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Viewing file:     no-unsafe-finally.js (3.26 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag unsafe statements in finally block
 * @author Onur Temizkan
 */

"use strict";

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

const SENTINEL_NODE_TYPE_RETURN_THROW =
	/^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression)$/u;
const SENTINEL_NODE_TYPE_BREAK =
	/^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|DoWhileStatement|WhileStatement|ForOfStatement|ForInStatement|ForStatement|SwitchStatement)$/u;
const SENTINEL_NODE_TYPE_CONTINUE =
	/^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|DoWhileStatement|WhileStatement|ForOfStatement|ForInStatement|ForStatement)$/u;

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

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
	meta: {
		type: "problem",

		docs: {
			description: "Disallow control flow statements in `finally` blocks",
			recommended: true,
			url: "https://eslint.org/docs/latest/rules/no-unsafe-finally",
		},

		schema: [],

		messages: {
			unsafeUsage: "Unsafe usage of {{nodeType}}.",
		},
	},
	create(context) {
		/**
		 * Checks if the node is the finalizer of a TryStatement
		 * @param {ASTNode} node node to check.
		 * @returns {boolean} - true if the node is the finalizer of a TryStatement
		 */
		function isFinallyBlock(node) {
			return (
				node.parent.type === "TryStatement" &&
				node.parent.finalizer === node
			);
		}

		/**
		 * Climbs up the tree if the node is not a sentinel node
		 * @param {ASTNode} node node to check.
		 * @param {string} label label of the break or continue statement
		 * @returns {boolean} - return whether the node is a finally block or a sentinel node
		 */
		function isInFinallyBlock(node, label) {
			let labelInside = false;
			let sentinelNodeType;

			if (node.type === "BreakStatement" && !node.label) {
				sentinelNodeType = SENTINEL_NODE_TYPE_BREAK;
			} else if (node.type === "ContinueStatement") {
				sentinelNodeType = SENTINEL_NODE_TYPE_CONTINUE;
			} else {
				sentinelNodeType = SENTINEL_NODE_TYPE_RETURN_THROW;
			}

			for (
				let currentNode = node;
				currentNode && !sentinelNodeType.test(currentNode.type);
				currentNode = currentNode.parent
			) {
				if (
					currentNode.parent.label &&
					label &&
					currentNode.parent.label.name === label.name
				) {
					labelInside = true;
				}
				if (isFinallyBlock(currentNode)) {
					if (label && labelInside) {
						return false;
					}
					return true;
				}
			}
			return false;
		}

		/**
		 * Checks whether the possibly-unsafe statement is inside a finally block.
		 * @param {ASTNode} node node to check.
		 * @returns {void}
		 */
		function check(node) {
			if (isInFinallyBlock(node, node.label)) {
				context.report({
					messageId: "unsafeUsage",
					data: {
						nodeType: node.type,
					},
					node,
					line: node.loc.line,
					column: node.loc.column,
				});
			}
		}

		return {
			ReturnStatement: check,
			ThrowStatement: check,
			BreakStatement: check,
			ContinueStatement: check,
		};
	},
};