95 lines
2.2 KiB
JavaScript
95 lines
2.2 KiB
JavaScript
/**
|
|
* @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
|
|
};
|