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|
use self::Channel::*;
use std::fmt::{self, Debug};
pub enum ParseResult {
Success(Version),
OopsClippy,
Unrecognized,
}
#[cfg_attr(test, derive(PartialEq))]
pub struct Version {
pub minor: u16,
pub patch: u16,
pub channel: Channel,
}
#[cfg_attr(test, derive(PartialEq))]
pub enum Channel {
Stable,
Beta,
Nightly(Date),
Dev,
}
#[cfg_attr(test, derive(PartialEq))]
pub struct Date {
pub year: u16,
pub month: u8,
pub day: u8,
}
pub fn parse(string: &str) -> ParseResult {
let last_line = string.lines().last().unwrap_or(string);
let mut words = last_line.trim().split(' ');
match words.next() {
Some("rustc") => {}
Some(word) if word.starts_with("clippy") => return ParseResult::OopsClippy,
Some(_) | None => return ParseResult::Unrecognized,
}
parse_words(&mut words).map_or(ParseResult::Unrecognized, ParseResult::Success)
}
fn parse_words(words: &mut dyn Iterator<Item = &str>) -> Option<Version> {
let mut version_channel = words.next()?.split('-');
let version = version_channel.next()?;
let channel = version_channel.next();
let mut digits = version.split('.');
let major = digits.next()?;
if major != "1" {
return None;
}
let minor = digits.next()?.parse().ok()?;
let patch = digits.next().unwrap_or("0").parse().ok()?;
let channel = match channel {
None => Stable,
Some(channel) if channel == "dev" => Dev,
Some(channel) if channel.starts_with("beta") => Beta,
Some(channel) if channel == "nightly" => match words.next() {
Some(hash) if hash.starts_with('(') => match words.next() {
None if hash.ends_with(')') => Dev,
Some(date) if date.ends_with(')') => {
let mut date = date[..date.len() - 1].split('-');
let year = date.next()?.parse().ok()?;
let month = date.next()?.parse().ok()?;
let day = date.next()?.parse().ok()?;
match date.next() {
None => Nightly(Date { year, month, day }),
Some(_) => return None,
}
}
None | Some(_) => return None,
},
Some(_) => return None,
None => Dev,
},
Some(_) => return None,
};
Some(Version {
minor,
patch,
channel,
})
}
impl Debug for Version {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter
.debug_struct("crate::version::Version")
.field("minor", &self.minor)
.field("patch", &self.patch)
.field("channel", &self.channel)
.finish()
}
}
impl Debug for Channel {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match self {
Channel::Stable => formatter.write_str("crate::version::Channel::Stable"),
Channel::Beta => formatter.write_str("crate::version::Channel::Beta"),
Channel::Nightly(date) => formatter
.debug_tuple("crate::version::Channel::Nightly")
.field(date)
.finish(),
Channel::Dev => formatter.write_str("crate::version::Channel::Dev"),
}
}
}
impl Debug for Date {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter
.debug_struct("crate::date::Date")
.field("year", &self.year)
.field("month", &self.month)
.field("day", &self.day)
.finish()
}
}
|
