check_element() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js lines 56–563

export function check_element(node, context) {
	/** @type {Map<string, AST.Attribute>} */
	const attribute_map = new Map();

	/** @type {Set<string>} */
	const handlers = new Set();

	/** @type {AST.Attribute[]} */
	const attributes = [];

	const is_dynamic_element = node.type === 'SvelteElement';

	let has_spread = false;
	let has_contenteditable_attr = false;
	let has_contenteditable_binding = false;

	for (const attribute of node.attributes) {
		switch (attribute.type) {
			case 'Attribute': {
				if (is_event_attribute(attribute)) {
					handlers.add(attribute.name.slice(2));
				} else {
					attributes.push(attribute);
					attribute_map.set(attribute.name, attribute);
					if (attribute.name === 'contenteditable') {
						has_contenteditable_attr = true;
					}
				}
				break;
			}
			case 'SpreadAttribute': {
				has_spread = true;
				break;
			}
			case 'BindDirective': {
				if (is_content_editable_binding(attribute.name)) {
					has_contenteditable_binding = true;
				}
				break;
			}
			case 'OnDirective': {
				handlers.add(attribute.name);
				break;
			}
		}
	}

	for (const attribute of node.attributes) {
		if (attribute.type !== 'Attribute') continue;

		const name = attribute.name.toLowerCase();
		// aria-props
		if (name.startsWith('aria-')) {
			if (invisible_elements.includes(node.name)) {
				// aria-unsupported-elements
				w.a11y_aria_attributes(attribute, node.name);
			}

			const type = name.slice(5);
			if (!aria_attributes.includes(type)) {
				const match = fuzzymatch(type, aria_attributes);
				w.a11y_unknown_aria_attribute(attribute, type, match);
			}

			if (name === 'aria-hidden' && regex_heading_tags.test(node.name)) {
				w.a11y_hidden(attribute, node.name);
			}

			// aria-proptypes
			let value = get_static_value(attribute);

			const schema = aria.get(/** @type {ARIAProperty} */ (name));
			if (schema !== undefined) {
				validate_aria_attribute_value(attribute, /** @type {ARIAProperty} */ (name), schema, value);
			}

			// aria-activedescendant-has-tabindex
			if (
				name === 'aria-activedescendant' &&
				!is_dynamic_element &&
				!is_interactive_element(node.name, attribute_map) &&