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CSSTransformComponents hold other CSSStyleValues as their parameters. We want to be able to create internal representations from those parameters without them caring if they would be valid when directly assigned to the property. This is a temporary solution to make transform functions work. To be completely correct, we need to know what is allowed in that context, along with value ranges - a combination of the contexts we create when parsing, and when computing calculations. For transform functions, this doesn't matter, as there's no limit to the range of allowed values.
135 lines
6 KiB
C++
135 lines
6 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 "CSSStyleValue.h"
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#include <LibWeb/Bindings/CSSStyleValuePrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/PropertyNameAndID.h>
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#include <LibWeb/CSS/StyleValues/StyleValue.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSStyleValue);
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GC::Ref<CSSStyleValue> CSSStyleValue::create(JS::Realm& realm, FlyString associated_property, NonnullRefPtr<StyleValue const> source_value)
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{
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return realm.create<CSSStyleValue>(realm, move(associated_property), move(source_value));
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}
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CSSStyleValue::CSSStyleValue(JS::Realm& realm)
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: PlatformObject(realm)
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{
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}
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CSSStyleValue::CSSStyleValue(JS::Realm& realm, NonnullRefPtr<StyleValue const> source_value)
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: PlatformObject(realm)
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, m_source_value(move(source_value))
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{
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}
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CSSStyleValue::CSSStyleValue(JS::Realm& realm, FlyString associated_property, NonnullRefPtr<StyleValue const> source_value)
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: PlatformObject(realm)
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, m_associated_property(move(associated_property))
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, m_source_value(move(source_value))
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{
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}
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void CSSStyleValue::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSStyleValue);
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Base::initialize(realm);
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}
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CSSStyleValue::~CSSStyleValue() = default;
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssstylevalue-parse
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WebIDL::ExceptionOr<GC::Ref<CSSStyleValue>> CSSStyleValue::parse(JS::VM& vm, FlyString const& property, String css_text)
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{
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// The parse(property, cssText) method, when invoked, must parse a CSSStyleValue with property property, cssText
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// cssText, and parseMultiple set to false, and return the result.
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auto result = parse_a_css_style_value(vm, property, css_text, ParseMultiple::No);
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if (result.is_exception())
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return result.release_error();
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return result.value().get<GC::Ref<CSSStyleValue>>();
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssstylevalue-parseall
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WebIDL::ExceptionOr<GC::RootVector<GC::Ref<CSSStyleValue>>> CSSStyleValue::parse_all(JS::VM& vm, FlyString const& property, String css_text)
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{
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// The parseAll(property, cssText) method, when invoked, must parse a CSSStyleValue with property property, cssText
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// cssText, and parseMultiple set to true, and return the result.
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auto result = parse_a_css_style_value(vm, property, css_text, ParseMultiple::Yes);
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if (result.is_exception())
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return result.release_error();
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return result.value().get<GC::RootVector<GC::Ref<CSSStyleValue>>>();
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#parse-a-cssstylevalue
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WebIDL::ExceptionOr<Variant<GC::Ref<CSSStyleValue>, GC::RootVector<GC::Ref<CSSStyleValue>>>> CSSStyleValue::parse_a_css_style_value(JS::VM& vm, FlyString property_name, String css_text, ParseMultiple parse_multiple)
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{
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// 1. If property is not a custom property name string, set property to property ASCII lowercased.
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// 2. If property is not a valid CSS property, throw a TypeError.
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auto property = PropertyNameAndID::from_name(property_name);
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if (!property.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS property", property_name)) };
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// 3. Attempt to parse cssText according to property’s grammar.
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// If this fails, throw a TypeError.
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// Otherwise, let whole value be the parsed result.
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auto whole_value = parse_css_value(Parser::ParsingParams {}, css_text, property->id());
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if (!whole_value)
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("Failed to parse '{}' as a value for '{}' property", css_text, property->name())) };
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// FIXME: 4. Subdivide into iterations whole value, according to property, and let values be the result.
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// 5. For each value in values, replace it with the result of reifying value for property.
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GC::RootVector<GC::Ref<CSSStyleValue>> reified_values { vm.heap() };
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reified_values.append(whole_value->reify(*vm.current_realm(), property->name()));
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// 6. If parseMultiple is false, return values[0]. Otherwise, return values.
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// FIXME: We need to somehow store the source css_text on the returned CSSStyleValue.
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// https://github.com/w3c/css-houdini-drafts/issues/1156
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if (parse_multiple == ParseMultiple::No)
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return reified_values.take_first();
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return reified_values;
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#stylevalue-serialization
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WebIDL::ExceptionOr<String> CSSStyleValue::to_string() const
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{
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// FIXME: if the value was constructed from a USVString
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// NB: Basically, if this was constructed with "parse a CSSStyleValue", regardless of what CSSStyleValue type it is now.
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{
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// the serialization is the USVString from which the value was constructed.
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}
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// otherwise, if the value was constructed using an IDL constructor
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{
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// the serialization is specified in the sections below.
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// NB: This is handled by subclasses overriding this to_string() method.
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}
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// FIXME: otherwise, if the value was extracted from the CSSOM
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// NB: For CSSStyleValue itself, we use the source value we were created from.
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if (m_source_value)
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return m_source_value->to_string(SerializationMode::Normal);
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{
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// the serialization is specified in §6.7 Serialization from CSSOM Values below.
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}
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return String {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#create-an-internal-representation
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WebIDL::ExceptionOr<NonnullRefPtr<StyleValue const>> CSSStyleValue::create_an_internal_representation(PropertyNameAndID const&, PerformTypeCheck) const
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{
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// If value is a direct CSSStyleValue,
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// Return value’s associated value.
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if (!m_source_value)
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("Missing {}::create_an_internal_representation() overload", class_name())) };
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return NonnullRefPtr { *m_source_value };
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}
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}
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