hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-RelaxNG-Validation.html
<!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>Haskell Code by HsColour</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='comment'>{- |
<a name="line-4"></a> Module : Text.XML.HXT.RelaxNG.Validation
<a name="line-5"></a> Copyright : Copyright (C) 2008 Torben Kuseler, Uwe Schmidt
<a name="line-6"></a> License : MIT
<a name="line-7"></a>
<a name="line-8"></a> Maintainer : Uwe Schmidt (uwe@fh-wedel.de)
<a name="line-9"></a> Stability : stable
<a name="line-10"></a> Portability: portable
<a name="line-11"></a>
<a name="line-12"></a> Validation of a XML document with respect to a valid Relax NG schema in simple form.
<a name="line-13"></a> Copied and modified from \"An algorithm for RELAX NG validation\" by James Clark
<a name="line-14"></a> (<<a href="http://www.thaiopensource.com/relaxng/derivative.html">http://www.thaiopensource.com/relaxng/derivative.html</a>>).
<a name="line-15"></a>
<a name="line-16"></a>-}</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='keyword'>module</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>Validation</span>
<a name="line-21"></a> <span class='layout'>(</span> <span class='varid'>validateWithRelaxAndHandleErrors</span>
<a name="line-22"></a> <span class='layout'>,</span> <span class='varid'>validateDocWithRelax</span>
<a name="line-23"></a> <span class='layout'>,</span> <span class='varid'>validateRelax</span>
<a name="line-24"></a> <span class='layout'>,</span> <span class='varid'>validateXMLDoc</span>
<a name="line-25"></a> <span class='layout'>,</span> <span class='varid'>readForRelax</span>
<a name="line-26"></a> <span class='layout'>,</span> <span class='varid'>normalizeForRelaxValidation</span>
<a name="line-27"></a> <span class='layout'>,</span> <span class='varid'>contains</span>
<a name="line-28"></a> <span class='layout'>)</span>
<a name="line-29"></a><span class='keyword'>where</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='keyword'>import</span> <span class='conid'>Control</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>ListArrows</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DOM</span><span class='varop'>.</span><span class='conid'>Interface</span>
<a name="line-34"></a><span class='keyword'>import</span> <span class='keyword'>qualified</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DOM</span><span class='varop'>.</span><span class='conid'>XmlNode</span> <span class='keyword'>as</span> <span class='conid'>XN</span>
<a name="line-35"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DOM</span><span class='varop'>.</span><span class='conid'>Unicode</span>
<a name="line-36"></a> <span class='layout'>(</span> <span class='varid'>isXmlSpaceChar</span>
<a name="line-37"></a> <span class='layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a>
<a name="line-40"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>XmlArrow</span>
<a name="line-41"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>XmlIOStateArrow</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>Edit</span>
<a name="line-44"></a> <span class='layout'>(</span> <span class='varid'>canonicalizeAllNodes</span>
<a name="line-45"></a> <span class='layout'>,</span> <span class='varid'>collapseAllXText</span>
<a name="line-46"></a> <span class='layout'>)</span>
<a name="line-47"></a>
<a name="line-48"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>ProcessDocument</span>
<a name="line-49"></a> <span class='layout'>(</span> <span class='varid'>propagateAndValidateNamespaces</span>
<a name="line-50"></a> <span class='layout'>,</span> <span class='varid'>getDocumentContents</span>
<a name="line-51"></a> <span class='layout'>,</span> <span class='varid'>parseXmlDocument</span>
<a name="line-52"></a> <span class='layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>DataTypes</span>
<a name="line-55"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>CreatePattern</span>
<a name="line-56"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>PatternToString</span>
<a name="line-57"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>DataTypeLibraries</span>
<a name="line-58"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>RelaxNG</span><span class='varop'>.</span><span class='conid'>Utils</span>
<a name="line-59"></a> <span class='layout'>(</span> <span class='varid'>formatStringListQuot</span>
<a name="line-60"></a> <span class='layout'>,</span> <span class='varid'>compareURI</span>
<a name="line-61"></a> <span class='layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-64"></a> <span class='layout'>(</span> <span class='varid'>fromJust</span>
<a name="line-65"></a> <span class='layout'>)</span>
<a name="line-66"></a>
<a name="line-67"></a><span class='comment'>{-
<a name="line-68"></a>import qualified Debug.Trace as T
<a name="line-69"></a>-}</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="validateWithRelaxAndHandleErrors"></a><span class='definition'>validateWithRelaxAndHandleErrors</span> <span class='keyglyph'>::</span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-74"></a><span class='definition'>validateWithRelaxAndHandleErrors</span> <span class='varid'>theSchema</span>
<a name="line-75"></a> <span class='keyglyph'>=</span> <span class='varid'>validateWithRelax</span> <span class='varid'>theSchema</span>
<a name="line-76"></a> <span class='varop'>>>></span>
<a name="line-77"></a> <span class='varid'>handleErrors</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="validateWithRelax"></a><span class='definition'>validateWithRelax</span> <span class='keyglyph'>::</span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-80"></a><span class='definition'>validateWithRelax</span> <span class='varid'>theSchema</span>
<a name="line-81"></a> <span class='keyglyph'>=</span> <span class='varid'>traceMsg</span> <span class='num'>2</span> <span class='str'>"validate with Relax NG schema"</span>
<a name="line-82"></a> <span class='varop'>>>></span>
<a name="line-83"></a> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>normalizeForRelaxValidation</span> <span class='comment'>-- prepare the document for validation</span>
<a name="line-84"></a> <span class='varop'>>>></span>
<a name="line-85"></a> <span class='varid'>getChildren</span>
<a name="line-86"></a> <span class='varop'>>>></span>
<a name="line-87"></a> <span class='varid'>isElem</span> <span class='comment'>-- and select the root element</span>
<a name="line-88"></a> <span class='layout'>)</span>
<a name="line-89"></a> <span class='varop'>&&&</span>
<a name="line-90"></a> <span class='varid'>theSchema</span>
<a name="line-91"></a> <span class='layout'>)</span>
<a name="line-92"></a> <span class='varop'>>>></span>
<a name="line-93"></a> <span class='varid'>arr2A</span> <span class='varid'>validateRelax</span> <span class='comment'>-- compute vaidation errors as a document</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="handleErrors"></a><span class='definition'>handleErrors</span> <span class='keyglyph'>::</span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-96"></a><span class='definition'>handleErrors</span>
<a name="line-97"></a> <span class='keyglyph'>=</span> <span class='varid'>traceDoc</span> <span class='str'>"error found when validating with Relax NG schema"</span>
<a name="line-98"></a> <span class='varop'>>>></span>
<a name="line-99"></a> <span class='layout'>(</span> <span class='varid'>getChildren</span> <span class='comment'>-- prepare error format</span>
<a name="line-100"></a> <span class='varop'>>>></span>
<a name="line-101"></a> <span class='varid'>getText</span>
<a name="line-102"></a> <span class='varop'>>>></span>
<a name="line-103"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='str'>"Relax NG validation: "</span> <span class='varop'>++</span><span class='layout'>)</span>
<a name="line-104"></a> <span class='varop'>>>></span>
<a name="line-105"></a> <span class='varid'>mkError</span> <span class='varid'>c_err</span>
