/**
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* @fileoverview Disallow parenthesising higher precedence subexpressions.
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* @author Michael Ficarra
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils.js");
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "disallow unnecessary parentheses",
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category: "Possible Errors",
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recommended: false,
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url: "https://eslint.org/docs/rules/no-extra-parens"
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},
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fixable: "code",
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schema: {
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anyOf: [
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{
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type: "array",
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items: [
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{
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enum: ["functions"]
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}
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],
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minItems: 0,
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maxItems: 1
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},
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{
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type: "array",
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items: [
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{
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enum: ["all"]
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},
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{
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type: "object",
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properties: {
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conditionalAssign: { type: "boolean" },
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nestedBinaryExpressions: { type: "boolean" },
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returnAssign: { type: "boolean" },
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ignoreJSX: { enum: ["none", "all", "single-line", "multi-line"] },
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enforceForArrowConditionals: { type: "boolean" }
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},
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additionalProperties: false
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}
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],
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minItems: 0,
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maxItems: 2
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}
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]
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},
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messages: {
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unexpected: "Unnecessary parentheses around expression."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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const tokensToIgnore = new WeakSet();
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const isParenthesised = astUtils.isParenthesised.bind(astUtils, sourceCode);
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const precedence = astUtils.getPrecedence;
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const ALL_NODES = context.options[0] !== "functions";
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const EXCEPT_COND_ASSIGN = ALL_NODES && context.options[1] && context.options[1].conditionalAssign === false;
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const NESTED_BINARY = ALL_NODES && context.options[1] && context.options[1].nestedBinaryExpressions === false;
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const EXCEPT_RETURN_ASSIGN = ALL_NODES && context.options[1] && context.options[1].returnAssign === false;
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const IGNORE_JSX = ALL_NODES && context.options[1] && context.options[1].ignoreJSX;
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const IGNORE_ARROW_CONDITIONALS = ALL_NODES && context.options[1] &&
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context.options[1].enforceForArrowConditionals === false;
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const PRECEDENCE_OF_ASSIGNMENT_EXPR = precedence({ type: "AssignmentExpression" });
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const PRECEDENCE_OF_UPDATE_EXPR = precedence({ type: "UpdateExpression" });
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/**
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* Determines if this rule should be enforced for a node given the current configuration.
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the rule should be enforced for this node.
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* @private
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*/
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function ruleApplies(node) {
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if (node.type === "JSXElement" || node.type === "JSXFragment") {
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const isSingleLine = node.loc.start.line === node.loc.end.line;
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switch (IGNORE_JSX) {
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// Exclude this JSX element from linting
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case "all":
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return false;
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// Exclude this JSX element if it is multi-line element
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case "multi-line":
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return isSingleLine;
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// Exclude this JSX element if it is single-line element
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case "single-line":
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return !isSingleLine;
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// Nothing special to be done for JSX elements
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case "none":
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break;
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// no default
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}
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}
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return ALL_NODES || node.type === "FunctionExpression" || node.type === "ArrowFunctionExpression";
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}
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/**
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* Determines if a node is surrounded by parentheses twice.
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is doubly parenthesised.
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* @private
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*/
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function isParenthesisedTwice(node) {
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const previousToken = sourceCode.getTokenBefore(node, 1),
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nextToken = sourceCode.getTokenAfter(node, 1);
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return isParenthesised(node) && previousToken && nextToken &&
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astUtils.isOpeningParenToken(previousToken) && previousToken.range[1] <= node.range[0] &&
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astUtils.isClosingParenToken(nextToken) && nextToken.range[0] >= node.range[1];
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}
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/**
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* Determines if a node is surrounded by (potentially) invalid parentheses.
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is incorrectly parenthesised.
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* @private
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*/
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function hasExcessParens(node) {
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return ruleApplies(node) && isParenthesised(node);
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}
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/**
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* Determines if a node that is expected to be parenthesised is surrounded by
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* (potentially) invalid extra parentheses.
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is has an unexpected extra pair of parentheses.
