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<h3>Table of Contents</h3>
<ul class="link-list" role="directory">
<li><a href="#module-IRB-label-Usage">Usage</a>
<li><a href="#module-IRB-label-Command+line+options">Command line options</a>
<li><a href="#module-IRB-label-Configuration">Configuration</a>
<li><a href="#module-IRB-label-Auto+indentation">Auto indentation</a>
<li><a href="#module-IRB-label-Autocompletion">Autocompletion</a>
<li><a href="#module-IRB-label-History">History</a>
<li><a href="#module-IRB-label-Customizing+the+IRB+Prompt">Customizing the IRB Prompt</a>
<li><a href="#module-IRB-label-Restrictions">Restrictions</a>
<li><a href="#module-IRB-label-IRB+Sessions">IRB Sessions</a>
<li><a href="#module-IRB-label-Commands">Commands</a>
<li><a href="#module-IRB-label-Configuration">Configuration</a>
<li><a href="#module-IRB-label-Session+variables">Session variables</a>
<li><a href="#module-IRB-label-Example+using+IRB+Sessions">Example using IRB Sessions</a>
</ul>
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<h3>Methods</h3>
<ul class="link-list" role="directory">
<li ><a href="#method-c-CurrentContext">::CurrentContext</a>
<li ><a href="#method-c-JobManager">::JobManager</a>
<li ><a href="#method-c-conf">::conf</a>
<li ><a href="#method-c-default_src_encoding">::default_src_encoding</a>
<li ><a href="#method-c-easter_egg">::easter_egg</a>
<li ><a href="#method-c-initialize_tracer">::initialize_tracer</a>
<li ><a href="#method-c-irb">::irb</a>
<li ><a href="#method-c-irb_abort">::irb_abort</a>
<li ><a href="#method-c-irb_at_exit">::irb_at_exit</a>
<li ><a href="#method-c-irb_exit">::irb_exit</a>
<li ><a href="#method-c-print_usage">::print_usage</a>
<li ><a href="#method-c-start">::start</a>
<li ><a href="#method-c-version">::version</a>
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<main role="main" aria-labelledby="module-IRB">
<h1 id="module-IRB" class="module">
module IRB
</h1>
<section class="description">
<p>IRB stands for “interactive Ruby” and is a tool to interactively execute Ruby expressions read from the standard input.</p>
<p>The <code>irb</code> command from your shell will start the interpreter.</p>
<h2 id="module-IRB-label-Usage">Usage<span><a href="#module-IRB-label-Usage">¶</a> <a href="#top">↑</a></span></h2>
<p>Use of irb is easy if you know Ruby.</p>
<p>When executing irb, prompts are displayed as follows. Then, enter the Ruby expression. An input is executed when it is syntactically complete.</p>
<pre>$ irb
irb(main):001:0> 1+2
#=> 3
irb(main):002:0> class Foo
irb(main):003:1> def foo
irb(main):004:2> print 1
irb(main):005:2> end
irb(main):006:1> end
#=> nil</pre>
<p>The singleline editor module or multiline editor module can be used with irb. Use of multiline editor is default if it's installed.</p>
<h2 id="module-IRB-label-Command+line+options">Command line options<span><a href="#module-IRB-label-Command+line+options">¶</a> <a href="#top">↑</a></span></h2>
<pre>Usage: irb.rb [options] [programfile] [arguments]
-f Suppress read of ~/.irbrc
-d Set $DEBUG to true (same as `ruby -d')
-r load-module Same as `ruby -r'
-I path Specify $LOAD_PATH directory
-U Same as `ruby -U`
-E enc Same as `ruby -E`
-w Same as `ruby -w`
-W[level=2] Same as `ruby -W`
--inspect Use `inspect' for output (default except for bc mode)
--noinspect Don't use inspect for output
--multiline Use multiline editor module
--nomultiline Don't use multiline editor module
--singleline Use singleline editor module
--nosingleline Don't use singleline editor module
--colorize Use colorization
--nocolorize Don't use colorization
--prompt prompt-mode
--prompt-mode prompt-mode
Switch prompt mode. Pre-defined prompt modes are
`default', `simple', `xmp' and `inf-ruby'
--inf-ruby-mode Use prompt appropriate for inf-ruby-mode on emacs.
Suppresses --multiline and --singleline.
--simple-prompt Simple prompt mode
--noprompt No prompt mode
--tracer Display trace for each execution of commands.
--back-trace-limit n
Display backtrace top n and tail n. The default
value is 16.
