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更新libclamav库1.0.0版本

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{"files":{"Cargo.toml":"f25d88044914cb3466df43bc39a199e1589dda1aad3226c9c7e7ac4d2f8751d0","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"b7e650f3fce5c53249d1cdc608b54df156a97edd636cf9d23498d0cfe7aec63e","README.md":"ac2a0a360812436bd5798f5fe2affe7d6ed9eb7f15d6e4d73931e95b437560f2","src/channel.rs":"d2443d503d4cc469a171a51a26eca3ec0d2a58b5f7375a84542c36f1421766a8","src/date.rs":"09580a0a2008fad2ccbc43fb42a88f42221b98b01692702022a296dc9c86bf37","src/lib.rs":"760f0d29567ecaa61287088cf23cf74b3c0efbbcd3077cea5fb7c88359e96c7e","src/version.rs":"dba18a25983ec6e37b952f4cdc5219c9e5abba2c3a76cef87465e1fba6f8ac89"},"package":"49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"}

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# 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]
name = "version_check"
version = "0.9.4"
authors = ["Sergio Benitez <sb@sergio.bz>"]
exclude = ["static"]
description = "Tiny crate to check the version of the installed/running rustc."
documentation = "https://docs.rs/version_check/"
readme = "README.md"
keywords = ["version", "rustc", "minimum", "check"]
license = "MIT/Apache-2.0"
repository = "https://github.com/SergioBenitez/version_check"
[dependencies]

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The MIT License (MIT)
Copyright (c) 2017-2018 Sergio Benitez
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
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# version\_check
[![Build Status](https://github.com/SergioBenitez/version_check/workflows/CI/badge.svg)](https://github.com/SergioBenitez/version_check/actions)
[![Current Crates.io Version](https://img.shields.io/crates/v/version_check.svg)](https://crates.io/crates/version_check)
[![rustdocs on docs.rs](https://docs.rs/version_check/badge.svg)](https://docs.rs/version_check)
This tiny crate checks that the running or installed `rustc` meets some version
requirements. The version is queried by calling the Rust compiler with
`--version`. The path to the compiler is determined first via the `RUSTC`
environment variable. If it is not set, then `rustc` is used. If that fails, no
determination is made, and calls return `None`.
## Usage
Add to your `Cargo.toml` file, typically as a build dependency:
```toml
[build-dependencies]
version_check = "0.9"
```
`version_check` is compatible and compiles with Rust 1.0.0 and beyond.
## Examples
Set a `cfg` flag in `build.rs` if the running compiler was determined to be
at least version `1.13.0`:
```rust
extern crate version_check as rustc;
if rustc::is_min_version("1.13.0").unwrap_or(false) {
println!("cargo:rustc-cfg=question_mark_operator");
}
```
Check that the running compiler was released on or after `2018-12-18`:
```rust
extern crate version_check as rustc;
match rustc::is_min_date("2018-12-18") {
Some(true) => "Yep! It's recent!",
Some(false) => "No, it's older.",
None => "Couldn't determine the rustc version."
};
```
Check that the running compiler supports feature flags:
```rust
extern crate version_check as rustc;
match rustc::is_feature_flaggable() {
Some(true) => "Yes! It's a dev or nightly release!",
Some(false) => "No, it's stable or beta.",
None => "Couldn't determine the rustc version."
};
```
See the [rustdocs](https://docs.rs/version_check) for more examples and complete
documentation.
## Alternatives
This crate is dead simple with no dependencies. If you need something more and
don't care about panicking if the version cannot be obtained, or if you don't
mind adding dependencies, see [rustc_version]. If you'd instead prefer a feature
detection library that works by dynamically invoking `rustc` with a
representative code sample, see [autocfg].
[rustc_version]: https://crates.io/crates/rustc_version
[autocfg]: https://crates.io/crates/autocfg
## License
`version_check` is licensed under either of the following, at your option:
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT License ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

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use std::fmt;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
enum Kind {
Dev,
Nightly,
Beta,
Stable,
}
/// Release channel: "dev", "nightly", "beta", or "stable".
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub struct Channel(Kind);
impl Channel {
/// Reads the release channel of the running compiler. If it cannot be
/// determined (see the [top-level documentation](crate)), returns `None`.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// match Channel::read() {
/// Some(c) => format!("The channel is: {}", c),
/// None => format!("Failed to read the release channel.")
/// };
/// ```
pub fn read() -> Option<Channel> {
::get_version_and_date()
.and_then(|(version, _)| version)
.and_then(|version| Channel::parse(&version))
}
/// Parse a Rust release channel from a Rust release version string (of the
/// form `major[.minor[.patch[-channel]]]`). Returns `None` if `version` is
/// not a valid Rust version string.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.is_dev());
///
/// let nightly = Channel::parse("1.42.2-nightly").unwrap();
/// assert!(nightly.is_nightly());
///
/// let beta = Channel::parse("1.32.0-beta").unwrap();
/// assert!(beta.is_beta());
///
/// let stable = Channel::parse("1.4.0").unwrap();
/// assert!(stable.is_stable());
/// ```
pub fn parse(version: &str) -> Option<Channel> {
let version = version.trim();
if version.contains("-dev") || version == "dev" {
Some(Channel(Kind::Dev))
} else if version.contains("-nightly") || version == "nightly" {
Some(Channel(Kind::Nightly))
} else if version.contains("-beta") || version == "beta" {
Some(Channel(Kind::Beta))
} else if !version.contains("-") {
Some(Channel(Kind::Stable))
} else {
None
}
}
/// Returns the name of the release channel.
