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MLLex
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MLLex is a lexical analyzer generator for <a href="StandardML">Standard ML</a> modeled after the Lex lexical analyzer generator. <p>
A version of MLLex, ported from the <a href="SMLNJ">SML/NJ</a> sources, is distributed with MLton.
</p>
<h2 id="head-55f8ebc805e65b5b71ddafdae390e3be2bcd69af">Description</h2>
<p>
MLLex takes as input the lex language as defined in the ML-Lex manual, and outputs a lexical analyzer in SML.
</p>
<h2 id="head-8781d615fd77be9578225c40ac67b9471394cced">Implementation</h2>
<a href = "http://mlton.org/cgi-bin/viewsvn.cgi/mlton/tags/on-MLTONWIKIVERSION-release/mllex/lexgen.sml?view=markup"><img src="moin-www.png" alt="[WWW]" height="11" width="11">lexgen.sml</a><br>
<a href = "http://mlton.org/cgi-bin/viewsvn.cgi/mlton/tags/on-MLTONWIKIVERSION-release/mllex/main.sml?view=markup"><img src="moin-www.png" alt="[WWW]" height="11" width="11">main.sml</a><br>
<a href = "http://mlton.org/cgi-bin/viewsvn.cgi/mlton/tags/on-MLTONWIKIVERSION-release/mllex/call-main.sml?view=markup"><img src="moin-www.png" alt="[WWW]" height="11" width="11">call-main.sml</a> <h2 id="head-35ec00231a68203708e39f0e2cc10b50c6bf62de">Details and Notes</h2>
<p>
There are 3 main passes in the MLLex tool:
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<li>
<p>
Source parsing. In this pass, lex source program are parsed into internal representations. The core part of this pass is a hand-written lexer and an LL(1) parser. The output of this pass is a record of user code, rules (along with start states) and actions. (MLlex definitions are wiped off.)
</p>
</li>
<li>
<p>
DFA construction. In this pass, a DFA is constructed by the algorithm of H. Yamada et. al.
</p>
</li>
<li>
<p>
Output. In this pass, the generated DFA is written out as a transition table, along with a table-driven algorithm, to an SML file.
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</li>
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<h2 id="head-a4bc8bf5caf54b18cea9f58e83dd4acb488deb17">Also see</h2>
<ul>
<li>
<p>
<a href="MLYacc">MLYacc</a>
</p>
</li>
<li>
<p>
<a href = "References#AppelEtAl94">AppelEtAl94</a>
</p>
</li>
<li>
<p>
<a href = "References#Price09">Price09</a>
</p>
</li>
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Last edited on 2010-05-13 19:35:18 by <span title="fenrir.cs.rit.edu"><a href="MatthewFluet">MatthewFluet</a></span>.
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