#ifndef _FORMAT_H
#define _FORMAT_H

#include "journal.h"
#include "expr.h"
#include "walk.h"

namespace ledger {

DECLARE_EXCEPTION(format_error, std::runtime_error);

class format_t : public noncopyable
{
  struct element_t : public noncopyable
  {
#define ELEMENT_ALIGN_LEFT 0x01
#define ELEMENT_HIGHLIGHT  0x02

    enum kind_t {
      STRING,
      EXPR,
#if 0
      DEPTH_SPACER
#endif
    };

    kind_t	  type;
    unsigned char flags;
    unsigned char min_width;
    unsigned char max_width;
    string	  chars;
    expr_t	  expr;

    scoped_ptr<struct element_t> next;

    element_t() throw()
      : type(STRING), flags(false), min_width(0), max_width(0) {
      TRACE_CTOR(element_t, "");
    }
    ~element_t() throw() {
      TRACE_DTOR(element_t);
    }

    friend inline void mark_red(std::ostream& out, const element_t * elem) {
      out.setf(std::ios::left);
      out.width(0);
      out << "\e[31m";

      if (elem->flags & ELEMENT_ALIGN_LEFT)
	out << std::left;
      else
	out << std::right;

      if (elem->min_width > 0)
	out.width(elem->min_width);
    }

    void dump(std::ostream& out) const;
  };

  string		 format_string;
  scoped_ptr<element_t>	 elements;

  enum elision_style_t {
    TRUNCATE_TRAILING,
    TRUNCATE_MIDDLE,
    TRUNCATE_LEADING,
    ABBREVIATE
  };

  static elision_style_t elision_style;
  static int		 abbrev_length;

  static bool		 ansi_codes;
  static bool		 ansi_invert;

  static element_t * parse_elements(const string& fmt);

public:
  format_t() {
    TRACE_CTOR(format_t, "");
  }
  format_t(const string& _format) {
    TRACE_CTOR(format_t, "const string&");
    parse(_format);
  }
  ~format_t() {
    TRACE_DTOR(format_t);
  }

  void parse(const string& _format) {
    elements.reset(parse_elements(_format));
    format_string = _format;
  }

  void format(std::ostream& out, scope_t& scope);

  void dump(std::ostream& out) const {
    for (const element_t * elem = elements.get();
	 elem;
	 elem = elem->next.get())
      elem->dump(out);
  }

  static string truncate(const string& str, unsigned int width,
			 const bool is_account = false);
};

} // namespace ledger

#endif // _FORMAT_H