2 * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include "telescope.h"
27 * There's a simple text wrapping algorithm.
29 * 1. if it's a line in a pre-formatted block:
32 * 2. otherwise advance the line char by char.
33 * 3. when ending the space, split the line at the last occurrence of
34 * a "word separator" (i.e. " \t-") or at point if none.
40 erase_buffer(struct buffer *buffer)
43 empty_linelist(buffer);
47 empty_linelist(struct buffer *buffer)
51 TAILQ_FOREACH_SAFE(l, &buffer->page.head, lines, lt) {
52 TAILQ_REMOVE(&buffer->page.head, l, lines);
60 empty_vlist(struct buffer *buffer)
64 buffer->top_line = NULL;
66 buffer->current_line = NULL;
69 TAILQ_FOREACH_SAFE(vl, &buffer->head, vlines, t) {
70 TAILQ_REMOVE(&buffer->head, vl, vlines);
77 push_line(struct buffer *buffer, const struct line *l, const char *buf, size_t len, int flags)
83 if ((vl = calloc(1, sizeof(*vl))) == NULL)
86 if (len != 0 && (vl->line = calloc(1, len+1)) == NULL) {
93 memcpy(vl->line, buf, len);
96 if (TAILQ_EMPTY(&buffer->head))
97 TAILQ_INSERT_HEAD(&buffer->head, vl, vlines);
99 TAILQ_INSERT_TAIL(&buffer->head, vl, vlines);
104 * Similar to wrap_text, but emit only o vline.
107 wrap_one(struct buffer *buffer, const char *prfx, struct line *l, size_t width)
109 struct vline *vl, *t;
112 * be lazy: call wrap_text and then discard the continuations.
115 if (!wrap_text(buffer, prfx, l, width))
118 TAILQ_FOREACH_SAFE(vl, &buffer->head, vlines, t) {
119 if (vl->flags & L_CONTINUATION) {
120 TAILQ_REMOVE(&buffer->head, vl, vlines);
130 * Build a list of visual line by wrapping the given line, assuming
131 * that when printed will have a leading prefix prfx.
134 wrap_text(struct buffer *buffer, const char *prfx, struct line *l, size_t width)
136 const char *separators = " \t-";
137 const char *start, *end, *line, *lastsep, *lastchar;
138 uint32_t cp = 0, state = 0;
139 size_t cur, prfxwidth, w;
142 if ((line = l->line) == NULL)
143 return push_line(buffer, l, NULL, 0, 0);
145 prfxwidth = utf8_swidth(prfx);
151 for (; *line; line++) {
152 if (utf8_decode(&state, &cp, *line))
154 w = utf8_chwidth(cp);
155 if (cur + w >= width -1) {
156 end = lastsep == NULL
157 ? utf8_next_cp((char*)lastchar)
158 : utf8_next_cp((char*)lastsep);
159 if (!push_line(buffer, l, start, end - start, flags))
161 flags = L_CONTINUATION;
163 cur = prfxwidth + utf8_swidth_between(start, lastchar);
164 } else if (strchr(separators, *line) != NULL) {
168 lastchar = utf8_prev_cp(line, l->line);
172 return push_line(buffer, l, start, line - start, flags);
176 hardwrap_text(struct buffer *buffer, struct line *l, size_t width)
178 const char *line, *start, *lastchar;
180 uint32_t state = 0, cp = 0;
183 if ((line = l->line) == NULL)
184 return push_line(buffer, l, NULL, 0, 0);
190 for (; *line; line++) {
191 if (utf8_decode(&state, &cp, *line))
193 w = utf8_chwidth(cp);
194 if (cur + w >= width) {
195 if (!push_line(buffer, l, start, lastchar - start, cont))
202 lastchar = utf8_prev_cp(line, l->line);
206 return push_line(buffer, l, start, line - start, cont);