1 ba49fdf9 2021-07-30 op /*
  2 ba49fdf9 2021-07-30 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 ba49fdf9 2021-07-30 op  *
  4 ba49fdf9 2021-07-30 op  * Permission to use, copy, modify, and distribute this software for any
  5 ba49fdf9 2021-07-30 op  * purpose with or without fee is hereby granted, provided that the above
  6 ba49fdf9 2021-07-30 op  * copyright notice and this permission notice appear in all copies.
  7 ba49fdf9 2021-07-30 op  *
  8 ba49fdf9 2021-07-30 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 ba49fdf9 2021-07-30 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 ba49fdf9 2021-07-30 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 ba49fdf9 2021-07-30 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 ba49fdf9 2021-07-30 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 ba49fdf9 2021-07-30 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 ba49fdf9 2021-07-30 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 ba49fdf9 2021-07-30 op  */
 16 ba49fdf9 2021-07-30 op 
 17 ba49fdf9 2021-07-30 op /*
 18 ba49fdf9 2021-07-30 op  * A streaming text/x-patch parser
 19 ba49fdf9 2021-07-30 op  */
 20 ba49fdf9 2021-07-30 op 
 21 ba49fdf9 2021-07-30 op #include <stdlib.h>
 22 ba49fdf9 2021-07-30 op #include <string.h>
 23 ba49fdf9 2021-07-30 op 
 24 ba49fdf9 2021-07-30 op #include "telescope.h"
 25 ba49fdf9 2021-07-30 op #include "parser.h"
 26 9d65b1d9 2022-01-11 op #include "utils.h"
 27 ba49fdf9 2021-07-30 op 
 28 ba49fdf9 2021-07-30 op static int	tpatch_parse(struct parser *, const char *, size_t);
 29 ba49fdf9 2021-07-30 op static int	tpatch_emit_line(struct parser *, const char *, size_t);
 30 ba49fdf9 2021-07-30 op static int	tpatch_foreach_line(struct parser *, const char *, size_t);
 31 ba49fdf9 2021-07-30 op static int	tpatch_free(struct parser *);
 32 ba49fdf9 2021-07-30 op 
 33 ba49fdf9 2021-07-30 op void
 34 ba49fdf9 2021-07-30 op textpatch_initparser(struct parser *p)
 35 ba49fdf9 2021-07-30 op {
 36 ba49fdf9 2021-07-30 op 	memset(p, 0, sizeof(*p));
 37 ba49fdf9 2021-07-30 op 
 38 ba49fdf9 2021-07-30 op 	p->name = "text/x-patch";
 39 ba49fdf9 2021-07-30 op 	p->parse = &tpatch_parse;
 40 ba49fdf9 2021-07-30 op 	p->free = &tpatch_free;
 41 ba49fdf9 2021-07-30 op 
 42 ba49fdf9 2021-07-30 op 	p->flags = PARSER_IN_PATCH_HDR;
 43 78894e73 2021-08-12 op 
 44 78894e73 2021-08-12 op 	TAILQ_INIT(&p->head);
 45 ba49fdf9 2021-07-30 op }
 46 ba49fdf9 2021-07-30 op 
 47 ba49fdf9 2021-07-30 op static int
 48 ba49fdf9 2021-07-30 op tpatch_parse(struct parser *p, const char *buf, size_t size)
 49 ba49fdf9 2021-07-30 op {
 50 ba49fdf9 2021-07-30 op 	return parser_foreach_line(p, buf, size, tpatch_foreach_line);
 51 ba49fdf9 2021-07-30 op }
 52 ba49fdf9 2021-07-30 op 
 53 ba49fdf9 2021-07-30 op static int
 54 ba49fdf9 2021-07-30 op tpatch_emit_line(struct parser *p, const char *line, size_t linelen)
 55 ba49fdf9 2021-07-30 op {