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* @private
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*/
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function hasDoubleExcessParens(node) {
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return ruleApplies(node) && isParenthesisedTwice(node);
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}
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/**
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* Determines if a node test expression is allowed to have a parenthesised assignment
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the assignment can be parenthesised.
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* @private
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*/
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function isCondAssignException(node) {
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return EXCEPT_COND_ASSIGN && node.test.type === "AssignmentExpression";
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}
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/**
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* Determines if a node is in a return statement
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is in a return statement.
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* @private
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*/
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function isInReturnStatement(node) {
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for (let currentNode = node; currentNode; currentNode = currentNode.parent) {
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if (
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currentNode.type === "ReturnStatement" ||
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(currentNode.type === "ArrowFunctionExpression" && currentNode.body.type !== "BlockStatement")
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) {
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return true;
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}
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}
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return false;
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}
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/**
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* Determines if a constructor function is newed-up with parens
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* @param {ASTNode} newExpression - The NewExpression node to be checked.
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* @returns {boolean} True if the constructor is called with parens.
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* @private
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*/
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function isNewExpressionWithParens(newExpression) {
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const lastToken = sourceCode.getLastToken(newExpression);
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const penultimateToken = sourceCode.getTokenBefore(lastToken);
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return newExpression.arguments.length > 0 || astUtils.isOpeningParenToken(penultimateToken) && astUtils.isClosingParenToken(lastToken);
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}
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/**
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* Determines if a node is or contains an assignment expression
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is or contains an assignment expression.
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* @private
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*/
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function containsAssignment(node) {
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if (node.type === "AssignmentExpression") {
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return true;
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}
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if (node.type === "ConditionalExpression" &&
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(node.consequent.type === "AssignmentExpression" || node.alternate.type === "AssignmentExpression")) {
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return true;
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}
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if ((node.left && node.left.type === "AssignmentExpression") ||
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(node.right && node.right.type === "AssignmentExpression")) {
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return true;
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}
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return false;
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}
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/**
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* Determines if a node is contained by or is itself a return statement and is allowed to have a parenthesised assignment
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the assignment can be parenthesised.
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* @private
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*/
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function isReturnAssignException(node) {
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if (!EXCEPT_RETURN_ASSIGN || !isInReturnStatement(node)) {
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return false;
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}
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if (node.type === "ReturnStatement") {
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return node.argument && containsAssignment(node.argument);
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}
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if (node.type === "ArrowFunctionExpression" && node.body.type !== "BlockStatement") {
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return containsAssignment(node.body);
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}
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return containsAssignment(node);
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}
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/**
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* Determines if a node following a [no LineTerminator here] restriction is
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* surrounded by (potentially) invalid extra parentheses.
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* @param {Token} token - The token preceding the [no LineTerminator here] restriction.
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* @param {ASTNode} node - The node to be checked.
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* @returns {boolean} True if the node is incorrectly parenthesised.
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* @private
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*/
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function hasExcessParensNoLineTerminator(token, node) {
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if (token.loc.end.line === node.loc.start.line) {
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return hasExcessParens(node);
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}
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return hasDoubleExcessParens(node);
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}
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/**
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* Determines whether a node should be preceded by an additional space when removing parens
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* @param {ASTNode} node node to evaluate; must be surrounded by parentheses
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* @returns {boolean} `true` if a space should be inserted before the node
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* @private
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*/
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function requiresLeadingSpace(node) {
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const leftParenToken = sourceCode.getTokenBefore(node);
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const tokenBeforeLeftParen = sourceCode.getTokenBefore(node, 1);
