Server IP : 150.95.80.236 / Your IP : 18.117.104.53 Web Server : Apache System : Linux host-150-95-80-236 3.10.0-1160.105.1.el7.x86_64 #1 SMP Thu Dec 7 15:39:45 UTC 2023 x86_64 User : social-telecare ( 10000) PHP Version : 7.4.33 Disable Function : opcache_get_status MySQL : OFF | cURL : ON | WGET : OFF | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : /var/www/vhosts/pcu.in.th/api-uat.pcu.in.th/node_modules/eslint/lib/rules/ |
Upload File : |
/** * @fileoverview disallow unnecessary concatenation of template strings * @author Henry Zhu */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Checks whether or not a given node is a concatenation. * @param {ASTNode} node A node to check. * @returns {boolean} `true` if the node is a concatenation. */ function isConcatenation(node) { return node.type === "BinaryExpression" && node.operator === "+"; } /** * Checks if the given token is a `+` token or not. * @param {Token} token The token to check. * @returns {boolean} `true` if the token is a `+` token. */ function isConcatOperatorToken(token) { return token.value === "+" && token.type === "Punctuator"; } /** * Get's the right most node on the left side of a BinaryExpression with + operator. * @param {ASTNode} node A BinaryExpression node to check. * @returns {ASTNode} node */ function getLeft(node) { let left = node.left; while (isConcatenation(left)) { left = left.right; } return left; } /** * Get's the left most node on the right side of a BinaryExpression with + operator. * @param {ASTNode} node A BinaryExpression node to check. * @returns {ASTNode} node */ function getRight(node) { let right = node.right; while (isConcatenation(right)) { right = right.left; } return right; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow unnecessary concatenation of literals or template literals", recommended: false, url: "https://eslint.org/docs/latest/rules/no-useless-concat" }, schema: [], messages: { unexpectedConcat: "Unexpected string concatenation of literals." } }, create(context) { const sourceCode = context.sourceCode; return { BinaryExpression(node) { // check if not concatenation if (node.operator !== "+") { return; } // account for the `foo + "a" + "b"` case const left = getLeft(node); const right = getRight(node); if (astUtils.isStringLiteral(left) && astUtils.isStringLiteral(right) && astUtils.isTokenOnSameLine(left, right) ) { const operatorToken = sourceCode.getFirstTokenBetween(left, right, isConcatOperatorToken); context.report({ node, loc: operatorToken.loc, messageId: "unexpectedConcat" }); } } }; } };