.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/rules/no-floating-decimal.js

   1 /**
   2  * @fileoverview Rule to flag use of a leading/trailing decimal point in a numeric literal
   3  * @author James Allardice
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const astUtils = require("./utils/ast-utils");
  13
  14 //------------------------------------------------------------------------------
  15 // Rule Definition
  16 //------------------------------------------------------------------------------
  17
  18 module.exports = {
  19     meta: {
  20         type: "suggestion",
  21
  22         docs: {
  23             description: "disallow leading or trailing decimal points in numeric literals",
  24             category: "Best Practices",
  25             recommended: false,
  26             url: "https://eslint.org/docs/rules/no-floating-decimal"
  27         },
  28
  29         schema: [],
  30         fixable: "code",
  31         messages: {
  32             leading: "A leading decimal point can be confused with a dot.",
  33             trailing: "A trailing decimal point can be confused with a dot."
  34         }
  35     },
  36
  37     create(context) {
  38         const sourceCode = context.getSourceCode();
  39
  40         return {
  41             Literal(node) {
  42
  43                 if (typeof node.value === "number") {
  44                     if (node.raw.startsWith(".")) {
  45                         context.report({
  46                             node,
  47                             messageId: "leading",
  48                             fix(fixer) {
  49                                 const tokenBefore = sourceCode.getTokenBefore(node);
  50                                 const needsSpaceBefore = tokenBefore &&
  51                                     tokenBefore.range[1] === node.range[0] &&
  52                                     !astUtils.canTokensBeAdjacent(tokenBefore, `0${node.raw}`);
  53
  54                                 return fixer.insertTextBefore(node, needsSpaceBefore ? " 0" : "0");
  55                             }
  56                         });
  57                     }
  58                     if (node.raw.indexOf(".") === node.raw.length - 1) {
  59                         context.report({
  60                             node,
  61                             messageId: "trailing",
  62                             fix: fixer => fixer.insertTextAfter(node, "0")
  63                         });
  64                     }
  65                 }
  66             }
  67         };
  68
  69     }
  70 };