Vendor things

third-party/vendor/semver/src/lib.rs

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+// Copyright 2012-2013 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.
+
+//! Semantic version parsing and comparison.
+//!
+//! Semantic versioning (see http://semver.org/) is a set of rules for
+//! assigning version numbers.
+//!
+//! ## SemVer overview
+//!
+//! Given a version number MAJOR.MINOR.PATCH, increment the:
+//!
+//! 1. MAJOR version when you make incompatible API changes,
+//! 2. MINOR version when you add functionality in a backwards-compatible
+//!    manner, and
+//! 3. PATCH version when you make backwards-compatible bug fixes.
+//!
+//! Additional labels for pre-release and build metadata are available as
+//! extensions to the MAJOR.MINOR.PATCH format.
+//!
+//! Any references to 'the spec' in this documentation refer to [version 2.0 of
+//! the SemVer spec](http://semver.org/spec/v2.0.0.html).
+//!
+//! ## SemVer and the Rust ecosystem
+//!
+//! Rust itself follows the SemVer specification, as does its standard
+//! libraries. The two are not tied together.
+//!
+//! [Cargo](http://crates.io), Rust's package manager, uses SemVer to determine
+//! which versions of packages you need installed.
+//!
+//! ## Versions
+//!
+//! At its simplest, the `semver` crate allows you to construct `Version`
+//! objects using the `parse` method:
+//!
+//! ```{rust}
+//! use semver::Version;
+//!
+//! assert!(Version::parse("1.2.3") == Ok(Version {
+//!    major: 1,
+//!    minor: 2,
+//!    patch: 3,
+//!    pre: vec!(),
+//!    build: vec!(),
+//! }));
+//! ```
+//!
+//! If you have multiple `Version`s, you can use the usual comparison operators
+//! to compare them:
+//!
+//! ```{rust}
+//! use semver::Version;
+//!
+//! assert!(Version::parse("1.2.3-alpha") != Version::parse("1.2.3-beta"));
+//! assert!(Version::parse("1.2.3-alpha2") >  Version::parse("1.2.0"));
+//! ```
+//!
+//! If you explicitly need to modify a Version, SemVer also allows you to
+//! increment the major, minor, and patch numbers in accordance with the spec.
+//!
+//! Please note that in order to do this, you must use a mutable Version:
+//!
+//! ```{rust}
+//! use semver::Version;
+//!
+//! let mut bugfix_release = Version::parse("1.0.0").unwrap();
+//! bugfix_release.increment_patch();
+//!
+//! assert_eq!(Ok(bugfix_release), Version::parse("1.0.1"));
+//! ```
+//!
+//! When incrementing the minor version number, the patch number resets to zero
+//! (in accordance with section 7 of the spec)
+//!
+//! ```{rust}
+//! use semver::Version;
+//!
+//! let mut feature_release = Version::parse("1.4.6").unwrap();
+//! feature_release.increment_minor();
+//!
+//! assert_eq!(Ok(feature_release), Version::parse("1.5.0"));
+//! ```
+//!
+//! Similarly, when incrementing the major version number, the patch and minor
+//! numbers reset to zero (in accordance with section 8 of the spec)
+//!
+//! ```{rust}
+//! use semver::Version;
+//!
+//! let mut chrome_release = Version::parse("41.5.5377").unwrap();
+//! chrome_release.increment_major();
+//!
+//! assert_eq!(Ok(chrome_release), Version::parse("42.0.0"));
+//! ```
+//!
+//! ## Requirements
+//!
+//! The `semver` crate also provides the ability to compare requirements, which
+//! are more complex comparisons.
+//!
+//! For example, creating a requirement that only matches versions greater than
+//! or equal to 1.0.0:
+//!
+//! ```{rust}
+//! # #![allow(unstable)]
+//! use semver::Version;
+//! use semver::VersionReq;
+//!
+//! let r = VersionReq::parse(">= 1.0.0").unwrap();
+//! let v = Version::parse("1.0.0").unwrap();
+//!
+//! assert!(r.to_string() == ">= 1.0.0".to_string());
+//! assert!(r.matches(&v))
+//! ```
+//!
+//! It also allows parsing of `~x.y.z` and `^x.y.z` requirements as defined at
+//! https://www.npmjs.org/doc/misc/semver.html
+//!
+//! **Tilde requirements** specify a minimal version with some updates:
+//!
+//! ```notrust
+//! ~1.2.3 := >=1.2.3 <1.3.0
+//! ~1.2   := >=1.2.0 <1.3.0
+//! ~1     := >=1.0.0 <2.0.0
+//! ```
+//!
+//! **Caret requirements** allow SemVer compatible updates to a specified
+//! verion, `0.x` and `0.x+1` are not considered compatible, but `1.x` and
+//! `1.x+1` are.
+//!
+//! `0.0.x` is not considered compatible with any other version.
+//! Missing minor and patch versions are desugared to `0` but allow flexibility
+//! for that value.
+//!
+//! ```notrust
+//! ^1.2.3 := >=1.2.3 <2.0.0
+//! ^0.2.3 := >=0.2.3 <0.3.0
+//! ^0.0.3 := >=0.0.3 <0.0.4
+//! ^0.0   := >=0.0.0 <0.1.0
+//! ^0     := >=0.0.0 <1.0.0
+//! ```
+//!
+//! **Wildcard requirements** allows parsing of version requirements of the
+//! formats `*`, `x.*` and `x.y.*`.
+//!
+//! ```notrust
+//! *     := >=0.0.0
+//! 1.*   := >=1.0.0 <2.0.0
+//! 1.2.* := >=1.2.0 <1.3.0
+//! ```
+
+#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
+       html_favicon_url = "https://www.rust-lang.org/favicon.ico")]
+#![deny(missing_docs)]
+#![cfg_attr(test, deny(warnings))]
+
+extern crate semver_parser;
+
+// Serialization and deserialization support for version numbers
+#[cfg(feature = "serde")]
+extern crate serde;
+
+// We take the common approach of keeping our own module system private, and
+// just re-exporting the interface that we want.
+
+pub use version::{Version, Identifier, SemVerError};
+pub use version::Identifier::{Numeric, AlphaNumeric};
+pub use version_req::{VersionReq, ReqParseError};
+
+// SemVer-compliant versions.
+mod version;
+
+// advanced version comparisons
+mod version_req;