From 063f6edcc280ad62d643a0cd022fccf1cb6a869e Mon Sep 17 00:00:00 2001 From: Martin Geisler Date: Thu, 16 Nov 2023 12:13:22 +0100 Subject: Import 'predicates-core' crate Request Document: go/android-rust-importing-crates For CL Reviewers: go/android3p#cl-review For Build Team: go/ab-third-party-imports Bug: 310599818 Change-Id: I662dcdb358a1e058a7c2339e5fb9e4b54d2f7650 --- .cargo_vcs_info.json | 6 ++ Android.bp | 18 ++++ Cargo.toml | 78 +++++++++++++++ LICENSE | 1 + LICENSE-APACHE | 176 ++++++++++++++++++++++++++++++++++ LICENSE-MIT | 22 +++++ METADATA | 20 ++++ MODULE_LICENSE_APACHE2 | 0 OWNERS | 2 + README.md | 25 +++++ cargo_embargo.json | 3 + src/core.rs | 32 +++++++ src/lib.rs | 25 +++++ src/reflection.rs | 252 +++++++++++++++++++++++++++++++++++++++++++++++++ 14 files changed, 660 insertions(+) create mode 100644 .cargo_vcs_info.json create mode 100644 Android.bp create mode 100644 Cargo.toml create mode 120000 LICENSE create mode 100644 LICENSE-APACHE create mode 100644 LICENSE-MIT create mode 100644 METADATA create mode 100644 MODULE_LICENSE_APACHE2 create mode 100644 OWNERS create mode 100644 README.md create mode 100644 cargo_embargo.json create mode 100644 src/core.rs create mode 100644 src/lib.rs create mode 100644 src/reflection.rs diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json new file mode 100644 index 0000000..07e7fdd --- /dev/null +++ b/.cargo_vcs_info.json @@ -0,0 +1,6 @@ +{ + "git": { + "sha1": "7b72b706abbf1509fc74ee18e363d2bc7e8520a6" + }, + "path_in_vcs": "crates/core" +} \ No newline at end of file diff --git a/Android.bp b/Android.bp new file mode 100644 index 0000000..2a94e01 --- /dev/null +++ b/Android.bp @@ -0,0 +1,18 @@ +// This file is generated by cargo_embargo. +// Do not modify this file as changes will be overridden on upgrade. + +rust_library { + name: "libpredicates_core", + host_supported: true, + crate_name: "predicates_core", + cargo_env_compat: true, + cargo_pkg_version: "1.0.6", + srcs: ["src/lib.rs"], + edition: "2021", + apex_available: [ + "//apex_available:platform", + "//apex_available:anyapex", + ], + product_available: true, + vendor_available: true, +} diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..a1de8f1 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,78 @@ +# 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" +rust-version = "1.64.0" +name = "predicates-core" +version = "1.0.6" +authors = ["Nick Stevens "] +include = [ + "build.rs", + "src/**/*", + "Cargo.toml", + "LICENSE*", + "README.md", + "benches/**/*", + "examples/**/*", +] +description = "An API for boolean-valued predicate functions." +homepage = "https://github.com/assert-rs/predicates-rs/tree/master/crates/core" +documentation = "https://docs.rs/predicates-core" +readme = "README.md" +keywords = [ + "predicate", + "boolean", + "combinatorial", + "match", + "logic", +] +categories = [ + "data-structures", + "rust-patterns", +] +license = "MIT OR Apache-2.0" +repository = "https://github.com/assert-rs/predicates-rs/tree/master/crates/core" + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = "Unreleased" +replace = "{{version}}" +min = 1 + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = '\.\.\.HEAD' +replace = "...{{tag_name}}" +exactly = 1 + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = "ReleaseDate" +replace = "{{date}}" +min = 1 + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = "" +replace = """ + +## [Unreleased] - ReleaseDate +""" +exactly = 1 + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = "" +replace = """ + +[Unreleased]: https://github.com/assert-rs/predicates-rs/compare/{{tag_name}}...HEAD""" +exactly = 1 diff --git a/LICENSE b/LICENSE new file mode 120000 index 0000000..6b579aa --- /dev/null +++ b/LICENSE @@ -0,0 +1 @@ +LICENSE-APACHE \ No newline at end of file diff --git a/LICENSE-APACHE b/LICENSE-APACHE new file mode 100644 index 0000000..d9a10c0 --- /dev/null +++ b/LICENSE-APACHE @@ -0,0 +1,176 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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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/METADATA b/METADATA new file mode 100644 index 0000000..cd32702 --- /dev/null +++ b/METADATA @@ -0,0 +1,20 @@ +name: "predicates-core" +description: "An API for boolean-valued predicate functions." +third_party { + identifier { + type: "crates.io" + value: "https://crates.io/crates/predicates-core" + } + identifier { + type: "Archive" + value: "https://static.crates.io/crates/predicates-core/predicates-core-1.0.6.crate" + } + version: "1.0.6" + # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same. + license_type: NOTICE + last_upgrade_date { + year: 2023 + month: 11 + day: 6 + } +} diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2 