LibWeb: Clarify naming and publicity of CSS Parser methods

`parse_as_foo()` implies that the Parser's internal data is used,
whereas `parse_a_foo()` implies that the passed-in data is used.

Also, made all the `parse_a_foo()` methods private, as they are only
required within the Parser, and this makes the API clearer to outsiders.

The `parse_a(s)_foo()` naming is a little awkward, but it comes from
section 5.3 of the spec, so seemed worth keeping:
https://www.w3.org/TR/css-syntax-3/#parser-entry-points

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -155,11 +155,11 @@ Parser::~Parser()
 
 NonnullRefPtr<CSSStyleSheet> Parser::parse_as_stylesheet()
 {
-    return parse_as_stylesheet(m_token_stream);
+    return parse_a_stylesheet(m_token_stream);
 }
 
 template<typename T>
-NonnullRefPtr<CSSStyleSheet> Parser::parse_as_stylesheet(TokenStream<T>& tokens)
+NonnullRefPtr<CSSStyleSheet> Parser::parse_a_stylesheet(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_stylesheet");
 
@@ -179,7 +179,7 @@ NonnullRefPtr<CSSStyleSheet> Parser::parse_as_stylesheet(TokenStream<T>& tokens)
     return stylesheet;
 }
 
-Optional<SelectorList> Parser::parse_a_selector()
+Optional<SelectorList> Parser::parse_as_selector()
 {
     return parse_a_selector(m_token_stream);
 }
@@ -196,7 +196,7 @@ Optional<SelectorList> Parser::parse_a_selector(TokenStream<T>& tokens)
     return {};
 }
 
-Optional<SelectorList> Parser::parse_a_relative_selector()
+Optional<SelectorList> Parser::parse_as_relative_selector()
 {
     return parse_a_relative_selector(m_token_stream);
 }
@@ -218,7 +218,7 @@ Optional<SelectorList> Parser::parse_a_selector_list(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_a_selector_list");
 
-    auto comma_separated_lists = parse_as_comma_separated_list_of_component_values(tokens);
+    auto comma_separated_lists = parse_a_comma_separated_list_of_component_values(tokens);
 
     NonnullRefPtrVector<Selector> selectors;
     for (auto& selector_parts : comma_separated_lists) {
@@ -241,7 +241,7 @@ Optional<SelectorList> Parser::parse_a_relative_selector_list(TokenStream<T>& to
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_a_relative_selector_list");
 
-    auto comma_separated_lists = parse_as_comma_separated_list_of_component_values(tokens);
+    auto comma_separated_lists = parse_a_comma_separated_list_of_component_values(tokens);
 
     NonnullRefPtrVector<Selector> selectors;
     for (auto& selector_parts : comma_separated_lists) {
@@ -991,11 +991,11 @@ Vector<DeclarationOrAtRule> Parser::consume_a_list_of_declarations(TokenStream<T
 
 RefPtr<CSSRule> Parser::parse_as_rule()
 {
-    return parse_as_rule(m_token_stream);
+    return parse_a_rule(m_token_stream);
 }
 
 template<typename T>
-RefPtr<CSSRule> Parser::parse_as_rule(TokenStream<T>& tokens)
+RefPtr<CSSRule> Parser::parse_a_rule(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_rule");
 
@@ -1030,11 +1030,11 @@ RefPtr<CSSRule> Parser::parse_as_rule(TokenStream<T>& tokens)
 
 NonnullRefPtrVector<CSSRule> Parser::parse_as_list_of_rules()
 {
-    return parse_as_list_of_rules(m_token_stream);
+    return parse_a_list_of_rules(m_token_stream);
 }
 
 template<typename T>
-NonnullRefPtrVector<CSSRule> Parser::parse_as_list_of_rules(TokenStream<T>& tokens)
+NonnullRefPtrVector<CSSRule> Parser::parse_a_list_of_rules(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_list_of_rules");
 
@@ -1052,11 +1052,11 @@ NonnullRefPtrVector<CSSRule> Parser::parse_as_list_of_rules(TokenStream<T>& toke
 
 Optional<StyleProperty> Parser::parse_as_declaration()
 {
-    return parse_as_declaration(m_token_stream);
+    return parse_a_declaration(m_token_stream);
 }
 
 template<typename T>
-Optional<StyleProperty> Parser::parse_as_declaration(TokenStream<T>& tokens)
+Optional<StyleProperty> Parser::parse_a_declaration(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_declaration");
 
