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7f223e2290
Rather than following the spec exactly and creating lowercase strings, we can simply do a case-insensitive string comparison. The caveat is that creating attributes must follow the spec by creating the attribute name with a lowercase string.
215 lines
8 KiB
C++
215 lines
8 KiB
C++
/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Attribute.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/NamedNodeMap.h>
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#include <LibWeb/Namespace.h>
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namespace Web::DOM {
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NonnullRefPtr<NamedNodeMap> NamedNodeMap::create(Element const& associated_element)
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{
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return adopt_ref(*new NamedNodeMap(associated_element));
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}
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NamedNodeMap::NamedNodeMap(Element const& associated_element)
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: m_associated_element(associated_element)
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{
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// Note: To avoid a reference cycle between Element, NamedNodeMap, and Attribute, do not store a
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// strong reference to the associated element.
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}
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// https://dom.spec.whatwg.org/#ref-for-dfn-supported-property-indices%E2%91%A3
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bool NamedNodeMap::is_supported_property_index(u32 index) const
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{
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return index < m_attributes.size();
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}
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// https://dom.spec.whatwg.org/#ref-for-dfn-supported-property-names%E2%91%A0
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Vector<String> NamedNodeMap::supported_property_names() const
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{
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auto associated_element = m_associated_element.strong_ref();
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if (!associated_element)
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return {};
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// 1. Let names be the qualified names of the attributes in this NamedNodeMap object’s attribute list, with duplicates omitted, in order.
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Vector<String> names;
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names.ensure_capacity(m_attributes.size());
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for (auto const& attribute : m_attributes) {
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if (!names.contains_slow(attribute.name()))
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names.append(attribute.name());
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}
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// 2. If this NamedNodeMap object’s element is in the HTML namespace and its node document is an HTML document, then for each name in names:
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// FIXME: Handle the second condition, assume it is an HTML document for now.
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if (associated_element->namespace_uri() == Namespace::HTML) {
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// 1. Let lowercaseName be name, in ASCII lowercase.
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// 2. If lowercaseName is not equal to name, remove name from names.
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names.remove_all_matching([](auto const& name) { return name != name.to_lowercase(); });
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}
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// 3. Return names.
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return names;
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}
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// https://dom.spec.whatwg.org/#dom-namednodemap-item
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Attribute const* NamedNodeMap::item(u32 index) const
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{
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// 1. If index is equal to or greater than this’s attribute list’s size, then return null.
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if (index >= m_attributes.size())
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return nullptr;
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// 2. Otherwise, return this’s attribute list[index].
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return &m_attributes[index];
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}
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// https://dom.spec.whatwg.org/#dom-namednodemap-getnameditem
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Attribute const* NamedNodeMap::get_named_item(StringView qualified_name) const
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{
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return get_attribute(qualified_name);
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}
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// https://dom.spec.whatwg.org/#dom-namednodemap-setnameditem
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ExceptionOr<Attribute const*> NamedNodeMap::set_named_item(Attribute& attribute)
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{
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return set_attribute(attribute);
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}
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// https://dom.spec.whatwg.org/#dom-namednodemap-removenameditem
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ExceptionOr<Attribute const*> NamedNodeMap::remove_named_item(StringView qualified_name)
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{
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// 1. Let attr be the result of removing an attribute given qualifiedName and element.
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auto const* attribute = remove_attribute(qualified_name);
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// 2. If attr is null, then throw a "NotFoundError" DOMException.
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if (!attribute)
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return NotFoundError::create(String::formatted("Attribute with name '{}' not found", qualified_name));
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// 3. Return attr.
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return nullptr;
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-get-by-name
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Attribute* NamedNodeMap::get_attribute(StringView qualified_name, size_t* item_index)
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{
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return const_cast<Attribute*>(const_cast<NamedNodeMap const*>(this)->get_attribute(qualified_name, item_index));
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-get-by-name
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Attribute const* NamedNodeMap::get_attribute(StringView qualified_name, size_t* item_index) const
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{
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auto associated_element = m_associated_element.strong_ref();
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if (!associated_element)
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return nullptr;
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if (item_index)
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*item_index = 0;
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// 1. If element is in the HTML namespace and its node document is an HTML document, then set qualifiedName to qualifiedName in ASCII lowercase.
