mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-11-04 07:10:57 +00:00
d6cfd56ae6
Also removed the error reporting from parse_a_n_plus_b_pattern() as its caller already reports that error.
1367 lines
59 KiB
C++
1367 lines
59 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2020-2021, the SerenityOS developers.
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* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/Parser/ErrorReporter.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/Infra/Strings.h>
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namespace Web::CSS::Parser {
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Optional<SelectorList> Parser::parse_as_selector(SelectorParsingMode parsing_mode)
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{
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auto selector_list = parse_a_selector_list(m_token_stream, SelectorType::Standalone, parsing_mode);
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if (!selector_list.is_error())
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return selector_list.release_value();
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return {};
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}
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Optional<SelectorList> Parser::parse_as_relative_selector(SelectorParsingMode parsing_mode)
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{
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auto selector_list = parse_a_selector_list(m_token_stream, SelectorType::Relative, parsing_mode);
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if (!selector_list.is_error())
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return selector_list.release_value();
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return {};
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}
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Optional<Selector::PseudoElementSelector> Parser::parse_as_pseudo_element_selector()
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{
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// FIXME: This is quite janky. Selector parsing is not at all designed to allow parsing just a single part of a selector.
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// So, this code parses a whole selector, then rejects it if it's not a single pseudo-element simple selector.
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// Come back and fix this, future Sam!
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auto maybe_selector_list = parse_a_selector_list(m_token_stream, SelectorType::Standalone, SelectorParsingMode::Standard);
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if (maybe_selector_list.is_error())
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return {};
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auto& selector_list = maybe_selector_list.value();
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if (selector_list.size() != 1)
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return {};
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auto& selector = selector_list.first();
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if (selector->compound_selectors().size() != 1)
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return {};
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auto& first_compound_selector = selector->compound_selectors().first();
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if (first_compound_selector.simple_selectors.size() != 1)
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return {};
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auto& simple_selector = first_compound_selector.simple_selectors.first();
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if (simple_selector.type != Selector::SimpleSelector::Type::PseudoElement)
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return {};
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return simple_selector.pseudo_element();
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}
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static NonnullRefPtr<Selector> create_invalid_selector(Selector::Combinator combinator, Vector<ComponentValue> component_values)
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{
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// Trim leading and trailing whitespace
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while (!component_values.is_empty() && component_values.first().is(Token::Type::Whitespace)) {
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component_values.take_first();
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}
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while (!component_values.is_empty() && component_values.last().is(Token::Type::Whitespace)) {
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component_values.take_last();
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}
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Selector::SimpleSelector simple {
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.type = Selector::SimpleSelector::Type::Invalid,
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.value = Selector::SimpleSelector::Invalid {
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.component_values = move(component_values),
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}
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};
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Selector::CompoundSelector compound {
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.combinator = combinator,
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.simple_selectors = { move(simple) }
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};
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return Selector::create({ move(compound) });
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}
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template<typename T>
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Parser::ParseErrorOr<SelectorList> Parser::parse_a_selector_list(TokenStream<T>& tokens, SelectorType mode, SelectorParsingMode parsing_mode)
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{
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SelectorList selectors;
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for (;;) {
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auto selector_parts = consume_a_list_of_component_values(tokens, Token::Type::Comma);
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auto stream = TokenStream(selector_parts);
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auto selector = parse_complex_selector(stream, mode);
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if (selector.is_error()) {
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if (parsing_mode == SelectorParsingMode::Forgiving) {
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// Keep the invalid selector around for serialization and nesting
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auto combinator = mode == SelectorType::Standalone ? Selector::Combinator::None : Selector::Combinator::Descendant;
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selectors.append(create_invalid_selector(combinator, move(selector_parts)));
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} else {
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return selector.error();
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}
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} else {
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selectors.append(selector.release_value());
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}
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if (tokens.is_empty())
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break;
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tokens.discard_a_token();
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}
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if (selectors.is_empty() && parsing_mode != SelectorParsingMode::Forgiving)
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return ParseError::SyntaxError;
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return selectors;
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}
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template Parser::ParseErrorOr<SelectorList> Parser::parse_a_selector_list(TokenStream<ComponentValue>&, SelectorType, SelectorParsingMode);
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template Parser::ParseErrorOr<SelectorList> Parser::parse_a_selector_list(TokenStream<Token>&, SelectorType, SelectorParsingMode);
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Parser::ParseErrorOr<NonnullRefPtr<Selector>> Parser::parse_complex_selector(TokenStream<ComponentValue>& tokens, SelectorType mode)
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{
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Vector<Selector::CompoundSelector> compound_selectors;
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auto first_selector = TRY(parse_compound_selector(tokens));
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if (!first_selector.has_value())
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return ParseError::SyntaxError;
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if (mode == SelectorType::Standalone) {
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if (first_selector->combinator != Selector::Combinator::Descendant)
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return ParseError::SyntaxError;
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first_selector->combinator = Selector::Combinator::None;
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}
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compound_selectors.append(first_selector.release_value());
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while (tokens.has_next_token()) {
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auto compound_selector = TRY(parse_compound_selector(tokens));
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if (!compound_selector.has_value())
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break;
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compound_selectors.append(compound_selector.release_value());
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}
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if (compound_selectors.is_empty())
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return ParseError::SyntaxError;
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return Selector::create(move(compound_selectors));
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}
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Parser::ParseErrorOr<Optional<Selector::CompoundSelector>> Parser::parse_compound_selector(TokenStream<ComponentValue>& tokens)
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{
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tokens.discard_whitespace();
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auto combinator = parse_selector_combinator(tokens).value_or(Selector::Combinator::Descendant);
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tokens.discard_whitespace();
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Vector<Selector::SimpleSelector> simple_selectors;
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while (tokens.has_next_token()) {
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auto component = TRY(parse_simple_selector(tokens));
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if (!component.has_value())
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break;
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if (component->type == Selector::SimpleSelector::Type::TagName && !simple_selectors.is_empty()) {
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// Tag-name selectors can only go at the beginning of a compound selector.