fn as_str(&self) -> &'static str {
match self.0 {
Kind::Dev => "dev",
Kind::Beta => "beta",
Kind::Nightly => "nightly",
Kind::Stable => "stable",
}
}
/// Returns `true` if this channel supports feature flags. In other words,
/// returns `true` if the channel is either `dev` or `nightly`.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.supports_features());
///
/// let nightly = Channel::parse("1.42.2-nightly").unwrap();
/// assert!(nightly.supports_features());
///
/// let beta = Channel::parse("1.32.0-beta").unwrap();
/// assert!(!beta.supports_features());
///
/// let stable = Channel::parse("1.4.0").unwrap();
/// assert!(!stable.supports_features());
/// ```
pub fn supports_features(&self) -> bool {
match self.0 {
Kind::Dev | Kind::Nightly => true,
Kind::Beta | Kind::Stable => false
}
}
/// Returns `true` if this channel is `dev` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.is_dev());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_dev());
/// ```
pub fn is_dev(&self) -> bool {
match self.0 {
Kind::Dev => true,
_ => false
}
}
/// Returns `true` if this channel is `nightly` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let nightly = Channel::parse("1.3.0-nightly").unwrap();
/// assert!(nightly.is_nightly());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_nightly());
/// ```
pub fn is_nightly(&self) -> bool {
match self.0 {
Kind::Nightly => true,
_ => false
}
}
/// Returns `true` if this channel is `beta` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let beta = Channel::parse("1.3.0-beta").unwrap();
/// assert!(beta.is_beta());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_beta());
/// ```
pub fn is_beta(&self) -> bool {
match self.0 {
Kind::Beta => true,
_ => false
}
}
/// Returns `true` if this channel is `stable` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(stable.is_stable());
///
/// let beta = Channel::parse("1.3.0-beta").unwrap();
/// assert!(!beta.is_stable());
/// ```
pub fn is_stable(&self) -> bool {
match self.0 {
Kind::Stable => true,
_ => false
}
}
}
impl fmt::Display for Channel {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.as_str())
}
}

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use std::fmt;
/// Release date including year, month, and day.
// Internal storage is: y[31..9] | m[8..5] | d[5...0].
#[derive(Debug, PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
pub struct Date(u32);
impl Date {
/// Reads the release date of the running compiler. If it cannot be
/// determined (see the [top-level documentation](crate)), returns `None`.
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// match Date::read() {
/// Some(d) => format!("The release date is: {}", d),
/// None => format!("Failed to read the release date.")
/// };
/// ```
pub fn read() -> Option<Date> {
::get_version_and_date()
.and_then(|(_, date)| date)
.and_then(|date| Date::parse(&date))
}
/// Parse a release date of the form `%Y-%m-%d`. Returns `None` if `date` is
/// not in `%Y-%m-%d` format.
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// let date = Date::parse("2016-04-20").unwrap();
///
/// assert!(date.at_least("2016-01-10"));
/// assert!(date.at_most("2016-04-20"));
/// assert!(date.exactly("2016-04-20"));
///
/// assert!(Date::parse("2021-12-31").unwrap().exactly("2021-12-31"));
///
/// assert!(Date::parse("March 13, 2018").is_none());
/// assert!(Date::parse("1-2-3-4-5").is_none());
/// assert!(Date::parse("2020-300-23120").is_none());
/// assert!(Date::parse("2020-12-12 1").is_none());
/// assert!(Date::parse("2020-10").is_none());
/// assert!(Date::parse("2020").is_none());
/// ```
pub fn parse(date: &str) -> Option<Date> {
let mut ymd = [0u16; 3];
for (i, split) in date.split('-').map(|s| s.parse::<u16>()).enumerate() {
ymd[i] = match (i, split) {
(3, _) | (_, Err(_)) => return None,
(_, Ok(v)) => v,
};
}
let (year, month, day) = (ymd[0], ymd[1], ymd[2]);
if year == 0 || month == 0 || month > 12 || day == 0 || day > 31 {
return None;
}
Some(Date::from_ymd(year, month as u8, day as u8))
}
/// Creates a `Date` from `(year, month, day)` date components.
///
/// Does not check the validity of `year`, `month`, or `day`, but `year` is
/// truncated to 23 bits (% 8,388,608), `month` to 4 bits (% 16), and `day`
/// to 5 bits (% 32).
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// assert!(Date::from_ymd(2021, 7, 30).exactly("2021-07-30"));
/// assert!(Date::from_ymd(2010, 3, 23).exactly("2010-03-23"));
/// assert!(Date::from_ymd(2090, 1, 31).exactly("2090-01-31"));
///
/// // Truncation: 33 % 32 == 0x21 & 0x1F == 1.
