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/** * @fileoverview Rule to flag use of comma operator * @author Brandon Mills */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const DEFAULT_OPTIONS = { allowInParentheses: true }; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow comma operators", recommended: false, url: "https://eslint.org/docs/latest/rules/no-sequences" }, schema: [{ properties: { allowInParentheses: { type: "boolean", default: true } }, additionalProperties: false }], messages: { unexpectedCommaExpression: "Unexpected use of comma operator." } }, create(context) { const options = Object.assign({}, DEFAULT_OPTIONS, context.options[0]); const sourceCode = context.sourceCode; /** * Parts of the grammar that are required to have parens. */ const parenthesized = { DoWhileStatement: "test", IfStatement: "test", SwitchStatement: "discriminant", WhileStatement: "test", WithStatement: "object", ArrowFunctionExpression: "body" /* * Omitting CallExpression - commas are parsed as argument separators * Omitting NewExpression - commas are parsed as argument separators * Omitting ForInStatement - parts aren't individually parenthesised * Omitting ForStatement - parts aren't individually parenthesised */ }; /** * Determines whether a node is required by the grammar to be wrapped in * parens, e.g. the test of an if statement. * @param {ASTNode} node The AST node * @returns {boolean} True if parens around node belong to parent node. */ function requiresExtraParens(node) { return node.parent && parenthesized[node.parent.type] && node === node.parent[parenthesized[node.parent.type]]; } /** * Check if a node is wrapped in parens. * @param {ASTNode} node The AST node * @returns {boolean} True if the node has a paren on each side. */ function isParenthesised(node) { return astUtils.isParenthesised(sourceCode, node); } /** * Check if a node is wrapped in two levels of parens. * @param {ASTNode} node The AST node * @returns {boolean} True if two parens surround the node on each side. */ function isParenthesisedTwice(node) { const previousToken = sourceCode.getTokenBefore(node, 1), nextToken = sourceCode.getTokenAfter(node, 1); return isParenthesised(node) && previousToken && nextToken && astUtils.isOpeningParenToken(previousToken) && previousToken.range[1] <= node.range[0] && astUtils.isClosingParenToken(nextToken) && nextToken.range[0] >= node.range[1]; } return { SequenceExpression(node) { // Always allow sequences in for statement update if (node.parent.type === "ForStatement" && (node === node.parent.init || node === node.parent.update)) { return; } // Wrapping a sequence in extra parens indicates intent if (options.allowInParentheses) { if (requiresExtraParens(node)) { if (isParenthesisedTwice(node)) { return; } } else { if (isParenthesised(node)) { return; } } } const firstCommaToken = sourceCode.getTokenAfter(node.expressions[0], astUtils.isCommaToken); context.report({ node, loc: firstCommaToken.loc, messageId: "unexpectedCommaExpression" }); } }; } };