forked from zhurui/management
752 lines
29 KiB
JavaScript
752 lines
29 KiB
JavaScript
/**
|
|
* @fileoverview Disallow parenthesising higher precedence subexpressions.
|
|
* @author Michael Ficarra
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("../ast-utils.js");
|
|
|
|
module.exports = {
|
|
meta: {
|
|
docs: {
|
|
description: "disallow unnecessary parentheses",
|
|
category: "Possible Errors",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/rules/no-extra-parens"
|
|
},
|
|
|
|
fixable: "code",
|
|
|
|
schema: {
|
|
anyOf: [
|
|
{
|
|
type: "array",
|
|
items: [
|
|
{
|
|
enum: ["functions"]
|
|
}
|
|
],
|
|
minItems: 0,
|
|
maxItems: 1
|
|
},
|
|
{
|
|
type: "array",
|
|
items: [
|
|
{
|
|
enum: ["all"]
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
conditionalAssign: { type: "boolean" },
|
|
nestedBinaryExpressions: { type: "boolean" },
|
|
returnAssign: { type: "boolean" },
|
|
ignoreJSX: { enum: ["none", "all", "single-line", "multi-line"] },
|
|
enforceForArrowConditionals: { type: "boolean" }
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
],
|
|
minItems: 0,
|
|
maxItems: 2
|
|
}
|
|
]
|
|
},
|
|
|
|
messages: {
|
|
unexpected: "Gratuitous parentheses around expression."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
const sourceCode = context.getSourceCode();
|
|
|
|
const tokensToIgnore = new WeakSet();
|
|
const isParenthesised = astUtils.isParenthesised.bind(astUtils, sourceCode);
|
|
const precedence = astUtils.getPrecedence;
|
|
const ALL_NODES = context.options[0] !== "functions";
|
|
const EXCEPT_COND_ASSIGN = ALL_NODES && context.options[1] && context.options[1].conditionalAssign === false;
|
|
const NESTED_BINARY = ALL_NODES && context.options[1] && context.options[1].nestedBinaryExpressions === false;
|
|
const EXCEPT_RETURN_ASSIGN = ALL_NODES && context.options[1] && context.options[1].returnAssign === false;
|
|
const IGNORE_JSX = ALL_NODES && context.options[1] && context.options[1].ignoreJSX;
|
|
const IGNORE_ARROW_CONDITIONALS = ALL_NODES && context.options[1] &&
|
|
context.options[1].enforceForArrowConditionals === false;
|
|
|
|
const PRECEDENCE_OF_ASSIGNMENT_EXPR = precedence({ type: "AssignmentExpression" });
|
|
const PRECEDENCE_OF_UPDATE_EXPR = precedence({ type: "UpdateExpression" });
|
|
|
|
/**
|
|
* Determines if this rule should be enforced for a node given the current configuration.
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the rule should be enforced for this node.
|
|
* @private
|
|
*/
|
|
function ruleApplies(node) {
|
|
if (node.type === "JSXElement") {
|
|
const isSingleLine = node.loc.start.line === node.loc.end.line;
|
|
|
|
switch (IGNORE_JSX) {
|
|
|
|
// Exclude this JSX element from linting
|
|
case "all":
|
|
return false;
|
|
|
|
// Exclude this JSX element if it is multi-line element
|
|
case "multi-line":
|
|
return isSingleLine;
|
|
|
|
// Exclude this JSX element if it is single-line element
|
|
case "single-line":
|
|
return !isSingleLine;
|
|
|
|
// Nothing special to be done for JSX elements
|
|
case "none":
|
|
break;
|
|
|
|
// no default
|
|
}
|
|
}
|
|
|
|
return ALL_NODES || node.type === "FunctionExpression" || node.type === "ArrowFunctionExpression";
|
|
}
|
|
|
|
/**
|
|
* Determines if a node is surrounded by parentheses twice.
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is doubly parenthesised.
|
|
* @private
|
|
*/
|
|
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];
|
|
}
|
|
|
|
/**
|
|
* Determines if a node is surrounded by (potentially) invalid parentheses.
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is incorrectly parenthesised.
|
|
* @private
|
|
*/
|
|
function hasExcessParens(node) {
|
|
return ruleApplies(node) && isParenthesised(node);
|
|
}
|
|
|
|
/**
|
|
* Determines if a node that is expected to be parenthesised is surrounded by
|
|
* (potentially) invalid extra parentheses.
