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.
18 * A streaming gemtext parser.
25 #include <telescope.h>
31 static int gemtext_parse(struct parser*, const char*, size_t);
32 static int gemtext_free(struct parser*);
34 static int parse_text(struct parser*, enum line_type, const char*, size_t);
35 static int parse_link(struct parser*, enum line_type, const char*, size_t);
36 static int parse_title(struct parser*, enum line_type, const char*, size_t);
37 static int parse_item(struct parser*, enum line_type, const char*, size_t);
38 static int parse_quote(struct parser*, enum line_type, const char*, size_t);
39 static int parse_pre_start(struct parser*, enum line_type, const char*, size_t);
40 static int parse_pre_cnt(struct parser*, enum line_type, const char*, size_t);
41 static int parse_pre_end(struct parser*, enum line_type, const char*, size_t);
43 typedef int (parselinefn)(struct parser*, enum line_type, const char*, size_t);
45 static parselinefn *parsers[] = {
46 parse_text, /* LINE_TEXT */
47 parse_link, /* LINE_LINK */
48 parse_title, /* LINE_TITLE_1 */
49 parse_title, /* LINE_TITLE_2 */
50 parse_title, /* LINE_TITLE_3 */
51 parse_item, /* LINE_ITEM */
52 parse_quote, /* LINE_QUOTE */
53 parse_pre_start, /* LINE_PRE_START */
54 parse_pre_cnt, /* LINE_PRE_CONTENT */
55 parse_pre_end, /* LINE_PRE_END */
59 gemtext_initparser(struct parser *p)
61 memset(p, 0, sizeof(*p));
63 p->parse = &gemtext_parse;
64 p->free = &gemtext_free;
68 emit_line(struct parser *p, enum line_type type, char *line, char *alt)
72 if ((l = calloc(1, sizeof(*l))) == NULL)
79 if (TAILQ_EMPTY(&p->head))
80 TAILQ_INSERT_HEAD(&p->head, l, lines);
82 TAILQ_INSERT_TAIL(&p->head, l, lines);
88 parse_text(struct parser *p, enum line_type t, const char *buf, size_t len)
92 if ((l = calloc(1, len+1)) == NULL)
95 return emit_line(p, t, l, NULL);
99 parse_link(struct parser *p, enum line_type t, const char *buf, size_t len)
102 const char *url_start;
105 return emit_line(p, t, NULL, NULL);
109 while (len > 0 && isspace(buf[0])) {
115 return emit_line(p, t, NULL, NULL);
118 while (len > 0 && !isspace(buf[0])) {
123 if ((u = calloc(1, buf - url_start + 1)) == NULL)
125 memcpy(u, url_start, buf - url_start);
128 return emit_line(p, t, u, NULL);
136 return emit_line(p, t, u, NULL);
138 if ((l = calloc(1, len + 1)) == NULL)
142 return emit_line(p, t, u, l);
146 parse_title(struct parser *p, enum line_type t, const char *buf, size_t len)
153 return emit_line(p, t, NULL, NULL);
159 return emit_line(p, t, NULL, NULL);
165 return emit_line(p, t, NULL, NULL);
174 while (len > 0 && isspace(buf[0])) {
180 return emit_line(p, t, NULL, NULL);
182 if ((l = calloc(1, len+1)) == NULL)
185 return emit_line(p, t, l, NULL);
189 parse_item(struct parser *p, enum line_type t, const char *buf, size_t len)
194 return emit_line(p, t, NULL, NULL);
199 while (len > 0 && isspace(buf[0])) {
205 return emit_line(p, t, NULL, NULL);
207 if ((l = calloc(1, len+1)) == NULL)
210 return emit_line(p, t, l, NULL);
214 parse_quote(struct parser *p, enum line_type t, const char *buf, size_t len)
219 return emit_line(p, t, NULL, NULL);
224 while (len > 0 && isspace(buf[0])) {
230 return emit_line(p, t, NULL, NULL);
232 if ((l = calloc(1, len+1)) == NULL)
235 return emit_line(p, t, l, NULL);
239 parse_pre_start(struct parser *p, enum line_type t, const char *buf, size_t len)
244 return emit_line(p, t, NULL, NULL);
249 while (len > 0 && isspace(buf[0])) {
255 return emit_line(p, t, NULL, NULL);
257 if ((l = calloc(1, len+1)) == NULL)
261 return emit_line(p, t, NULL, l);
265 parse_pre_cnt(struct parser *p, enum line_type t, const char *buf, size_t len)
270 return emit_line(p, t, NULL, NULL);
272 if ((l = calloc(1, len+1)) == NULL)
275 return emit_line(p, t, l, NULL);
279 parse_pre_end(struct parser *p, enum line_type t, const char *buf, size_t len)
281 return emit_line(p, t, NULL, NULL);
284 static inline enum line_type
285 detect_line_type(const char *buf, size_t len, int in_pre)
294 buf[0] == '`' && buf[1] == '`' && buf[2] == '`')
297 return LINE_PRE_CONTENT;
301 case '*': return LINE_ITEM;
302 case '>': return LINE_QUOTE;
304 if (len >= 1 && buf[1] == '>')
322 if (buf[0] == '`' && buf[1] == '`' && buf[2] == '`')
323 return LINE_PRE_START;
331 append(struct parser *p, const char *buf, size_t len)
336 newlen = len + p->len;
337 if ((t = calloc(1, newlen)) == NULL)
346 set_buf(struct parser *p, const char *buf, size_t len)
354 if ((p->buf = calloc(1, len)) == NULL)
356 memcpy(p->buf, buf, len);
362 gemtext_parse(struct parser *p, const char *buf, size_t size)
372 if (!append(p, buf, size))
379 if ((e = telescope_strnchr((char*)b, '\n', len)) == NULL)
382 t = detect_line_type(b, l, p->flags);
383 if (t == LINE_PRE_START)
385 if (t == LINE_PRE_END)
387 if (!parsers[t](p, t, b, l))
400 return set_buf(p, b, len);
404 gemtext_free(struct parser *p)
408 /* flush the buffer */
410 t = detect_line_type(p->buf, p->len, p->flags);
411 if (!parsers[t](p, t, p->buf, p->len))
413 if (p->flags && !emit_line(p, LINE_PRE_END, NULL, NULL))