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jsx.js
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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;
}
module.exports = {
isDOMComponent: isDOMComponent,
isFragment,
isJSX: isJSX
};