1 75a8a1ec 2022-02-08 op /*
  2 75a8a1ec 2022-02-08 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 75a8a1ec 2022-02-08 op  *
  4 75a8a1ec 2022-02-08 op  * Permission to use, copy, modify, and distribute this software for any
  5 75a8a1ec 2022-02-08 op  * purpose with or without fee is hereby granted, provided that the above
  6 75a8a1ec 2022-02-08 op  * copyright notice and this permission notice appear in all copies.
  7 75a8a1ec 2022-02-08 op  *
  8 75a8a1ec 2022-02-08 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 75a8a1ec 2022-02-08 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 75a8a1ec 2022-02-08 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 75a8a1ec 2022-02-08 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 75a8a1ec 2022-02-08 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 75a8a1ec 2022-02-08 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 75a8a1ec 2022-02-08 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 75a8a1ec 2022-02-08 op  */
 16 75a8a1ec 2022-02-08 op 
 17 75a8a1ec 2022-02-08 op #include "compat.h"
 18 75a8a1ec 2022-02-08 op 
 19 75a8a1ec 2022-02-08 op #include <stdlib.h>
 20 75a8a1ec 2022-02-08 op #include <string.h>
 21 75a8a1ec 2022-02-08 op 
 22 75a8a1ec 2022-02-08 op #include "parser.h"
 23 75a8a1ec 2022-02-08 op #include "telescope.h"
 24 75a8a1ec 2022-02-08 op 
 25 75a8a1ec 2022-02-08 op void
 26 75a8a1ec 2022-02-08 op parser_init(struct tab *tab, parserfn fn)
 27 75a8a1ec 2022-02-08 op {
 28 75a8a1ec 2022-02-08 op 	erase_buffer(&tab->buffer);
 29 75a8a1ec 2022-02-08 op 	fn(&tab->buffer.page);
 30 75a8a1ec 2022-02-08 op 	tab->buffer.page.init = fn;
 31 75a8a1ec 2022-02-08 op }
 32 75a8a1ec 2022-02-08 op 
 33 75a8a1ec 2022-02-08 op int
 34 75a8a1ec 2022-02-08 op parser_parse(struct tab *tab, const char *chunk, size_t len)
 35 75a8a1ec 2022-02-08 op {
 36 75a8a1ec 2022-02-08 op 	return tab->buffer.page.parse(&tab->buffer.page, chunk, len);
 37 75a8a1ec 2022-02-08 op }
 38 75a8a1ec 2022-02-08 op 
 39 75a8a1ec 2022-02-08 op int
 40 75a8a1ec 2022-02-08 op parser_free(struct tab *tab)
 41 75a8a1ec 2022-02-08 op {
 42 75a8a1ec 2022-02-08 op 	int	 r;
 43 75a8a1ec 2022-02-08 op 	char	*tilde, *slash;
 44 75a8a1ec 2022-02-08 op 
 45 75a8a1ec 2022-02-08 op 	r = tab->buffer.page.free(&tab->buffer.page);
 46 75a8a1ec 2022-02-08 op 
 47 75a8a1ec 2022-02-08 op 	if (*tab->buffer.page.title != '\0')
 48 75a8a1ec 2022-02-08 op 		return r;
 49 75a8a1ec 2022-02-08 op 
 50 75a8a1ec 2022-02-08 op 	/*
 51 75a8a1ec 2022-02-08 op 	 * heuristic: see if there is a "tilde user" and use that as
 52 75a8a1ec 2022-02-08 op 	 * page title, using the full domain name as fallback.
