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https://github.com/jezhiggins/arabica
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64 lines
2.9 KiB
C++
64 lines
2.9 KiB
C++
#ifndef ARABICA_XPATHIC_XPATH_LOGICAL_HPP
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#define ARABICA_XPATHIC_XPATH_LOGICAL_HPP
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#include "xpath_value.hpp"
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namespace Arabica
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{
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namespace XPath
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{
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namespace impl
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{
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template<class string_type, class string_adaptor>
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class OrOperator : private BinaryExpression<string_type, string_adaptor>,
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public XPathExpression<string_type, string_adaptor>
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{
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typedef BinaryExpression<string_type, string_adaptor> baseT;
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public:
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OrOperator(XPathExpression<string_type, string_adaptor>* lhs,
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XPathExpression<string_type, string_adaptor>* rhs) :
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BinaryExpression<string_type, string_adaptor>(lhs, rhs) { }
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virtual XPathValuePtr<string_type, string_adaptor> evaluate(const DOM::Node<string_type, string_adaptor>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const
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{
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// From XPath 1.0 Rec, section 3.4
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// An or expression is evaluated by evaluating each operand and converting its value
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// to a boolean as if by a call to the boolean function. The result is true if either
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// value is true and false otherwise. The right operand is not evaluated if the
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// left operand evaluates to true.
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if(baseT::lhs()->evaluate(context, executionContext)->asBool())
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return BoolValue<string_type, string_adaptor>::createValue(true);
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return BoolValue<string_type, string_adaptor>::createValue(baseT::rhs()->evaluate(context, executionContext)->asBool());
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} // evaluate
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}; // class OrOperator
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template<class string_type, class string_adaptor>
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class AndOperator : private BinaryExpression<string_type, string_adaptor>,
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public XPathExpression<string_type, string_adaptor>
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{
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typedef BinaryExpression<string_type, string_adaptor> baseT;
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public:
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AndOperator(XPathExpression<string_type, string_adaptor>* lhs,
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XPathExpression<string_type, string_adaptor>* rhs) :
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BinaryExpression<string_type, string_adaptor>(lhs, rhs) { }
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virtual XPathValuePtr<string_type, string_adaptor> evaluate(const DOM::Node<string_type, string_adaptor>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const
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{
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// From XPath 1.0 Rec, section 3.4
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// An and expression is evaluated by evaluating each operand and converting its value
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// to a boolean as if by a call to the boolean function. The result is true if both
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// values are true and false otherwise. The right operand is not evaluated if the left
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// operand evaluates to false.
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if(!baseT::lhs()->evaluate(context, executionContext)->asBool())
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return BoolValue<string_type, string_adaptor>::createValue(false);
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return BoolValue<string_type, string_adaptor>::createValue(baseT::rhs()->evaluate(context, executionContext)->asBool());
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} // evaluate
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}; // class AndOperator
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} // namespace impl
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} // namespace XPath
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} // namespace Arabica
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#endif
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