1 /* $Id: eqn_term.c,v 1.19 2018/12/13 05:23:38 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 <ctype.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27
28 #include "eqn.h"
29 #include "out.h"
30 #include "term.h"
31
32 static const enum termfont fontmap[EQNFONT__MAX] = {
33 TERMFONT_NONE, /* EQNFONT_NONE */
34 TERMFONT_NONE, /* EQNFONT_ROMAN */
35 TERMFONT_BOLD, /* EQNFONT_BOLD */
36 TERMFONT_BOLD, /* EQNFONT_FAT */
37 TERMFONT_UNDER /* EQNFONT_ITALIC */
38 };
39
40 static void eqn_box(struct termp *, const struct eqn_box *);
41
42
43 void
term_eqn(struct termp * p,const struct eqn_box * bp)44 term_eqn(struct termp *p, const struct eqn_box *bp)
45 {
46
47 eqn_box(p, bp);
48 p->flags &= ~TERMP_NOSPACE;
49 }
50
51 static void
eqn_box(struct termp * p,const struct eqn_box * bp)52 eqn_box(struct termp *p, const struct eqn_box *bp)
53 {
54 const struct eqn_box *child;
55 const char *cp;
56 int delim;
57
58 /* Delimiters around this box? */
59
60 if ((bp->type == EQN_LIST && bp->expectargs > 1) ||
61 (bp->type == EQN_PILE && (bp->prev || bp->next)) ||
62 (bp->parent != NULL && (bp->parent->pos == EQNPOS_SQRT ||
63 /* Diacritic followed by ^ or _. */
64 ((bp->top != NULL || bp->bottom != NULL) &&
65 bp->parent->type == EQN_SUBEXPR &&
66 bp->parent->pos != EQNPOS_OVER && bp->next != NULL) ||
67 /* Nested over, sub, sup, from, to. */
68 (bp->type == EQN_SUBEXPR && bp->pos != EQNPOS_SQRT &&
69 ((bp->parent->type == EQN_LIST && bp->expectargs == 1) ||
70 (bp->parent->type == EQN_SUBEXPR &&
71 bp->pos != EQNPOS_SQRT)))))) {
72 if ((bp->parent->type == EQN_SUBEXPR && bp->prev != NULL) ||
73 (bp->type == EQN_LIST &&
74 bp->first != NULL &&
75 bp->first->type != EQN_PILE &&
76 bp->first->type != EQN_MATRIX &&
77 bp->prev != NULL &&
78 (bp->prev->type == EQN_LIST ||
79 (bp->prev->type == EQN_TEXT &&
80 (*bp->prev->text == '\\' ||
81 isalpha((unsigned char)*bp->prev->text))))))
82 p->flags |= TERMP_NOSPACE;
83 term_word(p, bp->left != NULL ? bp->left : "(");
84 p->flags |= TERMP_NOSPACE;
85 delim = 1;
86 } else
87 delim = 0;
88
89 /* Handle Fonts and text. */
90
91 if (bp->font != EQNFONT_NONE)
92 term_fontpush(p, fontmap[(int)bp->font]);
93
94 if (bp->text != NULL) {
95 if (strchr("!\"'),.:;?]}", *bp->text) != NULL)
96 p->flags |= TERMP_NOSPACE;
97 term_word(p, bp->text);
98 if ((cp = strchr(bp->text, '\0')) > bp->text &&
99 (strchr("\"'([{", cp[-1]) != NULL ||
100 (bp->prev == NULL && (cp[-1] == '-' ||
101 (cp >= bp->text + 5 &&
102 strcmp(cp - 5, "\\[mi]") == 0)))))
103 p->flags |= TERMP_NOSPACE;
104 }
105
106 /* Special box types. */
107
108 if (bp->pos == EQNPOS_SQRT) {
109 term_word(p, "\\(sr");
110 if (bp->first != NULL) {
111 p->flags |= TERMP_NOSPACE;
112 eqn_box(p, bp->first);
113 }
114 } else if (bp->type == EQN_SUBEXPR) {
115 child = bp->first;
116 eqn_box(p, child);
117 p->flags |= TERMP_NOSPACE;
118 term_word(p, bp->pos == EQNPOS_OVER ? "/" :
119 (bp->pos == EQNPOS_SUP ||
120 bp->pos == EQNPOS_TO) ? "^" : "_");
121 child = child->next;
122 if (child != NULL) {
123 p->flags |= TERMP_NOSPACE;
124 eqn_box(p, child);
125 if (bp->pos == EQNPOS_FROMTO ||
126 bp->pos == EQNPOS_SUBSUP) {
127 p->flags |= TERMP_NOSPACE;
128 term_word(p, "^");
129 p->flags |= TERMP_NOSPACE;
130 child = child->next;
131 if (child != NULL)
132 eqn_box(p, child);
133 }
134 }
135 } else {
136 child = bp->first;
137 if (bp->type == EQN_MATRIX &&
138 child != NULL &&
139 child->type == EQN_LIST &&
140 child->expectargs > 1)
141 child = child->first;
142 while (child != NULL) {
143 eqn_box(p,
144 bp->type == EQN_PILE &&
145 child->type == EQN_LIST &&
146 child->expectargs > 1 &&
147 child->args == 1 ?
148 child->first : child);
149 child = child->next;
150 }
151 }
152
153 /* Handle Fonts and diacritics. */
154
155 if (bp->font != EQNFONT_NONE)
156 term_fontpop(p);
157 if (bp->top != NULL) {
158 p->flags |= TERMP_NOSPACE;
159 term_word(p, bp->top);
160 }
161 if (bp->bottom != NULL) {
162 p->flags |= TERMP_NOSPACE;
163 term_word(p, "_");
164 }
165
166 /* Right delimiter after this box? */
167
168 if (delim) {
169 p->flags |= TERMP_NOSPACE;
170 term_word(p, bp->right != NULL ? bp->right : ")");
171 if (bp->parent->type == EQN_SUBEXPR && bp->next != NULL)
172 p->flags |= TERMP_NOSPACE;
173 }
174 }
175