-v, --version Print the version of irb</pre>
<h2 id="module-IRB-label-Configuration">Configuration<span><a href="#module-IRB-label-Configuration">¶</a> <a href="#top">↑</a></span></h2>
<p>IRB reads from <code>~/.irbrc</code> when it's invoked.</p>
<p>If <code>~/.irbrc</code> doesn't exist, <code>irb</code> will try to read in the following order:</p>
<ul><li>
<p><code>.irbrc</code></p>
</li><li>
<p><code>irb.rc</code></p>
</li><li>
<p><code>_irbrc</code></p>
</li><li>
<p><code>$irbrc</code></p>
</li></ul>
<p>The following are alternatives to the command line options. To use them type as follows in an <code>irb</code> session:</p>
<pre>IRB.conf[:IRB_NAME]="irb"
IRB.conf[:INSPECT_MODE]=nil
IRB.conf[:IRB_RC] = nil
IRB.conf[:BACK_TRACE_LIMIT]=16
IRB.conf[:USE_LOADER] = false
IRB.conf[:USE_MULTILINE] = nil
IRB.conf[:USE_SINGLELINE] = nil
IRB.conf[:USE_COLORIZE] = true
IRB.conf[:USE_TRACER] = false
IRB.conf[:IGNORE_SIGINT] = true
IRB.conf[:IGNORE_EOF] = false
IRB.conf[:PROMPT_MODE] = :DEFAULT
IRB.conf[:PROMPT] = {...}</pre>
<h3 id="module-IRB-label-Auto+indentation">Auto indentation<span><a href="#module-IRB-label-Auto+indentation">¶</a> <a href="#top">↑</a></span></h3>
<p>To disable auto-indent mode in irb, add the following to your <code>.irbrc</code>:</p>
<pre class="ruby"><span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:AUTO_INDENT</span>] = <span class="ruby-keyword">false</span>
</pre>
<h3 id="module-IRB-label-Autocompletion">Autocompletion<span><a href="#module-IRB-label-Autocompletion">¶</a> <a href="#top">↑</a></span></h3>
<p>To enable autocompletion for irb, add the following to your <code>.irbrc</code>:</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'irb/completion'</span>
</pre>
<h3 id="module-IRB-label-History"><a href="IRB/History.html"><code>History</code></a><span><a href="#module-IRB-label-History">¶</a> <a href="#top">↑</a></span></h3>
<p>By default, irb will store the last 1000 commands you used in <code>IRB.conf[:HISTORY_FILE]</code> (<code>~/.irb_history</code> by default).</p>
<p>If you want to disable history, add the following to your <code>.irbrc</code>:</p>
<pre class="ruby"><span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:SAVE_HISTORY</span>] = <span class="ruby-keyword">nil</span>
</pre>
<p>See <a href="IRB/Context.html#method-i-save_history-3D"><code>IRB::Context#save_history=</code></a> for more information.</p>
<p>The history of <em>results</em> of commands evaluated is not stored by default, but can be turned on to be stored with this <code>.irbrc</code> setting:</p>
<pre>IRB.conf[:EVAL_HISTORY] = <number></pre>
<p>See <a href="IRB/Context.html#method-i-eval_history-3D"><code>IRB::Context#eval_history=</code></a> and <a href="IRB/History.html"><code>History</code></a> class. The history of command results is not permanently saved in any file.</p>
<h2 id="module-IRB-label-Customizing+the+IRB+Prompt">Customizing the IRB Prompt<span><a href="#module-IRB-label-Customizing+the+IRB+Prompt">¶</a> <a href="#top">↑</a></span></h2>
<p>In order to customize the prompt, you can change the following Hash:</p>
<pre class="ruby"><span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:PROMPT</span>]
</pre>
<p>This example can be used in your <code>.irbrc</code></p>
<pre class="ruby"><span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:PROMPT</span>][<span class="ruby-value">:MY_PROMPT</span>] = { <span class="ruby-comment"># name of prompt mode</span>
<span class="ruby-value">:AUTO_INDENT</span> <span class="ruby-operator">=></span> <span class="ruby-keyword">false</span>, <span class="ruby-comment"># disables auto-indent mode</span>
<span class="ruby-value">:PROMPT_I</span> <span class="ruby-operator">=></span> <span class="ruby-string">">> "</span>, <span class="ruby-comment"># simple prompt</span>
<span class="ruby-value">:PROMPT_S</span> <span class="ruby-operator">=></span> <span class="ruby-keyword">nil</span>, <span class="ruby-comment"># prompt for continuated strings</span>
<span class="ruby-value">:PROMPT_C</span> <span class="ruby-operator">=></span> <span class="ruby-keyword">nil</span>, <span class="ruby-comment"># prompt for continuated statement</span>
<span class="ruby-value">:RETURN</span> <span class="ruby-operator">=></span> <span class="ruby-string">" ==>%s\n"</span> <span class="ruby-comment"># format to return value</span>
}
<span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:PROMPT_MODE</span>] = <span class="ruby-value">:MY_PROMPT</span>
</pre>
<p>Or, invoke irb with the above prompt mode by:</p>
<pre>irb --prompt my-prompt</pre>
<p>Constants <code>PROMPT_I</code>, <code>PROMPT_S</code> and <code>PROMPT_C</code> specify the format. In the prompt specification, some special strings are available:</p>
<pre>%N # command name which is running
%m # to_s of main object (self)
%M # inspect of main object (self)
%l # type of string(", ', /, ]), `]' is inner %w[...]
