File: C:/Ruby27-x64/share/doc/ruby/html/Random/Formatter.html
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<!-- Method Quickref -->
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<h3>Methods</h3>
<ul class="link-list" role="directory">
<li ><a href="#method-i-alphanumeric">#alphanumeric</a>
<li ><a href="#method-i-base64">#base64</a>
<li ><a href="#method-i-choose">#choose</a>
<li ><a href="#method-i-gen_random">#gen_random</a>
<li ><a href="#method-i-hex">#hex</a>
<li ><a href="#method-i-rand">#rand</a>
<li ><a href="#method-i-random_bytes">#random_bytes</a>
<li ><a href="#method-i-random_number">#random_number</a>
<li ><a href="#method-i-urlsafe_base64">#urlsafe_base64</a>
<li ><a href="#method-i-uuid">#uuid</a>
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<main role="main" aria-labelledby="module-Random::Formatter">
<h1 id="module-Random::Formatter" class="module">
module Random::Formatter
</h1>
<section class="description">
<p>Format raw random number as <a href="../Random.html"><code>Random</code></a> does</p>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section class="constants-list">
<header>
<h3>Constants</h3>
</header>
<dl>
<dt id="ALPHANUMERIC">ALPHANUMERIC
<dd>
</dl>
</section>
<section id="public-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Instance Methods</h3>
</header>
<div id="method-i-alphanumeric" class="method-detail ">
<div class="method-heading">
<span class="method-name">alphanumeric</span><span
class="method-args">(n=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.alphanumeric generates a random alphanumeric string.</p>
<p>The argument <em>n</em> specifies the length, in characters, of the alphanumeric string to be generated.</p>
<p>If <em>n</em> is not specified or is nil, 16 is assumed. It may be larger in the future.</p>
<p>The result may contain A-Z, a-z and 0-9.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">alphanumeric</span> <span class="ruby-comment">#=> "2BuBuLf3WfSKyQbR"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">alphanumeric</span>(<span class="ruby-value">10</span>) <span class="ruby-comment">#=> "i6K93NdqiH"</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<div class="method-source-code" id="alphanumeric-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 326</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">alphanumeric</span>(<span class="ruby-identifier">n</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">n</span> = <span class="ruby-value">16</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">n</span>.<span class="ruby-identifier">nil?</span>
<span class="ruby-identifier">choose</span>(<span class="ruby-constant">ALPHANUMERIC</span>, <span class="ruby-identifier">n</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-base64" class="method-detail ">
<div class="method-heading">
<span class="method-name">base64</span><span
class="method-args">(n=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.base64 generates a random base64 string.</p>
<p>The argument <em>n</em> specifies the length, in bytes, of the random number to be generated. The length of the result string is about 4/3 of <em>n</em>.</p>
<p>If <em>n</em> is not specified or is nil, 16 is assumed. It may be larger in the future.</p>
<p>The result may contain A-Z, a-z, 0-9, “+”, “/” and “=”.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">base64</span> <span class="ruby-comment">#=> "/2BuBuLf3+WfSKyQbRcc/A=="</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">base64</span> <span class="ruby-comment">#=> "6BbW0pxO0YENxn38HMUbcQ=="</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<p>See RFC 3548 for the definition of base64.</p>
<div class="method-source-code" id="base64-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 197</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">base64</span>(<span class="ruby-identifier">n</span>=<span class="ruby-keyword">nil</span>)
[<span class="ruby-identifier">random_bytes</span>(<span class="ruby-identifier">n</span>)].<span class="ruby-identifier">pack</span>(<span class="ruby-string">"m0"</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-hex" class="method-detail ">
<div class="method-heading">
<span class="method-name">hex</span><span
class="method-args">(n=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.hex generates a random hexadecimal string.</p>
<p>The argument <em>n</em> specifies the length, in bytes, of the random number to be generated. The length of the resulting hexadecimal string is twice of <em>n</em>.</p>
<p>If <em>n</em> is not specified or is nil, 16 is assumed. It may be larger in the future.</p>
