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node_modules/eslint-plugin-jsx-a11y/lib/rules/lang.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+var _jsxAstUtils = require("jsx-ast-utils");
+
+var _schemas = require("../util/schemas");
+
+var _ISO = _interopRequireDefault(require("../util/attributes/ISO.json"));
+
+/**
+ * @fileoverview Enforce lang attribute has a valid value.
+ * @author Ethan Cohen
+ */
+// ----------------------------------------------------------------------------
+// Rule Definition
+// ----------------------------------------------------------------------------
+var errorMessage = 'lang attribute must have a valid value.';
+var schema = (0, _schemas.generateObjSchema)();
+module.exports = {
+  meta: {
+    docs: {
+      url: 'https://github.com/evcohen/eslint-plugin-jsx-a11y/tree/master/docs/rules/lang.md'
+    },
+    schema: [schema]
+  },
+  create: function create(context) {
+    return {
+      JSXAttribute: function JSXAttribute(node) {
+        var name = (0, _jsxAstUtils.propName)(node);
+
+        if (name && name.toUpperCase() !== 'LANG') {
+          return;
+        }
+
+        var parent = node.parent;
+        var type = (0, _jsxAstUtils.elementType)(parent);
+
+        if (type && type !== 'html') {
+          return;
+        }
+
+        var value = (0, _jsxAstUtils.getLiteralPropValue)(node); // Don't check identifiers
+
+        if (value === null) {
+          return;
+        }
+
+        if (value === undefined) {
+          context.report({
+            node,
+            message: errorMessage
+          });
+          return;
+        }
+
+        var hyphen = value.indexOf('-');
+        var lang = hyphen > -1 ? value.substring(0, hyphen) : value;
+        var country = hyphen > -1 ? value.substring(3) : undefined;
+
+        if (_ISO["default"].languages.indexOf(lang) > -1 && (country === undefined || _ISO["default"].countries.indexOf(country) > -1)) {
+          return;
+        }
+
+        context.report({
+          node,
+          message: errorMessage
+        });
+      }
+    };
+  }
+};