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#include "cpplocatorfilter.h"
#include "cppmodelmanager.h"

#include <QStringMatcher>

using namespace CppTools;
using namespace CppTools::Internal;

CppLocatorFilter::CppLocatorFilter(CppLocatorData *locatorData)
    : m_data(locatorData)
{
    setId("Classes and Methods");
    setDisplayName(tr("C++ Classes, Enums and Functions"));
    setShortcutString(QString(QLatin1Char(':')));
    setIncludedByDefault(false);
}

CppLocatorFilter::~CppLocatorFilter()
{
}

Core::LocatorFilterEntry CppLocatorFilter::filterEntryFromIndexItem(IndexItem::Ptr info)
{
    const QVariant id = qVariantFromValue(info);
    Core::LocatorFilterEntry filterEntry(this, info->scopedSymbolName(), id, info->icon());
    if (info->type() == IndexItem::Class || info->type() == IndexItem::Enum)
        filterEntry.extraInfo = info->shortNativeFilePath();
    else
        filterEntry.extraInfo = info->symbolType();

    return filterEntry;
}

void CppLocatorFilter::refresh(QFutureInterface<void> &future)
{
    Q_UNUSED(future)
}

static bool compareLexigraphically(const Core::LocatorFilterEntry &a,
                                   const Core::LocatorFilterEntry &b)
{
    return a.displayName < b.displayName;
}

QList<Core::LocatorFilterEntry> CppLocatorFilter::matchesFor(
        QFutureInterface<Core::LocatorFilterEntry> &future, const QString &origEntry)
{
    QString entry = trimWildcards(origEntry);
    QList<Core::LocatorFilterEntry> goodEntries;
    QList<Core::LocatorFilterEntry> betterEntries;
    const QChar asterisk = QLatin1Char('*');
    QStringMatcher matcher(entry, Qt::CaseInsensitive);
    QRegExp regexp(asterisk + entry+ asterisk, Qt::CaseInsensitive, QRegExp::Wildcard);
    if (!regexp.isValid())
        return goodEntries;
    bool hasWildcard = (entry.contains(asterisk) || entry.contains(QLatin1Char('?')));
    bool hasColonColon = entry.contains(QLatin1String("::"));
    const Qt::CaseSensitivity caseSensitivityForPrefix = caseSensitivity(entry);
    const IndexItem::ItemType wanted = matchTypes();

    m_data->filterAllFiles([&](const IndexItem::Ptr &info) -> IndexItem::VisitorResult {
        if (future.isCanceled())
            return IndexItem::Break;
        if (info->type() & wanted) {
            const QString matchString = hasColonColon ? info->scopedSymbolName() : info->symbolName();
            if ((hasWildcard && regexp.exactMatch(matchString)) ||
                    (!hasWildcard && matcher.indexIn(matchString) != -1)) {
                const Core::LocatorFilterEntry filterEntry = filterEntryFromIndexItem(info);
                if (matchString.startsWith(entry, caseSensitivityForPrefix))
                    betterEntries.append(filterEntry);
                else
                    goodEntries.append(filterEntry);
            }
        }

        if (info->type() & IndexItem::Enum)
            return IndexItem::Continue;
        else
            return IndexItem::Recurse;
    });

    if (goodEntries.size() < 1000)
        qStableSort(goodEntries.begin(), goodEntries.end(), compareLexigraphically);
    if (betterEntries.size() < 1000)
        qStableSort(betterEntries.begin(), betterEntries.end(), compareLexigraphically);

    betterEntries += goodEntries;
    return betterEntries;
}

void CppLocatorFilter::accept(Core::LocatorFilterEntry selection) const
{
    IndexItem::Ptr info = qvariant_cast<CppTools::IndexItem::Ptr>(selection.internalData);
    Core::EditorManager::openEditorAt(info->fileName(), info->line(), info->column());
}