<p>The result may contain 0-9 and a-f.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">hex</span> <span class="ruby-comment">#=> "eb693ec8252cd630102fd0d0fb7c3485"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">hex</span> <span class="ruby-comment">#=> "91dc3bfb4de5b11d029d376634589b61"</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<div class="method-source-code" id="hex-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 174</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">hex</span>(<span class="ruby-identifier">n</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">random_bytes</span>(<span class="ruby-identifier">n</span>).<span class="ruby-identifier">unpack</span>(<span class="ruby-string">"H*"</span>)[<span class="ruby-value">0</span>]
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-rand" class="method-detail ">
<div class="method-heading">
<span class="method-callseq">
random_number → float
</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-heading">
<span class="method-callseq">
random_number(max) → number
</span>
</div>
<div class="method-heading">
<span class="method-callseq">
rand → float
</span>
</div>
<div class="method-heading">
<span class="method-callseq">
rand(max) → number
</span>
</div>
<div class="method-description">
<p>Generates formatted random number from raw random bytes. See <a href="../Random.html#method-i-rand"><code>Random#rand</code></a>.</p>
<div class="method-source-code" id="rand-source">
<pre>static VALUE
rand_random_number(int argc, VALUE *argv, VALUE obj)
{
rb_random_t *rnd = try_get_rnd(obj);
VALUE v = rand_random(argc, argv, obj, rnd);
if (NIL_P(v)) v = rand_random(0, 0, obj, rnd);
else if (!v) invalid_argument(argv[0]);
return v;
}</pre>
</div>
</div>
</div>
<div id="method-i-random_bytes" class="method-detail ">
<div class="method-heading">
<span class="method-name">random_bytes</span><span
class="method-args">(n=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.random_bytes generates a random binary string.</p>
<p>The argument <em>n</em> specifies the length of the result string.</p>
<p>If <em>n</em> is not specified or is nil, 16 is assumed. It may be larger in future.</p>
<p>The result may contain any byte: “x00” - “xff”.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">random_bytes</span> <span class="ruby-comment">#=> "\xD8\\\xE0\xF4\r\xB2\xFC*WM\xFF\x83\x18\xF45\xB6"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">random_bytes</span> <span class="ruby-comment">#=> "m\xDC\xFC/\a\x00Uf\xB2\xB2P\xBD\xFF6S\x97"</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<div class="method-source-code" id="random_bytes-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 152</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">random_bytes</span>(<span class="ruby-identifier">n</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">n</span> = <span class="ruby-identifier">n</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">n</span>.<span class="ruby-identifier">to_int</span> <span class="ruby-operator">:</span> <span class="ruby-value">16</span>
<span class="ruby-identifier">gen_random</span>(<span class="ruby-identifier">n</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-random_number" class="method-detail ">
<div class="method-heading">
<span class="method-callseq">
random_number → float
</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-heading">
<span class="method-callseq">
random_number(max) → number
</span>
</div>
<div class="method-description">
<p>Generates formatted random number from raw random bytes. See <a href="../Random.html#method-i-rand"><code>Random#rand</code></a>.</p>
<div class="method-source-code" id="random_number-source">
<pre>static VALUE
rand_random_number(int argc, VALUE *argv, VALUE obj)
{
rb_random_t *rnd = try_get_rnd(obj);
VALUE v = rand_random(argc, argv, obj, rnd);
if (NIL_P(v)) v = rand_random(0, 0, obj, rnd);
else if (!v) invalid_argument(argv[0]);
return v;
}</pre>
</div>
</div>
</div>
<div id="method-i-urlsafe_base64" class="method-detail ">
<div class="method-heading">
<span class="method-name">urlsafe_base64</span><span
class="method-args">(n=nil, padding=false)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.urlsafe_base64 generates a random URL-safe base64 string.</p>
<p>The argument <em>n</em> specifies the length, in bytes, of the random number to be generated. The length of the result string is about 4/3 of <em>n</em>.</p>
<p>If <em>n</em> is not specified or is nil, 16 is assumed. It may be larger in the future.</p>
<p>The boolean argument <em>padding</em> specifies the padding. If it is false or nil, padding is not generated. Otherwise padding is generated. By default, padding is not generated because “=” may be used as a URL delimiter.</p>
