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Diffstat (limited to 'src/xmlpatterns/expr/qcastingplatform.cpp')
| -rw-r--r-- | src/xmlpatterns/expr/qcastingplatform.cpp | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qcastingplatform.cpp b/src/xmlpatterns/expr/qcastingplatform.cpp new file mode 100644 index 0000000000..9e96fd8cf6 --- /dev/null +++ b/src/xmlpatterns/expr/qcastingplatform.cpp @@ -0,0 +1,219 @@ +/**************************************************************************** +** +** 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)); +} + |