hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-XPath-XPathToNodeSet.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- Convert an XPath result set into a node set</span>
<a name="line-3"></a><span class='comment'>--</span>
<a name="line-4"></a>
<a name="line-5"></a>
<a name="line-6"></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'>XPathToNodeSet</span>
<a name="line-7"></a> <span class='layout'>(</span> <span class='varid'>xPValue2NodeSet</span>
<a name="line-8"></a> <span class='layout'>,</span> <span class='varid'>emptyNodeSet</span>
<a name="line-9"></a> <span class='layout'>)</span>
<a name="line-10"></a><span class='keyword'>where</span>
<a name="line-11"></a>
<a name="line-12"></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'>TypeDefs</span>
<a name="line-13"></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'>XPath</span><span class='varop'>.</span><span class='conid'>XPathDataTypes</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'>Maybe</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-18"></a><span class='comment'>-- |</span>
<a name="line-19"></a><span class='comment'>-- Convert a a XPath-value into a XmlNodeSet represented by a tree structure</span>
<a name="line-20"></a><span class='comment'>--</span>
<a name="line-21"></a><span class='comment'>-- The XmlNodeSet can be used to traverse a tree an process all</span>
<a name="line-22"></a><span class='comment'>-- marked nodes.</span>
<a name="line-23"></a>
<a name="line-24"></a><a name="xPValue2NodeSet"></a><span class='definition'>xPValue2NodeSet</span> <span class='keyglyph'>::</span> <span class='conid'>XPathValue</span> <span class='keyglyph'>-></span> <span class='conid'>XmlNodeSet</span>
<a name="line-25"></a><span class='definition'>xPValue2NodeSet</span> <span class='layout'>(</span><span class='conid'>XPVNode</span> <span class='varid'>ns</span><span class='layout'>)</span>
<a name="line-26"></a> <span class='keyglyph'>=</span> <span class='varid'>toNodeSet</span> <span class='varid'>ns</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='definition'>xPValue2NodeSet</span> <span class='keyword'>_</span>
<a name="line-29"></a> <span class='keyglyph'>=</span> <span class='varid'>emptyNodeSet</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="emptyNodeSet"></a><span class='definition'>emptyNodeSet</span> <span class='keyglyph'>::</span> <span class='conid'>XmlNodeSet</span>
<a name="line-32"></a><span class='definition'>emptyNodeSet</span> <span class='keyglyph'>=</span> <span class='conid'>XNS</span> <span class='conid'>False</span> <span class='conid'>[]</span> <span class='conid'>[]</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="leafNodeSet"></a><span class='definition'>leafNodeSet</span> <span class='keyglyph'>::</span> <span class='conid'>XmlNodeSet</span>
<a name="line-35"></a><span class='definition'>leafNodeSet</span> <span class='keyglyph'>=</span> <span class='conid'>XNS</span> <span class='conid'>True</span> <span class='conid'>[]</span> <span class='conid'>[]</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="toNodeSet"></a><span class='definition'>toNodeSet</span> <span class='keyglyph'>::</span> <span class='conid'>NodeSet</span> <span class='keyglyph'>-></span> <span class='conid'>XmlNodeSet</span>
<a name="line-38"></a><span class='definition'>toNodeSet</span>
<a name="line-39"></a> <span class='keyglyph'>=</span> <span class='varid'>pathListToNodeSet</span> <span class='varop'>.</span> <span class='varid'>map</span> <span class='varid'>toPath</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="toPath"></a><span class='definition'>toPath</span> <span class='keyglyph'>::</span> <span class='conid'>NavXmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlNodeSet</span>
<a name="line-42"></a><span class='definition'>toPath</span>
<a name="line-43"></a> <span class='keyglyph'>=</span> <span class='varid'>upTree</span> <span class='varid'>leafNodeSet</span>
<a name="line-44"></a>
<a name="line-45"></a>
<a name="line-46"></a><a name="upTree"></a><span class='definition'>upTree</span> <span class='keyglyph'>::</span> <span class='conid'>XmlNodeSet</span> <span class='keyglyph'>-></span> <span class='conid'>NavXmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlNodeSet</span>
<a name="line-47"></a><span class='definition'>upTree</span> <span class='varid'>ps</span> <span class='varid'>t</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NT</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='varid'>n</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='sel'>_par</span> <span class='varid'>left</span> <span class='sel'>_right</span><span class='layout'>)</span>
<a name="line-48"></a> <span class='keyglyph'>=</span> <span class='varid'>up</span> <span class='layout'>(</span><span class='varid'>upNT</span> <span class='varid'>t</span><span class='layout'>)</span>
<a name="line-49"></a> <span class='keyword'>where</span>
<a name="line-50"></a> <span class='varid'>up</span> <span class='layout'>(</span><span class='conid'>Just</span> <span class='varid'>pt</span><span class='layout'>)</span>
<a name="line-51"></a> <span class='keyglyph'>|</span> <span class='varid'>isJust</span> <span class='varop'>.</span> <span class='varid'>upNT</span> <span class='varop'>$</span> <span class='varid'>pt</span> <span class='comment'>-- pt is a "real" node</span>
<a name="line-52"></a> <span class='keyglyph'>=</span> <span class='varid'>upTree</span> <span class='layout'>(</span><span class='varid'>pix</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varid'>pt</span>