%NNi # indent level. NN is digits and means as same as printf("%NNd").
# It can be omitted
%NNn # line number.
%% # %</pre>
<p>For instance, the default prompt mode is defined as follows:</p>
<pre class="ruby"><span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:PROMPT_MODE</span>][<span class="ruby-value">:DEFAULT</span>] = {
<span class="ruby-value">:PROMPT_I</span> <span class="ruby-operator">=></span> <span class="ruby-string">"%N(%m):%03n:%i> "</span>,
<span class="ruby-value">:PROMPT_N</span> <span class="ruby-operator">=></span> <span class="ruby-string">"%N(%m):%03n:%i> "</span>,
<span class="ruby-value">:PROMPT_S</span> <span class="ruby-operator">=></span> <span class="ruby-string">"%N(%m):%03n:%i%l "</span>,
<span class="ruby-value">:PROMPT_C</span> <span class="ruby-operator">=></span> <span class="ruby-string">"%N(%m):%03n:%i* "</span>,
<span class="ruby-value">:RETURN</span> <span class="ruby-operator">=></span> <span class="ruby-string">"%s\n"</span> <span class="ruby-comment"># used to printf</span>
}
</pre>
<p>irb comes with a number of available modes:</p>
<pre class="ruby"><span class="ruby-comment"># :NULL:</span>
<span class="ruby-comment"># :PROMPT_I:</span>
<span class="ruby-comment"># :PROMPT_N:</span>
<span class="ruby-comment"># :PROMPT_S:</span>
<span class="ruby-comment"># :PROMPT_C:</span>
<span class="ruby-comment"># :RETURN: |</span>
<span class="ruby-comment"># %s</span>
<span class="ruby-comment"># :DEFAULT:</span>
<span class="ruby-comment"># :PROMPT_I: ! '%N(%m):%03n:%i> '</span>
<span class="ruby-comment"># :PROMPT_N: ! '%N(%m):%03n:%i> '</span>
<span class="ruby-comment"># :PROMPT_S: ! '%N(%m):%03n:%i%l '</span>
<span class="ruby-comment"># :PROMPT_C: ! '%N(%m):%03n:%i* '</span>
<span class="ruby-comment"># :RETURN: |</span>
<span class="ruby-comment"># => %s</span>
<span class="ruby-comment"># :CLASSIC:</span>
<span class="ruby-comment"># :PROMPT_I: ! '%N(%m):%03n:%i> '</span>
<span class="ruby-comment"># :PROMPT_N: ! '%N(%m):%03n:%i> '</span>
<span class="ruby-comment"># :PROMPT_S: ! '%N(%m):%03n:%i%l '</span>
<span class="ruby-comment"># :PROMPT_C: ! '%N(%m):%03n:%i* '</span>
<span class="ruby-comment"># :RETURN: |</span>
<span class="ruby-comment"># %s</span>
<span class="ruby-comment"># :SIMPLE:</span>
<span class="ruby-comment"># :PROMPT_I: ! '>> '</span>
<span class="ruby-comment"># :PROMPT_N: ! '>> '</span>
<span class="ruby-comment"># :PROMPT_S:</span>
<span class="ruby-comment"># :PROMPT_C: ! '?> '</span>
<span class="ruby-comment"># :RETURN: |</span>
<span class="ruby-comment"># => %s</span>
<span class="ruby-comment"># :INF_RUBY:</span>
<span class="ruby-comment"># :PROMPT_I: ! '%N(%m):%03n:%i> '</span>
<span class="ruby-comment"># :PROMPT_N:</span>
<span class="ruby-comment"># :PROMPT_S:</span>
<span class="ruby-comment"># :PROMPT_C:</span>
<span class="ruby-comment"># :RETURN: |</span>
<span class="ruby-comment"># %s</span>
<span class="ruby-comment"># :AUTO_INDENT: true</span>
<span class="ruby-comment"># :XMP:</span>
<span class="ruby-comment"># :PROMPT_I:</span>
<span class="ruby-comment"># :PROMPT_N:</span>
<span class="ruby-comment"># :PROMPT_S:</span>
<span class="ruby-comment"># :PROMPT_C:</span>
<span class="ruby-comment"># :RETURN: |2</span>
<span class="ruby-comment"># ==>%s</span>
</pre>
<h2 id="module-IRB-label-Restrictions">Restrictions<span><a href="#module-IRB-label-Restrictions">¶</a> <a href="#top">↑</a></span></h2>
<p>Because irb evaluates input immediately after it is syntactically complete, the results may be slightly different than directly using Ruby.</p>
<h2 id="module-IRB-label-IRB+Sessions">IRB Sessions<span><a href="#module-IRB-label-IRB+Sessions">¶</a> <a href="#top">↑</a></span></h2>
<p>IRB has a special feature, that allows you to manage many sessions at once.</p>
<p>You can create new sessions with Irb.irb, and get a list of current sessions with the <code>jobs</code> command in the prompt.</p>
<h3 id="module-IRB-label-Commands">Commands<span><a href="#module-IRB-label-Commands">¶</a> <a href="#top">↑</a></span></h3>