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return ParseError::SyntaxError;
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}
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simple_selectors.append(component.release_value());
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}
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if (simple_selectors.is_empty()) {
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if (tokens.has_next_token() || combinator != Selector::Combinator::Descendant)
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return ParseError::SyntaxError;
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return Optional<Selector::CompoundSelector> {};
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}
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return Selector::CompoundSelector { combinator, move(simple_selectors) };
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}
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Optional<Selector::Combinator> Parser::parse_selector_combinator(TokenStream<ComponentValue>& tokens)
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{
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auto const& current_value = tokens.consume_a_token();
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if (current_value.is(Token::Type::Delim)) {
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switch (current_value.token().delim()) {
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case '>':
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return Selector::Combinator::ImmediateChild;
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case '+':
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return Selector::Combinator::NextSibling;
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case '~':
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return Selector::Combinator::SubsequentSibling;
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case '|': {
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auto const& next = tokens.next_token();
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if (next.is(Token::Type::EndOfFile))
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return {};
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if (next.is_delim('|')) {
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tokens.discard_a_token();
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return Selector::Combinator::Column;
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}
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}
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}
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}
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tokens.reconsume_current_input_token();
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return {};
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}
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Optional<Selector::SimpleSelector::QualifiedName> Parser::parse_selector_qualified_name(TokenStream<ComponentValue>& tokens, AllowWildcardName allow_wildcard_name)
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{
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auto is_name = [](ComponentValue const& token) {
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return token.is_delim('*') || token.is(Token::Type::Ident);
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};
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auto get_name = [](ComponentValue const& token) {
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if (token.is_delim('*'))
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return "*"_fly_string;
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return token.token().ident();
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};
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// There are 3 possibilities here:
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// (Where <name> and <namespace> are either an <ident> or a `*` delim)
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// 1) `|<name>`
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// 2) `<namespace>|<name>`
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// 3) `<name>`
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// Whitespace is forbidden between any of these parts. https://www.w3.org/TR/selectors-4/#white-space
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auto transaction = tokens.begin_transaction();
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auto const& first_token = tokens.consume_a_token();
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if (first_token.is_delim('|')) {
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// Case 1: `|<name>`
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if (is_name(tokens.next_token())) {
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auto const& name_token = tokens.consume_a_token();
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if (allow_wildcard_name == AllowWildcardName::No && name_token.is_delim('*'))
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return {};
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transaction.commit();
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return Selector::SimpleSelector::QualifiedName {
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.namespace_type = Selector::SimpleSelector::QualifiedName::NamespaceType::None,
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.name = get_name(name_token),
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};
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}
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return {};
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}
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if (!is_name(first_token))
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return {};
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if (tokens.next_token().is_delim('|') && is_name(tokens.peek_token(1))) {
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// Case 2: `<namespace>|<name>`
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tokens.discard_a_token(); // `|`
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auto namespace_ = get_name(first_token);
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auto name = get_name(tokens.consume_a_token());
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if (allow_wildcard_name == AllowWildcardName::No && name == "*"sv)
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return {};
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auto namespace_type = namespace_ == "*"sv
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? Selector::SimpleSelector::QualifiedName::NamespaceType::Any
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: Selector::SimpleSelector::QualifiedName::NamespaceType::Named;
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// https://www.w3.org/TR/selectors-4/#invalid
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// a simple selector containing an undeclared namespace prefix is invalid
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if (namespace_type == Selector::SimpleSelector::QualifiedName::NamespaceType::Named && !m_declared_namespaces.contains(namespace_))
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return {};
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transaction.commit();
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return Selector::SimpleSelector::QualifiedName {
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.namespace_type = namespace_type,
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.namespace_ = namespace_,
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.name = name,
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};
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}
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// Case 3: `<name>`
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auto& name_token = first_token;
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if (allow_wildcard_name == AllowWildcardName::No && name_token.is_delim('*'))
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return {};
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transaction.commit();
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return Selector::SimpleSelector::QualifiedName {
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.namespace_type = Selector::SimpleSelector::QualifiedName::NamespaceType::Default,
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.name = get_name(name_token),
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};
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}
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Parser::ParseErrorOr<Selector::SimpleSelector> Parser::parse_attribute_simple_selector(ComponentValue const& first_value)
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{
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auto attribute_tokens = TokenStream { first_value.block().value };
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attribute_tokens.discard_whitespace();
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if (!attribute_tokens.has_next_token()) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = "Attribute selector is empty."_string,
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});
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return ParseError::SyntaxError;
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}
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auto maybe_qualified_name = parse_selector_qualified_name(attribute_tokens, AllowWildcardName::No);
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if (!maybe_qualified_name.has_value()) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected qualified-name, got: '{}'.", attribute_tokens.next_token().to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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auto qualified_name = maybe_qualified_name.release_value();
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Selector::SimpleSelector simple_selector {
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.type = Selector::SimpleSelector::Type::Attribute,
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.value = Selector::SimpleSelector::Attribute {
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.match_type = Selector::SimpleSelector::Attribute::MatchType::HasAttribute,
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.qualified_name = qualified_name,
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.case_type = Selector::SimpleSelector::Attribute::CaseType::DefaultMatch,
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}
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};
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attribute_tokens.discard_whitespace();
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if (!attribute_tokens.has_next_token())
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return simple_selector;
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auto const& delim_part = attribute_tokens.consume_a_token();
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if (!delim_part.is(Token::Type::Delim)) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected delim for attribute comparison, got: '{}'.", delim_part.to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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if (delim_part.token().delim() == '=') {
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::ExactValueMatch;
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} else {
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if (!attribute_tokens.has_next_token()) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = "Attribute selector ended part way through a match type."_string,
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});
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return ParseError::SyntaxError;
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}
