerate() + .map(|(num, _)| format_ident!("__self_{}", num)); + let field_stmts = field_idents + .clone() + .map(|ident| quote! { Checksum::checksum(#ident, state); }); + quote! { + Self::#ident(#(#field_idents,)*) => { + #discriminant; + #(#field_stmts)* + } + } + } + Fields::Named(fields) => { + let field_idents = fields + .named + .iter() + .map(|field| field.ident.as_ref().unwrap()); + let field_stmts = fields.named.iter() + .filter(|field| !has_ignore_attribute(&field.attrs)) + .map(|field| { + let ident = field.ident.as_ref().unwrap(); + quote! { Checksum::checksum(#ident, state); } + }); + quote! { + Self::#ident { #(#field_idents,)* } => { + #discriminant; + #(#field_stmts)* + } + } + } + Fields::Unit => quote! { Self::#ident => #discriminant, }, + } + }); + quote! { + match self { + #(#match_inner)* + } + } + } + Data::Struct(struct_) => { + let stmts = struct_ + .fields + .iter() + .enumerate() + .filter_map(|(num, field)| { + (!has_ignore_attribute(&field.attrs)).then(|| match field.ident.as_ref() { + Some(ident) => quote! { Checksum::checksum(&self.#ident, state); }, + None => { + let i = Index::from(num); + quote! { Checksum::checksum(&self.#i, state); } + } + }) + }); + quote! { + #(#stmts)* + } + } + Data::Union(_) => { + panic!("#[derive(Checksum)] is not supported for unions"); + } + }; + + quote! { + #[automatically_derived] + impl #impl_generics Checksum for #name #ty_generics #where_clause { + fn checksum<__H: ::core::hash::Hasher>(&self, state: &mut __H) { + #code + } + } + } + .into() +} |