<p><a href="IRB/JobManager.html"><code>JobManager</code></a> provides commands to handle the current sessions:</p>
<pre class="ruby"><span class="ruby-identifier">jobs</span> <span class="ruby-comment"># List of current sessions</span>
<span class="ruby-identifier">fg</span> <span class="ruby-comment"># Switches to the session of the given number</span>
<span class="ruby-identifier">kill</span> <span class="ruby-comment"># Kills the session with the given number</span>
</pre>
<p>The <code>exit</code> command, or <a href="IRB.html#method-c-irb_exit"><code>::irb_exit</code></a>, will quit the current session and call any exit hooks with <a href="IRB.html#method-c-irb_at_exit"><code>IRB.irb_at_exit</code></a>.</p>
<p>A few commands for loading files within the session are also available:</p>
<dl class="rdoc-list note-list"><dt><code>source</code>
<dd>
<p>Loads a given file in the current session and displays the source lines, see <a href="IRB/IrbLoader.html#method-i-source_file"><code>IrbLoader#source_file</code></a></p>
</dd><dt><code>irb_load</code>
<dd>
<p>Loads the given file similarly to <a href="Kernel.html#method-i-load"><code>Kernel#load</code></a>, see <a href="IRB/IrbLoader.html#method-i-irb_load"><code>IrbLoader#irb_load</code></a></p>
</dd><dt><code>irb_require</code>
<dd>
<p>Loads the given file similarly to <a href="Kernel.html#method-i-require"><code>Kernel#require</code></a></p>
</dd></dl>
<h3 id="module-IRB-label-Configuration">Configuration<span><a href="#module-IRB-label-Configuration">¶</a> <a href="#top">↑</a></span></h3>
<p>The command line options, or <a href="IRB.html#method-c-conf"><code>IRB.conf</code></a>, specify the default behavior of Irb.irb.</p>
<p>On the other hand, each conf in IRB is used to individually configure <a href="IRB.html#method-c-irb"><code>IRB.irb</code></a>.</p>
<p>If a proc is set for <code>IRB.conf[:IRB_RC]</code>, its will be invoked after execution of that proc with the context of the current session as its argument. Each session can be configured using this mechanism.</p>
<h3 id="module-IRB-label-Session+variables">Session variables<span><a href="#module-IRB-label-Session+variables">¶</a> <a href="#top">↑</a></span></h3>
<p>There are a few variables in every <a href="IRB/Irb.html"><code>Irb</code></a> session that can come in handy:</p>
<dl class="rdoc-list note-list"><dt><code>_</code>
<dd>
<p>The value command executed, as a local variable</p>
</dd><dt><code>__</code>
<dd>
<p>The history of evaluated commands. Available only if <code>IRB.conf[:EVAL_HISTORY]</code> is not <code>nil</code> (which is the default). See also <a href="IRB/Context.html#method-i-eval_history-3D"><code>IRB::Context#eval_history=</code></a> and <a href="IRB/History.html"><code>IRB::History</code></a>.</p>
</dd><dt><code>__[line_no]</code>
<dd>
<p>Returns the evaluation value at the given line number, <code>line_no</code>. If <code>line_no</code> is a negative, the return value <code>line_no</code> many lines before the most recent return value.</p>
</dd></dl>
<h3 id="module-IRB-label-Example+using+IRB+Sessions">Example using IRB Sessions<span><a href="#module-IRB-label-Example+using+IRB+Sessions">¶</a> <a href="#top">↑</a></span></h3>
<pre># invoke a new session
irb(main):001:0> irb
# list open sessions
irb.1(main):001:0> jobs
#0->irb on main (#<Thread:0x400fb7e4> : stop)
#1->irb#1 on main (#<Thread:0x40125d64> : running)
# change the active session
irb.1(main):002:0> fg 0
# define class Foo in top-level session
irb(main):002:0> class Foo;end
# invoke a new session with the context of Foo
irb(main):003:0> irb Foo
# define Foo#foo
irb.2(Foo):001:0> def foo
irb.2(Foo):002:1> print 1
irb.2(Foo):003:1> end
# change the active session
irb.2(Foo):004:0> fg 0
# list open sessions
irb(main):004:0> jobs
#0->irb on main (#<Thread:0x400fb7e4> : running)
#1->irb#1 on main (#<Thread:0x40125d64> : stop)
#2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
# check if Foo#foo is available
irb(main):005:0> Foo.instance_methods #=> [:foo, ...]
