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->name = "text/gemini";
64 p->parse = &gemtext_parse;
65 p->free = &gemtext_free;
69 emit_line(struct parser *p, enum line_type type, char *line, char *alt)
73 if ((l = calloc(1, sizeof(*l))) == NULL)
80 if (TAILQ_EMPTY(&p->head))
81 TAILQ_INSERT_HEAD(&p->head, l, lines);
83 TAILQ_INSERT_TAIL(&p->head, l, lines);
89 parse_text(struct parser *p, enum line_type t, const char *buf, size_t len)
93 if ((l = calloc(1, len+1)) == NULL)
96 return emit_line(p, t, l, NULL);
100 parse_link(struct parser *p, enum line_type t, const char *buf, size_t len)
103 const char *url_start;
106 return emit_line(p, t, NULL, NULL);
110 while (len > 0 && isspace(buf[0])) {
116 return emit_line(p, t, NULL, NULL);
119 while (len > 0 && !isspace(buf[0])) {
124 if ((u = calloc(1, buf - url_start + 1)) == NULL)
126 memcpy(u, url_start, buf - url_start);
131 while (len > 0 && isspace(buf[0])) {
139 if ((l = calloc(1, len + 1)) == NULL)
143 return emit_line(p, t, l, u);
146 if ((l = strdup(u)) == NULL)
148 return emit_line(p, t, l, u);
152 parse_title(struct parser *p, enum line_type t, const char *buf, size_t len)
159 return emit_line(p, t, NULL, NULL);
165 return emit_line(p, t, NULL, NULL);
171 return emit_line(p, t, NULL, NULL);
180 while (len > 0 && isspace(buf[0])) {
186 return emit_line(p, t, NULL, NULL);
188 if ((l = calloc(1, len+1)) == NULL)
191 return emit_line(p, t, l, NULL);
195 parse_item(struct parser *p, enum line_type t, const char *buf, size_t len)
200 return emit_line(p, t, NULL, NULL);
205 while (len > 0 && isspace(buf[0])) {
211 return emit_line(p, t, NULL, NULL);
213 if ((l = calloc(1, len+1)) == NULL)
216 return emit_line(p, t, l, NULL);
220 parse_quote(struct parser *p, enum line_type t, const char *buf, size_t len)
225 return emit_line(p, t, NULL, NULL);
230 while (len > 0 && isspace(buf[0])) {
236 return emit_line(p, t, NULL, NULL);
238 if ((l = calloc(1, len+1)) == NULL)
241 return emit_line(p, t, l, NULL);
245 parse_pre_start(struct parser *p, enum line_type t, const char *buf, size_t len)
250 return emit_line(p, t, NULL, NULL);
255 while (len > 0 && isspace(buf[0])) {
261 return emit_line(p, t, NULL, NULL);
263 if ((l = calloc(1, len+1)) == NULL)
267 return emit_line(p, t, NULL, l);
271 parse_pre_cnt(struct parser *p, enum line_type t, const char *buf, size_t len)
276 return emit_line(p, t, NULL, NULL);
278 if ((l = calloc(1, len+1)) == NULL)
281 return emit_line(p, t, l, NULL);
285 parse_pre_end(struct parser *p, enum line_type t, const char *buf, size_t len)
287 return emit_line(p, t, NULL, NULL);
290 static inline enum line_type
291 detect_line_type(const char *buf, size_t len, int in_pre)
300 buf[0] == '`' && buf[1] == '`' && buf[2] == '`')
303 return LINE_PRE_CONTENT;
307 case '*': return LINE_ITEM;
308 case '>': return LINE_QUOTE;
310 if (len >= 1 && buf[1] == '>')
328 if (buf[0] == '`' && buf[1] == '`' && buf[2] == '`')
329 return LINE_PRE_START;
337 gemtext_parse(struct parser *p, const char *buf, size_t size)
347 if (!parser_append(p, buf, size))
354 if ((e = telescope_strnchr((char*)b, '\n', len)) == NULL)
357 t = detect_line_type(b, l, p->flags);
358 if (t == LINE_PRE_START)
360 if (t == LINE_PRE_END)
362 if (!parsers[t](p, t, b, l))
375 return parser_set_buf(p, b, len);
379 gemtext_free(struct parser *p)
383 /* flush the buffer */
385 t = detect_line_type(p->buf, p->len, p->flags);
386 if (!parsers[t](p, t, p->buf, p->len))
388 if (p->flags && !emit_line(p, LINE_PRE_END, NULL, NULL))