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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
114 lines
4.7 KiB
C++
114 lines
4.7 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 "CSSVariableReferenceValue.h"
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#include <LibWeb/Bindings/CSSVariableReferenceValuePrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/CSSUnparsedValue.h>
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#include <LibWeb/CSS/PropertyName.h>
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#include <LibWeb/HTML/CustomElements/CustomElementName.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSVariableReferenceValue);
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GC::Ref<CSSVariableReferenceValue> CSSVariableReferenceValue::create(JS::Realm& realm, FlyString variable, GC::Ptr<CSSUnparsedValue> fallback)
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{
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return realm.create<CSSVariableReferenceValue>(realm, move(variable), move(fallback));
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssvariablereferencevalue-cssvariablereferencevalue
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WebIDL::ExceptionOr<GC::Ref<CSSVariableReferenceValue>> CSSVariableReferenceValue::construct_impl(JS::Realm& realm, FlyString variable, GC::Ptr<CSSUnparsedValue> fallback)
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{
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// The CSSVariableReferenceValue(variable, fallback) constructor must, when called, perform the following steps:
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// 1. If variable is not a custom property name string, throw a TypeError.
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if (!is_a_custom_property_name_string(variable))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS custom property name", variable)) };
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// 2. Return a new CSSVariableReferenceValue with its variable internal slot set to variable and its fallback internal slot set to fallback.
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return CSSVariableReferenceValue::create(realm, move(variable), move(fallback));
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}
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CSSVariableReferenceValue::CSSVariableReferenceValue(JS::Realm& realm, FlyString variable, GC::Ptr<CSSUnparsedValue> fallback)
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: Bindings::PlatformObject(realm)
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, m_variable(move(variable))
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, m_fallback(move(fallback))
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{
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}
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CSSVariableReferenceValue::~CSSVariableReferenceValue() = default;
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void CSSVariableReferenceValue::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSVariableReferenceValue);
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Base::initialize(realm);
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}
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void CSSVariableReferenceValue::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_fallback);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssvariablereferencevalue-variable
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String CSSVariableReferenceValue::variable() const
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{
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// The getter for the variable attribute of a CSSVariableReferenceValue this must return its variable internal slot.
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return m_variable.to_string();
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssvariablereferencevalue-variable
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WebIDL::ExceptionOr<void> CSSVariableReferenceValue::set_variable(FlyString variable)
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{
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// The variable attribute of a CSSVariableReferenceValue this must, on setting a variable variable, perform the following steps:
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// 1. If variable is not a custom property name string, throw a TypeError.
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if (!is_a_custom_property_name_string(variable))
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS custom property name", variable)) };
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// 2. Otherwise, set this’s variable internal slot to variable.
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m_variable = move(variable);
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return {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssvariablereferencevalue-fallback
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GC::Ptr<CSSUnparsedValue> CSSVariableReferenceValue::fallback() const
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{
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// AD-HOC: No spec algorithm, see https://github.com/w3c/css-houdini-drafts/issues/1146#issuecomment-3188550133
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return m_fallback;
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssvariablereferencevalue-fallback
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WebIDL::ExceptionOr<void> CSSVariableReferenceValue::set_fallback(GC::Ptr<CSSUnparsedValue> fallback)
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{
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// AD-HOC: No spec algorithm, see https://github.com/w3c/css-houdini-drafts/issues/1146#issuecomment-3188550133
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m_fallback = move(fallback);
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return {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#serialize-a-cssvariablereferencevalue
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WebIDL::ExceptionOr<String> CSSVariableReferenceValue::to_string() const
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{
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// To serialize a CSSVariableReferenceValue this:
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// 1. Let s initially be "var(".
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StringBuilder s;
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s.append("var("sv);
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// 2. Append this’s variable internal slot to s.
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s.append(m_variable);
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// 3. If this’s fallback internal slot is not null, append ", " to s, then serialize the fallback internal slot and append it to s.
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if (m_fallback) {
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// AD-HOC: Tested behaviour requires we append "," without the space. https://github.com/w3c/css-houdini-drafts/issues/1148
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s.append(","sv);
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s.append(TRY(m_fallback->to_string()));
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}
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// 4. Append ")" to s and return s.
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s.append(")"sv);
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return s.to_string_without_validation();
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}
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}
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