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diff --git a/src/xml/dom/qdomhelpers_p.h b/src/xml/dom/qdomhelpers_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtXml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QDOMHELPERS_P_H
+#define QDOMHELPERS_P_H
+
+#include <qcoreapplication.h>
+#include <qglobal.h>
+#include <qxml.h>
+
+QT_BEGIN_NAMESPACE
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists for the convenience of
+// qxml.cpp and qdom.cpp. This header file may change from version to version without
+// notice, or even be removed.
+//
+// We mean it.
+//
+
+class QDomDocumentPrivate;
+class QDomNodePrivate;
+class QXmlStreamReader;
+class QXmlStreamAttributes;
+
+/**************************************************************
+ *
+ * QXmlDocumentLocators
+ *
+ **************************************************************/
+
+/* TODO: QXmlDocumentLocator can be removed when the SAX-based
+ * implementation is removed. Right now it is needed for QDomBuilder
+ * to work with both QXmlStreamReader and QXmlInputSource (SAX)
+ * based implementations.
+ */
+class QXmlDocumentLocator
+{
+public:
+    virtual ~QXmlDocumentLocator() = default;
+    virtual int column() const = 0;
+    virtual int line() const = 0;
+};
+
+class QDomDocumentLocator : public QXmlDocumentLocator
+{
+public:
+    QDomDocumentLocator(QXmlStreamReader *r) : reader(r) {}
+    ~QDomDocumentLocator() override = default;
+
+    int column() const override;
+    int line() const override;
+
+private:
+    QXmlStreamReader *reader;
+};
+
+#if QT_DEPRECATED_SINCE(5, 15)
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+
+class QSAXDocumentLocator : public QXmlDocumentLocator
+{
+public:
+    ~QSAXDocumentLocator() override = default;
+
+    int column() const override;
+    int line() const override;
+
+    void setLocator(QXmlLocator *l);
+
+private:
+    QXmlLocator *locator = nullptr;
+};
+
+QT_WARNING_POP
+
+#endif
+
+/**************************************************************
+ *
+ * QDomBuilder
+ *
+ **************************************************************/
+
+class QDomBuilder
+{
+public:
+    QDomBuilder(QDomDocumentPrivate *d, QXmlDocumentLocator *l, bool namespaceProcessing);
+    ~QDomBuilder();
+
+    bool endDocument();
+#if QT_DEPRECATED_SINCE(5, 15)
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+    bool startElement(const QString &nsURI, const QString &qName, const QXmlAttributes &atts);
+QT_WARNING_POP
+#endif
+    bool startElement(const QString &nsURI, const QString &qName, const QXmlStreamAttributes &atts);
+    bool endElement();
+    bool characters(const QString &characters, bool cdata = false);
+    bool processingInstruction(const QString &target, const QString &data);
+    bool skippedEntity(const QString &name);
+    bool startEntity(const QString &name);
+    bool endEntity();
+    bool startDTD(const QString &name, const QString &publicId, const QString &systemId);
+    bool comment(const QString &characters);
+    bool externalEntityDecl(const QString &name, const QString &publicId, const QString &systemId);
+    bool notationDecl(const QString &name, const QString &publicId, const QString &systemId);
+    bool unparsedEntityDecl(const QString &name, const QString &publicId, const QString &systemId,
+                            const QString &notationName);
+
+    void fatalError(const QString &message);
+
+    using ErrorInfo = std::tuple<QString, int, int>;
+    ErrorInfo error() const;
+
+    QString errorMsg;
+    int errorLine;
+    int errorColumn;
+
+private:
+    QDomDocumentPrivate *doc;
+    QDomNodePrivate *node;
+    QXmlDocumentLocator *locator;
+    QString entityName;
+    bool nsProcessing;
+};
+
+#if QT_DEPRECATED_SINCE(5, 15)
+
+/**************************************************************
+ *
+ * QDomHandler
+ *
+ **************************************************************/
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+
+class QDomHandler : public QXmlDefaultHandler
+{
+public:
+    QDomHandler(QDomDocumentPrivate *d, QXmlSimpleReader *reader, bool namespaceProcessing);
+    ~QDomHandler() override;
+
+    // content handler
+    bool endDocument() override;
+    bool startElement(const QString &nsURI, const QString &localName, const QString &qName,
+                      const QXmlAttributes &atts) override;
+    bool endElement(const QString &nsURI, const QString &localName, const QString &qName) override;
+    bool characters(const QString &ch) override;
+    bool processingInstruction(const QString &target, const QString &data) override;
+    bool skippedEntity(const QString &name) override;
+
+    // error handler
+    bool fatalError(const QXmlParseException &exception) override;
+
+    // lexical handler
+    bool startCDATA() override;
+    bool endCDATA() override;
+    bool startEntity(const QString &) override;
+    bool endEntity(const QString &) override;
+    bool startDTD(const QString &name, const QString &publicId, const QString &systemId) override;
+    bool comment(const QString &ch) override;
+
+    // decl handler
+    bool externalEntityDecl(const QString &name, const QString &publicId,
+                            const QString &systemId) override;
+
+    // DTD handler
+    bool notationDecl(const QString &name, const QString &publicId,
+                      const QString &systemId) override;
+    bool unparsedEntityDecl(const QString &name, const QString &publicId, const QString &systemId,
+                            const QString &notationName) override;
+
+    void setDocumentLocator(QXmlLocator *locator) override;
+
+    QDomBuilder::ErrorInfo errorInfo() const;
+
+private:
+    bool cdata;
+    QXmlSimpleReader *reader;
+    QSAXDocumentLocator locator;
+    QDomBuilder domBuilder;
+};
+
+QT_WARNING_POP
+
+#endif // QT_DEPRECATED_SINCE(5, 15)
+
+/**************************************************************
+ *
+ * QDomParser
+ *
+ **************************************************************/
+
+class QDomParser
+{
+    Q_DECLARE_TR_FUNCTIONS(QDomParser)
+public:
+    QDomParser(QDomDocumentPrivate *d, QXmlStreamReader *r, bool namespaceProcessing);
+
+    bool parse();
+    QDomBuilder::ErrorInfo errorInfo() const;
+
+private:
+    bool parseProlog();
+    bool parseBody();
+    bool parseMarkupDecl();
+
+    QXmlStreamReader *reader;
+    QDomDocumentLocator locator;
+    QDomBuilder domBuilder;
+};
+
+QT_END_NAMESPACE
+
+#endif // QDOMHELPERS_P_H