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const firstToken = sourceCode.getFirstToken(node);
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return tokenBeforeLeftParen &&
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tokenBeforeLeftParen.range[1] === leftParenToken.range[0] &&
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leftParenToken.range[1] === firstToken.range[0] &&
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!astUtils.canTokensBeAdjacent(tokenBeforeLeftParen, firstToken);
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}
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/**
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* Determines whether a node should be followed by an additional space when removing parens
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* @param {ASTNode} node node to evaluate; must be surrounded by parentheses
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* @returns {boolean} `true` if a space should be inserted after the node
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* @private
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*/
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function requiresTrailingSpace(node) {
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const nextTwoTokens = sourceCode.getTokensAfter(node, { count: 2 });
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const rightParenToken = nextTwoTokens[0];
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const tokenAfterRightParen = nextTwoTokens[1];
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const tokenBeforeRightParen = sourceCode.getLastToken(node);
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return rightParenToken && tokenAfterRightParen &&
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!sourceCode.isSpaceBetweenTokens(rightParenToken, tokenAfterRightParen) &&
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!astUtils.canTokensBeAdjacent(tokenBeforeRightParen, tokenAfterRightParen);
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}
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/**
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* Determines if a given expression node is an IIFE
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* @param {ASTNode} node The node to check
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* @returns {boolean} `true` if the given node is an IIFE
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*/
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function isIIFE(node) {
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return node.type === "CallExpression" && node.callee.type === "FunctionExpression";
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}
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/**
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* Report the node
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* @param {ASTNode} node node to evaluate
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* @returns {void}
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* @private
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*/
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function report(node) {
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const leftParenToken = sourceCode.getTokenBefore(node);
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const rightParenToken = sourceCode.getTokenAfter(node);
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if (!isParenthesisedTwice(node)) {
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if (tokensToIgnore.has(sourceCode.getFirstToken(node))) {
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return;
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}
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if (isIIFE(node) && !isParenthesised(node.callee)) {
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return;
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}
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}
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context.report({
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node,
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loc: leftParenToken.loc.start,
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messageId: "unexpected",
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fix(fixer) {
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const parenthesizedSource = sourceCode.text.slice(leftParenToken.range[1], rightParenToken.range[0]);
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return fixer.replaceTextRange([
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leftParenToken.range[0],
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rightParenToken.range[1]
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], (requiresLeadingSpace(node) ? " " : "") + parenthesizedSource + (requiresTrailingSpace(node) ? " " : ""));
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}
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});
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}
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/**
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* Evaluate Unary update
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* @param {ASTNode} node node to evaluate
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* @returns {void}
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* @private
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*/
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function checkUnaryUpdate(node) {
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if (node.type === "UnaryExpression" && node.argument.type === "BinaryExpression" && node.argument.operator === "**") {
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return;
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}
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if (hasExcessParens(node.argument) && precedence(node.argument) >= precedence(node)) {
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report(node.argument);
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}
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}
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/**
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* Check if a member expression contains a call expression
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* @param {ASTNode} node MemberExpression node to evaluate
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* @returns {boolean} true if found, false if not
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*/
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function doesMemberExpressionContainCallExpression(node) {
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let currentNode = node.object;
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let currentNodeType = node.object.type;
|
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while (currentNodeType === "MemberExpression") {
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currentNode = currentNode.object;
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currentNodeType = currentNode.type;
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}
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return currentNodeType === "CallExpression";
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}
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/**
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* Evaluate a new call
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* @param {ASTNode} node node to evaluate
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* @returns {void}
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* @private
|
*/
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function checkCallNew(node) {
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const callee = node.callee;
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if (hasExcessParens(callee) && precedence(callee) >= precedence(node)) {
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const hasNewParensException = callee.type === "NewExpression" && !isNewExpressionWithParens(callee);
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if (
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hasDoubleExcessParens(callee) ||
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!isIIFE(node) && !hasNewParensException && !(
|
|
/*
|
* Allow extra parens around a new expression if
|
* there are intervening parentheses.