/// assert!(Date::from_ymd(2090, 1, 33).exactly("2090-01-01"));
/// ```
pub fn from_ymd(year: u16, month: u8, day: u8) -> Date {
let year = (year as u32) << 9;
let month = ((month as u32) & 0xF) << 5;
let day = (day as u32) & 0x1F;
Date(year | month | day)
}
/// Return the original (YYYY, MM, DD).
fn to_ymd(&self) -> (u16, u8, u8) {
let y = self.0 >> 9;
let m = (self.0 >> 5) & 0xF;
let d = self.0 & 0x1F;
(y as u16, m as u8, d as u8)
}
/// Returns `true` if `self` occurs on or after `date`.
///
/// If `date` occurs before `self`, or if `date` is not in `%Y-%m-%d`
/// format, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// let date = Date::parse("2020-01-01").unwrap();
///
/// assert!(date.at_least("2019-12-31"));
/// assert!(date.at_least("2020-01-01"));
/// assert!(date.at_least("2014-04-31"));
///
/// assert!(!date.at_least("2020-01-02"));
/// assert!(!date.at_least("2024-08-18"));
/// ```
pub fn at_least(&self, date: &str) -> bool {
Date::parse(date)
.map(|date| self >= &date)
.unwrap_or(false)
}
/// Returns `true` if `self` occurs on or before `date`.
///
/// If `date` occurs after `self`, or if `date` is not in `%Y-%m-%d`
/// format, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// let date = Date::parse("2020-01-01").unwrap();
///
/// assert!(date.at_most("2020-01-01"));
/// assert!(date.at_most("2020-01-02"));
/// assert!(date.at_most("2024-08-18"));
///
/// assert!(!date.at_most("2019-12-31"));
/// assert!(!date.at_most("2014-04-31"));
/// ```
pub fn at_most(&self, date: &str) -> bool {
Date::parse(date)
.map(|date| self <= &date)
.unwrap_or(false)
}
/// Returns `true` if `self` occurs exactly on `date`.
///
/// If `date` is not exactly `self`, or if `date` is not in `%Y-%m-%d`
/// format, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Date;
///
/// let date = Date::parse("2020-01-01").unwrap();
///
/// assert!(date.exactly("2020-01-01"));
///
/// assert!(!date.exactly("2019-12-31"));
/// assert!(!date.exactly("2014-04-31"));
/// assert!(!date.exactly("2020-01-02"));
/// assert!(!date.exactly("2024-08-18"));
/// ```
pub fn exactly(&self, date: &str) -> bool {
Date::parse(date)
.map(|date| self == &date)
.unwrap_or(false)
}
}
impl fmt::Display for Date {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let (y, m, d) = self.to_ymd();
write!(f, "{}-{:02}-{:02}", y, m, d)
}
}
#[cfg(test)]
mod tests {
use super::Date;
macro_rules! reflexive_display {
($string:expr) => (
assert_eq!(Date::parse($string).unwrap().to_string(), $string);
)
}
#[test]
fn display() {
reflexive_display!("2019-05-08");
reflexive_display!("2000-01-01");
reflexive_display!("2000-12-31");
reflexive_display!("2090-12-31");
reflexive_display!("1999-02-19");
reflexive_display!("9999-12-31");
}
}

493
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@@ -0,0 +1,493 @@
//! This tiny crate checks that the running or installed `rustc` meets some
//! version requirements. The version is queried by calling the Rust compiler
//! with `--version`. The path to the compiler is determined first via the
//! `RUSTC` environment variable. If it is not set, then `rustc` is used. If
//! that fails, no determination is made, and calls return `None`.
//!
//! # Examples
//!
//! * Set a `cfg` flag in `build.rs` if the running compiler was determined to
//! be at least version `1.13.0`:
//!
//! ```rust
//! extern crate version_check as rustc;
//!
//! if rustc::is_min_version("1.13.0").unwrap_or(false) {
//! println!("cargo:rustc-cfg=question_mark_operator");
//! }
//! ```
//!
//! See [`is_max_version`] or [`is_exact_version`] to check if the compiler
//! is _at most_ or _exactly_ a certain version.
//!
//! * Check that the running compiler was released on or after `2018-12-18`:
//!
//! ```rust
//! extern crate version_check as rustc;
//!
//! match rustc::is_min_date("2018-12-18") {
//! Some(true) => "Yep! It's recent!",
//! Some(false) => "No, it's older.",
//! None => "Couldn't determine the rustc version."
//! };
//! ```
//!
//! See [`is_max_date`] or [`is_exact_date`] to check if the compiler was
//! released _prior to_ or _exactly on_ a certain date.
//!
//! * Check that the running compiler supports feature flags:
//!
//! ```rust
//! extern crate version_check as rustc;
//!
//! match rustc::is_feature_flaggable() {
//! Some(true) => "Yes! It's a dev or nightly release!",
//! Some(false) => "No, it's stable or beta.",
//! None => "Couldn't determine the rustc version."
//! };
//! ```
//!
//! * Check that the running compiler supports a specific feature:
//!
//! ```rust
//! extern crate version_check as rustc;
//!
