Xport: XHTML Parsing and Objective Reporting Toolkit

/************************************************************************
Xport: XHTML Parsing & Objective Reporting Toolkit
Copyright (C) 2007  Mitchel Haas

This file is part of Xport.

Xport is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Xport is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Xport.  If not, see <http://www.gnu.org/licenses/>.

For complete documentation on this library and alternative
licensing options, visit http://www.xportpro.com
Email questions, comments or suggestions to mitchel.haas@xportpro.com
************************************************************************/
#pragma once
#include "common.h"
#include "xhtml_transitional.h"
#include <set>
#include <string>


namespace Xport 
{
  template<typename T, typename U> class tag_traits;
  template<typename T, typename U> class tag_trait;
  template<typename T> struct tag_info;
}



template <typename DT, typename CT = char>
class Xport::tag_trait
{
private: // only tag_traits can create these objects
  tag_trait(  xhtml_tag_enum tg_enum, 
        const std::string& tname, 
        xhtml_nesting_type ntype, 
        xhtml_nesting_type allowed_ntype, 
        const std::set<attribute::xhtml_attribute>& allowed_attrs,
        const std::set<xhtml_tag_enum>& allowed_nested_tgs,
        const std::set<xhtml_tag_enum>& nested_except)
          : tag_enum(tg_enum), tag_nesting_type(ntype), allowed_tag_nested_type(allowed_ntype), 
            allowed_nested_tags(allowed_nested_tgs), nested_tag_exceptions(nested_except), attributes(allowed_attrs)  
  {
    std::basic_ostringstream<CT> otname;
    otname << tname.c_str();
    tg_name = otname.str();
  }


  ~tag_trait() {}

public:
  // public interface
  xhtml_nesting_type allowed_nested_type() const { return allowed_tag_nested_type; }
  bool check_attribute(const attribute::xhtml_attribute attrib) const { return attributes.find(attrib) != attributes.end(); }
  bool check_style(const css::css_property _property) const;
  bool empty_tag() const { return allowed_tag_nested_type == xhtml_nesting_type(0) && allowed_nested_tags.empty();; }
  const std::set<xhtml_tag_enum>& nested_exceptions() const { return nested_tag_exceptions; }
  const std::set<xhtml_tag_enum>& nested_tags() const { return allowed_nested_tags; }
  xhtml_nesting_type nesting_type() const { return tag_nesting_type; }
  xhtml_tag_enum tag_enumeration() const { return tag_enum; }
  std::basic_string<CT> tag_name() const { return tg_name; }

private:
  // private interface & implementation
  void add_allowed_nested_tag(DT _tag_enum) { allowed_nested_tags.insert(_tag_enum); }
  void add_nested_exception(DT _tag_enum) { nested_tag_exceptions.insert(_tag_enum); }
  bool allow_pcdata() const { return (allowed_nested_type & (in_line|pc_data) > 0); }
  friend bool operator < (const tag_trait& lhs, const tag_trait& rhs) { return lhs.tag_enum < rhs.tag_enum; }
  void remove_allowed_nested_tag(DT _tag_enum) { allowed_nested_tags.erase(_tag_enum); }
  void remove_attributes(const attribute::xhtml_attribute* attribs, int count);
  void remove_nested_exception(DT _tag_enum) { nested_tag_exceptions.erase(_tag_enum); }

private:
  xhtml_tag_enum tag_enum;
  xhtml_nesting_type tag_nesting_type;
  xhtml_nesting_type allowed_tag_nested_type;
  std::basic_string<CT> tg_name;
  std::set<xhtml_tag_enum> allowed_nested_tags;
  std::set<xhtml_tag_enum> nested_tag_exceptions;
  std::set<attribute::xhtml_attribute> attributes;
  std::set<css::css_property> properties;

  // friends
  friend class tag_traits<DT, CT>;
  friend struct tag_info<DT>;
};



#include "tag_trait.inl"