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// FIXME: Handle the second condition, assume it is an HTML document for now.
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bool compare_as_lowercase = associated_element->namespace_uri() == Namespace::HTML;
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// 2. Return the first attribute in element’s attribute list whose qualified name is qualifiedName; otherwise null.
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for (auto const& attribute : m_attributes) {
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if (compare_as_lowercase) {
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if (attribute.name().equals_ignoring_case(qualified_name))
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return &attribute;
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} else {
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if (attribute.name() == qualified_name)
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return &attribute;
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}
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if (item_index)
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++(*item_index);
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}
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return nullptr;
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-set
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ExceptionOr<Attribute const*> NamedNodeMap::set_attribute(Attribute& attribute)
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{
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auto associated_element = m_associated_element.strong_ref();
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if (!associated_element)
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return nullptr;
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// 1. If attr’s element is neither null nor element, throw an "InUseAttributeError" DOMException.
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if ((attribute.owner_element() != nullptr) && (attribute.owner_element() != associated_element))
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return InUseAttributeError::create("Attribute must not already be in use"sv);
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// 2. Let oldAttr be the result of getting an attribute given attr’s namespace, attr’s local name, and element.
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// FIXME: When getNamedItemNS is implemented, use that instead.
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size_t old_attribute_index = 0;
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auto* old_attribute = get_attribute(attribute.local_name(), &old_attribute_index);
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// 3. If oldAttr is attr, return attr.
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if (old_attribute == &attribute)
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return &attribute;
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// 4. If oldAttr is non-null, then replace oldAttr with attr.
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if (old_attribute) {
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replace_attribute(*old_attribute, attribute, old_attribute_index);
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}
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// 5. Otherwise, append attr to element.
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else {
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append_attribute(attribute);
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}
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// 6. Return oldAttr.
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return old_attribute;
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-replace
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void NamedNodeMap::replace_attribute(Attribute& old_attribute, Attribute& new_attribute, size_t old_attribute_index)
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{
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// 1. Handle attribute changes for oldAttr with oldAttr’s element, oldAttr’s value, and newAttr’s value.
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// FIXME: The steps to handle an attribute change deal with mutation records and custom element states.
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// Once those are supported, implement these steps: https://dom.spec.whatwg.org/#handle-attribute-changes
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// 2. Replace oldAttr by newAttr in oldAttr’s element’s attribute list.
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m_attributes.remove(old_attribute_index);
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m_attributes.insert(old_attribute_index, new_attribute);
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// 3. Set newAttr’s element to oldAttr’s element.
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new_attribute.set_owner_element(old_attribute.owner_element());
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// 4 .Set oldAttr’s element to null.
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old_attribute.set_owner_element(nullptr);
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-append
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void NamedNodeMap::append_attribute(Attribute& attribute)
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{
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// 1. Handle attribute changes for attribute with element, null, and attribute’s value.
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// FIXME: The steps to handle an attribute change deal with mutation records and custom element states.
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// Once those are supported, implement these steps: https://dom.spec.whatwg.org/#handle-attribute-changes
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// 2. Append attribute to element’s attribute list.
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m_attributes.append(attribute);
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// 3. Set attribute’s element to element.
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attribute.set_owner_element(m_associated_element);
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}
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// https://dom.spec.whatwg.org/#concept-element-attributes-remove-by-name
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Attribute const* NamedNodeMap::remove_attribute(StringView qualified_name)
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{
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size_t item_index = 0;
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// 1. Let attr be the result of getting an attribute given qualifiedName and element.
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auto const* attribute = get_attribute(qualified_name, &item_index);
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// 2. If attr is non-null, then remove attr.
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if (attribute)
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m_attributes.remove(item_index);
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// 3. Return attr.
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return attribute;
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}
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}
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