//! if let Some(true) = rustc::supports_feature("doc_cfg") {
//! println!("cargo:rustc-cfg=has_doc_cfg");
//! }
//! ```
//!
//! * Check that the running compiler is on the stable channel:
//!
//! ```rust
//! extern crate version_check as rustc;
//!
//! match rustc::Channel::read() {
//! Some(c) if c.is_stable() => format!("Yes! It's stable."),
//! Some(c) => format!("No, the channel {} is not stable.", c),
//! None => format!("Couldn't determine the rustc version.")
//! };
//! ```
//!
//! To interact with the version, release date, and release channel as structs,
//! use [`Version`], [`Date`], and [`Channel`], respectively. The [`triple()`]
//! function returns all three values efficiently.
//!
//! # Alternatives
//!
//! This crate is dead simple with no dependencies. If you need something more
//! and don't care about panicking if the version cannot be obtained, or if you
//! don't mind adding dependencies, see
//! [rustc_version](https://crates.io/crates/rustc_version).
#![allow(deprecated)]
mod version;
mod channel;
mod date;
use std::env;
use std::process::Command;
#[doc(inline)] pub use version::*;
#[doc(inline)] pub use channel::*;
#[doc(inline)] pub use date::*;
/// Parses (version, date) as available from rustc version string.
fn version_and_date_from_rustc_version(s: &str) -> (Option<String>, Option<String>) {
let last_line = s.lines().last().unwrap_or(s);
let mut components = last_line.trim().split(" ");
let version = components.nth(1);
let date = components.filter(|c| c.ends_with(')')).next()
.map(|s| s.trim_right().trim_right_matches(")").trim_left().trim_left_matches('('));
(version.map(|s| s.to_string()), date.map(|s| s.to_string()))
}
/// Parses (version, date) as available from rustc verbose version output.
fn version_and_date_from_rustc_verbose_version(s: &str) -> (Option<String>, Option<String>) {
let (mut version, mut date) = (None, None);
for line in s.lines() {
let split = |s: &str| s.splitn(2, ":").nth(1).map(|s| s.trim().to_string());
match line.trim().split(" ").nth(0) {
Some("rustc") => {
let (v, d) = version_and_date_from_rustc_version(line);
version = version.or(v);
date = date.or(d);
},
Some("release:") => version = split(line),
Some("commit-date:") if line.ends_with("unknown") => date = None,
Some("commit-date:") => date = split(line),
_ => continue
}
}
(version, date)
}
/// Returns (version, date) as available from `rustc --version`.
fn get_version_and_date() -> Option<(Option<String>, Option<String>)> {
let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
Command::new(rustc).arg("--verbose").arg("--version").output().ok()
.and_then(|output| String::from_utf8(output.stdout).ok())
.map(|s| version_and_date_from_rustc_verbose_version(&s))
}
/// Reads the triple of [`Version`], [`Channel`], and [`Date`] of the installed
/// or running `rustc`.
///
/// If any attribute cannot be determined (see the [top-level
/// documentation](crate)), returns `None`.
///
/// To obtain only one of three attributes, use [`Version::read()`],
/// [`Channel::read()`], or [`Date::read()`].
pub fn triple() -> Option<(Version, Channel, Date)> {
let (version_str, date_str) = match get_version_and_date() {
Some((Some(version), Some(date))) => (version, date),
_ => return None
};
// Can't use `?` or `try!` for `Option` in 1.0.0.
match Version::parse(&version_str) {
Some(version) => match Channel::parse(&version_str) {
Some(channel) => match Date::parse(&date_str) {
Some(date) => Some((version, channel, date)),
_ => None,
},
_ => None,
},
_ => None
}
}
/// Checks that the running or installed `rustc` was released **on or after**
/// some date.
///
/// The format of `min_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
/// `2017-01-09`.
///
/// If the date cannot be retrieved or parsed, or if `min_date` could not be
/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
/// was release on or after `min_date` and `false` otherwise.
pub fn is_min_date(min_date: &str) -> Option<bool> {
match (Date::read(), Date::parse(min_date)) {
(Some(rustc_date), Some(min_date)) => Some(rustc_date >= min_date),
_ => None
}
}
/// Checks that the running or installed `rustc` was released **on or before**
/// some date.
///
/// The format of `max_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
/// `2017-01-09`.
///
/// If the date cannot be retrieved or parsed, or if `max_date` could not be
/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
/// was release on or before `max_date` and `false` otherwise.
pub fn is_max_date(max_date: &str) -> Option<bool> {
match (Date::read(), Date::parse(max_date)) {
(Some(rustc_date), Some(max_date)) => Some(rustc_date <= max_date),
_ => None
}
}
/// Checks that the running or installed `rustc` was released **exactly** on
/// some date.
///
/// The format of `date` must be YYYY-MM-DD. For instance: `2016-12-20` or
/// `2017-01-09`.
///
/// If the date cannot be retrieved or parsed, or if `date` could not be parsed,
/// returns `None`. Otherwise returns `true` if the installed `rustc` was
/// release on `date` and `false` otherwise.
pub fn is_exact_date(date: &str) -> Option<bool> {
match (Date::read(), Date::parse(date)) {
(Some(rustc_date), Some(date)) => Some(rustc_date == date),
_ => None
}
}
/// Checks that the running or installed `rustc` is **at least** some minimum
/// version.
