<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ -->
<title>Text/Regex/PCRE/ByteString.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-orphans #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-|
<a name="line-3"></a>This exports instances of the high level API and the medium level
<a name="line-4"></a>API of 'compile','execute', and 'regexec'.
<a name="line-5"></a>-}</span>
<a name="line-6"></a><span class='hs-comment'>{- Copyright : (c) Chris Kuklewicz 2007 -}</span>
<a name="line-7"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>PCRE</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>(</span>
<a name="line-8"></a> <span class='hs-comment'>-- ** Types</span>
<a name="line-9"></a> <span class='hs-conid'>Regex</span><span class='hs-layout'>,</span>
<a name="line-10"></a> <span class='hs-conid'>MatchOffset</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-conid'>MatchLength</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-conid'>CompOption</span><span class='hs-layout'>(</span><span class='hs-conid'>CompOption</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-conid'>ExecOption</span><span class='hs-layout'>(</span><span class='hs-conid'>ExecOption</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-14"></a> <span class='hs-conid'>ReturnCode</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-conid'>WrapError</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-comment'>-- ** Miscellaneous</span>
<a name="line-17"></a> <span class='hs-varid'>unusedOffset</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-varid'>getVersion</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-comment'>-- ** Medium level API functions</span>
<a name="line-20"></a> <span class='hs-varid'>compile</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>execute</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>regexec</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-comment'>-- ** CompOption flags</span>
<a name="line-24"></a> <span class='hs-varid'>compBlank</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-varid'>compAnchored</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>compAutoCallout</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>compCaseless</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-varid'>compDollarEndOnly</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>compDotAll</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-varid'>compExtended</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>compExtra</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>compFirstLine</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>compMultiline</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>compNoAutoCapture</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>compUngreedy</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-varid'>compUTF8</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-varid'>compNoUTF8Check</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-comment'>-- ** ExecOption flags</span>
<a name="line-39"></a> <span class='hs-varid'>execBlank</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>execAnchored</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-varid'>execNotBOL</span><span class='hs-layout'>,</span>
<a name="line-42"></a> <span class='hs-varid'>execNotEOL</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-varid'>execNotEmpty</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-varid'>execNoUTF8Check</span><span class='hs-layout'>,</span>
<a name="line-45"></a> <span class='hs-varid'>execPartial</span>
<a name="line-46"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-47"></a>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>PCRE</span><span class='hs-varop'>.</span><span class='hs-conid'>Wrap</span> <span class='hs-comment'>-- all</span>
<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span><span class='hs-layout'>(</span><span class='hs-conid'>Array</span><span class='hs-layout'>,</span><span class='hs-varid'>listArray</span><span class='hs-layout'>)</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-51"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span><span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span><span class='hs-varid'>useAsCString</span><span class='hs-layout'>,</span><span class='hs-varid'>last</span><span class='hs-layout'>,</span><span class='hs-varid'>take</span><span class='hs-layout'>,</span><span class='hs-varid'>drop</span><span class='hs-layout'>,</span><span class='hs-varid'>null</span><span class='hs-layout'>,</span><span class='hs-varid'>pack</span><span class='hs-layout'>)</span>
<a name="line-52"></a><span class='hs-cpp'>#ifdef SPLIT_BASE</span>
<a name="line-53"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span><span class='hs-layout'>(</span><span class='hs-varid'>unsafeUseAsCString</span><span class='hs-layout'>,</span><span class='hs-varid'>unsafeUseAsCStringLen</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-cpp'>#else</span>
<a name="line-55"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span><span class='hs-layout'>(</span><span class='hs-varid'>unsafeUseAsCString</span><span class='hs-layout'>,</span><span class='hs-varid'>unsafeUseAsCStringLen</span><span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-cpp'>#endif</span>
<a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-layout'>(</span><span class='hs-varid'>unsafePerformIO</span><span class='hs-layout'>)</span>
<a name="line-58"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span><span class='hs-varop'>.</span><span class='hs-conid'>RegexLike</span><span class='hs-layout'>(</span><span class='hs-conid'>RegexContext</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>RegexMaker</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>RegexLike</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>MatchOffset</span><span class='hs-layout'>,</span><span class='hs-conid'>MatchLength</span><span class='hs-layout'>)</span>
<a name="line-59"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span><span class='hs-varop'>.</span><span class='hs-conid'>Impl</span><span class='hs-layout'>(</span><span class='hs-varid'>polymatch</span><span class='hs-layout'>,</span><span class='hs-varid'>polymatchM</span><span class='hs-layout'>)</span>
<a name="line-60"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span><span class='hs-layout'>(</span><span class='hs-conid'>CStringLen</span><span class='hs-layout'>)</span>
