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/**
* @fileoverview Checks for unreachable code due to return, throws, break, and continue.
* @author Joel Feenstra
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Checks whether or not a given variable declarator has the initializer.
* @param {ASTNode} node - A VariableDeclarator node to check.
* @returns {boolean} `true` if the node has the initializer.
*/
function isInitialized(node) {
return Boolean(node.init);
}
/**
* Checks whether or not a given code path segment is unreachable.
* @param {CodePathSegment} segment - A CodePathSegment to check.
* @returns {boolean} `true` if the segment is unreachable.
*/
function isUnreachable(segment) {
return !segment.reachable;
}
/**
* The class to distinguish consecutive unreachable statements.
*/
class ConsecutiveRange {
constructor(sourceCode) {
this.sourceCode = sourceCode;
this.startNode = null;
this.endNode = null;
}
/**
* The location object of this range.
* @type {Object}
*/
get location() {
return {
start: this.startNode.loc.start,
end: this.endNode.loc.end
};
}
/**
* `true` if this range is empty.
* @type {boolean}
*/
get isEmpty() {
return !(this.startNode && this.endNode);
}
/**
* Checks whether the given node is inside of this range.
* @param {ASTNode|Token} node - The node to check.
* @returns {boolean} `true` if the node is inside of this range.
*/
contains(node) {
return (
node.range[0] >= this.startNode.range[0] &&
node.range[1] <= this.endNode.range[1]
);
}
/**
* Checks whether the given node is consecutive to this range.
* @param {ASTNode} node - The node to check.
* @returns {boolean} `true` if the node is consecutive to this range.
*/
isConsecutive(node) {
return this.contains(this.sourceCode.getTokenBefore(node));
}
/**
* Merges the given node to this range.
* @param {ASTNode} node - The node to merge.
* @returns {void}
*/
merge(node) {
this.endNode = node;
}
/**
* Resets this range by the given node or null.
* @param {ASTNode|null} node - The node to reset, or null.
* @returns {void}
*/
reset(node) {
this.startNode = this.endNode = node;
}
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "problem",
docs: {
description: "disallow unreachable code after `return`, `throw`, `continue`, and `break` statements",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/rules/no-unreachable"
},
schema: []
},
create(context) {
let currentCodePath = null;
const range = new ConsecutiveRange(context.getSourceCode());
/**
* Reports a given node if it's unreachable.
* @param {ASTNode} node - A statement node to report.
* @returns {void}
*/
function reportIfUnreachable(node) {
let nextNode = null;
if (node && currentCodePath.currentSegments.every(isUnreachable)) {
// Store this statement to distinguish consecutive statements.
if (range.isEmpty) {
range.reset(node);
return;
}
// Skip if this statement is inside of the current range.
if (range.contains(node)) {
return;
}
// Merge if this statement is consecutive to the current range.
if (range.isConsecutive(node)) {
range.merge(node);
return;
}
nextNode = node;
}
/*
* Report the current range since this statement is reachable or is
* not consecutive to the current range.
*/
if (!range.isEmpty) {
context.report({
message: "Unreachable code.",
loc: range.location,
node: range.startNode
});
}
// Update the current range.
range.reset(nextNode);
}
return {
// Manages the current code path.
onCodePathStart(codePath) {
currentCodePath = codePath;
},
onCodePathEnd() {
currentCodePath = currentCodePath.upper;
},
// Registers for all statement nodes (excludes FunctionDeclaration).
BlockStatement: reportIfUnreachable,
BreakStatement: reportIfUnreachable,
ClassDeclaration: reportIfUnreachable,
ContinueStatement: reportIfUnreachable,
DebuggerStatement: reportIfUnreachable,
DoWhileStatement: reportIfUnreachable,
ExpressionStatement: reportIfUnreachable,
ForInStatement: reportIfUnreachable,
ForOfStatement: reportIfUnreachable,
ForStatement: reportIfUnreachable,
IfStatement: reportIfUnreachable,
ImportDeclaration: reportIfUnreachable,
LabeledStatement: reportIfUnreachable,
ReturnStatement: reportIfUnreachable,
SwitchStatement: reportIfUnreachable,
ThrowStatement: reportIfUnreachable,
TryStatement: reportIfUnreachable,
VariableDeclaration(node) {
if (node.kind !== "var" || node.declarations.some(isInitialized)) {
reportIfUnreachable(node);
}
},
WhileStatement: reportIfUnreachable,
WithStatement: reportIfUnreachable,
ExportNamedDeclaration: reportIfUnreachable,
ExportDefaultDeclaration: reportIfUnreachable,
ExportAllDeclaration: reportIfUnreachable,
"Program:exit"() {
reportIfUnreachable();
}
};
}
};