hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-Arrow-XmlArrow.html
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<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.Arrow.XmlArrow
<a name="line-5"></a> Copyright : Copyright (C) 2005 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 : experimental
<a name="line-10"></a> Portability: portable
<a name="line-11"></a> Version : $Id: XmlArrow.hs,v 1.34 2006/11/02 16:43:39 hxml Exp $
<a name="line-12"></a>
<a name="line-13"></a> Basic arrows for processing XML documents
<a name="line-14"></a>
<a name="line-15"></a> All arrows use IO and a global state for options, errorhandling, ...
<a name="line-16"></a>
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-20"></a>
<a name="line-21"></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'>Arrow</span><span class='varop'>.</span><span class='conid'>XmlArrow</span>
<a name="line-22"></a> <span class='layout'>(</span> <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'>Arrow</span><span class='varop'>.</span><span class='conid'>XmlArrow</span> <span class='layout'>)</span>
<a name="line-23"></a><span class='keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='keyword'>import</span> <span class='conid'>Control</span><span class='varop'>.</span><span class='conid'>Arrow</span> <span class='comment'>-- classes</span>
<a name="line-28"></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'>ArrowList</span>
<a name="line-29"></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'>ArrowIf</span>
<a name="line-30"></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'>ArrowTree</span>
<a name="line-31"></a>
<a name="line-32"></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'>ListArrow</span> <span class='comment'>-- arrow types</span>
<a name="line-33"></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'>StateListArrow</span>
<a name="line-34"></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'>IOListArrow</span>
<a name="line-35"></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'>IOStateListArrow</span>
<a name="line-36"></a>
<a name="line-37"></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-38"></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-39"></a> <span class='layout'>(</span> <span class='varid'>isXmlSpaceChar</span>
<a name="line-40"></a> <span class='layout'>)</span>
<a name="line-41"></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-42"></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'>ShowXml</span> <span class='keyword'>as</span> <span class='conid'>XS</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='comment'>{- | Arrows for processing 'Text.XML.HXT.DOM.TypeDefs.XmlTree's
<a name="line-45"></a>
<a name="line-46"></a>These arrows can be grouped into predicates, selectors, constructors, and transformers.
<a name="line-47"></a>
<a name="line-48"></a>All predicates (tests) act like 'Control.Arrow.ArrowIf.none' for failure and 'Control.Arrow.ArrowIf.this' for success.
<a name="line-49"></a>A logical and can be formed by @ a1 >>> a2 @, a locical or by @ a1 \<+\> a2 @.
<a name="line-50"></a>
<a name="line-51"></a>Selector arrows will fail, when applied to wrong input, e.g. selecting the text of a node with 'getText'
<a name="line-52"></a>will fail when applied to a none text node.
<a name="line-53"></a>
<a name="line-54"></a>Edit arrows will remain the input unchanged, when applied to wrong argument, e.g. editing the content of a text node
<a name="line-55"></a>with 'changeText' applied to an element node will return the unchanged element node.
<a name="line-56"></a>-}</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='keyword'>infixl</span> <span class='num'>7</span> <span class='varop'>+=</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="ArrowXml"></a><span class='keyword'>class</span> <span class='layout'>(</span><span class='conid'>Arrow</span> <span class='varid'>a</span><span class='layout'>,</span> <span class='conid'>ArrowList</span> <span class='varid'>a</span><span class='layout'>,</span> <span class='conid'>ArrowTree</span> <span class='varid'>a</span><span class='layout'>)</span> <span class='keyglyph'>=></span> <span class='conid'>ArrowXml</span> <span class='varid'>a</span> <span class='keyword'>where</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='comment'>-- discriminating predicates</span>
<a name="line-63"></a>
<a name="line-64"></a> <span class='comment'>-- | test for text nodes</span>
<a name="line-65"></a> <span class='varid'>isText</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-66"></a> <span class='varid'>isText</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isText</span>
<a name="line-67"></a>
<a name="line-68"></a> <span class='comment'>-- | test for char reference, used during parsing</span>
<a name="line-69"></a> <span class='varid'>isCharRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-70"></a> <span class='varid'>isCharRef</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isCharRef</span>
<a name="line-71"></a>
<a name="line-72"></a> <span class='comment'>-- | test for entity reference, used during parsing</span>
<a name="line-73"></a> <span class='varid'>isEntityRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-74"></a> <span class='varid'>isEntityRef</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isEntityRef</span>
<a name="line-75"></a>
<a name="line-76"></a> <span class='comment'>-- | test for comment</span>
<a name="line-77"></a> <span class='varid'>isCmt</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-78"></a> <span class='varid'>isCmt</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isCmt</span>
<a name="line-79"></a>
<a name="line-80"></a> <span class='comment'>-- | test for CDATA section, used during parsing</span>
<a name="line-81"></a> <span class='varid'>isCdata</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-82"></a> <span class='varid'>isCdata</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isCdata</span>
<a name="line-83"></a>
<a name="line-84"></a> <span class='comment'>-- | test for processing instruction</span>
<a name="line-85"></a> <span class='varid'>isPi</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-86"></a> <span class='varid'>isPi</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isPi</span>
<a name="line-87"></a>
<a name="line-88"></a> <span class='comment'>-- | test for processing instruction \<?xml ...\></span>
<a name="line-89"></a> <span class='varid'>isXmlPi</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-90"></a> <span class='varid'>isXmlPi</span> <span class='keyglyph'>=</span> <span class='varid'>isPi</span> <span class='varop'>>>></span> <span class='varid'>hasName</span> <span class='str'>"xml"</span>
<a name="line-91"></a>
<a name="line-92"></a> <span class='comment'>-- | test for element</span>
<a name="line-93"></a> <span class='varid'>isElem</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-94"></a> <span class='varid'>isElem</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isElem</span>
<a name="line-95"></a>
<a name="line-96"></a> <span class='comment'>-- | test for DTD part, used during parsing</span>
<a name="line-97"></a> <span class='varid'>isDTD</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-98"></a> <span class='varid'>isDTD</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isDTD</span>
<a name="line-99"></a>
<a name="line-100"></a> <span class='comment'>-- | test for attribute tree</span>
<a name="line-101"></a> <span class='varid'>isAttr</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-102"></a> <span class='varid'>isAttr</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isAttr</span>
<a name="line-103"></a>
<a name="line-104"></a> <span class='comment'>-- | test for error message</span>
<a name="line-105"></a> <span class='varid'>isError</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-106"></a> <span class='varid'>isError</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isError</span>
<a name="line-107"></a>
<a name="line-108"></a> <span class='comment'>-- | test for root node (element with name \"\/\")</span>
<a name="line-109"></a> <span class='varid'>isRoot</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-110"></a> <span class='varid'>isRoot</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isRoot</span>