<a name="line-106"></a> <span class='layout'>)</span>
<a name="line-107"></a> <span class='varop'>>>></span>
<a name="line-108"></a> <span class='varid'>filterErrorMsg</span> <span class='comment'>-- issue errors and set system status</span>
<a name="line-109"></a>
<a name="line-110"></a>
<a name="line-111"></a><span class='comment'>{- |
<a name="line-112"></a> normalize a document for validation with Relax NG: remove all namespace declaration attributes,
<a name="line-113"></a> remove all processing instructions and merge all sequences of text nodes into a single text node
<a name="line-114"></a>-}</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="normalizeForRelaxValidation"></a><span class='definition'>normalizeForRelaxValidation</span> <span class='keyglyph'>::</span> <span class='conid'>ArrowXml</span> <span class='varid'>a</span> <span class='keyglyph'>=></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-117"></a><span class='definition'>normalizeForRelaxValidation</span>
<a name="line-118"></a> <span class='keyglyph'>=</span> <span class='varid'>processTopDownWithAttrl</span>
<a name="line-119"></a> <span class='layout'>(</span>
<a name="line-120"></a> <span class='layout'>(</span> <span class='varid'>none</span> <span class='varop'>`when`</span> <span class='comment'>-- remove all namespace attributes</span>
<a name="line-121"></a> <span class='layout'>(</span> <span class='varid'>isAttr</span>
<a name="line-122"></a> <span class='varop'>>>></span>
<a name="line-123"></a> <span class='varid'>getNamespaceUri</span>
<a name="line-124"></a> <span class='varop'>>>></span>
<a name="line-125"></a> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>compareURI</span> <span class='varid'>xmlnsNamespace</span><span class='layout'>)</span>
<a name="line-126"></a> <span class='layout'>)</span>
<a name="line-127"></a> <span class='layout'>)</span>
<a name="line-128"></a> <span class='varop'>>>></span>
<a name="line-129"></a> <span class='layout'>(</span><span class='varid'>none</span> <span class='varop'>`when`</span> <span class='varid'>isPi</span><span class='layout'>)</span> <span class='comment'>-- processing instructions</span>
<a name="line-130"></a> <span class='layout'>)</span>
<a name="line-131"></a> <span class='varop'>>>></span>
<a name="line-132"></a> <span class='varid'>collapseAllXText</span> <span class='comment'>-- all text node sequences are merged into a single text node</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-135"></a>
<a name="line-136"></a><span class='comment'>{- | Validates a xml document with respect to a Relax NG schema
<a name="line-137"></a>
<a name="line-138"></a> * 1.parameter : the arrow for computing the Relax NG schema
<a name="line-139"></a>
<a name="line-140"></a> - 2.parameter : list of options for reading and validating
<a name="line-141"></a>
<a name="line-142"></a> - 3.parameter : XML document URI
<a name="line-143"></a>
<a name="line-144"></a> - arrow-input : ignored
<a name="line-145"></a>
<a name="line-146"></a> - arrow-output : list of errors or 'none'
<a name="line-147"></a>-}</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="validateDocWithRelax"></a><span class='definition'>validateDocWithRelax</span> <span class='keyglyph'>::</span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-150"></a><span class='definition'>validateDocWithRelax</span> <span class='varid'>theSchema</span> <span class='varid'>al</span> <span class='varid'>doc</span>
<a name="line-151"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>doc</span>
<a name="line-152"></a> <span class='keyword'>then</span> <span class='varid'>root</span> <span class='conid'>[]</span> <span class='conid'>[]</span>
<a name="line-153"></a> <span class='keyword'>else</span> <span class='varid'>readForRelax</span> <span class='varid'>al</span> <span class='varid'>doc</span>
<a name="line-154"></a> <span class='layout'>)</span>
<a name="line-155"></a> <span class='varop'>>>></span>
<a name="line-156"></a> <span class='varid'>validateWithRelax</span> <span class='varid'>theSchema</span>
<a name="line-157"></a> <span class='varop'>>>></span>
<a name="line-158"></a> <span class='varid'>perform</span> <span class='varid'>handleErrors</span>
<a name="line-159"></a>
<a name="line-160"></a>
<a name="line-161"></a><span class='comment'>{- | Validates a xml document with respect to a Relax NG schema
<a name="line-162"></a>
<a name="line-163"></a> * 1.parameter : XML document
<a name="line-164"></a>
<a name="line-165"></a> - arrow-input : Relax NG schema
<a name="line-166"></a>
<a name="line-167"></a> - arrow-output : list of errors or 'none'
<a name="line-168"></a>-}</span>
<a name="line-169"></a>
<a name="line-170"></a><a name="validateRelax"></a><span class='definition'>validateRelax</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-171"></a><span class='definition'>validateRelax</span> <span class='varid'>xmlDoc</span>
<a name="line-172"></a> <span class='keyglyph'>=</span> <span class='varid'>fromLA</span>
<a name="line-173"></a> <span class='layout'>(</span> <span class='varid'>createPatternFromXmlTree</span>
<a name="line-174"></a> <span class='varop'>>>></span>
<a name="line-175"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>p</span> <span class='keyglyph'>-></span> <span class='varid'>childDeriv</span> <span class='layout'>(</span><span class='str'>""</span><span class='layout'>,</span><span class='conid'>[]</span><span class='layout'>)</span> <span class='varid'>p</span> <span class='varid'>xmlDoc</span><span class='layout'>)</span>
<a name="line-176"></a> <span class='varop'>>>></span>
<a name="line-177"></a> <span class='layout'>(</span> <span class='layout'>(</span><span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>nullable</span><span class='layout'>)</span>
<a name="line-178"></a> <span class='varop'>`guardsP`</span>
<a name="line-179"></a> <span class='varid'>root</span> <span class='conid'>[]</span> <span class='keyglyph'>[</span> <span class='layout'>(</span><span class='varid'>take</span> <span class='num'>1024</span> <span class='varop'>.</span> <span class='varid'>show</span><span class='layout'>)</span> <span class='varop'>^>></span> <span class='varid'>mkText</span> <span class='keyglyph'>]</span> <span class='comment'>-- pattern may be recursive, so the string representation</span>
<a name="line-180"></a> <span class='comment'>-- is truncated to 1024 chars to assure termination</span>
<a name="line-181"></a> <span class='layout'>)</span>
<a name="line-182"></a> <span class='layout'>)</span>
<a name="line-183"></a>
<a name="line-184"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-185"></a>
<a name="line-186"></a><a name="readForRelax"></a><span class='definition'>readForRelax</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='varid'>b</span> <span class='conid'>XmlTree</span>
<a name="line-187"></a><span class='definition'>readForRelax</span> <span class='varid'>options</span> <span class='varid'>schema</span>
<a name="line-188"></a> <span class='keyglyph'>=</span> <span class='varid'>getDocumentContents</span> <span class='varid'>options</span> <span class='varid'>schema</span>
<a name="line-189"></a> <span class='varop'>>>></span>
<a name="line-190"></a> <span class='varid'>parseXmlDocument</span> <span class='conid'>False</span>
<a name="line-191"></a> <span class='varop'>>>></span>
<a name="line-192"></a> <span class='varid'>canonicalizeAllNodes</span>
<a name="line-193"></a> <span class='varop'>>>></span>
<a name="line-194"></a> <span class='varid'>propagateAndValidateNamespaces</span>
<a name="line-195"></a>
<a name="line-196"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-197"></a>
<a name="line-198"></a><span class='comment'>{- old stuff -}</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="validateXMLDoc"></a><span class='definition'>validateXMLDoc</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>IOSArrow</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-201"></a><span class='definition'>validateXMLDoc</span> <span class='varid'>al</span> <span class='varid'>xmlDoc</span>
