hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-XPath-NavTree.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- Navigable tree structure which allow a program to traverse</span>
<a name="line-3"></a><span class='comment'>-- for XPath expressions</span>
<a name="line-4"></a><span class='comment'>-- copied and modified from HXML (<<a href="http://www.flightlab.com/~joe/hxml/">http://www.flightlab.com/~joe/hxml/</a>>)</span>
<a name="line-5"></a><span class='comment'>--</span>
<a name="line-6"></a>
<a name="line-7"></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'>XPath</span><span class='varop'>.</span><span class='conid'>NavTree</span>
<a name="line-8"></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'>XPath</span><span class='varop'>.</span><span class='conid'>NavTree</span>
<a name="line-9"></a> <span class='layout'>,</span> <span class='keyword'>module</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>NavTree</span>
<a name="line-10"></a> <span class='layout'>)</span>
<a name="line-11"></a><span class='keyword'>where</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>NavTree</span>
<a name="line-16"></a>
<a name="line-17"></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-18"></a> <span class='layout'>(</span> <span class='conid'>XNode</span>
<a name="line-19"></a> <span class='layout'>,</span> <span class='varid'>xmlnsNamespace</span>
<a name="line-20"></a> <span class='layout'>,</span> <span class='varid'>namespaceUri</span>
<a name="line-21"></a> <span class='layout'>)</span>
<a name="line-22"></a>
<a name="line-23"></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'>XmlNode</span>
<a name="line-24"></a> <span class='layout'>(</span> <span class='varid'>isRoot</span>
<a name="line-25"></a> <span class='layout'>,</span> <span class='varid'>isElem</span>
<a name="line-26"></a> <span class='layout'>,</span> <span class='varid'>getName</span>
<a name="line-27"></a> <span class='layout'>,</span> <span class='varid'>getAttrl</span>
<a name="line-28"></a> <span class='layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-31"></a><span class='comment'>-- functions for representing XPath axes. All axes except the namespace-axis are supported</span>
<a name="line-32"></a>
<a name="line-33"></a>
<a name="line-34"></a><a name="parentAxis"></a><span class='definition'>parentAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-35"></a><span class='definition'>parentAxis</span> <span class='keyglyph'>=</span> <span class='varid'>maybeToList</span> <span class='varop'>.</span> <span class='varid'>upNT</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="ancestorAxis"></a><span class='definition'>ancestorAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-38"></a><span class='definition'>ancestorAxis</span> <span class='keyglyph'>=</span> <span class='keyglyph'>\</span><span class='layout'>(</span><span class='conid'>NT</span> <span class='keyword'>_</span> <span class='varid'>u</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>u</span> <span class='comment'>-- or: maybePlus upNT</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="ancestorOrSelfAxis"></a><span class='definition'>ancestorOrSelfAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-41"></a><span class='definition'>ancestorOrSelfAxis</span> <span class='keyglyph'>=</span> <span class='keyglyph'>\</span><span class='varid'>t</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NT</span> <span class='keyword'>_</span> <span class='varid'>u</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>-></span> <span class='varid'>t</span><span class='conop'>:</span><span class='varid'>u</span> <span class='comment'>-- or: maybeStar upNT</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="childAxis"></a><span class='definition'>childAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-44"></a><span class='definition'>childAxis</span> <span class='keyglyph'>=</span> <span class='varid'>maybe</span> <span class='conid'>[]</span> <span class='layout'>(</span><span class='varid'>maybeStar</span> <span class='varid'>rightNT</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='varid'>downNT</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="descendantAxis"></a><span class='definition'>descendantAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-47"></a><span class='definition'>descendantAxis</span> <span class='keyglyph'>=</span> <span class='varid'>tail</span> <span class='varop'>.