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Support strikethrough via ~~

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This commit is contained in:
Nicolas Werner 2023-01-28 10:36:47 +01:00
parent 47e3257963
commit ec3ba352c0
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1 changed files with 118 additions and 0 deletions
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118
src/Utils.cpp
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@ -783,12 +783,130 @@ process_spoilers(cmark_node *node)
cmark_iter_free(iter);
}
static void
process_strikethrough(cmark_node *node)
{
auto iter = cmark_iter_new(node);
while (cmark_iter_next(iter) != CMARK_EVENT_DONE) {
cmark_node *cur = cmark_iter_get_node(iter);
// only text nodes (no code or similar)
if (cmark_node_get_type(cur) != CMARK_NODE_TEXT) {
continue;
}
std::string_view content = cmark_node_get_literal(cur);
if (auto posStart = content.find("~~"); posStart != std::string::npos) {
// we have the start of the strikethrough
if (auto posEnd = content.find("~~", posStart + 2); posEnd != std::string::npos) {
// we have the end of the strikethrough in the same node
std::string before_strike = std::string(content.substr(0, posStart));
std::string inside_strike =
std::string(content.substr(posStart + 2, posEnd - 2 - posStart));
std::string after_strike = std::string(content.substr(posEnd + 2));
// create the new nodes
auto before_node = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(before_node, before_strike.c_str());
auto after_node = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(after_node, after_strike.c_str());
auto block = cmark_node_new(cmark_node_type::CMARK_NODE_CUSTOM_INLINE);
cmark_node_set_on_enter(block, "<del>");
cmark_node_set_on_exit(block, "</del>");
auto child_node = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(child_node, inside_strike.c_str());
cmark_node_append_child(block, child_node);
// insert the new nodes into the tree
cmark_node_replace(cur, block);
cmark_node_insert_before(block, before_node);
cmark_node_insert_after(block, after_node);
// cleanup the replaced node
cmark_node_free(cur);
// fixup the iterator
cmark_iter_reset(iter, block, CMARK_EVENT_EXIT);
} else {
// no end found, but lets try sibling nodes
for (auto next = cmark_node_next(cur); next != nullptr;
next = cmark_node_next(next)) {
// only text nodes again
if (cmark_node_get_type(next) != CMARK_NODE_TEXT)
continue;
std::string_view next_content = cmark_node_get_literal(next);
if (auto posEndNext = next_content.find("~~");
posEndNext != std::string_view::npos) {
// We found the end of the strikethrough
std::string before_strike = std::string(content.substr(0, posStart));
std::string after_strike = std::string(next_content.substr(posEndNext + 2));
std::string inside_strike_start = std::string(content.substr(posStart + 2));
std::string inside_strike_end =
std::string(next_content.substr(0, posEndNext));
// save all the nodes inside the strikethrough for later
std::vector<cmark_node *> child_nodes;
for (auto kid = cmark_node_next(cur); kid != nullptr && kid != next;
kid = cmark_node_next(kid)) {
child_nodes.push_back(kid);
}
// create the new nodes
auto before_node = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(before_node, before_strike.c_str());
auto after_node = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(after_node, after_strike.c_str());
auto block = cmark_node_new(cmark_node_type::CMARK_NODE_CUSTOM_INLINE);
cmark_node_set_on_enter(block, "<del>");
cmark_node_set_on_exit(block, "</del>");
// create the content inside the strikethrough by adding the old text at the
// start and the end as well as all the existing children
auto child_node_start = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(child_node_start, inside_strike_start.c_str());
cmark_node_append_child(block, child_node_start);
for (auto &child : child_nodes)
cmark_node_append_child(block, child);
auto child_node_end = cmark_node_new(cmark_node_type::CMARK_NODE_TEXT);
cmark_node_set_literal(child_node_end, inside_strike_end.c_str());
cmark_node_append_child(block, child_node_end);
// insert the new nodes into the tree
cmark_node_replace(cur, block);
cmark_node_insert_before(block, before_node);
cmark_node_insert_after(block, after_node);
// cleanup removed nodes
cmark_node_free(cur);
cmark_node_free(next);
// fixup the iterator
cmark_iter_reset(iter, block, CMARK_EVENT_EXIT);
break;
}
}
}
}
}
cmark_iter_free(iter);
}
QString
utils::markdownToHtml(const QString &text, bool rainbowify_)
{
const auto str = text.toUtf8();
cmark_node *const node = cmark_parse_document(str.constData(), str.size(), CMARK_OPT_UNSAFE);
process_strikethrough(node);
process_spoilers(node);
if (rainbowify_) {