1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
// -*- C++ -*-
/* Copyright (C) 1989-2020 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff 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.
groff 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include "eqn.h"
#include "pbox.h"
#define STRING_FORMAT PREFIX "str%d"
#define SPECIAL_STRING "0s"
#define SPECIAL_WIDTH_REG "0w"
#define SPECIAL_HEIGHT_REG "0h"
#define SPECIAL_DEPTH_REG "0d"
#define SPECIAL_SUB_KERN_REG "0skern"
#define SPECIAL_SKEW_REG "0skew"
/*
For example:
.de Cl
.ds 0s \Z'\\*[0s]'\v'\\n(0du'\D'l \\n(0wu -\\n(0hu-\\n(0du'\v'\\n(0hu'
..
.EQ
define cancel 'special Cl'
.EN
*/
class special_box : public pointer_box {
char *macro_name;
public:
special_box(char *, box *);
~special_box();
int compute_metrics(int);
void compute_subscript_kern();
void compute_skew();
void output();
void debug_print();
};
box *make_special_box(char *s, box *p)
{
return new special_box(s, p);
}
special_box::special_box(char *s, box *pp) : pointer_box(pp), macro_name(s)
{
}
special_box::~special_box()
{
delete[] macro_name;
}
int special_box::compute_metrics(int style)
{
int r = p->compute_metrics(style);
p->compute_subscript_kern();
p->compute_skew();
printf(".ds " SPECIAL_STRING " \"");
p->output();
printf("\n");
printf(".nr " SPECIAL_WIDTH_REG " 0\\n[" WIDTH_FORMAT "]\n", p->uid);
printf(".nr " SPECIAL_HEIGHT_REG " \\n[" HEIGHT_FORMAT "]\n", p->uid);
printf(".nr " SPECIAL_DEPTH_REG " \\n[" DEPTH_FORMAT "]\n", p->uid);
printf(".nr " SPECIAL_SUB_KERN_REG " \\n[" SUB_KERN_FORMAT "]\n", p->uid);
printf(".nr " SPECIAL_SKEW_REG " 0\\n[" SKEW_FORMAT "]\n", p->uid);
printf(".%s\n", macro_name);
printf(".rn " SPECIAL_STRING " " STRING_FORMAT "\n", uid);
printf(".nr " WIDTH_FORMAT " 0\\n[" SPECIAL_WIDTH_REG "]\n", uid);
printf(".nr " HEIGHT_FORMAT " 0>?\\n[" SPECIAL_HEIGHT_REG "]\n", uid);
printf(".nr " DEPTH_FORMAT " 0>?\\n[" SPECIAL_DEPTH_REG "]\n", uid);
printf(".nr " SUB_KERN_FORMAT " 0>?\\n[" SPECIAL_SUB_KERN_REG "]\n", uid);
printf(".nr " SKEW_FORMAT " 0\\n[" SPECIAL_SKEW_REG "]\n", uid);
// User will have to change MARK_REG if appropriate.
return r;
}
void special_box::compute_subscript_kern()
{
// Already computed in compute_metrics(), so do nothing.
}
void special_box::compute_skew()
{
// Already computed in compute_metrics(), so do nothing.
}
void special_box::output()
{
if (output_format == troff)
printf("\\*[" STRING_FORMAT "]", uid);
else if (output_format == mathml)
printf("<merror>eqn specials cannot be expressed in MathML</merror>");
}
void special_box::debug_print()
{
fprintf(stderr, "special %s { ", macro_name);
p->debug_print();
fprintf(stderr, " }");
}
|
