1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
// 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 macro allowing for compile-time construction of valid [`LanguageIdentifier`]s.
///
/// The macro will perform syntax canonicalization of the tag.
///
/// # Examples
///
/// ```
/// use icu::locid::{langid, LanguageIdentifier};
///
/// const DE_AT: LanguageIdentifier = langid!("de_at");
///
/// let de_at: LanguageIdentifier = "de_at".parse().unwrap();
///
/// assert_eq!(DE_AT, de_at);
/// ```
///
/// *Note*: The macro cannot produce language identifiers with more than one variants due to const
/// limitations (see [`Heap Allocations in Constants`]):
///
/// ```compile_fail,E0080
/// icu::locid::langid!("und-variant1-variant2");
/// ```
///
/// Use runtime parsing instead:
/// ```
/// "und-variant1-variant2"
/// .parse::<icu::locid::LanguageIdentifier>()
/// .unwrap();
/// ```
///
/// [`LanguageIdentifier`]: crate::LanguageIdentifier
/// [`Heap Allocations in Constants`]: https://github.com/rust-lang/const-eval/issues/20
#[macro_export]
macro_rules! langid {
($langid:literal) => {{
const R: $crate::LanguageIdentifier =
match $crate::LanguageIdentifier::try_from_bytes_with_single_variant($langid.as_bytes()) {
Ok((language, script, region, variant)) => $crate::LanguageIdentifier {
language,
script,
region,
variants: match variant {
Some(v) => $crate::subtags::Variants::from_variant(v),
None => $crate::subtags::Variants::new(),
}
},
#[allow(clippy::panic)] // const context
_ => panic!(concat!("Invalid language code: ", $langid, " . Note langid! macro can only support up to a single variant tag. Use runtime parsing instead.")),
};
R
}};
}
/// A macro allowing for compile-time construction of valid [`Locale`]s.
///
/// The macro will perform syntax canonicalization of the tag.
///
/// # Examples
///
/// ```
/// use icu::locid::{locale, Locale};
///
/// const DE_AT: Locale = locale!("de_at");
///
/// let de_at: Locale = "de_at".parse().unwrap();
///
/// assert_eq!(DE_AT, de_at);
/// ```
///
/// *Note*: The macro cannot produce locales with more than one variant or multiple extensions
/// (only single keyword unicode extension is supported) due to const
/// limitations (see [`Heap Allocations in Constants`]):
///
/// ```compile_fail,E0080
/// icu::locid::locale!("sl-IT-rozaj-biske-1994");
/// ```
/// Use runtime parsing instead:
/// ```
/// "sl-IT-rozaj-biske-1994"
/// .parse::<icu::locid::Locale>()
/// .unwrap();
/// ```
///
/// Locales with multiple keys are not supported
/// ```compile_fail,E0080
/// icu::locid::locale!("th-TH-u-ca-buddhist-nu-thai");
/// ```
/// Use runtime parsing instead:
/// ```
/// "th-TH-u-ca-buddhist-nu-thai"
/// .parse::<icu::locid::Locale>()
/// .unwrap();
/// ```
///
/// Locales with attributes are not supported
/// ```compile_fail,E0080
/// icu::locid::locale!("en-US-u-foobar-ca-buddhist");
/// ```
/// Use runtime parsing instead:
/// ```
/// "en-US-u-foobar-ca-buddhist"
/// .parse::<icu::locid::Locale>()
/// .unwrap();
/// ```
///
/// Locales with single key but multiple types are not supported
/// ```compile_fail,E0080
/// icu::locid::locale!("en-US-u-ca-islamic-umalqura");
/// ```
/// Use runtime parsing instead:
/// ```
/// "en-US-u-ca-islamic-umalqura"
/// .parse::<icu::locid::Locale>()
/// .unwrap();
/// ```
/// [`Locale`]: crate::Locale
/// [`Heap Allocations in Constants`]: https://github.com/rust-lang/const-eval/issues/20
#[macro_export]
macro_rules! locale {
($locale:literal) => {{
const R: $crate::Locale =
match $crate::Locale::try_from_bytes_with_single_variant_single_keyword_unicode_extension(
$locale.as_bytes(),
) {
Ok((language, script, region, variant, keyword)) => $crate::Locale {
id: $crate::LanguageIdentifier {
language,
script,
region,
variants: match variant {
Some(v) => $crate::subtags::Variants::from_variant(v),
None => $crate::subtags::Variants::new(),
},
},
extensions: match keyword {
Some(k) => $crate::extensions::Extensions::from_unicode(
$crate::extensions::unicode::Unicode {
keywords: $crate::extensions::unicode::Keywords::new_single(
k.0,
$crate::extensions::unicode::Value::from_tinystr(k.1),
),
attributes: $crate::extensions::unicode::Attributes::new(),
},
),
None => $crate::extensions::Extensions::new(),
},
},
#[allow(clippy::panic)] // const context
_ => panic!(concat!(
"Invalid language code: ",
$locale,
" . Note the locale! macro only supports up to one variant tag; \
unicode extensions are not supported. Use \
runtime parsing instead."
)),
};
R
}};
}
#[cfg(test)]
mod test {
use crate::LanguageIdentifier;
use crate::Locale;
#[test]
fn test_langid_macro_can_parse_langid_with_single_variant() {
const DE_AT_FOOBAR: LanguageIdentifier = langid!("de_at-foobar");
let de_at_foobar: LanguageIdentifier = "de_at-foobar".parse().unwrap();
assert_eq!(DE_AT_FOOBAR, de_at_foobar);
}
#[test]
fn test_locale_macro_can_parse_locale_with_single_variant() {
const DE_AT_FOOBAR: Locale = locale!("de_at-foobar");
let de_at_foobar: Locale = "de_at-foobar".parse().unwrap();
assert_eq!(DE_AT_FOOBAR, de_at_foobar);
}
#[test]
fn test_locale_macro_can_parse_locale_with_single_keyword_unicode_extension() {
const DE_AT_U_CA_FOOBAR: Locale = locale!("de_at-u-ca-foobar");
let de_at_u_ca_foobar: Locale = "de_at-u-ca-foobar".parse().unwrap();
assert_eq!(DE_AT_U_CA_FOOBAR, de_at_u_ca_foobar);
}
}