Source/WebCore/style/CustomFunctionRegistry.h

/*
 * Copyright (C) 2026 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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#pragma once

#include "StyleRuleFunction.h"

namespace WebCore {
namespace Style {

// CustomFunction registration represents @function after things like conditional group rules (@media) and cascade layers have been resolved.
// https://drafts.csswg.org/css-mixins/#evaluating-custom-functions

struct CustomFunction : CanMakeCheckedPtr<CustomFunction> {
    AtomString name;
    const Vector<StyleRuleFunction::Parameter> parameters;
    Ref<const StyleProperties> properties;

    CustomFunction(const AtomString&, const Vector<StyleRuleFunction::Parameter>&, const StyleProperties&);

    WTF_MAKE_STRUCT_TZONE_ALLOCATED(CustomFunction);
    WTF_STRUCT_OVERRIDE_DELETE_FOR_CHECKED_PTR(CustomFunction);
};

class CustomFunctionRegistry : public CanMakeCheckedPtr<CustomFunctionRegistry> {
    WTF_MAKE_TZONE_ALLOCATED(CustomFunctionRegistry);
    WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(CustomFunctionRegistry);
public:
    CustomFunctionRegistry() = default;

    const CustomFunction* functionForName(const AtomString&) const;
    void registerFunction(const StyleRuleFunction&, const Vector<Ref<const StyleRuleFunctionDeclarations>>&);

private:
    HashMap<AtomString, UniqueRef<const CustomFunction>> m_functions;
};

}

}