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71 lines
2.3 KiB
71 lines
2.3 KiB
3 years ago
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/**
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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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*/
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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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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "disallow leading or trailing decimal points in numeric literals",
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category: "Best Practices",
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recommended: false,
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url: "https://eslint.org/docs/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.getSourceCode();
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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 = sourceCode.getTokenBefore(node);
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const needsSpaceBefore = tokenBefore &&
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tokenBefore.range[1] === node.range[0] &&
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!astUtils.canTokensBeAdjacent(tokenBefore, `0${node.raw}`);
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return fixer.insertTextBefore(node, needsSpaceBefore ? " 0" : "0");
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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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