new file mode 100644 index 0000000..e69de29 diff --git a/OWNERS b/OWNERS new file mode 100644 index 0000000..48bea6e --- /dev/null +++ b/OWNERS @@ -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..57ec3ac --- /dev/null +++ b/README.md @@ -0,0 +1,25 @@ +# predicates-core + +> Traits for **boolean-valued predicate functions** in Rust. + +[![Build Status](https://dev.azure.com/assert-rs/assert-rs/_apis/build/status/predicates-rs?branchName=master)](https://dev.azure.com/assert-rs/assert-rs/_build/latest?definitionId=1&branchName=master) +[![Documentation](https://img.shields.io/badge/docs-master-blue.svg)](https://docs.rs/predicates-core) +![License](https://img.shields.io/crates/l/predicates-core.svg) +[![Crates.io](https://img.shields.io/crates/v/predicates-core.svg?maxAge=2592000)](https://crates.io/crates/predicates-core) + +[Changelog](https://github.com/assert-rs/predicates-rs/blob/master/crates/core/CHANGELOG.md) + + +## License + +`predicates-core` is distributed under the terms of both the MIT license and the +Apache License (Version 2.0). + +See LICENSE-APACHE, and LICENSE-MIT for details. + + +## Credits + +Big thanks to [futures-rs](https://github.com/alexcrichton/futures-rs), whose +slick API design informed a lot of decisions made on the API design of this +library. diff --git a/cargo_embargo.json b/cargo_embargo.json new file mode 100644 index 0000000..9a0a579 --- /dev/null +++ b/cargo_embargo.json @@ -0,0 +1,3 @@ +{ + "tests": true +} diff --git a/src/core.rs b/src/core.rs new file mode 100644 index 0000000..b5aaa7b --- /dev/null +++ b/src/core.rs @@ -0,0 +1,32 @@ +// Copyright (c) 2018 The predicates-rs Project Developers. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +use crate::reflection; + +/// Trait for generically evaluating a type against a dynamically created +/// predicate function. +/// +/// The exact meaning of `eval` depends on the situation, but will usually +/// mean that the evaluated item is in some sort of pre-defined set. This is +/// different from `Ord` and `Eq` in that an `item` will almost never be the +/// same type as the implementing `Predicate` type. +pub trait Predicate: reflection::PredicateReflection { + /// Execute this `Predicate` against `variable`, returning the resulting + /// boolean. + fn eval(&self, variable: &Item) -> bool; + + /// Find a case that proves this predicate as `expected` when run against `variable`. + fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option> { + let actual = self.eval(variable); + if expected == actual { + Some(reflection::Case::new(None, actual)) + } else { + None + } + } +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..e0c9ace --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,25 @@ +// Copyright (c) 2018 The predicates-rs Project Developers. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Composable first-order predicate trait. +//! +//! This library implements an interface to "predicates" - boolean-valued +//! functions of one argument. This allows combinatorial logic to be created and +//! assembled at runtime and then used one or more times for evaluating values. +//! This sort of object is really useful when creating filters and checks that +//! can be changed at runtime with user interaction - it allows a clean +//! separation of concerns where the configuration code can be used to build up +//! a predicate, and then that predicate can be given to the code that does the +//! actual filtering without the filtering code knowing anything about user +//! configuration. See the examples for how this can work. + +#![warn(missing_docs, missing_debug_implementations)] + +mod core; +pub use crate::core::*; +pub mod reflection; diff --git a/src/reflection.rs b/src/reflection.rs new file mode 100644 index 0000000..120d1bd --- /dev/null +++ b/src/reflection.rs @@ -0,0 +1,252 @@ +// Copyright (c) 2018 The predicates-rs Project Developers. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Introspect into the state of a `Predicate`. + +use std::borrow; +use std::fmt; +use std::slice; + +/// Introspect the state of a `Predicate`. +pub trait PredicateReflection: fmt::Display { + /// Parameters of the current `Predicate`. + fn parameters<'a>(&'a self) -> Box> + 'a> { + let params = vec![]; + Box::new(params.into_iter()) + } + + /// Nested `Predicate`s of the current `Predicate`. + fn children<'a>(&'a self) -> Box> + 'a> { + let params = vec![]; + Box::new(params.into_iter()) + } +} + +/// A view of a `Predicate` parameter, provided by reflection. +/// +/// ```rust +/// use predicates_core; +/// +/// let param = predicates_core::reflection::Parameter::new("key", &10); +/// println!