///
/// The format of `min_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
/// `1.14.0`, `1.16.0-nightly`, etc.
///
/// If the version cannot be retrieved or parsed, or if `min_version` could not
/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
/// is at least `min_version` and `false` otherwise.
pub fn is_min_version(min_version: &str) -> Option<bool> {
match (Version::read(), Version::parse(min_version)) {
(Some(rustc_ver), Some(min_ver)) => Some(rustc_ver >= min_ver),
_ => None
}
}
/// Checks that the running or installed `rustc` is **at most** some maximum
/// version.
///
/// The format of `max_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
/// `1.14.0`, `1.16.0-nightly`, etc.
///
/// If the version cannot be retrieved or parsed, or if `max_version` could not
/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
/// is at most `max_version` and `false` otherwise.
pub fn is_max_version(max_version: &str) -> Option<bool> {
match (Version::read(), Version::parse(max_version)) {
(Some(rustc_ver), Some(max_ver)) => Some(rustc_ver <= max_ver),
_ => None
}
}
/// Checks that the running or installed `rustc` is **exactly** some version.
///
/// The format of `version` is a semantic version: `1.3.0`, `1.15.0-beta`,
/// `1.14.0`, `1.16.0-nightly`, etc.
///
/// If the version cannot be retrieved or parsed, or if `version` could not be
/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc` is
/// exactly `version` and `false` otherwise.
pub fn is_exact_version(version: &str) -> Option<bool> {
match (Version::read(), Version::parse(version)) {
(Some(rustc_ver), Some(version)) => Some(rustc_ver == version),
_ => None
}
}
/// Checks whether the running or installed `rustc` supports feature flags.
///
/// In other words, if the channel is either "nightly" or "dev".
///
/// Note that support for specific `rustc` features can be enabled or disabled
/// via the `allow-features` compiler flag, which this function _does not_
/// check. That is, this function _does not_ check whether a _specific_ feature
/// is supported, but instead whether features are supported at all. To check
/// for support for a specific feature, use [`supports_feature()`].
///
/// If the version could not be determined, returns `None`. Otherwise returns
/// `true` if the running version supports feature flags and `false` otherwise.
pub fn is_feature_flaggable() -> Option<bool> {
Channel::read().map(|c| c.supports_features())
}
/// Checks whether the running or installed `rustc` supports `feature`.
///
/// Returns _true_ _iff_ [`is_feature_flaggable()`] returns `true` _and_ the
/// feature is not disabled via exclusion in `allow-features` via `RUSTFLAGS` or
/// `CARGO_ENCODED_RUSTFLAGS`. If the version could not be determined, returns
/// `None`.
///
/// # Example
///
/// ```rust
/// use version_check as rustc;
///
/// if let Some(true) = rustc::supports_feature("doc_cfg") {
/// println!("cargo:rustc-cfg=has_doc_cfg");
/// }
/// ```
pub fn supports_feature(feature: &str) -> Option<bool> {
match is_feature_flaggable() {
Some(true) => { /* continue */ }
Some(false) => return Some(false),
None => return None,
}
let env_flags = env::var_os("CARGO_ENCODED_RUSTFLAGS")
.map(|flags| (flags, '\x1f'))
.or_else(|| env::var_os("RUSTFLAGS").map(|flags| (flags, ' ')));
if let Some((flags, delim)) = env_flags {
const ALLOW_FEATURES: &'static str = "allow-features=";
let rustflags = flags.to_string_lossy();
let allow_features = rustflags.split(delim)
.map(|flag| flag.trim_left_matches("-Z").trim())
.filter(|flag| flag.starts_with(ALLOW_FEATURES))
.map(|flag| &flag[ALLOW_FEATURES.len()..]);
if let Some(allow_features) = allow_features.last() {
return Some(allow_features.split(',').any(|f| f.trim() == feature));
}
}
// If there are no `RUSTFLAGS` or `CARGO_ENCODED_RUSTFLAGS` or they don't
// contain an `allow-features` flag, assume compiler allows all features.
