browserslist/queries/
last_n_major_browsers.rsuse super::{count_android_filter, should_filter_android, Distrib, QueryResult};
use crate::{
data::caniuse::{get_browser_stat, CANIUSE_BROWSERS},
opts::Opts,
};
use itertools::Itertools;
pub(super) fn last_n_major_browsers(count: usize, opts: &Opts) -> QueryResult {
let distribs = CANIUSE_BROWSERS
.keys()
.filter_map(|name| get_browser_stat(name, opts.mobile_to_desktop))
.flat_map(|(name, stat)| {
let count = if should_filter_android(name, opts.mobile_to_desktop) {
count_android_filter(count, opts.mobile_to_desktop)
} else {
count
};
let minimum: u32 = stat
.version_list
.iter()
.filter(|version| version.release_date.is_some())
.rev()
.map(|version| version.version.split('.').next().unwrap())
.dedup()
.nth(count - 1)
.and_then(|minimum| minimum.parse().ok())
.unwrap_or(0);
stat.version_list
.iter()
.filter(|version| version.release_date.is_some())
.map(|version| &*version.version)
.filter(move |version| {
version.split('.').next().unwrap().parse().unwrap_or(0) >= minimum
})
.rev()
.map(move |version| Distrib::new(name, version))
})
.collect();
Ok(distribs)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test::run_compare;
use test_case::test_case;
#[test_case("last 2 major versions"; "basic")]
#[test_case("last 1 major version"; "support pluralization")]
#[test_case("Last 01 MaJoR Version"; "case insensitive")]
fn valid(query: &str) {
run_compare(query, &Opts::new());
}
}