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<title>YBlog - Parsec Presentation</title>
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<a href="../../../../Scratch/en/blog/Parsec-Presentation/">Anglais</a>
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<div id="titre">
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<h1>Parsec Presentation</h1>
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<div id="afterheader" class="article">
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<div class="corps">
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<p><img src="http://yogsototh.github.io/parsec-presentation/parsec/img/mp/AST.png" alt="AST" /><br />
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</p>
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<div class="intro">
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<p><span class="sc"><abbr title="Trop long; pas lu">tlpl</abbr>: </span> Une introduction rapide à Parsec. Un parser en Haskell.</p>
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</div>
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<ul>
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<li>The <span class="sc"><abbr title="HyperText Markup Language">html</abbr></span> presentation is <a href="http://yogsototh.github.io/parsec-presentation/parsec.html">here</a>.</li>
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() () () () () (
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) (
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<p>) () () () () () () () () ()</p>
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</div>
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<!-- Begin slides. Just make elements with a class of slide. -->
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<section class="slide">
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<div style="text-align:center; font-size: .9em; width: 100%; line-height: 1.2em">
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<h1 style="position: relative;">
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Parsec
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</h1>
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<author><em class="base1">by</em> Yann Esposito</author>
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<div style="font-size:.5em; margin: 0 1em;">
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<p><twitter> <a href="http://twitter.com/yogsototh"><span class="citation" data-cites="yogsototh">@yogsototh</span></a>, </twitter> <googleplus> <a href="https://plus.google.com/117858550730178181663">+yogsototh</a> </googleplus></p>
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</div>
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<div style="font-size:.8em">
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<p><em class="base1">for</em> <a href="http://www.meetup.com/riviera-scala-clojure"> Riviera Scala Clojure Meetup (Haskell) </a><br /> <em class="base1">the</em> <ti style="font-size: .8em">8 Oct 2013</ti></p>
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</div>
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</div>
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</section>
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<section class="slide">
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<h2 id="parsing">
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Parsing
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</h2>
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<p>
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Latin pars (ōrātiōnis), meaning part (of speech).
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</p>
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<ul>
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<li>
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<strong>analysing a string of symbols</strong>
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</li>
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<li>
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<strong>formal grammar</strong>.
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</li>
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</ul>
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</section>
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<section class="slide">
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<h2 id="parsing-in-programming-languages">
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Parsing in Programming Languages
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</h2>
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<p>
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Complexity:
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</p>
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<table>
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<thead>
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<tr class="header">
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<th align="left">
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Method
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</th>
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<th align="left">
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Typical Example
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</th>
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<th align="left">
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Output Data Structure
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</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td align="left">
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Splitting
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</td>
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<td align="left">
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CSV
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</td>
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<td align="left">
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Array, Map
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</td>
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</tr>
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<tr class="even">
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<td align="left">
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Regexp
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</td>
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<td align="left">
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email
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</td>
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<td align="left">
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<ul>
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<li>Fixed Layout Tree
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</td>
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</tr>
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<tr class="odd">
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<td align="left">
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Parser
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</td>
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<td align="left">
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Programming language
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</td>
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<td align="left">
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<ul>
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<li>Most Data Structure
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</td>
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</tr>
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</tbody>
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</table>
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</section>
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<section class="slide">
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<h2 id="parser-culture">
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Parser <span class="and">&</span> culture
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</h2>
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<p>
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In Haskell Parser are really easy to use.
