Source/WebCore/css/typedom/transform/CSSPerspective.cpp

/*
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 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "CSSPerspective.h"

#if ENABLE(CSS_TYPED_OM)

#include "CSSKeywordValue.h"
#include "CSSUnitValue.h"
#include "DOMMatrix.h"
#include "ExceptionOr.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(CSSPerspective);

static ExceptionOr<CSSPerspectiveValue> checkLength(CSSPerspectiveValue length)
{
    // https://drafts.css-houdini.org/css-typed-om/#dom-cssperspective-cssperspective
    auto checkKeywordValue = [] (RefPtr<CSSKeywordValue> value) -> ExceptionOr<CSSPerspectiveValue> {
        RELEASE_ASSERT(value);
        if (!equalLettersIgnoringASCIICase(value->value(), "none"_s))
            return Exception { TypeError };
        return { WTFMove(value) };
    };
    return WTF::switchOn(WTFMove(length),
        [] (RefPtr<CSSNumericValue> value) -> ExceptionOr<CSSPerspectiveValue> {
            if (value && !value->type().matches<CSSNumericBaseType::Length>())
                return Exception { TypeError };
            return { WTFMove(value) };
        }, [&] (String value) {
            return checkKeywordValue(CSSKeywordValue::rectifyKeywordish(WTFMove(value)));
        }, checkKeywordValue);
}

ExceptionOr<Ref<CSSPerspective>> CSSPerspective::create(CSSPerspectiveValue length)
{
    auto checkedLength = checkLength(WTFMove(length));
    if (checkedLength.hasException())
        return checkedLength.releaseException();
    return adoptRef(*new CSSPerspective(checkedLength.releaseReturnValue()));
}

CSSPerspective::CSSPerspective(CSSPerspectiveValue length)
    : CSSTransformComponent(Is2D::No)
    , m_length(WTFMove(length))
{
}

ExceptionOr<void> CSSPerspective::setLength(CSSPerspectiveValue length)
{
    auto checkedLength = checkLength(WTFMove(length));
    if (checkedLength.hasException())
        return checkedLength.releaseException();
    m_length = checkedLength.releaseReturnValue();
    return { };
}

void CSSPerspective::setIs2D(bool)
{
    // https://drafts.css-houdini.org/css-typed-om/#dom-cssperspective-is2d says to do nothing here.
}

void CSSPerspective::serialize(StringBuilder& builder) const
{
    // https://drafts.css-houdini.org/css-typed-om/#serialize-a-cssperspective
    builder.append("perspective(");
    WTF::switchOn(m_length,
        [&] (const RefPtr<CSSNumericValue>& value) {
            if (auto* unitValue = dynamicDowncast<CSSUnitValue>(value.get()); unitValue && unitValue->value() < 0.0) {
                builder.append("calc(");
                value->serialize(builder);
                builder.append(')');
                return;
            }
            if (value)
                value->serialize(builder);
        }, [&] (const String& value) {
            builder.append(value);
        }, [&] (const RefPtr<CSSKeywordValue>& value) {
            if (CSSStyleValue* styleValue = value.get())
                styleValue->serialize(builder);
        });
    builder.append(')');
}

ExceptionOr<Ref<DOMMatrix>> CSSPerspective::toMatrix()
{
    // FIXME: Implement.
    return DOMMatrix::fromMatrix(DOMMatrixInit { });
}

} // namespace WebCore

#endif