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