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<link title="Weak" rel="Chapter" href="Weak.html"><title>Stdlib.Parsing</title>
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<h1>Module <a href="type_Stdlib.Parsing.html">Stdlib.Parsing</a></h1>
<pre><span id="MODULEParsing"><span class="keyword">module</span> Parsing</span>: <code class="type"><a href="Parsing.html">Parsing</a></code></pre><hr width="100%">
<pre><span id="VALsymbol_start"><span class="keyword">val</span> symbol_start</span> : <code class="type">unit -> int</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">symbol_start</code> and <a href="Parsing.html#VALsymbol_end"><code class="code"><span class="constructor">Parsing</span>.symbol_end</code></a> are to be called in the
action part of a grammar rule only. They return the offset of the
string that matches the left-hand side of the rule: <code class="code">symbol_start()</code>
returns the offset of the first character; <code class="code">symbol_end()</code> returns the
offset after the last character. The first character in a file is at
offset 0.</p>
</div>
</div>
<pre><span id="VALsymbol_end"><span class="keyword">val</span> symbol_end</span> : <code class="type">unit -> int</code></pre><div class="info ">
<div class="info-desc">
<p>See <a href="Parsing.html#VALsymbol_start"><code class="code"><span class="constructor">Parsing</span>.symbol_start</code></a>.</p>
</div>
</div>
<pre><span id="VALrhs_start"><span class="keyword">val</span> rhs_start</span> : <code class="type">int -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Same as <a href="Parsing.html#VALsymbol_start"><code class="code"><span class="constructor">Parsing</span>.symbol_start</code></a> and <a href="Parsing.html#VALsymbol_end"><code class="code"><span class="constructor">Parsing</span>.symbol_end</code></a>, but
return the offset of the string matching the <code class="code">n</code>th item on the
right-hand side of the rule, where <code class="code">n</code> is the integer parameter
to <code class="code">rhs_start</code> and <code class="code">rhs_end</code>. <code class="code">n</code> is 1 for the leftmost item.</p>
</div>
</div>
<pre><span id="VALrhs_end"><span class="keyword">val</span> rhs_end</span> : <code class="type">int -> int</code></pre><div class="info ">
<div class="info-desc">
<p>See <a href="Parsing.html#VALrhs_start"><code class="code"><span class="constructor">Parsing</span>.rhs_start</code></a>.</p>
</div>
</div>
<pre><span id="VALsymbol_start_pos"><span class="keyword">val</span> symbol_start_pos</span> : <code class="type">unit -> <a href="Lexing.html#TYPEposition">Lexing.position</a></code></pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">symbol_start</code>, but return a <code class="code">position</code> instead of an offset.</p>
</div>
</div>
<pre><span id="VALsymbol_end_pos"><span class="keyword">val</span> symbol_end_pos</span> : <code class="type">unit -> <a href="Lexing.html#TYPEposition">Lexing.position</a></code></pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">symbol_end</code>, but return a <code class="code">position</code> instead of an offset.</p>
</div>
</div>
<pre><span id="VALrhs_start_pos"><span class="keyword">val</span> rhs_start_pos</span> : <code class="type">int -> <a href="Lexing.html#TYPEposition">Lexing.position</a></code></pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">rhs_start</code>, but return a <code class="code">position</code> instead of an offset.</p>
</div>
</div>
<pre><span id="VALrhs_end_pos"><span class="keyword">val</span> rhs_end_pos</span> : <code class="type">int -> <a href="Lexing.html#TYPEposition">Lexing.position</a></code></pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">rhs_end</code>, but return a <code class="code">position</code> instead of an offset.</p>
</div>
</div>
<pre><span id="VALclear_parser"><span class="keyword">val</span> clear_parser</span> : <code class="type">unit -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the parser stack. Call it just after a parsing function
has returned, to remove all pointers from the parser stack
to structures that were built by semantic actions during parsing.
This is optional, but lowers the memory requirements of the
programs.</p>
</div>
</div>
<pre><span id="EXCEPTIONParse_error"><span class="keyword">exception</span> Parse_error</span></pre>
<div class="info ">
<div class="info-desc">
<p>Raised when a parser encounters a syntax error.
Can also be raised from the action part of a grammar rule,
to initiate error recovery.</p>
</div>
</div>
<pre><span id="VALset_trace"><span class="keyword">val</span> set_trace</span> : <code class="type">bool -> bool</code></pre><div class="info ">
<div class="info-desc">
<p>Control debugging support for <code class="code">ocamlyacc</code>-generated parsers.
After <code class="code"><span class="constructor">Parsing</span>.set_trace <span class="keyword">true</span></code>, the pushdown automaton that
executes the parsers prints a trace of its actions (reading a token,
shifting a state, reducing by a rule) on standard output.
<code class="code"><span class="constructor">Parsing</span>.set_trace <span class="keyword">false</span></code> turns this debugging trace off.
The boolean returned is the previous state of the trace flag.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 3.11.0</li>
</ul>
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