142 lines
4.1 KiB
JavaScript
142 lines
4.1 KiB
JavaScript
/**
|
|
* @fileoverview Disallow Labeled Statements
|
|
* @author Nicholas C. Zakas
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("../ast-utils");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
module.exports = {
|
|
meta: {
|
|
docs: {
|
|
description: "disallow labeled statements",
|
|
category: "Best Practices",
|
|
recommended: false
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
allowLoop: {
|
|
type: "boolean"
|
|
},
|
|
allowSwitch: {
|
|
type: "boolean"
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
]
|
|
},
|
|
|
|
create(context) {
|
|
const options = context.options[0];
|
|
const allowLoop = Boolean(options && options.allowLoop);
|
|
const allowSwitch = Boolean(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;
|
|
}
|
|
|
|
/* istanbul ignore next: syntax error */
|
|
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,
|
|
message: "Unexpected labeled statement."
|
|
});
|
|
}
|
|
|
|
scopeInfo = scopeInfo.upper;
|
|
},
|
|
|
|
BreakStatement(node) {
|
|
if (node.label && !isAllowed(getKind(node.label.name))) {
|
|
context.report({
|
|
node,
|
|
message: "Unexpected label in break statement."
|
|
});
|
|
}
|
|
},
|
|
|
|
ContinueStatement(node) {
|
|
if (node.label && !isAllowed(getKind(node.label.name))) {
|
|
context.report({
|
|
node,
|
|
message: "Unexpected label in continue statement."
|
|
});
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
};
|