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LibWeb: Implement value_id_from_string by hash lookup

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The old approach was basically a linear scan, which is slower than a
hash map for the currently 303 elements, as evidenced by the new
benchmark in TestCSSIDSpeed.

Before: Completed benchmark 'value_id_from_string' in 3238ms
After: Completed benchmark 'value_id_from_string' in 193ms
This commit is contained in:
Ben Wiederhake 2023-01-09 19:08:37 +01:00 • committed by Andrew Kaster
parent b3d2fdceb1
commit 23d111a459
1 changed files with 9 additions and 5 deletions
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14
Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
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@ -85,12 +85,12 @@ ErrorOr<void> generate_implementation_file(JsonArray& identifier_data, Core::Str
generator.append(R"~~~( generator.append(R"~~~(
#include <AK/Assertions.h> #include <AK/Assertions.h>
#include <AK/HashMap.h>
#include <LibWeb/CSS/ValueID.h> #include <LibWeb/CSS/ValueID.h>
namespace Web::CSS { namespace Web::CSS {
ValueID value_id_from_string(StringView string) HashMap<StringView, ValueID, AK::CaseInsensitiveStringViewTraits> g_stringview_to_value_id_map {
{
)~~~"); )~~~");
identifier_data.for_each([&](auto& name) { identifier_data.for_each([&](auto& name) {
@ -98,13 +98,17 @@ ValueID value_id_from_string(StringView string)
member_generator.set("name", name.to_deprecated_string()); member_generator.set("name", name.to_deprecated_string());
member_generator.set("name:titlecase", title_casify(name.to_deprecated_string())); member_generator.set("name:titlecase", title_casify(name.to_deprecated_string()));
member_generator.append(R"~~~( member_generator.append(R"~~~(
if (string.equals_ignoring_case("@name@"sv)) {"@name@"sv, ValueID::@name:titlecase@},
return ValueID::@name:titlecase@;
)~~~"); )~~~");
}); });
generator.append(R"~~~( generator.append(R"~~~(
return ValueID::Invalid; };
ValueID value_id_from_string(StringView string)
{
auto maybe_value_id = g_stringview_to_value_id_map.get(string);
return maybe_value_id.value_or(ValueID::Invalid);
} }
StringView string_from_value_id(ValueID value_id) { StringView string_from_value_id(ValueID value_id) {