322 lines
12 KiB
JavaScript
322 lines
12 KiB
JavaScript
/**
|
|
* @fileoverview This rule should require or disallow spaces before or after unary operations.
|
|
* @author Marcin Kumorek
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("./utils/ast-utils");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "layout",
|
|
|
|
docs: {
|
|
description: "Enforce consistent spacing before or after unary operators",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/space-unary-ops"
|
|
},
|
|
|
|
fixable: "whitespace",
|
|
|
|
schema: [
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
words: {
|
|
type: "boolean",
|
|
default: true
|
|
},
|
|
nonwords: {
|
|
type: "boolean",
|
|
default: false
|
|
},
|
|
overrides: {
|
|
type: "object",
|
|
additionalProperties: {
|
|
type: "boolean"
|
|
}
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
],
|
|
messages: {
|
|
unexpectedBefore: "Unexpected space before unary operator '{{operator}}'.",
|
|
unexpectedAfter: "Unexpected space after unary operator '{{operator}}'.",
|
|
unexpectedAfterWord: "Unexpected space after unary word operator '{{word}}'.",
|
|
wordOperator: "Unary word operator '{{word}}' must be followed by whitespace.",
|
|
operator: "Unary operator '{{operator}}' must be followed by whitespace.",
|
|
beforeUnaryExpressions: "Space is required before unary expressions '{{token}}'."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
const options = context.options[0] || { words: true, nonwords: false };
|
|
|
|
const sourceCode = context.sourceCode;
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Helpers
|
|
//--------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Check if the node is the first "!" in a "!!" convert to Boolean expression
|
|
* @param {ASTnode} node AST node
|
|
* @returns {boolean} Whether or not the node is first "!" in "!!"
|
|
*/
|
|
function isFirstBangInBangBangExpression(node) {
|
|
return node && node.type === "UnaryExpression" && node.argument.operator === "!" &&
|
|
node.argument && node.argument.type === "UnaryExpression" && node.argument.operator === "!";
|
|
}
|
|
|
|
/**
|
|
* Checks if an override exists for a given operator.
|
|
* @param {string} operator Operator
|
|
* @returns {boolean} Whether or not an override has been provided for the operator
|
|
*/
|
|
function overrideExistsForOperator(operator) {
|
|
return options.overrides && Object.prototype.hasOwnProperty.call(options.overrides, operator);
|
|
}
|
|
|
|
/**
|
|
* Gets the value that the override was set to for this operator
|
|
* @param {string} operator Operator
|
|
* @returns {boolean} Whether or not an override enforces a space with this operator
|
|
*/
|
|
function overrideEnforcesSpaces(operator) {
|
|
return options.overrides[operator];
|
|
}
|
|
|
|
/**
|
|
* Verify Unary Word Operator has spaces after the word operator
|
|
* @param {ASTnode} node AST node
|
|
* @param {Object} firstToken first token from the AST node
|
|
* @param {Object} secondToken second token from the AST node
|
|
* @param {string} word The word to be used for reporting
|
|
* @returns {void}
|
|
*/
|
|
function verifyWordHasSpaces(node, firstToken, secondToken, word) {
|
|
if (secondToken.range[0] === firstToken.range[1]) {
|
|
context.report({
|
|
node,
|
|
messageId: "wordOperator",
|
|
data: {
|
|
word
|
|
},
|
|
fix(fixer) {
|
|
return fixer.insertTextAfter(firstToken, " ");
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verify Unary Word Operator doesn't have spaces after the word operator
|
|
* @param {ASTnode} node AST node
|
|
* @param {Object} firstToken first token from the AST node
|
|
* @param {Object} secondToken second token from the AST node
|
|
* @param {string} word The word to be used for reporting
|
|
* @returns {void}
|
|
*/
|
|
function verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word) {
|
|
if (astUtils.canTokensBeAdjacent(firstToken, secondToken)) {
|
|
if (secondToken.range[0] > firstToken.range[1]) {
|
|
context.report({
|
|
node,
|
|
messageId: "unexpectedAfterWord",
|
|
data: {
|
|
word
|
|
},
|
|
fix(fixer) {
|
|
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check Unary Word Operators for spaces after the word operator
|
|
* @param {ASTnode} node AST node
|
|
* @param {Object} firstToken first token from the AST node
|
|
* @param {Object} secondToken second token from the AST node
|
|
* @param {string} word The word to be used for reporting
|
|
* @returns {void}
|
|
*/
|
|
function checkUnaryWordOperatorForSpaces(node, firstToken, secondToken, word) {
|
|
if (overrideExistsForOperator(word)) {
|
|
