| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| ** Alternatively, this file may be used under the terms of the GNU |
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| ****************************************************************************/ |
| |
| #include "qitem_p.h" |
| #include "qbuiltintypes_p.h" |
| #include "qcardinalityverifier_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qemptysequence_p.h" |
| #include "qgenericsequencetype_p.h" |
| #include "qliteral_p.h" |
| #include "qpatternistlocale_p.h" |
| #include "qnamespaceresolver_p.h" |
| #include "qqnameconstructor_p.h" |
| #include "qqnamevalue_p.h" |
| #include "qatomicstring_p.h" |
| #include "qvalidationerror_p.h" |
| |
| #include "qcastas_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| using namespace QPatternist; |
| |
| CastAs::CastAs(const Expression::Ptr &source, |
| const SequenceType::Ptr &tType) : SingleContainer(source), |
| m_targetType(tType) |
| { |
| Q_ASSERT(source); |
| Q_ASSERT(tType); |
| Q_ASSERT(!tType->cardinality().allowsMany()); |
| Q_ASSERT(tType->itemType()->isAtomicType()); |
| } |
| |
| Item CastAs::evaluateSingleton(const DynamicContext::Ptr &context) const |
| { |
| Q_ASSERT(context); |
| const Item val(m_operand->evaluateSingleton(context)); |
| |
| if(val) |
| return cast(val, context); |
| else |
| { |
| /* No item supplied, let's handle the cardinality part. */ |
| |
| if(m_targetType->cardinality().allowsEmpty()) |
| return Item(); |
| else |
| { |
| Q_ASSERT(context); |
| context->error(QtXmlPatterns::tr("Type error in cast, expected %1, " |
| "received %2.") |
| .arg(formatType(Cardinality::exactlyOne())) |
| .arg(formatType(Cardinality::empty())), |
| ReportContext::XPTY0004, this); |
| return Item(); |
| } |
| } |
| } |
| |
| Expression::Ptr CastAs::typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType) |
| { |
| checkTargetType(context); |
| const SequenceType::Ptr seqt(m_operand->staticType()); |
| ItemType::Ptr t(seqt->itemType()); |
| |
| /* Special case xs:QName */ |
| if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType())) |
| { |
| /* Ok, We're casting to xs:QName. */ |
| if(m_operand->is(IDStringValue)) /* A valid combination, let's do the cast. */ |
| return castToQName(context)->typeCheck(context, reqType); |
| else if(BuiltinTypes::xsQName->xdtTypeMatches(t)) |
| return m_operand->typeCheck(context, reqType); |
| else if(seqt->cardinality().isEmpty() && m_targetType->cardinality().allowsEmpty()) |
| return EmptySequence::create(this, context); |
| else if(!(seqt->cardinality().isEmpty() && !m_targetType->cardinality().allowsEmpty())) |
| { |
| context->error(QtXmlPatterns::tr("When casting to %1 or types " |
| "derived from it, the source " |
| "value must be of the same type, " |
| "or it must be a string literal. " |
| "Type %2 is not allowed.") |
| .arg(formatType(context->namePool(), BuiltinTypes::xsQName)) |
| .arg(formatType(context->namePool(), seqt)), |
| ReportContext::XPTY0004, this); |
| return Expression::Ptr(this); |
| } |
| } |
| |
| const Expression::Ptr me(SingleContainer::typeCheck(context, reqType)); |
| /* Type may have changed, such as that atomization has been applied. */ |
| t = m_operand->staticType()->itemType(); |
| |
| if(m_targetType->itemType()->xdtTypeMatches(t) && |
| !BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t) && |
| !BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t)) |
| { /* At least casting is superflorous. */ |
| if(m_operand->staticType()->cardinality().isMatch(m_targetType->cardinality())) |
| return m_operand; /* The whole cast expression is redundant. */ |
| else |
| { /* Only cardinality check is needed, rewrite to CardinalityVerifier. */ |
| return Expression::Ptr(new CardinalityVerifier(m_operand, |
| m_targetType->cardinality(), |
| ReportContext::FORG0001)); |
| } |
| } |
| |
| /* Let the CastingPlatform look up its AtomicCaster. */ |
| prepareCasting(context, t); |
| |
| return me; |
| } |
| |
| Expression::Ptr CastAs::compress(const StaticContext::Ptr &context) |
| { |
| /* Simplify casts to itself. */ |
| if(*m_targetType->itemType() == *m_operand->staticType()->itemType()) |
| return m_operand->compress(context); |
| else |
| return SingleContainer::compress(context); |
| } |
| |
| Expression::Ptr CastAs::castToQName(const StaticContext::Ptr &context) const |
| { |
| /* Apply the whitespace facet by calling trimmed(). */ |
| /* We can assume m_operand is an Expression because this is a requirement |
| * for casting to xs:QName. */ |
| const QString lexQName(m_operand->as<Literal>()->item().as<AtomicValue>()->stringValue().trimmed()); |
| |
| const QXmlName |
| expName(QNameConstructor::expandQName<StaticContext::Ptr, |
| ReportContext::FORG0001, |
| ReportContext::FONS0004>(lexQName, |
| context, |
| context->namespaceBindings(), this)); |
| return wrapLiteral(toItem(QNameValue::fromValue(context->namePool(), expName)), context, this); |
| } |
| |
| SequenceType::Ptr CastAs::staticType() const |
| { |
| if(m_operand->staticType()->cardinality().allowsEmpty()) |
| return m_targetType; |
| else |
| return makeGenericSequenceType(m_targetType->itemType(), |
| Cardinality::exactlyOne()); |
| } |
| |
| SequenceType::List CastAs::expectedOperandTypes() const |
| { |
| SequenceType::List result; |
| |
| if(m_targetType->cardinality().allowsEmpty()) |
| result.append(CommonSequenceTypes::ZeroOrOneAtomicType); |
| else |
| result.append(CommonSequenceTypes::ExactlyOneAtomicType); |
| |
| return result; |
| } |
| |
| ExpressionVisitorResult::Ptr CastAs::accept(const ExpressionVisitor::Ptr &visitor) const |
| { |
| return visitor->visit(this); |
| } |
| |
| QT_END_NAMESPACE |
