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@@ -7,5 +7,100 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
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{
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Vector<NonnullRefPtr<StyleRule>> rules;
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+ enum class State {
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+ Free,
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+ InSelectorComponent,
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+ InPropertyName,
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+ InPropertyValue,
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+ };
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+
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+ struct CurrentRule {
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+ Vector<Selector> selectors;
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+ Vector<StyleDeclaration> declarations;
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+ };
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+
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+ CurrentRule current_rule;
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+ Vector<char> buffer;
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+
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+ int index = 0;
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+
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+ auto peek = [&]() -> char {
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+ if (index + 1 < css.length())
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+ return css[index + 1];
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+ return 0;
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+ };
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+
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+ auto consume_specific = [&](char ch) {
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+ ASSERT(peek() == ch);
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+ ++index;
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+ return ch;
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+ };
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+
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+ auto consume_one = [&]() -> char {
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+ return css[index++];
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+ };
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+
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+ auto consume_whitespace = [&] {
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+ while (isspace(peek()))
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+ ++index;
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+ };
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+
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+ auto is_valid_selector_char = [](char ch) {
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+ return isalnum(ch) || ch == '-' || ch == '_';
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+ };
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+
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+ auto parse_selector = [&] {
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+ consume_whitespace();
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+ Selector::Component::Type type;
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+ if (peek() == '.')
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+ type = Selector::Component::Type::Class;
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+ else if (peek() == '#')
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+ type = Selector::Component::Type::Id;
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+ else
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+ type = Selector::Component::Type::TagName;
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+
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+ while (is_valid_selector_char(peek()))
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+ buffer.append(consume_one());
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+
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+ Vector<Selector::Component> components;
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+ components.append({ type, String::copy(buffer) });
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+ buffer.clear();
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+ current_rule.selectors.append(Selector(move(components)));
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+ };
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+
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+ auto parse_selector_list = [&] {
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+ for (;;) {
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+ parse_selector();
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+ if (peek() == ',')
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+ continue;
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+ if (peek() == '{')
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+ break;
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+ }
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+ };
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+
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+ auto parse_declaration = [&] {
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+ consume_whitespace();
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+
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+ };
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+
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+ auto parse_declarations = [&] {
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+ for (;;) {
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+ parse_declaration();
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+ if (peek() == '}')
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+ break;
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+ }
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+ };
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+
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+ auto parse_rule = [&] {
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+ parse_selector_list();
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+ consume_specific('{');
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+ parse_declarations();
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+ consume_specific('}');
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+ };
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+
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+ while (index < css.length()) {
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+ parse_rule();
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+ }
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+
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return StyleSheet::create(move(rules));
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}
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