|
*/
|
(callee.type === "MemberExpression" && doesMemberExpressionContainCallExpression(callee))
|
)
|
) {
|
report(node.callee);
|
}
|
}
|
if (node.arguments.length === 1) {
|
if (hasDoubleExcessParens(node.arguments[0]) && precedence(node.arguments[0]) >= PRECEDENCE_OF_ASSIGNMENT_EXPR) {
|
report(node.arguments[0]);
|
}
|
} else {
|
node.arguments
|
.filter(arg => hasExcessParens(arg) && precedence(arg) >= PRECEDENCE_OF_ASSIGNMENT_EXPR)
|
.forEach(report);
|
}
|
}
|
|
/**
|
* Evaluate binary logicals
|
* @param {ASTNode} node node to evaluate
|
* @returns {void}
|
* @private
|
*/
|
function checkBinaryLogical(node) {
|
const prec = precedence(node);
|
const leftPrecedence = precedence(node.left);
|
const rightPrecedence = precedence(node.right);
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const isExponentiation = node.operator === "**";
|
const shouldSkipLeft = (NESTED_BINARY && (node.left.type === "BinaryExpression" || node.left.type === "LogicalExpression")) ||
|
node.left.type === "UnaryExpression" && isExponentiation;
|
const shouldSkipRight = NESTED_BINARY && (node.right.type === "BinaryExpression" || node.right.type === "LogicalExpression");
|
|
if (!shouldSkipLeft && hasExcessParens(node.left) && (leftPrecedence > prec || (leftPrecedence === prec && !isExponentiation))) {
|
report(node.left);
|
}
|
if (!shouldSkipRight && hasExcessParens(node.right) && (rightPrecedence > prec || (rightPrecedence === prec && isExponentiation))) {
|
report(node.right);
|
}
|
}
|
|
/**
|
* Check the parentheses around the super class of the given class definition.
|
* @param {ASTNode} node The node of class declarations to check.
|
* @returns {void}
|
*/
|
function checkClass(node) {
|
if (!node.superClass) {
|
return;
|
}
|
|
/*
|
* If `node.superClass` is a LeftHandSideExpression, parentheses are extra.
|
* Otherwise, parentheses are needed.
|
*/
|
const hasExtraParens = precedence(node.superClass) > PRECEDENCE_OF_UPDATE_EXPR
|
? hasExcessParens(node.superClass)
|
: hasDoubleExcessParens(node.superClass);
|
|
if (hasExtraParens) {
|
report(node.superClass);
|
}
|
}
|
|
/**
|
* Check the parentheses around the argument of the given spread operator.
|
* @param {ASTNode} node The node of spread elements/properties to check.
|
* @returns {void}
|
*/
|
function checkSpreadOperator(node) {
|
const hasExtraParens = precedence(node.argument) >= PRECEDENCE_OF_ASSIGNMENT_EXPR
|
? hasExcessParens(node.argument)
|
: hasDoubleExcessParens(node.argument);
|
|
if (hasExtraParens) {
|
report(node.argument);
|
}
|
}
|
|
/**
|
* Checks the parentheses for an ExpressionStatement or ExportDefaultDeclaration
|
* @param {ASTNode} node The ExpressionStatement.expression or ExportDefaultDeclaration.declaration node
|
* @returns {void}
|
*/
|
function checkExpressionOrExportStatement(node) {
|
const firstToken = isParenthesised(node) ? sourceCode.getTokenBefore(node) : sourceCode.getFirstToken(node);
|
const secondToken = sourceCode.getTokenAfter(firstToken, astUtils.isNotOpeningParenToken);
|
const thirdToken = secondToken ? sourceCode.getTokenAfter(secondToken) : null;
|
const tokenAfterClosingParens = secondToken ? sourceCode.getTokenAfter(secondToken, astUtils.isNotClosingParenToken) : null;
|
|
if (
|
astUtils.isOpeningParenToken(firstToken) &&
|
(
|
