1 /* $Id: eqn_term.c,v 1.13 2017/07/08 14:51:04 schwarze Exp $ */
2 /*
3 * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18 #include "config.h"
19
20 #include <sys/types.h>
21
22 #include <assert.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "mandoc.h"
28 #include "out.h"
29 #include "term.h"
30
31 static const enum termfont fontmap[EQNFONT__MAX] = {
32 TERMFONT_NONE, /* EQNFONT_NONE */
33 TERMFONT_NONE, /* EQNFONT_ROMAN */
34 TERMFONT_BOLD, /* EQNFONT_BOLD */
35 TERMFONT_BOLD, /* EQNFONT_FAT */
36 TERMFONT_UNDER /* EQNFONT_ITALIC */
37 };
38
39 static void eqn_box(struct termp *, const struct eqn_box *);
40
41
42 void
43 term_eqn(struct termp *p, const struct eqn_box *bp)
44 {
45
46 eqn_box(p, bp);
47 p->flags &= ~TERMP_NOSPACE;
48 }
49
50 static void
51 eqn_box(struct termp *p, const struct eqn_box *bp)
52 {
53 const struct eqn_box *child;
54 int delim;
55
56 /* Delimiters around this box? */
57
58 if ((bp->type == EQN_LIST && bp->expectargs > 1) ||
59 (bp->type == EQN_PILE && (bp->prev || bp->next)) ||
60 (bp->parent != NULL && (bp->parent->pos == EQNPOS_SQRT ||
61 /* Diacritic followed by ^ or _. */
62 ((bp->top != NULL || bp->bottom != NULL) &&
63 bp->parent->type == EQN_SUBEXPR &&
64 bp->parent->pos != EQNPOS_OVER && bp->next != NULL) ||
65 /* Nested over, sub, sup, from, to. */
66 (bp->type == EQN_SUBEXPR && bp->pos != EQNPOS_SQRT &&
67 ((bp->parent->type == EQN_LIST && bp->expectargs == 1) ||
68 (bp->parent->type == EQN_SUBEXPR &&
69 bp->pos != EQNPOS_SQRT)))))) {
70 if (bp->parent->type == EQN_SUBEXPR && bp->prev != NULL)
71 p->flags |= TERMP_NOSPACE;
72 term_word(p, bp->left != NULL ? bp->left : "(");
73 p->flags |= TERMP_NOSPACE;
74 delim = 1;
75 } else
76 delim = 0;
77
78 /* Handle Fonts and text. */
79
80 if (bp->font != EQNFONT_NONE)
81 term_fontpush(p, fontmap[(int)bp->font]);
82
83 if (bp->text != NULL)
84 term_word(p, bp->text);
85
86 /* Special box types. */
87
88 if (bp->pos == EQNPOS_SQRT) {
89 term_word(p, "sqrt");
90 if (bp->first != NULL) {
91 p->flags |= TERMP_NOSPACE;
92 eqn_box(p, bp->first);
93 }
94 } else if (bp->type == EQN_SUBEXPR) {
95 child = bp->first;
96 eqn_box(p, child);
97 p->flags |= TERMP_NOSPACE;
98 term_word(p, bp->pos == EQNPOS_OVER ? "/" :
99 (bp->pos == EQNPOS_SUP ||
100 bp->pos == EQNPOS_TO) ? "^" : "_");
101 p->flags |= TERMP_NOSPACE;
102 child = child->next;
103 if (child != NULL) {
104 eqn_box(p, child);
105 if (bp->pos == EQNPOS_FROMTO ||
106 bp->pos == EQNPOS_SUBSUP) {
107 p->flags |= TERMP_NOSPACE;
108 term_word(p, "^");
109 p->flags |= TERMP_NOSPACE;
110 child = child->next;
111 if (child != NULL)
112 eqn_box(p, child);
113 }
114 }
115 } else {
116 child = bp->first;
117 if (bp->type == EQN_MATRIX &&
118 child != NULL &&
119 child->type == EQN_LIST &&
120 child->expectargs > 1)
121 child = child->first;
122 while (child != NULL) {
123 eqn_box(p,
124 bp->type == EQN_PILE &&
125 child->type == EQN_LIST &&
126 child->expectargs > 1 &&
127 child->args == 1 ?
128 child->first : child);
129 child = child->next;
130 }
131 }
132
133 /* Handle Fonts and diacritics. */
134
135 if (bp->font != EQNFONT_NONE)
136 term_fontpop(p);
137 if (bp->top != NULL) {
138 p->flags |= TERMP_NOSPACE;
139 term_word(p, bp->top);
140 }
141 if (bp->bottom != NULL) {
142 p->flags |= TERMP_NOSPACE;
143 term_word(p, "_");
144 }
145
146 /* Right delimiter after this box? */
147
148 if (delim) {
149 p->flags |= TERMP_NOSPACE;
150 term_word(p, bp->right != NULL ? bp->right : ")");
151 if (bp->parent->type == EQN_SUBEXPR && bp->next != NULL)
152 p->flags |= TERMP_NOSPACE;
153 }
154 }