<a name="line-202"></a> <span class='keyglyph'>=</span> <span class='varid'>validateRelax</span>
<a name="line-203"></a> <span class='varop'>$<</span>
<a name="line-204"></a> <span class='layout'>(</span> <span class='varid'>readForRelax</span> <span class='varid'>al</span> <span class='varid'>xmlDoc</span>
<a name="line-205"></a> <span class='varop'>>>></span>
<a name="line-206"></a> <span class='varid'>normalizeForRelaxValidation</span>
<a name="line-207"></a> <span class='varop'>>>></span>
<a name="line-208"></a> <span class='varid'>getChildren</span>
<a name="line-209"></a> <span class='layout'>)</span>
<a name="line-210"></a>
<a name="line-211"></a>
<a name="line-212"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-213"></a><span class='comment'>--</span>
<a name="line-214"></a><span class='comment'>-- | tests whether a 'NameClass' contains a particular 'QName'</span>
<a name="line-215"></a>
<a name="line-216"></a><a name="contains"></a><span class='definition'>contains</span> <span class='keyglyph'>::</span> <span class='conid'>NameClass</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-217"></a><span class='definition'>contains</span> <span class='conid'>AnyName</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-218"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>AnyNameExcept</span> <span class='varid'>nc</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>not</span> <span class='layout'>(</span><span class='varid'>contains</span> <span class='varid'>nc</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-219"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>NsName</span> <span class='varid'>ns1</span><span class='layout'>)</span> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='varid'>ns1</span> <span class='varop'>==</span> <span class='varid'>namespaceUri</span> <span class='varid'>qn</span>
<a name="line-220"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>NsNameExcept</span> <span class='varid'>ns1</span> <span class='varid'>nc</span><span class='layout'>)</span> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='varid'>ns1</span> <span class='varop'>==</span> <span class='varid'>namespaceUri</span> <span class='varid'>qn</span> <span class='varop'>&&</span> <span class='varid'>not</span> <span class='layout'>(</span><span class='varid'>contains</span> <span class='varid'>nc</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-221"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>Name</span> <span class='varid'>ns1</span> <span class='varid'>ln1</span><span class='layout'>)</span> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>ns1</span> <span class='varop'>==</span> <span class='varid'>namespaceUri</span> <span class='varid'>qn</span><span class='layout'>)</span> <span class='varop'>&&</span> <span class='layout'>(</span><span class='varid'>ln1</span> <span class='varop'>==</span> <span class='varid'>localPart</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-222"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>NameClassChoice</span> <span class='varid'>nc1</span> <span class='varid'>nc2</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>contains</span> <span class='varid'>nc1</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>||</span> <span class='layout'>(</span><span class='varid'>contains</span> <span class='varid'>nc2</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-223"></a><span class='definition'>contains</span> <span class='layout'>(</span><span class='conid'>NCError</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-224"></a>
<a name="line-225"></a>
<a name="line-226"></a><a name="nullable"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-227"></a><span class='comment'>-- </span>
<a name="line-228"></a><span class='comment'>-- | tests whether a pattern matches the empty sequence</span>
<a name="line-229"></a><span class='definition'>nullable</span><span class='keyglyph'>::</span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-230"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Group</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>nullable</span> <span class='varid'>p1</span> <span class='varop'>&&</span> <span class='varid'>nullable</span> <span class='varid'>p2</span>
<a name="line-231"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Interleave</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>nullable</span> <span class='varid'>p1</span> <span class='varop'>&&</span> <span class='varid'>nullable</span> <span class='varid'>p2</span>
<a name="line-232"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>nullable</span> <span class='varid'>p1</span> <span class='varop'>||</span> <span class='varid'>nullable</span> <span class='varid'>p2</span>
<a name="line-233"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>nullable</span> <span class='varid'>p</span>
<a name="line-234"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Element</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-235"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Attribute</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-236"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>List</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-237"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Value</span> <span class='keyword'>_</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-238"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>Data</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-239"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>DataExcept</span> <span class='keyword'>_</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-240"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-241"></a><span class='definition'>nullable</span> <span class='conid'>Empty</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-242"></a><span class='definition'>nullable</span> <span class='conid'>Text</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-243"></a><span class='definition'>nullable</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-244"></a>
<a name="line-245"></a>
<a name="line-246"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-247"></a><span class='comment'>-- </span>
<a name="line-248"></a><span class='comment'>-- | computes the derivative of a pattern with respect to a XML-Child and a 'Context'</span>
<a name="line-249"></a>
<a name="line-250"></a><a name="childDeriv"></a><span class='definition'>childDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-251"></a>
<a name="line-252"></a><span class='definition'>childDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>t</span>
<a name="line-253"></a> <span class='keyglyph'>|</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isText</span> <span class='varid'>t</span> <span class='keyglyph'>=</span> <span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varop'>.</span> <span class='varid'>fromJust</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getText</span> <span class='varop'>$</span> <span class='varid'>t</span>
<a name="line-254"></a> <span class='keyglyph'>|</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isElem</span> <span class='varid'>t</span> <span class='keyglyph'>=</span> <span class='varid'>endTagDeriv</span> <span class='varid'>p4</span>
<a name="line-255"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='str'>"Call to childDeriv with wrong arguments"</span>
<a name="line-256"></a> <span class='keyword'>where</span>
<a name="line-257"></a> <span class='varid'>children</span> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getChildren</span> <span class='varop'>$</span> <span class='varid'>t</span>
<a name="line-258"></a> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='varid'>fromJust</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getElemName</span> <span class='varop'>$</span> <span class='varid'>t</span>
