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988a8ed3d8
This is done a bit differently from other properties: using a TokenStream instead of just a Vector of ComponentValues. The reason for this is, we can then use call the same function when parsing the `background` shorthand. Otherwise, we would have to know in advance how many values to pass down, which basically would involve duplicating the `background-position` parsing code inside `background`. The StyleValue is PositionStyleValue, since it represents a `<position>`: https://www.w3.org/TR/css-values-4/#typedef-position Unfortunately, background-position's parsing is a bit different from `<position>`'s, (background-position allows 3-value syntax and `<position>` doesn't) so we'll need to come back and write a different parsing function for that later.
284 lines
15 KiB
C++
284 lines
15 KiB
C++
/*
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* Copyright (c) 2020-2021, the SerenityOS developers.
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
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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/CSSStyleDeclaration.h>
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#include <LibWeb/CSS/MediaQuery.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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#include <LibWeb/CSS/Supports.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() = default;
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explicit ParsingContext(DOM::Document const&);
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explicit ParsingContext(DOM::ParentNode&);
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bool in_quirks_mode() const;
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DOM::Document const* document() const { return m_document; }
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AK::URL complete_url(String const&) const;
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PropertyID current_property_id() const { return m_current_property_id; }
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void set_current_property_id(PropertyID property_id) { m_current_property_id = property_id; }
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private:
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DOM::Document const* m_document { nullptr };
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PropertyID m_current_property_id { PropertyID::Invalid };
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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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int position() const { return m_iterator_offset; }
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void rewind_to_position(int);
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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<PropertyOwningCSSStyleDeclaration> 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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NonnullRefPtrVector<MediaQuery> parse_as_media_query_list();
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RefPtr<MediaQuery> parse_as_media_query();
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RefPtr<Supports> parse_as_supports();
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RefPtr<StyleValue> parse_as_css_value(PropertyID);
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// FIXME: This is a hack, while CSS::Supports is using a StyleDeclarationRule
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[[nodiscard]] Optional<StyleProperty> convert_to_style_property(StyleDeclarationRule const&);
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private:
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enum class ParsingResult {
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Done,
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IncludesIgnoredVendorPrefix,
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SyntaxError,
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};
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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<PropertyOwningCSSStyleDeclaration> 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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Result<SelectorList, ParsingResult> parse_a_selector(TokenStream<T>&);
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template<typename T>
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Result<SelectorList, ParsingResult> parse_a_relative_selector(TokenStream<T>&);
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template<typename T>
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Result<SelectorList, ParsingResult> parse_a_selector_list(TokenStream<T>&);
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template<typename T>
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Result<SelectorList, ParsingResult> parse_a_relative_selector_list(TokenStream<T>&);
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template<typename T>
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NonnullRefPtrVector<MediaQuery> parse_a_media_query_list(TokenStream<T>&);
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template<typename T>
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RefPtr<Supports> parse_a_supports(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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struct GeneralEnclosed {
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};
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[[nodiscard]] Optional<GeneralEnclosed> parse_general_enclosed();
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template<typename T>
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[[nodiscard]] Optional<GeneralEnclosed> parse_general_enclosed(TokenStream<T>&);
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[[nodiscard]] RefPtr<CSSRule> convert_to_rule(NonnullRefPtr<StyleRule>);
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[[nodiscard]] RefPtr<PropertyOwningCSSStyleDeclaration> convert_to_declaration(NonnullRefPtr<StyleBlockRule>);
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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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enum class AllowedDataUrlType {
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None,
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Image,
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};
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static Optional<AK::URL> parse_url_function(ParsingContext const&, StyleComponentValueRule const&, AllowedDataUrlType = AllowedDataUrlType::None);
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Result<NonnullRefPtr<StyleValue>, ParsingResult> parse_css_value(PropertyID, TokenStream<StyleComponentValueRule>&);
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static RefPtr<StyleValue> parse_css_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_builtin_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_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_background_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_background_image_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_single_background_position_value(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static RefPtr<StyleValue> parse_background_position_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_background_repeat_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_border_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_border_radius_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_border_radius_shorthand_value(ParsingContext const&, Vector<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_flex_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_flex_flow_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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static RefPtr<StyleValue> parse_font_family_value(ParsingContext const&, Vector<StyleComponentValueRule> const&, size_t start_index = 0);
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static RefPtr<StyleValue> parse_list_style_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_overflow_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_text_decoration_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_transform_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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Result<NonnullRefPtr<Selector>, ParsingResult> parse_complex_selector(TokenStream<StyleComponentValueRule>&, bool allow_starting_combinator);
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Result<Selector::CompoundSelector, ParsingResult> parse_compound_selector(TokenStream<StyleComponentValueRule>&);
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Optional<Selector::Combinator> parse_selector_combinator(TokenStream<StyleComponentValueRule>&);
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Result<Selector::SimpleSelector, ParsingResult> parse_simple_selector(TokenStream<StyleComponentValueRule>&);
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NonnullRefPtr<MediaQuery> parse_media_query(TokenStream<StyleComponentValueRule>&);
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OwnPtr<MediaQuery::MediaCondition> consume_media_condition(TokenStream<StyleComponentValueRule>&);
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Optional<MediaQuery::MediaFeature> consume_media_feature(TokenStream<StyleComponentValueRule>&);
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Optional<MediaQuery::MediaType> consume_media_type(TokenStream<StyleComponentValueRule>&);
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OwnPtr<Supports::Condition> parse_supports_condition(TokenStream<StyleComponentValueRule>&);
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Optional<Supports::InParens> parse_supports_in_parens(TokenStream<StyleComponentValueRule>&);
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Optional<Supports::Feature> parse_supports_feature(TokenStream<StyleComponentValueRule>&);
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static bool has_ignored_vendor_prefix(StringView const&);
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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::PropertyOwningCSSStyleDeclaration> 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::CSSRule> parse_css_rule(CSS::ParsingContext const&, StringView);
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RefPtr<CSS::MediaQuery> parse_media_query(CSS::ParsingContext const&, StringView const&);
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NonnullRefPtrVector<CSS::MediaQuery> parse_media_query_list(CSS::ParsingContext const&, StringView const&);
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RefPtr<CSS::Supports> parse_css_supports(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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