146 lines
2.9 KiB
JavaScript
Executable File
146 lines
2.9 KiB
JavaScript
Executable File
/**
|
|
* @fileoverview Rule to flag bitwise identifiers
|
|
* @author Nicholas C. Zakas
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
/*
|
|
*
|
|
* Set of bitwise operators.
|
|
*
|
|
*/
|
|
const BITWISE_OPERATORS = [
|
|
"^",
|
|
"|",
|
|
"&",
|
|
"<<",
|
|
">>",
|
|
">>>",
|
|
"^=",
|
|
"|=",
|
|
"&=",
|
|
"<<=",
|
|
">>=",
|
|
">>>=",
|
|
"~",
|
|
];
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../types').Rule.RuleModule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "suggestion",
|
|
|
|
defaultOptions: [
|
|
{
|
|
allow: [],
|
|
int32Hint: false,
|
|
},
|
|
],
|
|
|
|
docs: {
|
|
description: "Disallow bitwise operators",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/no-bitwise",
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
allow: {
|
|
type: "array",
|
|
items: {
|
|
enum: BITWISE_OPERATORS,
|
|
},
|
|
uniqueItems: true,
|
|
},
|
|
int32Hint: {
|
|
type: "boolean",
|
|
},
|
|
},
|
|
additionalProperties: false,
|
|
},
|
|
],
|
|
|
|
messages: {
|
|
unexpected: "Unexpected use of '{{operator}}'.",
|
|
},
|
|
},
|
|
|
|
create(context) {
|
|
const [{ allow: allowed, int32Hint }] = context.options;
|
|
|
|
/**
|
|
* Reports an unexpected use of a bitwise operator.
|
|
* @param {ASTNode} node Node which contains the bitwise operator.
|
|
* @returns {void}
|
|
*/
|
|
function report(node) {
|
|
context.report({
|
|
node,
|
|
messageId: "unexpected",
|
|
data: { operator: node.operator },
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Checks if the given node has a bitwise operator.
|
|
* @param {ASTNode} node The node to check.
|
|
* @returns {boolean} Whether or not the node has a bitwise operator.
|
|
*/
|
|
function hasBitwiseOperator(node) {
|
|
return BITWISE_OPERATORS.includes(node.operator);
|
|
}
|
|
|
|
/**
|
|
* Checks if exceptions were provided, e.g. `{ allow: ['~', '|'] }`.
|
|
* @param {ASTNode} node The node to check.
|
|
* @returns {boolean} Whether or not the node has a bitwise operator.
|
|
*/
|
|
function allowedOperator(node) {
|
|
return allowed.includes(node.operator);
|
|
}
|
|
|
|
/**
|
|
* Checks if the given bitwise operator is used for integer typecasting, i.e. "|0"
|
|
* @param {ASTNode} node The node to check.
|
|
* @returns {boolean} whether the node is used in integer typecasting.
|
|
*/
|
|
function isInt32Hint(node) {
|
|
return (
|
|
int32Hint &&
|
|
node.operator === "|" &&
|
|
node.right &&
|
|
node.right.type === "Literal" &&
|
|
node.right.value === 0
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Report if the given node contains a bitwise operator.
|
|
* @param {ASTNode} node The node to check.
|
|
* @returns {void}
|
|
*/
|
|
function checkNodeForBitwiseOperator(node) {
|
|
if (
|
|
hasBitwiseOperator(node) &&
|
|
!allowedOperator(node) &&
|
|
!isInt32Hint(node)
|
|
) {
|
|
report(node);
|
|
}
|
|
}
|
|
|
|
return {
|
|
AssignmentExpression: checkNodeForBitwiseOperator,
|
|
BinaryExpression: checkNodeForBitwiseOperator,
|
|
UnaryExpression: checkNodeForBitwiseOperator,
|
|
};
|
|
},
|
|
};
|