<a name="line-111"></a>
<a name="line-112"></a> <span class='comment'>-- | test for text nodes with text, for which a predicate holds</span>
<a name="line-113"></a> <span class='comment'>--</span>
<a name="line-114"></a> <span class='comment'>-- example: @hasText (all (\`elem\` \" \\t\\n\"))@ check for text nodes with only whitespace content</span>
<a name="line-115"></a>
<a name="line-116"></a> <span class='varid'>hasText</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span><span class='layout'>)</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='varid'>hasText</span> <span class='varid'>p</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>isText</span> <span class='varop'>>>></span> <span class='varid'>getText</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-118"></a>
<a name="line-119"></a> <span class='comment'>-- | test for text nodes with only white space</span>
<a name="line-120"></a> <span class='comment'>--</span>
<a name="line-121"></a> <span class='comment'>-- implemented with 'hasTest'</span>
<a name="line-122"></a>
<a name="line-123"></a> <span class='varid'>isWhiteSpace</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-124"></a> <span class='varid'>isWhiteSpace</span> <span class='keyglyph'>=</span> <span class='varid'>hasText</span> <span class='layout'>(</span><span class='varid'>all</span> <span class='varid'>isXmlSpaceChar</span><span class='layout'>)</span>
<a name="line-125"></a>
<a name="line-126"></a> <span class='comment'>-- |</span>
<a name="line-127"></a> <span class='comment'>-- test whether a node (element, attribute, pi) has a name with a special property</span>
<a name="line-128"></a>
<a name="line-129"></a> <span class='varid'>hasNameWith</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-130"></a> <span class='varid'>hasNameWith</span> <span class='varid'>p</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getQName</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-131"></a>
<a name="line-132"></a> <span class='comment'>-- |</span>
<a name="line-133"></a> <span class='comment'>-- test whether a node (element, attribute, pi) has a specific qualified name</span>
<a name="line-134"></a> <span class='comment'>-- useful only after namespace propagation</span>
<a name="line-135"></a> <span class='varid'>hasQName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-136"></a> <span class='varid'>hasQName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getQName</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-137"></a>
<a name="line-138"></a> <span class='comment'>-- |</span>
<a name="line-139"></a> <span class='comment'>-- test whether a node has a specific name (prefix:localPart ore localPart),</span>
<a name="line-140"></a> <span class='comment'>-- generally useful, even without namespace handling</span>
<a name="line-141"></a> <span class='varid'>hasName</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-142"></a> <span class='varid'>hasName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getName</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-143"></a>
<a name="line-144"></a> <span class='comment'>-- |</span>
<a name="line-145"></a> <span class='comment'>-- test whether a node has a specific name as local part,</span>
<a name="line-146"></a> <span class='comment'>-- useful only after namespace propagation</span>
<a name="line-147"></a> <span class='varid'>hasLocalPart</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-148"></a> <span class='varid'>hasLocalPart</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getLocalPart</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-149"></a>
<a name="line-150"></a> <span class='comment'>-- |</span>
<a name="line-151"></a> <span class='comment'>-- test whether a node has a specific name prefix,</span>
<a name="line-152"></a> <span class='comment'>-- useful only after namespace propagation</span>
<a name="line-153"></a> <span class='varid'>hasNamePrefix</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-154"></a> <span class='varid'>hasNamePrefix</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getNamePrefix</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-155"></a>
<a name="line-156"></a> <span class='comment'>-- |</span>
<a name="line-157"></a> <span class='comment'>-- test whether a node has a specific namespace URI</span>
<a name="line-158"></a> <span class='comment'>-- useful only after namespace propagation</span>
<a name="line-159"></a> <span class='varid'>hasNamespaceUri</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-160"></a> <span class='varid'>hasNamespaceUri</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getNamespaceUri</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-161"></a>
<a name="line-162"></a> <span class='comment'>-- |</span>
<a name="line-163"></a> <span class='comment'>-- test whether an element node has an attribute node with a specific name</span>
<a name="line-164"></a> <span class='varid'>hasAttr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-165"></a> <span class='varid'>hasAttr</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-166"></a>
<a name="line-167"></a> <span class='comment'>-- |</span>
<a name="line-168"></a> <span class='comment'>-- test whether an element node has an attribute node with a specific qualified name</span>
<a name="line-169"></a> <span class='varid'>hasQAttr</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-170"></a> <span class='varid'>hasQAttr</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasQName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-171"></a>
<a name="line-172"></a> <span class='comment'>-- |</span>
<a name="line-173"></a> <span class='comment'>-- test whether an element node has an attribute with a specific value</span>
<a name="line-174"></a> <span class='varid'>hasAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-175"></a> <span class='varid'>hasAttrValue</span> <span class='varid'>n</span> <span class='varid'>p</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>xshow</span> <span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-176"></a>
<a name="line-177"></a> <span class='comment'>-- |</span>
<a name="line-178"></a> <span class='comment'>-- test whether an element node has an attribute with a qualified name and a specific value</span>
<a name="line-179"></a> <span class='varid'>hasQAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-180"></a> <span class='varid'>hasQAttrValue</span> <span class='varid'>n</span> <span class='varid'>p</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasQName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>xshow</span> <span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='varid'>p</span><span class='layout'>)</span> <span class='varop'>`guards`</span> <span class='varid'>this</span>
<a name="line-181"></a>
<a name="line-182"></a> <span class='comment'>-- constructor arrows ------------------------------------------------------------</span>
<a name="line-183"></a>
<a name="line-184"></a> <span class='comment'>-- | text node construction arrow</span>
<a name="line-185"></a> <span class='varid'>mkText</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>String</span> <span class='conid'>XmlTree</span>
<a name="line-186"></a> <span class='varid'>mkText</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span>
<a name="line-187"></a>
<a name="line-188"></a> <span class='comment'>-- | char reference construction arrow, useful for document output</span>
<a name="line-189"></a> <span class='varid'>mkCharRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>Int</span> <span class='conid'>XmlTree</span>
<a name="line-190"></a> <span class='varid'>mkCharRef</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkCharRef</span>
<a name="line-191"></a>
<a name="line-192"></a> <span class='comment'>-- | entity reference construction arrow, useful for document output</span>
<a name="line-193"></a> <span class='varid'>mkEntityRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>String</span> <span class='conid'>XmlTree</span>
<a name="line-194"></a> <span class='varid'>mkEntityRef</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkEntityRef</span>
