/* * Copyright (c) 2020, the SerenityOS developers. * * SPDX-License-Identifier: BSD-2-Clause */ #include #include #include #include #include namespace Web::HTML { GC_DEFINE_ALLOCATOR(HTMLLabelElement); HTMLLabelElement::HTMLLabelElement(DOM::Document& document, DOM::QualifiedName qualified_name) : HTMLElement(document, move(qualified_name)) { } HTMLLabelElement::~HTMLLabelElement() = default; void HTMLLabelElement::initialize(JS::Realm& realm) { Base::initialize(realm); WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLLabelElement); } GC::Ptr HTMLLabelElement::create_layout_node(CSS::StyleProperties style) { return heap().allocate(document(), this, move(style)); } // https://html.spec.whatwg.org/multipage/forms.html#labeled-control GC::Ptr HTMLLabelElement::control() const { GC::Ptr control; // The for attribute may be specified to indicate a form control with which the caption is // to be associated. If the attribute is specified, the attribute's value must be the ID of // a labelable element in the same tree as the label element. If the attribute is specified // and there is an element in the tree whose ID is equal to the value of the for attribute, // and the first such element in tree order is a labelable element, then that element is the // label element's labeled control. if (for_().has_value()) { root().for_each_in_inclusive_subtree_of_type([&](auto& element) { if (element.id() == *for_() && element.is_labelable()) { control = &const_cast(element); return TraversalDecision::Break; } return TraversalDecision::Continue; }); return control; } // If the for attribute is not specified, but the label element has a labelable element descendant, // then the first such descendant in tree order is the label element's labeled control. for_each_in_subtree_of_type([&](auto& element) { if (element.is_labelable()) { control = &const_cast(element); return TraversalDecision::Break; } return TraversalDecision::Continue; }); return control; } // https://html.spec.whatwg.org/multipage/forms.html#dom-label-form GC::Ptr HTMLLabelElement::form() const { auto labeled_control = control(); // 1. If the label element has no labeled control, then return null. if (!labeled_control) return {}; // 2. If the label element's labeled control is not a form-associated element, then return null. if (!is(*labeled_control)) return {}; // 3. Return the label element's labeled control's form owner (which can still be null). return dynamic_cast(labeled_control.ptr())->form(); } }