react-kiwi-dropdown
Version:
A minimal, easy-to-use and highly adjustable dropdown component made with ReactJS.
86 lines (76 loc) • 4.54 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = mayHaveAccessibleLabel;
var _arrayIncludes = require('array-includes');
var _arrayIncludes2 = _interopRequireDefault(_arrayIncludes);
var _jsxAstUtils = require('jsx-ast-utils');
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } } /**
* Returns true if a labelling element is found or if it cannot determine if
* a label is present because of expression containers or spread attributes.
* A false return value means that the node definitely does not have a label,
* but a true return return value means that the node may or may not have a
* label.
*
*
*/
function hasLabellingProp(openingElement) {
var additionalLabellingProps = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
var labellingProps = ['alt', // Assume alt is used correctly on an image
'aria-label', 'aria-labelledby'].concat(_toConsumableArray(additionalLabellingProps));
return openingElement.attributes.some(function (attribute) {
// We must assume that a spread value contains a labelling prop.
if (attribute.type !== 'JSXAttribute') {
return true;
}
// Attribute matches.
if ((0, _arrayIncludes2.default)(labellingProps, (0, _jsxAstUtils.propName)(attribute)) && !!(0, _jsxAstUtils.getPropValue)(attribute)) {
return true;
}
return false;
});
}
function mayHaveAccessibleLabel(root) {
var maxDepth = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var additionalLabellingProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [];
function checkElement(node, depth) {
// Bail when maxDepth is exceeded.
if (depth > maxDepth) {
return false;
}
// Check for literal text.
if (node.type === 'Literal' && !!node.value) {
return true;
}
// Assume an expression container renders a label. It is the best we can
// do in this case.
if (node.type === 'JSXExpressionContainer') {
return true;
}
// Check for JSXText.
// $FlowFixMe Remove after updating ast-types-flow
if (node.type === 'JSXText' && !!node.value) {
return true;
}
// Check for labelling props.
if (node.openingElement
/* $FlowFixMe */
&& hasLabellingProp(node.openingElement, additionalLabellingProps)) {
return true;
}
// Recurse into the child element nodes.
if (node.children) {
/* $FlowFixMe */
for (var i = 0; i < node.children.length; i += 1) {
/* $FlowFixMe */
if (checkElement(node.children[i], depth + 1)) {
return true;
}
}
}
return false;
}
return checkElement(root, 0);
}