# change the active session
irb(main):006:0> fg 2
# define Foo#bar in the context of Foo
irb.2(Foo):005:0> def bar
irb.2(Foo):006:1> print "bar"
irb.2(Foo):007:1> end
irb.2(Foo):010:0> Foo.instance_methods #=> [:bar, :foo, ...]
# change the active session
irb.2(Foo):011:0> fg 0
irb(main):007:0> f = Foo.new #=> #<Foo:0x4010af3c>
# invoke a new session with the context of f (instance of Foo)
irb(main):008:0> irb f
# list open sessions
irb.3(<Foo:0x4010af3c>):001:0> jobs
#0->irb on main (#<Thread:0x400fb7e4> : stop)
#1->irb#1 on main (#<Thread:0x40125d64> : stop)
#2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
#3->irb#3 on #<Foo:0x4010af3c> (#<Thread:0x4010a1e0> : running)
# evaluate f.foo
irb.3(<Foo:0x4010af3c>):002:0> foo #=> 1 => nil
# evaluate f.bar
irb.3(<Foo:0x4010af3c>):003:0> bar #=> bar => nil
# kill jobs 1, 2, and 3
irb.3(<Foo:0x4010af3c>):004:0> kill 1, 2, 3
# list open sessions, should only include main session
irb(main):009:0> jobs
#0->irb on main (#<Thread:0x400fb7e4> : running)
# quit irb
irb(main):010:0> exit</pre>
<pre>save-history.rb -
$Release Version: 0.9.6$
$Revision$
by Keiju ISHITSUKA(keiju@ruby-lang.org)</pre>
<p>–</p>
<pre>frame.rb -
$Release Version: 0.9$
$Revision$
by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd)</pre>
<p>–</p>
<pre>output-method.rb - output methods used by irb
$Release Version: 0.9.6$
$Revision$
by Keiju ISHITSUKA(keiju@ruby-lang.org)</pre>
<p>–</p>
<p>DO NOT WRITE ANY MAGIC COMMENT HERE.</p>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section class="constants-list">
<header>
<h3>Constants</h3>
</header>
<dl>
<dt id="TracerLoadError">TracerLoadError
<dd>
</dl>
</section>
<section id="public-class-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Class Methods</h3>
</header>
<div id="method-c-CurrentContext" class="method-detail ">
<div class="method-heading">
<span class="method-name">CurrentContext</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>The current <a href="IRB/Context.html"><code>IRB::Context</code></a> of the session, see <a href="IRB.html#method-c-conf"><code>IRB.conf</code></a></p>
<pre>irb
irb(main):001:0> IRB.CurrentContext.irb_name = "foo"
foo(main):002:0> IRB.conf[:MAIN_CONTEXT].irb_name #=> "foo"</pre>
<div class="method-source-code" id="CurrentContext-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 384</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-constant">CurrentContext</span>
<span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">conf</span>[<span class="ruby-value">:MAIN_CONTEXT</span>]
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-JobManager" class="method-detail ">
<div class="method-heading">
<span class="method-name">JobManager</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>The current <a href="IRB/JobManager.html"><code>JobManager</code></a> in the session</p>
<div class="method-source-code" id="JobManager-source">
<pre><span class="ruby-comment"># File lib/irb/ext/multi-irb.rb, line 176</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-constant">JobManager</span>
<span class="ruby-ivar">@JobManager</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-conf" class="method-detail ">
<div class="method-heading">
<span class="method-name">conf</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Displays current configuration.</p>
<p>Modifying the configuration is achieved by sending a message to <a href="IRB.html#method-c-conf"><code>IRB.conf</code></a>.</p>
<p>See Configuration at <code>IRB</code> for more information.</p>
<div class="method-source-code" id="conf-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 367</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">conf</span>
<span class="ruby-ivar">@CONF</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-default_src_encoding" class="method-detail ">
<div class="method-heading">
<span class="method-name">default_src_encoding</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="default_src_encoding-source">
<pre><span class="ruby-comment"># File lib/irb/src_encoding.rb, line 4</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">default_src_encoding</span>
<span class="ruby-keyword">return</span> <span class="ruby-keyword">__ENCODING__</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-initialize_tracer" class="method-detail ">
<div class="method-heading">
<span class="method-name">initialize_tracer</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>initialize tracing function</p>
<div class="method-source-code" id="initialize_tracer-source">
<pre><span class="ruby-comment"># File lib/irb/ext/tracer.rb, line 30</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">initialize_tracer</span>
<span class="ruby-constant">Tracer</span>.<span class="ruby-identifier">verbose</span> = <span class="ruby-keyword">false</span>
<span class="ruby-constant">Tracer</span>.<span class="ruby-identifier">add_filter</span> {
<span class="ruby-operator">|</span><span class="ruby-identifier">event</span>, <span class="ruby-identifier">file</span>, <span class="ruby-identifier">line</span>, <span class="ruby-identifier">id</span>, <span class="ruby-identifier">binding</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">rests</span><span class="ruby-operator">|</span>
<span class="ruby-regexp">/^#{Regexp.quote(@CONF[:IRB_LIB_PATH])}/</span> <span class="ruby-operator">!~</span> <span class="ruby-identifier">file</span> <span class="ruby-keyword">and</span>
<span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-identifier">basename</span>(<span class="ruby-identifier">file</span>) <span class="ruby-operator">!=</span> <span class="ruby-string">"irb.rb"</span>
}
