// file      : xml/serializer -*- C++ -*-
// copyright : Copyright (c) 2013-2014 Code Synthesis Tools CC
// license   : MIT; see accompanying LICENSE file

#ifndef XML_SERIALIZER
#define XML_SERIALIZER

#include <xml/details/pre.hxx>

#include <string>
#include <ostream>
#include <cstddef> // std::size_t

#include <xml/details/genx/genx.h>

#include <xml/forward>
#include <xml/qname>
#include <xml/exception>

#include <xml/details/export.hxx>

namespace xml
{
  class serializer;

  struct LIBSTUDXML_EXPORT serialization: exception
  {
    virtual
    ~serialization () throw ();

    serialization (const std::string& name,
                   const std::string& description);

    serialization (const serializer&, const std::string& description);

    const std::string&
    name () const {return name_;}

    const std::string&
    description () const {return description_;}

    virtual const char*
    what () const throw ();

  private:
    void
    init ();

  private:
    std::string name_;
    std::string description_;
    std::string what_;
  };

  class LIBSTUDXML_EXPORT serializer
  {
  public:
    typedef xml::qname qname_type;

    // Serialize to std::ostream. Output name is used in diagnostics to
    // identify the document being serialized. The indentation argument
    // specifies the number of indentation spaces that should be used for
    // pretty-printing. If 0 is passed, no pretty-printing is performed.
    //
    // If stream exceptions are enabled then std::ios_base::failure
    // exception is used to report io errors (badbit and failbit).
    // Otherwise, those are reported as the serialization exception.
    //
    serializer (std::ostream&,
                const std::string& output_name,
                unsigned short indentation = 2);

    const std::string&
    output_name () const {return oname_;}

    ~serializer ();

  private:
    serializer (const serializer&);
    serializer& operator= (const serializer&);

    // Serialization functions.
    //
  public:

    // Elements.
    //
    void
    start_element (const qname_type& qname);

    void
    start_element (const std::string& name);

    void
    start_element (const std::string& ns, const std::string& name);

    void
    end_element ();

    // Helpers for serializing elements with simple content. The first two
    // functions assume that start_element() has already been called. The
    // other two serialize the complete element, from start to end.
    //
    void
    element (const std::string& value);

    template <typename T>
    void
    element (const T& value);

    void
    element (const std::string& name, const std::string& value);

    template <typename T>
    void
    element (const std::string& name, const T& value);

    void
    element (const qname_type& qname, const std::string& value);

    template <typename T>
    void
    element (const qname_type& qname, const T& value);

    void
    element (const std::string& namespace_,
             const std::string& name,
             const std::string& value);

    template <typename T>
    void
    element (const std::string& namespace_,
             const std::string& name,
             const T& value);

    // Attributes.
    //
    void
    start_attribute (const qname_type& qname);

    void
    start_attribute (const std::string& name);

    void
    start_attribute (const std::string& ns, const std::string& name);

    void
    end_attribute ();

    void
    attribute (const qname_type& qname, const std::string& value);

    template <typename T>
    void
    attribute (const qname_type& qname, const T& value);

    void
    attribute (const std::string& name, const std::string& value);

    template <typename T>
    void
    attribute (const std::string& name, const T& value);

    void
    attribute (const std::string& ns,
               const std::string& name,
               const std::string& value);

    template <typename T>
    void
    attribute (const std::string& ns,
               const std::string& name,
               const T& value);

    // Characters.
    //
    void
    characters (const std::string& value);

    template <typename T>
    void
    characters (const T& value);

    // Namespaces declaration. If prefix is empty, then the default
    // namespace is declared. If both prefix and namespace are empty,
    // then the default namespace declaration is cleared (xmlns="").
    //
    void
    namespace_decl (const std::string& ns, const std::string& prefix);

    // XML declaration. If encoding or standalone are not specified,
    // then these attributes are omitted from the output.
    //
    void
    xml_decl (const std::string& version = "1.0",
              const std::string& encoding = "UTF-8",
              const std::string& standalone = "");

    // Utility functions.
    //
  public:
    // Return true if there is a mapping. In this case, prefix contains
    // the mapped prefix.
    //
    bool
    lookup_namespace_prefix (const std::string& ns, std::string& prefix);

  private:
    void
    handle_error (genxStatus);

  private:
    std::ostream& os_;
    std::ostream::iostate os_state_; // Original exception state.
    const std::string oname_;

    genxWriter s_;
    genxSender sender_;
    std::size_t depth_;
  };
}

#include <xml/serializer.ixx>

#include <xml/details/post.hxx>

#endif // XML_SERIALIZER