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auto const& delim_second_part = attribute_tokens.consume_a_token();
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if (!delim_second_part.is_delim('=')) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected a double delim for attribute comparison, got: '{}{}'.", delim_part.to_debug_string(), delim_second_part.to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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switch (delim_part.token().delim()) {
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case '~':
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::ContainsWord;
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break;
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case '*':
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::ContainsString;
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break;
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case '|':
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::StartsWithSegment;
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break;
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case '^':
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::StartsWithString;
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break;
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case '$':
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simple_selector.attribute().match_type = Selector::SimpleSelector::Attribute::MatchType::EndsWithString;
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break;
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default:
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attribute_tokens.reconsume_current_input_token();
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}
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}
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attribute_tokens.discard_whitespace();
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if (!attribute_tokens.has_next_token()) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = "Attribute selector ended without a value to match."_string,
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});
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return ParseError::SyntaxError;
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}
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auto const& value_part = attribute_tokens.consume_a_token();
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if (!value_part.is(Token::Type::Ident) && !value_part.is(Token::Type::String)) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected a string or ident for the value to match attribute against, got: '{}'.", value_part.to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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auto const& value_string = value_part.token().is(Token::Type::Ident) ? value_part.token().ident() : value_part.token().string();
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simple_selector.attribute().value = value_string.to_string();
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attribute_tokens.discard_whitespace();
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// Handle case-sensitivity suffixes. https://www.w3.org/TR/selectors-4/#attribute-case
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if (attribute_tokens.has_next_token()) {
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auto const& case_sensitivity_part = attribute_tokens.consume_a_token();
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if (case_sensitivity_part.is(Token::Type::Ident)) {
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auto case_sensitivity = case_sensitivity_part.token().ident();
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if (case_sensitivity.equals_ignoring_ascii_case("i"sv)) {
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simple_selector.attribute().case_type = Selector::SimpleSelector::Attribute::CaseType::CaseInsensitiveMatch;
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} else if (case_sensitivity.equals_ignoring_ascii_case("s"sv)) {
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simple_selector.attribute().case_type = Selector::SimpleSelector::Attribute::CaseType::CaseSensitiveMatch;
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} else {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected a \"i\" or \"s\" attribute selector case sensitivity identifier, got: '{}'.", case_sensitivity_part.to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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} else {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = MUST(String::formatted("Expected an attribute selector case sensitivity identifier, got: '{}'", case_sensitivity_part.to_debug_string())),
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});
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return ParseError::SyntaxError;
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}
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}
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attribute_tokens.discard_whitespace();
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if (attribute_tokens.has_next_token()) {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = first_value.to_string(),
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.description = "Trailing tokens in attribute selector."_string,
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});
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return ParseError::SyntaxError;
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}
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return simple_selector;
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}
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Parser::ParseErrorOr<Selector::SimpleSelector> Parser::parse_pseudo_simple_selector(TokenStream<ComponentValue>& tokens)
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{
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auto peek_token_ends_selector = [&]() -> bool {
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auto const& value = tokens.next_token();
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return (value.is(Token::Type::EndOfFile) || value.is(Token::Type::Whitespace) || value.is(Token::Type::Comma));
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};
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if (peek_token_ends_selector())
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return ParseError::SyntaxError;
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// Note that we already consumed one colon before we entered this function.
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// FIXME: Don't do that.
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bool is_pseudo_element = false;
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if (tokens.next_token().is(Token::Type::Colon)) {
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is_pseudo_element = true;
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tokens.discard_a_token();
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if (peek_token_ends_selector())
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return ParseError::SyntaxError;
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}
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if (is_pseudo_element) {
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auto const& name_token = tokens.consume_a_token();
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bool is_function = false;
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FlyString pseudo_name;
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if (name_token.is(Token::Type::Ident)) {
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pseudo_name = name_token.token().ident();
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} else if (name_token.is_function()) {
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pseudo_name = name_token.function().name;
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is_function = true;
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} else {
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ErrorReporter::the().report(InvalidSelectorError {
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.value_string = name_token.to_string(),
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.description = MUST(String::formatted("Pseudo-element should be an ident or function, got: '{}'", name_token.to_debug_string())),
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});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
bool is_aliased_pseudo = false;
|
||
auto pseudo_element = pseudo_element_from_string(pseudo_name);
|
||
if (!pseudo_element.has_value()) {
|
||
pseudo_element = aliased_pseudo_element_from_string(pseudo_name);
|
||
is_aliased_pseudo = pseudo_element.has_value();
|
||
}
|
||
|
||
if (pseudo_element.has_value()) {
|
||
auto metadata = pseudo_element_metadata(*pseudo_element);
|
||
|
||
// :has() is fussy about pseudo-elements inside it
|
||
if (m_pseudo_class_context.contains_slow(PseudoClass::Has) && !is_has_allowed_pseudo_element(*pseudo_element)) {
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
Selector::PseudoElementSelector::Value value = Empty {};
|
||
if (is_function) {
|
||
if (!metadata.is_valid_as_function) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = "Not valid as a function."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
// Parse arguments
|
||
TokenStream function_tokens { name_token.function().value };
|
||
function_tokens.discard_whitespace();
|
||
|
||
switch (metadata.parameter_type) {
|
||
case PseudoElementMetadata::ParameterType::None:
|
||
if (function_tokens.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = "Should have no arguments."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
break;
|
||
case PseudoElementMetadata::ParameterType::CompoundSelector: {
|
||
auto compound_selector_or_error = parse_compound_selector(function_tokens);
|
||
if (compound_selector_or_error.is_error() || !compound_selector_or_error.value().has_value()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = "Failed to parse argument as a compound selector."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
auto compound_selector = compound_selector_or_error.release_value().release_value();
|
||
compound_selector.combinator = Selector::Combinator::None;
|
||
|
||
Vector compound_selectors { move(compound_selector) };
|
||
value = Selector::create(move(compound_selectors));
|
||
break;
|
||
}
|
||
case PseudoElementMetadata::ParameterType::PTNameSelector: {
|
||
// <pt-name-selector> = '*' | <custom-ident>
|
||
// https://drafts.csswg.org/css-view-transitions-1/#typedef-pt-name-selector
|
||
if (function_tokens.next_token().is_delim('*')) {
|
||
function_tokens.discard_a_token(); // *
|
||
value = Selector::PseudoElementSelector::PTNameSelector { .is_universal = true };
|
||
} else if (auto custom_ident = parse_custom_ident(function_tokens, {}); custom_ident.has_value()) {
|
||
value = Selector::PseudoElementSelector::PTNameSelector { .value = custom_ident.release_value() };
|
||
} else {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = MUST(String::formatted("Invalid <pt-name-selector> - expected `*` or `<custom-ident>`, got `{}`", function_tokens.next_token().to_debug_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
function_tokens.discard_whitespace();
|
||
if (function_tokens.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = "Invalid <pt-name-selector> - trailing tokens."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
} else {
|
||
if (!metadata.is_valid_as_identifier) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
.value_string = name_token.to_string(),
|
||
.description = "Only valid as a function."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
}
|
||
|
||
// Aliased pseudo-elements behave like their target pseudo-element, but serialize as themselves. So store their
|
||
// name like we do for unknown -webkit pseudos below.
