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<title>Buffer</title>
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<h1>Module <a href="type_Buffer.html">Buffer</a></h1>
<pre><span id="MODULEBuffer"><span class="keyword">module</span> Buffer</span>: <code class="code"><span class="keyword">sig</span></code> <a href="Buffer.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info module top">
<div class="info-desc">
<p>Extensible buffers.</p>
<p>This module implements buffers that automatically expand
as necessary. It provides accumulative concatenation of strings
in quasi-linear time (instead of quadratic time when strings are
concatenated pairwise).</p>
</div>
</div>
<hr width="100%">
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The abstract type of buffers.</p>
</div>
</div>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -> <a href="Buffer.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">create n</code> returns a fresh buffer, initially empty.
The <code class="code">n</code> parameter is the initial size of the internal byte sequence
that holds the buffer contents. That byte sequence is automatically
reallocated when more than <code class="code">n</code> characters are stored in the buffer,
but shrinks back to <code class="code">n</code> characters when <code class="code">reset</code> is called.
For best performance, <code class="code">n</code> should be of the same order of magnitude
as the number of characters that are expected to be stored in
the buffer (for instance, 80 for a buffer that holds one output
line). Nothing bad will happen if the buffer grows beyond that
limit, however. In doubt, take <code class="code">n = 16</code> for instance.
If <code class="code">n</code> is not between 1 and <a href="Sys.html#VALmax_string_length"><code class="code"><span class="constructor">Sys</span>.max_string_length</code></a>, it will
be clipped to that interval.</p>
</div>
</div>
<pre><span id="VALcontents"><span class="keyword">val</span> contents</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Return a copy of the current contents of the buffer.
The buffer itself is unchanged.</p>
</div>
</div>
<pre><span id="VALto_bytes"><span class="keyword">val</span> to_bytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes</code></pre><div class="info ">
<div class="info-desc">
<p>Return a copy of the current contents of the buffer.
The buffer itself is unchanged.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>
<pre><span id="VALsub"><span class="keyword">val</span> sub</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> int -> string</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Buffer</span>.sub b off len</code> returns a copy of <code class="code">len</code> bytes from the
current contents of the buffer <code class="code">b</code>, starting at offset <code class="code">off</code>.</p>
<p>Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">srcoff</code> and <code class="code">len</code> do not designate a valid
range of <code class="code">b</code>.</p>
</div>
</div>
<pre><span id="VALblit"><span class="keyword">val</span> blit</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> bytes -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Buffer</span>.blit src srcoff dst dstoff len</code> copies <code class="code">len</code> characters from
the current contents of the buffer <code class="code">src</code>, starting at offset <code class="code">srcoff</code>
to <code class="code">dst</code>, starting at character <code class="code">dstoff</code>.</p>
<p>Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">srcoff</code> and <code class="code">len</code> do not designate a valid
range of <code class="code">src</code>, or if <code class="code">dstoff</code> and <code class="code">len</code> do not designate a valid
range of <code class="code">dst</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 3.11.2</li>
</ul>
</div>
<pre><span id="VALnth"><span class="keyword">val</span> nth</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> char</code></pre><div class="info ">
<div class="info-desc">
<p>Get the n-th character of the buffer. Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if
index out of bounds</p>
</div>
</div>
<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Return the number of characters currently contained in the buffer.</p>
</div>
</div>
<pre><span id="VALclear"><span class="keyword">val</span> clear</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the buffer.</p>
</div>
</div>
<pre><span id="VALreset"><span class="keyword">val</span> reset</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the buffer and deallocate the internal byte sequence holding the
buffer contents, replacing it with the initial internal byte sequence
of length <code class="code">n</code> that was allocated by <a href="Buffer.html#VALcreate"><code class="code"><span class="constructor">Buffer</span>.create</code></a> <code class="code">n</code>.
