| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
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| ** GNU Lesser General Public License Usage |
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| ** General Public License version 3 as published by the Free Software |
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| ** packaging of this file. Please review the following information to |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
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| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| |
| #include "qatomictype_p.h" |
| #include "qitem_p.h" |
| #include "qboolean_p.h" |
| #include "qbuiltintypes_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qcommonvalues_p.h" |
| #include "qliteral_p.h" |
| |
| #include "qcastableas_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| using namespace QPatternist; |
| |
| CastableAs::CastableAs(const Expression::Ptr &operand, |
| const SequenceType::Ptr &tType) : SingleContainer(operand), |
| m_targetType(tType) |
| { |
| Q_ASSERT(tType); |
| Q_ASSERT(!tType->cardinality().allowsMany()); |
| Q_ASSERT(tType->itemType()->isAtomicType()); |
| } |
| |
| bool CastableAs::evaluateEBV(const DynamicContext::Ptr &context) const |
| { |
| Item item; |
| |
| if(m_operand->staticType()->cardinality().allowsMany()) |
| { |
| const Item::Iterator::Ptr it(m_operand->evaluateSequence(context)); |
| item = it->next(); |
| |
| if(it->next()) |
| return false; |
| } |
| else |
| item = m_operand->evaluateSingleton(context); |
| |
| if(item) |
| return !cast(item, context).as<AtomicValue>()->hasError(); |
| else |
| return m_targetType->cardinality().allowsEmpty(); |
| } |
| |
| Expression::Ptr CastableAs::compress(const StaticContext::Ptr &context) |
| { |
| const Expression::Ptr me(SingleContainer::compress(context)); |
| |
| if(me != this) /* We already managed to const fold, how convenient. */ |
| return me; |
| |
| const AtomicType::Ptr t(m_targetType->itemType()); |
| |
| const SequenceType::Ptr opType(m_operand->staticType()); |
| |
| /* Casting to these always succeeds, assuming the cardinality also matches, |
| * although the cardinality can fail. */ |
| if(( *t == *BuiltinTypes::xsString |
| || *t == *BuiltinTypes::xsUntypedAtomic |
| || *t == *opType->itemType()) |
| &&(m_targetType->cardinality().isMatch(opType->cardinality()))) |
| { |
| return wrapLiteral(CommonValues::BooleanTrue, context, this); |
| } |
| else |
| return me; |
| } |
| |
| Expression::Ptr CastableAs::typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType) |
| { |
| checkTargetType(context); |
| const Expression::Ptr me(SingleContainer::typeCheck(context, reqType)); |
| |
| return me; |
| if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType())) |
| { |
| const SequenceType::Ptr seqt(m_operand->staticType()); |
| /* We can cast a string literal, an xs:QName value, and an |
| * empty sequence(if empty is allowed), to xs:QName. */ |
| if(m_operand->is(IDStringValue) || |
| BuiltinTypes::xsQName->xdtTypeMatches(seqt->itemType()) || |
| (*seqt->itemType() == *CommonSequenceTypes::Empty && m_targetType->cardinality().allowsEmpty())) |
| { |
| return wrapLiteral(CommonValues::BooleanTrue, context, this)->typeCheck(context, reqType); |
| } |
| else |
| return wrapLiteral(CommonValues::BooleanFalse, context, this)->typeCheck(context, reqType); |
| } |
| else |
| { |
| /* Let the CastingPlatform look up its AtomicCaster. */ |
| prepareCasting(context, m_operand->staticType()->itemType()); |
| |
| return me; |
| } |
| } |
| |
| SequenceType::List CastableAs::expectedOperandTypes() const |
| { |
| SequenceType::List result; |
| result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes); |
| return result; |
| } |
| |
| SequenceType::Ptr CastableAs::staticType() const |
| { |
| return CommonSequenceTypes::ExactlyOneBoolean; |
| } |
| |
| ExpressionVisitorResult::Ptr CastableAs::accept(const ExpressionVisitor::Ptr &visitor) const |
| { |
| return visitor->visit(this); |
| } |
| |
| QT_END_NAMESPACE |