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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
// A sample application which takes a comma separated list of language identifiers,
// filters out identifiers with language subtags different than `en` and serializes
// the list back into a comma separated list in canonical syntax.
//
// Note: This is an example of the API use, and is not a good base for language matching.
// For language matching, please consider algorithms such as Locale Matcher.
#![no_main] // https://github.com/unicode-org/icu4x/issues/395
icu_benchmark_macros::static_setup!();
use std::env;
use icu_locid::{subtags, LanguageIdentifier};
const DEFAULT_INPUT: &str =
"de, en-us, zh-hant, sr-cyrl, fr-ca, es-cl, pl, en-latn-us, ca-valencia, und-arab";
fn filter_input(input: &str) -> String {
// 1. Parse the input string into a list of language identifiers.
let langids = input.split(',').filter_map(|s| s.trim().parse().ok());
// 2. Filter for LanguageIdentifiers with Language subtag `en`.
let en_lang: subtags::Language = "en".parse().expect("Failed to parse language subtag.");
let en_langids = langids.filter(|langid: &LanguageIdentifier| langid.language == en_lang);
// 3. Serialize the output.
let en_strs: Vec<String> = en_langids.map(|langid| langid.to_string()).collect();
en_strs.join(", ")
}
#[no_mangle]
fn main(_argc: isize, _argv: *const *const u8) -> isize {
icu_benchmark_macros::main_setup!();
let args: Vec<String> = env::args().collect();
let input = if let Some(input) = args.get(1) {
input.as_str()
} else {
DEFAULT_INPUT
};
let _output = filter_input(input);
#[cfg(debug_assertions)]
println!("\nInput: {}\nOutput: {}", input, _output);
0
}
#[cfg(test)]
mod tests {
use super::*;
const DEFAULT_OUTPUT: &str = "en-US, en-Latn-US";
#[test]
fn ensure_default_output() {
assert_eq!(filter_input(DEFAULT_INPUT), DEFAULT_OUTPUT);
}
}
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