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| ** 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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| |
| #include "qabstractfloat_p.h" |
| #include "qboolean_p.h" |
| #include "qbuiltintypes_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qemptysequence_p.h" |
| #include "qfirstitempredicate_p.h" |
| #include "qgenericsequencetype_p.h" |
| #include "qitemmappingiterator_p.h" |
| #include "qliteral_p.h" |
| #include "qpatternistlocale_p.h" |
| #include "qtruthpredicate_p.h" |
| |
| #include "qgenericpredicate_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| using namespace QPatternist; |
| |
| GenericPredicate::GenericPredicate(const Expression::Ptr &sourceExpression, |
| const Expression::Ptr &predicate) : PairContainer(sourceExpression, |
| predicate) |
| { |
| } |
| |
| Expression::Ptr GenericPredicate::create(const Expression::Ptr &sourceExpression, |
| const Expression::Ptr &predicateExpression, |
| const StaticContext::Ptr &context, |
| const QSourceLocation &location) |
| { |
| Q_ASSERT(sourceExpression); |
| Q_ASSERT(predicateExpression); |
| Q_ASSERT(context); |
| const ItemType::Ptr type(predicateExpression->staticType()->itemType()); |
| |
| if(predicateExpression->is(IDIntegerValue) && |
| predicateExpression->as<Literal>()->item().as<Numeric>()->toInteger() == 1) |
| { /* Handle [1] */ |
| return createFirstItem(sourceExpression); |
| } |
| else if(BuiltinTypes::numeric->xdtTypeMatches(type)) |
| { /* A numeric predicate, other than [1]. */ |
| /* TODO at somepoint we'll return a specialized expr here, NumericPredicate or so. |
| * Dependency analysis is a bit tricky, since the contained expression can depend on |
| * some loop component. */ |
| return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression)); |
| } |
| else if(*CommonSequenceTypes::Empty == *type) |
| { |
| return EmptySequence::create(predicateExpression.data(), context); |
| } |
| else if(*BuiltinTypes::item == *type || |
| *BuiltinTypes::xsAnyAtomicType == *type) |
| { |
| /* The type couldn't be narrowed at compile time, so we use |
| * a generic predicate. This check is before the CommonSequenceTypes::EBV check, |
| * because the latter matches these types as well. */ |
| return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression)); |
| } |
| else if(CommonSequenceTypes::EBV->itemType()->xdtTypeMatches(type)) |
| { |
| return Expression::Ptr(new TruthPredicate(sourceExpression, predicateExpression)); |
| } |
| else |
| { |
| context->error(QtXmlPatterns::tr("A value of type %1 cannot be a " |
| "predicate. A predicate must have " |
| "either a numeric type or an " |
| "Effective Boolean Value type.") |
| .arg(formatType(context->namePool(), |
| sourceExpression->staticType())), |
| ReportContext::FORG0006, location); |
| return Expression::Ptr(); /* Silence compiler warning. */ |
| } |
| } |
| |
| Expression::Ptr GenericPredicate::createFirstItem(const Expression::Ptr &sourceExpression) |
| |
| { |
| return Expression::Ptr(new FirstItemPredicate(sourceExpression)); |
| } |
| |
| Item GenericPredicate::mapToItem(const Item &item, |
| const DynamicContext::Ptr &context) const |
| { |
| const Item::Iterator::Ptr it(m_operand2->evaluateSequence(context)); |
| const Item pcateItem(it->next()); |
| |
| if(!pcateItem) |
| return Item(); /* The predicate evaluated to the empty sequence */ |
| else if(pcateItem.isNode()) |
| return item; |
| /* Ok, now it must be an AtomicValue */ |
| else if(BuiltinTypes::numeric->xdtTypeMatches(pcateItem.type())) |
| { /* It's a positional predicate. */ |
| if(it->next()) |
| { |
| context->error(QtXmlPatterns::tr("A positional predicate must " |
| "evaluate to a single numeric " |
| "value."), |
| ReportContext::FORG0006, this); |
| return Item(); |
| } |
| |
| if(Double::isEqual(static_cast<xsDouble>(context->contextPosition()), |
| pcateItem.as<Numeric>()->toDouble())) |
| { |
| return item; |
| } |
| else |
| return Item(); |
| } |
| else if(Boolean::evaluateEBV(pcateItem, it, context)) /* It's a truth predicate. */ |
| return item; |
| else |
| return Item(); |
| } |
| |
| Item::Iterator::Ptr GenericPredicate::evaluateSequence(const DynamicContext::Ptr &context) const |
| { |
| const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context)); |
| const DynamicContext::Ptr newContext(context->createFocus()); |
| newContext->setFocusIterator(focus); |
| |
| return makeItemMappingIterator<Item>(ConstPtr(this), |
| focus, |
| newContext); |
| } |
| |
| Item GenericPredicate::evaluateSingleton(const DynamicContext::Ptr &context) const |
| { |
| const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context)); |
| const DynamicContext::Ptr newContext(context->createFocus()); |
| newContext->setFocusIterator(focus); |
| return mapToItem(focus->next(), newContext); |
| } |
| |
| SequenceType::List GenericPredicate::expectedOperandTypes() const |
| { |
| SequenceType::List result; |
| result.append(CommonSequenceTypes::ZeroOrMoreItems); |
| result.append(CommonSequenceTypes::ZeroOrMoreItems); |
| return result; |
| } |
| |
| SequenceType::Ptr GenericPredicate::staticType() const |
| { |
| const SequenceType::Ptr type(m_operand1->staticType()); |
| return makeGenericSequenceType(type->itemType(), |
| type->cardinality() | Cardinality::zeroOrOne()); |
| } |
| |
| ExpressionVisitorResult::Ptr GenericPredicate::accept(const ExpressionVisitor::Ptr &visitor) const |
| { |
| return visitor->visit(this); |
| } |
| |
| ItemType::Ptr GenericPredicate::newFocusType() const |
| { |
| return m_operand1->staticType()->itemType(); |
| } |
| |
| Expression::Properties GenericPredicate::properties() const |
| { |
| return CreatesFocusForLast; |
| } |
| |
| QString GenericPredicate::description() const |
| { |
| return QLatin1String("predicate"); |
| } |
| |
| Expression::ID GenericPredicate::id() const |
| { |
| return IDGenericPredicate; |
| } |
| |
| QT_END_NAMESPACE |
