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/** * @fileoverview Rule to disallow unused labels. * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow unused labels", recommended: true, url: "https://eslint.org/docs/latest/rules/no-unused-labels" }, schema: [], fixable: "code", messages: { unused: "'{{name}}:' is defined but never used." } }, create(context) { const sourceCode = context.sourceCode; let scopeInfo = null; /** * Adds a scope info to the stack. * @param {ASTNode} node A node to add. This is a LabeledStatement. * @returns {void} */ function enterLabeledScope(node) { scopeInfo = { label: node.label.name, used: false, upper: scopeInfo }; } /** * Checks if a `LabeledStatement` node is fixable. * For a node to be fixable, there must be no comments between the label and the body. * Furthermore, is must be possible to remove the label without turning the body statement into a * directive after other fixes are applied. * @param {ASTNode} node The node to evaluate. * @returns {boolean} Whether or not the node is fixable. */ function isFixable(node) { /* * Only perform a fix if there are no comments between the label and the body. This will be the case * when there is exactly one token/comment (the ":") between the label and the body. */ if (sourceCode.getTokenAfter(node.label, { includeComments: true }) !== sourceCode.getTokenBefore(node.body, { includeComments: true })) { return false; } // Looking for the node's deepest ancestor which is not a `LabeledStatement`. let ancestor = node.parent; while (ancestor.type === "LabeledStatement") { ancestor = ancestor.parent; } if (ancestor.type === "Program" || (ancestor.type === "BlockStatement" && astUtils.isFunction(ancestor.parent))) { const { body } = node; if (body.type === "ExpressionStatement" && ((body.expression.type === "Literal" && typeof body.expression.value === "string") || astUtils.isStaticTemplateLiteral(body.expression))) { return false; // potential directive } } return true; } /** * Removes the top of the stack. * At the same time, this reports the label if it's never used. * @param {ASTNode} node A node to report. This is a LabeledStatement. * @returns {void} */ function exitLabeledScope(node) { if (!scopeInfo.used) { context.report({ node: node.label, messageId: "unused", data: node.label, fix: isFixable(node) ? fixer => fixer.removeRange([node.range[0], node.body.range[0]]) : null }); } scopeInfo = scopeInfo.upper; } /** * Marks the label of a given node as used. * @param {ASTNode} node A node to mark. This is a BreakStatement or * ContinueStatement. * @returns {void} */ function markAsUsed(node) { if (!node.label) { return; } const label = node.label.name; let info = scopeInfo; while (info) { if (info.label === label) { info.used = true; break; } info = info.upper; } } return { LabeledStatement: enterLabeledScope, "LabeledStatement:exit": exitLabeledScope, BreakStatement: markAsUsed, ContinueStatement: markAsUsed }; } };