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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netulex.ULB</title>
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</div>
<h1>Module <a href="type_Netulex.ULB.html">Netulex.ULB</a></h1>
<pre><span id="MODULEULB"><span class="keyword">module</span> ULB</span>: <code class="code">sig</code> <a href="Netulex.ULB.html">..</a> <code class="code">end</code></pre><hr width="100%">
<p>This module provides the <code class="code">unicode_lexbuf</code> record with
access functions. In this record, the data is available
in two forms: As an array of Unicode code points
<code class="code">ulb_chars</code>, and as string of encoded chars <code class="code">ulb_rawbuf</code>.
Both buffers are synchronised by <code class="code">ulb_chars_pos</code>. This
array stores where every character of <code class="code">ulb_chars</code> can be
found in <code class="code">ulb_rawbuf</code>.</p>
<pre><code><span id="TYPEunicode_lexbuf"><span class="keyword">type</span> <code class="type"></code>unicode_lexbuf</span> = private {</code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_encoding">ulb_encoding</span> : <code class="type"><a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a></code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The character encoding of <code class="code">ulb_rawbuf</code></p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_encoding_start">ulb_encoding_start</span> : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The first character position to which <code class="code">ulb_encoding</code>
applies (the encoding of earlier positions is
lost)</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_rawbuf">ulb_rawbuf</span> : <code class="type">Stdlib.Bytes.t</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The encoded string to analyse</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_rawbuf_len">ulb_rawbuf_len</span> : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The filled part of <code class="code">ulb_rawbuf</code></p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_rawbuf_end">ulb_rawbuf_end</span> : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The analysed part of <code class="code">ulb_rawbuf</code>. We have always
<code class="code">ulb_rawbuf_end <= ulb_rawbuf_len</code>. The analysed part
may be shorter than the filled part because there is
not enough space in <code class="code">ulb_chars</code>, or because the filled
part ends with an incomplete multi-byte character</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_rawbuf_const">ulb_rawbuf_const</span> : <code class="type">bool</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>Whether <code class="code">ulb_rawbuf</code> is considered as a constant. If
<code class="code">true</code>, it is never blitted.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_chars">ulb_chars</span> : <code class="type">int array</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The analysed part of <code class="code">ulb_rawbuf</code> as array of Unicode
code points. Only the positions 0 to <code class="code">ulb_chars_len-1</code>
of the array are filled.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_chars_pos">ulb_chars_pos</span> : <code class="type">int array</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>For every analysed character this array stores the
byte position where the character begins in <code class="code">ulb_rawbuf</code>.
In addition, the array contains at <code class="code">ulb_chars_len</code> the
value of <code class="code">ulb_rawbuf_end</code>.</p>
<p>This array is one element longer than <code class="code">ulb_chars</code>.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_chars_len">ulb_chars_len</span> : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The filled part of <code class="code">ulb_chars</code></p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_eof">ulb_eof</span> : <code class="type">bool</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>Whether EOF has been seen</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_refill">ulb_refill</span> : <code class="type">Stdlib.Bytes.t -> int -> int -> int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The refill function</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_enc_change_hook">ulb_enc_change_hook</span> : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>This function is called when the encoding changes</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span><span id="TYPEELTunicode_lexbuf.ulb_cursor">ulb_cursor</span> : <code class="type">Stdlib.Bytes.t <a href="Netconversion.html#TYPEpoly_cursor">Netconversion.poly_cursor</a></code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>Internally used by the implementation</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>
}
<pre><span id="VALfrom_function"><span class="keyword">val</span> from_function</span> : <code class="type">?raw_size:int -><br> ?char_size:int -><br> ?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> refill:(Stdlib.Bytes.t -> int -> int -> int) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a <code class="code">unicode_lexbuf</code> to analyse strings of the
passed <code class="code">encoding</code> coming from the <code class="code">refill</code> function.</p>
</div>
</div>
<div class="param_info"><code class="code">raw_size</code> : The initial size for <code class="code">ulb_rawbuf</code>. Defaults to 512</div>
<div class="param_info"><code class="code">char_size</code> : The initial size for <code class="code">ulb_chars</code>. Defaults to 256</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code>.</div>
<div class="param_info"><code class="code">refill</code> : This function is called with arguments <code class="code">ulb_rawbuf</code>,
