eslint/lib/linter/code-path-analysis/id-generator.js

   1 /**
   2  * @fileoverview A class of identifiers generator for code path segments.
   3  *
   4  * Each rule uses the identifier of code path segments to store additional
   5  * information of the code path.
   6  *
   7  * @author Toru Nagashima
   8  */
   9
  10 "use strict";
  11
  12 //------------------------------------------------------------------------------
  13 // Public Interface
  14 //------------------------------------------------------------------------------
  15
  16 /**
  17  * A generator for unique ids.
  18  */
  19 class IdGenerator {
  20
  21     /**
  22      * @param {string} prefix Optional. A prefix of generated ids.
  23      */
  24     constructor(prefix) {
  25         this.prefix = String(prefix);
  26         this.n = 0;
  27     }
  28
  29     /**
  30      * Generates id.
  31      * @returns {string} A generated id.
  32      */
  33     next() {
  34         this.n = 1 + this.n | 0;
  35
  36         /* istanbul ignore if */
  37         if (this.n < 0) {
  38             this.n = 1;
  39         }
  40
  41         return this.prefix + this.n;
  42     }
  43 }
  44
  45 module.exports = IdGenerator;