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is has an unexpected extra pair of parentheses.
|
|
* @private
|
|
*/
|
|
function hasDoubleExcessParens(node) {
|
|
return ruleApplies(node) && isParenthesisedTwice(node);
|
|
}
|
|
|
|
/**
|
|
* Determines if a node test expression is allowed to have a parenthesised assignment
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the assignment can be parenthesised.
|
|
* @private
|
|
*/
|
|
function isCondAssignException(node) {
|
|
return EXCEPT_COND_ASSIGN && node.test.type === "AssignmentExpression";
|
|
}
|
|
|
|
/**
|
|
* Determines if a node is in a return statement
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is in a return statement.
|
|
* @private
|
|
*/
|
|
function isInReturnStatement(node) {
|
|
for (let currentNode = node; currentNode; currentNode = currentNode.parent) {
|
|
if (
|
|
currentNode.type === "ReturnStatement" ||
|
|
(currentNode.type === "ArrowFunctionExpression" && currentNode.body.type !== "BlockStatement")
|
|
) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Determines if a constructor function is newed-up with parens
|
|
* @param {ASTNode} newExpression - The NewExpression node to be checked.
|
|
* @returns {boolean} True if the constructor is called with parens.
|
|
* @private
|
|
*/
|
|
function isNewExpressionWithParens(newExpression) {
|
|
const lastToken = sourceCode.getLastToken(newExpression);
|
|
const penultimateToken = sourceCode.getTokenBefore(lastToken);
|
|
|
|
return newExpression.arguments.length > 0 || astUtils.isOpeningParenToken(penultimateToken) && astUtils.isClosingParenToken(lastToken);
|
|
}
|
|
|
|
/**
|
|
* Determines if a node is or contains an assignment expression
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is or contains an assignment expression.
|
|
* @private
|
|
*/
|
|
function containsAssignment(node) {
|
|
if (node.type === "AssignmentExpression") {
|
|
return true;
|
|
}
|
|
if (node.type === "ConditionalExpression" &&
|
|
(node.consequent.type === "AssignmentExpression" || node.alternate.type === "AssignmentExpression")) {
|
|
return true;
|
|
}
|
|
if ((node.left && node.left.type === "AssignmentExpression") ||
|
|
(node.right && node.right.type === "AssignmentExpression")) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Determines if a node is contained by or is itself a return statement and is allowed to have a parenthesised assignment
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the assignment can be parenthesised.
|
|
* @private
|
|
*/
|
|
function isReturnAssignException(node) {
|
|
if (!EXCEPT_RETURN_ASSIGN || !isInReturnStatement(node)) {
|
|
return false;
|
|
}
|
|
|
|
if (node.type === "ReturnStatement") {
|
|
return node.argument && containsAssignment(node.argument);
|
|
}
|
|
if (node.type === "ArrowFunctionExpression" && node.body.type !== "BlockStatement") {
|
|
return containsAssignment(node.body);
|
|
}
|
|
return containsAssignment(node);
|
|
|
|
}
|
|
|
|
/**
|
|
* Determines if a node following a [no LineTerminator here] restriction is
|
|
* surrounded by (potentially) invalid extra parentheses.
|
|
* @param {Token} token - The token preceding the [no LineTerminator here] restriction.
|
|
* @param {ASTNode} node - The node to be checked.
|
|
* @returns {boolean} True if the node is incorrectly parenthesised.
