93 lines
2.8 KiB
JavaScript
93 lines
2.8 KiB
JavaScript
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"use strict";
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var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports["default"] = mayHaveAccessibleLabel;
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var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray"));
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var _arrayIncludes = _interopRequireDefault(require("array-includes"));
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var _jsxAstUtils = require("jsx-ast-utils");
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/**
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* Returns true if a labelling element is found or if it cannot determine if
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* a label is present because of expression containers or spread attributes.
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* A false return value means that the node definitely does not have a label,
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* but a true return return value means that the node may or may not have a
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* label.
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*
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*
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*/
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function hasLabellingProp(openingElement) {
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var additionalLabellingProps = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
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var labellingProps = ['alt', // Assume alt is used correctly on an image
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'aria-label', 'aria-labelledby'].concat((0, _toConsumableArray2["default"])(additionalLabellingProps));
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return openingElement.attributes.some(function (attribute) {
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// We must assume that a spread value contains a labelling prop.
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if (attribute.type !== 'JSXAttribute') {
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return true;
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} // Attribute matches.
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if ((0, _arrayIncludes["default"])(labellingProps, (0, _jsxAstUtils.propName)(attribute)) && !!(0, _jsxAstUtils.getPropValue)(attribute)) {
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return true;
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}
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return false;
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});
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}
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function mayHaveAccessibleLabel(root) {
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var maxDepth = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
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var additionalLabellingProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [];
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function checkElement(node, depth) {
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// Bail when maxDepth is exceeded.
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if (depth > maxDepth) {
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return false;
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} // Check for literal text.
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if (node.type === 'Literal' && !!node.value) {
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return true;
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} // Assume an expression container renders a label. It is the best we can
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// do in this case.
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if (node.type === 'JSXExpressionContainer') {
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return true;
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} // Check for JSXText.
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// $FlowFixMe Remove after updating ast-types-flow
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if (node.type === 'JSXText' && !!node.value) {
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return true;
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} // Check for labelling props.
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if (node.openingElement
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/* $FlowFixMe */
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&& hasLabellingProp(node.openingElement, additionalLabellingProps)) {
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return true;
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} // Recurse into the child element nodes.
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if (node.children) {
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/* $FlowFixMe */
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for (var i = 0; i < node.children.length; i += 1) {
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/* $FlowFixMe */
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if (checkElement(node.children[i], depth + 1)) {
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return true;
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}
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}
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}
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return false;
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}
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return checkElement(root, 0);
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}
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