100 lines
2.5 KiB
JavaScript
100 lines
2.5 KiB
JavaScript
/**
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* @fileoverview Rule to flag use of a leading/trailing decimal point in a numeric literal
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* @author James Allardice
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* @deprecated in ESLint v8.53.0
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../types').Rule.RuleModule} */
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module.exports = {
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meta: {
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deprecated: {
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message: "Formatting rules are being moved out of ESLint core.",
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url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
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deprecatedSince: "8.53.0",
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availableUntil: "10.0.0",
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replacedBy: [
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{
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message:
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"ESLint Stylistic now maintains deprecated stylistic core rules.",
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url: "https://eslint.style/guide/migration",
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plugin: {
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name: "@stylistic/eslint-plugin-js",
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url: "https://eslint.style/packages/js",
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},
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rule: {
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name: "no-floating-decimal",
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url: "https://eslint.style/rules/js/no-floating-decimal",
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},
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},
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],
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},
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type: "suggestion",
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docs: {
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description:
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"Disallow leading or trailing decimal points in numeric literals",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/no-floating-decimal",
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},
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schema: [],
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fixable: "code",
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messages: {
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leading: "A leading decimal point can be confused with a dot.",
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trailing: "A trailing decimal point can be confused with a dot.",
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},
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},
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create(context) {
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const sourceCode = context.sourceCode;
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return {
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Literal(node) {
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if (typeof node.value === "number") {
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if (node.raw.startsWith(".")) {
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context.report({
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node,
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messageId: "leading",
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fix(fixer) {
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const tokenBefore =
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sourceCode.getTokenBefore(node);
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const needsSpaceBefore =
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tokenBefore &&
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tokenBefore.range[1] === node.range[0] &&
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!astUtils.canTokensBeAdjacent(
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tokenBefore,
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`0${node.raw}`,
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);
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return fixer.insertTextBefore(
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node,
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needsSpaceBefore ? " 0" : "0",
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);
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},
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});
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}
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if (node.raw.indexOf(".") === node.raw.length - 1) {
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context.report({
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node,
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messageId: "trailing",
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fix: fixer => fixer.insertTextAfter(node, "0"),
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});
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}
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}
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},
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};
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},
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};
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