919eb7c0aa
Previous multi-value properties use a ValueListStyleValue, which then gets parsed into its sub-properties in the StyleResolver. However, that is not ideal, especially as it exposes StyleResolver to the inner workings of the Parser and Tokenizer, which it should not need to know about. The way `box-shadow` was implemented as a StyleValue subclass means that the parsing can happen inside the Parser instead, which seems like a better solution. Converting the other complicated cases (background, font, list-style) is on my todo list for later.
203 lines
8.4 KiB
C++
203 lines
8.4 KiB
C++
/*
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* Copyright (c) 2020-2021, the SerenityOS developers.
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* Copyright (c) 2021, Sam Atkins <atkinssj@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefPtr.h>
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#include <AK/Result.h>
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#include <AK/Vector.h>
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#include <LibWeb/CSS/Parser/DeclarationOrAtRule.h>
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#include <LibWeb/CSS/Parser/StyleBlockRule.h>
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#include <LibWeb/CSS/Parser/StyleComponentValueRule.h>
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#include <LibWeb/CSS/Parser/StyleDeclarationRule.h>
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#include <LibWeb/CSS/Parser/StyleFunctionRule.h>
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#include <LibWeb/CSS/Parser/StyleRule.h>
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#include <LibWeb/CSS/Parser/Tokenizer.h>
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#include <LibWeb/CSS/Selector.h>
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#include <LibWeb/CSS/StyleValue.h>
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namespace Web::CSS {
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class CSSStyleSheet;
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class CSSRule;
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class CSSStyleRule;
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struct StyleProperty;
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enum class PropertyID;
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class ParsingContext {
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public:
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ParsingContext();
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explicit ParsingContext(DOM::Document&);
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explicit ParsingContext(DOM::ParentNode&);
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bool in_quirks_mode() const;
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DOM::Document* document() const { return m_document; }
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URL complete_url(String const&) const;
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private:
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DOM::Document* m_document { nullptr };
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};
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template<typename T>
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class TokenStream {
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public:
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explicit TokenStream(Vector<T> const&);
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~TokenStream();
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bool has_next_token();
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T const& next_token();
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T const& peek_token();
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T const& current_token();
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void reconsume_current_input_token();
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void skip_whitespace();
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void dump_all_tokens();
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private:
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Vector<T> const& m_tokens;
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int m_iterator_offset { -1 };
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T make_eof();
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T m_eof;
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};
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class Parser {
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public:
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Parser(ParsingContext const&, StringView const& input, String const& encoding = "utf-8");
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~Parser();
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// The normal parser entry point, for parsing stylesheets.
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NonnullRefPtr<CSSStyleSheet> parse_as_stylesheet();
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template<typename T>
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NonnullRefPtr<CSSStyleSheet> parse_as_stylesheet(TokenStream<T>&);
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// For the content of at-rules such as @media. It differs from "Parse a stylesheet" in the handling of <CDO-token> and <CDC-token>.
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NonnullRefPtrVector<CSSRule> parse_as_list_of_rules();
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template<typename T>
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NonnullRefPtrVector<CSSRule> parse_as_list_of_rules(TokenStream<T>&);
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// For use by the CSSStyleSheet#insertRule method, and similar functions which might exist, which parse text into a single rule.
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RefPtr<CSSRule> parse_as_rule();
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template<typename T>
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RefPtr<CSSRule> parse_as_rule(TokenStream<T>&);
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// Used in @supports conditions. [CSS3-CONDITIONAL]
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Optional<StyleProperty> parse_as_declaration();
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template<typename T>
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Optional<StyleProperty> parse_as_declaration(TokenStream<T>&);
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// For the contents of a style attribute, which parses text into the contents of a single style rule.
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RefPtr<CSSStyleDeclaration> parse_as_list_of_declarations();
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template<typename T>
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RefPtr<CSSStyleDeclaration> parse_as_list_of_declarations(TokenStream<T>&);
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// For things that need to consume a single value, like the parsing rules for attr().
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Optional<StyleComponentValueRule> parse_as_component_value();
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template<typename T>
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Optional<StyleComponentValueRule> parse_as_component_value(TokenStream<T>&);
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// For the contents of presentational attributes, which parse text into a single declaration’s value, or for parsing a stand-alone selector [SELECT] or list of Media Queries [MEDIAQ], as in Selectors API or the media HTML attribute.