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</p>
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<p>
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Generally:
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</p>
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<ul>
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<li>
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In most languages: <strong>split</strong> then <strong>regexp</strong> then <strong>parse</strong>
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</li>
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<li>
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In Haskell: <strong>split</strong> then <strong>parse</strong>
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</li>
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</ul>
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</section>
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<section class="slide">
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<h2 id="parsing-example">
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Parsing Example
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</h2>
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<p>
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From String:
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</p>
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<pre class="sourceCode haskell"><code class="sourceCode haskell">(<span class="dv">1</span><span class="fu">+</span><span class="dv">3</span>)<span class="fu">*</span>(<span class="dv">1</span><span class="fu">+</span><span class="dv">5</span><span class="fu">+</span><span class="dv">9</span>)</code></pre>
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<p>
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To data structure:
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</p>
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<p>
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<img src="http://yogsototh.github.io/parsec-presentation/parsec/img/mp/AST.png" alt="AST" /><br />
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</p>
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</section>
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<section class="slide">
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<h2 id="parsec">
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Parsec
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</h2>
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<blockquote>
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<p>
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Parsec lets you construct parsers by combining high-order Combinators to create larger expressions.
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</p>
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<p>
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Combinator parsers are written and used within the same programming language as the rest of the program.
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</p>
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<p>
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The parsers are first-class citizens of the languages […]"
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</p>
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<p>
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<em><a href="http://www.haskell.org/haskellwiki/Parsec">Haskell Wiki</a></em>
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</p>
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</blockquote>
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</section>
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<section class="slide">
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<h2 id="parser-libraries">
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Parser Libraries
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</h2>
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<p>
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In reality there are many choices:
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</p>
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<table>
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<tbody>
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<tr class="odd">
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<td align="left">
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attoparsec
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</td>
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<td align="left">
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fast
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</td>
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</tr>
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<tr class="even">
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<td align="left">
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Bytestring-lexing
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</td>
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<td align="left">
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fast
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</td>
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</tr>
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<tr class="odd">
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<td align="left">
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Parsec 3
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</td>
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<td align="left">
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powerful, nice error reporting
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</td>
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</tr>
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</tbody>
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</table>
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</section>
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<section class="slide">
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<h2 id="haskell-remarks-1">
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Haskell Remarks (1)
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</h2>
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<p>
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spaces are meaningful
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</p>
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<pre class="sourceCode haskell"><code class="sourceCode haskell">f x <span class="co">-- ⇔ f(x) in C-like languages</span>
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f x y <span class="co">-- ⇔ f(x,y)</span></code></pre>
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</section>
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<section class="slide">
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<h2 id="haskell-remarks-2">
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Haskell Remarks (2)
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</h2>
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<p>
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Don’t mind strange operators (<code><*></code>, <code><$></code>).<br />Consider them like separators, typically commas.<br />They are just here to deal with types.
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</p>
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<p>
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Informally:
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</p>
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<pre class="sourceCode haskell"><code class="sourceCode haskell">toto <span class="fu"><$></span> x <span class="fu"><*></span> y <span class="fu"><*></span> z
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<span class="co">-- ⇔ toto x y z</span>
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<span class="co">-- ⇔ toto(x,y,z) in C-like languages</span></code></pre>
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</section>
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<section class="slide">
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<h2 id="minimal-parsec-examples">
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Minimal Parsec Examples
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</h2>
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<pre class="sourceCode haskell"><code class="sourceCode haskell">whitespaces <span class="fu">=</span> many (oneOf <span class="st">"\t "</span>)
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number <span class="fu">=</span> many1 digit
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symbol <span class="fu">=</span> oneOf <span class="st">"!#$%<span class="and">&</span>|*+-/:<=>?@^_~"</span></code></pre>
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<pre class="sourceCode haskell">
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<code class="sourceCode haskell"><span class="st">" \t "</span> <span class="co">– whitespaces on " \t "</span> <span class="st">""</span> <span class="co">– whitespaces on “32”</span> <span class="st">“32”</span> <span class="co">– number on “32”</span></li>
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</ul></li>
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</ul>
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<span class="co">– number on "
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</div>
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<div id="totop"><a href="#header">↑ Top ↑</a></div>
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<div>
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Published on 2013-10-09
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<a href="https://twitter.com/yogsototh">Follow @yogsototh</a>
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<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US">Yann Esposito©</a>
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Done with
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