<a name="line-195"></a>
<a name="line-196"></a> <span class='comment'>-- | comment node construction, useful for document output</span>
<a name="line-197"></a> <span class='varid'>mkCmt</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>String</span> <span class='conid'>XmlTree</span>
<a name="line-198"></a> <span class='varid'>mkCmt</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkCmt</span>
<a name="line-199"></a>
<a name="line-200"></a> <span class='comment'>-- | CDATA construction, useful for document output</span>
<a name="line-201"></a> <span class='varid'>mkCdata</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>String</span> <span class='conid'>XmlTree</span>
<a name="line-202"></a> <span class='varid'>mkCdata</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkCdata</span>
<a name="line-203"></a>
<a name="line-204"></a> <span class='comment'>-- | error node construction, useful only internally</span>
<a name="line-205"></a> <span class='varid'>mkError</span> <span class='keyglyph'>::</span> <span class='conid'>Int</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>String</span> <span class='conid'>XmlTree</span>
<a name="line-206"></a> <span class='varid'>mkError</span> <span class='varid'>level</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkError</span> <span class='varid'>level</span><span class='layout'>)</span>
<a name="line-207"></a>
<a name="line-208"></a> <span class='comment'>-- | element construction:</span>
<a name="line-209"></a> <span class='comment'>-- | the attributes and the content of the element are computed by applying arrows</span>
<a name="line-210"></a> <span class='comment'>-- to the input</span>
<a name="line-211"></a> <span class='varid'>mkElement</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-212"></a> <span class='varid'>mkElement</span> <span class='varid'>n</span> <span class='varid'>af</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>listA</span> <span class='varid'>af</span> <span class='varop'>&&&</span> <span class='varid'>listA</span> <span class='varid'>cf</span><span class='layout'>)</span>
<a name="line-213"></a> <span class='varop'>>>></span>
<a name="line-214"></a> <span class='varid'>arr2</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>al</span> <span class='varid'>cl</span> <span class='keyglyph'>-></span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkElement</span> <span class='varid'>n</span> <span class='varid'>al</span> <span class='varid'>cl</span><span class='layout'>)</span>
<a name="line-215"></a> <span class='comment'>-- | attribute node construction:</span>
<a name="line-216"></a> <span class='comment'>-- | the attribute value is computed by applying an arrow to the input</span>
<a name="line-217"></a> <span class='varid'>mkAttr</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-218"></a> <span class='varid'>mkAttr</span> <span class='varid'>qn</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varid'>f</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkAttr</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-219"></a>
<a name="line-220"></a> <span class='comment'>-- | processing instruction construction:</span>
<a name="line-221"></a> <span class='comment'>-- | the content of the processing instruction is computed by applying an arrow to the input</span>
<a name="line-222"></a> <span class='varid'>mkPi</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-223"></a> <span class='varid'>mkPi</span> <span class='varid'>qn</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varid'>f</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkPi</span> <span class='varid'>qn</span><span class='layout'>)</span>
<a name="line-224"></a>
<a name="line-225"></a> <span class='comment'>-- convenient arrows for constructors --------------------------------------------------</span>
<a name="line-226"></a>
<a name="line-227"></a> <span class='comment'>-- | convenient arrow for element construction, more comfortable variant of 'mkElement'</span>
<a name="line-228"></a> <span class='comment'>--</span>
<a name="line-229"></a> <span class='comment'>-- example for simplifying 'mkElement' :</span>
<a name="line-230"></a> <span class='comment'>--</span>
<a name="line-231"></a> <span class='comment'>-- > mkElement qn (a1 <+> ... <+> ai) (c1 <+> ... <+> cj)</span>
<a name="line-232"></a> <span class='comment'>--</span>
<a name="line-233"></a> <span class='comment'>-- equals</span>
<a name="line-234"></a> <span class='comment'>--</span>
<a name="line-235"></a> <span class='comment'>-- > mkqelem qn [a1,...,ai] [c1,...,cj]</span>
<a name="line-236"></a>
<a name="line-237"></a> <span class='varid'>mkqelem</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-238"></a> <span class='varid'>mkqelem</span> <span class='varid'>n</span> <span class='varid'>afs</span> <span class='varid'>cfs</span> <span class='keyglyph'>=</span> <span class='varid'>mkElement</span> <span class='varid'>n</span> <span class='layout'>(</span><span class='varid'>catA</span> <span class='varid'>afs</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>catA</span> <span class='varid'>cfs</span><span class='layout'>)</span>
<a name="line-239"></a>
<a name="line-240"></a> <span class='comment'>-- | convenient arrow for element construction with strings instead of qualified names as tagnames, see also 'mkElement' and 'mkelem'</span>
<a name="line-241"></a> <span class='varid'>mkelem</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-242"></a> <span class='varid'>mkelem</span> <span class='varid'>n</span> <span class='varid'>afs</span> <span class='varid'>cfs</span> <span class='keyglyph'>=</span> <span class='varid'>mkElement</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>catA</span> <span class='varid'>afs</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>catA</span> <span class='varid'>cfs</span><span class='layout'>)</span>
<a name="line-243"></a>
<a name="line-244"></a> <span class='comment'>-- | convenient arrow for element constrution with attributes but without content, simple variant of 'mkelem' and 'mkElement'</span>
<a name="line-245"></a> <span class='varid'>aelem</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-246"></a> <span class='varid'>aelem</span> <span class='varid'>n</span> <span class='varid'>afs</span> <span class='keyglyph'>=</span> <span class='varid'>catA</span> <span class='varid'>afs</span> <span class='varop'>>.</span> <span class='keyglyph'>\</span> <span class='varid'>al</span> <span class='keyglyph'>-></span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkElement</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varid'>al</span> <span class='conid'>[]</span>
<a name="line-247"></a>
<a name="line-248"></a> <span class='comment'>-- | convenient arrow for simple element constrution without attributes, simple variant of 'mkelem' and 'mkElement'</span>
<a name="line-249"></a> <span class='varid'>selem</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-250"></a> <span class='varid'>selem</span> <span class='varid'>n</span> <span class='varid'>cfs</span> <span class='keyglyph'>=</span> <span class='varid'>catA</span> <span class='varid'>cfs</span> <span class='varop'>>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkElement</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='conid'>[]</span>
<a name="line-251"></a>
<a name="line-252"></a> <span class='comment'>-- | convenient arrow for constrution of empty elements without attributes, simple variant of 'mkelem' and 'mkElement'</span>
<a name="line-253"></a> <span class='varid'>eelem</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-254"></a> <span class='varid'>eelem</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkElement</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='conid'>[]</span> <span class='conid'>[]</span><span class='layout'>)</span>
<a name="line-255"></a>
<a name="line-256"></a> <span class='comment'>-- | construction of an element node with name \"\/\" for document roots</span>
<a name="line-257"></a> <span class='varid'>root</span> <span class='keyglyph'>::</span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-258"></a> <span class='varid'>root</span> <span class='keyglyph'>=</span> <span class='varid'>mkelem</span> <span class='varid'>t_root</span>