<a name="line-53"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='comment'>-- pt is the added root node, stop recursion</span>
<a name="line-54"></a> <span class='keyglyph'>=</span> <span class='varid'>ps</span>
<a name="line-55"></a> <span class='varid'>up</span> <span class='conid'>Nothing</span> <span class='comment'>-- never used recursion should stop earler</span>
<a name="line-56"></a> <span class='keyglyph'>=</span> <span class='varid'>ps</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='varid'>pix</span> <span class='layout'>(</span><span class='conid'>XAttr</span> <span class='varid'>qn</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>XNS</span> <span class='conid'>False</span> <span class='keyglyph'>[</span><span class='varid'>qn</span><span class='keyglyph'>]</span> <span class='conid'>[]</span>
<a name="line-59"></a> <span class='varid'>pix</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='conid'>XNS</span> <span class='conid'>False</span> <span class='conid'>[]</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='varid'>length</span> <span class='varid'>left</span><span class='layout'>,</span> <span class='varid'>ps</span><span class='layout'>)</span><span class='keyglyph'>]</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="pathListToNodeSet"></a><span class='definition'>pathListToNodeSet</span> <span class='keyglyph'>::</span><span class='keyglyph'>[</span><span class='conid'>XmlNodeSet</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='conid'>XmlNodeSet</span>
<a name="line-62"></a><span class='definition'>pathListToNodeSet</span>
<a name="line-63"></a> <span class='keyglyph'>=</span> <span class='varid'>foldr</span> <span class='varid'>mergePaths</span> <span class='varid'>emptyNodeSet</span>
<a name="line-64"></a> <span class='keyword'>where</span>
<a name="line-65"></a> <span class='varid'>mergePaths</span> <span class='layout'>(</span><span class='conid'>XNS</span> <span class='varid'>p1</span> <span class='varid'>al1</span> <span class='varid'>cl1</span><span class='layout'>)</span> <span class='layout'>(</span><span class='conid'>XNS</span> <span class='varid'>p2</span> <span class='varid'>al2</span> <span class='varid'>cl2</span><span class='layout'>)</span>
<a name="line-66"></a> <span class='keyglyph'>=</span> <span class='conid'>XNS</span> <span class='layout'>(</span><span class='varid'>p1</span> <span class='varop'>||</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>al1</span> <span class='varop'>++</span> <span class='varid'>al2</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>mergeSubPaths</span> <span class='varid'>cl1</span> <span class='varid'>cl2</span><span class='layout'>)</span>
<a name="line-67"></a>
<a name="line-68"></a> <span class='varid'>mergeSubPaths</span> <span class='conid'>[]</span> <span class='varid'>sp2</span> <span class='keyglyph'>=</span> <span class='varid'>sp2</span>
<a name="line-69"></a> <span class='varid'>mergeSubPaths</span> <span class='layout'>(</span><span class='varid'>s1</span><span class='conop'>:</span><span class='varid'>sp1</span><span class='layout'>)</span> <span class='varid'>sp2</span> <span class='keyglyph'>=</span> <span class='varid'>mergeSubPath</span> <span class='varid'>s1</span> <span class='layout'>(</span><span class='varid'>mergeSubPaths</span> <span class='varid'>sp1</span> <span class='varid'>sp2</span><span class='layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a> <span class='varid'>mergeSubPath</span> <span class='varid'>s1</span> <span class='conid'>[]</span>
<a name="line-72"></a> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='varid'>s1</span><span class='keyglyph'>]</span>
<a name="line-73"></a> <span class='varid'>mergeSubPath</span> <span class='varid'>s1</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='varid'>ix1</span><span class='layout'>,</span><span class='varid'>p1</span><span class='layout'>)</span> <span class='varid'>sl</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='varid'>s2</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='varid'>ix2</span><span class='layout'>,</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='conop'>:</span> <span class='varid'>sl'</span><span class='layout'>)</span>
<a name="line-74"></a> <span class='keyglyph'>|</span> <span class='varid'>ix1</span> <span class='varop'><</span> <span class='varid'>ix2</span> <span class='keyglyph'>=</span> <span class='varid'>s1</span> <span class='conop'>:</span> <span class='varid'>sl</span>
<a name="line-75"></a> <span class='keyglyph'>|</span> <span class='varid'>ix1</span> <span class='varop'>></span> <span class='varid'>ix2</span> <span class='keyglyph'>=</span> <span class='varid'>s2</span> <span class='conop'>:</span> <span class='varid'>mergeSubPath</span> <span class='varid'>s1</span> <span class='varid'>sl'</span> <span class='comment'>-- ordered insert of s1 </span>
<a name="line-76"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>ix1</span><span class='layout'>,</span> <span class='varid'>mergePaths</span> <span class='varid'>p1</span> <span class='varid'>p2</span><span class='layout'>)</span> <span class='conop'>:</span> <span class='varid'>sl'</span> <span class='comment'>-- same ix merge subpaths</span>
<a name="line-77"></a>
<a name="line-78"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
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