Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 170 insertions, 0 deletions

diff --git a/src/xmlpatterns/expr/qrangeexpression.cpp b/src/xmlpatterns/expr/qrangeexpression.cpp
new file mode 100644
index 0000000..b4d7e91
--- /dev/null
+++ b/src/xmlpatterns/expr/qrangeexpression.cpp
@@ -0,0 +1,170 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbuiltintypes_p.h"
+#include "qcommonsequencetypes_p.h"
+#include "qcommonvalues_p.h"
+#include "qgenericsequencetype_p.h"
+#include "qinteger_p.h"
+#include "qliteral_p.h"
+#include "qrangeiterator_p.h"
+
+#include "qrangeexpression_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+RangeExpression::RangeExpression(const Expression::Ptr &operand1,
+                                 const Expression::Ptr &operand2) : PairContainer(operand1, operand2)
+{
+}
+
+Item::Iterator::Ptr RangeExpression::evaluateSequence(const DynamicContext::Ptr &context) const
+{
+    const Item s(m_operand1->evaluateSingleton(context));
+
+    if(!s)
+        return CommonValues::emptyIterator;
+
+    const Item e(m_operand2->evaluateSingleton(context));
+    if(!e)
+        return CommonValues::emptyIterator;
+
+    const xsInteger start = s.as<Numeric>()->toInteger();
+    const xsInteger end = e.as<Numeric>()->toInteger();
+
+    if(start > end)
+        return CommonValues::emptyIterator;
+    else if(start == end)
+        return makeSingletonIterator(s);
+    else
+        return Item::Iterator::Ptr(new RangeIterator(start, RangeIterator::Forward, end));
+}
+
+Item RangeExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
+{
+    return m_operand1->evaluateSingleton(context);
+}
+
+SequenceType::List RangeExpression::expectedOperandTypes() const
+{
+    SequenceType::List result;
+    result.append(CommonSequenceTypes::ZeroOrOneInteger);
+    result.append(CommonSequenceTypes::ZeroOrOneInteger);
+    return result;
+}
+
+SequenceType::Ptr RangeExpression::staticType() const
+{
+    /* This logic makes the Cardinality more specific. */
+    Cardinality::Count from;
+    bool hasFrom;
+
+    if(m_operand1->is(IDIntegerValue))
+    {
+        from = m_operand1->as<Literal>()->item().as<Integer>()->toInteger();
+        hasFrom = true;
+    }
+    else
+    {
+        hasFrom = false;
+        from = 0;
+    }
+
+    /* We can't check whether to is -1 since maybe the user wrote -1. Hence
+     * hasTo is required. */
+    bool hasTo;
+    Cardinality::Count to;
+
+    if(m_operand2->is(IDIntegerValue))
+    {
+        const xsInteger asInt = m_operand2->as<Literal>()->item().as<Integer>()->toInteger();
+        to = asInt;
+
+        if(to == asInt)
+            hasTo = true;
+        else
+        {
+            /* Cardinality::Count is not the same as type xsInteger. We had overflow. */
+            to = -1;
+            hasTo = false;
+        }
+    }
+    else
+    {
+        to = -1;
+        hasTo = false;
+    }
+
+    if(hasTo && hasFrom)
+    {
+        if(from > to)
+        {
+            /* The query is incorrectly written, we'll evaluate to the empty sequence.
+             * Just return what's correct. */
+            return CommonSequenceTypes::ZeroOrMoreIntegers;
+        }
+        else
+        {
+            Cardinality::Count count = (to - from) + 1; /* + 1, since it's inclusive. */
+            return makeGenericSequenceType(BuiltinTypes::xsInteger, Cardinality::fromExact(count));
+        }
+    }
+    else
+    {
+        /* We can't do fromExact(from, -1) since the latter can evaluate to a value that actually is
+         * lower than from, although that unfortunately is very unlikely. */
+        return CommonSequenceTypes::ZeroOrMoreIntegers;
+    }
+}
+
+Expression::Properties RangeExpression::properties() const
+{
+    return Expression::DisableElimination;
+}
+
+ExpressionVisitorResult::Ptr RangeExpression::accept(const ExpressionVisitor::Ptr &visitor) const
+{
+    return visitor->visit(this);
+}
+
+QT_END_NAMESPACE