For long-lived buffers that may have grown a lot, <code class="code">reset</code> allows
faster reclamation of the space used by the buffer.</p>
</div>
</div>
<pre><span id="VALadd_char"><span class="keyword">val</span> add_char</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_char b c</code> appends the character <code class="code">c</code> at the end of buffer <code class="code">b</code>.</p>
</div>
</div>
<pre><span id="VALadd_utf_8_uchar"><span class="keyword">val</span> add_utf_8_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_8_uchar b u</code> appends the <a href="https://tools.ietf.org/html/rfc3629">
UTF-8</a> encoding of <code class="code">u</code> at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>
<pre><span id="VALadd_utf_16le_uchar"><span class="keyword">val</span> add_utf_16le_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_16le_uchar b u</code> appends the
<a href="https://tools.ietf.org/html/rfc2781">UTF-16LE</a> encoding of <code class="code">u</code>
at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>
<pre><span id="VALadd_utf_16be_uchar"><span class="keyword">val</span> add_utf_16be_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_16be_uchar b u</code> appends the
<a href="https://tools.ietf.org/html/rfc2781">UTF-16BE</a> encoding of <code class="code">u</code>
at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>
<pre><span id="VALadd_string"><span class="keyword">val</span> add_string</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_string b s</code> appends the string <code class="code">s</code> at the end of buffer <code class="code">b</code>.</p>
</div>
</div>
<pre><span id="VALadd_bytes"><span class="keyword">val</span> add_bytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_bytes b s</code> appends the byte sequence <code class="code">s</code> at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>
<pre><span id="VALadd_substring"><span class="keyword">val</span> add_substring</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substring b s ofs len</code> takes <code class="code">len</code> characters from offset
<code class="code">ofs</code> in string <code class="code">s</code> and appends them at the end of buffer <code class="code">b</code>.</p>
</div>
</div>
<pre><span id="VALadd_subbytes"><span class="keyword">val</span> add_subbytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_subbytes b s ofs len</code> takes <code class="code">len</code> characters from offset
<code class="code">ofs</code> in byte sequence <code class="code">s</code> and appends them at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>
<pre><span id="VALadd_substitute"><span class="keyword">val</span> add_substitute</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> (string -> string) -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substitute b f s</code> appends the string pattern <code class="code">s</code> at the end
of buffer <code class="code">b</code> with substitution.
The substitution process looks for variables into
the pattern and substitutes each variable name by its value, as
obtained by applying the mapping <code class="code">f</code> to the variable name. Inside the
string pattern, a variable name immediately follows a non-escaped
<code class="code">$</code> character and is one of the following:</p>
<ul>
<li>a non empty sequence of alphanumeric or <code class="code">_</code> characters,</li>
<li>an arbitrary sequence of characters enclosed by a pair of
matching parentheses or curly brackets.
An escaped <code class="code">$</code> character is a <code class="code">$</code> that immediately follows a backslash
character; it then stands for a plain <code class="code">$</code>.
Raise <code class="code"><span class="constructor">Not_found</span></code> if the closing character of a parenthesized variable
cannot be found.</li>
</ul>
</div>
</div>
<pre><span id="VALadd_buffer"><span class="keyword">val</span> add_buffer</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_buffer b1 b2</code> appends the current contents of buffer <code class="code">b2</code>
at the end of buffer <code class="code">b1</code>. <code class="code">b2</code> is not modified.</p>
</div>
</div>
<pre><span id="VALadd_channel"><span class="keyword">val</span> add_channel</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Pervasives.html#TYPEin_channel">in_channel</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_channel b ic n</code> reads at most <code class="code">n</code> characters from the
input channel <code class="code">ic</code> and stores them at the end of buffer <code class="code">b</code>.
Raise <code class="code"><span class="constructor">End_of_file</span></code> if the channel contains fewer than <code class="code">n</code>
characters. In this case, the characters are still added to
the buffer, so as to avoid loss of data.</p>
</div>
</div>
<pre><span id="VALoutput_buffer"><span class="keyword">val</span> output_buffer</span> : <code class="type"><a href="Pervasives.html#TYPEout_channel">out_channel</a> -> <a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">output_buffer oc b</code> writes the current contents of buffer <code class="code">b</code>
on the output channel <code class="code">oc</code>.</p>
</div>
</div>
<pre><span id="VALtruncate"><span class="keyword">val</span> truncate</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">truncate b len</code> truncates the length of <code class="code">b</code> to <code class="code">len</code>
Note: the internal byte sequence is not shortened.
Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">len < 0</code> or <code class="code">len > length b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.05.0</li>
</ul>
</div>
<h7 id="6_Iterators">Iterators</h7>
<pre><span id="VALto_seq"><span class="keyword">val</span> to_seq</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char <a href="Seq.html#TYPEt">Seq.t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Iterate on the buffer, in increasing order.
Modification of the buffer during iteration is undefined behavior.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>
<pre><span id="VALto_seqi"><span class="keyword">val</span> to_seqi</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> (int * char) <a href="Seq.html#TYPEt">Seq.t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Iterate on the buffer, in increasing order, yielding indices along chars.
Modification of the buffer during iteration is undefined behavior.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>
<pre><span id="VALadd_seq"><span class="keyword">val</span> add_seq</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char <a href="Seq.html#TYPEt">Seq.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Add chars to the buffer</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>
<pre><span id="VALof_seq"><span class="keyword">val</span> of_seq</span> : <code class="type">char <a href="Seq.html#TYPEt">Seq.t</a> -> <a href="Buffer.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Create a buffer from the generator</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>
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