<a name="line-259"></a> <span class='varid'>atts</span> <span class='keyglyph'>=</span> <span class='varid'>fromJust</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getAttrl</span> <span class='varop'>$</span> <span class='varid'>t</span>
<a name="line-260"></a> <span class='varid'>cx1</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='str'>""</span><span class='layout'>,</span><span class='conid'>[]</span><span class='layout'>)</span>
<a name="line-261"></a> <span class='varid'>p1</span> <span class='keyglyph'>=</span> <span class='varid'>startTagOpenDeriv</span> <span class='varid'>p</span> <span class='varid'>qn</span>
<a name="line-262"></a> <span class='varid'>p2</span> <span class='keyglyph'>=</span> <span class='varid'>attsDeriv</span> <span class='varid'>cx1</span> <span class='varid'>p1</span> <span class='varid'>atts</span>
<a name="line-263"></a> <span class='varid'>p3</span> <span class='keyglyph'>=</span> <span class='varid'>startTagCloseDeriv</span> <span class='varid'>p2</span>
<a name="line-264"></a> <span class='varid'>p4</span> <span class='keyglyph'>=</span> <span class='varid'>childrenDeriv</span> <span class='varid'>cx1</span> <span class='varid'>p3</span> <span class='varid'>children</span>
<a name="line-265"></a>
<a name="line-266"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-267"></a><span class='comment'>-- </span>
<a name="line-268"></a><span class='comment'>-- | computes the derivative of a pattern with respect to a text node</span>
<a name="line-269"></a>
<a name="line-270"></a><a name="textDeriv"></a><span class='definition'>textDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-271"></a>
<a name="line-272"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-273"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-274"></a>
<a name="line-275"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Interleave</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-276"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span>
<a name="line-277"></a> <span class='layout'>(</span><span class='varid'>interleave</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-278"></a> <span class='layout'>(</span><span class='varid'>interleave</span> <span class='varid'>p1</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>s</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-279"></a>
<a name="line-280"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Group</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-281"></a> <span class='keyglyph'>=</span> <span class='keyword'>let</span>
<a name="line-282"></a> <span class='varid'>p</span> <span class='keyglyph'>=</span> <span class='varid'>group</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>p2</span>
<a name="line-283"></a> <span class='keyword'>in</span>
<a name="line-284"></a> <span class='keyword'>if</span> <span class='varid'>nullable</span> <span class='varid'>p1</span>
<a name="line-285"></a> <span class='keyword'>then</span> <span class='varid'>choice</span> <span class='varid'>p</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-286"></a> <span class='keyword'>else</span> <span class='varid'>p</span>
<a name="line-287"></a>
<a name="line-288"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-289"></a> <span class='keyglyph'>=</span> <span class='varid'>after</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>p2</span>
<a name="line-290"></a>
<a name="line-291"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-292"></a> <span class='keyglyph'>=</span> <span class='varid'>group</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>choice</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='conid'>Empty</span><span class='layout'>)</span>
<a name="line-293"></a>
<a name="line-294"></a><span class='definition'>textDeriv</span> <span class='keyword'>_</span> <span class='conid'>Text</span> <span class='keyword'>_</span>
<a name="line-295"></a> <span class='keyglyph'>=</span> <span class='conid'>Text</span>
<a name="line-296"></a>
<a name="line-297"></a><span class='definition'>textDeriv</span> <span class='varid'>cx1</span> <span class='layout'>(</span><span class='conid'>Value</span> <span class='layout'>(</span><span class='varid'>uri</span><span class='layout'>,</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>value</span> <span class='varid'>cx2</span><span class='layout'>)</span> <span class='varid'>s1</span>
<a name="line-298"></a> <span class='keyglyph'>=</span> <span class='keyword'>case</span> <span class='varid'>datatypeEqual</span> <span class='varid'>uri</span> <span class='varid'>s</span> <span class='varid'>value</span> <span class='varid'>cx2</span> <span class='varid'>s1</span> <span class='varid'>cx1</span>
<a name="line-299"></a> <span class='keyword'>of</span>
<a name="line-300"></a> <span class='conid'>Nothing</span> <span class='keyglyph'>-></span> <span class='conid'>Empty</span>
<a name="line-301"></a> <span class='conid'>Just</span> <span class='varid'>errStr</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed</span> <span class='varid'>errStr</span>
<a name="line-302"></a>
<a name="line-303"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Data</span> <span class='layout'>(</span><span class='varid'>uri</span><span class='layout'>,</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>params</span><span class='layout'>)</span> <span class='varid'>s1</span>
<a name="line-304"></a> <span class='keyglyph'>=</span> <span class='keyword'>case</span> <span class='varid'>datatypeAllows</span> <span class='varid'>uri</span> <span class='varid'>s</span> <span class='varid'>params</span> <span class='varid'>s1</span> <span class='varid'>cx</span>
<a name="line-305"></a> <span class='keyword'>of</span>
<a name="line-306"></a> <span class='conid'>Nothing</span> <span class='keyglyph'>-></span> <span class='conid'>Empty</span>
<a name="line-307"></a> <span class='conid'>Just</span> <span class='varid'>errStr</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed2</span> <span class='varid'>errStr</span>
<a name="line-308"></a>
<a name="line-309"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>DataExcept</span> <span class='layout'>(</span><span class='varid'>uri</span><span class='layout'>,</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varid'>params</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>s1</span>
<a name="line-310"></a> <span class='keyglyph'>=</span> <span class='keyword'>case</span> <span class='layout'>(</span><span class='varid'>datatypeAllows</span> <span class='varid'>uri</span> <span class='varid'>s</span> <span class='varid'>params</span> <span class='varid'>s1</span> <span class='varid'>cx</span><span class='layout'>)</span>
<a name="line-311"></a> <span class='keyword'>of</span>
<a name="line-312"></a> <span class='conid'>Nothing</span> <span class='keyglyph'>-></span> <span class='keyword'>if</span> <span class='varid'>not</span> <span class='varop'>$</span> <span class='varid'>nullable</span> <span class='varop'>$</span> <span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>s1</span>
<a name="line-313"></a> <span class='keyword'>then</span> <span class='conid'>Empty</span>
<a name="line-314"></a> <span class='keyword'>else</span> <span class='varid'>notAllowed</span>
<a name="line-315"></a> <span class='layout'>(</span> <span class='str'>"Any value except "</span> <span class='varop'>++</span>
<a name="line-316"></a> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>show</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>++</span>
<a name="line-317"></a> <span class='str'>" expected, but value "</span> <span class='varop'>++</span>
<a name="line-318"></a> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>show</span> <span class='varid'>s1</span><span class='layout'>)</span> <span class='varop'>++</span>
<a name="line-319"></a> <span class='str'>" found"</span>
<a name="line-320"></a> <span class='layout'>)</span>