<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-layout'>(</span><span class='hs-varid'>nullPtr</span><span class='hs-layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RegexContext</span> <span class='hs-conid'>Regex</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyword'>where</span>
<a name="line-64"></a> <span class='hs-varid'>match</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>polymatch</span>
<a name="line-65"></a> <span class='hs-varid'>matchM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>polymatchM</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="unwrap"></a><span class='hs-definition'>unwrap</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Either</span> <span class='hs-varid'>e</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>v</span>
<a name="line-68"></a><span class='hs-definition'>unwrap</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Text.Regex.PCRE.ByteString died: "</span><span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>v</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="asCStringLen"></a><span class='hs-comment'>{-# INLINE asCStringLen #-}</span>
<a name="line-72"></a><span class='hs-definition'>asCStringLen</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>CStringLen</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-73"></a><span class='hs-definition'>asCStringLen</span> <span class='hs-varid'>s</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeUseAsCStringLen</span> <span class='hs-varid'>s</span> <span class='hs-varid'>checked</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>checked</span> <span class='hs-varid'>cs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>ptr</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ptr</span> <span class='hs-varop'>==</span> <span class='hs-varid'>nullPtr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeUseAsCStringLen</span> <span class='hs-varid'>myEmpty</span> <span class='hs-layout'>(</span><span class='hs-varid'>op</span> <span class='hs-varop'>.</span> <span class='hs-varid'>trim</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>op</span> <span class='hs-varid'>cs</span>
<a name="line-76"></a> <span class='hs-varid'>myEmpty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a> <span class='hs-varid'>trim</span> <span class='hs-layout'>(</span><span class='hs-varid'>ptr</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>ptr</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RegexMaker</span> <span class='hs-conid'>Regex</span> <span class='hs-conid'>CompOption</span> <span class='hs-conid'>ExecOption</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyword'>where</span>
<a name="line-80"></a> <span class='hs-varid'>makeRegexOpts</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span> <span class='hs-varid'>pattern</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-81"></a> <span class='hs-varid'>compile</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span> <span class='hs-varid'>pattern</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>unwrap</span>
<a name="line-82"></a> <span class='hs-varid'>makeRegexOptsM</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span> <span class='hs-varid'>pattern</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>either</span> <span class='hs-layout'>(</span><span class='hs-varid'>fail</span><span class='hs-varop'>.</span><span class='hs-varid'>show</span><span class='hs-layout'>)</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-83"></a> <span class='hs-varid'>compile</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span> <span class='hs-varid'>pattern</span>
<a name="line-84"></a>
<a name="line-85"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>RegexLike</span> <span class='hs-conid'>Regex</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyword'>where</span>
<a name="line-86"></a> <span class='hs-varid'>matchTest</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-87"></a> <span class='hs-varid'>asCStringLen</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapTest</span> <span class='hs-num'>0</span> <span class='hs-varid'>regex</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>unwrap</span>
<a name="line-88"></a> <span class='hs-varid'>matchOnce</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-89"></a> <span class='hs-varid'>execute</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>unwrap</span>
<a name="line-90"></a> <span class='hs-varid'>matchAll</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-91"></a> <span class='hs-varid'>asCStringLen</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapMatchAll</span> <span class='hs-varid'>regex</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>unwrap</span>
<a name="line-92"></a> <span class='hs-varid'>matchCount</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-93"></a> <span class='hs-varid'>asCStringLen</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapCount</span> <span class='hs-varid'>regex</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>unwrap</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="compile"></a><span class='hs-comment'>-- ---------------------------------------------------------------------</span>
<a name="line-96"></a><span class='hs-comment'>-- | Compiles a regular expression</span>
<a name="line-97"></a><span class='hs-comment'>--</span>
<a name="line-98"></a><span class='hs-definition'>compile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CompOption</span> <span class='hs-comment'>-- ^ (summed together)</span>
<a name="line-99"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ExecOption</span> <span class='hs-comment'>-- ^ (summed together)</span>
<a name="line-100"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ The regular expression to compile</span>
<a name="line-101"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-layout'>(</span><span class='hs-conid'>MatchOffset</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-conid'>Regex</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Returns: the compiled regular expression</span>
<a name="line-102"></a><span class='hs-definition'>compile</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span> <span class='hs-varid'>pattern</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-103"></a> <span class='hs-comment'>-- PCRE does not allow one to specify a length for the regular expression, it must by 0 terminated</span>
