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https://github.com/jezhiggins/arabica
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54 lines
2 KiB
C++
54 lines
2 KiB
C++
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#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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class OrOperator : private BinaryExpression, public XPathExpression
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{
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public:
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OrOperator(XPathExpression* lhs, XPathExpression* rhs) :
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BinaryExpression(lhs, rhs) { }
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virtual XPathValuePtr evaluate(const DOM::Node<std::string>& context,
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const ExecutionContext& 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(lhs()->evaluate(context, executionContext)->asBool())
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return BoolValue::createValue(true);
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return BoolValue::createValue(rhs()->evaluate(context, executionContext)->asBool());
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} // evaluate
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}; // class OrOperator
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class AndOperator : private BinaryExpression, public XPathExpression
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{
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public:
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AndOperator(XPathExpression* lhs, XPathExpression* rhs) :
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BinaryExpression(lhs, rhs) { }
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virtual XPathValuePtr evaluate(const DOM::Node<std::string>& context,
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const ExecutionContext& 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(!lhs()->evaluate(context, executionContext)->asBool())
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return BoolValue::createValue(false);
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return BoolValue::createValue(rhs()->evaluate(context, executionContext)->asBool());
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} // evaluate
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}; // class AndOperator
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} // namespace XPath
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} // namespace Arabica
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#endif
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