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-irb" class="method-detail ">
<div class="method-heading">
<span class="method-name">irb</span><span
class="method-args">(file = nil, *main)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Creates a new IRB session, see <a href="IRB/Irb.html#method-c-new"><code>Irb.new</code></a>.</p>
<p>The optional <code>file</code> argument is given to <a href="IRB/Context.html#method-c-new"><code>Context.new</code></a>, along with the workspace created with the remaining arguments, see <a href="IRB/WorkSpace.html#method-c-new"><code>WorkSpace.new</code></a></p>
<div class="method-source-code" id="irb-source">
<pre><span class="ruby-comment"># File lib/irb/ext/multi-irb.rb, line 189</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">irb</span>(<span class="ruby-identifier">file</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">main</span>)
<span class="ruby-identifier">workspace</span> = <span class="ruby-constant">WorkSpace</span>.<span class="ruby-identifier">new</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">main</span>)
<span class="ruby-identifier">parent_thread</span> = <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">current</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">start</span> <span class="ruby-keyword">do</span>
<span class="ruby-keyword">begin</span>
<span class="ruby-identifier">irb</span> = <span class="ruby-constant">Irb</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">workspace</span>, <span class="ruby-identifier">file</span>)
<span class="ruby-keyword">rescue</span>
<span class="ruby-identifier">print</span> <span class="ruby-string">"Subirb can't start with context(self): "</span>, <span class="ruby-identifier">workspace</span>.<span class="ruby-identifier">main</span>.<span class="ruby-identifier">inspect</span>, <span class="ruby-string">"\n"</span>
<span class="ruby-identifier">print</span> <span class="ruby-string">"return to main irb\n"</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">pass</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">main</span>.<span class="ruby-identifier">wakeup</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">exit</span>
<span class="ruby-keyword">end</span>
<span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:IRB_RC</span>].<span class="ruby-identifier">call</span>(<span class="ruby-identifier">irb</span>.<span class="ruby-identifier">context</span>) <span class="ruby-keyword">if</span> <span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:IRB_RC</span>]
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">insert</span>(<span class="ruby-identifier">irb</span>)
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">current_job</span> = <span class="ruby-identifier">irb</span>
<span class="ruby-keyword">begin</span>
<span class="ruby-identifier">system_exit</span> = <span class="ruby-keyword">false</span>
<span class="ruby-identifier">catch</span>(<span class="ruby-value">:IRB_EXIT</span>) <span class="ruby-keyword">do</span>
<span class="ruby-identifier">irb</span>.<span class="ruby-identifier">eval_input</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">rescue</span> <span class="ruby-constant">SystemExit</span>
<span class="ruby-identifier">system_exit</span> = <span class="ruby-keyword">true</span>
<span class="ruby-identifier">raise</span>
<span class="ruby-comment">#fail</span>
<span class="ruby-keyword">ensure</span>
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">system_exit</span>
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">irb</span>)
<span class="ruby-keyword">if</span> <span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">current_job</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">irb</span>
<span class="ruby-keyword">if</span> <span class="ruby-identifier">parent_thread</span>.<span class="ruby-identifier">alive?</span>
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">current_job</span> = <span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">irb</span>(<span class="ruby-identifier">parent_thread</span>)
<span class="ruby-identifier">parent_thread</span>.<span class="ruby-identifier">run</span>
<span class="ruby-keyword">else</span>
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">current_job</span> = <span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">main_irb</span>
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">main_thread</span>.<span class="ruby-identifier">run</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">stop</span>
<span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">current_job</span> = <span class="ruby-ivar">@JobManager</span>.<span class="ruby-identifier">irb</span>(<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">current</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-irb_abort" class="method-detail ">
<div class="method-heading">
<span class="method-name">irb_abort</span><span
class="method-args">(irb, exception = Abort)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Aborts then interrupts irb.</p>
<p>Will raise an <a href="IRB/Abort.html"><code>Abort</code></a> exception, or the given <code>exception</code>.</p>
<div class="method-source-code" id="irb_abort-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 416</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">irb_abort</span>(<span class="ruby-identifier">irb</span>, <span class="ruby-identifier">exception</span> = <span class="ruby-constant">Abort</span>)
<span class="ruby-keyword">if</span> <span class="ruby-keyword">defined?</span> <span class="ruby-constant">Thread</span>
