114 lines
3.7 KiB
JavaScript
114 lines
3.7 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview Rule to disallow `parseInt()` in favor of binary, octal, and hexadecimal literals
|
||
|
|
* @author Annie Zhang, Henry Zhu
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Helpers
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks to see if a CallExpression's callee node is `parseInt` or
|
||
|
|
* `Number.parseInt`.
|
||
|
|
* @param {ASTNode} calleeNode The callee node to evaluate.
|
||
|
|
* @returns {boolean} True if the callee is `parseInt` or `Number.parseInt`,
|
||
|
|
* false otherwise.
|
||
|
|
*/
|
||
|
|
function isParseInt(calleeNode) {
|
||
|
|
switch (calleeNode.type) {
|
||
|
|
case "Identifier":
|
||
|
|
return calleeNode.name === "parseInt";
|
||
|
|
case "MemberExpression":
|
||
|
|
return calleeNode.object.type === "Identifier" &&
|
||
|
|
calleeNode.object.name === "Number" &&
|
||
|
|
calleeNode.property.type === "Identifier" &&
|
||
|
|
calleeNode.property.name === "parseInt";
|
||
|
|
|
||
|
|
// no default
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
docs: {
|
||
|
|
description: "disallow `parseInt()` and `Number.parseInt()` in favor of binary, octal, and hexadecimal literals",
|
||
|
|
category: "ECMAScript 6",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/prefer-numeric-literals"
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: [],
|
||
|
|
|
||
|
|
fixable: "code"
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
const sourceCode = context.getSourceCode();
|
||
|
|
|
||
|
|
const radixMap = {
|
||
|
|
2: "binary",
|
||
|
|
8: "octal",
|
||
|
|
16: "hexadecimal"
|
||
|
|
};
|
||
|
|
|
||
|
|
const prefixMap = {
|
||
|
|
2: "0b",
|
||
|
|
8: "0o",
|
||
|
|
16: "0x"
|
||
|
|
};
|
||
|
|
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
// Public
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
|
||
|
|
return {
|
||
|
|
|
||
|
|
CallExpression(node) {
|
||
|
|
|
||
|
|
// doesn't check parseInt() if it doesn't have a radix argument
|
||
|
|
if (node.arguments.length !== 2) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// only error if the radix is 2, 8, or 16
|
||
|
|
const radixName = radixMap[node.arguments[1].value];
|
||
|
|
|
||
|
|
if (isParseInt(node.callee) &&
|
||
|
|
radixName &&
|
||
|
|
node.arguments[0].type === "Literal"
|
||
|
|
) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
message: "Use {{radixName}} literals instead of {{functionName}}().",
|
||
|
|
data: {
|
||
|
|
radixName,
|
||
|
|
functionName: sourceCode.getText(node.callee)
|
||
|
|
},
|
||
|
|
fix(fixer) {
|
||
|
|
const newPrefix = prefixMap[node.arguments[1].value];
|
||
|
|
|
||
|
|
if (+(newPrefix + node.arguments[0].value) !== parseInt(node.arguments[0].value, node.arguments[1].value)) {
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If the newly-produced literal would be invalid, (e.g. 0b1234),
|
||
|
|
* or it would yield an incorrect parseInt result for some other reason, don't make a fix.
|
||
|
|
*/
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
return fixer.replaceText(node, prefixMap[node.arguments[1].value] + node.arguments[0].value);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|