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LibWeb: Implement Text.splitText(offset)

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With FIXMEs about updating live ranges, but still.
This commit is contained in:
Andreas Kling 2022-03-21 18:57:10 +01:00
parent 8bc3f4c186
commit d2f9f8bd4f
3 changed files with 53 additions and 0 deletions
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48
Userland/Libraries/LibWeb/DOM/Text.cpp
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@ -27,4 +27,52 @@ void Text::set_owner_input_element(Badge<HTML::HTMLInputElement>, HTML::HTMLInpu
m_owner_input_element = input_element;
}
// https://dom.spec.whatwg.org/#dom-text-splittext
// https://dom.spec.whatwg.org/#concept-text-split
ExceptionOr<NonnullRefPtr<Text>> Text::split_text(size_t offset)
{
// 1. Let length be node’s length.
auto length = this->length();
// 2. If offset is greater than length, then throw an "IndexSizeError" DOMException.
if (offset > length)
return DOM::IndexSizeError::create("Split offset is greater than length");
// 3. Let count be length minus offset.
auto count = length - offset;
// 4. Let new data be the result of substringing data with node node, offset offset, and count count.
auto new_data_or_error = substring_data(offset, count);
if (new_data_or_error.is_exception())
return new_data_or_error.exception();
auto new_data = new_data_or_error.release_value();
// 5. Let new node be a new Text node, with the same node document as node. Set new node’s data to new data.
auto new_node = adopt_ref(*new Text(document(), new_data));
// 6. Let parent be node’s parent.
RefPtr<Node> parent = this->parent();
// 7. If parent is not null, then:
if (parent) {
// 1. Insert new node into parent before node’s next sibling.
parent->insert_before(new_node, next_sibling());
// FIXME: 2. For each live range whose start node is node and start offset is greater than offset, set its start node to new node and decrease its start offset by offset.
// FIXME: 3. For each live range whose end node is node and end offset is greater than offset, set its end node to new node and decrease its end offset by offset.
// FIXME: 4. For each live range whose start node is parent and start offset is equal to the index of node plus 1, increase its start offset by 1.
// FIXME: 5. For each live range whose end node is parent and end offset is equal to the index of node plus 1, increase its end offset by 1.
}
// 8. Replace data with node node, offset offset, count count, and data the empty string.
if (auto result = replace_data(offset, count, ""); result.is_exception())
return result.exception();
// 9. Return new node.
return new_node;
}
}