|
||
if (is_aliased_pseudo) {
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoElement,
|
||
.value = Selector::PseudoElementSelector { pseudo_element.release_value(), pseudo_name.to_string().to_ascii_lowercase(), move(value) }
|
||
};
|
||
}
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoElement,
|
||
.value = Selector::PseudoElementSelector { pseudo_element.release_value(), move(value) }
|
||
};
|
||
}
|
||
|
||
// https://www.w3.org/TR/selectors-4/#compat
|
||
// All other pseudo-elements whose names begin with the string “-webkit-” (matched ASCII case-insensitively)
|
||
// and that are not functional notations must be treated as valid at parse time. (That is, ::-webkit-asdf is
|
||
// valid at parse time, but ::-webkit-jkl() is not.) If they’re not otherwise recognized and supported, they
|
||
// must be treated as matching nothing, and are unknown -webkit- pseudo-elements.
|
||
if (!is_function && pseudo_name.starts_with_bytes("-webkit-"sv, CaseSensitivity::CaseInsensitive)) {
|
||
// :has() only allows a limited set of pseudo-elements inside it, which doesn't include unknown ones.
|
||
if (m_pseudo_class_context.contains_slow(PseudoClass::Has))
|
||
return ParseError::SyntaxError;
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoElement,
|
||
// Unknown -webkit- pseudo-elements must be serialized in ASCII lowercase.
|
||
.value = Selector::PseudoElementSelector { PseudoElement::UnknownWebKit, pseudo_name.to_string().to_ascii_lowercase() },
|
||
};
|
||
}
|
||
|
||
if (has_ignored_vendor_prefix(pseudo_name))
|
||
return ParseError::IncludesIgnoredVendorPrefix;
|
||
|
||
ErrorReporter::the().report(UnknownPseudoClassOrElementError {
|
||
.name = MUST(String::formatted("::{}", pseudo_name)),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
if (peek_token_ends_selector())
|
||
return ParseError::SyntaxError;
|
||
|
||
auto const& pseudo_class_token = tokens.consume_a_token();
|
||
|
||
if (pseudo_class_token.is(Token::Type::Ident)) {
|
||
auto pseudo_name = pseudo_class_token.token().ident();
|
||
if (has_ignored_vendor_prefix(pseudo_name))
|
||
return ParseError::IncludesIgnoredVendorPrefix;
|
||
|
||
auto make_pseudo_class_selector = [](auto pseudo_class) {
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector { .type = pseudo_class }
|
||
};
|
||
};
|
||
|
||
if (auto pseudo_class = pseudo_class_from_string(pseudo_name); pseudo_class.has_value()) {
|
||
if (!pseudo_class_metadata(pseudo_class.value()).is_valid_as_identifier) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Only valid as a function."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
return make_pseudo_class_selector(pseudo_class.value());
|
||
}
|
||
|
||
// Single-colon syntax allowed for ::after, ::before, ::first-letter and ::first-line for compatibility.
|
||
// https://www.w3.org/TR/selectors/#pseudo-element-syntax
|
||
if (auto pseudo_element = pseudo_element_from_string(pseudo_name); pseudo_element.has_value()) {
|
||
switch (pseudo_element.value()) {
|
||
case PseudoElement::After:
|
||
case PseudoElement::Before:
|
||
case PseudoElement::FirstLetter:
|
||
case PseudoElement::FirstLine:
|
||
// :has() is fussy about pseudo-elements inside it
|
||
if (m_pseudo_class_context.contains_slow(PseudoClass::Has) && !is_has_allowed_pseudo_element(pseudo_element.value())) {
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoElement,
|
||
.value = Selector::PseudoElementSelector { pseudo_element.value() }
|
||
};
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
ErrorReporter::the().report(UnknownPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_name)),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
if (pseudo_class_token.is_function()) {
|
||
auto parse_nth_child_selector = [this](auto pseudo_class, Vector<ComponentValue> const& function_values, bool allow_of = false) -> ParseErrorOr<Selector::SimpleSelector> {
|
||
auto tokens = TokenStream<ComponentValue>(function_values);
|
||
auto nth_child_pattern = parse_a_n_plus_b_pattern(tokens);
|
||
if (!nth_child_pattern.has_value()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_class_name(pseudo_class))),
|
||
.value_string = tokens.dump_string(),
|
||
.description = "Invalid An+B format."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
tokens.discard_whitespace();
|
||
if (!tokens.has_next_token()) {
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.nth_child_pattern = nth_child_pattern.release_value() }
|
||
};
|
||
}
|
||
|
||
if (!allow_of)
|
||
return ParseError::SyntaxError;
|
||
|
||
// Parse the `of <selector-list>` syntax
|
||
auto const& maybe_of = tokens.consume_a_token();
|
||
if (!maybe_of.is_ident("of"sv))
|
||
return ParseError::SyntaxError;
|
||
|
||
tokens.discard_whitespace();
|
||
auto selector_list = TRY(parse_a_selector_list(tokens, SelectorType::Standalone));
|
||
|
||
tokens.discard_whitespace();
|
||
if (tokens.has_next_token())
|
||
return ParseError::SyntaxError;
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.nth_child_pattern = nth_child_pattern.release_value(),
|
||
.argument_selector_list = move(selector_list) }
|
||
};
|
||
};
|
||
|
||
auto const& pseudo_function = pseudo_class_token.function();
|
||
auto maybe_pseudo_class = pseudo_class_from_string(pseudo_function.name);
|
||
if (!maybe_pseudo_class.has_value()) {
|
||
ErrorReporter::the().report(UnknownPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
auto pseudo_class = maybe_pseudo_class.value();
|
||
auto metadata = pseudo_class_metadata(pseudo_class);
|
||
|
||
if (!metadata.is_valid_as_function) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Not valid as a function."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
if (pseudo_function.value.is_empty()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Missing arguments."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
// "The :has() pseudo-class cannot be nested; :has() is not valid within :has()."