<a name="line-104"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>asCString</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-varop'>==</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>last</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeUseAsCString</span> <span class='hs-varid'>bs</span>
<a name="line-106"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>useAsCString</span> <span class='hs-varid'>bs</span>
<a name="line-107"></a> <span class='hs-varid'>asCString</span> <span class='hs-varid'>pattern</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapCompile</span> <span class='hs-varid'>c</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="execute"></a><span class='hs-comment'>-- ---------------------------------------------------------------------</span>
<a name="line-110"></a><span class='hs-comment'>-- | Matches a regular expression against a buffer, returning the buffer</span>
<a name="line-111"></a><span class='hs-comment'>-- indicies of the match, and any submatches</span>
<a name="line-112"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><span class='hs-comment'>-- | Matches a regular expression against a string</span>
<a name="line-114"></a><span class='hs-definition'>execute</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Regex</span> <span class='hs-comment'>-- ^ Compiled regular expression</span>
<a name="line-115"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ String to match against</span>
<a name="line-116"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>WrapError</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Array</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>MatchOffset</span><span class='hs-layout'>,</span><span class='hs-conid'>MatchLength</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-117"></a> <span class='hs-comment'>-- ^ Returns: 'Nothing' if the regex did not match the</span>
<a name="line-118"></a> <span class='hs-comment'>-- string, or:</span>
<a name="line-119"></a> <span class='hs-comment'>-- 'Just' an array of (offset,length) pairs where index 0 is whole match, and the rest are the captured subexpressions.</span>
<a name="line-120"></a><span class='hs-definition'>execute</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-121"></a> <span class='hs-varid'>maybeStartEnd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asCStringLen</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapMatch</span> <span class='hs-num'>0</span> <span class='hs-varid'>regex</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>maybeStartEnd</span> <span class='hs-keyword'>of</span>
<a name="line-123"></a> <span class='hs-conid'>Right</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-124"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>parts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-125"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>listArray</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-varid'>pred</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>parts</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-comment'>-</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parts</span>
<a name="line-127"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-128"></a>
<a name="line-129"></a><a name="regexec"></a><span class='hs-definition'>regexec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Regex</span> <span class='hs-comment'>-- ^ Compiled regular expression</span>
<a name="line-130"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ String to match against</span>
<a name="line-131"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>WrapError</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-132"></a><span class='hs-definition'>regexec</span> <span class='hs-varid'>regex</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-133"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>getSub</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span><span class='hs-varid'>stop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>start</span> <span class='hs-varop'>==</span> <span class='hs-varid'>unusedOffset</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-134"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>stop</span><span class='hs-comment'>-</span><span class='hs-varid'>start</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-varid'>start</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bs</span>
<a name="line-135"></a> <span class='hs-varid'>matchedParts</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span><span class='hs-varid'>bs</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- no information</span>
<a name="line-136"></a> <span class='hs-varid'>matchedParts</span> <span class='hs-layout'>(</span><span class='hs-varid'>matchedStartStop</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span><span class='hs-varid'>stop</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>subStartStop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-137"></a> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>take</span> <span class='hs-varid'>start</span> <span class='hs-varid'>bs</span>
<a name="line-138"></a> <span class='hs-layout'>,</span><span class='hs-varid'>getSub</span> <span class='hs-varid'>matchedStartStop</span>
<a name="line-139"></a> <span class='hs-layout'>,</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-varid'>stop</span> <span class='hs-varid'>bs</span>
<a name="line-140"></a> <span class='hs-layout'>,</span><span class='hs-varid'>map</span> <span class='hs-varid'>getSub</span> <span class='hs-varid'>subStartStop</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-varid'>maybeStartEnd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asCStringLen</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrapMatch</span> <span class='hs-num'>0</span> <span class='hs-varid'>regex</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>maybeStartEnd</span> <span class='hs-keyword'>of</span>
<a name="line-143"></a> <span class='hs-conid'>Right</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-144"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>parts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>matchedParts</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parts</span>
<a name="line-145"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
</pre></body>
</html>
