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

1 files changed, 271 insertions, 0 deletions

diff --git a/src/xmlpatterns/expr/qpath.cpp b/src/xmlpatterns/expr/qpath.cpp
new file mode 100644
index 0000000..73cf0d9
--- /dev/null
+++ b/src/xmlpatterns/expr/qpath.cpp
@@ -0,0 +1,271 @@
+/****************************************************************************
+**
+** 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 "qgenericsequencetype_p.h"
+#include "qnodesort_p.h"
+#include "qpatternistlocale_p.h"
+#include "qsequencemappingiterator_p.h"
+#include "qtypechecker_p.h"
+
+#include "qpath_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+Path::Path(const Expression::Ptr &operand1,
+           const Expression::Ptr &operand2,
+           const Kind kind) : PairContainer(operand1, operand2)
+                            , m_hasCreatedSorter(kind != RegularPath)
+                            , m_isLast(false)
+                            , m_checkXPTY0018(kind == RegularPath)
+                            , m_kind(kind)
+{
+}
+
+Item::Iterator::Ptr Path::mapToSequence(const Item &item,
+                                        const DynamicContext::Ptr &context) const
+{
+    /* item is the focus here. That is in <e/>/1, item is <e/>. However,
+     * we don't use it, since the context item is accessed through
+     * DynamicContext::focusIterator() and friends. */
+    Q_ASSERT(item);
+    Q_UNUSED(item); /* Needed when compiling in release mode. */
+    return m_operand2->evaluateSequence(context);
+}
+
+Item::Iterator::Ptr Path::evaluateSequence(const DynamicContext::Ptr &context) const
+{
+    /* Note, we use the old context for m_operand1. */
+    const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
+
+    const DynamicContext::Ptr focus(context->createFocus());
+    focus->setFocusIterator(source);
+
+    const Item::Iterator::Ptr result(makeSequenceMappingIterator<Item>(ConstPtr(this), source, focus));
+
+    if(m_checkXPTY0018)
+    {
+        /* This is an expensive code path, but it should happen very rarely. */
+
+        enum FoundItem
+        {
+            FoundNone,
+            FoundNode,
+            FoundAtomicValue
+        } hasFound = FoundNone;
+
+        Item::List whenChecked;
+
+        Item next(result->next());
+
+        while(next)
+        {
+            const FoundItem found = next.isAtomicValue() ? FoundAtomicValue : FoundNode;
+
+            if(hasFound != FoundNone && hasFound != found)
+            {
+                /* It's an atomic value and we've already found a node. Mixed content. */
+                context->error(QtXmlPatterns::tr("The last step in a path must contain either nodes "
+                                                 "or atomic values. It cannot be a mixture between the two."),
+                               ReportContext::XPTY0018, this);
+            }
+            else
+                hasFound = found;
+
+            whenChecked.append(next);
+            next = result->next();
+        }
+
+        return makeListIterator(whenChecked);
+    }
+    else
+        return result;
+}
+
+Item Path::evaluateSingleton(const DynamicContext::Ptr &context) const
+{
+    /* This function is called if both operands' cardinality is exactly-one. Therefore
+     * we manually go forward in the focus by calling next().
+     *
+     * We don't check for XPTY0018, only in evaluateSequence(), since if we're guaranteed
+     * to evaluate to one item, we can only evaluate to one node or one atomic value.
+     */
+
+    /* Note, we use the old context for m_operand1. */
+    const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
+
+    const DynamicContext::Ptr focus(context->createFocus());
+    focus->setFocusIterator(source);
+
+    /* This test is needed because if the focus is empty, we don't want to(nor can't) evaluate
+     * the next step. */
+    // TODO Why are we at all invoked then?
