59501f1940
After working with the code for a while, it makes more sense to put all the parsing in Parser, instead of some of it living in StyleResolver. That means our current ValueListStyleValue needs to be replaced with specific StyleValue types for the properties that are shorthands or otherwise combine several values together. Here we implement FontStyleProperty, which represents a `font` CSS property. Also adjusted the fonts.html test page so that font-weights are featured in test cases without things we do not yet support.
222 lines
11 KiB
C++
222 lines
11 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(int offset = 0);
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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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// 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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// 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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// Used in @supports conditions. [CSS3-CONDITIONAL]
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Optional<StyleProperty> parse_as_declaration();
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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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// 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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// 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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Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values();
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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_as_selector();
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Optional<SelectorList> parse_as_relative_selector();
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RefPtr<StyleValue> parse_as_css_value(PropertyID);
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// FIXME: These want to be private, but StyleResolver still uses them for now.
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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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template<typename T>
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NonnullRefPtr<CSSStyleSheet> parse_a_stylesheet(TokenStream<T>&);
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template<typename T>
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NonnullRefPtrVector<CSSRule> parse_a_list_of_rules(TokenStream<T>&);
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template<typename T>
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RefPtr<CSSRule> parse_a_rule(TokenStream<T>&);
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template<typename T>
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Optional<StyleProperty> parse_a_declaration(TokenStream<T>&);
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template<typename T>
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RefPtr<CSSStyleDeclaration> parse_a_list_of_declarations(TokenStream<T>&);
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template<typename T>
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Optional<StyleComponentValueRule> parse_a_component_value(TokenStream<T>&);
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template<typename T>
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Vector<StyleComponentValueRule> parse_a_list_of_component_values(TokenStream<T>&);
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template<typename T>
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Vector<Vector<StyleComponentValueRule>> parse_a_comma_separated_list_of_component_values(TokenStream<T>&);
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template<typename T>
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Optional<SelectorList> parse_a_selector(TokenStream<T>&);
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template<typename T>
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Optional<SelectorList> parse_a_relative_selector(TokenStream<T>&);
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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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Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
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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_builtin_or_dynamic_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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static RefPtr<StyleValue> parse_font_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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// calc() parsing, according to https://www.w3.org/TR/css-values-3/#calc-syntax
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static OwnPtr<CalculatedStyleValue::CalcSum> parse_calc_sum(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcProduct> parse_calc_product(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static Optional<CalculatedStyleValue::CalcValue> parse_calc_value(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcNumberSum> parse_calc_number_sum(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcNumberProduct> parse_calc_number_product(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static Optional<CalculatedStyleValue::CalcNumberValue> parse_calc_number_value(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcProductPartWithOperator> parse_calc_product_part_with_operator(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcSumPartWithOperator> parse_calc_sum_part_with_operator(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcNumberProductPartWithOperator> parse_calc_number_product_part_with_operator(ParsingContext const&, TokenStream<StyleComponentValueRule>& tokens);
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static OwnPtr<CalculatedStyleValue::CalcNumberSumPartWithOperator> parse_calc_number_sum_part_with_operator(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static OwnPtr<CalculatedStyleValue::CalcSum> parse_calc_expression(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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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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namespace Web {
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RefPtr<CSS::CSSStyleSheet> parse_css(CSS::ParsingContext const&, StringView const&);
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RefPtr<CSS::CSSStyleDeclaration> parse_css_declaration(CSS::ParsingContext const&, StringView const&);
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RefPtr<CSS::StyleValue> parse_css_value(CSS::ParsingContext const&, StringView const&, CSS::PropertyID property_id = CSS::PropertyID::Invalid);
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Optional<CSS::SelectorList> parse_selector(CSS::ParsingContext const&, StringView const&);
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RefPtr<CSS::StyleValue> parse_html_length(DOM::Document const&, StringView const&);
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}
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