/* char_emphasis • single and double emphasis parsing */
static size_t
char_emphasis(struct buf *ob, struct render *rndr, char *data, size_t offset, size_t size)
{
char c = data[0];
size_t ret;
if (size > 2 && data[1] != c) {
/* whitespace cannot follow an opening emphasis;
* strikethrough only takes two characters '~~' */
if (c == '~' || isspace(data[1]) || (ret = parse_emph1(ob, rndr, data + 1, size - 1, c)) == 0)
return 0;
return ret + 1;
}
if (size > 3 && data[1] == c && data[2] != c) {
if (isspace(data[2]) || (ret = parse_emph2(ob, rndr, data + 2, size - 2, c)) == 0)
return 0;
return ret + 2;
}
if (size > 4 && data[1] == c && data[2] == c && data[3] != c) {
if (c == '~' || isspace(data[3]) || (ret = parse_emph3(ob, rndr, data + 3, size - 3, c)) == 0)
return 0;
return ret + 3;
}
return 0;
}
/* char_emphasis • single and double emphasis parsing */
static size_t
char_emphasis(struct buf *ob, struct render *rndr,
char *data, size_t offset, size_t size) {
char c = data[0];
size_t ret;
if (size > 2 && data[1] != c) {
/* whitespace cannot follow an opening emphasis */
if (data[1] == ' ' || data[1] == '\t' || data[1] == '\n'
|| (ret = parse_emph1(ob, rndr, data + 1, size - 1, c)) == 0)
return 0;
return ret + 1; }
if (size > 3 && data[1] == c && data[2] != c) {
if (data[2] == ' ' || data[2] == '\t' || data[2] == '\n'
|| (ret = parse_emph2(ob, rndr, data + 2, size - 2, c)) == 0)
return 0;
return ret + 2; }
if (size > 4 && data[1] == c && data[2] == c && data[3] != c) {
if (data[3] == ' ' || data[3] == '\t' || data[3] == '\n'
|| (ret = parse_emph3(ob, rndr, data + 3, size - 3, c)) == 0)
return 0;
return ret + 3; }
return 0; }
/* finds the first closing tag, and delegates to the other emph */
static size_t
parse_emph3(struct buf *ob, struct render *rndr, char *data, size_t size, char c)
{
size_t i = 0, len;
int r;
while (i < size) {
len = find_emph_char(data + i, size - i, c);
if (!len) return 0;
i += len;
/* skip whitespace preceded symbols */
if (data[i] != c || isspace(data[i - 1]))
continue;
if (i + 2 < size && data[i + 1] == c && data[i + 2] == c && rndr->make.triple_emphasis) {
/* triple symbol found */
struct buf *work = rndr_newbuf(rndr);
parse_inline(work, rndr, data, i);
r = rndr->make.triple_emphasis(ob, work, rndr->make.opaque);
rndr_popbuf(rndr);
return r ? i + 3 : 0;
} else if (i + 1 < size && data[i + 1] == c) {
/* double symbol found, handing over to emph1 */
len = parse_emph1(ob, rndr, data - 2, size + 2, c);
if (!len) return 0;
else return len - 2;
} else {
/* single symbol found, handing over to emph2 */
len = parse_emph2(ob, rndr, data - 1, size + 1, c);
if (!len) return 0;
else return len - 1;
}
}
return 0;
}
