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41 
42 #include "qcommonsequencetypes_p.h"
43 #include "qatomicstring_p.h"
44 
45 #include "qsimplecontentconstructor_p.h"
46 
47 QT_BEGIN_NAMESPACE
48 
49 using namespace QPatternist;
50 
SimpleContentConstructor(const Expression::Ptr & operand)51 SimpleContentConstructor::SimpleContentConstructor(const Expression::Ptr &operand) : SingleContainer(operand)
52 {
53 }
54 
evaluateSingleton(const DynamicContext::Ptr & context) const55 Item SimpleContentConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
56 {
57     const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
58     Item next(it->next());
59     QString result;
60 
61     if(next)
62     {
63         result = next.stringValue();
64         next = it->next();
65     }
66     else
67         return Item();
68 
69     while(next)
70     {
71         result += QLatin1Char(' ');
72         result += next.stringValue();
73         next = it->next();
74     }
75 
76     return AtomicString::fromValue(result);
77 }
78 
compress(const StaticContext::Ptr & context)79 Expression::Ptr SimpleContentConstructor::compress(const StaticContext::Ptr &context)
80 {
81     const Expression::Ptr me(SingleContainer::compress(context));
82 
83     if(me.data() == this)
84     {
85         /* Optimization: if we will evaluate to a single string, we're not
86          * necessary. */
87         if(CommonSequenceTypes::ExactlyOneString->matches(m_operand->staticType()))
88             return m_operand;
89     }
90 
91     return me;
92 }
93 
expectedOperandTypes() const94 SequenceType::List SimpleContentConstructor::expectedOperandTypes() const
95 {
96     SequenceType::List result;
97     result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);
98     return result;
99 }
100 
staticType() const101 SequenceType::Ptr SimpleContentConstructor::staticType() const
102 {
103     if(m_operand->staticType()->cardinality().allowsEmpty())
104         return CommonSequenceTypes::ZeroOrOneString;
105     else
106         return CommonSequenceTypes::ExactlyOneString;
107 }
108 
accept(const ExpressionVisitor::Ptr & visitor) const109 ExpressionVisitorResult::Ptr SimpleContentConstructor::accept(const ExpressionVisitor::Ptr &visitor) const
110 {
111     return visitor->visit(this);
112 }
113 
114 QT_END_NAMESPACE
115