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DOMMatrix.to_string() throws exceptions if any of its values are non-finite. This ends up affecting CSSStyleValue because its subclass CSSTransformValue (which is about to be added) serializes CSSTransformComponents, and one of those is CSSMatrixComponent, which calls DOMMatrix.to_string(). This is all quite unfortunate, and because at the time the spec for DOMMatrix was written, CSS couldn't represent NaN or infinity. That's no longer true, so I'm hoping the spec can be updated and this can be reverted. https://github.com/w3c/fxtf-drafts/issues/611
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/*
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* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CSSSkewX.h"
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#include <LibWeb/Bindings/CSSSkewXPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/CSSNumericValue.h>
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#include <LibWeb/CSS/CSSUnitValue.h>
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#include <LibWeb/Geometry/DOMMatrix.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSSkewX);
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GC::Ref<CSSSkewX> CSSSkewX::create(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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{
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return realm.create<CSSSkewX>(realm, ax);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssskewx-cssskewx
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WebIDL::ExceptionOr<GC::Ref<CSSSkewX>> CSSSkewX::construct_impl(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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{
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// The CSSSkewX(ax) constructor must, when invoked, perform the following steps:
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// 1. If ax does not match <angle>, throw a TypeError.
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if (!ax->type().matches_angle({}))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "CSSSkewX ax component doesn't match <angle>"sv };
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// 2. Return a new CSSSkewX object with its ax internal slot set to ax, and its is2D internal slot set to true.
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return CSSSkewX::create(realm, ax);
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}
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CSSSkewX::CSSSkewX(JS::Realm& realm, GC::Ref<CSSNumericValue> ax)
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: CSSTransformComponent(realm, Is2D::Yes)
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, m_ax(ax)
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{
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}
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CSSSkewX::~CSSSkewX() = default;
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void CSSSkewX::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSSkewX);
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Base::initialize(realm);
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}
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void CSSSkewX::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_ax);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#serialize-a-cssskewx
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WebIDL::ExceptionOr<Utf16String> CSSSkewX::to_string() const
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{
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// 1. Let s initially be "skewX(".
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StringBuilder builder { StringBuilder::Mode::UTF16 };
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builder.append("skewX("sv);
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// 2. Serialize this’s ax internal slot, and append it to s.
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builder.append(TRY(m_ax->to_string()));
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// 3. Append ")" to s, and return s.
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builder.append(")"sv);
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return builder.to_utf16_string();
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-csstransformcomponent-tomatrix
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WebIDL::ExceptionOr<GC::Ref<Geometry::DOMMatrix>> CSSSkewX::to_matrix() const
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{
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// 1. Let matrix be a new DOMMatrix object, initialized to this’s equivalent 4x4 transform matrix, as defined in
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// CSS Transforms 1 § 12. Mathematical Description of Transform Functions, and with its is2D internal slot set
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// to the same value as this’s is2D internal slot.
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// NOTE: Recall that the is2D flag affects what transform, and thus what equivalent matrix, a
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// CSSTransformComponent represents.
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// As the entries of such a matrix are defined relative to the px unit, if any <length>s in this involved in
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// generating the matrix are not compatible units with px (such as relative lengths or percentages), throw a
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// TypeError.
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auto matrix = Geometry::DOMMatrix::create(realm());
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// NB: to() throws a TypeError if the conversion can't be done.
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auto ax_rad = TRY(m_ax->to("rad"_fly_string))->value();
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matrix->set_m21(tanf(ax_rad));
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// 2. Return matrix.
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return matrix;
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}
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WebIDL::ExceptionOr<void> CSSSkewX::set_ax(GC::Ref<CSSNumericValue> ax)
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{
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// AD-HOC: Not specced. https://github.com/w3c/css-houdini-drafts/issues/1153
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// WPT expects this to throw for invalid values.
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if (!ax->type().matches_angle({}))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "CSSSkewX ax component doesn't match <angle>"sv };
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m_ax = ax;
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return {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssskew-is2d
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void CSSSkewX::set_is_2d(bool)
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{
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// The is2D attribute of a CSSSkewX, CSSSkewXX, or CSSSkewXY object must, on setting, do nothing.
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}
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}
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