Long live Qt!

1 files changed, 219 insertions, 0 deletions

diff --git a/src/xmlpatterns/expr/qcastingplatform.cpp b/src/xmlpatterns/expr/qcastingplatform.cpp
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+++ b/src/xmlpatterns/expr/qcastingplatform.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/**
+ * @file
+ * @short This file is included by qcastingplatform_p.h.
+ * If you need includes in this file, put them in CasttingPlatform.h, outside of the namespace.
+ */
+
+template <typename TSubClass, const bool issueError>
+Item CastingPlatform<TSubClass, issueError>::castWithCaster(const Item &sourceValue,
+                                                            const AtomicCaster::Ptr &caster,
+                                                            const ReportContext::Ptr &context) const
+{
+    Q_ASSERT(sourceValue);
+    Q_ASSERT(caster);
+    Q_ASSERT(context);
+
+    const Item retval(caster->castFrom(sourceValue, context));
+
+    if(issueError)
+    {
+        if(retval.template as<AtomicValue>()->hasError())
+        {
+            issueCastError(retval, sourceValue, context);
+            return Item();
+        }
+        else
+            return retval;
+    }
+    else
+        return retval;
+}
+
+template <typename TSubClass, const bool issueError>
+Item CastingPlatform<TSubClass, issueError>::cast(const Item &sourceValue,
+                                                  const ReportContext::Ptr &context) const
+{
+    Q_ASSERT(sourceValue);
+    Q_ASSERT(context);
+    Q_ASSERT(targetType());
+
+    if(m_caster)
+        return castWithCaster(sourceValue, m_caster, context);
+    else
+    {
+        bool castImpossible = false;
+        const AtomicCaster::Ptr caster(locateCaster(sourceValue.type(), context, castImpossible));
+
+        if(!issueError && castImpossible)
+        {
+            /* If we're supposed to issue an error(issueError) then this
+             * line will never be reached, because locateCaster() will in
+             * that case throw. */
+            return ValidationError::createError();
+        }
+        else
+            return castWithCaster(sourceValue, caster, context);
+    }
+}
+
+template <typename TSubClass, const bool issueError>
+bool CastingPlatform<TSubClass, issueError>::prepareCasting(const ReportContext::Ptr &context,
+                                                            const ItemType::Ptr &sourceType)
+{
+    Q_ASSERT(sourceType);
+    Q_ASSERT(context);
+
+    if(*sourceType == *BuiltinTypes::xsAnyAtomicType ||
+       *sourceType == *BuiltinTypes::item ||
+       *sourceType == *CommonSequenceTypes::Empty ||
+       *sourceType == *BuiltinTypes::numeric)
+        return true; /* The type could not be narrowed better than xs:anyAtomicType
+                        or numeric at compile time. We'll do lookup at runtime instead. */
+
+    bool castImpossible = false;
+    m_caster = locateCaster(sourceType, context, castImpossible);
+
+    return !castImpossible;
+}
+
+template <typename TSubClass, const bool issueError>
+AtomicCaster::Ptr CastingPlatform<TSubClass, issueError>::locateCaster(const ItemType::Ptr &sourceType,
+                                                                       const ReportContext::Ptr &context,
+                                                                       bool &castImpossible) const
+{
+    Q_ASSERT(sourceType);
+    Q_ASSERT(targetType());
+
+    const AtomicCasterLocator::Ptr locator(static_cast<AtomicType *>(
+            targetType().data())->casterLocator());
+    if(!locator)
+    {
+        if(issueError)
+        {
+            context->error(QtXmlPatterns::tr("No casting is possible with %1 as the target type.")
+                                        .arg(formatType(context->namePool(), targetType())),
+                                       ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
+        }
+        else
+            castImpossible = true;
+
+        return AtomicCaster::Ptr();
+    }
+
+    const AtomicCaster::Ptr caster(static_cast<const AtomicType *>(sourceType.data())->accept(locator, static_cast<const TSubClass *>(this)));
+    if(!caster)
+    {
+        if(issueError)
+        {
+            context->error(QtXmlPatterns::tr("It is not possible to cast from %1 to %2.")
+                                            .arg(formatType(context->namePool(), sourceType))
+                                            .arg(formatType(context->namePool(), targetType())),
+                                       ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
+        }
+        else
+            castImpossible = true;
+
+        return AtomicCaster::Ptr();
+    }
+
+    return caster;
+}
+
+template <typename TSubClass, const bool issueError>
+void CastingPlatform<TSubClass, issueError>::checkTargetType(const ReportContext::Ptr &context) const
+{
+    Q_ASSERT(context);
+
+    const ItemType::Ptr tType(targetType());
+    Q_ASSERT(tType);
+    Q_ASSERT(tType->isAtomicType());
+    const AtomicType::Ptr asAtomic(tType);
+
+    /* This catches casting to xs:NOTATION and xs:anyAtomicType. */
+    if(asAtomic->isAbstract())
+    {
+        context->error(QtXmlPatterns::tr("Casting to %1 is not possible because it "
+                                     "is an abstract type, and can therefore never be instantiated.")
+                                .arg(formatType(context->namePool(), tType)),
+                          ReportContext::XPST0080,
+                          static_cast<const TSubClass*>(this));
+    }
+}
+
+template <typename TSubClass, const bool issueError>
+void CastingPlatform<TSubClass, issueError>::issueCastError(const Item &validationError,
+                                                            const Item &sourceValue,
+                                                            const ReportContext::Ptr &context) const
+{
+    Q_ASSERT(validationError);
+    Q_ASSERT(context);
+    Q_ASSERT(validationError.isAtomicValue());
+    Q_ASSERT(validationError.template as<AtomicValue>()->hasError());
+
+    const ValidationError::Ptr err(validationError.template as<ValidationError>());
+    QString msg(err->message());
+
+    if(msg.isNull())
+    {
+        msg = QtXmlPatterns::tr("It's not possible to cast the value %1 of type %2 to %3")
+                 .arg(formatData(sourceValue.stringValue()))
+                 .arg(formatType(context->namePool(), sourceValue.type()))
+                 .arg(formatType(context->namePool(), targetType()));
+    }
+    else
+    {
+        Q_ASSERT(!msg.isEmpty());
+        msg = QtXmlPatterns::tr("Failure when casting from %1 to %2: %3")
+                 .arg(formatType(context->namePool(), sourceValue.type()))
+                 .arg(formatType(context->namePool(), targetType()))
+                 .arg(msg);
+    }
+
+    /* If m_errorCode is FORG0001, we assume our sub-classer doesn't have a
+     * special wish about error code, so then we use the error object's code.
+     */
+    context->error(msg, m_errorCode == ReportContext::FORG0001 ? err->errorCode() : m_errorCode,
+                   static_cast<const TSubClass*>(this));
+}
+