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QXml_impl.h 6.39 KB
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/****************************************************************************
 * **
 * ** Copyright (C) 2019 MinMaxMedical.
 * ** All rights reserved.
 * ** Contact: MinMaxMedical <InCAS@MinMaxMedical.com>
 * **
 * ** This file is part of the modmedLog module.
 * **
 * ** $QT_BEGIN_LICENSE:BSD$
 * ** You may use this file under the terms of the BSD license as follows:
 * **
 * ** "Redistribution and use in source and binary forms, with or without
 * ** modification, are permitted provided that the following conditions are
 * ** met:
 * **   * Redistributions of source code must retain the above copyright
 * **     notice, this list of conditions and the following disclaimer.
 * **   * Redistributions in binary form must reproduce the above copyright
 * **     notice, this list of conditions and the following disclaimer in
 * **     the documentation and/or other materials provided with the
 * **     distribution.
 * **   * Neither the name of MinMaxMedical S.A.S. and its Subsidiary(-ies) nor
 * **     the names of its contributors may be used to endorse or promote
 * **     products derived from this software without specific prior written
 * **     permission.
 * **
 * ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 * ** $QT_END_LICENSE$
 * **
 * ****************************************************************************/
#pragma once

#include <type_traits>

#include <QtCore/qxmlstream.h>

#include "QBind_impl.h"

// //////////////////////////////////////////////////////////////////////////
// QBind<T,QXmlStreamWriter> support

//! \warning Since XML has no standard way of encoding data structures, we choose a rather implicit one
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//! based on the fact that XML elements are implicit data structures unless they contain text without elements,
//! in which case it is customary to let the reader interpret XML text representation as specific data types.
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//! \li sequence  :       element named after outer item or metaData[qmName] or "sequence"
//! \li record    :       element named after outer item or metaData[qmName] or "record"
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//! \li null      : empty element named after outer item or metaData[qmName] or "null"
//! \li BindNative: text  element named after outer item or metaData[qmName] or XSD typename, containing the default text representation
//! \see https://www.w3.org/TR/xmlschema-2/#built-in-datatypes
//! \note Selecting heterogeneous sequence items reliably can still be made using XPath "*[i]"
//! \note A more explicit encoding variant could add implicit type information as an attribute to enable roundtrips to/from other generic data structures at the expense of space
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class QXmlWriter : public IWriter
{
    Q_DISABLE_COPY(QXmlWriter)
public:
    QXmlWriter(QXmlStreamWriter* io) : io(io) { Q_ASSERT(io); }

    BindMode mode() const noexcept { return BindMode::Write; }

    // Shortcuts
    Val<Cursor> value   (                  ) { return Cursor(this).value(); }
    Val<Cursor> meta    (     QMetaData&& m) { return Cursor(this).value().meta(m); }
    Seq<Cursor> sequence(quint32* s=nullptr) { return Cursor(this).value().sequence(s); }

    template<typename T> Cursor  bind(T&& t) { return Cursor(this).value().bind(std::forward<T>(t)); }
protected:
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    bool _sequence(quint32* =nullptr) { io->writeStartElement(tag(QName("sequence"))); att(); return true; }
    bool _record  (quint32* =nullptr) { io->writeStartElement(tag(QName("record"  ))); att(); return true; }
    bool _null    (                 ) { io->writeEmptyElement(tag(QName("null"    ))); att(); return true; }
    bool _bind    (   const char* u8) { writeText(QName("string" ),u8                   ); return true; }
    bool _bind    (         bool&& b) { writeText(QName("boolean"), b ? "true" : "false"); return true; }
    bool _bind    (       qint64&& n) { const int s=66; char c[s]; writeText(QName("integer"),  qlltoa2(c+s, n)); return true; }
    bool _bind    (      quint64&& n) { const int s=66; char c[s]; writeText(QName("integer"), qulltoa2(c+s, n)); return true; }
    bool _bind    (        float&& n) { static QUtf8String s; s.setNum(double(n),'g',std::numeric_limits<   float>::max_digits10); writeText(QName("decimal"  ), s  ); return true; } // with specific precision
    bool _bind    (       double&& n) { static QUtf8String s; s.setNum(       n ,'g',std::numeric_limits<  double>::max_digits10); writeText(QName("decimal"  ), s  ); return true; } // with specific precision
    bool _bind    (   QByteArray&& s) { QUtf8String hex(s.size()*2+2+1,'\0'); hex.append("0x"); hex.append(s.toHex().toUpper())  ; writeText(QName("hexBinary"), hex); return true; }
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    bool _isOk() noexcept { return !io->hasError(); }

    bool _out (       ) { io->writeEndElement(); return true; }
    bool _item(       ) { return true; }
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    bool _item(QName n) { name=n; return true; }
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    void _meta(QMetaData& m) {
        for (auto&& kv : m) {
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            if (kv.first == qmName) {
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                name = QName(kv.second.utf8());
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            }
            else {
                auto found = metaData.find(kv.first);
                if (found!=metaData.end()) {
                    found->second = kv.second;
                }
                else {
                    metaData.push_back(kv);
                }
            }
        }
    }
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private:
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    void writeText(QName def, QString text) { io->writeStartElement(tag(def)); att(); io->writeCharacters(text); io->writeEndElement(); }
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    QLatin1String tag(QName def) { if (name.isNull()) { return def.toLatin1(); } auto n=name; name=QName(); return n.toLatin1(); }
    void att() { for (auto&& a : metaData) { if (!a.second.isNull()) io->writeAttribute(a.first.toLatin1(), QString::fromUtf8(a.second)); } }
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    QXmlStreamWriter* io;
    QMetaData metaData;
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    QName name;
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};