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LibWeb: Parse CSS builtins before other values

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These are straightforward to parse, so doing them first saves
potentially expensive calculations inside parse_foo_value() functions.
This commit is contained in:
Sam Atkins 2021-08-19 15:45:15 +01:00 • committed by Andreas Kling
parent aceea42ba4
commit d2342caf42
2 changed files with 18 additions and 4 deletions
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19
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -1399,7 +1399,7 @@ Optional<float> Parser::try_parse_float(StringView string)
return is_negative ? -value : value;
}
RefPtr<StyleValue> Parser::parse_builtin_or_dynamic_value(ParsingContext const& context, StyleComponentValueRule const& component_value)
RefPtr<StyleValue> Parser::parse_builtin_value(ParsingContext const&, StyleComponentValueRule const& component_value)
{
if (component_value.is(Token::Type::Ident)) {
auto ident = component_value.token().ident();
@ -1410,6 +1410,11 @@ RefPtr<StyleValue> Parser::parse_builtin_or_dynamic_value(ParsingContext const&
// FIXME: Implement `unset` keyword
}
return {};
}
RefPtr<StyleValue> Parser::parse_dynamic_value(ParsingContext const& context, StyleComponentValueRule const& component_value)
{
if (component_value.is_function()) {
auto& function = component_value.function();
@ -2766,6 +2771,11 @@ RefPtr<StyleValue> Parser::parse_css_value(PropertyID property_id, TokenStream<S
if (component_values.is_empty())
return {};
if (component_values.size() == 1) {
if (auto parsed_value = parse_builtin_value(m_context, component_values.first()))
return parsed_value;
}
// Special-case property handling
switch (property_id) {
case PropertyID::Background:
@ -2875,8 +2885,11 @@ RefPtr<StyleValue> Parser::parse_css_value(ParsingContext const& context, Proper
return LengthStyleValue::create(Length::make_px(strtof(string.characters(), nullptr)));
}
if (auto builtin_or_dynamic = parse_builtin_or_dynamic_value(context, component_value))
return builtin_or_dynamic;
if (auto builtin = parse_builtin_value(context, component_value))
return builtin;
if (auto dynamic = parse_dynamic_value(context, component_value))
return dynamic;
if (auto length = parse_length_value(context, component_value))
return length;