nntpchan/contrib/backends/nntpchan-daemon/libmustache/visitor/render_section.hpp

#pragma once

#include <boost/variant/static_visitor.hpp>

#include "../render_context.hpp"
#include "../utils.hpp"
#include "mstch/mstch.hpp"
#include "render_node.hpp"

namespace mstch
{

class render_section : public boost::static_visitor<std::string>
{
public:
  enum class flag
  {
    none,
    keep_array
  };
  render_section(render_context &ctx, const template_type &section, const delim_type &delims, flag p_flag = flag::none)
      : m_ctx(ctx), m_section(section), m_delims(delims), m_flag(p_flag)
  {
  }

  template <class T> std::string operator()(const T &t) const
  {
    return render_context::push(m_ctx, t).render(m_section);
  }

  std::string operator()(const lambda &fun) const
  {
    std::string section_str;
    for (auto &token : m_section)
      section_str += token.raw();
    template_type interpreted{fun([this](const mstch::node &n) { return visit(render_node(m_ctx), n); }, section_str),
                              m_delims};
    return render_context::push(m_ctx).render(interpreted);
  }

  std::string operator()(const array &array) const
  {
    std::string out;
    if (m_flag == flag::keep_array)
      return render_context::push(m_ctx, array).render(m_section);
    else
      for (auto &item : array)
        out += visit(render_section(m_ctx, m_section, m_delims, flag::keep_array), item);
    return out;
  }

private:
  render_context &m_ctx;
  const template_type &m_section;
  const delim_type &m_delims;
  flag m_flag;
};
}