71 lines
2.7 KiB
Plaintext
71 lines
2.7 KiB
Plaintext
#include <mbgl/style/expression/collator.hpp>
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#include <sstream>
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#import <Foundation/Foundation.h>
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namespace mbgl {
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namespace style {
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namespace expression {
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class Collator::Impl {
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public:
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Impl(bool caseSensitive, bool diacriticSensitive, optional<std::string> locale_)
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: options((caseSensitive ? 0 : NSCaseInsensitiveSearch) |
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(diacriticSensitive ? 0 : NSDiacriticInsensitiveSearch))
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, locale(locale_ ?
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[[NSLocale alloc] initWithLocaleIdentifier:@((*locale_).c_str())] :
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[NSLocale currentLocale])
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{}
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bool operator==(const Impl& other) const {
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return options == other.options &&
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[[locale localeIdentifier] isEqualToString:[other.locale localeIdentifier]];
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}
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int compare(const std::string& lhs, const std::string& rhs) const {
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NSString* nsLhs = @(lhs.c_str());
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NSString* nsRhs = @(rhs.c_str());
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// Limiting the compare range to the length of the LHS seems weird, but
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// experimentally we've checked that if LHS is a prefix of RHS compare returns -1
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// https://developer.apple.com/documentation/foundation/nsstring/1414561-compare
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NSRange compareRange = NSMakeRange(0, nsLhs.length);
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return static_cast<int>([nsLhs compare:nsRhs options:options range:compareRange locale:locale]);
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}
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std::string resolvedLocale() const {
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// Following documentation at:
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// https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPInternational/LanguageandLocaleIDs/LanguageandLocaleIDs.html#//apple_ref/doc/uid/10000171i-CH15-SW9
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// We expect NSLocale to accept BCP 47 tags as localeIdentifier inputs, but the output format
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// may append the region tag with an "_". Changing that to a "-" makes the identifier BCP 47 compliant.
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// Experimentally, "zh-Hans-HK" and "zh-Hans_HK" both round trip -- if the second is used by
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// `currentLocale`, we don't want to return the underscore.
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return [[locale localeIdentifier] stringByReplacingOccurrencesOfString:@"_" withString:@"-"].UTF8String;
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}
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private:
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NSStringCompareOptions options;
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NSLocale* locale;
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};
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Collator::Collator(bool caseSensitive, bool diacriticSensitive, optional<std::string> locale_)
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: impl(std::make_shared<Impl>(caseSensitive, diacriticSensitive, std::move(locale_)))
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{}
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bool Collator::operator==(const Collator& other) const {
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return *impl == *(other.impl);
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}
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int Collator::compare(const std::string& lhs, const std::string& rhs) const {
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return impl->compare(lhs, rhs);
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}
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std::string Collator::resolvedLocale() const {
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return impl->resolvedLocale();
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}
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} // namespace expression
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} // namespace style
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} // namespace mbgl
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