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