+    if(source->next())
+        return m_operand2->evaluateSingleton(focus);
+    else
+        return Item();
+}
+
+void Path::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
+{
+    /* Note, we use the old context for m_operand1. */
+    const Item::Iterator::Ptr source(m_operand1->evaluateSequence(context));
+
+    const DynamicContext::Ptr focus(context->createFocus());
+    focus->setFocusIterator(source);
+
+    while(source->next())
+        m_operand2->evaluateToSequenceReceiver(focus);
+}
+
+Expression::Ptr Path::compress(const StaticContext::Ptr &context)
+{
+    const Expression::Ptr me(PairContainer::compress(context));
+
+    /* "./expr" is by now equal to "expr" since we've done
+     * focus/type checks, and a node sorter has been inserted. */
+    if(m_operand1->is(IDContextItem))
+        return m_operand2;
+
+    /* We do this as late as we can, such that we pick up the most recent type
+     * from the operand. */
+    if(m_isLast && m_kind != XSLTForEach && m_operand2->staticType()->itemType() == BuiltinTypes::item)
+        m_checkXPTY0018 = true;
+
+    return me;
+}
+
+Expression::Ptr Path::typeCheck(const StaticContext::Ptr &context,
+                                const SequenceType::Ptr &reqType)
+{
+    m_operand2->announceFocusType(newFocusType());
+
+    /* Here we apply the function conversion first, and with the error code
+     * that we want -- XPTY0019 instead of XPTY0004. Unfortunately
+     * PairContainer::typeCheck() will do the type check again, which is
+     * redundant in the case of when we're not XSLTForEach.
+     *
+     * If we're XSLTForEach, it means we're a synthetic "map" expression for
+     * implementing various XSL-T expressions, and hence don't have the
+     * constraint of XPTY0019.
+     *
+     * It's important that typeCheck() is run for the operands(of course), and the call to
+     * PairContainer::typeCheck() ensures that below, in the case that we're XSL-T code.
+     *
+     * The type we expect, CommonSequenceTypes::ZeroOrMoreNodes() needs to be in sync with
+     * what we return in expectedOperandTypes(). */
+    if(m_kind != XSLTForEach)
+    {
+        m_operand1 = TypeChecker::applyFunctionConversion(m_operand1,
+                                                          CommonSequenceTypes::ZeroOrMoreNodes,
+                                                          context,
+                                                          m_kind == ForApplyTemplate ? ReportContext::XTTE0520
+                                                                                     : ReportContext::XPTY0019);
+    }
+
+    /* If our step ends with atomic values, we cannot sort.
+     *
+     * We must smack the NodeSortExpression ontop before calling typeCheck(), since the latter
+     * may insert an Atomizer, as possibly mandated by reqType. By doing it after, the Atomizer
+     * will be a parent to NodeSortExpression, as opposed to a child.
+     */
+    if(!m_hasCreatedSorter)
+    {
+        m_hasCreatedSorter = true;
+
+        return NodeSortExpression::wrapAround(Expression::Ptr(this), context)->typeCheck(context, reqType);
+    }
+    else
+        return PairContainer::typeCheck(context, reqType);
+}
+
+SequenceType::List Path::expectedOperandTypes() const
+{
+    SequenceType::List result;
+
+    /* This value needs to be in sync with what we pass to
+     * applyFunctionConversion() in typeCheck() above.
+     *
+     * We don't have the XPTY0019 restriction when we're synthetic XSL-T code.
+     */
+    if(m_kind == XSLTForEach)
+        result.append(CommonSequenceTypes::ZeroOrMoreItems);
+    else
+        result.append(CommonSequenceTypes::ZeroOrMoreNodes);
+
+    result.append(CommonSequenceTypes::ZeroOrMoreItems);
+    return result;
+}
+
+SequenceType::Ptr Path::staticType() const
+{
+    const SequenceType::Ptr opType(m_operand2->staticType());
+
+    /* For each parent step, we evaluate the child step. So multiply the two
+     * cardinalities. */
+    return makeGenericSequenceType(opType->itemType(),
+                                   m_operand1->staticType()->cardinality() * opType->cardinality());
+}
+
+ExpressionVisitorResult::Ptr Path::accept(const ExpressionVisitor::Ptr &visitor) const
+{
+    return visitor->visit(this);
+}
+
+Expression::Properties Path::properties() const
+{
+    return CreatesFocusForLast | ((m_operand1->properties() | m_operand2->properties()) & (RequiresCurrentItem | DisableElimination));
+}
+
+ItemType::Ptr Path::newFocusType() const
+{
+    return m_operand1->staticType()->itemType();
+}
+
+Expression::ID Path::id() const
+{
+    return IDPath;
+}
+
+QT_END_NAMESPACE