summaryrefslogtreecommitdiffstats
path: root/src/xmlpatterns/api/qabstractxmlforwarditerator_p.h
blob: e005689956a6ba275b214f0de14549d085b79106 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef QABSTRACTXMLFORWARDITERATOR_H
#define QABSTRACTXMLFORWARDITERATOR_H

#include <QtCore/QList>
#include <QtCore/QVector>
#include <QtCore/QSharedData>
#include <QtCore/QString>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(XmlPatterns)

template<typename T> class QVector;

/* In this file we in some cases do not use QAbstractXmlForwardIterator's Ptr typedef.
 * This is a compiler workaround for MS VS 6.0. */

template<typename T>
inline bool qIsForwardIteratorEnd(const T &unit)
{
    return !unit;
}

/**
 * @short Helper class for StringSplitter
 *
 * Needed by the QAbstractXmlForwardIterator sub-class.
 *
 * @relates StringSplitter
 */
template<>
inline bool qIsForwardIteratorEnd(const QString &unit)
{
    return unit.isNull();
}

template<typename T> class QAbstractXmlForwardIterator;

class QAbstractXmlForwardIteratorPrivate;

template<typename T>
class QAbstractXmlForwardIterator : public QSharedData
{
public:
    typedef QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<T> > Ptr;
    typedef QList<QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<T> > > List;
    typedef QVector<QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<T> > > Vector;

    inline QAbstractXmlForwardIterator() : d_ptr(0) {}
    virtual ~QAbstractXmlForwardIterator() {}

    virtual T next() = 0;
    virtual T current() const = 0;

    virtual qint64 position() const = 0;

    virtual typename QAbstractXmlForwardIterator<T>::Ptr toReversed();
    virtual QList<T> toList();
    virtual typename QAbstractXmlForwardIterator<T>::Ptr copy() const;
    virtual T last();
    virtual bool isEmpty();
    virtual qint64 count();
    virtual qint64 sizeHint() const;

private:
    Q_DISABLE_COPY(QAbstractXmlForwardIterator<T>)

    QAbstractXmlForwardIteratorPrivate *d_ptr; /* Currently not used. */
};

/* The namespace QPatternist and its members are internal, not part of the public API, and
 * unsupported. Using them leads to undefined behavior. */
namespace QPatternist
{
    class DeduplicateIterator;

    template<typename InputType,
             typename OutputType,
             typename Derived,
             typename ListType = QList<InputType> >
    class ListIteratorPlatform : public QAbstractXmlForwardIterator<OutputType>
    {
        /* This declaration is a workaround for a set of GCC versions on OS X,
         * amongst others powerpc-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1. In
         * DeduplicateIterator, it fails to see the protected inheritance. */
        friend class DeduplicateIterator;

    public:
        virtual OutputType next()
        {
            if(m_position == -1)
                return OutputType();

            if(m_position == m_list.count())
            {
                m_position = -1;
                m_current = OutputType();
                return OutputType();
            }

            m_current = static_cast<const Derived *>(this)->inputToOutputItem(m_list.at(m_position));
            ++m_position;
            return m_current;
        }

        virtual OutputType current() const
        {
            return m_current;
        }

        virtual qint64 position() const
        {
            return m_position;
        }

        virtual qint64 count()
        {
            return m_list.count();
        }

        virtual typename QAbstractXmlForwardIterator<OutputType>::Ptr copy() const
        {
            return QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<OutputType> >(new ListIteratorPlatform<InputType, OutputType, Derived, ListType>(m_list));
        }

    protected:
        inline ListIteratorPlatform(const ListType &list) : m_list(list)
                                                           , m_position(0)
        {
        }

        const ListType  m_list;
        qint64          m_position;
        OutputType      m_current;
    };

    template<typename T,
             typename ListType = QList<T> >
    class ListIterator : public ListIteratorPlatform<T, T, ListIterator<T, ListType>, ListType>
    {
	/*
	 * This declaration is needed for MSVC 2005, 14.00.50727.42 for 80x86.
	 */
	friend class IteratorVector;

        using ListIteratorPlatform<T, T, ListIterator<T, ListType>, ListType>::m_list;

        static inline QVector<T> toVector(const QVector<T> &vector)
        {
            return vector;
        }

        static inline QVector<T> toVector(const QList<T> &list)
        {
            return list.toVector();
        }

        static inline QList<T> toList(const QVector<T> &vector)
        {
            return vector.toList();
        }

        static inline QList<T> toList(const QList<T> &list)
        {
            return list;
        }

    public:
        inline ListIterator(const ListType &list) : ListIteratorPlatform<T, T, ListIterator<T, ListType>, ListType>(list)
        {
        }

        virtual QList<T> toList()
        {
            return toList(m_list);
        }

        virtual QVector<T> toVector()
        {
            return toVector(m_list);
        }

    private:
        inline const T &inputToOutputItem(const T &inputType) const
        {
            return inputType;
        }
        friend class ListIteratorPlatform<T, T, ListIterator<T, ListType>, ListType>;

        // needed for MSVC 2005
        friend class DeduplicateIterator;
    };

    template<typename T>
    inline
    typename QAbstractXmlForwardIterator<T>::Ptr
    makeListIterator(const QList<T> &list)
    {
        return typename ListIterator<T>::Ptr(new ListIterator<T>(list));
    }

    template<typename T>
    inline
    typename QAbstractXmlForwardIterator<T>::Ptr
    makeVectorIterator(const QVector<T> &vector)
    {
        return typename ListIterator<T, QVector<T> >::Ptr(new ListIterator<T, QVector<T> >(vector));
    }
}

template<typename T>
QList<T> QAbstractXmlForwardIterator<T>::toList()
{
    QList<T> result;
    T item(next());

    while(!qIsForwardIteratorEnd(item))
    {
        result.append(item);
        item = next();
    }

    return result;
}

template<typename T>
qint64 QAbstractXmlForwardIterator<T>::count()
{
    qint64 retval = 0;

    while(!qIsForwardIteratorEnd(next()))
        ++retval;

    return retval;
}

template<typename T>
typename QAbstractXmlForwardIterator<T>::Ptr QAbstractXmlForwardIterator<T>::toReversed()
{
    T item(next());
    QList<T> result;

    while(!qIsForwardIteratorEnd(item))
    {
        result.prepend(item);
        item = next();
    }

    return QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<T> >(new QPatternist::ListIterator<T>(result));
}

template<typename T>
T QAbstractXmlForwardIterator<T>::last()
{
    T item(next());

    while(!qIsForwardIteratorEnd(item))
        item = next();

    return item;
}

template<typename T>
typename QAbstractXmlForwardIterator<T>::Ptr QAbstractXmlForwardIterator<T>::copy() const
{
    Q_ASSERT_X(false, Q_FUNC_INFO,
               "This function is internal, unsupported, and should never be called.");
    return typename QAbstractXmlForwardIterator<T>::Ptr();
}

template<typename T>
bool QAbstractXmlForwardIterator<T>::isEmpty()
{
    return qIsForwardIteratorEnd(next());
}

template<typename T>
qint64 QAbstractXmlForwardIterator<T>::sizeHint() const
{
    Q_ASSERT_X(false, Q_FUNC_INFO, "This function is currently not expected to be used.");
    return -1;
}

QT_END_NAMESPACE

QT_END_HEADER

#endif