From 73d7d6b83120db60c45ffa6fac7b0359e5cb68ea Mon Sep 17 00:00:00 2001
From: Sam Atkins <sam@ladybird.org>
Date: Thu, 21 Aug 2025 16:13:30 +0100
Subject: [PATCH] LibWeb: Generate a math_function_from_string() function

This will be used as a convenient way to see if a string is the name of
a math function.
---
 .../LibWeb/GenerateCSSMathFunctions.cpp       | 32 ++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
index 721cd29ac47..241f0a6ea60 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
@@ -22,9 +22,13 @@ ErrorOr<void> generate_header_file(JsonObject& functions_data, Core::File& file)
 
 #pragma once
 
+#include <AK/Optional.h>
+#include <AK/StringView.h>
+
 namespace Web::CSS {
 
 enum class MathFunction {
+    Calc,
 )~~~");
 
     functions_data.for_each_member([&](auto& name, auto&) {
@@ -36,6 +40,8 @@ enum class MathFunction {
     generator.append(R"~~~(
 };
 
+Optional<MathFunction> math_function_from_string(StringView);
+    
 }
 )~~~");
 
@@ -87,12 +93,36 @@ ErrorOr<void> generate_implementation_file(JsonObject& functions_data, Core::Fil
     generator.append(R"~~~(
 // This file is generated by GenerateCSSMathFunctions.cpp
 
+#include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/MathFunctions.h>
 #include <LibWeb/CSS/Parser/ErrorReporter.h>
 #include <LibWeb/CSS/Parser/Parser.h>
-#include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
 
+namespace Web::CSS {
+
+Optional<MathFunction> math_function_from_string(StringView name)
+{
+    if (name.equals_ignoring_ascii_case("calc"sv))
+        return MathFunction::Calc;
+)~~~");
+
+    functions_data.for_each_member([&](auto& name, auto&) {
+        auto member_generator = generator.fork();
+        member_generator.set("name:lowercase", name);
+        member_generator.set("name:titlecase", title_casify(name));
+        member_generator.append(R"~~~(
+    if (name.equals_ignoring_ascii_case("@name:lowercase@"sv))
+        return MathFunction::@name:titlecase@;
+)~~~");
+    });
+
+    generator.append(R"~~~(
+    return {};
+}
+
+}
+
 namespace Web::CSS::Parser {
 
 static Optional<RoundingStrategy> parse_rounding_strategy(Vector<ComponentValue> const& tokens)