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Add additional superscripting support. #70

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Add additional superscripting support. #70

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28 changes: 23 additions & 5 deletions src/markdown.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1145,7 +1145,7 @@ char_link(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset
static size_t
char_superscript(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
{
size_t sup_start, sup_len;
size_t sup_start, sup_len, brk_offset, num_brks;
struct buf *sup;

if (!rndr->cb.superscript)
Expand All @@ -1154,14 +1154,32 @@ char_superscript(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t
if (size < 2)
return 0;

if (data[1] == '(') {
sup_start = sup_len = 2;

while (sup_len < size && data[sup_len] != ')' && data[sup_len - 1] != '\\')
// find a bracket after a string of carets
brk_offset = 0;
while (brk_offset < size && data[brk_offset] == '^')
brk_offset++;

if (brk_offset < size && data[brk_offset] == '(') {
if (brk_offset == 1)
sup_start = sup_len = 2; // original behaviour
else
sup_start = sup_len = 1; // to parse additional carets later

num_brks = 0; // enable wrapped brackets inside ^()
while (sup_len < size) {
if (num_brks == 0 && data[sup_len] == ')' && data[sup_len - 1] != '\\') break;
if (sup_len > brk_offset) {
if (num_brks > 0 && data[sup_len] == ')' && data[sup_len - 1] != '\\') num_brks--;
else if (data[sup_len] == '(' && data[sup_len - 1] != '\\') num_brks++;
}
sup_len++;
}

if (sup_len == size)
return 0;

if (brk_offset > 1)
sup_len++; // to parse additional carets later
} else {
sup_start = sup_len = 1;

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12 changes: 12 additions & 0 deletions test_snudown.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,18 @@
r'Escape\^superscript':
'<p>Escape^superscript</p>\n',

r'^(Multiple words superscript)':
'<p><sup>Multiple words superscript</sup></p>\n',

r'^^^^(Multiple words superscript)':
'<p><sup><sup><sup><sup>Multiple words superscript</sup></sup></sup></sup></p>\n',

r'^^^^(Multiple words ^^(and even higher) superscript)':
'<p><sup><sup><sup><sup>Multiple words <sup><sup>and even higher</sup></sup> superscript</sup></sup></sup></sup></p>\n',

r'^^^^(Multiple words (without escaping brackets) superscript)':
'<p><sup><sup><sup><sup>Multiple words (without escaping brackets) superscript</sup></sup></sup></sup></p>\n',

r'~~normal strikethrough~~':
'<p><del>normal strikethrough</del></p>\n',

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