<a name="line-321"></a> <span class='conid'>Just</span> <span class='varid'>errStr</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed</span> <span class='varid'>errStr</span>
<a name="line-322"></a>
<a name="line-323"></a><span class='definition'>textDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>List</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-324"></a> <span class='keyglyph'>=</span> <span class='keyword'>if</span> <span class='varid'>nullable</span> <span class='layout'>(</span><span class='varid'>listDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='layout'>(</span><span class='varid'>words</span> <span class='varid'>s</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-325"></a> <span class='keyword'>then</span> <span class='conid'>Empty</span>
<a name="line-326"></a> <span class='keyword'>else</span> <span class='varid'>notAllowed</span>
<a name="line-327"></a> <span class='layout'>(</span> <span class='str'>"List with value(s) "</span> <span class='varop'>++</span>
<a name="line-328"></a> <span class='varid'>show</span> <span class='varid'>p</span> <span class='varop'>++</span>
<a name="line-329"></a> <span class='str'>" expected, but value(s) "</span> <span class='varop'>++</span>
<a name="line-330"></a> <span class='varid'>formatStringListQuot</span> <span class='layout'>(</span><span class='varid'>words</span> <span class='varid'>s</span><span class='layout'>)</span> <span class='varop'>++</span>
<a name="line-331"></a> <span class='str'>" found"</span>
<a name="line-332"></a> <span class='layout'>)</span>
<a name="line-333"></a>
<a name="line-334"></a><span class='definition'>textDeriv</span> <span class='keyword'>_</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span>
<a name="line-335"></a> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-336"></a>
<a name="line-337"></a><span class='definition'>textDeriv</span> <span class='keyword'>_</span> <span class='varid'>p</span> <span class='varid'>s</span>
<a name="line-338"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span>
<a name="line-339"></a> <span class='layout'>(</span> <span class='str'>"Pattern "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>getPatternName</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>++</span>
<a name="line-340"></a> <span class='str'>" expected, but text "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>s</span> <span class='varop'>++</span> <span class='str'>" found"</span>
<a name="line-341"></a> <span class='layout'>)</span>
<a name="line-342"></a>
<a name="line-343"></a>
<a name="line-344"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-345"></a><span class='comment'>-- </span>
<a name="line-346"></a><span class='comment'>-- | To compute the derivative of a pattern with respect to a list of strings, </span>
<a name="line-347"></a><span class='comment'>-- simply compute the derivative with respect to each member of the list in turn.</span>
<a name="line-348"></a>
<a name="line-349"></a><a name="listDeriv"></a><span class='definition'>listDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>String</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-350"></a>
<a name="line-351"></a><span class='definition'>listDeriv</span> <span class='keyword'>_</span> <span class='varid'>p</span> <span class='conid'>[]</span>
<a name="line-352"></a> <span class='keyglyph'>=</span> <span class='varid'>p</span>
<a name="line-353"></a>
<a name="line-354"></a><span class='definition'>listDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='layout'>(</span><span class='varid'>x</span><span class='conop'>:</span><span class='varid'>xs</span><span class='layout'>)</span>
<a name="line-355"></a> <span class='keyglyph'>=</span> <span class='varid'>listDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>x</span><span class='layout'>)</span> <span class='varid'>xs</span>
<a name="line-356"></a>
<a name="line-357"></a>
<a name="line-358"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-359"></a><span class='comment'>-- </span>
<a name="line-360"></a><span class='comment'>-- | computes the derivative of a pattern with respect to a start tag open</span>
<a name="line-361"></a>
<a name="line-362"></a><a name="startTagOpenDeriv"></a><span class='definition'>startTagOpenDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-363"></a>
<a name="line-364"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-365"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p1</span> <span class='varid'>qn</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p2</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-366"></a>
<a name="line-367"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>Element</span> <span class='varid'>nc</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-368"></a> <span class='keyglyph'>|</span> <span class='varid'>contains</span> <span class='varid'>nc</span> <span class='varid'>qn</span>
<a name="line-369"></a> <span class='keyglyph'>=</span> <span class='varid'>after</span> <span class='varid'>p</span> <span class='conid'>Empty</span>
<a name="line-370"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-371"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='varop'>$</span>
<a name="line-372"></a> <span class='str'>"Element with name "</span> <span class='varop'>++</span> <span class='varid'>nameClassToString</span> <span class='varid'>nc</span> <span class='varop'>++</span>
<a name="line-373"></a> <span class='str'>" expected, but "</span> <span class='varop'>++</span> <span class='varid'>universalName</span> <span class='varid'>qn</span> <span class='varop'>++</span> <span class='str'>" found"</span>
<a name="line-374"></a>
<a name="line-375"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>Interleave</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-376"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span>
<a name="line-377"></a> <span class='layout'>(</span><span class='varid'>applyAfter</span> <span class='layout'>(</span><span class='varid'>flip</span> <span class='varid'>interleave</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p1</span> <span class='varid'>qn</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-378"></a> <span class='layout'>(</span><span class='varid'>applyAfter</span> <span class='layout'>(</span><span class='varid'>interleave</span> <span class='varid'>p1</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p2</span> <span class='varid'>qn</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-379"></a>
<a name="line-380"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-381"></a> <span class='keyglyph'>=</span> <span class='varid'>applyAfter</span>
<a name="line-382"></a> <span class='layout'>(</span><span class='varid'>flip</span> <span class='varid'>group</span> <span class='layout'>(</span><span class='varid'>choice</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='conid'>Empty</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-383"></a> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-384"></a>
<a name="line-385"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>Group</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-386"></a> <span class='keyglyph'>=</span> <span class='keyword'>let</span>
<a name="line-387"></a> <span class='varid'>x</span> <span class='keyglyph'>=</span> <span class='varid'>applyAfter</span> <span class='layout'>(</span><span class='varid'>flip</span> <span class='varid'>group</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p1</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-388"></a> <span class='keyword'>in</span>
<a name="line-389"></a> <span class='keyword'>if</span> <span class='varid'>nullable</span> <span class='varid'>p1</span>
<a name="line-390"></a> <span class='keyword'>then</span> <span class='varid'>choice</span> <span class='varid'>x</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p2</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-391"></a> <span class='keyword'>else</span> <span class='varid'>x</span>
