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// Copyright Maarten L. Hekkelman, Radboud University 2008-2012.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <string>
#include <boost/static_assert.hpp>
#include <zeep/xml/node.hpp>
namespace zeep { namespace xml {
class document;
// --------------------------------------------------------------------
/// XPath's can contain variables. And variables can contain all kinds of data
/// like strings, numbers and even node_sets. If you want to use variables,
/// you can define a context, add your variables to it and then pass it on
/// in the xpath::evaluate method.
class context
{
public:
#ifndef LIBZEEP_DOXYGEN_INVOKED
context();
virtual ~context();
#endif
template<typename T>
void set(const std::string& name, const T& value);
template<typename T>
T get(const std::string& name);
#ifndef LIBZEEP_DOXYGEN_INVOKED
private:
context(const context&);
context& operator=(const context&);
friend class xpath;
struct context_imp* m_impl;
#endif
};
// --------------------------------------------------------------------
/// The actual xpath implementation. It expects an xpath in the constructor and
/// this path _must_ be UTF-8 encoded.
class xpath
{
public:
xpath(const std::string& path);
xpath(const char* path);
xpath(const xpath& rhs);
xpath& operator=(const xpath&);
#ifndef LIBZEEP_DOXYGEN_INVOKED
virtual ~xpath();
#endif
/// evaluate returns a node_set. If you're only interested in zeep::xml::element
/// results, you should call the evaluate<element>() instantiation.
template<typename NODE_TYPE>
std::list<NODE_TYPE*> evaluate(const node& root) const;
/// The second evaluate method is used for xpaths that contain variables.
template<typename NODE_TYPE>
std::list<NODE_TYPE*> evaluate(const node& root, context& ctxt) const;
/// Returns true if the \a n node matches the XPath
bool matches(const node* n) const;
#ifndef LIBZEEP_DOXYGEN_INVOKED
private:
struct xpath_imp* m_impl;
#endif
};
#ifndef LIBZEEP_DOXYGEN_INVOKED
// --------------------------------------------------------------------
// template specialisations.
template<typename T>
void context::set(const std::string& name, const T& value)
{
// only implemented for the cases specialised below
assert(false);
}
template<>
void context::set<double>(const std::string& name, const double& value);
template<>
void context::set<std::string>(const std::string& name, const std::string& value);
template<typename T>
T context::get(const std::string& name)
{
// only implemented for the cases specialised below
assert(false);
}
template<>
double context::get<double>(const std::string& name);
template<>
std::string context::get<std::string>(const std::string& name);
// --------------------------------------------------------------------
template<>
node_set xpath::evaluate<node>(const node& root) const;
template<>
element_set xpath::evaluate<element>(const node& root) const;
template<>
node_set xpath::evaluate<node>(const node& root, context& ctxt) const;
template<>
element_set xpath::evaluate<element>(const node& root, context& ctxt) const;
#endif
}
}
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