qloggingregistry_p.h

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QLOGGINGREGISTRY_P_H
#define QLOGGINGREGISTRY_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of a number of Qt sources files.  This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtCore/private/qglobal_p.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qlist.h>
#include <QtCore/qhash.h>
#include <QtCore/qmap.h>
#include <QtCore/qmutex.h>
#include <QtCore/qstring.h>
#include <QtCore/qtextstream.h>
 
class tst_QLoggingRegistry;
 
QT_BEGIN_NAMESPACE
 
#define Q_LOGGING_CATEGORY_WITH_ENV_OVERRIDE(name, env, categoryName) \
    const QLoggingCategory &name() \
    { \
        static constexpr char cname[] = categoryName;                               \
        static_assert(cname[0] == 'q' && cname[1] == 't' && cname[2] == '.'         \
                      && cname[4] != '\0', "Category name must start with 'qt.'");  \
        static const QLoggingCategoryWithEnvironmentOverride category(cname, env);  \
        return category;                                                            \
    }
 
class Q_AUTOTEST_EXPORT QLoggingRule
{
public:
    QLoggingRule();
    QLoggingRule(QStringView pattern, bool enabled);
    int pass(QLatin1StringView categoryName, QtMsgType type) const;
 
    enum PatternFlag {
        FullText = 0x1,
        LeftFilter = 0x2,
        RightFilter = 0x4,
        MidFilter = LeftFilter | RightFilter
    };
    Q_DECLARE_FLAGS(PatternFlags, PatternFlag)
 
    QString category;
    int messageType;
    PatternFlags flags;
    bool enabled;
 
private:
    void parse(QStringView pattern);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QLoggingRule::PatternFlags)
Q_DECLARE_TYPEINFO(QLoggingRule, Q_RELOCATABLE_TYPE);
 
class Q_AUTOTEST_EXPORT QLoggingSettingsParser
{
public:
    void setImplicitRulesSection(bool inRulesSection) { m_inRulesSection = inRulesSection; }
 
    void setContent(QStringView content);
    void setContent(QTextStream &stream);
 
    QList<QLoggingRule> rules() const { return _rules; }
 
private:
    void parseNextLine(QStringView line);
 
private:
    bool m_inRulesSection = false;
    QList<QLoggingRule> _rules;
};
 
class Q_AUTOTEST_EXPORT QLoggingRegistry
{
public:
    QLoggingRegistry();
 
    void initializeRules();
 
    void registerCategory(QLoggingCategory *category, QtMsgType enableForLevel);
    void unregisterCategory(QLoggingCategory *category);
 
#ifndef QT_BUILD_INTERNAL
    Q_CORE_EXPORT   // always export from QtCore
#endif
    void registerEnvironmentOverrideForCategory(QByteArrayView categoryName, QByteArrayView environment);
 
    void setApiRules(const QString &content);
 
    QLoggingCategory::CategoryFilter
    installFilter(QLoggingCategory::CategoryFilter filter);
 
    static QLoggingRegistry *instance();
 
private:
    void updateRules();
 
    static void defaultCategoryFilter(QLoggingCategory *category);
 
    enum RuleSet {
        // sorted by order in which defaultCategoryFilter considers them:
        QtConfigRules,
        ConfigRules,
        ApiRules,
        EnvironmentRules,
 
        NumRuleSets
    };
 
    QMutex registryMutex;
 
    // protected by mutex:
    QList<QLoggingRule> ruleSets[NumRuleSets];
    QHash<QLoggingCategory *, QtMsgType> categories;
    QLoggingCategory::CategoryFilter categoryFilter;
    QMap<QByteArrayView, QByteArrayView> qtCategoryEnvironmentOverrides;
 
    friend class ::tst_QLoggingRegistry;
};
 
class QLoggingCategoryWithEnvironmentOverride : public QLoggingCategory
{
public:
    QLoggingCategoryWithEnvironmentOverride(const char *category, const char *env)
        : QLoggingCategory(registerOverride(category, env), QtInfoMsg)
    {}
 
private:
    static const char *registerOverride(QByteArrayView categoryName, QByteArrayView environment)
    {
        QLoggingRegistry *c = QLoggingRegistry::instance();
        if (c)
            c->registerEnvironmentOverrideForCategory(categoryName, environment);
        return categoryName.data();
    }
};
 
QT_END_NAMESPACE
 
#endif // QLOGGINGREGISTRY_P_H