Some(true)
}
#[cfg(test)]
mod tests {
use std::{env, fs};
use super::version_and_date_from_rustc_version;
use super::version_and_date_from_rustc_verbose_version;
macro_rules! check_parse {
(@ $f:expr, $s:expr => $v:expr, $d:expr) => ({
if let (Some(v), d) = $f(&$s) {
let e_d: Option<&str> = $d.into();
assert_eq!((v, d), ($v.to_string(), e_d.map(|s| s.into())));
} else {
panic!("{:?} didn't parse for version testing.", $s);
}
});
($f:expr, $s:expr => $v:expr, $d:expr) => ({
let warn = "warning: invalid logging spec 'warning', ignoring it";
let warn2 = "warning: sorry, something went wrong :(sad)";
check_parse!(@ $f, $s => $v, $d);
check_parse!(@ $f, &format!("{}\n{}", warn, $s) => $v, $d);
check_parse!(@ $f, &format!("{}\n{}", warn2, $s) => $v, $d);
check_parse!(@ $f, &format!("{}\n{}\n{}", warn, warn2, $s) => $v, $d);
check_parse!(@ $f, &format!("{}\n{}\n{}", warn2, warn, $s) => $v, $d);
})
}
macro_rules! check_terse_parse {
($($s:expr => $v:expr, $d:expr,)+) => {$(
check_parse!(version_and_date_from_rustc_version, $s => $v, $d);
)+}
}
macro_rules! check_verbose_parse {
($($s:expr => $v:expr, $d:expr,)+) => {$(
check_parse!(version_and_date_from_rustc_verbose_version, $s => $v, $d);
)+}
}
#[test]
fn test_version_parse() {
check_terse_parse! {
"rustc 1.18.0" => "1.18.0", None,
"rustc 1.8.0" => "1.8.0", None,
"rustc 1.20.0-nightly" => "1.20.0-nightly", None,
"rustc 1.20" => "1.20", None,
"rustc 1.3" => "1.3", None,
"rustc 1" => "1", None,
"rustc 1.5.1-beta" => "1.5.1-beta", None,
"rustc 1.20.0 (2017-07-09)" => "1.20.0", Some("2017-07-09"),
"rustc 1.20.0-dev (2017-07-09)" => "1.20.0-dev", Some("2017-07-09"),
"rustc 1.20.0-nightly (d84693b93 2017-07-09)" => "1.20.0-nightly", Some("2017-07-09"),
"rustc 1.20.0 (d84693b93 2017-07-09)" => "1.20.0", Some("2017-07-09"),
"rustc 1.30.0-nightly (3bc2ca7e4 2018-09-20)" => "1.30.0-nightly", Some("2018-09-20"),
};
}
#[test]
fn test_verbose_version_parse() {
check_verbose_parse! {
"rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
binary: rustc\n\
commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
commit-date: 2015-05-13\n\
build-date: 2015-05-14\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.0.0" => "1.0.0", Some("2015-05-13"),
"rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
commit-date: 2015-05-13\n\
build-date: 2015-05-14\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.0.0" => "1.0.0", Some("2015-05-13"),
"rustc 1.50.0 (cb75ad5db 2021-02-10)\n\
binary: rustc\n\
commit-hash: cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\n\
commit-date: 2021-02-10\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.50.0" => "1.50.0", Some("2021-02-10"),
"rustc 1.52.0-nightly (234781afe 2021-03-07)\n\
binary: rustc\n\
commit-hash: 234781afe33d3f339b002f85f948046d8476cfc9\n\
commit-date: 2021-03-07\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.52.0-nightly\n\
LLVM version: 12.0.0" => "1.52.0-nightly", Some("2021-03-07"),
"rustc 1.41.1\n\
binary: rustc\n\
commit-hash: unknown\n\
commit-date: unknown\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.41.1\n\
LLVM version: 7.0" => "1.41.1", None,
"rustc 1.49.0\n\
binary: rustc\n\
commit-hash: unknown\n\
commit-date: unknown\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.49.0" => "1.49.0", None,
"rustc 1.50.0 (Fedora 1.50.0-1.fc33)\n\
binary: rustc\n\
commit-hash: unknown\n\
commit-date: unknown\n\
host: x86_64-unknown-linux-gnu\n\
release: 1.50.0" => "1.50.0", None,
};
}
fn read_static(verbose: bool, channel: &str, minor: usize) -> String {
use std::fs::File;
use std::path::Path;
use std::io::{BufReader, Read};
let subdir = if verbose { "verbose" } else { "terse" };
let path = Path::new(STATIC_PATH)
.join(channel)
.join(subdir)
.join(format!("rustc-1.{}.0", minor));
let file = File::open(path).unwrap();
let mut buf_reader = BufReader::new(file);
let mut contents = String::new();
buf_reader.read_to_string(&mut contents).unwrap();
contents
}
static STATIC_PATH: &'static str = concat!(env!("CARGO_MANIFEST_DIR"), "/static");
static DATES: [&'static str; 51] = [
"2015-05-13", "2015-06-19", "2015-08-03", "2015-09-15", "2015-10-27",
"2015-12-04", "2016-01-19", "2016-02-29", "2016-04-11", "2016-05-18",
"2016-07-03", "2016-08-15", "2016-09-23", "2016-11-07", "2016-12-16",
"2017-01-19", "2017-03-10", "2017-04-24", "2017-06-06", "2017-07-17",
"2017-08-27", "2017-10-09", "2017-11-20", "2018-01-01", "2018-02-12",
"2018-03-25", "2018-05-07", "2018-06-19", "2018-07-30", "2018-09-11",
"2018-10-24", "2018-12-04", "2019-01-16", "2019-02-28", "2019-04-10",
"2019-05-20", "2019-07-03", "2019-08-13", "2019-09-23", "2019-11-04",
"2019-12-16", "2020-01-27", "2020-03-09", "2020-04-20", "2020-06-01",
"2020-07-13", "2020-08-24", "2020-10-07", "2020-11-16", "2020-12-29",
"2021-02-10",
];
#[test]
fn test_stable_compatibility() {
if env::var_os("FORCE_STATIC").is_none() && fs::metadata(STATIC_PATH).is_err() {
// We exclude `/static` when we package `version_check`, so don't
// run if static files aren't present unless we know they should be.
