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/**
* @fileoverview A class of identifiers generator for code path segments.
*
* Each rule uses the identifier of code path segments to store additional
* information of the code path.
*
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* A generator for unique ids.
*
* @constructor
* @param {string} prefix - Optional. A prefix of generated ids.
*/
function IdGenerator(prefix) {
this.prefix = String(prefix);
this.n = 0;
}
/**
* Generates id.
*
* @returns {string} A generated id.
*/
IdGenerator.prototype.next = function() {
this.n = 1 + this.n | 0;
/* istanbul ignore if */
if (this.n < 0) {
this.n = 1;
}
return this.prefix + this.n;
};
module.exports = IdGenerator;
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