<p>The result may contain A-Z, a-z, 0-9, “-” and “_”. “=” is also used if <em>padding</em> is true.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">urlsafe_base64</span> <span class="ruby-comment">#=> "b4GOKm4pOYU_-BOXcrUGDg"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">urlsafe_base64</span> <span class="ruby-comment">#=> "UZLdOkzop70Ddx-IJR0ABg"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">urlsafe_base64</span>(<span class="ruby-keyword">nil</span>, <span class="ruby-keyword">true</span>) <span class="ruby-comment">#=> "i0XQ-7gglIsHGV2_BNPrdQ=="</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">urlsafe_base64</span>(<span class="ruby-keyword">nil</span>, <span class="ruby-keyword">true</span>) <span class="ruby-comment">#=> "-M8rLhr7JEpJlqFGUMmOxg=="</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<p>See RFC 3548 for the definition of URL-safe base64.</p>
<div class="method-source-code" id="urlsafe_base64-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 229</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">urlsafe_base64</span>(<span class="ruby-identifier">n</span>=<span class="ruby-keyword">nil</span>, <span class="ruby-identifier">padding</span>=<span class="ruby-keyword">false</span>)
<span class="ruby-identifier">s</span> = [<span class="ruby-identifier">random_bytes</span>(<span class="ruby-identifier">n</span>)].<span class="ruby-identifier">pack</span>(<span class="ruby-string">"m0"</span>)
<span class="ruby-identifier">s</span>.<span class="ruby-identifier">tr!</span>(<span class="ruby-string">"+/"</span>, <span class="ruby-string">"-_"</span>)
<span class="ruby-identifier">s</span>.<span class="ruby-identifier">delete!</span>(<span class="ruby-string">"="</span>) <span class="ruby-keyword">unless</span> <span class="ruby-identifier">padding</span>
<span class="ruby-identifier">s</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-uuid" class="method-detail ">
<div class="method-heading">
<span class="method-name">uuid</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.uuid generates a random v4 UUID (Universally Unique IDentifier).</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">uuid</span> <span class="ruby-comment">#=> "2d931510-d99f-494a-8c67-87feb05e1594"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">uuid</span> <span class="ruby-comment">#=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">uuid</span> <span class="ruby-comment">#=> "62936e70-1815-439b-bf89-8492855a7e6b"</span>
</pre>
<p>The version 4 UUID is purely random (except the version). It doesn't contain meaningful information such as MAC addresses, timestamps, etc.</p>
<p>The result contains 122 random bits (15.25 random bytes).</p>
<p>See RFC 4122 for details of UUID.</p>
<div class="method-source-code" id="uuid-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 251</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">uuid</span>
<span class="ruby-identifier">ary</span> = <span class="ruby-identifier">random_bytes</span>(<span class="ruby-value">16</span>).<span class="ruby-identifier">unpack</span>(<span class="ruby-string">"NnnnnN"</span>)
<span class="ruby-identifier">ary</span>[<span class="ruby-value">2</span>] = (<span class="ruby-identifier">ary</span>[<span class="ruby-value">2</span>] <span class="ruby-operator">&</span> <span class="ruby-value">0x0fff</span>) <span class="ruby-operator">|</span> <span class="ruby-value">0x4000</span>
<span class="ruby-identifier">ary</span>[<span class="ruby-value">3</span>] = (<span class="ruby-identifier">ary</span>[<span class="ruby-value">3</span>] <span class="ruby-operator">&</span> <span class="ruby-value">0x3fff</span>) <span class="ruby-operator">|</span> <span class="ruby-value">0x8000</span>
<span class="ruby-string">"%08x-%04x-%04x-%04x-%04x%08x"</span> <span class="ruby-operator">%</span> <span class="ruby-identifier">ary</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
<section id="private-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Private Instance Methods</h3>
</header>
<div id="method-i-choose" class="method-detail ">
<div class="method-heading">
<span class="method-name">choose</span><span
class="method-args">(source, n)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>SecureRandom.choose generates a string that randomly draws from a source array of characters.</p>
<p>The argument <em>source</em> specifies the array of characters from which to generate the string. The argument <em>n</em> specifies the length, in characters, of the string to be generated.</p>
<p>The result may contain whatever characters are in the source array.</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'securerandom'</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">choose</span>([<span class="ruby-operator">*</span><span class="ruby-string">'l'</span><span class="ruby-operator">..</span><span class="ruby-string">'r'</span>], <span class="ruby-value">16</span>) <span class="ruby-comment">#=> "lmrqpoonmmlqlron"</span>
<span class="ruby-constant">SecureRandom</span>.<span class="ruby-identifier">choose</span>([<span class="ruby-operator">*</span><span class="ruby-string">'0'</span><span class="ruby-operator">..</span><span class="ruby-string">'9'</span>], <span class="ruby-value">5</span>) <span class="ruby-comment">#=> "27309"</span>