|
||
// https://drafts.csswg.org/selectors/#relational
|
||
if (pseudo_class == PseudoClass::Has && m_pseudo_class_context.contains_slow(PseudoClass::Has)) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = ":has() is not allowed inside :has()."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
m_pseudo_class_context.append(pseudo_class);
|
||
ScopeGuard guard = [&] { m_pseudo_class_context.take_last(); };
|
||
|
||
switch (metadata.parameter_type) {
|
||
case PseudoClassMetadata::ParameterType::ANPlusB:
|
||
return parse_nth_child_selector(pseudo_class, pseudo_function.value, false);
|
||
case PseudoClassMetadata::ParameterType::ANPlusBOf:
|
||
return parse_nth_child_selector(pseudo_class, pseudo_function.value, true);
|
||
case PseudoClassMetadata::ParameterType::CompoundSelector: {
|
||
auto function_token_stream = TokenStream(pseudo_function.value);
|
||
auto compound_selector_or_error = parse_compound_selector(function_token_stream);
|
||
if (compound_selector_or_error.is_error() || !compound_selector_or_error.value().has_value()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Failed to parse argument as a compound selector."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
auto compound_selector = compound_selector_or_error.release_value().release_value();
|
||
compound_selector.combinator = Selector::Combinator::None;
|
||
|
||
Vector compound_selectors { move(compound_selector) };
|
||
auto selector = Selector::create(move(compound_selectors));
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.argument_selector_list = { move(selector) } }
|
||
};
|
||
}
|
||
case PseudoClassMetadata::ParameterType::ForgivingRelativeSelectorList:
|
||
case PseudoClassMetadata::ParameterType::ForgivingSelectorList: {
|
||
auto function_token_stream = TokenStream(pseudo_function.value);
|
||
auto selector_type = metadata.parameter_type == PseudoClassMetadata::ParameterType::ForgivingSelectorList
|
||
? SelectorType::Standalone
|
||
: SelectorType::Relative;
|
||
// NOTE: Because it's forgiving, even complete garbage will parse OK as an empty selector-list.
|
||
auto argument_selector_list = MUST(parse_a_selector_list(function_token_stream, selector_type, SelectorParsingMode::Forgiving));
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.is_forgiving = true,
|
||
.argument_selector_list = move(argument_selector_list) }
|
||
};
|
||
}
|
||
case PseudoClassMetadata::ParameterType::Ident: {
|
||
auto function_token_stream = TokenStream(pseudo_function.value);
|
||
function_token_stream.discard_whitespace();
|
||
auto const& maybe_ident_token = function_token_stream.consume_a_token();
|
||
function_token_stream.discard_whitespace();
|
||
if (!maybe_ident_token.is(Token::Type::Ident) || function_token_stream.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Failed to parse argument as an ident."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
auto& ident = maybe_ident_token.token().ident();
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.ident = Selector::SimpleSelector::PseudoClassSelector::Ident {
|
||
.keyword = keyword_from_string(ident).value_or(Keyword::Invalid),
|
||
.string_value = ident,
|
||
},
|
||
}
|
||
};
|
||
}
|
||
case PseudoClassMetadata::ParameterType::LanguageRanges: {
|
||
Vector<FlyString> languages;
|
||
auto function_token_stream = TokenStream(pseudo_function.value);
|
||
auto language_token_lists = parse_a_comma_separated_list_of_component_values(function_token_stream);
|
||
|
||
for (auto const& language_token_list : language_token_lists) {
|
||
auto language_token_stream = TokenStream(language_token_list);
|
||
language_token_stream.discard_whitespace();
|
||
auto const& language_token = language_token_stream.consume_a_token();
|
||
if (!(language_token.is(Token::Type::Ident) || language_token.is(Token::Type::String))) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Failed to parse argument as a language range: Not a string/ident."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
auto language_string = language_token.is(Token::Type::String) ? language_token.token().string() : language_token.token().ident();
|
||
languages.append(language_string);
|
||
|
||
language_token_stream.discard_whitespace();
|
||
if (language_token_stream.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidPseudoClassOrElementError {
|
||
.name = MUST(String::formatted(":{}", pseudo_function.name)),
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = "Failed to parse argument as a language range: Has trailing tokens."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
}
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.languages = move(languages) }
|
||
};
|
||
}
|
||
case PseudoClassMetadata::ParameterType::RelativeSelectorList:
|
||
case PseudoClassMetadata::ParameterType::SelectorList: {
|
||
auto function_token_stream = TokenStream(pseudo_function.value);
|
||
auto selector_type = metadata.parameter_type == PseudoClassMetadata::ParameterType::SelectorList
|
||
? SelectorType::Standalone
|
||
: SelectorType::Relative;
|
||
auto not_selector = TRY(parse_a_selector_list(function_token_stream, selector_type));
|
||
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::PseudoClass,
|
||
.value = Selector::SimpleSelector::PseudoClassSelector {
|
||
.type = pseudo_class,
|
||
.argument_selector_list = move(not_selector) }
|
||
};
|
||
}
|
||
case PseudoClassMetadata::ParameterType::None:
|
||
// `None` means this is not a function-type pseudo-class, so this state should be impossible.
