size_t text_customword_start_prev(Text *txt, size_t pos, int (*isboundary)(int)) {
char c;
Iterator it = text_iterator_get(txt, pos);
while (text_iterator_char_prev(&it, &c) && space(c));
if (boundary(c))
do pos = it.pos; while (text_iterator_char_prev(&it, &c) && boundary(c) && !space(c));
else
do pos = it.pos; while (text_iterator_char_prev(&it, &c) && !boundary(c));
return pos;
}
size_t text_customword_end_prev(Text *txt, size_t pos, int (*isboundary)(int)) {
char c;
Iterator it = text_iterator_get(txt, pos);
if (!text_iterator_byte_get(&it, &c))
return pos;
if (boundary(c))
while (boundary(c) && !space(c) && text_iterator_char_prev(&it, &c));
else
while (!boundary(c) && text_iterator_char_prev(&it, &c));
while (space(c) && text_iterator_char_prev(&it, &c));
return it.pos;
}
size_t text_line_char_prev(Text *txt, size_t pos) {
char c;
Iterator it = text_iterator_get(txt, pos);
if (!text_iterator_char_prev(&it, &c) || c == '\n')
return pos;
return it.pos;
}
size_t text_line_lastchar(Text *txt, size_t pos) {
char c;
Iterator it = text_iterator_get(txt, text_line_end(txt, pos));
if (text_iterator_char_prev(&it, &c) && c == '\n')
text_iterator_byte_next(&it, NULL);
return it.pos;
}
size_t text_line_finish(Text *txt, size_t pos) {
char c;
Iterator it = text_iterator_get(txt, text_line_end(txt, pos));
do text_iterator_char_prev(&it, NULL);
while (text_iterator_byte_get(&it, &c) && c != '\n' && space(c));
return it.pos;
}
Filerange text_object_range(Text *txt, size_t pos, int (*isboundary)(int)) {
char c;
size_t start;
Iterator it = text_iterator_get(txt, pos), rit = it;
if (!text_iterator_byte_get(&rit, &c) || boundary(c))
return text_range_empty();
char tmp = c;
do start = rit.pos;
while (text_iterator_char_prev(&rit, &c) && !boundary(c));
for (c = tmp; !boundary(c) && text_iterator_byte_next(&it, &c););
return text_range_new(start, it.pos);
}
size_t text_char_prev(Text *txt, size_t pos) {
Iterator it = text_iterator_get(txt, pos);
text_iterator_char_prev(&it, NULL);
return it.pos;
}
