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<h1>Module <code>pl.input</code></h1>
<p>Iterators for extracting words or numbers from an input source.</p>
<p>
<pre>
<span class="global">require</span> <span class="string">'pl'</span>
<span class="keyword">local</span> total,n = seq.sum(input.numbers())
<span class="global">print</span>(<span class="string">'average'</span>,total/n)
</pre>
<p> <em>source</em> is defined as a string or a file-like object (i.e. has a read() method which returns the next line)</p>
<p> See <a href="../manual/06-data.md.html#Reading_Unstructured_Text_Data">here</a></p>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a></p>
</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#alltokens">alltokens (getter, pattern[, fn])</a></td>
<td class="summary">create an iterator over all tokens.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#create_getter">create_getter (f)</a></td>
<td class="summary">create a function which grabs the next value from a source.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#numbers">numbers (f)</a></td>
<td class="summary">generate a sequence of numbers from a source.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#words">words (f)</a></td>
<td class="summary">generate a sequence of words from a source.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#fields">fields (ids, delim, f, opts)</a></td>
<td class="summary">parse an input source into fields.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "alltokens"></a>
<strong>alltokens (getter, pattern[, fn])</strong>
</dt>
<dd>
create an iterator over all tokens.
based on allwords from PiL, 7.1
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">getter</span>
<span class="types"><span class="type">func</span></span>
any function that returns a line of text
</li>
<li><span class="parameter">pattern</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
</li>
<li><span class="parameter">fn</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
Optionally can pass a function to process each token as it's found.
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
an iterator
</ol>
</dd>
<dt>
<a name = "create_getter"></a>
<strong>create_getter (f)</strong>
</dt>
<dd>
create a function which grabs the next value from a source. If the source is a string, then the getter
will return the string and thereafter return nil. If not specified then the source is assumed to be stdin.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">f</span>
a string or a file-like object (i.e. has a read() method which returns the next line)
</li>
</ul>
<h3>Returns:</h3>
<ol>
a getter function
</ol>
</dd>
<dt>
<a name = "numbers"></a>
<strong>numbers (f)</strong>
</dt>
<dd>
generate a sequence of numbers from a source.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">f</span>
A source
</li>
</ul>
<h3>Returns:</h3>
<ol>
An iterator
</ol>
</dd>
<dt>
<a name = "words"></a>
<strong>words (f)</strong>
</dt>
<dd>
generate a sequence of words from a source.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">f</span>
A source
</li>
</ul>
<h3>Returns:</h3>
<ol>
An iterator
</ol>
</dd>
<dt>
<a name = "fields"></a>
<strong>fields (ids, delim, f, opts)</strong>
</dt>
<dd>
parse an input source into fields.
By default, will fail if it cannot convert a field to a number.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">ids</span>
a list of field indices, or a maximum field index
</li>
<li><span class="parameter">delim</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
delimiter to parse fields (default space)
</li>
<li><span class="parameter">f</span>
a source @see create_getter
</li>
<li><span class="parameter">opts</span>
<span class="types"><span class="type">tab</span></span>
option table, <code>{no_fail=true}</code>
</li>
</ul>
<h3>Returns:</h3>
<ol>
an iterator with the field values
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">for</span> x,y <span class="keyword">in</span> fields {<span class="number">2</span>,<span class="number">3</span>} <span class="keyword">do</span> <span class="global">print</span>(x,y) <span class="keyword">end</span> <span class="comment">-- 2nd and 3rd fields from stdin</span></pre>
</ul>
</dd>
</dl>
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