1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
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.
7  *
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.
15  */
16 
17 /*
18  * A streaming text/x-patch parser
19  */
20 
21 #include "compat.h"
22 
23 #include <stdlib.h>
24 #include <string.h>
25 
26 #include "parser.h"
27 #include "telescope.h"
28 #include "utils.h"
29 #include "xwrapper.h"
30 
31 static int	tpatch_emit_line(struct buffer *, const char *, size_t);
32 static int	tpatch_parse_line(struct buffer *, const char *, size_t);
33 
34 const struct parser textpatch_parser = {
35 	.name = "text/x-patch",
36 	.parseline = &tpatch_parse_line,
37 	.initflags = PARSER_IN_PATCH_HDR,
38 };
39 
40 static int
41 tpatch_emit_line(struct buffer *b, const char *line, size_t linelen)
42 {
43 	struct line *l;
44 
45 	l = xcalloc(1, sizeof(*l));
46 
47 	if (b->parser_flags & PARSER_IN_PATCH_HDR)
48 		l->type = LINE_PATCH_HDR;
49 	else
50 		l->type = LINE_PATCH;
51 
52 	if (linelen != 0) {
53 		l->line = xcalloc(1, linelen + 1);
54 
55 		memcpy(l->line, line, linelen);
56 
57 		if (!(b->parser_flags & PARSER_IN_PATCH_HDR))
58 			switch (*l->line) {
59 			case '+':
60 				l->type = LINE_PATCH_ADD;
61 				break;
62 			case '-':
63 				l->type = LINE_PATCH_DEL;
64 				break;
65 			case '@':
66 				l->type = LINE_PATCH_HUNK_HDR;
67 				break;
68 			case ' ':
69 				/* context lines */
70 				break;
71 			default:
72 				/*
73 				 * A single patch file can have more
74 				 * than one "header" if touches more
75 				 * than one file.
76 				 */
77 				l->type = LINE_PATCH_HDR;
78 				b->parser_flags |= PARSER_IN_PATCH_HDR;
79 				break;
80 			}
81 
82 		if (!strncmp(l->line, "+++", 3))
83 			b->parser_flags &= ~PARSER_IN_PATCH_HDR;
84 	}
85 
86 	TAILQ_INSERT_TAIL(&b->head, l, lines);
87 
88 	return 1;
89 }
90 
91 static int
92 tpatch_parse_line(struct buffer *b, const char *line, size_t linelen)
93 {
94 	return tpatch_emit_line(b, line, linelen);
95 }