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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef FILECACHE_H
#define FILECACHE_H
#include <QtCore/qlist.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringview.h>
#include <optional>
QT_FORWARD_DECLARE_CLASS(QRegularExpression)
QT_FORWARD_DECLARE_CLASS(QDebug)
// Queue-based cache for the contents of a number of recent files with a
// convenience API for retrieving lines and regexp-delimited snippets.
class FileCache
{
public:
using Lines = QList<QStringView>;
std::optional<QString> fileContents(const QString &name);
std::optional<Lines> lines(const QString &name);
std::optional<QString> fileSnippet(const QString &name,
const QString &snippetName,
const QRegularExpression &snippetPattern);
const QString &errorString() const { return m_error; }
void formatDebug(QDebug &debug) const;
private:
struct FileCacheEntry
{
QString name;
QString contents;
Lines lines;
};
qsizetype ensureEntry(const QString &name);
qsizetype indexOf(const QString &name) const;
static void ensureLines(FileCacheEntry *entry);
QList<FileCacheEntry> m_cache;
QString m_error;
int m_hits = 0;
int m_misses = 0;
};
QDebug operator<<(QDebug debug, const FileCache &c);
#endif // FILECACHE_H
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