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/** * @fileoverview Disallow Labeled Statements * @author Nicholas C. Zakas */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow labeled statements", recommended: false, url: "https://eslint.org/docs/latest/rules/no-labels" }, schema: [ { type: "object", properties: { allowLoop: { type: "boolean", default: false }, allowSwitch: { type: "boolean", default: false } }, additionalProperties: false } ], messages: { unexpectedLabel: "Unexpected labeled statement.", unexpectedLabelInBreak: "Unexpected label in break statement.", unexpectedLabelInContinue: "Unexpected label in continue statement." } }, create(context) { const options = context.options[0]; const allowLoop = options && options.allowLoop; const allowSwitch = options && options.allowSwitch; let scopeInfo = null; /** * Gets the kind of a given node. * @param {ASTNode} node A node to get. * @returns {string} The kind of the node. */ function getBodyKind(node) { if (astUtils.isLoop(node)) { return "loop"; } if (node.type === "SwitchStatement") { return "switch"; } return "other"; } /** * Checks whether the label of a given kind is allowed or not. * @param {string} kind A kind to check. * @returns {boolean} `true` if the kind is allowed. */ function isAllowed(kind) { switch (kind) { case "loop": return allowLoop; case "switch": return allowSwitch; default: return false; } } /** * Checks whether a given name is a label of a loop or not. * @param {string} label A name of a label to check. * @returns {boolean} `true` if the name is a label of a loop. */ function getKind(label) { let info = scopeInfo; while (info) { if (info.label === label) { return info.kind; } info = info.upper; } /* c8 ignore next */ return "other"; } //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { LabeledStatement(node) { scopeInfo = { label: node.label.name, kind: getBodyKind(node.body), upper: scopeInfo }; }, "LabeledStatement:exit"(node) { if (!isAllowed(scopeInfo.kind)) { context.report({ node, messageId: "unexpectedLabel" }); } scopeInfo = scopeInfo.upper; }, BreakStatement(node) { if (node.label && !isAllowed(getKind(node.label.name))) { context.report({ node, messageId: "unexpectedLabelInBreak" }); } }, ContinueStatement(node) { if (node.label && !isAllowed(getKind(node.label.name))) { context.report({ node, messageId: "unexpectedLabelInContinue" }); } } }; } };