/** * @fileoverview Prevent adjacent inline elements not separated by whitespace. * @author Sean Hayes */ 'use strict'; const docsUrl = require('../util/docsUrl'); const isCreateElement = require('../util/isCreateElement'); const report = require('../util/report'); // ------------------------------------------------------------------------------ // Helpers // ------------------------------------------------------------------------------ // https://developer.mozilla.org/en-US/docs/Web/HTML/Inline_elements const inlineNames = [ 'a', 'b', 'big', 'i', 'small', 'tt', 'abbr', 'acronym', 'cite', 'code', 'dfn', 'em', 'kbd', 'strong', 'samp', 'time', 'var', 'bdo', 'br', 'img', 'map', 'object', 'q', 'script', 'span', 'sub', 'sup', 'button', 'input', 'label', 'select', 'textarea', ]; // Note: raw   will be transformed into \u00a0. const whitespaceRegex = /(?:^\s|\s$)/; function isInline(node) { if (node.type === 'Literal') { // Regular whitespace will be removed. const value = node.value; // To properly separate inline elements, each end of the literal will need // whitespace. return !whitespaceRegex.test(value); } if (node.type === 'JSXElement' && inlineNames.indexOf(node.openingElement.name.name) > -1) { return true; } if (node.type === 'CallExpression' && inlineNames.indexOf(node.arguments[0].value) > -1) { return true; } return false; } // ------------------------------------------------------------------------------ // Rule Definition // ------------------------------------------------------------------------------ const messages = { inlineElement: 'Child elements which render as inline HTML elements should be separated by a space or wrapped in block level elements.', }; module.exports = { meta: { docs: { description: 'Prevent adjacent inline elements not separated by whitespace.', category: 'Best Practices', recommended: false, url: docsUrl('no-adjacent-inline-elements'), }, schema: [], messages, }, create(context) { function validate(node, children) { let currentIsInline = false; let previousIsInline = false; if (!children) { return; } for (let i = 0; i < children.length; i++) { currentIsInline = isInline(children[i]); if (previousIsInline && currentIsInline) { report(context, messages.inlineElement, 'inlineElement', { node, }); return; } previousIsInline = currentIsInline; } } return { JSXElement(node) { validate(node, node.children); }, CallExpression(node) { if (!isCreateElement(node, context)) { return; } if (node.arguments.length < 2 || !node.arguments[2]) { return; } const children = node.arguments[2].elements; validate(node, children); }, }; }, };