55 lines
2.2 KiB
JavaScript
55 lines
2.2 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports["default"] = getAccessibleChildText;
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var _jsxAstUtils = require("jsx-ast-utils");
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var _isHiddenFromScreenReader = _interopRequireDefault(require("./isHiddenFromScreenReader"));
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function _interopRequireDefault(e) { return e && e.__esModule ? e : { "default": e }; }
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/**
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* Returns a new "standardized" string: all whitespace is collapsed to one space,
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* and the string is lowercase
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* @param {string} input
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* @returns lowercase, single-spaced, punctuation-stripped, trimmed string
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*/
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function standardizeSpaceAndCase(input) {
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return input.trim().replace(/[,.?¿!‽¡;:]/g, '') // strip punctuation
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.replace(/\s\s+/g, ' ') // collapse spaces
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.toLowerCase();
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}
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/**
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* Returns the (recursively-defined) accessible child text of a node, which (in-order) is:
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* 1. The element's aria-label
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* 2. If the element is a direct literal, the literal value
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* 3. Otherwise, merge all of its children
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* @param {JSXElement} node - node to traverse
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* @returns child text as a string
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*/
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function getAccessibleChildText(node, elementType) {
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var ariaLabel = (0, _jsxAstUtils.getLiteralPropValue)((0, _jsxAstUtils.getProp)(node.openingElement.attributes, 'aria-label'));
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// early escape-hatch when aria-label is applied
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if (ariaLabel) return standardizeSpaceAndCase(ariaLabel);
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// early-return if alt prop exists and is an image
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var altTag = (0, _jsxAstUtils.getLiteralPropValue)((0, _jsxAstUtils.getProp)(node.openingElement.attributes, 'alt'));
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if (elementType(node.openingElement) === 'img' && altTag) return standardizeSpaceAndCase(altTag);
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// skip if aria-hidden is true
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if ((0, _isHiddenFromScreenReader["default"])(elementType(node.openingElement), node.openingElement.attributes)) {
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return '';
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}
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var rawChildText = node.children.map(function (currentNode) {
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// $FlowFixMe JSXText is missing in ast-types-flow
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if (currentNode.type === 'Literal' || currentNode.type === 'JSXText') {
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return String(currentNode.value);
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}
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if (currentNode.type === 'JSXElement') {
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return getAccessibleChildText(currentNode, elementType);
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}
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return '';
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}).join(' ');
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return standardizeSpaceAndCase(rawChildText);
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}
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module.exports = exports.default;
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