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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 = strspn(line, "\t");
if (tag_len > len)
len = tag_len;
return strncmp(tag, line, len);
}
}
return -1;
}
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");
fseek(file, 0, SEEK_END);
size_t file_size = (size_t)ftell(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;
}
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