<span class="ruby-identifier">irb</span>.<span class="ruby-identifier">context</span>.<span class="ruby-identifier">thread</span>.<span class="ruby-identifier">raise</span> <span class="ruby-identifier">exception</span>, <span class="ruby-string">"abort then interrupt!"</span>
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span> <span class="ruby-identifier">exception</span>, <span class="ruby-string">"abort then interrupt!"</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-irb_at_exit" class="method-detail ">
<div class="method-heading">
<span class="method-name">irb_at_exit</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Calls each event hook of <code>IRB.conf[:TA_EXIT]</code> when the current session quits.</p>
<div class="method-source-code" id="irb_at_exit-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 404</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">irb_at_exit</span>
<span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:AT_EXIT</span>].<span class="ruby-identifier">each</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">hook</span><span class="ruby-operator">|</span> <span class="ruby-identifier">hook</span>.<span class="ruby-identifier">call</span>}
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-irb_exit" class="method-detail ">
<div class="method-heading">
<span class="method-name">irb_exit</span><span
class="method-args">(irb, ret)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Quits irb</p>
<div class="method-source-code" id="irb_exit-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 409</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">irb_exit</span>(<span class="ruby-identifier">irb</span>, <span class="ruby-identifier">ret</span>)
<span class="ruby-identifier">throw</span> <span class="ruby-value">:IRB_EXIT</span>, <span class="ruby-identifier">ret</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-print_usage" class="method-detail ">
<div class="method-heading">
<span class="method-name">print_usage</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Outputs the irb help message, see Command line options at <code>IRB</code>.</p>
<div class="method-source-code" id="print_usage-source">
<pre><span class="ruby-comment"># File lib/irb/help.rb, line 17</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">print_usage</span>
<span class="ruby-identifier">lc</span> = <span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:LC_MESSAGES</span>]
<span class="ruby-identifier">path</span> = <span class="ruby-identifier">lc</span>.<span class="ruby-identifier">find</span>(<span class="ruby-string">"irb/help-message"</span>)
<span class="ruby-identifier">space_line</span> = <span class="ruby-keyword">false</span>
<span class="ruby-constant">IRB</span><span class="ruby-operator">::</span><span class="ruby-constant">MagicFile</span>.<span class="ruby-identifier">open</span>(<span class="ruby-identifier">path</span>){<span class="ruby-operator">|</span><span class="ruby-identifier">f</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">f</span>.<span class="ruby-identifier">each_line</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">l</span><span class="ruby-operator">|</span>
<span class="ruby-keyword">if</span> <span class="ruby-regexp">/^\s*$/</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">l</span>
<span class="ruby-identifier">lc</span>.<span class="ruby-identifier">puts</span> <span class="ruby-identifier">l</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">space_line</span>
<span class="ruby-identifier">space_line</span> = <span class="ruby-keyword">true</span>
<span class="ruby-keyword">next</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">space_line</span> = <span class="ruby-keyword">false</span>
<span class="ruby-identifier">l</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp">/#.*$/</span>, <span class="ruby-string">""</span>)
<span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-regexp">/^\s*$/</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">l</span>
<span class="ruby-identifier">lc</span>.<span class="ruby-identifier">puts</span> <span class="ruby-identifier">l</span>
<span class="ruby-keyword">end</span>
}
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-start" class="method-detail ">
<div class="method-heading">
<span class="method-name">start</span><span
class="method-args">(ap_path = nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Initializes IRB and creates a new Irb.irb object at the <code>TOPLEVEL_BINDING</code></p>
<div class="method-source-code" id="start-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 389</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">start</span>(<span class="ruby-identifier">ap_path</span> = <span class="ruby-keyword">nil</span>)
<span class="ruby-constant">STDOUT</span>.<span class="ruby-identifier">sync</span> = <span class="ruby-keyword">true</span>
<span class="ruby-identifier">$0</span> = <span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-identifier">basename</span>(<span class="ruby-identifier">ap_path</span>, <span class="ruby-string">".rb"</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">ap_path</span>
<span class="ruby-constant">IRB</span>.<span class="ruby-identifier">setup</span>(<span class="ruby-identifier">ap_path</span>)
<span class="ruby-keyword">if</span> <span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:SCRIPT</span>]
<span class="ruby-identifier">irb</span> = <span class="ruby-constant">Irb</span>.<span class="ruby-identifier">new</span>(<span class="ruby-keyword">nil</span>, <span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:SCRIPT</span>])