if (overrideEnforcesSpaces(word)) {
|
|
verifyWordHasSpaces(node, firstToken, secondToken, word);
|
|
} else {
|
|
verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word);
|
|
}
|
|
} else if (options.words) {
|
|
verifyWordHasSpaces(node, firstToken, secondToken, word);
|
|
} else {
|
|
verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies YieldExpressions satisfy spacing requirements
|
|
* @param {ASTnode} node AST node
|
|
* @returns {void}
|
|
*/
|
|
function checkForSpacesAfterYield(node) {
|
|
const tokens = sourceCode.getFirstTokens(node, 3),
|
|
word = "yield";
|
|
|
|
if (!node.argument || node.delegate) {
|
|
return;
|
|
}
|
|
|
|
checkUnaryWordOperatorForSpaces(node, tokens[0], tokens[1], word);
|
|
}
|
|
|
|
/**
|
|
* Verifies AwaitExpressions satisfy spacing requirements
|
|
* @param {ASTNode} node AwaitExpression AST node
|
|
* @returns {void}
|
|
*/
|
|
function checkForSpacesAfterAwait(node) {
|
|
const tokens = sourceCode.getFirstTokens(node, 3);
|
|
|
|
checkUnaryWordOperatorForSpaces(node, tokens[0], tokens[1], "await");
|
|
}
|
|
|
|
/**
|
|
* Verifies UnaryExpression, UpdateExpression and NewExpression have spaces before or after the operator
|
|
* @param {ASTnode} node AST node
|
|
* @param {Object} firstToken First token in the expression
|
|
* @param {Object} secondToken Second token in the expression
|
|
* @returns {void}
|
|
*/
|
|
function verifyNonWordsHaveSpaces(node, firstToken, secondToken) {
|
|
if (node.prefix) {
|
|
if (isFirstBangInBangBangExpression(node)) {
|
|
return;
|
|
}
|
|
if (firstToken.range[1] === secondToken.range[0]) {
|
|
context.report({
|
|
node,
|
|
messageId: "operator",
|
|
data: {
|
|
operator: firstToken.value
|
|
},
|
|
fix(fixer) {
|
|
return fixer.insertTextAfter(firstToken, " ");
|
|
}
|
|
});
|
|
}
|
|
} else {
|
|
if (firstToken.range[1] === secondToken.range[0]) {
|
|
context.report({
|
|
node,
|
|
messageId: "beforeUnaryExpressions",
|
|
data: {
|
|
token: secondToken.value
|
|
},
|
|
fix(fixer) {
|
|
return fixer.insertTextBefore(secondToken, " ");
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies UnaryExpression, UpdateExpression and NewExpression don't have spaces before or after the operator
|
|
* @param {ASTnode} node AST node
|
|
* @param {Object} firstToken First token in the expression
|
|
* @param {Object} secondToken Second token in the expression
|
|
* @returns {void}
|
|
*/
|
|
function verifyNonWordsDontHaveSpaces(node, firstToken, secondToken) {
|
|
if (node.prefix) {
|
|
if (secondToken.range[0] > firstToken.range[1]) {
|
|
context.report({
|
|
node,
|
|
messageId: "unexpectedAfter",
|
|
data: {
|
|
operator: firstToken.value
|
|
},
|
|
fix(fixer) {
|
|
if (astUtils.canTokensBeAdjacent(firstToken, secondToken)) {
|
|
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
|
|
}
|
|
return null;
|
|
}
|
|
});
|
|
}
|
|
} else {
|
|
if (secondToken.range[0] > firstToken.range[1]) {
|
|
context.report({
|
|
node,
|
|
messageId: "unexpectedBefore",
|
|
data: {
|
|
operator: secondToken.value
|
|
},
|
|
fix(fixer) {
|
|
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies UnaryExpression, UpdateExpression and NewExpression satisfy spacing requirements
|
|
* @param {ASTnode} node AST node
|
|
* @returns {void}
|
|
*/
|
|
function checkForSpaces(node) {
|
|
const tokens = node.type === "UpdateExpression" && !node.prefix
|
|
? sourceCode.getLastTokens(node, 2)
|
|
: sourceCode.getFirstTokens(node, 2);
|
|
const firstToken = tokens[0];
|
|
const secondToken = tokens[1];
|
|
|
|
if ((node.type === "NewExpression" || node.prefix) && firstToken.type === "Keyword") {
|
|
checkUnaryWordOperatorForSpaces(node, firstToken, secondToken, firstToken.value);
|
|
return;
|
|
}
|
|
|
|
const operator = node.prefix ? tokens[0].value : tokens[1].value;
|
|
|
|
if (overrideExistsForOperator(operator)) {
|
|
if (overrideEnforcesSpaces(operator)) {
|
|
verifyNonWordsHaveSpaces(node, firstToken, secondToken);
|
|
} else {
|
|
verifyNonWordsDontHaveSpaces(node, firstToken, secondToken);
|
|
}
|
|
} else if (options.nonwords) {
|
|
verifyNonWordsHaveSpaces(node, firstToken, secondToken);
|
|
} else {
|
|
verifyNonWordsDontHaveSpaces(node, firstToken, secondToken);
|
|
}
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Public
|
|
//--------------------------------------------------------------------------
|
|
|
|
return {
|
|
UnaryExpression: checkForSpaces,
|
|
UpdateExpression: checkForSpaces,
|
|
NewExpression: checkForSpaces,
|
|
YieldExpression: checkForSpacesAfterYield,
|
|
AwaitExpression: checkForSpacesAfterAwait
|
|
};
|
|
|
|
}
|
|
};
|