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Vector<StyleComponentValueRule> parse_as_list_of_component_values();
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template<typename T>
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Vector<StyleComponentValueRule> parse_as_list_of_component_values(TokenStream<T>&);
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Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values();
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template<typename T>
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Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values(TokenStream<T>&);
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Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
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// FIXME: https://www.w3.org/TR/selectors-4/
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// Contrary to the name, these parse a comma-separated list of selectors, according to the spec.
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Optional<SelectorList> parse_a_selector();
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template<typename T>
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Optional<SelectorList> parse_a_selector(TokenStream<T>&);
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Optional<SelectorList> parse_a_relative_selector();
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template<typename T>
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Optional<SelectorList> parse_a_relative_selector(TokenStream<T>&);
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RefPtr<StyleValue> parse_css_value(PropertyID, TokenStream<StyleComponentValueRule>&);
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static RefPtr<StyleValue> parse_css_value(ParsingContext const&, PropertyID, StyleComponentValueRule const&);
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private:
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[[nodiscard]] NonnullRefPtrVector<StyleRule> consume_a_list_of_rules(bool top_level);
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template<typename T>
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[[nodiscard]] NonnullRefPtrVector<StyleRule> consume_a_list_of_rules(TokenStream<T>&, bool top_level);
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[[nodiscard]] NonnullRefPtr<StyleRule> consume_an_at_rule();
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template<typename T>
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[[nodiscard]] NonnullRefPtr<StyleRule> consume_an_at_rule(TokenStream<T>&);
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[[nodiscard]] RefPtr<StyleRule> consume_a_qualified_rule();
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template<typename T>
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[[nodiscard]] RefPtr<StyleRule> consume_a_qualified_rule(TokenStream<T>&);
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[[nodiscard]] Vector<DeclarationOrAtRule> consume_a_list_of_declarations();
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template<typename T>
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[[nodiscard]] Vector<DeclarationOrAtRule> consume_a_list_of_declarations(TokenStream<T>&);
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[[nodiscard]] Optional<StyleDeclarationRule> consume_a_declaration();
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template<typename T>
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[[nodiscard]] Optional<StyleDeclarationRule> consume_a_declaration(TokenStream<T>&);
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[[nodiscard]] StyleComponentValueRule consume_a_component_value();
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template<typename T>
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[[nodiscard]] StyleComponentValueRule consume_a_component_value(TokenStream<T>&);
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[[nodiscard]] NonnullRefPtr<StyleBlockRule> consume_a_simple_block();
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template<typename T>
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[[nodiscard]] NonnullRefPtr<StyleBlockRule> consume_a_simple_block(TokenStream<T>&);
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[[nodiscard]] NonnullRefPtr<StyleFunctionRule> consume_a_function();
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template<typename T>
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[[nodiscard]] NonnullRefPtr<StyleFunctionRule> consume_a_function(TokenStream<T>&);
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[[nodiscard]] RefPtr<CSSRule> convert_to_rule(NonnullRefPtr<StyleRule>);
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[[nodiscard]] RefPtr<CSSStyleDeclaration> convert_to_declaration(NonnullRefPtr<StyleBlockRule>);
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[[nodiscard]] Optional<StyleProperty> convert_to_style_property(StyleDeclarationRule&);
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static Optional<float> try_parse_float(StringView string);
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static Optional<Color> parse_color(ParsingContext const&, StyleComponentValueRule const&);
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static Optional<Length> parse_length(ParsingContext const&, StyleComponentValueRule const&);
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static Optional<URL> parse_url_function(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_keyword_or_custom_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_length_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_numeric_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_identifier_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_color_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_string_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_image_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_box_shadow_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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template<typename T>
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Optional<SelectorList> parse_a_selector_list(TokenStream<T>&);
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template<typename T>
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Optional<SelectorList> parse_a_relative_selector_list(TokenStream<T>&);
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enum class SelectorParsingResult {
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Done,
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SyntaxError,
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};
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RefPtr<Selector> parse_complex_selector(TokenStream<StyleComponentValueRule>&, bool allow_starting_combinator);
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Result<Selector::CompoundSelector, SelectorParsingResult> parse_compound_selector(TokenStream<StyleComponentValueRule>&);
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Optional<Selector::Combinator> parse_selector_combinator(TokenStream<StyleComponentValueRule>&);
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Result<Selector::SimpleSelector, SelectorParsingResult> parse_simple_selector(TokenStream<StyleComponentValueRule>&);
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ParsingContext m_context;
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Tokenizer m_tokenizer;
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Vector<Token> m_tokens;
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TokenStream<Token> m_token_stream;
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};
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}
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