@@ -1077,11 +1077,11 @@ Optional<StyleProperty> Parser::parse_as_declaration(TokenStream<T>& tokens)
 
 RefPtr<CSSStyleDeclaration> Parser::parse_as_list_of_declarations()
 {
-    return parse_as_list_of_declarations(m_token_stream);
+    return parse_a_list_of_declarations(m_token_stream);
 }
 
 template<typename T>
-RefPtr<CSSStyleDeclaration> Parser::parse_as_list_of_declarations(TokenStream<T>& tokens)
+RefPtr<CSSStyleDeclaration> Parser::parse_a_list_of_declarations(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_list_of_declarations");
 
@@ -1114,11 +1114,11 @@ RefPtr<CSSStyleDeclaration> Parser::parse_as_list_of_declarations(TokenStream<T>
 
 Optional<StyleComponentValueRule> Parser::parse_as_component_value()
 {
-    return parse_as_component_value(m_token_stream);
+    return parse_a_component_value(m_token_stream);
 }
 
 template<typename T>
-Optional<StyleComponentValueRule> Parser::parse_as_component_value(TokenStream<T>& tokens)
+Optional<StyleComponentValueRule> Parser::parse_a_component_value(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_component_value");
 
@@ -1144,11 +1144,11 @@ Optional<StyleComponentValueRule> Parser::parse_as_component_value(TokenStream<T
 
 Vector<StyleComponentValueRule> Parser::parse_as_list_of_component_values()
 {
-    return parse_as_list_of_component_values(m_token_stream);
+    return parse_a_list_of_component_values(m_token_stream);
 }
 
 template<typename T>
-Vector<StyleComponentValueRule> Parser::parse_as_list_of_component_values(TokenStream<T>& tokens)
+Vector<StyleComponentValueRule> Parser::parse_a_list_of_component_values(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_list_of_component_values");
 
@@ -1167,11 +1167,11 @@ Vector<StyleComponentValueRule> Parser::parse_as_list_of_component_values(TokenS
 
 Vector<Vector<StyleComponentValueRule>> Parser::parse_as_comma_separated_list_of_component_values()
 {
-    return parse_as_comma_separated_list_of_component_values(m_token_stream);
+    return parse_a_comma_separated_list_of_component_values(m_token_stream);
 }
 
 template<typename T>
-Vector<Vector<StyleComponentValueRule>> Parser::parse_as_comma_separated_list_of_component_values(TokenStream<T>& tokens)
+Vector<Vector<StyleComponentValueRule>> Parser::parse_a_comma_separated_list_of_component_values(TokenStream<T>& tokens)
 {
     dbgln_if(CSS_PARSER_DEBUG, "Parser::parse_as_comma_separated_list_of_component_values");
 
@@ -1293,7 +1293,7 @@ RefPtr<CSSStyleDeclaration> Parser::convert_to_declaration(NonnullRefPtr<StyleBl
         return {};
 
     auto stream = TokenStream(block->m_values);
-    return parse_as_list_of_declarations(stream);
+    return parse_a_list_of_declarations(stream);
 }
 
 Optional<StyleProperty> Parser::convert_to_style_property(StyleDeclarationRule& declaration)

Userland/Libraries/LibWeb/CSS/Parser/Parser.h

@@ -75,59 +75,56 @@ public:
 