 53 75a8a1ec 2022-02-08 op 	 */
 54 75a8a1ec 2022-02-08 op 	if ((tilde = strstr(tab->hist_cur->h, "/~")) != NULL) {
 55 75a8a1ec 2022-02-08 op 		strlcpy(tab->buffer.page.title, tilde+1,
 56 75a8a1ec 2022-02-08 op 		    sizeof(tab->buffer.page.title));
 57 75a8a1ec 2022-02-08 op 
 58 75a8a1ec 2022-02-08 op 		if ((slash = strchr(tab->buffer.page.title, '/')) != NULL)
 59 75a8a1ec 2022-02-08 op 			*slash = '\0';
 60 75a8a1ec 2022-02-08 op 	} else
 61 75a8a1ec 2022-02-08 op 		strlcpy(tab->buffer.page.title, tab->uri.host,
 62 75a8a1ec 2022-02-08 op 		    sizeof(tab->buffer.page.title));
 63 75a8a1ec 2022-02-08 op 
 64 75a8a1ec 2022-02-08 op 	return r;
 65 75a8a1ec 2022-02-08 op }
 66 75a8a1ec 2022-02-08 op 
 67 75a8a1ec 2022-02-08 op int
 68 75a8a1ec 2022-02-08 op parser_serialize(struct tab *tab, struct evbuffer *evb)
 69 75a8a1ec 2022-02-08 op {
 70 75a8a1ec 2022-02-08 op 	struct line	*line;
 71 75a8a1ec 2022-02-08 op 	const char	*text;
 72 75a8a1ec 2022-02-08 op 	int		 r;
 73 75a8a1ec 2022-02-08 op 
 74 75a8a1ec 2022-02-08 op 	if (tab->buffer.page.serialize != NULL)
 75 75a8a1ec 2022-02-08 op 		return tab->buffer.page.serialize(&tab->buffer.page, evb);
 76 75a8a1ec 2022-02-08 op 
 77 75a8a1ec 2022-02-08 op 	/* a default implementation good enough for plain text */
 78 75a8a1ec 2022-02-08 op 	TAILQ_FOREACH(line, &tab->buffer.page.head, lines) {
 79 75a8a1ec 2022-02-08 op 		if ((text = line->line) == NULL)
 80 75a8a1ec 2022-02-08 op 			text = "";
 81 75a8a1ec 2022-02-08 op 
 82 75a8a1ec 2022-02-08 op 		r = evbuffer_add_printf(evb, "%s\n", text);
 83 75a8a1ec 2022-02-08 op 		if (r == -1)
 84 75a8a1ec 2022-02-08 op 			return 0;
 85 75a8a1ec 2022-02-08 op 	}
 86 75a8a1ec 2022-02-08 op 
 87 75a8a1ec 2022-02-08 op 	return 1;
 88 75a8a1ec 2022-02-08 op }
 89 75a8a1ec 2022-02-08 op 
 90 75a8a1ec 2022-02-08 op int
 91 75a8a1ec 2022-02-08 op parser_append(struct parser *p, const char *buf, size_t len)
 92 75a8a1ec 2022-02-08 op {
 93 75a8a1ec 2022-02-08 op 	size_t newlen;
 94 75a8a1ec 2022-02-08 op 	char *t;
 95 75a8a1ec 2022-02-08 op 
 96 75a8a1ec 2022-02-08 op 	newlen = len + p->len;
 97 75a8a1ec 2022-02-08 op 	if ((t = calloc(1, newlen)) == NULL)
 98 75a8a1ec 2022-02-08 op 		return 0;
 99 75a8a1ec 2022-02-08 op 	memcpy(t, p->buf, p->len);
100 75a8a1ec 2022-02-08 op 	memcpy(t + p->len, buf, len);
101 75a8a1ec 2022-02-08 op 	free(p->buf);
102 75a8a1ec 2022-02-08 op 	p->buf = t;
103 75a8a1ec 2022-02-08 op 	p->len = newlen;
104 75a8a1ec 2022-02-08 op 	return 1;
105 75a8a1ec 2022-02-08 op }
106 75a8a1ec 2022-02-08 op 
107 75a8a1ec 2022-02-08 op int
108 75a8a1ec 2022-02-08 op parser_set_buf(struct parser *p, const char *buf, size_t len)
109 75a8a1ec 2022-02-08 op {
110 75a8a1ec 2022-02-08 op 	char *tmp;
111 75a8a1ec 2022-02-08 op 
112 75a8a1ec 2022-02-08 op 	if (len == 0) {
113 75a8a1ec 2022-02-08 op 		p->len = 0;
114 75a8a1ec 2022-02-08 op 		free(p->buf);
115 75a8a1ec 2022-02-08 op 		p->buf = NULL;
116 75a8a1ec 2022-02-08 op 		return 1;
117 75a8a1ec 2022-02-08 op 	}
118 75a8a1ec 2022-02-08 op 
119 75a8a1ec 2022-02-08 op 	/*
120 75a8a1ec 2022-02-08 op 	 * p->buf and buf can (and probably almost always will)
121 75a8a1ec 2022-02-08 op 	 * overlap!
