node_modules/eslint/lib/rules/space-infix-ops.js

/**
 * @fileoverview Require spaces around infix operators
 * @author Michael Ficarra
 * @deprecated in ESLint v8.53.0
 */
"use strict";

const { isEqToken } = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
	meta: {
		deprecated: {
			message: "Formatting rules are being moved out of ESLint core.",
			url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
			deprecatedSince: "8.53.0",
			availableUntil: "11.0.0",
			replacedBy: [
				{
					message:
						"ESLint Stylistic now maintains deprecated stylistic core rules.",
					url: "https://eslint.style/guide/migration",
					plugin: {
						name: "@stylistic/eslint-plugin",
						url: "https://eslint.style",
					},
					rule: {
						name: "space-infix-ops",
						url: "https://eslint.style/rules/space-infix-ops",
					},
				},
			],
		},
		type: "layout",

		docs: {
			description: "Require spacing around infix operators",
			recommended: false,
			url: "https://eslint.org/docs/latest/rules/space-infix-ops",
		},

		fixable: "whitespace",

		schema: [
			{
				type: "object",
				properties: {
					int32Hint: {
						type: "boolean",
						default: false,
					},
				},
				additionalProperties: false,
			},
		],

		messages: {
			missingSpace: "Operator '{{operator}}' must be spaced.",
		},
	},

	create(context) {
		const int32Hint = context.options[0]
			? context.options[0].int32Hint === true
			: false;
		const sourceCode = context.sourceCode;

		/**
		 * Returns the first token which violates the rule
		 * @param {ASTNode} left The left node of the main node
		 * @param {ASTNode} right The right node of the main node
		 * @param {string} op The operator of the main node
		 * @returns {Object} The violator token or null
		 * @private
		 */
		function getFirstNonSpacedToken(left, right, op) {
			const operator = sourceCode.getFirstTokenBetween(
				left,
				right,
				token => token.value === op,
			);
			const prev = sourceCode.getTokenBefore(operator);
			const next = sourceCode.getTokenAfter(operator);

			if (
				!sourceCode.isSpaceBetweenTokens(prev, operator) ||
				!sourceCode.isSpaceBetweenTokens(operator, next)
			) {
				return operator;
			}

			return null;
		}

		/**
		 * Reports an AST node as a rule violation
		 * @param {ASTNode} mainNode The node to report
		 * @param {Object} culpritToken The token which has a problem
		 * @returns {void}
		 * @private
		 */
		function report(mainNode, culpritToken) {
			context.report({
				node: mainNode,
				loc: culpritToken.loc,
				messageId: "missingSpace",
				data: {
					operator: culpritToken.value,
				},
				fix(fixer) {
					const previousToken =
						sourceCode.getTokenBefore(culpritToken);
					const afterToken = sourceCode.getTokenAfter(culpritToken);
					let fixString = "";

					if (culpritToken.range[0] - previousToken.range[1] === 0) {
						fixString = " ";
					}

					fixString += culpritToken.value;

					if (afterToken.range[0] - culpritToken.range[1] === 0) {
						fixString += " ";
					}

					return fixer.replaceText(culpritToken, fixString);
				},
			});
		}

		/**
		 * Check if the node is binary then report
		 * @param {ASTNode} node node to evaluate
		 * @returns {void}
		 * @private
		 */
		function checkBinary(node) {
			const leftNode = node.left.typeAnnotation
				? node.left.typeAnnotation
				: node.left;
			const rightNode = node.right;

			// search for = in AssignmentPattern nodes
			const operator = node.operator || "=";

			const nonSpacedNode = getFirstNonSpacedToken(
				leftNode,
				rightNode,
				operator,
			);

			if (nonSpacedNode) {
				if (!(int32Hint && sourceCode.getText(node).endsWith("|0"))) {
					report(node, nonSpacedNode);
				}
			}
		}

		/**
		 * Check if the node is conditional
		 * @param {ASTNode} node node to evaluate
		 * @returns {void}
		 * @private
		 */
		function checkConditional(node) {
			const nonSpacedConsequentNode = getFirstNonSpacedToken(
				node.test,
				node.consequent,
				"?",
			);
			const nonSpacedAlternateNode = getFirstNonSpacedToken(
				node.consequent,
				node.alternate,
				":",
			);

			if (nonSpacedConsequentNode) {
				report(node, nonSpacedConsequentNode);
			}

			if (nonSpacedAlternateNode) {
				report(node, nonSpacedAlternateNode);
			}
		}

		/**
		 * Check if the node is a variable
		 * @param {ASTNode} node node to evaluate
		 * @returns {void}
		 * @private
		 */
		function checkVar(node) {
			const leftNode = node.id.typeAnnotation
				? node.id.typeAnnotation
				: node.id;
			const rightNode = node.init;

			if (rightNode) {
				const nonSpacedNode = getFirstNonSpacedToken(
					leftNode,
					rightNode,
					"=",
				);

				if (nonSpacedNode) {
					report(node, nonSpacedNode);
				}
			}
		}

		return {
			AssignmentExpression: checkBinary,
			AssignmentPattern: checkBinary,
			BinaryExpression: checkBinary,
			LogicalExpression: checkBinary,
			ConditionalExpression: checkConditional,
			VariableDeclarator: checkVar,

			PropertyDefinition(node) {
				if (!node.value) {
					return;
				}

				/*
				 * Because of computed properties and type annotations, some
				 * tokens may exist between `node.key` and `=`.
				 * Therefore, find the `=` from the right.
				 */
				const operatorToken = sourceCode.getTokenBefore(
					node.value,
					isEqToken,
				);
				const leftToken = sourceCode.getTokenBefore(operatorToken);
				const rightToken = sourceCode.getTokenAfter(operatorToken);

				if (
					!sourceCode.isSpaceBetweenTokens(
						leftToken,
						operatorToken,
					) ||
					!sourceCode.isSpaceBetweenTokens(operatorToken, rightToken)
				) {
					report(node, operatorToken);
				}
			},
		};
	},
};