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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "xt9ldbmanager.h"
#include "xt9dbfile.h"
#include <QDirIterator>
#include <QLibraryInfo>
#include <QMap>
#include <QtVirtualKeyboard/private/settings_p.h>
QT_BEGIN_NAMESPACE
namespace QtVirtualKeyboard {
const QRegularExpression Xt9LdbManager::ldbRegex = QRegularExpression(QStringLiteral("([A-Z]{2})([a-z]{2})(?:UN)(.*?)(?:_xt9_?)?((?:CJI_|HC_|big_)?ALM3?)?(\\.ldb|\\.phd)"));
Xt9LdbManager::Xt9LdbManager() :
_phdEnabled(false)
{
QString xt9LdbPath(qEnvironmentVariable("QT_VIRTUALKEYBOARD_XT9_LDB_PATH"));
const QString pathListSep(
#if defined(Q_OS_WIN32)
QStringLiteral(";")
#else
QStringLiteral(":")
#endif
);
QStringList userPaths(xt9LdbPath.split(pathListSep, Qt::SkipEmptyParts));
const QStringList defaultPaths = userPaths
<< QDir(QStringLiteral("%1/qtvirtualkeyboard/cerence/xt9/").arg(QLibraryInfo::path(QLibraryInfo::DataPath))).absolutePath()
<< QLatin1String(":/qt-project.org/imports/QtQuick/VirtualKeyboard/Cerence/Xt9")
;
for (const QString &defaultPath : defaultPaths) {
addSearchPath(defaultPath);
}
}
void Xt9LdbManager::addSearchPath(const QString &searchPath)
{
if (!searchPaths.contains(searchPath))
searchPaths.append(searchPath);
}
void Xt9LdbManager::setPhdEnabled(bool enabled)
{
_phdEnabled = enabled;
}
bool Xt9LdbManager::phdEnabled() const
{
return _phdEnabled;
}
bool Xt9LdbManager::loadDictionary(const QLocale &locale, const void *&data, qint64 &size)
{
const QString language = locale.name();
if (ldbMap.contains(language)) {
QSharedPointer<Xt9DbFile> ldb = ldbMap[language];
if (_phdEnabled || !ldb->fileName().endsWith(QLatin1String(".phd"), Qt::CaseInsensitive)) {
data = ldb->roData();
size = ldb->size();
return true;
}
}
QString dictionaryFile = findDictionary(locale);
if (!dictionaryFile.isEmpty()) {
QSharedPointer<Xt9DbFile> ldb(new Xt9DbFile(dictionaryFile));
data = ldb->roData();
size = ldb->size();
if (data) {
ldbMap[language] = ldb;
return true;
}
}
data = nullptr;
size = 0;
return false;
}
void Xt9LdbManager::closeAll()
{
ldbMap.clear();
}
QString Xt9LdbManager::findDictionary(const QLocale &locale) const
{
QStringList languageCountry = locale.name().split(QLatin1String("_"));
if (languageCountry.size() != 2)
return QString();
const QString language_ISO_639_1 = languageCountry[0].toUpper();
const QString country = languageCountry[1].toUpper();
const QLocale::Script script = locale.script();
QMap<QString, int> matchedDictionaries;
for (const QString &ldbDirectory : searchPaths) {
QDirIterator it(ldbDirectory, QDirIterator::NoIteratorFlags);
while (it.hasNext()) {
QString fileEntry = it.next();
const QFileInfo fileInfo(fileEntry);
if (fileInfo.isDir())
continue;
QString fileName(fileInfo.fileName());
fileName.remove(QRegularExpression(QLatin1String("^zzEval_")));
QRegularExpressionMatch match = ldbRegex.match(fileName);
if (!match.hasMatch())
continue;
QString xt9Language = match.captured(1);
// Special case for language codes not following ISO 639-1
if (xt9Language == QLatin1String("NO"))
xt9Language = QStringLiteral("NB");
const QString ext(match.captured(5));
if (xt9Language == language_ISO_639_1 &&
(ext == QLatin1String(".ldb") || (_phdEnabled && ext == QLatin1String(".phd")))) {
int score = 1;
QString xt9CountryOrDetail = match.captured(3);
const QString charsetClassifier = match.captured(2);
const QString almClassifier = match.captured(4);
// Special case for country codes not following ISO 639-1
if (xt9CountryOrDetail == QLatin1String("UK"))
xt9CountryOrDetail = QStringLiteral("GB");
else if (xt9CountryOrDetail == QLatin1String("latam"))
xt9CountryOrDetail = QStringLiteral("MX");
else if (xt9CountryOrDetail.isEmpty() && country == language_ISO_639_1)
xt9CountryOrDetail = country;
if (xt9CountryOrDetail == country ||
((script == QLocale::SimplifiedHanScript && charsetClassifier == QLatin1String("sb")) ||
(script == QLocale::TraditionalHanScript && charsetClassifier == QLatin1String("tb"))))
++score;
if (locale.territory() == QLocale::Taiwan && xt9CountryOrDetail == QLatin1String("ps_Big5_bpmf_pinyin_CJ"))
++score;
else if (locale.territory() == QLocale::HongKong && xt9CountryOrDetail == QLatin1String("ps_Big5HKSCS_bpmf_pinyin_CJ"))
++score;
if (!almClassifier.isEmpty())
++score;
matchedDictionaries.insert(fileEntry, score);
}
}
}
if (matchedDictionaries.isEmpty())
return QString();
QList<int> scoreList = matchedDictionaries.values();
std::sort(scoreList.begin(), scoreList.end());
const int highScore = scoreList.last();
const QString bestMatch = matchedDictionaries.key(highScore);
return bestMatch;
}
} // namespace QtVirtualKeyboard
QT_END_NAMESPACE
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