<a name="line-259"></a>
<a name="line-260"></a> <span class='comment'>-- | alias for 'mkAttr'</span>
<a name="line-261"></a> <span class='varid'>qattr</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-262"></a> <span class='varid'>qattr</span> <span class='keyglyph'>=</span> <span class='varid'>mkAttr</span>
<a name="line-263"></a>
<a name="line-264"></a> <span class='comment'>-- | convenient arrow for attribute constrution, simple variant of 'mkAttr'</span>
<a name="line-265"></a> <span class='varid'>attr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-266"></a> <span class='varid'>attr</span> <span class='keyglyph'>=</span> <span class='varid'>mkAttr</span> <span class='varop'>.</span> <span class='varid'>mkSNsName</span>
<a name="line-267"></a>
<a name="line-268"></a> <span class='comment'>-- constant arrows (ignoring the input) for tree construction ------------------------------</span>
<a name="line-269"></a>
<a name="line-270"></a> <span class='comment'>-- | constant arrow for text nodes</span>
<a name="line-271"></a> <span class='varid'>txt</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-272"></a> <span class='varid'>txt</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span>
<a name="line-273"></a>
<a name="line-274"></a> <span class='comment'>-- | constant arrow for char reference nodes</span>
<a name="line-275"></a> <span class='varid'>charRef</span> <span class='keyglyph'>::</span> <span class='conid'>Int</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-276"></a> <span class='varid'>charRef</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkCharRef</span>
<a name="line-277"></a>
<a name="line-278"></a> <span class='comment'>-- | constant arrow for entity reference nodes</span>
<a name="line-279"></a> <span class='varid'>entityRef</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-280"></a> <span class='varid'>entityRef</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkEntityRef</span>
<a name="line-281"></a>
<a name="line-282"></a> <span class='comment'>-- | constant arrow for comment</span>
<a name="line-283"></a> <span class='varid'>cmt</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-284"></a> <span class='varid'>cmt</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkCmt</span>
<a name="line-285"></a>
<a name="line-286"></a> <span class='comment'>-- | constant arrow for warning</span>
<a name="line-287"></a> <span class='varid'>warn</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-288"></a> <span class='varid'>warn</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkError</span> <span class='varid'>c_warn</span><span class='layout'>)</span>
<a name="line-289"></a>
<a name="line-290"></a> <span class='comment'>-- | constant arrow for errors</span>
<a name="line-291"></a> <span class='varid'>err</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-292"></a> <span class='varid'>err</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkError</span> <span class='varid'>c_err</span><span class='layout'>)</span>
<a name="line-293"></a>
<a name="line-294"></a> <span class='comment'>-- | constant arrow for fatal errors</span>
<a name="line-295"></a> <span class='varid'>fatal</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-296"></a> <span class='varid'>fatal</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>.</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkError</span> <span class='varid'>c_fatal</span><span class='layout'>)</span>
<a name="line-297"></a>
<a name="line-298"></a> <span class='comment'>-- | constant arrow for simple processing instructions, see 'mkPi'</span>
<a name="line-299"></a> <span class='varid'>spi</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-300"></a> <span class='varid'>spi</span> <span class='varid'>piName</span> <span class='varid'>piCont</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkPi</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>piName</span><span class='layout'>)</span> <span class='keyglyph'>[</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span> <span class='varid'>piCont</span><span class='keyglyph'>]</span><span class='layout'>)</span>
<a name="line-301"></a>
<a name="line-302"></a> <span class='comment'>-- | constant arrow for attribute nodes, attribute name is a qualified name and value is a text,</span>
<a name="line-303"></a> <span class='comment'>-- | see also 'mkAttr', 'qattr', 'attr'</span>
<a name="line-304"></a> <span class='varid'>sqattr</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-305"></a> <span class='varid'>sqattr</span> <span class='varid'>an</span> <span class='varid'>av</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkAttr</span> <span class='varid'>an</span> <span class='keyglyph'>[</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span> <span class='varid'>av</span><span class='keyglyph'>]</span><span class='layout'>)</span>
<a name="line-306"></a>
<a name="line-307"></a> <span class='comment'>-- | constant arrow for attribute nodes, attribute name and value are</span>
<a name="line-308"></a> <span class='comment'>-- | given by parameters, see 'mkAttr'</span>
<a name="line-309"></a> <span class='varid'>sattr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-310"></a> <span class='varid'>sattr</span> <span class='varid'>an</span> <span class='varid'>av</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkAttr</span> <span class='layout'>(</span><span class='varid'>mkSNsName</span> <span class='varid'>an</span><span class='layout'>)</span> <span class='keyglyph'>[</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkText</span> <span class='varid'>av</span><span class='keyglyph'>]</span><span class='layout'>)</span>
<a name="line-311"></a>
<a name="line-312"></a> <span class='comment'>-- selector arrows --------------------------------------------------</span>
<a name="line-313"></a>
<a name="line-314"></a> <span class='comment'>-- | select the text of a text node</span>
<a name="line-315"></a> <span class='varid'>getText</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-316"></a> <span class='varid'>getText</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getText</span><span class='layout'>)</span>
<a name="line-317"></a>
<a name="line-318"></a> <span class='comment'>-- | select the value of a char reference</span>
<a name="line-319"></a> <span class='varid'>getCharRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>Int</span>
<a name="line-320"></a> <span class='varid'>getCharRef</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getCharRef</span><span class='layout'>)</span>
<a name="line-321"></a>
<a name="line-322"></a> <span class='comment'>-- | select the name of a entity reference node</span>
<a name="line-323"></a> <span class='varid'>getEntityRef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-324"></a> <span class='varid'>getEntityRef</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getEntityRef</span><span class='layout'>)</span>
<a name="line-325"></a>
<a name="line-326"></a> <span class='comment'>-- | select the comment of a comment node</span>
<a name="line-327"></a> <span class='varid'>getCmt</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-328"></a> <span class='varid'>getCmt</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getCmt</span><span class='layout'>)</span>
<a name="line-329"></a>
<a name="line-330"></a> <span class='comment'>-- | select the content of a CDATA node</span>
<a name="line-331"></a> <span class='varid'>getCdata</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-332"></a> <span class='varid'>getCdata</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getCdata</span><span class='layout'>)</span>
<a name="line-333"></a>
<a name="line-334"></a> <span class='comment'>-- | select the name of a processing instruction</span>
<a name="line-335"></a> <span class='varid'>getPiName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>QName</span>
<a name="line-336"></a> <span class='varid'>getPiName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getPiName</span><span class='layout'>)</span>
<a name="line-337"></a>
<a name="line-338"></a> <span class='comment'>-- | select the content of a processing instruction</span>