<a name="line-392"></a>
<a name="line-393"></a><span class='definition'>startTagOpenDeriv</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>qn</span>
<a name="line-394"></a> <span class='keyglyph'>=</span> <span class='varid'>applyAfter</span> <span class='layout'>(</span><span class='varid'>flip</span> <span class='varid'>after</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>startTagOpenDeriv</span> <span class='varid'>p1</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-395"></a>
<a name="line-396"></a><span class='definition'>startTagOpenDeriv</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span>
<a name="line-397"></a> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-398"></a>
<a name="line-399"></a><span class='definition'>startTagOpenDeriv</span> <span class='varid'>p</span> <span class='varid'>qn</span>
<a name="line-400"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='layout'>(</span> <span class='varid'>show</span> <span class='varid'>p</span> <span class='varop'>++</span> <span class='str'>" expected, but Element "</span> <span class='varop'>++</span> <span class='varid'>universalName</span> <span class='varid'>qn</span> <span class='varop'>++</span> <span class='str'>" found"</span> <span class='layout'>)</span>
<a name="line-401"></a>
<a name="line-402"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-403"></a>
<a name="line-404"></a><span class='comment'>-- auxiliary functions for tracing</span>
<a name="line-405"></a><span class='comment'>{-
<a name="line-406"></a>attsDeriv' cx p ts
<a name="line-407"></a> = T.trace ("attsDeriv: p=" ++ (take 1000 . show) p ++ ", t=" ++ showXts ts) $
<a name="line-408"></a> T.trace ("res= " ++ (take 1000 . show) res) res
<a name="line-409"></a> where
<a name="line-410"></a> res = attsDeriv cx p ts
<a name="line-411"></a>
<a name="line-412"></a>attDeriv' cx p t
<a name="line-413"></a> = T.trace ("attDeriv: p=" ++ (take 1000 . show) p ++ ", t=" ++ showXts [t]) $
<a name="line-414"></a> T.trace ("res= " ++ (take 1000 . show) res) res
<a name="line-415"></a> where
<a name="line-416"></a> res = attDeriv cx p t
<a name="line-417"></a>-}</span>
<a name="line-418"></a>
<a name="line-419"></a><span class='comment'>-- | To compute the derivative of a pattern with respect to a sequence of attributes, </span>
<a name="line-420"></a><span class='comment'>-- simply compute the derivative with respect to each attribute in turn.</span>
<a name="line-421"></a>
<a name="line-422"></a><a name="attsDeriv"></a><span class='definition'>attsDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-423"></a>
<a name="line-424"></a><span class='definition'>attsDeriv</span> <span class='keyword'>_</span> <span class='varid'>p</span> <span class='conid'>[]</span>
<a name="line-425"></a> <span class='keyglyph'>=</span> <span class='varid'>p</span>
<a name="line-426"></a><span class='definition'>attsDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='layout'>(</span><span class='varid'>t</span> <span class='conop'>:</span> <span class='varid'>ts</span><span class='layout'>)</span>
<a name="line-427"></a> <span class='keyglyph'>|</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isAttr</span> <span class='varid'>t</span>
<a name="line-428"></a> <span class='keyglyph'>=</span> <span class='varid'>attsDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>t</span><span class='layout'>)</span> <span class='varid'>ts</span>
<a name="line-429"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-430"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='str'>"Call to attsDeriv with wrong arguments"</span>
<a name="line-431"></a>
<a name="line-432"></a><a name="attDeriv"></a><span class='definition'>attDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-433"></a>
<a name="line-434"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-435"></a> <span class='keyglyph'>=</span> <span class='varid'>after</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>att</span><span class='layout'>)</span> <span class='varid'>p2</span>
<a name="line-436"></a>
<a name="line-437"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-438"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>att</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>att</span><span class='layout'>)</span>
<a name="line-439"></a>
<a name="line-440"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Group</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-441"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span>
<a name="line-442"></a> <span class='layout'>(</span><span class='varid'>group</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>att</span><span class='layout'>)</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-443"></a> <span class='layout'>(</span><span class='varid'>group</span> <span class='varid'>p1</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>att</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-444"></a>
<a name="line-445"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Interleave</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-446"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span>
<a name="line-447"></a> <span class='layout'>(</span><span class='varid'>interleave</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p1</span> <span class='varid'>att</span><span class='layout'>)</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-448"></a> <span class='layout'>(</span><span class='varid'>interleave</span> <span class='varid'>p1</span> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p2</span> <span class='varid'>att</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-449"></a>
<a name="line-450"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-451"></a> <span class='keyglyph'>=</span> <span class='varid'>group</span>
<a name="line-452"></a> <span class='layout'>(</span><span class='varid'>attDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>att</span><span class='layout'>)</span>
<a name="line-453"></a> <span class='layout'>(</span><span class='varid'>choice</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='conid'>Empty</span><span class='layout'>)</span>
<a name="line-454"></a>
<a name="line-455"></a><span class='definition'>attDeriv</span> <span class='varid'>cx</span> <span class='layout'>(</span><span class='conid'>Attribute</span> <span class='varid'>nc</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-456"></a> <span class='keyglyph'>|</span> <span class='varid'>isa</span>
<a name="line-457"></a> <span class='varop'>&&</span>
<a name="line-458"></a> <span class='varid'>not</span> <span class='layout'>(</span><span class='varid'>contains</span> <span class='varid'>nc</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-459"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed1</span> <span class='varop'>$</span>
<a name="line-460"></a> <span class='str'>"Attribute with name "</span> <span class='varop'>++</span> <span class='varid'>nameClassToString</span> <span class='varid'>nc</span>
<a name="line-461"></a> <span class='varop'>++</span> <span class='str'>" expected, but "</span> <span class='varop'>++</span> <span class='varid'>universalName</span> <span class='varid'>qn</span> <span class='varop'>++</span> <span class='str'>" found"</span>
<a name="line-462"></a> <span class='keyglyph'>|</span> <span class='varid'>isa</span>
<a name="line-463"></a> <span class='varop'>&&</span>
<a name="line-464"></a> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>nullable</span> <span class='varid'>p</span>
<a name="line-465"></a> <span class='varop'>&&</span>
<a name="line-466"></a> <span class='varid'>whitespace</span> <span class='varid'>val</span>
<a name="line-467"></a> <span class='layout'>)</span>
<a name="line-468"></a> <span class='varop'>||</span> <span class='varid'>nullable</span> <span class='varid'>p'</span>
<a name="line-469"></a> <span class='layout'>)</span>
<a name="line-470"></a> <span class='keyglyph'>=</span> <span class='conid'>Empty</span>