return;
}
// Ensure we can parse all output from all Linux stable releases.
for v in 0..DATES.len() {
let (version, date) = (&format!("1.{}.0", v), Some(DATES[v]));
check_terse_parse!(read_static(false, "stable", v) => version, date,);
check_verbose_parse!(read_static(true, "stable", v) => version, date,);
}
}
#[test]
fn test_parse_current() {
let (version, channel) = (::Version::read(), ::Channel::read());
assert!(version.is_some());
assert!(channel.is_some());
if let Ok(known_channel) = env::var("KNOWN_CHANNEL") {
assert_eq!(channel, ::Channel::parse(&known_channel));
}
}
}

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use std::fmt;
/// Version number: `major.minor.patch`, ignoring release channel.
#[derive(PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
pub struct Version(u64);
impl Version {
/// Reads the version of the running compiler. If it cannot be determined
/// (see the [top-level documentation](crate)), returns `None`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// match Version::read() {
/// Some(d) => format!("Version is: {}", d),
/// None => format!("Failed to read the version.")
/// };
/// ```
pub fn read() -> Option<Version> {
::get_version_and_date()
.and_then(|(version, _)| version)
.and_then(|version| Version::parse(&version))
}
/// Parse a Rust release version (of the form
/// `major[.minor[.patch[-channel]]]`), ignoring the release channel, if
/// any. Returns `None` if `version` is not a valid Rust version string.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.18.0").unwrap();
/// assert!(version.exactly("1.18.0"));
///
/// let version = Version::parse("1.20.0-nightly").unwrap();
/// assert!(version.exactly("1.20.0"));
/// assert!(version.exactly("1.20.0-beta"));
///
/// let version = Version::parse("1.3").unwrap();
/// assert!(version.exactly("1.3.0"));
///
/// let version = Version::parse("1").unwrap();
/// assert!(version.exactly("1.0.0"));
///
/// assert!(Version::parse("one.two.three").is_none());
/// assert!(Version::parse("1.65536.2").is_none());
/// assert!(Version::parse("1. 2").is_none());
/// assert!(Version::parse("").is_none());
/// assert!(Version::parse("1.").is_none());
/// assert!(Version::parse("1.2.3.4").is_none());
/// ```
pub fn parse(version: &str) -> Option<Version> {
let splits = version.split('-')
.nth(0)
.unwrap_or("")
.split('.')
.map(|s| s.parse::<u16>());
let mut mmp = [0u16; 3];
for (i, split) in splits.enumerate() {
mmp[i] = match (i, split) {
(3, _) | (_, Err(_)) => return None,
(_, Ok(v)) => v,
};
}
let (maj, min, patch) = (mmp[0], mmp[1], mmp[2]);
Some(Version::from_mmp(maj, min, patch))
}
/// Creates a `Version` from `(major, minor, patch)` version components.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// assert!(Version::from_mmp(1, 35, 0).exactly("1.35.0"));
/// assert!(Version::from_mmp(1, 33, 0).exactly("1.33.0"));
/// assert!(Version::from_mmp(1, 35, 1).exactly("1.35.1"));
/// assert!(Version::from_mmp(1, 13, 2).exactly("1.13.2"));
/// ```
pub fn from_mmp(major: u16, minor: u16, patch: u16) -> Version {
Version(((major as u64) << 32) | ((minor as u64) << 16) | patch as u64)
}
/// Returns the `(major, minor, patch)` version components of `self`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// assert_eq!(Version::parse("1.35.0").unwrap().to_mmp(), (1, 35, 0));
/// assert_eq!(Version::parse("1.33.0").unwrap().to_mmp(), (1, 33, 0));
/// assert_eq!(Version::parse("1.35.1").unwrap().to_mmp(), (1, 35, 1));
/// assert_eq!(Version::parse("1.13.2").unwrap().to_mmp(), (1, 13, 2));
/// ```
pub fn to_mmp(&self) -> (u16, u16, u16) {
let major = self.0 >> 32;
let minor = self.0 >> 16;
let patch = self.0;
(major as u16, minor as u16, patch as u16)
}
/// Returns `true` if `self` is greater than or equal to `version`.
///
/// If `version` is greater than `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.at_least("1.33.0"));
/// assert!(version.at_least("1.35.0"));
/// assert!(version.at_least("1.13.2"));
///
/// assert!(!version.at_least("1.35.1"));
/// assert!(!version.at_least("1.55.0"));
///
/// let version = Version::parse("1.12.5").unwrap();
///
/// assert!(version.at_least("1.12.0"));
/// assert!(!version.at_least("1.35.0"));
/// ```
pub fn at_least(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self >= &version)
.unwrap_or(false)
}
/// Returns `true` if `self` is less than or equal to `version`.
///
/// If `version` is less than `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.at_most("1.35.1"));
/// assert!(version.at_most("1.55.0"));
/// assert!(version.at_most("1.35.0"));
///
/// assert!(!version.at_most("1.33.0"));
/// assert!(!version.at_most("1.13.2"));
/// ```
pub fn at_most(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self <= &version)
.unwrap_or(false)
}
/// Returns `true` if `self` is exactly equal to `version`.
