srctree

// We only check the parent and up here, and if they all match, we fall

// through and check this node.

auto const *current = node.parent;

for (auto part : parts) {

part = util::trim(part);

// TODO(robinlinden): Handle descendant and child combinators in the same selector.

if (part.contains(' ')) {

return false;

}

 

if (current == nullptr || !is_match(*current, part)) {

return false;

}

 

current = current->parent;

}

}

 

// https://developer.mozilla.org/en-US/docs/Web/CSS/Descendant_combinator

if (selector_.contains(' ')) {

// TODO(robinlinden): std::views::reverse and friends when we drop Clang 14 and 15.

auto parts = util::split(selector_, " ");

selector_ = util::trim(parts.back());

parts.pop_back();

std::ranges::reverse(parts);

 

while (current != nullptr && !is_match(*current, util::trim(part))) {

current = current->parent;

}

 

if (current == nullptr) {

etest::test("is_match: descendant", [] {

using style::StyledNode;

// DOM for div[.logo] { span { a } }

dom::Element dom = dom::Element{"div", {{"class", "logo"}}, {dom::Element{"span", {}, {dom::Element{"a"}}}}};

StyledNode node{dom, {}, {{dom.children[0], {}, {{std::get<dom::Element>(dom.children[0]).children[0]}}}}};

node.children[0].parent = &node;

node.children[0].children[0].parent = &node.children[0];

 

expect(style::is_match(node.children[0], ".logo span"sv));

expect(style::is_match(node.children[0], "div span"sv));

expect(!style::is_match(node, ".logo span"sv));

 

std::get<dom::Element>(dom.children[0]).attributes["class"] = "ohno";

expect(style::is_match(node.children[0], ".logo .ohno"sv));

expect(style::is_match(node.children[0], ".logo span"sv));

 

expect(style::is_match(node.children[0].children[0], "div a"sv));

expect(style::is_match(node.children[0].children[0], ".logo a"sv));

expect(style::is_match(node.children[0].children[0], "span a"sv));

expect(style::is_match(node.children[0].children[0], ".ohno a"sv));

expect(style::is_match(node.children[0].children[0], "div span a"sv));

expect(style::is_match(node.children[0].children[0], ".logo span a"sv));

expect(style::is_match(node.children[0].children[0], "div .ohno a"sv));

expect(style::is_match(node.children[0].children[0], ".logo .ohno a"sv));

});