validate_aria_attribute_value() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js lines 893–965

function validate_aria_attribute_value(attribute, name, schema, value) {
	const type = schema.type;

	if (value === null) return;
	if (value === true) value = '';

	switch (type) {
		case 'id':
		case 'string': {
			if (value === '') {
				w.a11y_incorrect_aria_attribute_type(attribute, name, 'non-empty string');
			}
			break;
		}
		case 'number': {
			if (value === '' || isNaN(+value)) {
				w.a11y_incorrect_aria_attribute_type(attribute, name, 'number');
			}
			break;
		}
		case 'boolean': {
			if (value !== 'true' && value !== 'false') {
				w.a11y_incorrect_aria_attribute_type_boolean(attribute, name);
			}
			break;
		}
		case 'idlist': {
			if (value === '') {
				w.a11y_incorrect_aria_attribute_type_idlist(attribute, name);
			}
			break;
		}
		case 'integer': {
			if (value === '' || !Number.isInteger(+value)) {
				w.a11y_incorrect_aria_attribute_type_integer(attribute, name);
			}
			break;
		}
		case 'token': {
			const values = (schema.values ?? []).map((value) => value.toString());
			if (!values.includes(value.toLowerCase())) {
				w.a11y_incorrect_aria_attribute_type_token(
					attribute,
					name,
					list(values.map((v) => `"${v}"`))
				);
			}
			break;
		}
		case 'tokenlist': {
			const values = (schema.values ?? []).map((value) => value.toString());
			if (
				value
					.toLowerCase()
					.split(regex_whitespaces)
					.some((value) => !values.includes(value))
			) {
				w.a11y_incorrect_aria_attribute_type_tokenlist(
					attribute,
					name,
					list(values.map((v) => `"${v}"`))
				);
			}
			break;
		}
		case 'tristate': {
			if (value !== 'true' && value !== 'false' && value !== 'mixed') {
				w.a11y_incorrect_aria_attribute_type_tristate(attribute, name);
			}
			break;
		}
	}
}