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<link title="Stdpp" rel="Chapter" href="Stdpp.html"><title>Plexer</title>
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<center><h1>Module <a href="type_Plexer.html">Plexer</a></h1></center>
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<pre><span class="keyword">module</span> Plexer: <code class="type">sig end</code></pre><div class="info">
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A lexical analyzer.<br>
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<pre><span class="keyword">val</span> <a name="VALgmake"></a>gmake : <code class="type">unit -> Token.t <a href="Token.html#TYPEglexer">Token.glexer</a></code></pre><div class="info">
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Some lexer provided. See the module <code class="code">Token</code>. The tokens returned
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follow the Objective Caml and the Revised syntax lexing rules.
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The meaning of the tokens are:<ul>
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<li> * <code class="code">("", s)</code> is the keyword <code class="code">s</code>.</li>
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<li> * <code class="code">("LIDENT", s)</code> is the ident <code class="code">s</code> starting with a lowercase letter.</li>
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<li> * <code class="code">("UIDENT", s)</code> is the ident <code class="code">s</code> starting with an uppercase letter.</li>
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<li> * <code class="code">("INT", s)</code> (resp. <code class="code">"INT32"</code>, <code class="code">"INT64"</code> and <code class="code">"NATIVEINT"</code>)
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is an integer constant whose string source is <code class="code">s</code>.</li>
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<li> * <code class="code">("FLOAT", s)</code> is a float constant whose string source is <code class="code">s</code>.</li>
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<li> * <code class="code">("STRING", s)</code> is the string constant <code class="code">s</code>.</li>
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<li> * <code class="code">("CHAR", s)</code> is the character constant <code class="code">s</code>.</li>
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<li> * <code class="code">("QUOTATION", "t:s")</code> is a quotation <code class="code">t</code> holding the string <code class="code">s</code>.</li>
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<li> * <code class="code">("ANTIQUOT", "t:s")</code> is an antiquotation <code class="code">t</code> holding the string <code class="code">s</code>.</li>
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<li> * <code class="code">("LOCATE", "i:s")</code> is a location directive at pos <code class="code">i</code> holding <code class="code">s</code>.</li>
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<li> * <code class="code">("EOI", "")</code> is the end of input.</li>
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The associated token patterns in the EXTEND statement hold the
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same names than the first string (constructor name) of the tokens
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Warning: the string associated with the constructor <code class="code">STRING</code> is
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the string found in the source without any interpretation. In
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particular, the backslashes are not interpreted. For example, if
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the input is <code class="code">"\n"</code> the string is *not* a string with one
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element containing the character "return", but a string of two
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elements: the backslash and the character <code class="code">"n"</code>. To interpret
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a string use the function <code class="code">Token.eval_string</code>. Same thing for
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the constructor <code class="code">CHAR</code>: to get the character, don't get the
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first character of the string, but use the function
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<code class="code">Token.eval_char</code>.
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The lexer do not use global (mutable) variables: instantiations
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of <code class="code">Plexer.gmake ()</code> do not perturb each other.<br>
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<pre><span class="keyword">val</span> <a name="VALdollar_for_antiquotation"></a>dollar_for_antiquotation : <code class="type">bool ref</code></pre><div class="info">
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When True (default), the next call to <code class="code">Plexer.make ()</code> returns a
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lexer where the dollar sign is used for antiquotations. If False,
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the dollar sign can be used as token.<br>
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<pre><span class="keyword">val</span> <a name="VALspecific_space_dot"></a>specific_space_dot : <code class="type">bool ref</code></pre><div class="info">
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When False (default), the next call to <code class="code">Plexer.make ()</code> returns a
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lexer where the dots can be preceded by spaces. If True, dots
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preceded by spaces return the keyword " ." (space dot), otherwise
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return the keyword "." (dot).<br>
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<pre><span class="keyword">val</span> <a name="VALno_quotations"></a>no_quotations : <code class="type">bool ref</code></pre><div class="info">
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When True, all lexers built by <code class="code">Plexer.make ()</code> do not lex the
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quotation syntax any more. Default is False (quotations are
b'\\ No newline at end of file'
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camlp4.html/lib/Plexer.html
