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, 297 insertions, 0 deletions

diff --git a/src/xmlpatterns/expr/qgeneralcomparison.cpp b/src/xmlpatterns/expr/qgeneralcomparison.cpp
new file mode 100644
index 0000000..a6d6399
--- /dev/null
+++ b/src/xmlpatterns/expr/qgeneralcomparison.cpp
@@ -0,0 +1,297 @@
+/****************************************************************************
+**
+** 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 "qebvextractor_p.h"
+#include "qitem_p.h"
+#include "qliteral_p.h"
+#include "qoptimizationpasses_p.h"
+#include "quntypedatomicconverter_p.h"
+#include "qvaluecomparison_p.h"
+
+#include "qgeneralcomparison_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+GeneralComparison::GeneralComparison(const Expression::Ptr &op1,
+                                     const AtomicComparator::Operator op,
+                                     const Expression::Ptr &op2,
+                                     const bool isBackwardsCompat) : PairContainer(op1, op2)
+                                                                   , m_operator(op)
+                                                                   , m_isBackwardsCompat(isBackwardsCompat)
+{
+}
+
+bool GeneralComparison::generalCompare(const Item &op1,
+                                       const Item &op2,
+                                       const DynamicContext::Ptr &context) const
+{
+    Q_ASSERT(op1);
+    Q_ASSERT(op2);
+
+    if(comparator())
+        return compare(op1, op2, comparator(), m_operator);
+
+    Expression::Ptr a1(new Literal(op1));
+    Expression::Ptr a2(new Literal(op2));
+
+    const AtomicComparator::Ptr comp(fetchGeneralComparator(a1, a2, context));
+    /* The fetchGeneralComparator call may rewrite a1 and/or a2. */
+    Q_ASSERT(a1);
+    Q_ASSERT(a2);
+    Q_ASSERT(comp);
+
+    return compare(a1->evaluateSingleton(context),
+                   a2->evaluateSingleton(context),
+                   comp,
+                   m_operator);
+}
+
+bool GeneralComparison::evaluateEBV(const DynamicContext::Ptr &context) const
+{
+    const Item::Iterator::Ptr it1(m_operand1->evaluateSequence(context));
+    Item item1(it1->next());
+
+    if(!item1)
+        return false;
+
+    const Item::Iterator::Ptr it2(m_operand2->evaluateSequence(context));
+    Item::List cache;
+    Item item2;
+
+    while(true)
+    {
+        item2 = it2->next();
+        if(!item2)
+            break;
+
+        if(generalCompare(item1, item2, context))
+            return true;
+
+        cache.append(item2);
+    }
+
+    while(true)
+    {
+        item1 = it1->next();
+
+        if(!item1)
+            return false;
+
+        const Item::List::const_iterator end(cache.constEnd());
+        Item::List::const_iterator it(cache.constBegin());
+
+        for(; it != end; ++it)
+            if(generalCompare(item1, *it, context))
+                return true;
+    }
+
+    Q_ASSERT(false);
+    return false;
+}
+
+Expression::Ptr GeneralComparison::compress(const StaticContext::Ptr &context)
+{
+    const Expression::Ptr me(PairContainer::compress(context));
+
+    if(me != this)
+        return me;
+
+    if(ValueComparison::isCaseInsensitiveCompare(m_operand1, m_operand2))
+        useCaseInsensitiveComparator();
+
+    return me;
+}
+
+Expression::Ptr GeneralComparison::typeCheck(const StaticContext::Ptr &context,
+                                             const SequenceType::Ptr &reqType)
+{
+
+    const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
+
+    const ItemType::Ptr t1(m_operand1->staticType()->itemType());
+    const ItemType::Ptr t2(m_operand2->staticType()->itemType());
+
+    if(*CommonSequenceTypes::Empty == *t1 ||
+       *CommonSequenceTypes::Empty == *t2)
+    {
+        return wrapLiteral(CommonValues::BooleanFalse, context, this);
+    }
+
+    if(*BuiltinTypes::xsAnyAtomicType == *t1 ||
+       *BuiltinTypes::xsAnyAtomicType == *t2)
+        return me;
+
+    prepareComparison(fetchGeneralComparator(m_operand1, m_operand2, context));
+
+    if(!m_operand1->staticType()->cardinality().allowsMany() &&
+       !m_operand2->staticType()->cardinality().allowsMany())
+    {
+        /* Rewrite to a ValueComparison whose operands uses typing rules
+         * as for an general comparison(that's what's done above). */
+        return rewrite(Expression::Ptr(new ValueComparison(m_operand1,
+                                                           m_operator,
+                                                           m_operand2))->typeCheck(context, reqType),
+                       context);
+    }
+    else
+        return me;
+}
+
+void GeneralComparison::updateType(ItemType::Ptr &type,
