mirror of
https://github.com/jezhiggins/arabica
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121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
#ifndef ARABICA_XPATHIC_XPATH_EXPRESSION_H
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#define ARABICA_XPATHIC_XPATH_EXPRESSION_H
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#include <string>
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#include <DOM/Node.hpp>
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#include "xpath_object.hpp"
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#include "xpath_execution_context.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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template<class string_type, class string_adaptor>
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class XPathExpression
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{
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protected:
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XPathExpression() { }
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public:
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virtual ~XPathExpression() { }
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XPathValuePtr<string_type> evaluate(const DOM::Node<string_type>& context) const
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{
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ExecutionContext<string_type, string_adaptor> executionContext;
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return evaluate(context, executionContext);
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} // evaluate
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virtual bool evaluateAsBool(const DOM::Node<string_type>& context) const { return evaluate(context)->asBool(); }
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virtual double evaluateAsNumber(const DOM::Node<string_type>& context) const { return evaluate(context)->asNumber(); }
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virtual string_type evaluateAsString(const DOM::Node<string_type>& context) const { return evaluate(context)->asString(); }
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virtual NodeSet<string_type> evaluateAsNodeSet(const DOM::Node<string_type>& context) const { return evaluate(context)->asNodeSet(); }
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virtual XPathValuePtr<string_type> evaluate(const DOM::Node<string_type>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const = 0;
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virtual bool evaluateAsBool(const DOM::Node<string_type>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const { return evaluate(context, executionContext)->asBool(); }
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virtual double evaluateAsNumber(const DOM::Node<string_type>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const { return evaluate(context, executionContext)->asNumber(); }
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virtual string_type evaluateAsString(const DOM::Node<string_type>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const { return evaluate(context, executionContext)->asString(); }
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virtual NodeSet<string_type> evaluateAsNodeSet(const DOM::Node<string_type>& context,
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const ExecutionContext<string_type, string_adaptor>& executionContext) const { return evaluate(context, executionContext)->asNodeSet(); }
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private:
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XPathExpression(const XPathExpression&);
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bool operator==(const XPathExpression&);
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XPathExpression& operator=(const XPathExpression&);
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}; // class XPathExpression
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template<class string_type, class string_adaptor = Arabica::default_string_adaptor<string_type> >
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class XPathExpressionPtr : public boost::shared_ptr<XPathExpression<string_type, string_adaptor> >
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{
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public:
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XPathExpressionPtr() :
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boost::shared_ptr<XPathExpression<string_type, string_adaptor> >() { }
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explicit XPathExpressionPtr(XPathExpression<string_type, string_adaptor>* xp) :
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boost::shared_ptr<XPathExpression<string_type, string_adaptor> >(xp) { }
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XPathExpressionPtr(const XPathExpressionPtr& rhs) :
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boost::shared_ptr<XPathExpression<string_type, string_adaptor> >(rhs) { }
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XPathExpressionPtr& operator=(const XPathExpressionPtr& rhs)
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{
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boost::shared_ptr<XPathExpression<string_type, string_adaptor> >::operator=(rhs);
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return *this;
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} // operator=
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}; // class XPathExpressionPtr
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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 UnaryExpression
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{
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public:
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UnaryExpression(XPathExpression<string_type, string_adaptor>* expr) :
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expr_(expr) { }
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protected:
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~UnaryExpression()
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{
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delete expr_;
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} // ~UnaryExpression
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XPathExpression<string_type, string_adaptor>* expr() const { return expr_; }
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private:
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XPathExpression<string_type, string_adaptor>* expr_;
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}; // class UnaryExpression
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template<class string_type, class string_adaptor>
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class BinaryExpression
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{
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public:
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BinaryExpression(XPathExpression<string_type, string_adaptor>* lhs,
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XPathExpression<string_type, string_adaptor>* rhs) :
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lhs_(lhs),
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rhs_(rhs)
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{
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} // BinaryExpression
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protected:
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~BinaryExpression()
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{
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delete lhs_;
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delete rhs_;
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} // ~BinaryExpression
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XPathExpression<string_type, string_adaptor>* lhs() const { return lhs_; }
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XPathExpression<string_type, string_adaptor>* rhs() const { return rhs_; }
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private:
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XPathExpression<string_type, string_adaptor>* lhs_;
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XPathExpression<string_type, string_adaptor>* rhs_;
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}; // class BinaryExpression
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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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