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
}
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.value_string = pseudo_class_token.to_string(),
|
||
.description = MUST(String::formatted("Pseudo-class should be an ident or function, got: '{}'", pseudo_class_token.to_debug_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
Parser::ParseErrorOr<Optional<Selector::SimpleSelector>> Parser::parse_simple_selector(TokenStream<ComponentValue>& tokens)
|
||
{
|
||
auto peek_token_ends_selector = [&]() -> bool {
|
||
auto const& value = tokens.next_token();
|
||
return (value.is(Token::Type::EndOfFile) || value.is(Token::Type::Whitespace) || value.is(Token::Type::Comma));
|
||
};
|
||
|
||
if (peek_token_ends_selector())
|
||
return Optional<Selector::SimpleSelector> {};
|
||
|
||
// Handle universal and tag-name types together, since both can be namespaced
|
||
if (auto qualified_name = parse_selector_qualified_name(tokens, AllowWildcardName::Yes); qualified_name.has_value()) {
|
||
if (qualified_name->name.name == "*"sv) {
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::Universal,
|
||
.value = qualified_name.release_value(),
|
||
};
|
||
}
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::TagName,
|
||
.value = qualified_name.release_value(),
|
||
};
|
||
}
|
||
|
||
auto const& first_value = tokens.consume_a_token();
|
||
|
||
if (first_value.is(Token::Type::Delim)) {
|
||
u32 delim = first_value.token().delim();
|
||
switch (delim) {
|
||
case '*':
|
||
// Handled already
|
||
VERIFY_NOT_REACHED();
|
||
case '&':
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::Nesting,
|
||
};
|
||
case '.': {
|
||
if (peek_token_ends_selector())
|
||
return ParseError::SyntaxError;
|
||
|
||
auto const& class_name_value = tokens.consume_a_token();
|
||
if (!class_name_value.is(Token::Type::Ident)) {
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.value_string = tokens.dump_string(),
|
||
.description = MUST(String::formatted("Expected an ident after '.', got: {}", class_name_value.to_debug_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::Class,
|
||
.value = Selector::SimpleSelector::Name { class_name_value.token().ident() }
|
||
};
|
||
}
|
||
case '>':
|
||
case '+':
|
||
case '~':
|
||
case '|':
|
||
// Whitespace is not required between the compound-selector and a combinator.
|
||
// So, if we see a combinator, return that this compound-selector is done, instead of a syntax error.
|
||
tokens.reconsume_current_input_token();
|
||
return Optional<Selector::SimpleSelector> {};
|
||
default:
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.value_string = tokens.dump_string(),
|
||
.description = MUST(String::formatted("Unrecognized delimiter: {}", first_value.token().to_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
}
|
||
|
||
if (first_value.is(Token::Type::Hash)) {
|
||
if (first_value.token().hash_type() != Token::HashType::Id) {
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.value_string = tokens.dump_string(),
|
||
.description = MUST(String::formatted("Hash token is not an id: {}", first_value.to_debug_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
return Selector::SimpleSelector {
|
||
.type = Selector::SimpleSelector::Type::Id,
|
||
.value = Selector::SimpleSelector::Name { first_value.token().hash_value() }
|
||
};
|
||
}
|
||
|
||
if (first_value.is_block() && first_value.block().is_square())
|
||
return TRY(parse_attribute_simple_selector(first_value));
|
||
|
||
if (first_value.is(Token::Type::Colon))
|
||
return TRY(parse_pseudo_simple_selector(tokens));
|
||
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.value_string = tokens.dump_string(),
|
||
.description = MUST(String::formatted("Invalid start of a simple selector: {}", first_value.to_debug_string())),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
Optional<Selector::SimpleSelector::ANPlusBPattern> Parser::parse_a_n_plus_b_pattern(TokenStream<ComponentValue>& values)
|
||
{
|
||
auto transaction = values.begin_transaction();
|
||
|
||
auto is_sign = [](ComponentValue const& value) -> bool {
|
||
return value.is(Token::Type::Delim) && (value.token().delim() == '+' || value.token().delim() == '-');
|
||
};
|
||
auto is_n_dimension = [](ComponentValue const& value) -> bool {
|
||
if (!value.is(Token::Type::Dimension))
|
||
return false;
|
||
if (!value.token().number().is_integer())
|
||
return false;
|
||
if (!value.token().dimension_unit().equals_ignoring_ascii_case("n"sv))
|
||
return false;
|
||
return true;
|
||
};
|
||
auto is_ndash_dimension = [](ComponentValue const& value) -> bool {
|
||
if (!value.is(Token::Type::Dimension))
|
||
return false;
|
||
if (!value.token().number().is_integer())
|
||
return false;
|
||
if (!value.token().dimension_unit().equals_ignoring_ascii_case("n-"sv))
|
||
return false;
|
||
return true;
|
||
};
|
||
auto is_ndashdigit_dimension = [](ComponentValue const& value) -> bool {
|
||
if (!value.is(Token::Type::Dimension))
|
||
return false;
|
||
if (!value.token().number().is_integer())
|
||
return false;
|
||
auto dimension_unit = value.token().dimension_unit();
|
||
if (!dimension_unit.starts_with_bytes("n-"sv, CaseSensitivity::CaseInsensitive))
|
||
return false;
|
||
for (size_t i = 2; i < dimension_unit.bytes_as_string_view().length(); ++i) {
|
||
if (!is_ascii_digit(dimension_unit.bytes_as_string_view()[i]))
|
||
return false;
|
||
}
|
||
return true;
|
||
};
|
||
auto is_ndashdigit_ident = [](ComponentValue const& value) -> bool {
|
||
if (!value.is(Token::Type::Ident))
|
||
return false;
|
||
auto ident = value.token().ident();
|
||
if (!ident.starts_with_bytes("n-"sv, CaseSensitivity::CaseInsensitive))
|
||
return false;
|
||
for (size_t i = 2; i < ident.bytes_as_string_view().length(); ++i) {
|
||
if (!is_ascii_digit(ident.bytes_as_string_view()[i]))
|
||
return false;
|
||
}
|
||
return true;
|
||
};
|
||
auto is_dashndashdigit_ident = [](ComponentValue const& value) -> bool {
|
||
if (!value.is(Token::Type::Ident))
|
||
return false;
|
||
auto ident = value.token().ident();
|
||
if (!ident.starts_with_bytes("-n-"sv, CaseSensitivity::CaseInsensitive))
|
||
return false;
|
||
if (ident.bytes_as_string_view().length() == 3)
|
||
return false;
|
||
for (size_t i = 3; i < ident.bytes_as_string_view().length(); ++i) {
|
||
if (!is_ascii_digit(ident.bytes_as_string_view()[i]))
|
||
return false;
|
||
}
|
||
return true;
|
||
};
|
||
auto is_integer = [](ComponentValue const& value) -> bool {
|
||
return value.is(Token::Type::Number) && value.token().number().is_integer();
|
||
};
|
||
auto is_signed_integer = [](ComponentValue const& value) -> bool {
|
||
return value.is(Token::Type::Number) && value.token().number().is_integer_with_explicit_sign();
|
||
};
|
||
auto is_signless_integer = [](ComponentValue const& value) -> bool {
|
||
return value.is(Token::Type::Number) && !value.token().number().is_integer_with_explicit_sign();
|
||
};
|
||
|
||
// https://www.w3.org/TR/css-syntax-3/#the-anb-type
|
||
// Unfortunately these can't be in the same order as in the spec.