+                                   const Expression::Ptr &source)
+{
+    type = source->staticType()->itemType();
+}
+
+AtomicComparator::Ptr GeneralComparison::fetchGeneralComparator(Expression::Ptr &op1,
+                                                                Expression::Ptr &op2,
+                                                                const ReportContext::Ptr &context) const
+{
+    ItemType::Ptr t1(op1->staticType()->itemType());
+    ItemType::Ptr t2(op2->staticType()->itemType());
+
+    /* a. "If one of the atomic values is an instance of xs:untypedAtomic and
+     *    the other is an instance of a numeric type, then the xs:untypedAtomic
+     *    value is cast to the type xs:double." */
+    if(BuiltinTypes::numeric->xdtTypeMatches(t1) &&
+       BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2))
+    {
+        op2 = Expression::Ptr(new UntypedAtomicConverter(op2, BuiltinTypes::xsDouble));
+
+        /* The types might have changed, reload. */
+        updateType(t2, op2);
+    }
+    else if(BuiltinTypes::numeric->xdtTypeMatches(t2) &&
+            BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1))
+    {
+        op1 = Expression::Ptr(new UntypedAtomicConverter(op1, BuiltinTypes::xsDouble));
+
+        /* The types might have changed, reload. */
+        updateType(t1, op1);
+    }
+    /* "If XPath 1.0 compatibility mode is true, a general comparison is
+     *  evaluated by applying the following rules, in order:
+     *  1. If either operand is a single atomic value that is an instance of
+     *  xs:boolean, then the other operand is converted to xs:boolean by taking
+     *  its effective boolean value."
+     *
+     * Notably, it's not conversion to boolean, it is EBV extraction.
+     */
+    else if(m_isBackwardsCompat && BuiltinTypes::xsBoolean->xdtTypeMatches(t1))
+    {
+        op2 = Expression::Ptr(new EBVExtractor(op2));
+        updateType(t2, op2);
+    }
+    else if(m_isBackwardsCompat && BuiltinTypes::xsBoolean->xdtTypeMatches(t2))
+    {
+        op1 = Expression::Ptr(new EBVExtractor(op1));
+        updateType(t1, op1);
+    }
+    /* b. "If one of the atomic values is an instance of xs:untypedAtomic and
+     *    the other is an instance of xs:untypedAtomic or xs:string, then the
+     *    xs:untypedAtomic value (or values) is (are) cast to the type xs:string."
+     *
+     * c. "If one of the atomic values is an instance of xs:untypedAtomic and the
+     *    other is not an instance of xs:string, xs:untypedAtomic, or any numeric
+     *    type, then the xs:untypedAtomic value is cast to the dynamic type of the
+     *    other value." */
+    else if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1) &&
+            !BuiltinTypes::xsString->xdtTypeMatches(t2) &&
+            !BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2) &&
+            !BuiltinTypes::xsAnyURI->xdtTypeMatches(t2))
+    {
+        op1 = Expression::Ptr(new UntypedAtomicConverter(op1, t2));
+        updateType(t1, op1);
+    }
+    else if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2) &&
+            !BuiltinTypes::xsString->xdtTypeMatches(t1) &&
+            !BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1) &&
+            !BuiltinTypes::xsAnyURI->xdtTypeMatches(t1))
+    {
+        op2 = Expression::Ptr(new UntypedAtomicConverter(op2, t1));
+        updateType(t2, op2);
+    }
+
+    /* d. "After performing the conversions described above, the atomic
+     *     values are compared using one of the value comparison operators
+     *     eq, ne, lt, le, gt, or ge, depending on whether the general comparison
+     *     operator was =, !=, <, <=, >, or >=. The values have the required
+     *     magnitude relationship if and only if the result of this value comparison
+     *     is true." */
+
+    return fetchComparator(t1, t2, context);
+}
+
+OptimizationPass::List GeneralComparison::optimizationPasses() const
+{
+    Q_ASSERT(!OptimizationPasses::comparisonPasses.isEmpty());
+    return OptimizationPasses::comparisonPasses;
+}
+
+SequenceType::List GeneralComparison::expectedOperandTypes() const
+{
+    SequenceType::List result;
+    result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);
+    result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);
+    return result;
+}
+
+SequenceType::Ptr GeneralComparison::staticType() const
+{
+    return CommonSequenceTypes::ExactlyOneBoolean;
+}
+
+ExpressionVisitorResult::Ptr GeneralComparison::accept(const ExpressionVisitor::Ptr &visitor) const
+{
+    return visitor->visit(this);
+}
+
+Expression::ID GeneralComparison::id() const
+{
+    return IDGeneralComparison;
+}
+
+QT_END_NAMESPACE