mirror of
https://github.com/jezhiggins/arabica
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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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#ifndef ARABICA_XPATH_FUNCTION_RESOLVER_HPP
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#define ARABICA_XPATH_FUNCTION_RESOLVER_HPP
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#include <boost/shared_ptr.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 XPathFunction;
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class XPathExpression;
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typedef boost::shared_ptr<XPathExpression> XPathExpressionPtr;
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class UndefinedFunctionException : public std::runtime_error
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{
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public:
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UndefinedFunctionException(const std::string& thing) : std::runtime_error("The function '" + thing + "' is undefined.") { }
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}; // class UndefinedFunctionException
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class FunctionResolver
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{
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public:
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// TODO: should make this a QName
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virtual XPathFunction* resolveFunction(const std::string& name,
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const std::vector<XPathExpressionPtr>& argExprs) const = 0;
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}; // class FunctionResolver
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typedef boost::shared_ptr<FunctionResolver> FunctionResolverPtr;
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class NullFunctionResolver : public FunctionResolver
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{
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public:
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virtual XPathFunction* resolveFunction(const std::string& name,
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const std::vector<XPathExpressionPtr>& argExprs) const
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{
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throw UndefinedFunctionException(name);
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} // resolveVariable
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}; // NullFunctionResolver
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} // namespace XPath
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} // namespace Arabica
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#endif
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