no-floating-decimal.js
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/**
* @fileoverview Rule to flag use of a leading/trailing decimal point in a numeric literal
* @author James Allardice
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "disallow leading or trailing decimal points in numeric literals",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/no-floating-decimal"
},
schema: [],
fixable: "code",
messages: {
leading: "A leading decimal point can be confused with a dot.",
trailing: "A trailing decimal point can be confused with a dot."
}
},
create(context) {
const sourceCode = context.getSourceCode();
return {
Literal(node) {
if (typeof node.value === "number") {
if (node.raw.startsWith(".")) {
context.report({
node,
messageId: "leading",
fix(fixer) {
const tokenBefore = sourceCode.getTokenBefore(node);
const needsSpaceBefore = tokenBefore &&
tokenBefore.range[1] === node.range[0] &&
!astUtils.canTokensBeAdjacent(tokenBefore, `0${node.raw}`);
return fixer.insertTextBefore(node, needsSpaceBefore ? " 0" : "0");
}
});
}
if (node.raw.indexOf(".") === node.raw.length - 1) {
context.report({
node,
messageId: "trailing",
fix: fixer => fixer.insertTextAfter(node, "0")
});
}
}
}
};
}
};