122 75a8a1ec 2022-02-08 op 	 */
123 75a8a1ec 2022-02-08 op 
124 75a8a1ec 2022-02-08 op 	if ((tmp = calloc(1, len)) == NULL)
125 75a8a1ec 2022-02-08 op 		return 0;
126 75a8a1ec 2022-02-08 op 	memcpy(tmp, buf, len);
127 75a8a1ec 2022-02-08 op 	free(p->buf);
128 75a8a1ec 2022-02-08 op 	p->buf = tmp;
129 75a8a1ec 2022-02-08 op 	p->len = len;
130 75a8a1ec 2022-02-08 op 	return 1;
131 75a8a1ec 2022-02-08 op }
132 75a8a1ec 2022-02-08 op 
133 75a8a1ec 2022-02-08 op int
134 75a8a1ec 2022-02-08 op parser_foreach_line(struct parser *p, const char *buf, size_t size,
135 75a8a1ec 2022-02-08 op     parsechunkfn fn)
136 75a8a1ec 2022-02-08 op {
137 75a8a1ec 2022-02-08 op 	char		*b, *e;
138 75a8a1ec 2022-02-08 op 	unsigned int	 ch;
139 75a8a1ec 2022-02-08 op 	size_t		 i, l, len;
140 75a8a1ec 2022-02-08 op 
141 75a8a1ec 2022-02-08 op 	if (!parser_append(p, buf, size))
142 75a8a1ec 2022-02-08 op 		return 0;
143 75a8a1ec 2022-02-08 op 	b = p->buf;
144 75a8a1ec 2022-02-08 op 	len = p->len;
145 75a8a1ec 2022-02-08 op 
146 75a8a1ec 2022-02-08 op 	if (!(p->flags & PARSER_IN_BODY) && len < 3)
147 75a8a1ec 2022-02-08 op 		return 1;
148 75a8a1ec 2022-02-08 op 
149 75a8a1ec 2022-02-08 op 	if (!(p->flags & PARSER_IN_BODY)) {
150 75a8a1ec 2022-02-08 op 		p->flags |= PARSER_IN_BODY;
151 75a8a1ec 2022-02-08 op 
152 75a8a1ec 2022-02-08 op 		/*
153 75a8a1ec 2022-02-08 op 		 * drop the BOM: only UTF-8 is supported, and there
154 75a8a1ec 2022-02-08 op 		 * it's useless; some editors may still add one
155 75a8a1ec 2022-02-08 op 		 * though.
156 75a8a1ec 2022-02-08 op 		 */
157 75a8a1ec 2022-02-08 op 		if (memmem(b, len, "\xEF\xBB\xBF", 3) == b) {
158 75a8a1ec 2022-02-08 op 			b += 3;
159 75a8a1ec 2022-02-08 op 			len -= 3;
160 75a8a1ec 2022-02-08 op 		}
161 75a8a1ec 2022-02-08 op 	}
162 75a8a1ec 2022-02-08 op 
163 75a8a1ec 2022-02-08 op 	/* drop every "funny" ASCII character */
164 75a8a1ec 2022-02-08 op 	for (i = 0; i < len; ) {
165 75a8a1ec 2022-02-08 op 		ch = b[i];
166 75a8a1ec 2022-02-08 op 		if ((ch >= ' ' || ch == '\n' || ch == '\t')
167 75a8a1ec 2022-02-08 op 		    && ch != 127) { /* del */
168 75a8a1ec 2022-02-08 op 			++i;
169 75a8a1ec 2022-02-08 op 			continue;
170 75a8a1ec 2022-02-08 op 		}
171 75a8a1ec 2022-02-08 op 		memmove(&b[i], &b[i+1], len - i - 1);
172 75a8a1ec 2022-02-08 op 		len--;
173 75a8a1ec 2022-02-08 op 	}
174 75a8a1ec 2022-02-08 op 
175 75a8a1ec 2022-02-08 op 	while (len > 0) {
176 75a8a1ec 2022-02-08 op 		if ((e = memmem((char*)b, len, "\n", 1)) == NULL)
177 75a8a1ec 2022-02-08 op 			break;
178 75a8a1ec 2022-02-08 op 		l = e - b;
179 75a8a1ec 2022-02-08 op 
180 75a8a1ec 2022-02-08 op 		if (!fn(p, b, l))
181 75a8a1ec 2022-02-08 op 			return 0;
182 75a8a1ec 2022-02-08 op 
183 75a8a1ec 2022-02-08 op 		len -= l;
184 75a8a1ec 2022-02-08 op 		b += l;
185 75a8a1ec 2022-02-08 op 
186 75a8a1ec 2022-02-08 op 		if (len > 0) {
187 75a8a1ec 2022-02-08 op 			/* skip \n */
188 75a8a1ec 2022-02-08 op 			len--;
189 75a8a1ec 2022-02-08 op 			b++;
190 75a8a1ec 2022-02-08 op 		}
191 75a8a1ec 2022-02-08 op 	}
192 75a8a1ec 2022-02-08 op 
193 75a8a1ec 2022-02-08 op 	return parser_set_buf(p, b, len);
194 75a8a1ec 2022-02-08 op }