<code class="code">ulb_rawbuf_len</code>, and <code class="code">l</code>, where
<code class="code">l = String.length ulb_rawbuf - ulb_rawbuf_len</code> is the free
space in the buffer. The function should fill new bytes into
this substring, and return the number of added bytes. The
return value 0 signals EOF.</div>
<pre><span id="VALfrom_in_obj_channel"><span class="keyword">val</span> from_in_obj_channel</span> : <code class="type">?raw_size:int -><br> ?char_size:int -><br> ?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -><br> <a href="Netchannels.in_obj_channel-c.html">Netchannels.in_obj_channel</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a <code class="code">unicode_lexbuf</code> to analyse strings of the
passed <code class="code">encoding</code> coming from the object channel.</p>
</div>
</div>
<div class="param_info"><code class="code">raw_size</code> : The initial size for <code class="code">ulb_rawbuf</code>. Defaults to 512</div>
<div class="param_info"><code class="code">char_size</code> : The initial size for <code class="code">ulb_chars</code>. Defaults to 256</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code>.</div>
<pre><span id="VALfrom_string"><span class="keyword">val</span> from_string</span> : <code class="type">?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> string -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a <code class="code">unicode_lexbuf</code> analysing the passed string encoded in
the passed encoding. This function copies the input string.</p>
</div>
</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code></div>
<pre><span id="VALfrom_bytes"><span class="keyword">val</span> from_bytes</span> : <code class="type">?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> Stdlib.Bytes.t -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<pre><span id="VALfrom_bytes_inplace"><span class="keyword">val</span> from_bytes_inplace</span> : <code class="type">?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> Stdlib.Bytes.t -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a <code class="code">unicode_lexbuf</code> analysing the passed string encoded in
the passed encoding. This function does not copy the input string,
but uses it directly as <code class="code">ulb_rawbuf</code>. The string is not modified by <code class="code">ULB</code>,
but the caller must ensure that other program parts do not
modify it either.</p>
</div>
</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code></div>
<p>Regarding <code class="code">from_string_inplace</code>, this function has been removed
as strings are now considered immutable.</p>
<pre><span id="VALdelete"><span class="keyword">val</span> delete</span> : <code class="type">int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Deletes the number of characters from <code class="code">unicode_lexbuf</code>.
These characters
are removed from the beginning of the buffer, i.e.
<code class="code">ulb_chars.(n)</code> becomes the new first character of the
buffer. All three buffers <code class="code">ulb_rawbuf</code>, <code class="code">ulb_chars</code>, and
<code class="code">ulb_chars_pos</code> are blitted as necessary.</p>
<p>When the buffer is already at EOF, the function fails.</p>
<p>For efficiency, it should be tried to call <code class="code">delete</code> as seldom as
possible. Its speed is linear to the number of characters to move.</p>
</div>
</div>
<pre><span id="VALrefill"><span class="keyword">val</span> refill</span> : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Tries to add characters to the <code class="code">unicode_lexbuf</code> by calling the
<code class="code">ulb_refill</code> function. When the buffer is already at EOF, the
exception <code class="code">End_of_file</code> is raised, and the buffer is not modified.
Otherwise, the <code class="code">ulb_refill</code> function is called to
add new characters. If necessary, <code class="code">ulb_rawbuf</code>, <code class="code">ulb_chars</code>, and
<code class="code">ulb_chars_pos</code> are enlarged such that it is ensured that either
at least one new character is added, or that EOF is found for
the first time
In the latter case, <code class="code">ulb_eof</code> is set to <code class="code">true</code> (and the next call
of <code class="code">refill_unicode_lexbuf</code> will raise <code class="code">End_of_file</code>).</p>
</div>
</div>
<pre><span id="VALset_encoding"><span class="keyword">val</span> set_encoding</span> : <code class="type"><a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets the <code class="code">encoding</code> to the passed value. This only affects future
<code class="code">refill</code> calls. The hook <code class="code">enc_change_hook</code> is invoked when defined.</p>
</div>
</div>
<pre><span id="VALclose"><span class="keyword">val</span> close</span> : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets <code class="code">ulb_eof</code> of the <code class="code">unicode_lexbuf</code>. The rest of the buffer
is not modified</p>
</div>
</div>
<pre><span id="VALutf8_sub_string"><span class="keyword">val</span> utf8_sub_string</span> : <code class="type">int -> int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>The two <code class="code">int</code> arguments are the position and length of a sub
string of the lexbuf that is returned as UTF8 string. Position
and length are given as character multiples, not byte multiples.</p>
</div>
</div>
<pre><span id="VALutf8_sub_string_length"><span class="keyword">val</span> utf8_sub_string_length</span> : <code class="type">int -> int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Returns <code class="code">String.length(utf8_sub_string args)</code>. Tries not to
allocate the UTF-8 string.</p>
</div>
</div>
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