 56 ba49fdf9 2021-07-30 op 	struct line *l;
 57 ba49fdf9 2021-07-30 op 
 58 ba49fdf9 2021-07-30 op 	if ((l = calloc(1, sizeof(*l))) == NULL)
 59 ba49fdf9 2021-07-30 op 		return 0;
 60 ba49fdf9 2021-07-30 op 
 61 ba49fdf9 2021-07-30 op 	if (p->flags & PARSER_IN_PATCH_HDR)
 62 ba49fdf9 2021-07-30 op 		l->type = LINE_PATCH_HDR;
 63 ba49fdf9 2021-07-30 op 	else
 64 ba49fdf9 2021-07-30 op 		l->type = LINE_PATCH;
 65 ba49fdf9 2021-07-30 op 
 66 ba49fdf9 2021-07-30 op 	if (linelen != 0) {
 67 ba49fdf9 2021-07-30 op 		if ((l->line = calloc(1, linelen+1)) == NULL) {
 68 ba49fdf9 2021-07-30 op 			free(l);
 69 ba49fdf9 2021-07-30 op 			return 0;
 70 ba49fdf9 2021-07-30 op 		}
 71 ba49fdf9 2021-07-30 op 
 72 ba49fdf9 2021-07-30 op 		memcpy(l->line, line, linelen);
 73 ba49fdf9 2021-07-30 op 
 74 ba49fdf9 2021-07-30 op 		if (!(p->flags & PARSER_IN_PATCH_HDR))
 75 ba49fdf9 2021-07-30 op 			switch (*l->line) {
 76 ba49fdf9 2021-07-30 op 			case '+':
 77 ba49fdf9 2021-07-30 op 				l->type = LINE_PATCH_ADD;
 78 ba49fdf9 2021-07-30 op 				break;
 79 ba49fdf9 2021-07-30 op 			case '-':
 80 ba49fdf9 2021-07-30 op 				l->type = LINE_PATCH_DEL;
 81 ba49fdf9 2021-07-30 op 				break;
 82 ba49fdf9 2021-07-30 op 			case '@':
 83 ba49fdf9 2021-07-30 op 				l->type = LINE_PATCH_HUNK_HDR;
 84 ba49fdf9 2021-07-30 op 				break;
 85 874e7af5 2021-09-20 op 			case ' ':
 86 874e7af5 2021-09-20 op 				/* context lines */
 87 874e7af5 2021-09-20 op 				break;
 88 874e7af5 2021-09-20 op 			default:
 89 874e7af5 2021-09-20 op 				/*
 90 874e7af5 2021-09-20 op 				 * A single patch file can have more
 91 874e7af5 2021-09-20 op 				 * than one "header" if touches more
 92 874e7af5 2021-09-20 op 				 * than one file.
 93 874e7af5 2021-09-20 op 				 */
 94 874e7af5 2021-09-20 op 				l->type = LINE_PATCH_HDR;
 95 874e7af5 2021-09-20 op 				p->flags |= PARSER_IN_PATCH_HDR;
 96 874e7af5 2021-09-20 op 				break;
 97 ba49fdf9 2021-07-30 op 			}
 98 ba49fdf9 2021-07-30 op 
 99 ba49fdf9 2021-07-30 op 		if (has_prefix(l->line, "+++"))
100 ba49fdf9 2021-07-30 op 			p->flags &= ~PARSER_IN_PATCH_HDR;
101 ba49fdf9 2021-07-30 op 	}
102 ba49fdf9 2021-07-30 op 
103 32ac17a4 2021-08-12 op 	TAILQ_INSERT_TAIL(&p->head, l, lines);
104 ba49fdf9 2021-07-30 op 
105 ba49fdf9 2021-07-30 op 	return 1;
106 ba49fdf9 2021-07-30 op }
107 ba49fdf9 2021-07-30 op 
108 ba49fdf9 2021-07-30 op static int
109 ba49fdf9 2021-07-30 op tpatch_foreach_line(struct parser *p, const char *line, size_t linelen)
110 ba49fdf9 2021-07-30 op {
111 ba49fdf9 2021-07-30 op 	return tpatch_emit_line(p, line, linelen);
112 ba49fdf9 2021-07-30 op }
113 ba49fdf9 2021-07-30 op 
114 ba49fdf9 2021-07-30 op static int
115 ba49fdf9 2021-07-30 op tpatch_free(struct parser *p)
116 ba49fdf9 2021-07-30 op {
117 ba49fdf9 2021-07-30 op 	if (p->len != 0)
118 ba49fdf9 2021-07-30 op 		return tpatch_emit_line(p, p->buf, p->len);
119 ba49fdf9 2021-07-30 op 	return 1;
120 ba49fdf9 2021-07-30 op }