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39
40#include "qinteger_p.h"
41
42#include "qrangeiterator_p.h"
43
44QT_BEGIN_NAMESPACE
45
46using namespace QPatternist;
47
48RangeIterator::RangeIterator(const xsInteger start,
49 const Direction direction,
50 const xsInteger end)
51 : m_start(start),
52 m_end(end),
53 m_position(0),
54 m_count(start),
55 m_direction(direction),
56 m_increment(m_direction == Forward ? 1 : -1)
57{
58 Q_ASSERT(m_start < m_end);
59 Q_ASSERT(m_direction == Backward || m_direction == Forward);
60
61 if(m_direction == Backward)
62 {
63 qSwap(value1&: m_start, value2&: m_end);
64 m_count = m_start;
65 }
66}
67
68Item RangeIterator::next()
69{
70 if(m_position == -1)
71 return Item();
72 else if((m_direction == Forward && m_count > m_end) ||
73 (m_direction == Backward && m_count < m_end))
74 {
75 m_position = -1;
76 m_current.reset();
77 return Item();
78 }
79 else
80 {
81 m_current = Integer::fromValue(num: m_count);
82 m_count += m_increment;
83 ++m_position;
84 return m_current;
85 }
86}
87
88xsInteger RangeIterator::count()
89{
90 /* This complication is for handling that m_start & m_end may be reversed. */
91 xsInteger ret;
92
93 if(m_start < m_end)
94 ret = m_end - m_start;
95 else
96 ret = m_start - m_end;
97
98 return ret + 1;
99}
100
101Item::Iterator::Ptr RangeIterator::toReversed()
102{
103 return Item::Iterator::Ptr(new RangeIterator(m_start, Backward, m_end));
104}
105
106Item RangeIterator::current() const
107{
108 return m_current;
109}
110
111xsInteger RangeIterator::position() const
112{
113 return m_position;
114}
115
116Item::Iterator::Ptr RangeIterator::copy() const
117{
118 if(m_direction == Backward)
119 return Item::Iterator::Ptr(new RangeIterator(m_end, Backward, m_start));
120 else
121 return Item::Iterator::Ptr(new RangeIterator(m_start, Forward, m_end));
122}
123
124QT_END_NAMESPACE
125

source code of qtxmlpatterns/src/xmlpatterns/iterators/qrangeiterator.cpp