</span> <span class='varid'>preorderNT</span> <span class='comment'>-- concatMap preorderNT . childAxis</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="descendantOrSelfAxis"></a><span class='definition'>descendantOrSelfAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-50"></a><span class='definition'>descendantOrSelfAxis</span> <span class='keyglyph'>=</span> <span class='varid'>preorderNT</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="followingSiblingAxis"></a><span class='definition'>followingSiblingAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-53"></a><span class='definition'>followingSiblingAxis</span> <span class='keyglyph'>=</span> <span class='varid'>maybePlus</span> <span class='varid'>rightNT</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="precedingSiblingAxis"></a><span class='definition'>precedingSiblingAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-56"></a><span class='definition'>precedingSiblingAxis</span> <span class='keyglyph'>=</span> <span class='varid'>maybePlus</span> <span class='varid'>leftNT</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="selfAxis"></a><span class='definition'>selfAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-59"></a><span class='definition'>selfAxis</span> <span class='keyglyph'>=</span> <span class='varid'>wrap</span> <span class='keyword'>where</span> <span class='varid'>wrap</span> <span class='varid'>x</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='varid'>x</span><span class='keyglyph'>]</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="followingAxis"></a><span class='definition'>followingAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-62"></a><span class='definition'>followingAxis</span> <span class='keyglyph'>=</span> <span class='varid'>preorderNT</span> <span class='varop'>`o'`</span> <span class='varid'>followingSiblingAxis</span> <span class='varop'>`o'`</span> <span class='varid'>ancestorOrSelfAxis</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="precedingAxis"></a><span class='definition'>precedingAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='varid'>a</span><span class='keyglyph'>]</span>
<a name="line-65"></a><span class='definition'>precedingAxis</span> <span class='keyglyph'>=</span> <span class='varid'>revPreorderNT</span> <span class='varop'>`o'`</span> <span class='varid'>precedingSiblingAxis</span> <span class='varop'>`o'`</span> <span class='varid'>ancestorOrSelfAxis</span>
<a name="line-66"></a>
<a name="line-67"></a>
<a name="line-68"></a><a name="attributeAxis"></a><span class='definition'>attributeAxis</span> <span class='keyglyph'>::</span> <span class='conid'>NavTree</span> <span class='conid'>XNode</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>NavTree</span> <span class='conid'>XNode</span><span class='keyglyph'>]</span>
<a name="line-69"></a><span class='definition'>attributeAxis</span> <span class='varid'>t</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NT</span> <span class='varid'>xt</span> <span class='varid'>a</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span>
<a name="line-70"></a> <span class='keyglyph'>|</span> <span class='varid'>isElem</span> <span class='varid'>xt</span>
<a name="line-71"></a> <span class='varop'>&&</span>
<a name="line-72"></a> <span class='varid'>not</span> <span class='layout'>(</span><span class='varid'>isRoot</span> <span class='varid'>xt</span><span class='layout'>)</span>
<a name="line-73"></a> <span class='keyglyph'>=</span> <span class='varid'>foldr</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>attr</span> <span class='keyglyph'>-></span> <span class='layout'>(</span><span class='layout'>(</span><span class='conid'>NT</span> <span class='varid'>attr</span> <span class='layout'>(</span><span class='varid'>t</span><span class='conop'>:</span><span class='varid'>a</span><span class='layout'>)</span> <span class='conid'>[]</span> <span class='conid'>[]</span><span class='layout'>)</span><span class='conop'>:</span><span class='layout'>)</span><span class='layout'>)</span> <span class='conid'>[]</span> <span class='varid'>al</span>
<a name="line-74"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-75"></a> <span class='keyglyph'>=</span> <span class='conid'>[]</span>
<a name="line-76"></a> <span class='keyword'>where</span>
<a name="line-77"></a> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>filter</span> <span class='layout'>(</span><span class='layout'>(</span><span class='varop'>/=</span> <span class='varid'>xmlnsNamespace</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='varid'>maybe</span> <span class='str'>""</span> <span class='varid'>namespaceUri</span> <span class='varop'>.</span> <span class='varid'>getName</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='varid'>fromMaybe</span> <span class='conid'>[]</span> <span class='varop'>.</span> <span class='varid'>getAttrl</span> <span class='varop'>$</span> <span class='varid'>xt</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
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