219 lines
8.5 KiB
JavaScript
219 lines
8.5 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"] = void 0;
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var _jsxAstUtils = require("jsx-ast-utils");
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var _arrayPrototype = _interopRequireDefault(require("array.prototype.flatmap"));
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var _schemas = require("../util/schemas");
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var _getElementType = _interopRequireDefault(require("../util/getElementType"));
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var _hasAccessibleChild = _interopRequireDefault(require("../util/hasAccessibleChild"));
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var _isPresentationRole = _interopRequireDefault(require("../util/isPresentationRole"));
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/**
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* @fileoverview Enforce all elements that require alternative text have it.
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* @author Ethan Cohen
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*/
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// ----------------------------------------------------------------------------
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// Rule Definition
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// ----------------------------------------------------------------------------
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var DEFAULT_ELEMENTS = ['img', 'object', 'area', 'input[type="image"]'];
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var schema = (0, _schemas.generateObjSchema)({
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elements: _schemas.arraySchema,
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img: _schemas.arraySchema,
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object: _schemas.arraySchema,
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area: _schemas.arraySchema,
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'input[type="image"]': _schemas.arraySchema
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});
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var ariaLabelHasValue = function ariaLabelHasValue(prop) {
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var value = (0, _jsxAstUtils.getPropValue)(prop);
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if (value === undefined) {
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return false;
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}
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if (typeof value === 'string' && value.length === 0) {
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return false;
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}
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return true;
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};
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var ruleByElement = {
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img(context, node, nodeType) {
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var altProp = (0, _jsxAstUtils.getProp)(node.attributes, 'alt');
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// Missing alt prop error.
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if (altProp === undefined) {
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if ((0, _isPresentationRole["default"])(nodeType, node.attributes)) {
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context.report({
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node,
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message: 'Prefer alt="" over a presentational role. First rule of aria is to not use aria if it can be achieved via native HTML.'
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});
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return;
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}
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// Check for `aria-label` to provide text alternative
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// Don't create an error if the attribute is used correctly. But if it
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// isn't, suggest that the developer use `alt` instead.
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var ariaLabelProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-label');
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if (ariaLabelProp !== undefined) {
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if (!ariaLabelHasValue(ariaLabelProp)) {
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context.report({
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node,
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message: 'The aria-label attribute must have a value. The alt attribute is preferred over aria-label for images.'
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});
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}
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return;
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}
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// Check for `aria-labelledby` to provide text alternative
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// Don't create an error if the attribute is used correctly. But if it
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// isn't, suggest that the developer use `alt` instead.
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var ariaLabelledbyProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-labelledby');
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if (ariaLabelledbyProp !== undefined) {
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if (!ariaLabelHasValue(ariaLabelledbyProp)) {
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context.report({
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node,
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message: 'The aria-labelledby attribute must have a value. The alt attribute is preferred over aria-labelledby for images.'
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});
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}
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return;
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}
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context.report({
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node,
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message: "".concat(nodeType, " elements must have an alt prop, either with meaningful text, or an empty string for decorative images.")
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});
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return;
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}
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// Check if alt prop is undefined.
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var altValue = (0, _jsxAstUtils.getPropValue)(altProp);
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var isNullValued = altProp.value === null; // <img alt />
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if (altValue && !isNullValued || altValue === '') {
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return;
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}
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// Undefined alt prop error.
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context.report({
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node,
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message: "Invalid alt value for ".concat(nodeType, ". Use alt=\"\" for presentational images.")
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});
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},
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object(context, node, unusedNodeType, elementType) {
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var ariaLabelProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-label');
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var arialLabelledByProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-labelledby');
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var hasLabel = ariaLabelHasValue(ariaLabelProp) || ariaLabelHasValue(arialLabelledByProp);
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var titleProp = (0, _jsxAstUtils.getLiteralPropValue)((0, _jsxAstUtils.getProp)(node.attributes, 'title'));
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var hasTitleAttr = !!titleProp;
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if (hasLabel || hasTitleAttr || (0, _hasAccessibleChild["default"])(node.parent, elementType)) {
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return;
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}
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context.report({
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node,
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message: 'Embedded <object> elements must have alternative text by providing inner text, aria-label or aria-labelledby props.'
