1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
static int tag_try(FILE *fp, char const *tag) {
if (ftell(fp) != 0) {
while (1) {
int c = getc(fp);
if (c == EOF || c == '\n')
break;
}
}
size_t tag_len = strlen(tag);
if (!feof(fp)) {
char line[256];
long pos = ftell(fp);
if (fgets(line, sizeof line, fp)) {
fseek(fp, pos, SEEK_SET);
size_t len = strcspn(line, "\t");
if (tag_len > len)
len = tag_len;
return strncmp(tag, line, len);
}
}
return -1;
}
// returns true if the tag exists.
bool tag_goto(Ted *ted, char const *tag) {
change_directory(ted->cwd);
Settings const *settings = &ted->settings;
char const *tags_filename = settings->tags_filename;
FILE *file = fopen(tags_filename, "rb");
if (!file) {
ted_seterr(ted, "No tags file. Try running ctags.");
return false;
}
fseek(file, 0, SEEK_END);
size_t file_size = (size_t)ftell(file);
// binary search for tag in file
size_t lo = 0;
size_t hi = file_size;
bool success = false;
while (lo < hi) {
size_t mid = (lo + hi)/2;
fseek(file, (long)mid, SEEK_SET);
int cmp = tag_try(file, tag);
if (cmp > 0) {
lo = mid+1;
} else if (cmp < 0) {
hi = mid;
} else {
// we found it!
char tag_enty[1024];
if (fgets(tag_enty, sizeof tag_enty, file)) {
// the tag is of the format:
// tag name\tfile name\taddress
// or
// tag name\tfile name\taddress;" additional information
char *name = tag_enty;
char *name_end = strchr(name, '\t');
if (name_end) {
*name_end = '\0';
char *filename = name_end + 1;
char *filename_end = strchr(filename, '\t');
if (filename_end) {
*filename_end = '\0';
char *address = filename_end + 1;
char *address_end = address;
int backslashes = 0;
while (1) {
bool is_end = false;
switch (*address_end) {
case '\n':
case '\r':
is_end = true;
break;
case '\\':
++backslashes;
break;
case '/':
if (address_end != address && backslashes % 2 == 0)
is_end = true;
break;
}
if (is_end) break;
if (*address_end != '\\') backslashes = 0;
++address_end;
}
*address_end = '\0';
if (address_end - address > 2 && address_end[-2] == ';' && address_end[-1] == '"') {
address_end[-2] = '\0';
}
assert(streq(name, tag));
char path[TED_PATH_MAX];
ted_full_path(ted, filename, path, sizeof path);
if (ted_open_file(ted, path)) {
TextBuffer *buffer = ted->active_buffer;
int line_number = atoi(address);
if (line_number > 0) {
// the tags file gives us a line number
BufferPos pos = {.line = (u32)line_number, .index = 0};
buffer_cursor_move_to_pos(buffer, pos);
success = true;
} else if (address[0] == '/') {
// the tags file gives us a pattern to look for
char *pattern = address + 1;
// the patterns seem to be always literal (not regex-y), except for ^ and $
bool start_anchored = false, end_anchored = false;
if (*pattern == '^') {
start_anchored = true;
++pattern;
}
char *dollar = strchr(pattern, '$');
if (dollar) {
end_anchored = true;
*dollar = '\0';
}
String32 pattern32 = str32_from_utf8(pattern);
u32 options = PCRE2_LITERAL;
if (start_anchored) options |= PCRE2_ANCHORED;
if (end_anchored) options |= PCRE2_ENDANCHORED;
int error_code;
PCRE2_SIZE error_offset;
pcre2_code *code = pcre2_compile(pattern32.str, pattern32.len,
options, &error_code, &error_offset, NULL);
if (code) {
pcre2_match_data *match_data = pcre2_match_data_create(10, NULL);
if (match_data) {
for (u32 line_idx = 0; line_idx < buffer->nlines; ++line_idx) {
Line *line = &buffer->lines[line_idx];
int n = pcre2_match(code, line->str, line->len, 0, PCRE2_NOTEMPTY,
match_data, NULL);
if (n == 1) {
// found it!
PCRE2_SIZE *ovector = pcre2_get_ovector_pointer(match_data);
PCRE2_SIZE index = ovector[0];
BufferPos pos = {line_idx, (u32)index};
buffer_cursor_move_to_pos(buffer, pos);
buffer->center_cursor_next_frame = true;
break;
}
}
pcre2_match_data_free(match_data);
}
pcre2_code_free(code);
}
str32_free(&pattern32);
} else {
ted_seterr(ted, "Unrecognized tag address: %s", address);
}
break;
}
}
}
}
}
}
fclose(file);
return success;
}
|
