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/**
* @fileoverview Disallows or enforces spaces inside of parentheses.
* @author Jonathan Rajavuori
*/
"use strict";
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce consistent spacing inside parentheses",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/space-in-parens"
},
fixable: "whitespace",
schema: [
{
enum: ["always", "never"]
},
{
type: "object",
properties: {
exceptions: {
type: "array",
items: {
enum: ["{}", "[]", "()", "empty"]
},
uniqueItems: true
}
},
additionalProperties: false
}
],
messages: {
missingOpeningSpace: "There must be a space after this paren.",
missingClosingSpace: "There must be a space before this paren.",
rejectedOpeningSpace: "There should be no space after this paren.",
rejectedClosingSpace: "There should be no space before this paren."
}
},
create(context) {
const ALWAYS = context.options[0] === "always",
exceptionsArrayOptions = (context.options[1] && context.options[1].exceptions) || [],
options = {};
let exceptions;
if (exceptionsArrayOptions.length) {
options.braceException = exceptionsArrayOptions.includes("{}");
options.bracketException = exceptionsArrayOptions.includes("[]");
options.parenException = exceptionsArrayOptions.includes("()");
options.empty = exceptionsArrayOptions.includes("empty");
}
/**
* Produces an object with the opener and closer exception values
* @returns {Object} `openers` and `closers` exception values
* @private
*/
function getExceptions() {
const openers = [],
closers = [];
if (options.braceException) {
openers.push("{");
closers.push("}");
}
if (options.bracketException) {
openers.push("[");
closers.push("]");
}
if (options.parenException) {
openers.push("(");
closers.push(")");
}
if (options.empty) {
openers.push(")");
closers.push("(");
}
return {
openers,
closers
};
}
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
const sourceCode = context.getSourceCode();
/**
* Determines if a token is one of the exceptions for the opener paren
* @param {Object} token The token to check
* @returns {boolean} True if the token is one of the exceptions for the opener paren
*/
function isOpenerException(token) {
return exceptions.openers.includes(token.value);
}
/**
* Determines if a token is one of the exceptions for the closer paren
* @param {Object} token The token to check
* @returns {boolean} True if the token is one of the exceptions for the closer paren
*/
function isCloserException(token) {
return exceptions.closers.includes(token.value);
}
/**
* Determines if an opening paren is immediately followed by a required space
* @param {Object} openingParenToken The paren token
* @param {Object} tokenAfterOpeningParen The token after it
* @returns {boolean} True if the opening paren is missing a required space
*/
function openerMissingSpace(openingParenToken, tokenAfterOpeningParen) {
if (sourceCode.isSpaceBetweenTokens(openingParenToken, tokenAfterOpeningParen)) {
return false;
}
if (!options.empty && astUtils.isClosingParenToken(tokenAfterOpeningParen)) {
return false;
}
if (ALWAYS) {
return !isOpenerException(tokenAfterOpeningParen);
}
return isOpenerException(tokenAfterOpeningParen);
}
/**
* Determines if an opening paren is immediately followed by a disallowed space
* @param {Object} openingParenToken The paren token
* @param {Object} tokenAfterOpeningParen The token after it
* @returns {boolean} True if the opening paren has a disallowed space
*/
function openerRejectsSpace(openingParenToken, tokenAfterOpeningParen) {
if (!astUtils.isTokenOnSameLine(openingParenToken, tokenAfterOpeningParen)) {
return false;
}
if (tokenAfterOpeningParen.type === "Line") {
return false;
}
if (!sourceCode.isSpaceBetweenTokens(openingParenToken, tokenAfterOpeningParen)) {
return false;
}
if (ALWAYS) {
return isOpenerException(tokenAfterOpeningParen);
}
return !isOpenerException(tokenAfterOpeningParen);
}
/**
* Determines if a closing paren is immediately preceeded by a required space
* @param {Object} tokenBeforeClosingParen The token before the paren
* @param {Object} closingParenToken The paren token
* @returns {boolean} True if the closing paren is missing a required space
*/
function closerMissingSpace(tokenBeforeClosingParen, closingParenToken) {
if (sourceCode.isSpaceBetweenTokens(tokenBeforeClosingParen, closingParenToken)) {
return false;
}
if (!options.empty && astUtils.isOpeningParenToken(tokenBeforeClosingParen)) {
return false;
}
if (ALWAYS) {
return !isCloserException(tokenBeforeClosingParen);
}
return isCloserException(tokenBeforeClosingParen);
}
/**
* Determines if a closer paren is immediately preceeded by a disallowed space
* @param {Object} tokenBeforeClosingParen The token before the paren
* @param {Object} closingParenToken The paren token
* @returns {boolean} True if the closing paren has a disallowed space
*/
function closerRejectsSpace(tokenBeforeClosingParen, closingParenToken) {
if (!astUtils.isTokenOnSameLine(tokenBeforeClosingParen, closingParenToken)) {
return false;
}
if (!sourceCode.isSpaceBetweenTokens(tokenBeforeClosingParen, closingParenToken)) {
return false;
}
if (ALWAYS) {
return isCloserException(tokenBeforeClosingParen);
}
return !isCloserException(tokenBeforeClosingParen);
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
Program: function checkParenSpaces(node) {
exceptions = getExceptions();
const tokens = sourceCode.tokensAndComments;
tokens.forEach((token, i) => {
const prevToken = tokens[i - 1];
const nextToken = tokens[i + 1];
// if token is not an opening or closing paren token, do nothing
if (!astUtils.isOpeningParenToken(token) && !astUtils.isClosingParenToken(token)) {
return;
}
// if token is an opening paren and is not followed by a required space
if (token.value === "(" && openerMissingSpace(token, nextToken)) {
context.report({
node,
loc: token.loc.start,
messageId: "missingOpeningSpace",
fix(fixer) {
return fixer.insertTextAfter(token, " ");
}
});
}
// if token is an opening paren and is followed by a disallowed space
if (token.value === "(" && openerRejectsSpace(token, nextToken)) {
context.report({
node,
loc: token.loc.start,
messageId: "rejectedOpeningSpace",
fix(fixer) {
return fixer.removeRange([token.range[1], nextToken.range[0]]);
}
});
}
// if token is a closing paren and is not preceded by a required space
if (token.value === ")" && closerMissingSpace(prevToken, token)) {
context.report({
node,
loc: token.loc.start,
messageId: "missingClosingSpace",
fix(fixer) {
return fixer.insertTextBefore(token, " ");
}
});
}
// if token is a closing paren and is preceded by a disallowed space
if (token.value === ")" && closerRejectsSpace(prevToken, token)) {
context.report({
node,
loc: token.loc.start,
messageId: "rejectedClosingSpace",
fix(fixer) {
return fixer.removeRange([prevToken.range[1], token.range[0]]);
}
});
}
});
}
};
}
};
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