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<title>Stream</title>
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<center><h1>Module <a href="type_Stream.html">Stream</a></h1></center>
<br>
<pre><span class="keyword">module</span> Stream: <code class="code"><span class="keyword">sig</span></code> <a href="Stream.html">..</a> <code class="code"><span class="keyword">end</span></code></pre>Streams and parsers.<br>
<hr width="100%">
<pre><span class="keyword">type</span> <a name="TYPEt"></a><code class="type">'a</code> t </pre>
<div class="info">
The type of streams holding values of type <code class="code"><span class="keywordsign">'</span>a</code>.<br>
</div>
<pre><span class="keyword">exception</span> <a name="EXCEPTIONFailure"></a>Failure</pre>
<div class="info">
Raised by parsers when none of the first components of the stream
patterns is accepted.<br>
</div>
<pre><span class="keyword">exception</span> <a name="EXCEPTIONError"></a>Error <span class="keyword">of</span> <code class="type">string</code></pre>
<div class="info">
Raised by parsers when the first component of a stream pattern is
accepted, but one of the following components is rejected.<br>
</div>
<br>
<a name="6_Streambuilders"></a>
<h6>Stream builders</h6>
<p>
Warning: these functions create streams with fast access; it is illegal
to mix them with streams built with <code class="code">[< >]</code>; would raise <code class="code"><span class="constructor">Failure</span></code>
when accessing such mixed streams.<br>
<pre><span class="keyword">val</span> <a name="VALfrom"></a>from : <code class="type">(int -> 'a option) -> 'a <a href="Stream.html#TYPEt">t</a></code></pre><div class="info">
<code class="code"><span class="constructor">Stream</span>.from f</code> returns a stream built from the function <code class="code">f</code>.
To create a new stream element, the function <code class="code">f</code> is called with
the current stream count. The user function <code class="code">f</code> must return either
<code class="code"><span class="constructor">Some</span> <value></code> for a value or <code class="code"><span class="constructor">None</span></code> to specify the end of the
stream.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALof_list"></a>of_list : <code class="type">'a list -> 'a <a href="Stream.html#TYPEt">t</a></code></pre><div class="info">
Return the stream holding the elements of the list in the same
order.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALof_string"></a>of_string : <code class="type">string -> char <a href="Stream.html#TYPEt">t</a></code></pre><div class="info">
Return the stream of the characters of the string parameter.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALof_channel"></a>of_channel : <code class="type"><a href="Pervasives.html#TYPEin_channel">in_channel</a> -> char <a href="Stream.html#TYPEt">t</a></code></pre><div class="info">
Return the stream of the characters read from the input channel.<br>
</div>
<br>
<a name="6_Streamiterator"></a>
<h6>Stream iterator</h6><br>
<pre><span class="keyword">val</span> <a name="VALiter"></a>iter : <code class="type">('a -> unit) -> 'a <a href="Stream.html#TYPEt">t</a> -> unit</code></pre><div class="info">
<code class="code"><span class="constructor">Stream</span>.iter f s</code> scans the whole stream s, applying function <code class="code">f</code>
in turn to each stream element encountered.<br>
</div>
<br>
<a name="6_Predefinedparsers"></a>
<h6>Predefined parsers</h6><br>
<pre><span class="keyword">val</span> <a name="VALnext"></a>next : <code class="type">'a <a href="Stream.html#TYPEt">t</a> -> 'a</code></pre><div class="info">
Return the first element of the stream and remove it from the
stream. Raise Stream.Failure if the stream is empty.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALempty"></a>empty : <code class="type">'a <a href="Stream.html#TYPEt">t</a> -> unit</code></pre><div class="info">
Return <code class="code">()</code> if the stream is empty, else raise <code class="code"><span class="constructor">Stream</span>.<span class="constructor">Failure</span></code>.<br>
</div>
<br>
<a name="6_Usefulfunctions"></a>
<h6>Useful functions</h6><br>
<pre><span class="keyword">val</span> <a name="VALpeek"></a>peek : <code class="type">'a <a href="Stream.html#TYPEt">t</a> -> 'a option</code></pre><div class="info">
Return <code class="code"><span class="constructor">Some</span></code> of "the first element" of the stream, or <code class="code"><span class="constructor">None</span></code> if
the stream is empty.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALjunk"></a>junk : <code class="type">'a <a href="Stream.html#TYPEt">t</a> -> unit</code></pre><div class="info">
Remove the first element of the stream, possibly unfreezing
it before.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALcount"></a>count : <code class="type">'a <a href="Stream.html#TYPEt">t</a> -> int</code></pre><div class="info">
Return the current count of the stream elements, i.e. the number
of the stream elements discarded.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALnpeek"></a>npeek : <code class="type">int -> 'a <a href="Stream.html#TYPEt">t</a> -> 'a list</code></pre><div class="info">
<code class="code">npeek n</code> returns the list of the <code class="code">n</code> first elements of
the stream, or all its remaining elements if less than <code class="code">n</code>
elements are available.<br>
</div>
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