///
/// If `version` is not equal to `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.exactly("1.35.0"));
///
/// assert!(!version.exactly("1.33.0"));
/// assert!(!version.exactly("1.35.1"));
/// assert!(!version.exactly("1.13.2"));
/// ```
pub fn exactly(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self == &version)
.unwrap_or(false)
}
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let (major, minor, patch) = self.to_mmp();
write!(f, "{}.{}.{}", major, minor, patch)
}
}
impl fmt::Debug for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// We don't use `debug_*` because it's not available in `1.0.0`.
write!(f, "Version({:?}, {:?})", self.0, self.to_mmp())
}
}
#[cfg(test)]
mod tests {
use super::Version;
macro_rules! assert_to_mmp {
// We don't use `.into::<Option<_>>` because it's not available in 1.0.
// We don't use the message part of `assert!` for the same reason.
($s:expr, None) => (
assert_eq!(Version::parse($s), None);
);
($s:expr, $mmp:expr) => (
assert_eq!(Version::parse($s).map(|v| v.to_mmp()), Some($mmp));
)
}
macro_rules! assert_from_mmp {
(($x:expr, $y:expr, $z:expr) => $s:expr) => {
assert_eq!(Some(Version::from_mmp($x, $y, $z)), Version::parse($s));
};
}
#[test]
fn test_str_to_mmp() {
assert_to_mmp!("1", (1, 0, 0));
assert_to_mmp!("1.2", (1, 2, 0));
assert_to_mmp!("1.18.0", (1, 18, 0));
assert_to_mmp!("3.19.0", (3, 19, 0));
assert_to_mmp!("1.19.0-nightly", (1, 19, 0));
assert_to_mmp!("1.12.2349", (1, 12, 2349));
assert_to_mmp!("0.12", (0, 12, 0));
assert_to_mmp!("1.12.5", (1, 12, 5));
assert_to_mmp!("1.12", (1, 12, 0));
assert_to_mmp!("1", (1, 0, 0));
assert_to_mmp!("1.4.4-nightly (d84693b93 2017-07-09))", (1, 4, 4));
assert_to_mmp!("1.58879.4478-dev", (1, 58879, 4478));
assert_to_mmp!("1.58879.4478-dev (d84693b93 2017-07-09))", (1, 58879, 4478));
}
#[test]
fn test_malformed() {
assert_to_mmp!("1.65536.2", None);
assert_to_mmp!("-1.2.3", None);
assert_to_mmp!("1. 2", None);
assert_to_mmp!("", None);
assert_to_mmp!(" ", None);
assert_to_mmp!(".", None);
assert_to_mmp!("one", None);
assert_to_mmp!("1.", None);
assert_to_mmp!("1.2.3.4.5.6", None);
}
#[test]
fn test_from_mmp() {
assert_from_mmp!((1, 18, 0) => "1.18.0");
assert_from_mmp!((3, 19, 0) => "3.19.0");
assert_from_mmp!((1, 19, 0) => "1.19.0");
assert_from_mmp!((1, 12, 2349) => "1.12.2349");
assert_from_mmp!((0, 12, 0) => "0.12");
assert_from_mmp!((1, 12, 5) => "1.12.5");
assert_from_mmp!((1, 12, 0) => "1.12");
assert_from_mmp!((1, 0, 0) => "1");
assert_from_mmp!((1, 4, 4) => "1.4.4");
assert_from_mmp!((1, 58879, 4478) => "1.58879.4478");
}
#[test]
fn test_comparisons() {
let version = Version::parse("1.18.0").unwrap();
assert!(version.exactly("1.18.0"));
assert!(version.at_least("1.12.0"));
assert!(version.at_least("1.12"));
assert!(version.at_least("1"));
assert!(version.at_most("1.18.1"));
assert!(!version.exactly("1.19.0"));
assert!(!version.exactly("1.18.1"));
let version = Version::parse("1.20.0-nightly").unwrap();
assert!(version.exactly("1.20.0-beta"));
assert!(version.exactly("1.20.0-nightly"));
assert!(version.exactly("1.20.0"));
assert!(!version.exactly("1.19"));
let version = Version::parse("1.3").unwrap();
assert!(version.exactly("1.3.0"));
assert!(version.exactly("1.3.0-stable"));
assert!(version.exactly("1.3"));
assert!(!version.exactly("1.5.0-stable"));
let version = Version::parse("1").unwrap();
assert!(version.exactly("1.0.0"));
assert!(version.exactly("1.0"));
assert!(version.exactly("1"));
assert!(Version::parse("one.two.three").is_none());
}
macro_rules! reflexive_display {
($s:expr) => (
assert_eq!(Version::parse($s).unwrap().to_string(), $s);
)
}
#[test]
fn display() {
reflexive_display!("1.0.0");
reflexive_display!("1.2.3");
reflexive_display!("1.12.1438");
reflexive_display!("1.44.0");
reflexive_display!("2.44.0");
reflexive_display!("23459.28923.3483");
}
}