chromium/third_party/icu/source/common/locdistance.cpp

// © 2019 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// locdistance.cpp
// created: 2019may08 Markus W. Scherer

#include "unicode/utypes.h"
#include "unicode/bytestrie.h"
#include "unicode/localematcher.h"
#include "unicode/locid.h"
#include "unicode/uobject.h"
#include "unicode/ures.h"
#include "cstring.h"
#include "locdistance.h"
#include "loclikelysubtags.h"
#include "uassert.h"
#include "ucln_cmn.h"
#include "uinvchar.h"
#include "umutex.h"

U_NAMESPACE_BEGIN

namespace {

/**
 * Bit flag used on the last character of a subtag in the trie.
 * Must be set consistently by the builder and the lookup code.
 */
constexpr int32_t END_OF_SUBTAG = …;
/** Distance value bit flag, set by the builder. */
constexpr int32_t DISTANCE_SKIP_SCRIPT = …;
/** Distance value bit flag, set by trieNext(). */
constexpr int32_t DISTANCE_IS_FINAL = …;
constexpr int32_t DISTANCE_IS_FINAL_OR_SKIP_SCRIPT = …;

constexpr int32_t ABOVE_THRESHOLD = …;

// Indexes into array of distances.
enum { … };

LocaleDistance *gLocaleDistance = …;
UInitOnce gInitOnce { … };

UBool U_CALLCONV cleanup() { … }

}  // namespace

void U_CALLCONV LocaleDistance::initLocaleDistance(UErrorCode &errorCode) { … }

const LocaleDistance *LocaleDistance::getSingleton(UErrorCode &errorCode) { … }

LocaleDistance::LocaleDistance(const LocaleDistanceData &data, const XLikelySubtags &likely) : … { … }

int32_t LocaleDistance::getBestIndexAndDistance(
        const LSR &desired,
        const LSR **supportedLSRs, int32_t supportedLSRsLength,
        int32_t shiftedThreshold,
        ULocMatchFavorSubtag favorSubtag, ULocMatchDirection direction) const { … }

int32_t LocaleDistance::getDesSuppScriptDistance(
        BytesTrie &iter, uint64_t startState, const char *desired, const char *supported) { … }

int32_t LocaleDistance::getRegionPartitionsDistance(
        BytesTrie &iter, uint64_t startState,
        const char *desiredPartitions, const char *supportedPartitions, int32_t threshold) { … }

int32_t LocaleDistance::getFallbackRegionDistance(BytesTrie &iter, uint64_t startState) { … }

int32_t LocaleDistance::trieNext(BytesTrie &iter, const char *s, bool wantValue) { … }

UBool LocaleDistance::isParadigmLSR(const LSR &lsr) const { … }

U_NAMESPACE_END