<a name="line-339"></a> <span class='varid'>getPiContent</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-340"></a> <span class='varid'>getPiContent</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>fromMaybe</span> <span class='conid'>[]</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getPiContent</span><span class='layout'>)</span>
<a name="line-341"></a>
<a name="line-342"></a> <span class='comment'>-- | select the name of an element node</span>
<a name="line-343"></a> <span class='varid'>getElemName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>QName</span>
<a name="line-344"></a> <span class='varid'>getElemName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getElemName</span><span class='layout'>)</span>
<a name="line-345"></a>
<a name="line-346"></a> <span class='comment'>-- | select the attribute list of an element node</span>
<a name="line-347"></a> <span class='varid'>getAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-348"></a> <span class='varid'>getAttrl</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>fromMaybe</span> <span class='conid'>[]</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getAttrl</span><span class='layout'>)</span>
<a name="line-349"></a>
<a name="line-350"></a> <span class='comment'>-- | select the DTD type of a DTD node</span>
<a name="line-351"></a> <span class='varid'>getDTDPart</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>DTDElem</span>
<a name="line-352"></a> <span class='varid'>getDTDPart</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-353"></a>
<a name="line-354"></a> <span class='comment'>-- | select the DTD attributes of a DTD node</span>
<a name="line-355"></a> <span class='varid'>getDTDAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>Attributes</span>
<a name="line-356"></a> <span class='varid'>getDTDAttrl</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDAttrl</span><span class='layout'>)</span>
<a name="line-357"></a>
<a name="line-358"></a> <span class='comment'>-- | select the name of an attribute</span>
<a name="line-359"></a> <span class='varid'>getAttrName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>QName</span>
<a name="line-360"></a> <span class='varid'>getAttrName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getAttrName</span><span class='layout'>)</span>
<a name="line-361"></a>
<a name="line-362"></a> <span class='comment'>-- | select the error level (c_warn, c_err, c_fatal) from an error node</span>
<a name="line-363"></a> <span class='varid'>getErrorLevel</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>Int</span>
<a name="line-364"></a> <span class='varid'>getErrorLevel</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getErrorLevel</span><span class='layout'>)</span>
<a name="line-365"></a>
<a name="line-366"></a> <span class='comment'>-- | select the error message from an error node</span>
<a name="line-367"></a> <span class='varid'>getErrorMsg</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-368"></a> <span class='varid'>getErrorMsg</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getErrorMsg</span><span class='layout'>)</span>
<a name="line-369"></a>
<a name="line-370"></a> <span class='comment'>-- | select the qualified name from an element, attribute or pi</span>
<a name="line-371"></a> <span class='varid'>getQName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>QName</span>
<a name="line-372"></a> <span class='varid'>getQName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getName</span><span class='layout'>)</span>
<a name="line-373"></a>
<a name="line-374"></a> <span class='comment'>-- | select the prefix:localPart or localPart from an element, attribute or pi</span>
<a name="line-375"></a> <span class='varid'>getName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-376"></a> <span class='varid'>getName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getQualifiedName</span><span class='layout'>)</span>
<a name="line-377"></a>
<a name="line-378"></a> <span class='comment'>-- | select the univeral name ({namespace URI} ++ localPart)</span>
<a name="line-379"></a> <span class='varid'>getUniversalName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-380"></a> <span class='varid'>getUniversalName</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getUniversalName</span><span class='layout'>)</span>
<a name="line-381"></a>
<a name="line-382"></a> <span class='comment'>-- | select the univeral name (namespace URI ++ localPart)</span>
<a name="line-383"></a> <span class='varid'>getUniversalUri</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-384"></a> <span class='varid'>getUniversalUri</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getUniversalUri</span><span class='layout'>)</span>
<a name="line-385"></a>
<a name="line-386"></a> <span class='comment'>-- | select the local part</span>
<a name="line-387"></a> <span class='varid'>getLocalPart</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-388"></a> <span class='varid'>getLocalPart</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getLocalPart</span><span class='layout'>)</span>
<a name="line-389"></a>
<a name="line-390"></a> <span class='comment'>-- | select the name prefix</span>
<a name="line-391"></a> <span class='varid'>getNamePrefix</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-392"></a> <span class='varid'>getNamePrefix</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getNamePrefix</span><span class='layout'>)</span>
<a name="line-393"></a>
<a name="line-394"></a> <span class='comment'>-- | select the namespace URI</span>
<a name="line-395"></a> <span class='varid'>getNamespaceUri</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-396"></a> <span class='varid'>getNamespaceUri</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getNamespaceUri</span><span class='layout'>)</span>
<a name="line-397"></a>
<a name="line-398"></a> <span class='comment'>-- | select the value of an attribute of an element node,</span>
<a name="line-399"></a> <span class='comment'>-- always succeeds with empty string as default value \"\"</span>
<a name="line-400"></a> <span class='varid'>getAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-401"></a> <span class='varid'>getAttrValue</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>xshow</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>getChildren</span><span class='layout'>)</span>
<a name="line-402"></a>
<a name="line-403"></a> <span class='comment'>-- | like 'getAttrValue', but fails if the attribute does not exist</span>
<a name="line-404"></a> <span class='varid'>getAttrValue0</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-405"></a> <span class='varid'>getAttrValue0</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>xshow</span> <span class='varid'>getChildren</span>
<a name="line-406"></a>
<a name="line-407"></a> <span class='comment'>-- | like 'getAttrValue', but select the value of an attribute given by a qualified name,</span>
<a name="line-408"></a> <span class='comment'>-- always succeeds with empty string as default value \"\"</span>
<a name="line-409"></a> <span class='varid'>getQAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-410"></a> <span class='varid'>getQAttrValue</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>xshow</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasQName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>getChildren</span><span class='layout'>)</span>
<a name="line-411"></a>
<a name="line-412"></a> <span class='comment'>-- | like 'getQAttrValue', but fails if attribute does not exist</span>
<a name="line-413"></a> <span class='varid'>getQAttrValue0</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-414"></a> <span class='varid'>getQAttrValue0</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>hasQName</span> <span class='varid'>n</span> <span class='varop'>>>></span> <span class='varid'>xshow</span> <span class='varid'>getChildren</span>
<a name="line-415"></a>
<a name="line-416"></a> <span class='comment'>-- edit arrows --------------------------------------------------</span>
<a name="line-417"></a>
<a name="line-418"></a> <span class='comment'>-- | edit the string of a text node</span>
