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node_modules/eslint-plugin-react/lib/util/jsx.js

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+/**
+ * @fileoverview Utility functions for JSX
+ */
+
+'use strict';
+
+const elementType = require('jsx-ast-utils/elementType');
+
+const COMPAT_TAG_REGEX = /^[a-z]|-/;
+
+/**
+ * Checks if a node represents a DOM element.
+ * @param {object} node - JSXOpeningElement to check.
+ * @returns {boolean} Whether or not the node corresponds to a DOM element.
+ */
+function isDOMComponent(node) {
+  let name = elementType(node);
+
+  // Get namespace if the type is JSXNamespacedName or JSXMemberExpression
+  if (name.indexOf(':') > -1) {
+    name = name.slice(0, name.indexOf(':'));
+  } else if (name.indexOf('.') > -1) {
+    name = name.slice(0, name.indexOf('.'));
+  }
+
+  return COMPAT_TAG_REGEX.test(name);
+}
+
+/**
+ * Test whether a JSXElement is a fragment
+ * @param {JSXElement} node
+ * @param {string} reactPragma
+ * @param {string} fragmentPragma
+ * @returns {boolean}
+ */
+function isFragment(node, reactPragma, fragmentPragma) {
+  const name = node.openingElement.name;
+
+  // <Fragment>
+  if (name.type === 'JSXIdentifier' && name.name === fragmentPragma) {
+    return true;
+  }
+
+  // <React.Fragment>
+  if (
+    name.type === 'JSXMemberExpression' &&
+    name.object.type === 'JSXIdentifier' &&
+    name.object.name === reactPragma &&
+    name.property.type === 'JSXIdentifier' &&
+    name.property.name === fragmentPragma
+  ) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Checks if a node represents a JSX element or fragment.
+ * @param {object} node - node to check.
+ * @returns {boolean} Whether or not the node if a JSX element or fragment.
+ */
+function isJSX(node) {
+  return node && ['JSXElement', 'JSXFragment'].indexOf(node.type) >= 0;
+}
+
+/**
+ * Check if node is like `key={...}` as in `<Foo key={...} />`
+ * @param {ASTNode} node
+ * @returns {boolean}
+ */
+function isJSXAttributeKey(node) {
+  return node.type === 'JSXAttribute' &&
+    node.name &&
+    node.name.type === 'JSXIdentifier' &&
+    node.name.name === 'key';
+}
+
+/**
+ * Check if value has only whitespaces
+ * @param {string} value
+ * @returns {boolean}
+ */
+function isWhiteSpaces(value) {
+  return typeof value === 'string' ? /^\s*$/.test(value) : false;
+}
+
+module.exports = {
+  isDOMComponent,
+  isFragment,
+  isJSX,
+  isJSXAttributeKey,
+  isWhiteSpaces
+};