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Original file line number | Diff line number | Diff line change |
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"use strict"; | ||
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var isValue = require("../object/is-value") | ||
, toNaturalNumber = require("../number/to-pos-integer"); | ||
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var generated = Object.create(null), random = Math.random, uniqTryLimit = 100; | ||
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var getChunk = function () { | ||
return random() | ||
.toString(36) | ||
.slice(2); | ||
}; | ||
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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); | ||
}; | ||
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module.exports = function (/* options */) { | ||
var options = Object(arguments[0]), length = options.length, isUnique = options.isUnique; | ||
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if (isValue(length)) length = toNaturalNumber(length); | ||
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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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Original file line number | Diff line number | Diff line change |
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"use strict"; | ||
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var isValidFormat = RegExp.prototype.test.bind(/^[a-z0-9]+$/); | ||
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module.exports = function (t, a) { | ||
a(typeof t(), "string"); | ||
a.ok(t().length > 7); | ||
a.not(t({ isUnique: true }), t({ isUnique: true })); | ||
a.ok(isValidFormat(t())); | ||
a(t({ length: 1 }).length, 1); | ||
a(t({ length: 100 }).length, 100); | ||
a(t({ length: 0 }), ""); | ||
}; |