     // The normal parser entry point, for parsing stylesheets.
     NonnullRefPtr<CSSStyleSheet> parse_as_stylesheet();
-    template<typename T>
-    NonnullRefPtr<CSSStyleSheet> parse_as_stylesheet(TokenStream<T>&);
-
     // For the content of at-rules such as @media. It differs from "Parse a stylesheet" in the handling of <CDO-token> and <CDC-token>.
     NonnullRefPtrVector<CSSRule> parse_as_list_of_rules();
-    template<typename T>
-    NonnullRefPtrVector<CSSRule> parse_as_list_of_rules(TokenStream<T>&);
-
     // For use by the CSSStyleSheet#insertRule method, and similar functions which might exist, which parse text into a single rule.
     RefPtr<CSSRule> parse_as_rule();
-    template<typename T>
-    RefPtr<CSSRule> parse_as_rule(TokenStream<T>&);
-
     // Used in @supports conditions. [CSS3-CONDITIONAL]
     Optional<StyleProperty> parse_as_declaration();
-    template<typename T>
-    Optional<StyleProperty> parse_as_declaration(TokenStream<T>&);
-
     // For the contents of a style attribute, which parses text into the contents of a single style rule.
     RefPtr<CSSStyleDeclaration> parse_as_list_of_declarations();
-    template<typename T>
-    RefPtr<CSSStyleDeclaration> parse_as_list_of_declarations(TokenStream<T>&);
-
     // For things that need to consume a single value, like the parsing rules for attr().
     Optional<StyleComponentValueRule> parse_as_component_value();
-    template<typename T>
-    Optional<StyleComponentValueRule> parse_as_component_value(TokenStream<T>&);
-
     // 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.
     Vector<StyleComponentValueRule> parse_as_list_of_component_values();
-    template<typename T>
-    Vector<StyleComponentValueRule> parse_as_list_of_component_values(TokenStream<T>&);
-
     Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values();
-    template<typename T>
-    Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values(TokenStream<T>&);
 
-    Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
-
-    // FIXME: https://www.w3.org/TR/selectors-4/
     // Contrary to the name, these parse a comma-separated list of selectors, according to the spec.
-    Optional<SelectorList> parse_a_selector();
+    Optional<SelectorList> parse_as_selector();
-    template<typename T>
+    Optional<SelectorList> parse_as_relative_selector();
-    Optional<SelectorList> parse_a_selector(TokenStream<T>&);
-
-    Optional<SelectorList> parse_a_relative_selector();
-    template<typename T>
-    Optional<SelectorList> parse_a_relative_selector(TokenStream<T>&);
 
+    // FIXME: These want to be private, but StyleResolver still uses them for now.
     RefPtr<StyleValue> parse_css_value(PropertyID, TokenStream<StyleComponentValueRule>&);
     static RefPtr<StyleValue> parse_css_value(ParsingContext const&, PropertyID, StyleComponentValueRule const&);
 
 private:
+    template<typename T>
+    NonnullRefPtr<CSSStyleSheet> parse_a_stylesheet(TokenStream<T>&);
+    template<typename T>
+    NonnullRefPtrVector<CSSRule> parse_a_list_of_rules(TokenStream<T>&);
+    template<typename T>
+    RefPtr<CSSRule> parse_a_rule(TokenStream<T>&);
+    template<typename T>
+    Optional<StyleProperty> parse_a_declaration(TokenStream<T>&);
+    template<typename T>
+    RefPtr<CSSStyleDeclaration> parse_a_list_of_declarations(TokenStream<T>&);
+    template<typename T>
+    Optional<StyleComponentValueRule> parse_a_component_value(TokenStream<T>&);
+    template<typename T>
+    Vector<StyleComponentValueRule> parse_a_list_of_component_values(TokenStream<T>&);
+    template<typename T>
+    Vector<Vector<StyleComponentValueRule>> parse_a_comma_separated_list_of_component_values(TokenStream<T>&);
+    template<typename T>
+    Optional<SelectorList> parse_a_selector(TokenStream<T>&);
+    template<typename T>
+    Optional<SelectorList> parse_a_relative_selector(TokenStream<T>&);
+    template<typename T>
+    Optional<SelectorList> parse_a_selector_list(TokenStream<T>&);
+    template<typename T>
+    Optional<SelectorList> parse_a_relative_selector_list(TokenStream<T>&);
+
+    Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
+
     [[nodiscard]] NonnullRefPtrVector<StyleRule> consume_a_list_of_rules(bool top_level);
     template<typename T>
     [[nodiscard]] NonnullRefPtrVector<StyleRule> consume_a_list_of_rules(TokenStream<T>&, bool top_level);
@@ -191,11 +188,6 @@ private:
     static OwnPtr<CalculatedStyleValue::CalcNumberSumPartWithOperator> parse_calc_number_sum_part_with_operator(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
     static OwnPtr<CalculatedStyleValue::CalcSum> parse_calc_expression(ParsingContext const&, Vector<StyleComponentValueRule> const&);
 
-    template<typename T>
-    Optional<SelectorList> parse_a_selector_list(TokenStream<T>&);
-    template<typename T>
-    Optional<SelectorList> parse_a_relative_selector_list(TokenStream<T>&);
-
     enum class SelectorParsingResult {
         Done,
         SyntaxError,