<a name="line-471"></a> <span class='keyglyph'>|</span> <span class='varid'>isa</span>
<a name="line-472"></a> <span class='keyglyph'>=</span> <span class='varid'>err'</span> <span class='varid'>p'</span>
<a name="line-473"></a> <span class='keyword'>where</span>
<a name="line-474"></a> <span class='varid'>isa</span> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isAttr</span> <span class='varop'>$</span> <span class='varid'>att</span>
<a name="line-475"></a> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='varid'>fromJust</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getAttrName</span> <span class='varop'>$</span> <span class='varid'>att</span>
<a name="line-476"></a> <span class='varid'>av</span> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getChildren</span> <span class='varop'>$</span> <span class='varid'>att</span>
<a name="line-477"></a> <span class='varid'>val</span> <span class='keyglyph'>=</span> <span class='varid'>showXts</span> <span class='varid'>av</span>
<a name="line-478"></a> <span class='varid'>p'</span> <span class='keyglyph'>=</span> <span class='varid'>textDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>val</span>
<a name="line-479"></a>
<a name="line-480"></a> <span class='varid'>err'</span> <span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='layout'>(</span><span class='conid'>ErrMsg</span> <span class='sel'>_l</span> <span class='varid'>es</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-481"></a> <span class='keyglyph'>=</span> <span class='varid'>err''</span> <span class='layout'>(</span><span class='str'>": "</span> <span class='varop'>++</span> <span class='varid'>head</span> <span class='varid'>es</span><span class='layout'>)</span>
<a name="line-482"></a> <span class='varid'>err'</span> <span class='keyword'>_</span>
<a name="line-483"></a> <span class='keyglyph'>=</span> <span class='varid'>err''</span> <span class='str'>""</span>
<a name="line-484"></a> <span class='varid'>err''</span> <span class='varid'>e</span>
<a name="line-485"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed2</span> <span class='varop'>$</span>
<a name="line-486"></a> <span class='str'>"Attribute value \""</span> <span class='varop'>++</span> <span class='varid'>val</span> <span class='varop'>++</span>
<a name="line-487"></a> <span class='str'>"\" does not match datatype spec "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>p</span> <span class='varop'>++</span> <span class='varid'>e</span>
<a name="line-488"></a>
<a name="line-489"></a><span class='definition'>attDeriv</span> <span class='keyword'>_</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span>
<a name="line-490"></a> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-491"></a>
<a name="line-492"></a><span class='definition'>attDeriv</span> <span class='keyword'>_</span> <span class='sel'>_p</span> <span class='varid'>att</span>
<a name="line-493"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='varop'>$</span>
<a name="line-494"></a> <span class='str'>"No matching pattern for attribute '"</span> <span class='varop'>++</span> <span class='varid'>showXts</span> <span class='keyglyph'>[</span><span class='varid'>att</span><span class='keyglyph'>]</span> <span class='varop'>++</span> <span class='str'>"' found"</span>
<a name="line-495"></a>
<a name="line-496"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-497"></a><span class='comment'>-- </span>
<a name="line-498"></a><span class='comment'>-- | computes the derivative of a pattern with respect to a start tag close</span>
<a name="line-499"></a>
<a name="line-500"></a><a name="startTagCloseDeriv"></a><span class='definition'>startTagCloseDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-501"></a>
<a name="line-502"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-503"></a> <span class='keyglyph'>=</span> <span class='varid'>after</span> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p1</span><span class='layout'>)</span> <span class='varid'>p2</span>
<a name="line-504"></a>
<a name="line-505"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-506"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span>
<a name="line-507"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p1</span><span class='layout'>)</span>
<a name="line-508"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-509"></a>
<a name="line-510"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>Group</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-511"></a> <span class='keyglyph'>=</span> <span class='varid'>group</span>
<a name="line-512"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p1</span><span class='layout'>)</span>
<a name="line-513"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-514"></a>
<a name="line-515"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>Interleave</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-516"></a> <span class='keyglyph'>=</span> <span class='varid'>interleave</span>
<a name="line-517"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p1</span><span class='layout'>)</span>
<a name="line-518"></a> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-519"></a>
<a name="line-520"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>OneOrMore</span> <span class='varid'>p</span><span class='layout'>)</span>
<a name="line-521"></a> <span class='keyglyph'>=</span> <span class='varid'>oneOrMore</span> <span class='layout'>(</span><span class='varid'>startTagCloseDeriv</span> <span class='varid'>p</span><span class='layout'>)</span>
<a name="line-522"></a>
<a name="line-523"></a><span class='definition'>startTagCloseDeriv</span> <span class='layout'>(</span><span class='conid'>Attribute</span> <span class='varid'>nc</span> <span class='keyword'>_</span><span class='layout'>)</span>
<a name="line-524"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed1</span> <span class='varop'>$</span>
<a name="line-525"></a> <span class='str'>"Attribut with name, "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>nc</span> <span class='varop'>++</span>
<a name="line-526"></a> <span class='str'>" expected, but no more attributes found"</span>
<a name="line-527"></a>
<a name="line-528"></a><span class='definition'>startTagCloseDeriv</span> <span class='varid'>p</span>
<a name="line-529"></a> <span class='keyglyph'>=</span> <span class='varid'>p</span>
<a name="line-530"></a>
<a name="line-531"></a>
<a name="line-532"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-533"></a><span class='comment'>-- </span>
<a name="line-534"></a><span class='comment'>-- | Computing the derivative of a pattern with respect to a list of children involves </span>
<a name="line-535"></a><span class='comment'>-- computing the derivative with respect to each pattern in turn, except</span>
<a name="line-536"></a><span class='comment'>-- that whitespace requires special treatment.</span>
<a name="line-537"></a>
<a name="line-538"></a><a name="childrenDeriv"></a><span class='definition'>childrenDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-539"></a><span class='definition'>childrenDeriv</span> <span class='sel'>_cx</span> <span class='varid'>p</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span>
<a name="line-540"></a> <span class='keyglyph'>=</span> <span class='varid'>p</span>
<a name="line-541"></a>
<a name="line-542"></a><span class='definition'>childrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='conid'>[]</span>
<a name="line-543"></a> <span class='keyglyph'>=</span> <span class='varid'>childrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='keyglyph'>[</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span> <span class='str'>""</span><span class='keyglyph'>]</span>
<a name="line-544"></a>
<a name="line-545"></a><span class='definition'>childrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='keyglyph'>[</span><span class='varid'>tt</span><span class='keyglyph'>]</span>