|
||
|
||
values.discard_whitespace();
|
||
auto const& first_value = values.consume_a_token();
|
||
|
||
// odd | even
|
||
if (first_value.is(Token::Type::Ident)) {
|
||
auto ident = first_value.token().ident();
|
||
if (ident.equals_ignoring_ascii_case("odd"sv)) {
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 2, 1 };
|
||
}
|
||
if (ident.equals_ignoring_ascii_case("even"sv)) {
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 2, 0 };
|
||
}
|
||
}
|
||
// <integer>
|
||
if (is_integer(first_value)) {
|
||
int b = first_value.token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 0, b };
|
||
}
|
||
// <n-dimension>
|
||
// <n-dimension> <signed-integer>
|
||
// <n-dimension> ['+' | '-'] <signless-integer>
|
||
if (is_n_dimension(first_value)) {
|
||
int a = first_value.token().dimension_value_int();
|
||
values.discard_whitespace();
|
||
|
||
// <n-dimension> <signed-integer>
|
||
if (is_signed_integer(values.next_token())) {
|
||
int b = values.consume_a_token().token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { a, b };
|
||
}
|
||
|
||
// <n-dimension> ['+' | '-'] <signless-integer>
|
||
{
|
||
auto child_transaction = transaction.create_child();
|
||
auto const& second_value = values.consume_a_token();
|
||
values.discard_whitespace();
|
||
auto const& third_value = values.consume_a_token();
|
||
|
||
if (is_sign(second_value) && is_signless_integer(third_value)) {
|
||
int b = third_value.token().to_integer() * (second_value.is_delim('+') ? 1 : -1);
|
||
child_transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { a, b };
|
||
}
|
||
}
|
||
|
||
// <n-dimension>
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { a, 0 };
|
||
}
|
||
// <ndash-dimension> <signless-integer>
|
||
if (is_ndash_dimension(first_value)) {
|
||
values.discard_whitespace();
|
||
auto const& second_value = values.consume_a_token();
|
||
if (is_signless_integer(second_value)) {
|
||
int a = first_value.token().dimension_value_int();
|
||
int b = -second_value.token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { a, b };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
// <ndashdigit-dimension>
|
||
if (is_ndashdigit_dimension(first_value)) {
|
||
auto const& dimension = first_value.token();
|
||
int a = dimension.dimension_value_int();
|
||
auto maybe_b = dimension.dimension_unit().bytes_as_string_view().substring_view(1).to_number<int>();
|
||
if (maybe_b.has_value()) {
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { a, maybe_b.value() };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
// <dashndashdigit-ident>
|
||
if (is_dashndashdigit_ident(first_value)) {
|
||
auto maybe_b = first_value.token().ident().bytes_as_string_view().substring_view(2).to_number<int>();
|
||
if (maybe_b.has_value()) {
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { -1, maybe_b.value() };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
// -n
|
||
// -n <signed-integer>
|
||
// -n ['+' | '-'] <signless-integer>
|
||
if (first_value.is_ident("-n"sv)) {
|
||
values.discard_whitespace();
|
||
|
||
// -n <signed-integer>
|
||
if (is_signed_integer(values.next_token())) {
|
||
int b = values.consume_a_token().token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { -1, b };
|
||
}
|
||
|
||
// -n ['+' | '-'] <signless-integer>
|
||
{
|
||
auto child_transaction = transaction.create_child();
|
||
auto const& second_value = values.consume_a_token();
|
||
values.discard_whitespace();
|
||
auto const& third_value = values.consume_a_token();
|
||
|
||
if (is_sign(second_value) && is_signless_integer(third_value)) {
|
||
int b = third_value.token().to_integer() * (second_value.is_delim('+') ? 1 : -1);
|
||
child_transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { -1, b };
|
||
}
|
||
}
|
||
|
||
// -n
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { -1, 0 };
|
||
}
|
||
// -n- <signless-integer>
|
||
if (first_value.is_ident("-n-"sv)) {
|
||
values.discard_whitespace();
|
||
auto const& second_value = values.consume_a_token();
|
||
if (is_signless_integer(second_value)) {
|
||
int b = -second_value.token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { -1, b };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
// All that's left now are these:
|
||
// '+'?† n
|
||
// '+'?† n <signed-integer>
|
||
// '+'?† n ['+' | '-'] <signless-integer>
|
||
// '+'?† n- <signless-integer>
|
||
// '+'?† <ndashdigit-ident>
|
||
// In all of these cases, the + is optional, and has no effect.
