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LibWeb: Bring parse_a_declaration() to spec and add comments

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User code now calls `parse_as_supports_condition()` which actually does
the conversion to a StyleProperty.
This commit is contained in:
Sam Atkins 2022-03-30 12:05:16 +01:00 • committed by Andreas Kling
parent 239c36a19e
commit 2aac9f9258
3 changed files with 22 additions and 12 deletions
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26
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -1932,26 +1932,36 @@ NonnullRefPtrVector<StyleRule> Parser::parse_a_list_of_rules(TokenStream<T>& tok
return list_of_rules;
}
Optional<StyleProperty> Parser::parse_as_declaration()
Optional<StyleProperty> Parser::parse_as_supports_condition()
{
return parse_a_declaration(m_token_stream);
auto maybe_declaration = parse_a_declaration(m_token_stream);
if (maybe_declaration.has_value())
return convert_to_style_property(maybe_declaration.release_value());
return {};
}
// 5.3.6. Parse a declaration
// https://www.w3.org/TR/css-syntax-3/#parse-a-declaration
template<typename T>
Optional<StyleProperty> Parser::parse_a_declaration(TokenStream<T>& tokens)
Optional<StyleDeclarationRule> Parser::parse_a_declaration(TokenStream<T>& tokens)
{
// To parse a declaration from input:
// 1. Normalize input, and set input to the result.
// Note: This is done when initializing the Parser.
// 2. While the next input token from input is a <whitespace-token>, consume the next input token.
tokens.skip_whitespace();
// 3. If the next input token from input is not an <ident-token>, return a syntax error.
auto& token = tokens.peek_token();
if (!token.is(Token::Type::Ident)) {
return {};
}
auto declaration = consume_a_declaration(tokens);
if (declaration.has_value())
return convert_to_style_property(declaration.value());
// 4. Consume a declaration from input. If anything was returned, return it. Otherwise, return a syntax error.
if (auto declaration = consume_a_declaration(tokens); declaration.has_value())
return declaration.release_value();
return {};
}

6
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
View file

@ -89,8 +89,6 @@ public:
Parser(ParsingContext const&, StringView input, String const& encoding = "utf-8");
~Parser() = default;
// Used in @supports conditions. [CSS3-CONDITIONAL]
Optional<StyleProperty> parse_as_declaration();
// For the contents of a style attribute, which parses text into the contents of a single style rule.
Vector<DeclarationOrAtRule> parse_as_list_of_declarations();
// For things that need to consume a single value, like the parsing rules for attr().
@ -102,6 +100,7 @@ public:
NonnullRefPtr<CSSStyleSheet> parse_as_css_stylesheet(Optional<AK::URL> location);
RefPtr<ElementInlineCSSStyleDeclaration> parse_as_style_attribute(DOM::Element&);
RefPtr<CSSRule> parse_as_css_rule();
Optional<StyleProperty> parse_as_supports_condition();
enum class SelectorParsingMode {
Standard,
@ -146,8 +145,9 @@ private:
template<typename T>
RefPtr<StyleRule> parse_a_rule(TokenStream<T>&);
// "Parse a declaration" is used in @supports conditions. [CSS3-CONDITIONAL]
template<typename T>
Optional<StyleProperty> parse_a_declaration(TokenStream<T>&);
Optional<StyleDeclarationRule> parse_a_declaration(TokenStream<T>&);
template<typename T>
Vector<DeclarationOrAtRule> parse_a_list_of_declarations(TokenStream<T>&);
template<typename T>

2
Userland/Libraries/LibWeb/CSS/Supports.cpp
View file

@ -52,7 +52,7 @@ bool Supports::InParens::evaluate() const
bool Supports::Declaration::evaluate() const
{
auto style_property = Parser({}, declaration).parse_as_declaration();
auto style_property = Parser({}, declaration).parse_as_supports_condition();
return style_property.has_value();
}