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| Viewing file: Select action/file-type: /**
* @fileoverview Disallow Labeled Statements
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "suggestion",
defaultOptions: [
{
allowLoop: false,
allowSwitch: false,
},
],
docs: {
description: "Disallow labeled statements",
recommended: false,
frozen: true,
url: "https://eslint.org/docs/latest/rules/no-labels",
},
schema: [
{
type: "object",
properties: {
allowLoop: {
type: "boolean",
},
allowSwitch: {
type: "boolean",
},
},
additionalProperties: false,
},
],
messages: {
unexpectedLabel: "Unexpected labeled statement.",
unexpectedLabelInBreak: "Unexpected label in break statement.",
unexpectedLabelInContinue:
"Unexpected label in continue statement.",
},
},
create(context) {
const [{ allowLoop, allowSwitch }] = context.options;
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",
});
}
},
};
},
};
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