|
||
// So, we just skip the +, and carry on.
|
||
if (!first_value.is_delim('+')) {
|
||
values.reconsume_current_input_token();
|
||
// We do *not* skip whitespace here.
|
||
}
|
||
|
||
auto const& first_after_plus = values.consume_a_token();
|
||
// '+'?† n
|
||
// '+'?† n <signed-integer>
|
||
// '+'?† n ['+' | '-'] <signless-integer>
|
||
if (first_after_plus.is_ident("n"sv)) {
|
||
values.discard_whitespace();
|
||
|
||
// '+'?† n <signed-integer>
|
||
if (is_signed_integer(values.next_token())) {
|
||
int b = values.consume_a_token().token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 1, b };
|
||
}
|
||
|
||
// '+'?† n ['+' | '-'] <signless-integer>
|
||
{
|
||
auto child_transaction = transaction.create_child();
|
||
auto const& second_value = values.consume_a_token();
|
||
values.discard_whitespace();
|
||
auto const& third_value = values.consume_a_token();
|
||
|
||
if (is_sign(second_value) && is_signless_integer(third_value)) {
|
||
int b = third_value.token().to_integer() * (second_value.is_delim('+') ? 1 : -1);
|
||
child_transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 1, b };
|
||
}
|
||
}
|
||
|
||
// '+'?† n
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 1, 0 };
|
||
}
|
||
|
||
// '+'?† n- <signless-integer>
|
||
if (first_after_plus.is_ident("n-"sv)) {
|
||
values.discard_whitespace();
|
||
auto const& second_value = values.consume_a_token();
|
||
if (is_signless_integer(second_value)) {
|
||
int b = -second_value.token().to_integer();
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 1, b };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
// '+'?† <ndashdigit-ident>
|
||
if (is_ndashdigit_ident(first_after_plus)) {
|
||
auto maybe_b = first_after_plus.token().ident().bytes_as_string_view().substring_view(1).to_number<int>();
|
||
if (maybe_b.has_value()) {
|
||
transaction.commit();
|
||
return Selector::SimpleSelector::ANPlusBPattern { 1, maybe_b.value() };
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
Optional<PageSelectorList> Parser::parse_as_page_selector_list()
|
||
{
|
||
auto selector_list = parse_a_page_selector_list(m_token_stream);
|
||
if (!selector_list.is_error())
|
||
return selector_list.release_value();
|
||
return {};
|
||
}
|
||
|
||
template<typename T>
|
||
Parser::ParseErrorOr<PageSelectorList> Parser::parse_a_page_selector_list(TokenStream<T>& tokens)
|
||
{
|
||
// https://drafts.csswg.org/css-page-3/#syntax-page-selector
|
||
// <page-selector-list> = <page-selector>#
|
||
// <page-selector> = [ <ident-token>? <pseudo-page>* ]!
|
||
// <pseudo-page> = : [ left | right | first | blank ]
|
||
|
||
PageSelectorList selector_list;
|
||
|
||
tokens.discard_whitespace();
|
||
|
||
while (tokens.has_next_token()) {
|
||
// First optional ident
|
||
Optional<FlyString> maybe_ident;
|
||
if (tokens.next_token().is(Token::Type::Ident))
|
||
maybe_ident = static_cast<Token>(tokens.consume_a_token()).ident();
|
||
|
||
// Then an optional series of pseudo-classes
|
||
Vector<PagePseudoClass> pseudo_classes;
|
||
while (tokens.next_token().is(Token::Type::Colon)) {
|
||
tokens.discard_a_token(); // :
|
||
if (!tokens.next_token().is(Token::Type::Ident)) {
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.rule_name = "@page"_fly_string,
|
||
.value_string = tokens.dump_string(),
|
||
.description = "Pseudo-classes must be idents."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
auto pseudo_class_name = static_cast<Token>(tokens.consume_a_token()).ident();
|
||
if (auto pseudo_class = page_pseudo_class_from_string(pseudo_class_name); pseudo_class.has_value()) {
|
||
pseudo_classes.append(*pseudo_class);
|
||
} else {
|
||
ErrorReporter::the().report(UnknownPseudoClassOrElementError {
|
||
.rule_name = "@page"_fly_string,
|
||
.name = MUST(String::formatted(":{}", pseudo_class_name)),
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
}
|
||
|
||
if (!maybe_ident.has_value() && pseudo_classes.is_empty()) {
|
||
// Nothing parsed
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.rule_name = "@page"_fly_string,
|
||
.value_string = tokens.dump_string(),
|
||
.description = "Is empty."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
selector_list.empend(move(maybe_ident), move(pseudo_classes));
|
||
|
||
tokens.discard_whitespace();
|
||
|
||
if (tokens.next_token().is(Token::Type::Comma)) {
|
||
tokens.discard_a_token(); // ,
|
||
tokens.discard_whitespace();
|
||
if (!tokens.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.rule_name = "@page"_fly_string,
|
||
.value_string = tokens.dump_string(),
|
||
.description = "Trailing comma."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
|
||
} else if (tokens.has_next_token()) {
|
||
ErrorReporter::the().report(InvalidSelectorError {
|
||
.rule_name = "@page"_fly_string,
|
||
.value_string = tokens.dump_string(),
|
||
.description = "Trailing tokens."_string,
|
||
});
|
||
return ParseError::SyntaxError;
|
||
}
|
||
}
|
||
|
||
return selector_list;
|
||
}
|
||
template Parser::ParseErrorOr<PageSelectorList> Parser::parse_a_page_selector_list(TokenStream<ComponentValue>&);
|
||
template Parser::ParseErrorOr<PageSelectorList> Parser::parse_a_page_selector_list(TokenStream<Token>&);
|
||
|
||
}
|