</pre>
<p>If a secure random number generator is not available, <code>NotImplementedError</code> is raised.</p>
<div class="method-source-code" id="choose-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 279</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">choose</span>(<span class="ruby-identifier">source</span>, <span class="ruby-identifier">n</span>)
<span class="ruby-identifier">size</span> = <span class="ruby-identifier">source</span>.<span class="ruby-identifier">size</span>
<span class="ruby-identifier">m</span> = <span class="ruby-value">1</span>
<span class="ruby-identifier">limit</span> = <span class="ruby-identifier">size</span>
<span class="ruby-keyword">while</span> <span class="ruby-identifier">limit</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">size</span> <span class="ruby-operator"><=</span> <span class="ruby-value">0x100000000</span>
<span class="ruby-identifier">limit</span> <span class="ruby-operator">*=</span> <span class="ruby-identifier">size</span>
<span class="ruby-identifier">m</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">result</span> = <span class="ruby-string">''</span>.<span class="ruby-identifier">dup</span>
<span class="ruby-keyword">while</span> <span class="ruby-identifier">m</span> <span class="ruby-operator"><=</span> <span class="ruby-identifier">n</span>
<span class="ruby-identifier">rs</span> = <span class="ruby-identifier">random_number</span>(<span class="ruby-identifier">limit</span>)
<span class="ruby-identifier">is</span> = <span class="ruby-identifier">rs</span>.<span class="ruby-identifier">digits</span>(<span class="ruby-identifier">size</span>)
(<span class="ruby-identifier">m</span><span class="ruby-operator">-</span><span class="ruby-identifier">is</span>.<span class="ruby-identifier">length</span>).<span class="ruby-identifier">times</span> { <span class="ruby-identifier">is</span> <span class="ruby-operator"><<</span> <span class="ruby-value">0</span> }
<span class="ruby-identifier">result</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">source</span>.<span class="ruby-identifier">values_at</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">is</span>).<span class="ruby-identifier">join</span>(<span class="ruby-string">''</span>)
<span class="ruby-identifier">n</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">m</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">if</span> <span class="ruby-value">0</span> <span class="ruby-operator"><</span> <span class="ruby-identifier">n</span>
<span class="ruby-identifier">rs</span> = <span class="ruby-identifier">random_number</span>(<span class="ruby-identifier">limit</span>)
<span class="ruby-identifier">is</span> = <span class="ruby-identifier">rs</span>.<span class="ruby-identifier">digits</span>(<span class="ruby-identifier">size</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">is</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator"><</span> <span class="ruby-identifier">n</span>
(<span class="ruby-identifier">n</span><span class="ruby-operator">-</span><span class="ruby-identifier">is</span>.<span class="ruby-identifier">length</span>).<span class="ruby-identifier">times</span> { <span class="ruby-identifier">is</span> <span class="ruby-operator"><<</span> <span class="ruby-value">0</span> }
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">is</span>.<span class="ruby-identifier">pop</span> <span class="ruby-keyword">while</span> <span class="ruby-identifier">n</span> <span class="ruby-operator"><</span> <span class="ruby-identifier">is</span>.<span class="ruby-identifier">length</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">result</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">source</span>.<span class="ruby-identifier">values_at</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">is</span>).<span class="ruby-identifier">join</span>(<span class="ruby-string">''</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">result</span>
<span class="ruby-keyword">end</span></pre>
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<div id="method-i-gen_random" class="method-detail ">
<div class="method-heading">
<span class="method-name">gen_random</span><span
class="method-args">(n)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="gen_random-source">
<pre><span class="ruby-comment"># File lib/securerandom.rb, line 258</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">gen_random</span>(<span class="ruby-identifier">n</span>)
<span class="ruby-keyword">self</span>.<span class="ruby-identifier">bytes</span>(<span class="ruby-identifier">n</span>)
<span class="ruby-keyword">end</span></pre>
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