("{}", param); +/// ``` +pub struct Parameter<'a>(&'a str, &'a dyn fmt::Display); + +impl<'a> Parameter<'a> { + /// Create a new `Parameter`. + pub fn new(key: &'a str, value: &'a dyn fmt::Display) -> Self { + Self(key, value) + } + + /// Access the `Parameter` name. + pub fn name(&self) -> &str { + self.0 + } + + /// Access the `Parameter` value. + pub fn value(&self) -> &dyn fmt::Display { + self.1 + } +} + +impl<'a> fmt::Display for Parameter<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}: {}", self.0, self.1) + } +} + +impl<'a> fmt::Debug for Parameter<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "({:?}, {})", self.0, self.1) + } +} + +/// A view of a `Predicate` child, provided by reflection. +pub struct Child<'a>(&'a str, &'a dyn PredicateReflection); + +impl<'a> Child<'a> { + /// Create a new `Predicate` child. + pub fn new(key: &'a str, value: &'a dyn PredicateReflection) -> Self { + Self(key, value) + } + + /// Access the `Child`'s name. + pub fn name(&self) -> &str { + self.0 + } + + /// Access the `Child` `Predicate`. + pub fn value(&self) -> &dyn PredicateReflection { + self.1 + } +} + +impl<'a> fmt::Display for Child<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}: {}", self.0, self.1) + } +} + +impl<'a> fmt::Debug for Child<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "({:?}, {})", self.0, self.1) + } +} + +/// A descriptive explanation for why a predicate failed. +pub struct Case<'a> { + predicate: Option<&'a dyn PredicateReflection>, + result: bool, + products: Vec, + children: Vec>, +} + +impl<'a> Case<'a> { + /// Create a new `Case` describing the result of a `Predicate`. + pub fn new(predicate: Option<&'a dyn PredicateReflection>, result: bool) -> Self { + Self { + predicate, + result, + products: Default::default(), + children: Default::default(), + } + } + + /// Add an additional by product to a `Case`. + pub fn add_product(mut self, product: Product) -> Self { + self.products.push(product); + self + } + + /// Add an additional by product to a `Case`. + pub fn add_child(mut self, child: Case<'a>) -> Self { + self.children.push(child); + self + } + + /// The `Predicate` that produced this case. + pub fn predicate(&self) -> Option<&dyn PredicateReflection> { + self.predicate + } + + /// The result of this case. + pub fn result(&self) -> bool { + self.result + } + + /// Access the by-products from determining this case. + pub fn products(&self) -> CaseProducts<'_> { + CaseProducts(self.products.iter()) + } + + /// Access the sub-cases. + pub fn children(&self) -> CaseChildren<'_> { + CaseChildren(self.children.iter()) + } +} + +impl<'a> fmt::Debug for Case<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + let predicate = if let Some(ref predicate) = self.predicate { + format!("Some({})", predicate) + } else { + "None".to_owned() + }; + f.debug_struct("Case") + .field("predicate", &predicate) + .field("result", &self.result) + .field("products", &self.products) + .field("children", &self.children) + .finish() + } +} + +/// Iterator over a `Case`s by-products. +#[derive(Debug, Clone)] +pub struct CaseProducts<'a>(slice::Iter<'a, Product>); + +impl<'a> Iterator for CaseProducts<'a> { + type Item = &'a Product; + + fn next(&mut self) -> Option<&'a Product> { + self.0.next() + } + + fn size_hint(&self) -> (usize, Option) { + self.0.size_hint() + } + + fn count(self) -> usize { + self.0.count() + } +} + +/// Iterator over a `Case`s sub-cases. +#[derive(Debug, Clone)] +pub struct CaseChildren<'a>(slice::Iter<'a, Case<'a>>); + +impl<'a> Iterator for CaseChildren<'a> { + type Item = &'a Case<'a>; + + fn next(&mut self) -> Option<&'a Case<'a>> { + self.0.next() + } + + fn size_hint(&self) -> (usize, Option) { + self.0.size_hint() + } + + fn count(self) -> usize { + self.0.count() + } +} + +/// A by-product of a predicate evaluation. +/// +/// ```rust +/// use predicates_core; +/// +/// let product = predicates_core::reflection::Product::new("key", "value"); +/// println!("{}", product); +/// let product = predicates_core::reflection::Product::new(format!("key-{}", 5), 30); +/// println!("{}", product); +/// ``` +pub struct Product(borrow::Cow<'static, str>, Box); + +impl Product { + /// Create a new `Product`. + pub fn new(key: S, value: D) -> Self + where + S: Into>, + D: fmt::Display + 'static, + { + Self(key.into(), Box::new(value)) + } + + /// Access the `Product` name. + pub fn name(&self) -> &str { + self.0.as_ref() + } + + /// Access the `Product` value. + pub fn value(&self) -> &dyn fmt::Display { + &self.1 + } +} + +impl fmt::Display for Product { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}: {}", self.0, self.1) + } +} + +impl fmt::Debug for Product { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "({:?}, {})", self.0, self.1) + } +} -- cgit v1.2.3