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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// Contains the API configuration as prescribed by ECMA 402.
///
/// The meaning of the options is the same as in the similarly named
/// options in the JS version.
///
/// See [Options] for the contents of the options. See the [Collator::try_new]
/// for the use of the options.
pub mod options {
/// Set the intended usage for this collation.
#[derive(Eq, PartialEq, Debug, Clone)]
pub enum Usage {
/// Use collation for sorting. Default.
Sort,
/// Use collation for searching.
Search,
}
/// Set the sensitivity of the collation.
///
/// Which differences in the strings should lead to non-zero result values.
#[derive(Eq, PartialEq, Debug, Clone)]
pub enum Sensitivity {
/// Only strings that differ in base letters compare as unequal.
/// Examples: a ≠ b, a = á, a = A.
Base,
/// Only strings that differ in base letters or accents and other diacritic marks compare
/// as unequal. Examples: a ≠ b, a ≠ á, a = A.
Accent,
/// Only strings that differ in base letters or case compare as unequal.
/// Examples: a ≠ b, a = á, a ≠ A.
Case,
/// Strings that differ in base letters, accents and other diacritic marks, or case compare
/// as unequal. Other differences may also be taken into consideration.
/// Examples: a ≠ b, a ≠ á, a ≠ A.
Variant,
}
/// Whether punctuation should be ignored.
#[derive(Eq, PartialEq, Debug, Clone)]
pub enum Punctuation {
/// Ignore punctuation.
Ignore,
/// Honor punctuation.
Honor,
}
/// Whether numeric collation should be used, such that "1" < "2" < "10".
///
/// This option can be set through an options property or through a Unicode extension key; if
/// both are provided, the options property takes precedence. Implementations are not required
/// to support this property.
#[derive(Eq, PartialEq, Debug, Clone)]
pub enum Numeric {
/// Use numeric comparison.
Use,
/// Do not use numeric comparision.
Ignore,
}
/// Whether upper case or lower case should sort first.
///
/// This option can be set through an options property or through a Unicode extension key; if
/// both are provided, the options property takes precedence. Implementations are not required
/// to support this property.
#[derive(Eq, PartialEq, Debug, Clone)]
pub enum CaseFirst {
/// Sort upper case first.
Upper,
/// Sort lower case first.
Lower,
/// Use locale default for case sorting.
False,
}
}
/// The options set by the user at construction time. See discussion at the top level
/// about the name choice. Provides as a "bag of options" since we don't expect any
/// implementations to be attached to this struct.
///
/// The default values of all the options are prescribed in by the [TC39 report][tc39].
///
/// [tc39]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Collator/Collator
#[derive(Eq, PartialEq, Debug, Clone)]
pub struct Options {
pub usage: options::Usage,
pub sensitivity: options::Sensitivity,
pub punctuation: options::Punctuation,
pub numeric: options::Numeric,
pub case_first: options::CaseFirst,
}
impl Default for Options {
/// Gets the default values of [Options] if omitted at setup. The
/// default values are prescribed by the TC39. See [Collator][tc39c].
///
/// [tc39c]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Collator/Collator
fn default() -> Self {
Options {
usage: options::Usage::Sort,
sensitivity: options::Sensitivity::Variant,
punctuation: options::Punctuation::Honor,
numeric: options::Numeric::Ignore,
case_first: options::CaseFirst::False,
}
}
}
pub trait Collator {
/// The type of error reported, if any.
type Error: std::error::Error;
/// Creates a new [Collator].
///
/// Creation may fail, for example, if the locale-specific data is not loaded, or if
/// the supplied options are inconsistent.
fn try_new<L>(l: L, opts: Options) -> Result<Self, Self::Error>
where
L: crate::Locale,
Self: Sized;
/// Compares two strings according to the sort order of this [Collator].
///
/// Returns 0 if `first` and `second` are equal. Returns a negative value
/// if `first` is less, and a positive value of `second` is less.
fn compare<P, Q>(first: P, second: Q) -> i8
where
P: AsRef<str>,
Q: AsRef<str>;
}