<a name="line-546"></a> <span class='keyglyph'>|</span> <span class='varid'>ist</span>
<a name="line-547"></a> <span class='varop'>&&</span>
<a name="line-548"></a> <span class='varid'>whitespace</span> <span class='varid'>s</span>
<a name="line-549"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='varid'>p</span> <span class='varid'>p1</span>
<a name="line-550"></a> <span class='keyglyph'>|</span> <span class='varid'>ist</span>
<a name="line-551"></a> <span class='keyglyph'>=</span> <span class='varid'>p1</span>
<a name="line-552"></a> <span class='keyword'>where</span>
<a name="line-553"></a> <span class='varid'>ist</span> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isText</span> <span class='varid'>tt</span>
<a name="line-554"></a> <span class='varid'>s</span> <span class='keyglyph'>=</span> <span class='varid'>fromJust</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getText</span> <span class='varop'>$</span> <span class='varid'>tt</span>
<a name="line-555"></a> <span class='varid'>p1</span> <span class='keyglyph'>=</span> <span class='varid'>childDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>tt</span>
<a name="line-556"></a>
<a name="line-557"></a><span class='definition'>childrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>children</span>
<a name="line-558"></a> <span class='keyglyph'>=</span> <span class='varid'>stripChildrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>children</span>
<a name="line-559"></a>
<a name="line-560"></a><a name="stripChildrenDeriv"></a><span class='definition'>stripChildrenDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Context</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-561"></a><span class='definition'>stripChildrenDeriv</span> <span class='keyword'>_</span> <span class='varid'>p</span> <span class='conid'>[]</span>
<a name="line-562"></a> <span class='keyglyph'>=</span> <span class='varid'>p</span>
<a name="line-563"></a>
<a name="line-564"></a><span class='definition'>stripChildrenDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='layout'>(</span><span class='varid'>h</span><span class='conop'>:</span><span class='varid'>t</span><span class='layout'>)</span>
<a name="line-565"></a> <span class='keyglyph'>=</span> <span class='varid'>stripChildrenDeriv</span> <span class='varid'>cx</span>
<a name="line-566"></a> <span class='layout'>(</span> <span class='keyword'>if</span> <span class='varid'>strip</span> <span class='varid'>h</span>
<a name="line-567"></a> <span class='keyword'>then</span> <span class='varid'>p</span>
<a name="line-568"></a> <span class='keyword'>else</span> <span class='layout'>(</span><span class='varid'>childDeriv</span> <span class='varid'>cx</span> <span class='varid'>p</span> <span class='varid'>h</span><span class='layout'>)</span>
<a name="line-569"></a> <span class='layout'>)</span> <span class='varid'>t</span>
<a name="line-570"></a>
<a name="line-571"></a>
<a name="line-572"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-573"></a><span class='comment'>-- </span>
<a name="line-574"></a><span class='comment'>-- | computes the derivative of a pattern with respect to a end tag</span>
<a name="line-575"></a>
<a name="line-576"></a><a name="endTagDeriv"></a><span class='definition'>endTagDeriv</span> <span class='keyglyph'>::</span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-577"></a><span class='definition'>endTagDeriv</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-578"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='layout'>(</span><span class='varid'>endTagDeriv</span> <span class='varid'>p1</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>endTagDeriv</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-579"></a>
<a name="line-580"></a><span class='definition'>endTagDeriv</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-581"></a> <span class='keyglyph'>|</span> <span class='varid'>nullable</span> <span class='varid'>p1</span>
<a name="line-582"></a> <span class='keyglyph'>=</span> <span class='varid'>p2</span>
<a name="line-583"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-584"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='varop'>$</span>
<a name="line-585"></a> <span class='varid'>show</span> <span class='varid'>p1</span> <span class='varop'>++</span> <span class='str'>" expected"</span>
<a name="line-586"></a>
<a name="line-587"></a><span class='definition'>endTagDeriv</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span>
<a name="line-588"></a> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-589"></a>
<a name="line-590"></a><span class='definition'>endTagDeriv</span> <span class='keyword'>_</span>
<a name="line-591"></a> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='str'>"Call to endTagDeriv with wrong arguments"</span>
<a name="line-592"></a>
<a name="line-593"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-594"></a><span class='comment'>-- </span>
<a name="line-595"></a><span class='comment'>-- | applies a function (first parameter) to the second part of a after pattern</span>
<a name="line-596"></a>
<a name="line-597"></a><a name="applyAfter"></a><span class='definition'>applyAfter</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-598"></a>
<a name="line-599"></a><span class='definition'>applyAfter</span> <span class='varid'>f</span> <span class='layout'>(</span><span class='conid'>After</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>after</span> <span class='varid'>p1</span> <span class='layout'>(</span><span class='varid'>f</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-600"></a><span class='definition'>applyAfter</span> <span class='varid'>f</span> <span class='layout'>(</span><span class='conid'>Choice</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='layout'>(</span><span class='varid'>applyAfter</span> <span class='varid'>f</span> <span class='varid'>p1</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>applyAfter</span> <span class='varid'>f</span> <span class='varid'>p2</span><span class='layout'>)</span>
<a name="line-601"></a><span class='definition'>applyAfter</span> <span class='keyword'>_</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NotAllowed</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-602"></a><span class='definition'>applyAfter</span> <span class='keyword'>_</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='varid'>notAllowed</span> <span class='str'>"Call to applyAfter with wrong arguments"</span>
<a name="line-603"></a>
<a name="line-604"></a><span class='comment'>-- --------------------</span>
<a name="line-605"></a>
<a name="line-606"></a><span class='comment'>-- mothers little helpers</span>
<a name="line-607"></a>
<a name="line-608"></a><a name="strip"></a><span class='definition'>strip</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-609"></a><span class='definition'>strip</span> <span class='keyglyph'>=</span> <span class='varid'>maybe</span> <span class='conid'>False</span> <span class='varid'>whitespace</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getText</span>
<a name="line-610"></a>
<a name="line-611"></a><a name="whitespace"></a><span class='definition'>whitespace</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-612"></a><span class='definition'>whitespace</span> <span class='keyglyph'>=</span> <span class='varid'>all</span> <span class='varid'>isXmlSpaceChar</span>
<a name="line-613"></a>
<a name="line-614"></a><a name="showXts"></a><span class='definition'>showXts</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>String</span>
<a name="line-615"></a><span class='definition'>showXts</span> <span class='keyglyph'>=</span> <span class='varid'>concat</span> <span class='varop'>.</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>xshow</span> <span class='varop'>$</span> <span class='varid'>arrL</span> <span class='varid'>id</span><span class='layout'>)</span>
<a name="line-616"></a>
<a name="line-617"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
</html>