<a name="line-419"></a> <span class='varid'>changeText</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-420"></a> <span class='varid'>changeText</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeText</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isText</span>
<a name="line-421"></a>
<a name="line-422"></a> <span class='comment'>-- | edit the comment string of a comment node</span>
<a name="line-423"></a> <span class='varid'>changeCmt</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-424"></a> <span class='varid'>changeCmt</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeCmt</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isCmt</span>
<a name="line-425"></a>
<a name="line-426"></a> <span class='comment'>-- | edit an element-, attribute- or pi- name</span>
<a name="line-427"></a> <span class='varid'>changeQName</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-428"></a> <span class='varid'>changeQName</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeName</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>getQName</span>
<a name="line-429"></a>
<a name="line-430"></a> <span class='comment'>-- | edit an element name</span>
<a name="line-431"></a> <span class='varid'>changeElemName</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-432"></a> <span class='varid'>changeElemName</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeElemName</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isElem</span>
<a name="line-433"></a>
<a name="line-434"></a> <span class='comment'>-- | edit an attribute name</span>
<a name="line-435"></a> <span class='varid'>changeAttrName</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-436"></a> <span class='varid'>changeAttrName</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeAttrName</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isAttr</span>
<a name="line-437"></a>
<a name="line-438"></a> <span class='comment'>-- | edit a pi name</span>
<a name="line-439"></a> <span class='varid'>changePiName</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-440"></a> <span class='varid'>changePiName</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changePiName</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isPi</span>
<a name="line-441"></a>
<a name="line-442"></a> <span class='comment'>-- | edit an attribute value</span>
<a name="line-443"></a> <span class='varid'>changeAttrValue</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-444"></a> <span class='varid'>changeAttrValue</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>replaceChildren</span> <span class='layout'>(</span> <span class='varid'>xshow</span> <span class='varid'>getChildren</span>
<a name="line-445"></a> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='varid'>cf</span>
<a name="line-446"></a> <span class='varop'>>>></span> <span class='varid'>mkText</span>
<a name="line-447"></a> <span class='layout'>)</span>
<a name="line-448"></a> <span class='varop'>`when`</span> <span class='varid'>isAttr</span>
<a name="line-449"></a>
<a name="line-450"></a>
<a name="line-451"></a> <span class='comment'>-- | edit an attribute list of an element node</span>
<a name="line-452"></a> <span class='varid'>changeAttrl</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-453"></a> <span class='varid'>changeAttrl</span> <span class='varid'>cf</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>listA</span> <span class='varid'>f</span> <span class='varop'>&&&</span> <span class='varid'>this</span> <span class='layout'>)</span>
<a name="line-454"></a> <span class='varop'>>>></span>
<a name="line-455"></a> <span class='varid'>arr2</span> <span class='varid'>changeAL</span>
<a name="line-456"></a> <span class='layout'>)</span>
<a name="line-457"></a> <span class='varop'>`when`</span>
<a name="line-458"></a> <span class='layout'>(</span> <span class='varid'>isElem</span> <span class='varop'><+></span> <span class='varid'>isPi</span> <span class='layout'>)</span>
<a name="line-459"></a> <span class='keyword'>where</span>
<a name="line-460"></a> <span class='varid'>changeAL</span> <span class='keyword'>as</span> <span class='varid'>x</span> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeAttrl</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>xs</span> <span class='keyglyph'>-></span> <span class='varid'>cf</span> <span class='varid'>xs</span> <span class='keyword'>as</span><span class='layout'>)</span> <span class='varid'>x</span>
<a name="line-461"></a>
<a name="line-462"></a> <span class='comment'>-- | replace an element, attribute or pi name</span>
<a name="line-463"></a> <span class='varid'>setQName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-464"></a> <span class='varid'>setQName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>changeQName</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-465"></a>
<a name="line-466"></a> <span class='comment'>-- | replace an element name</span>
<a name="line-467"></a> <span class='varid'>setElemName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-468"></a> <span class='varid'>setElemName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>changeElemName</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-469"></a>
<a name="line-470"></a> <span class='comment'>-- | replace an attribute name</span>
<a name="line-471"></a> <span class='varid'>setAttrName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-472"></a> <span class='varid'>setAttrName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>changeAttrName</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-473"></a>
<a name="line-474"></a> <span class='comment'>-- | replace an element name</span>
<a name="line-475"></a> <span class='varid'>setPiName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-476"></a> <span class='varid'>setPiName</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>changePiName</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-477"></a>
<a name="line-478"></a> <span class='comment'>-- | replace an atribute list of an element node</span>
<a name="line-479"></a> <span class='varid'>setAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-480"></a> <span class='varid'>setAttrl</span> <span class='keyglyph'>=</span> <span class='varid'>changeAttrl</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>id</span><span class='layout'>)</span> <span class='comment'>-- (\ x y -> y)</span>
<a name="line-481"></a>
<a name="line-482"></a> <span class='comment'>-- | add a list of attributes list to an element</span>
<a name="line-483"></a> <span class='varid'>addAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-484"></a> <span class='varid'>addAttrl</span> <span class='keyglyph'>=</span> <span class='varid'>changeAttrl</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mergeAttrl</span><span class='layout'>)</span>
<a name="line-485"></a>
<a name="line-486"></a> <span class='comment'>-- | add (or replace) an attribute</span>
<a name="line-487"></a> <span class='varid'>addAttr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-488"></a> <span class='varid'>addAttr</span> <span class='varid'>an</span> <span class='varid'>av</span> <span class='keyglyph'>=</span> <span class='varid'>addAttrl</span> <span class='layout'>(</span><span class='varid'>sattr</span> <span class='varid'>an</span> <span class='varid'>av</span><span class='layout'>)</span>
<a name="line-489"></a>
<a name="line-490"></a> <span class='comment'>-- | remove an attribute</span>
<a name="line-491"></a> <span class='varid'>removeAttr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-492"></a> <span class='varid'>removeAttr</span> <span class='varid'>an</span> <span class='keyglyph'>=</span> <span class='varid'>processAttrl</span> <span class='layout'>(</span><span class='varid'>none</span> <span class='varop'>`when`</span> <span class='varid'>hasName</span> <span class='varid'>an</span><span class='layout'>)</span>
<a name="line-493"></a>
<a name="line-494"></a> <span class='comment'>-- | remove an attribute with a qualified name</span>
<a name="line-495"></a> <span class='varid'>removeQAttr</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-496"></a> <span class='varid'>removeQAttr</span> <span class='varid'>an</span> <span class='keyglyph'>=</span> <span class='varid'>processAttrl</span> <span class='layout'>(</span><span class='varid'>none</span> <span class='varop'>`when`</span> <span class='varid'>hasQName</span> <span class='varid'>an</span><span class='layout'>)</span>
