1// -*- C++ -*-
2/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
3     Written by James Clark (jjc@jclark.com)
4
5This file is part of groff.
6
7groff is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12groff is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License along
18with groff; see the file COPYING.  If not, write to the Free Software
19Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21#include "eqn.h"
22#include "pbox.h"
23
24#define STRING_FORMAT PREFIX "str%d"
25
26#define SPECIAL_STRING "0s"
27#define SPECIAL_WIDTH_REG "0w"
28#define SPECIAL_HEIGHT_REG "0h"
29#define SPECIAL_DEPTH_REG "0d"
30#define SPECIAL_SUB_KERN_REG "0skern"
31#define SPECIAL_SKEW_REG "0skew"
32
33/*
34For example:
35
36.de Cl
37.ds 0s \Z'\\*[0s]'\v'\\n(0du'\D'l \\n(0wu -\\n(0hu-\\n(0du'\v'\\n(0hu'
38..
39.EQ
40define cancel 'special Cl'
41.EN
42*/
43
44
45class special_box : public pointer_box {
46  char *macro_name;
47public:
48  special_box(char *, box *);
49  ~special_box();
50  int compute_metrics(int);
51  void compute_subscript_kern();
52  void compute_skew();
53  void output();
54  void debug_print();
55};
56
57box *make_special_box(char *s, box *p)
58{
59  return new special_box(s, p);
60}
61
62special_box::special_box(char *s, box *pp) : pointer_box(pp), macro_name(s)
63{
64}
65
66special_box::~special_box()
67{
68  a_delete macro_name;
69}
70
71int special_box::compute_metrics(int style)
72{
73  int r = p->compute_metrics(style);
74  p->compute_subscript_kern();
75  p->compute_skew();
76  printf(".ds " SPECIAL_STRING " \"");
77  p->output();
78  printf("\n");
79  printf(".nr " SPECIAL_WIDTH_REG " 0\\n[" WIDTH_FORMAT "]\n", p->uid);
80  printf(".nr " SPECIAL_HEIGHT_REG " \\n[" HEIGHT_FORMAT "]\n", p->uid);
81  printf(".nr " SPECIAL_DEPTH_REG " \\n[" DEPTH_FORMAT "]\n", p->uid);
82  printf(".nr " SPECIAL_SUB_KERN_REG " \\n[" SUB_KERN_FORMAT "]\n", p->uid);
83  printf(".nr " SPECIAL_SKEW_REG " 0\\n[" SKEW_FORMAT "]\n", p->uid);
84  printf(".%s\n", macro_name);
85  printf(".rn " SPECIAL_STRING " " STRING_FORMAT "\n", uid);
86  printf(".nr " WIDTH_FORMAT " 0\\n[" SPECIAL_WIDTH_REG "]\n", uid);
87  printf(".nr " HEIGHT_FORMAT " 0>?\\n[" SPECIAL_HEIGHT_REG "]\n", uid);
88  printf(".nr " DEPTH_FORMAT " 0>?\\n[" SPECIAL_DEPTH_REG "]\n", uid);
89  printf(".nr " SUB_KERN_FORMAT " 0>?\\n[" SPECIAL_SUB_KERN_REG "]\n", uid);
90  printf(".nr " SKEW_FORMAT " 0\\n[" SPECIAL_SKEW_REG "]\n", uid);
91  // User will have to change MARK_REG if appropriate.
92  return r;
93}
94
95void special_box::compute_subscript_kern()
96{
97  // Already computed in compute_metrics(), so do nothing.
98}
99
100void special_box::compute_skew()
101{
102  // Already computed in compute_metrics(), so do nothing.
103}
104
105void special_box::output()
106{
107  printf("\\*[" STRING_FORMAT "]", uid);
108}
109
110void special_box::debug_print()
111{
112  fprintf(stderr, "special %s { ", macro_name);
113  p->debug_print();
114  fprintf(stderr, " }");
115}
116