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39 
40 #include "qcommonsequencetypes_p.h"
41 #include "qatomicstring_p.h"
42 
43 #include "qsimplecontentconstructor_p.h"
44 
45 QT_BEGIN_NAMESPACE
46 
47 using namespace QPatternist;
48 
SimpleContentConstructor(const Expression::Ptr & operand)49 SimpleContentConstructor::SimpleContentConstructor(const Expression::Ptr &operand) : SingleContainer(operand)
50 {
51 }
52 
evaluateSingleton(const DynamicContext::Ptr & context) const53 Item SimpleContentConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
54 {
55     const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
56     Item next(it->next());
57     QString result;
58 
59     if(next)
60     {
61         result = next.stringValue();
62         next = it->next();
63     }
64     else
65         return Item();
66 
67     while(next)
68     {
69         result += QLatin1Char(' ');
70         result += next.stringValue();
71         next = it->next();
72     }
73 
74     return AtomicString::fromValue(result);
75 }
76 
compress(const StaticContext::Ptr & context)77 Expression::Ptr SimpleContentConstructor::compress(const StaticContext::Ptr &context)
78 {
79     const Expression::Ptr me(SingleContainer::compress(context));
80 
81     if(me.data() == this)
82     {
83         /* Optimization: if we will evaluate to a single string, we're not
84          * necessary. */
85         if(CommonSequenceTypes::ExactlyOneString->matches(m_operand->staticType()))
86             return m_operand;
87     }
88 
89     return me;
90 }
91 
expectedOperandTypes() const92 SequenceType::List SimpleContentConstructor::expectedOperandTypes() const
93 {
94     SequenceType::List result;
95     result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);
96     return result;
97 }
98 
staticType() const99 SequenceType::Ptr SimpleContentConstructor::staticType() const
100 {
101     if(m_operand->staticType()->cardinality().allowsEmpty())
102         return CommonSequenceTypes::ZeroOrOneString;
103     else
104         return CommonSequenceTypes::ExactlyOneString;
105 }
106 
accept(const ExpressionVisitor::Ptr & visitor) const107 ExpressionVisitorResult::Ptr SimpleContentConstructor::accept(const ExpressionVisitor::Ptr &visitor) const
108 {
109     return visitor->visit(this);
110 }
111 
112 QT_END_NAMESPACE
113