|
|
* @private
|
|
*/
|
|
function hasExcessParensNoLineTerminator(token, node) {
|
|
if (token.loc.end.line === node.loc.start.line) {
|
|
return hasExcessParens(node);
|
|
}
|
|
|
|
return hasDoubleExcessParens(node);
|
|
}
|
|
|
|
/**
|
|
* Determines whether a node should be preceded by an additional space when removing parens
|
|
* @param {ASTNode} node node to evaluate; must be surrounded by parentheses
|
|
* @returns {boolean} `true` if a space should be inserted before the node
|
|
* @private
|
|
*/
|
|
function requiresLeadingSpace(node) {
|
|
const leftParenToken = sourceCode.getTokenBefore(node);
|
|
const tokenBeforeLeftParen = sourceCode.getTokenBefore(node, 1);
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
|
|
return tokenBeforeLeftParen &&
|
|
tokenBeforeLeftParen.range[1] === leftParenToken.range[0] &&
|
|
leftParenToken.range[1] === firstToken.range[0] &&
|
|
!astUtils.canTokensBeAdjacent(tokenBeforeLeftParen, firstToken);
|
|
}
|
|
|
|
/**
|
|
* Determines whether a node should be followed by an additional space when removing parens
|
|
* @param {ASTNode} node node to evaluate; must be surrounded by parentheses
|
|
* @returns {boolean} `true` if a space should be inserted after the node
|
|
* @private
|
|
*/
|
|
function requiresTrailingSpace(node) {
|
|
const nextTwoTokens = sourceCode.getTokensAfter(node, { count: 2 });
|
|
const rightParenToken = nextTwoTokens[0];
|
|
const tokenAfterRightParen = nextTwoTokens[1];
|
|
const tokenBeforeRightParen = sourceCode.getLastToken(node);
|
|
|
|
return rightParenToken && tokenAfterRightParen &&
|
|
!sourceCode.isSpaceBetweenTokens(rightParenToken, tokenAfterRightParen) &&
|
|
!astUtils.canTokensBeAdjacent(tokenBeforeRightParen, tokenAfterRightParen);
|
|
}
|
|
|
|
/**
|
|
* Determines if a given expression node is an IIFE
|
|
* @param {ASTNode} node The node to check
|
|
* @returns {boolean} `true` if the given node is an IIFE
|
|
*/
|
|
function isIIFE(node) {
|
|
return node.type === "CallExpression" && node.callee.type === "FunctionExpression";
|
|
}
|
|
|
|
/**
|
|
* Report the node
|
|
* @param {ASTNode} node node to evaluate
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function report(node) {
|
|
const leftParenToken = sourceCode.getTokenBefore(node);
|
|
const rightParenToken = sourceCode.getTokenAfter(node);
|
|
|
|
if (!isParenthesisedTwice(node)) {
|
|
if (tokensToIgnore.has(sourceCode.getFirstToken(node))) {
|
|
return;
|
|
}
|
|
|
|
if (isIIFE(node) && !isParenthesised(node.callee)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
context.report({
|
|
node,
|
|
loc: leftParenToken.loc.start,
|
|
messageId: "unexpected",
|
|
fix(fixer) {
|
|
const parenthesizedSource = sourceCode.text.slice(leftParenToken.range[1], rightParenToken.range[0]);
|
|
|
|
return fixer.replaceTextRange([
|
|
leftParenToken.range[0],
|
|
rightParenToken.range[1]
|
|
], (requiresLeadingSpace(node) ? " " : "") + parenthesizedSource + (requiresTrailingSpace(node) ? " " : ""));
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Evaluate Unary update
|
|
* @param {ASTNode} node node to evaluate
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkUnaryUpdate(node) {
|
|
if (node.type === "UnaryExpression" && node.argument.type === "BinaryExpression" && node.argument.operator === "**") {
|
|
return;
|
|
}
|
|
|
|
if (hasExcessParens(node.argument) && precedence(node.argument) >= precedence(node)) {
|
|
report(node.argument);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if a member expression contains a call expression
|
|
* @param {ASTNode} node MemberExpression node to evaluate
|
|
* @returns {boolean} true if found, false if not
|
|
*/
|
|
function doesMemberExpressionContainCallExpression(node) {
|
|
let currentNode = node.object;
|
|
let currentNodeType = node.object.type;
|
|
|
|
while (currentNodeType === "MemberExpression") {
|
|
currentNode = currentNode.object;
|
|
currentNodeType = currentNode.type;
|
|
}
|
|
|
|
return currentNodeType === "CallExpression";
|
|
}
|
|
|
|
/**
|
|
* Evaluate a new call
|
|
* @param {ASTNode} node node to evaluate
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkCallNew(node) {
|
|
const callee = node.callee;
|
|
|
|
if (hasExcessParens(callee) && precedence(callee) >= precedence(node)) {
|
|
const hasNewParensException = callee.type === "NewExpression" && !isNewExpressionWithParens(callee);
|
|
|
|
if (
|
|
hasDoubleExcessParens(callee) ||
|
|
!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);
|
|
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;
|
|
|
|
if (
|
|
astUtils.isOpeningParenToken(firstToken) &&
|
|
(
|
|
astUtils.isOpeningBraceToken(secondToken) ||
|
|
secondToken.type === "Keyword" && (
|
|
secondToken.value === "function" ||
|
|
secondToken.value === "class" ||
|
|
secondToken.value === "let" && astUtils.isOpeningBracketToken(sourceCode.getTokenAfter(secondToken, astUtils.isNotClosingParenToken))
|
|
) ||
|
|
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
|
|
};
|
|
|
|
}
|
|
};
|