astUtils.isOpeningBraceToken(secondToken) ||
|
secondToken.type === "Keyword" && (
|
secondToken.value === "function" ||
|
secondToken.value === "class" ||
|
secondToken.value === "let" &&
|
tokenAfterClosingParens &&
|
(
|
astUtils.isOpeningBracketToken(tokenAfterClosingParens) ||
|
tokenAfterClosingParens.type === "Identifier"
|
)
|
) ||
|
secondToken && secondToken.type === "Identifier" && secondToken.value === "async" && thirdToken && thirdToken.type === "Keyword" && thirdToken.value === "function"
|
)
|
) {
|
tokensToIgnore.add(secondToken);
|
}
|
|
if (hasExcessParens(node)) {
|
report(node);
|
}
|
}
|
|
return {
|
ArrayExpression(node) {
|
node.elements
|
.filter(e => e && hasExcessParens(e) && precedence(e) >= PRECEDENCE_OF_ASSIGNMENT_EXPR)
|
.forEach(report);
|
},
|
|
ArrowFunctionExpression(node) {
|
if (isReturnAssignException(node)) {
|
return;
|
}
|
|
if (node.body.type === "ConditionalExpression" &&
|
IGNORE_ARROW_CONDITIONALS &&
|
!isParenthesisedTwice(node.body)
|
) {
|
return;
|
}
|
|
if (node.body.type !== "BlockStatement") {
|
const firstBodyToken = sourceCode.getFirstToken(node.body, astUtils.isNotOpeningParenToken);
|
const tokenBeforeFirst = sourceCode.getTokenBefore(firstBodyToken);
|
|
if (astUtils.isOpeningParenToken(tokenBeforeFirst) && astUtils.isOpeningBraceToken(firstBodyToken)) {
|
tokensToIgnore.add(firstBodyToken);
|
}
|
if (hasExcessParens(node.body) && precedence(node.body) >= PRECEDENCE_OF_ASSIGNMENT_EXPR) {
|
report(node.body);
|
}
|
}
|
},
|
|
AssignmentExpression(node) {
|
if (isReturnAssignException(node)) {
|
return;
|
}
|
|
if (hasExcessParens(node.right) && precedence(node.right) >= precedence(node)) {
|
report(node.right);
|
}
|
},
|
|
BinaryExpression: checkBinaryLogical,
|
CallExpression: checkCallNew,
|
|
ConditionalExpression(node) {
|
if (isReturnAssignException(node)) {
|
return;
|
}
|
|
if (hasExcessParens(node.test) && precedence(node.test) >= precedence({ type: "LogicalExpression", operator: "||" })) {
|
report(node.test);
|
}
|
|
if (hasExcessParens(node.consequent) && precedence(node.consequent) >= PRECEDENCE_OF_ASSIGNMENT_EXPR) {
|
report(node.consequent);
|
}
|
|
if (hasExcessParens(node.alternate) && precedence(node.alternate) >= PRECEDENCE_OF_ASSIGNMENT_EXPR) {
|
report(node.alternate);
|
}
|
},
|
|
DoWhileStatement(node) {
|
if (hasDoubleExcessParens(node.test) && !isCondAssignException(node)) {
|
report(node.test);
|
}
|
},
|
|
ExportDefaultDeclaration: node => checkExpressionOrExportStatement(node.declaration),
|
ExpressionStatement: node => checkExpressionOrExportStatement(node.expression),
|
|
"ForInStatement, ForOfStatement"(node) {
|
if (node.left.type !== "VariableDeclarator") {
|
const firstLeftToken = sourceCode.getFirstToken(node.left, astUtils.isNotOpeningParenToken);
|
|
if (
|
firstLeftToken.value === "let" && (
|
|
/*
|
* If `let` is the only thing on the left side of the loop, it's the loop variable: `for ((let) of foo);`
|
* Removing it will cause a syntax error, because it will be parsed as the start of a VariableDeclarator.
|
*/
|
(firstLeftToken.range[1] === node.left.range[1] || /*
|
* If `let` is followed by a `[` token, it's a property access on the `let` value: `for ((let[foo]) of bar);`
|
* Removing it will cause the property access to be parsed as a destructuring declaration of `foo` instead.
