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