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});
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},
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area(context, node) {
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var ariaLabelProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-label');
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var arialLabelledByProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-labelledby');
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var hasLabel = ariaLabelHasValue(ariaLabelProp) || ariaLabelHasValue(arialLabelledByProp);
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if (hasLabel) {
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return;
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}
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var altProp = (0, _jsxAstUtils.getProp)(node.attributes, 'alt');
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if (altProp === undefined) {
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context.report({
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node,
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message: 'Each area of an image map must have a text alternative through the `alt`, `aria-label`, or `aria-labelledby` prop.'
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});
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return;
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}
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var altValue = (0, _jsxAstUtils.getPropValue)(altProp);
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var isNullValued = altProp.value === null; // <area alt />
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if (altValue && !isNullValued || altValue === '') {
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return;
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}
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context.report({
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node,
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message: 'Each area of an image map must have a text alternative through the `alt`, `aria-label`, or `aria-labelledby` prop.'
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});
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},
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'input[type="image"]': function inputImage(context, node, nodeType) {
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// Only test input[type="image"]
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if (nodeType === 'input') {
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var typePropValue = (0, _jsxAstUtils.getPropValue)((0, _jsxAstUtils.getProp)(node.attributes, 'type'));
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if (typePropValue !== 'image') {
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return;
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}
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}
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var ariaLabelProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-label');
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var arialLabelledByProp = (0, _jsxAstUtils.getProp)(node.attributes, 'aria-labelledby');
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var hasLabel = ariaLabelHasValue(ariaLabelProp) || ariaLabelHasValue(arialLabelledByProp);
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if (hasLabel) {
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return;
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}
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var altProp = (0, _jsxAstUtils.getProp)(node.attributes, 'alt');
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if (altProp === undefined) {
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context.report({
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node,
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message: '<input> elements with type="image" must have a text alternative through the `alt`, `aria-label`, or `aria-labelledby` prop.'
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});
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return;
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}
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var altValue = (0, _jsxAstUtils.getPropValue)(altProp);
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var isNullValued = altProp.value === null; // <area alt />
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if (altValue && !isNullValued || altValue === '') {
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return;
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}
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context.report({
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node,
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message: '<input> elements with type="image" must have a text alternative through the `alt`, `aria-label`, or `aria-labelledby` prop.'
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});
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}
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};
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var _default = {
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meta: {
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docs: {
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url: 'https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/tree/HEAD/docs/rules/alt-text.md',
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description: 'Enforce all elements that require alternative text have meaningful information to relay back to end user.'
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},
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schema: [schema]
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},
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create: function create(context) {
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var options = context.options[0] || {};
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// Elements to validate for alt text.
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var elementOptions = options.elements || DEFAULT_ELEMENTS;
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// Get custom components for just the elements that will be tested.
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var customComponents = (0, _arrayPrototype["default"])(elementOptions, function (element) {
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return options[element];
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});
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var typesToValidate = new Set([].concat(customComponents, elementOptions).map(function (type) {
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return type === 'input[type="image"]' ? 'input' : type;
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}));
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var elementType = (0, _getElementType["default"])(context);
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return {
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JSXOpeningElement(node) {
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var nodeType = elementType(node);
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if (!typesToValidate.has(nodeType)) {
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return;
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}
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var DOMElement = nodeType;
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if (DOMElement === 'input') {
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DOMElement = 'input[type="image"]';
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}
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// Map nodeType to the DOM element if we are running this on a custom component.
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if (elementOptions.indexOf(DOMElement) === -1) {
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DOMElement = elementOptions.find(function (element) {
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var customComponentsForElement = options[element] || [];
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return customComponentsForElement.indexOf(nodeType) > -1;
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});
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}
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ruleByElement[DOMElement](context, node, nodeType, elementType);
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}
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};
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}
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};
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exports["default"] = _default;
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module.exports = exports.default;
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