|
*/
|
astUtils.isOpeningBracketToken(
|
sourceCode.getTokenAfter(firstLeftToken, astUtils.isNotClosingParenToken)
|
))
|
)
|
) {
|
tokensToIgnore.add(firstLeftToken);
|
}
|
}
|
if (!(node.type === "ForOfStatement" && node.right.type === "SequenceExpression") && hasExcessParens(node.right)) {
|
report(node.right);
|
}
|
if (hasExcessParens(node.left)) {
|
report(node.left);
|
}
|
},
|
|
ForStatement(node) {
|
if (node.init && hasExcessParens(node.init)) {
|
report(node.init);
|
}
|
|
if (node.test && hasExcessParens(node.test) && !isCondAssignException(node)) {
|
report(node.test);
|
}
|
|
if (node.update && hasExcessParens(node.update)) {
|
report(node.update);
|
}
|
},
|
|
IfStatement(node) {
|
if (hasDoubleExcessParens(node.test) && !isCondAssignException(node)) {
|
report(node.test);
|
}
|
},
|
|
LogicalExpression: checkBinaryLogical,
|
|
MemberExpression(node) {
|
const nodeObjHasExcessParens = hasExcessParens(node.object);
|
|
if (
|
nodeObjHasExcessParens &&
|
precedence(node.object) >= precedence(node) &&
|
(
|
node.computed ||
|
!(
|
astUtils.isDecimalInteger(node.object) ||
|
|
// RegExp literal is allowed to have parens (#1589)
|
(node.object.type === "Literal" && node.object.regex)
|
)
|
)
|
) {
|
report(node.object);
|
}
|
|
if (nodeObjHasExcessParens &&
|
node.object.type === "CallExpression" &&
|
node.parent.type !== "NewExpression") {
|
report(node.object);
|
}
|
|
if (node.computed && hasExcessParens(node.property)) {
|
report(node.property);
|
}
|
},
|
|
NewExpression: checkCallNew,
|
|
ObjectExpression(node) {
|
node.properties
|
.filter(property => {
|
const value = property.value;
|
|
return value && hasExcessParens(value) && precedence(value) >= PRECEDENCE_OF_ASSIGNMENT_EXPR;
|
}).forEach(property => report(property.value));
|
},
|
|
ReturnStatement(node) {
|
const returnToken = sourceCode.getFirstToken(node);
|
|
if (isReturnAssignException(node)) {
|
return;
|
}
|
|
if (node.argument &&
|
hasExcessParensNoLineTerminator(returnToken, node.argument) &&
|
|
// RegExp literal is allowed to have parens (#1589)
|
!(node.argument.type === "Literal" && node.argument.regex)) {
|
report(node.argument);
|
}
|
},
|
|
SequenceExpression(node) {
|
node.expressions
|
.filter(e => hasExcessParens(e) && precedence(e) >= precedence(node))
|
.forEach(report);
|
},
|
|
SwitchCase(node) {
|
if (node.test && hasExcessParens(node.test)) {
|
report(node.test);
|
}
|
},
|
|
SwitchStatement(node) {
|
if (hasDoubleExcessParens(node.discriminant)) {
|
report(node.discriminant);
|
}
|
},
|
|
ThrowStatement(node) {
|
const throwToken = sourceCode.getFirstToken(node);
|
|
if (hasExcessParensNoLineTerminator(throwToken, node.argument)) {
|
report(node.argument);
|
}
|
},
|
|
UnaryExpression: checkUnaryUpdate,
|
UpdateExpression: checkUnaryUpdate,
|
AwaitExpression: checkUnaryUpdate,
|
|
VariableDeclarator(node) {
|
if (node.init && hasExcessParens(node.init) &&
|
precedence(node.init) >= PRECEDENCE_OF_ASSIGNMENT_EXPR &&
|
|
// RegExp literal is allowed to have parens (#1589)
|
!(node.init.type === "Literal" && node.init.regex)) {
|
report(node.init);
|
}
|
},
|
|
WhileStatement(node) {
|
if (hasDoubleExcessParens(node.test) && !isCondAssignException(node)) {
|
report(node.test);
|
}
|
},
|
|
WithStatement(node) {
|
if (hasDoubleExcessParens(node.object)) {
|
report(node.object);
|
}
|
},
|
|
YieldExpression(node) {
|
if (node.argument) {
|
const yieldToken = sourceCode.getFirstToken(node);
|
|
if ((precedence(node.argument) >= precedence(node) &&
|
hasExcessParensNoLineTerminator(yieldToken, node.argument)) ||
|
hasDoubleExcessParens(node.argument)) {
|
report(node.argument);
|
}
|
}
|
},
|
|
ClassDeclaration: checkClass,
|
ClassExpression: checkClass,
|
|
SpreadElement: checkSpreadOperator,
|
SpreadProperty: checkSpreadOperator,
|
ExperimentalSpreadProperty: checkSpreadOperator
|
};
|
|
}
|
};
|