<a name="line-497"></a>
<a name="line-498"></a> <span class='comment'>-- | process the attributes of an element node with an arrow</span>
<a name="line-499"></a> <span class='varid'>processAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-500"></a> <span class='varid'>processAttrl</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='varid'>setAttrl</span> <span class='layout'>(</span><span class='varid'>getAttrl</span> <span class='varop'>>>></span> <span class='varid'>f</span><span class='layout'>)</span>
<a name="line-501"></a>
<a name="line-502"></a> <span class='comment'>-- | process a whole tree inclusive attribute list of element nodes</span>
<a name="line-503"></a> <span class='comment'>-- see also: 'Control.Arrow.ArrowTree.processTopDown'</span>
<a name="line-504"></a>
<a name="line-505"></a> <span class='varid'>processTopDownWithAttrl</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-506"></a> <span class='varid'>processTopDownWithAttrl</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='varid'>processTopDown</span> <span class='layout'>(</span> <span class='varid'>f</span> <span class='varop'>>>></span> <span class='layout'>(</span> <span class='varid'>processAttrl</span> <span class='layout'>(</span><span class='varid'>processTopDown</span> <span class='varid'>f</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isElem</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-507"></a>
<a name="line-508"></a> <span class='comment'>-- | convenient op for adding attributes or children to a node</span>
<a name="line-509"></a> <span class='comment'>--</span>
<a name="line-510"></a> <span class='comment'>-- usage: @ tf += cf @</span>
<a name="line-511"></a> <span class='comment'>--</span>
<a name="line-512"></a> <span class='comment'>-- the @tf@ arrow computes an element node, and all trees computed by @cf@ are</span>
<a name="line-513"></a> <span class='comment'>-- added to this node, if a tree is an attribute, it is inserted in the attribute list</span>
<a name="line-514"></a> <span class='comment'>-- else it is appended to the content list.</span>
<a name="line-515"></a> <span class='comment'>--</span>
<a name="line-516"></a> <span class='comment'>-- attention: do not build long content list this way because '+=' is implemented by ++</span>
<a name="line-517"></a> <span class='comment'>--</span>
<a name="line-518"></a> <span class='comment'>-- examples:</span>
<a name="line-519"></a> <span class='comment'>--</span>
<a name="line-520"></a> <span class='comment'>-- > eelem "a"</span>
<a name="line-521"></a> <span class='comment'>-- > += sattr "href" "page.html"</span>
<a name="line-522"></a> <span class='comment'>-- > += sattr "name" "here"</span>
<a name="line-523"></a> <span class='comment'>-- > += txt "look here"</span>
<a name="line-524"></a> <span class='comment'>--</span>
<a name="line-525"></a> <span class='comment'>-- is the same as</span>
<a name="line-526"></a> <span class='comment'>--</span>
<a name="line-527"></a> <span class='comment'>-- > mkelem [ sattr "href" "page.html"</span>
<a name="line-528"></a> <span class='comment'>-- > , sattr "name" "here"</span>
<a name="line-529"></a> <span class='comment'>-- > ]</span>
<a name="line-530"></a> <span class='comment'>-- > [ txt "look here" ]</span>
<a name="line-531"></a> <span class='comment'>--</span>
<a name="line-532"></a> <span class='comment'>-- and results in the XML fragment: \<a href=\"page.html\" name=\"here\"\>look here\<\/a\></span>
<a name="line-533"></a> <span class='comment'>--</span>
<a name="line-534"></a> <span class='comment'>-- advantage of the '+=' operator is, that attributes and content can be added</span>
<a name="line-535"></a> <span class='comment'>-- any time step by step.</span>
<a name="line-536"></a> <span class='comment'>-- if @tf@ computes a whole list of trees, e.g. a list of \"td\" or \"tr\" elements,</span>
<a name="line-537"></a> <span class='comment'>-- the attributes or content is added to all trees. useful for adding \"class\" or \"style\" attributes</span>
<a name="line-538"></a> <span class='comment'>-- to table elements.</span>
<a name="line-539"></a>
<a name="line-540"></a> <span class='layout'>(</span><span class='varop'>+=</span><span class='layout'>)</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='varid'>b</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>b</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>b</span> <span class='conid'>XmlTree</span>
<a name="line-541"></a> <span class='varid'>tf</span> <span class='varop'>+=</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>tf</span> <span class='varop'>&&&</span> <span class='varid'>listA</span> <span class='varid'>cf</span><span class='layout'>)</span> <span class='varop'>>>></span> <span class='varid'>arr2</span> <span class='varid'>addChildren</span>
<a name="line-542"></a> <span class='keyword'>where</span>
<a name="line-543"></a> <span class='varid'>addChildren</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span>
<a name="line-544"></a> <span class='varid'>addChildren</span> <span class='varid'>t</span> <span class='varid'>cs</span>
<a name="line-545"></a> <span class='keyglyph'>=</span> <span class='varid'>foldl</span> <span class='varid'>addChild</span> <span class='varid'>t</span> <span class='varid'>cs</span>
<a name="line-546"></a> <span class='varid'>addChild</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span>
<a name="line-547"></a> <span class='varid'>addChild</span> <span class='varid'>t</span> <span class='varid'>c</span>
<a name="line-548"></a> <span class='keyglyph'>|</span> <span class='varid'>not</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isElem</span> <span class='varid'>t</span><span class='layout'>)</span>
<a name="line-549"></a> <span class='keyglyph'>=</span> <span class='varid'>t</span>
<a name="line-550"></a> <span class='keyglyph'>|</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>isAttr</span> <span class='varid'>c</span>
<a name="line-551"></a> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeAttrl</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>addAttr</span> <span class='varid'>c</span><span class='layout'>)</span> <span class='varid'>t</span>
<a name="line-552"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-553"></a> <span class='keyglyph'>=</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeChildren</span> <span class='layout'>(</span><span class='varop'>++</span> <span class='keyglyph'>[</span><span class='varid'>c</span><span class='keyglyph'>]</span><span class='layout'>)</span> <span class='varid'>t</span>
<a name="line-554"></a>
<a name="line-555"></a> <span class='comment'>-- | apply an arrow to the input and convert the resulting XML trees into a string representation</span>
<a name="line-556"></a> <span class='varid'>xshow</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>String</span>
<a name="line-557"></a> <span class='varid'>xshow</span> <span class='varid'>f</span> <span class='keyglyph'>=</span> <span class='varid'>f</span> <span class='varop'>>.</span> <span class='conid'>XS</span><span class='varop'>.</span><span class='varid'>xshow</span>
<a name="line-558"></a>
<a name="line-559"></a><span class='comment'>{- | Document Type Definition arrows
<a name="line-560"></a>
<a name="line-561"></a>These are separated, because they are not needed for document processing,
<a name="line-562"></a>only when processing the DTD, e.g. for generating access funtions for the toolbox
<a name="line-563"></a>from a DTD (se example DTDtoHaskell in the examples directory)
<a name="line-564"></a>-}</span>
<a name="line-565"></a>
<a name="line-566"></a>
<a name="line-567"></a><a name="ArrowDTD"></a><span class='keyword'>class</span> <span class='layout'>(</span><span class='conid'>ArrowXml</span> <span class='varid'>a</span><span class='layout'>)</span> <span class='keyglyph'>=></span> <span class='conid'>ArrowDTD</span> <span class='varid'>a</span> <span class='keyword'>where</span>
