src/troff/reg.h

   1 /*@
   2  * Copyright (c) 2014 - 2015 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   3  *
   4  * Copyright (C) 1989 - 1992, 2000, 2001, 2003
   5  *    Free Software Foundation, Inc.
   6  *      Written by James Clark (jjc@jclark.com)
   7  *
   8  * This is free software; you can redistribute it and/or modify it under
   9  * the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2, or (at your option) any later
  11  * version.
  12  *
  13  * This is distributed in the hope that it will be useful, but WITHOUT ANY
  14  * WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with groff; see the file COPYING.  If not, write to the Free Software
  20  * Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22 #ifndef _REG_H
  23 #define _REG_H
  24
  25 #include "config.h"
  26 #include "troff-config.h"
  27
  28 class reg
  29 : public object
  30 {
  31 public:
  32   virtual const char *get_string() = 0;
  33   virtual int get_value(units *);
  34   virtual void increment();
  35   virtual void decrement();
  36   virtual void set_increment(units);
  37   virtual void alter_format(char f, int w = 0);
  38   virtual const char *get_format();
  39   virtual void set_value(units);
  40 };
  41
  42 class constant_int_reg
  43 : public reg
  44 {
  45   int *p;
  46
  47 public:
  48   constant_int_reg(int *);
  49   const char *get_string();
  50 };
  51
  52 class general_reg
  53 : public reg
  54 {
  55   char format;
  56   int width;
  57   int inc;
  58
  59 public:
  60   general_reg();
  61   const char *get_string();
  62   void increment();
  63   void decrement();
  64   void alter_format(char f, int w = 0);
  65   void set_increment(units);
  66   const char *get_format();
  67   void add_value(units);
  68
  69   void set_value(units) = 0;
  70   int get_value(units *) = 0;
  71 };
  72
  73 class variable_reg
  74 : public general_reg
  75 {
  76   units *ptr;
  77
  78 public:
  79   variable_reg(int *);
  80   void set_value(units);
  81   int get_value(units *);
  82 };
  83
  84 extern object_dictionary number_reg_dictionary;
  85 extern void set_number_reg(symbol nm, units n);
  86 extern void check_output_limits(int x, int y);
  87 extern void reset_output_registers();
  88
  89 reg *lookup_number_reg(symbol);
  90 #if 0
  91 void inline_define_reg();
  92 #endif
  93
  94 #endif // _REG_H
  95 // s-it2-mode