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">irb</span> = <span class="ruby-constant">Irb</span>.<span class="ruby-identifier">new</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">irb</span>.<span class="ruby-identifier">run</span>(<span class="ruby-ivar">@CONF</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-c-version" class="method-detail ">
<div class="method-heading">
<span class="method-name">version</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Returns the current version of IRB, including release version and last updated date.</p>
<div class="method-source-code" id="version-source">
<pre><span class="ruby-comment"># File lib/irb.rb, line 373</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">IRB</span>.<span class="ruby-identifier ruby-title">version</span>
<span class="ruby-keyword">if</span> <span class="ruby-identifier">v</span> = <span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:VERSION</span>] <span class="ruby-keyword">then</span> <span class="ruby-keyword">return</span> <span class="ruby-identifier">v</span> <span class="ruby-keyword">end</span>
<span class="ruby-ivar">@CONF</span>[<span class="ruby-value">:VERSION</span>] = <span class="ruby-identifier">format</span>(<span class="ruby-string">"irb %s (%s)"</span>, <span class="ruby-ivar">@RELEASE_VERSION</span>, <span class="ruby-ivar">@LAST_UPDATE_DATE</span>)
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
<section id="private-class-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Private Class Methods</h3>
</header>
<div id="method-c-easter_egg" class="method-detail ">
<div class="method-heading">
<span class="method-name">easter_egg</span><span
class="method-args">(type = nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="easter_egg-source">
<pre><span class="ruby-comment"># File lib/irb/easter-egg.rb, line 101</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">easter_egg</span>(<span class="ruby-identifier">type</span> = <span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">type</span> <span class="ruby-operator">||=</span> [<span class="ruby-value">:logo</span>, <span class="ruby-value">:dancing</span>].<span class="ruby-identifier">sample</span>
<span class="ruby-keyword">case</span> <span class="ruby-identifier">type</span>
<span class="ruby-keyword">when</span> <span class="ruby-value">:logo</span>
<span class="ruby-constant">File</span>.<span class="ruby-identifier">open</span>(<span class="ruby-constant">File</span>.<span class="ruby-identifier">join</span>(<span class="ruby-identifier">__dir__</span>, <span class="ruby-string">'ruby_logo.aa'</span>)) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">f</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">require</span> <span class="ruby-string">"rdoc"</span>
<span class="ruby-constant">RDoc</span><span class="ruby-operator">::</span><span class="ruby-constant">RI</span><span class="ruby-operator">::</span><span class="ruby-constant">Driver</span>.<span class="ruby-identifier">new</span>.<span class="ruby-identifier">page</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">io</span><span class="ruby-operator">|</span>
<span class="ruby-constant">IO</span>.<span class="ruby-identifier">copy_stream</span>(<span class="ruby-identifier">f</span>, <span class="ruby-identifier">io</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">when</span> <span class="ruby-value">:dancing</span>
<span class="ruby-keyword">begin</span>
<span class="ruby-identifier">canvas</span> = <span class="ruby-constant">Canvas</span>.<span class="ruby-identifier">new</span>(<span class="ruby-constant">Reline</span>.<span class="ruby-identifier">get_screen_size</span>)
<span class="ruby-constant">Reline</span><span class="ruby-operator">::</span><span class="ruby-constant">IOGate</span>.<span class="ruby-identifier">set_winch_handler</span> <span class="ruby-keyword">do</span>
<span class="ruby-identifier">canvas</span> = <span class="ruby-constant">Canvas</span>.<span class="ruby-identifier">new</span>(<span class="ruby-constant">Reline</span>.<span class="ruby-identifier">get_screen_size</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">ruby_model</span> = <span class="ruby-constant">RubyModel</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">print</span> <span class="ruby-string">"\e[?1049h"</span>
<span class="ruby-value">0</span>.<span class="ruby-identifier">step</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-comment"># TODO (0..).each needs Ruby 2.6 or later</span>
<span class="ruby-identifier">buff</span> = <span class="ruby-identifier">canvas</span>.<span class="ruby-identifier">draw</span> <span class="ruby-keyword">do</span>
<span class="ruby-identifier">ruby_model</span>.<span class="ruby-identifier">render_frame</span>(<span class="ruby-identifier">i</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">p1</span>, <span class="ruby-identifier">p2</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">canvas</span>.<span class="ruby-identifier">line</span>(<span class="ruby-identifier">p1</span>, <span class="ruby-identifier">p2</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">buff</span>[<span class="ruby-value">0</span>, <span class="ruby-value">20</span>] = <span class="ruby-string">"\e[0mPress Ctrl+C to stop\e[31m\e[1m"</span>
<span class="ruby-identifier">print</span> <span class="ruby-string">"\e[H"</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">buff</span>
<span class="ruby-identifier">sleep</span> <span class="ruby-value">0.05</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">ensure</span>
<span class="ruby-identifier">print</span> <span class="ruby-string">"\e[0m\e[?1049l"</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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