<a name="line-568"></a> <span class='varid'>isDTDDoctype</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-569"></a> <span class='varid'>isDTDDoctype</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>DOCTYPE</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-570"></a>
<a name="line-571"></a> <span class='varid'>isDTDElement</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-572"></a> <span class='varid'>isDTDElement</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>ELEMENT</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-573"></a>
<a name="line-574"></a> <span class='varid'>isDTDContent</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-575"></a> <span class='varid'>isDTDContent</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>CONTENT</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-576"></a>
<a name="line-577"></a> <span class='varid'>isDTDAttlist</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-578"></a> <span class='varid'>isDTDAttlist</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>ATTLIST</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-579"></a>
<a name="line-580"></a> <span class='varid'>isDTDEntity</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-581"></a> <span class='varid'>isDTDEntity</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>ENTITY</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-582"></a>
<a name="line-583"></a> <span class='varid'>isDTDPEntity</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-584"></a> <span class='varid'>isDTDPEntity</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>PENTITY</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-585"></a>
<a name="line-586"></a> <span class='varid'>isDTDNotation</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-587"></a> <span class='varid'>isDTDNotation</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>NOTATION</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-588"></a>
<a name="line-589"></a> <span class='varid'>isDTDCondSect</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-590"></a> <span class='varid'>isDTDCondSect</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>CONDSECT</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-591"></a>
<a name="line-592"></a> <span class='varid'>isDTDName</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-593"></a> <span class='varid'>isDTDName</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>NAME</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-594"></a>
<a name="line-595"></a> <span class='varid'>isDTDPERef</span> <span class='keyglyph'>::</span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-596"></a> <span class='varid'>isDTDPERef</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>maybe</span> <span class='conid'>False</span> <span class='layout'>(</span><span class='varop'>==</span> <span class='conid'>PEREF</span> <span class='layout'>)</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDPart</span><span class='layout'>)</span>
<a name="line-597"></a>
<a name="line-598"></a> <span class='varid'>hasDTDAttr</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-599"></a> <span class='varid'>hasDTDAttr</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>isJust</span> <span class='varop'>.</span> <span class='varid'>lookup</span> <span class='varid'>n</span> <span class='varop'>.</span> <span class='varid'>fromMaybe</span> <span class='conid'>[]</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDAttrl</span><span class='layout'>)</span>
<a name="line-600"></a>
<a name="line-601"></a> <span class='varid'>getDTDAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-602"></a> <span class='varid'>getDTDAttrValue</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='varid'>arrL</span> <span class='layout'>(</span><span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='varid'>lookup</span> <span class='varid'>n</span> <span class='varop'>.</span> <span class='varid'>fromMaybe</span> <span class='conid'>[]</span> <span class='varop'>.</span> <span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>getDTDAttrl</span><span class='layout'>)</span>
<a name="line-603"></a>
<a name="line-604"></a> <span class='varid'>setDTDAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-605"></a> <span class='varid'>setDTDAttrValue</span> <span class='varid'>n</span> <span class='varid'>v</span> <span class='keyglyph'>=</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>changeDTDAttrl</span> <span class='layout'>(</span><span class='varid'>addEntry</span> <span class='varid'>n</span> <span class='varid'>v</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>`when`</span> <span class='varid'>isDTD</span>
<a name="line-606"></a>
<a name="line-607"></a> <span class='varid'>mkDTDElem</span> <span class='keyglyph'>::</span> <span class='conid'>DTDElem</span> <span class='keyglyph'>-></span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-608"></a> <span class='varid'>mkDTDElem</span> <span class='varid'>e</span> <span class='varid'>al</span> <span class='varid'>cf</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varid'>cf</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='conid'>XN</span><span class='varop'>.</span><span class='varid'>mkDTDElem</span> <span class='varid'>e</span> <span class='varid'>al</span><span class='layout'>)</span>
<a name="line-609"></a>
<a name="line-610"></a> <span class='varid'>mkDTDDoctype</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-611"></a> <span class='varid'>mkDTDDoctype</span> <span class='keyglyph'>=</span> <span class='varid'>mkDTDElem</span> <span class='conid'>DOCTYPE</span>
<a name="line-612"></a>
<a name="line-613"></a> <span class='varid'>mkDTDElement</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-614"></a> <span class='varid'>mkDTDElement</span> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>mkDTDElem</span> <span class='conid'>ELEMENT</span> <span class='varid'>al</span> <span class='varid'>none</span>
<a name="line-615"></a>
<a name="line-616"></a> <span class='varid'>mkDTDEntity</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-617"></a> <span class='varid'>mkDTDEntity</span> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>mkDTDElem</span> <span class='conid'>ENTITY</span> <span class='varid'>al</span> <span class='varid'>none</span>
<a name="line-618"></a>
<a name="line-619"></a> <span class='varid'>mkDTDPEntity</span> <span class='keyglyph'>::</span> <span class='conid'>Attributes</span> <span class='keyglyph'>-></span> <span class='varid'>a</span> <span class='varid'>n</span> <span class='conid'>XmlTree</span>
<a name="line-620"></a> <span class='varid'>mkDTDPEntity</span> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>mkDTDElem</span> <span class='conid'>PENTITY</span> <span class='varid'>al</span> <span class='varid'>none</span>
<a name="line-621"></a>
<a name="line-622"></a><span class='keyword'>instance</span> <span class='conid'>ArrowXml</span> <span class='conid'>LA</span>
<a name="line-623"></a><span class='keyword'>instance</span> <span class='conid'>ArrowXml</span> <span class='layout'>(</span><span class='conid'>SLA</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-624"></a><span class='keyword'>instance</span> <span class='conid'>ArrowXml</span> <span class='conid'>IOLA</span>
<a name="line-625"></a><span class='keyword'>instance</span> <span class='conid'>ArrowXml</span> <span class='layout'>(</span><span class='conid'>IOSLA</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-626"></a>
<a name="line-627"></a><span class='keyword'>instance</span> <span class='conid'>ArrowDTD</span> <span class='conid'>LA</span>
<a name="line-628"></a><span class='keyword'>instance</span> <span class='conid'>ArrowDTD</span> <span class='layout'>(</span><span class='conid'>SLA</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-629"></a><span class='keyword'>instance</span> <span class='conid'>ArrowDTD</span> <span class='conid'>IOLA</span>
<a name="line-630"></a><span class='keyword'>instance</span> <span class='conid'>ArrowDTD</span> <span class='layout'>(</span><span class='conid'>IOSLA</span> <span class='varid'>s</span><span class='layout'>)</span>
<a name="line-631"></a>
<a name="line-632"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
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