2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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"use strict";
var isValue = require("../object/is-value")
, toNaturalNumber = require("../number/to-pos-integer");
var generated = Object.create(null), random = Math.random, uniqTryLimit = 100;
var getChunk = function () {
return random()
.toString(36)
.slice(2);
};
var getString = function (/* length */) {
var str = getChunk(), length = arguments[0];
if (!isValue(length)) return str;
while (str.length < length) str += getChunk();
return str.slice(0, length);
};
module.exports = function (/* options */) {
var options = Object(arguments[0]), length = options.length, isUnique = options.isUnique;
if (isValue(length)) length = toNaturalNumber(length);
var str = getString(length);
if (isUnique) {
var count = 0;
while (generated[str]) {
if (++count === uniqTryLimit) {
throw new Error(
"Cannot generate random string.\n" +
"String.random is not designed to effectively generate many short and " +
"unique random strings"
);
}
str = getString(length);
}
generated[str] = true;
}
return str;
};
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