hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-DOM-NamespacePredicates.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- basic Namespace and QName predicates and functions</span>
<a name="line-3"></a><span class='comment'>--</span>
<a name="line-4"></a><span class='comment'>-- $Id: NamespacePredicates.hs,v 1.3 2006/11/12 14:53:00 hxml Exp $</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'>DOM</span><span class='varop'>.</span><span class='conid'>NamespacePredicates</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'>DOM</span><span class='varop'>.</span><span class='conid'>NamespacePredicates</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'>XmlTreeTypes</span> <span class='comment'>-- NTree and XNode types</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'>DOM</span><span class='varop'>.</span><span class='conid'>XmlKeywords</span> <span class='comment'>-- keywords for DTD</span>
<a name="line-14"></a>
<a name="line-15"></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-16"></a> <span class='layout'>(</span> <span class='varid'>isXmlNCNameStartChar</span>
<a name="line-17"></a> <span class='layout'>,</span> <span class='varid'>isXmlNCNameChar</span>
<a name="line-18"></a> <span class='layout'>)</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-21"></a><span class='comment'>--</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='comment'>-- |</span>
<a name="line-24"></a><span class='comment'>-- Compute the name prefix and the namespace uri for a qualified name.</span>
<a name="line-25"></a><span class='comment'>--</span>
<a name="line-26"></a><span class='comment'>-- This function does not test whether the name is a wellformed qualified name.</span>
<a name="line-27"></a><span class='comment'>-- see Namespaces in XML Rule [6] to [8]. Error checking is done with separate functions,</span>
<a name="line-28"></a><span class='comment'>-- see 'isWellformedQName' and 'isWellformedQualifiedName' for error checking.</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="setNamespace"></a><span class='definition'>setNamespace</span> <span class='keyglyph'>::</span> <span class='conid'>NsEnv</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>QName</span>
<a name="line-31"></a><span class='definition'>setNamespace</span> <span class='varid'>nst</span> <span class='varid'>n</span>
<a name="line-32"></a> <span class='keyglyph'>=</span> <span class='varid'>uncurry</span> <span class='varid'>ns</span> <span class='varop'>.</span> <span class='varid'>span</span> <span class='layout'>(</span><span class='varop'>/=</span> <span class='chr'>':'</span><span class='layout'>)</span> <span class='varop'>$</span> <span class='varid'>qn</span>
<a name="line-33"></a> <span class='keyword'>where</span>
<a name="line-34"></a> <span class='varid'>qn</span> <span class='keyglyph'>=</span> <span class='varid'>qualifiedName</span> <span class='varid'>n</span> <span class='comment'>-- using qualifiedName instead of localPart enables recomputing of setNamespace</span>
<a name="line-35"></a>
<a name="line-36"></a> <span class='varid'>ns</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='conid'>QName</span>
<a name="line-37"></a> <span class='varid'>ns</span> <span class='varid'>lp</span> <span class='str'>""</span> <span class='comment'>-- no ":" found in name, use default namespace uri</span>
<a name="line-38"></a> <span class='keyglyph'>=</span> <span class='varid'>mkQName</span> <span class='str'>""</span> <span class='varid'>lp</span> <span class='layout'>(</span><span class='varid'>lookup1</span> <span class='str'>""</span> <span class='varid'>nst</span><span class='layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a> <span class='varid'>ns</span> <span class='varid'>px</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='keyword'>_</span><span class='conop'>:</span><span class='keyword'>_</span><span class='layout'>)</span> <span class='layout'>(</span><span class='chr'>':'</span> <span class='conop'>:</span> <span class='varid'>lp</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='keyword'>_</span><span class='conop'>:</span><span class='keyword'>_</span><span class='layout'>)</span><span class='layout'>)</span> <span class='comment'>-- non empty prefix and non empty local part found</span>
<a name="line-41"></a> <span class='keyglyph'>=</span> <span class='varid'>mkQName</span> <span class='varid'>px</span> <span class='varid'>lp</span> <span class='layout'>(</span><span class='varid'>lookup1</span> <span class='varid'>px</span> <span class='varid'>nst</span><span class='layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a> <span class='varid'>ns</span> <span class='keyword'>_</span> <span class='keyword'>_</span> <span class='comment'>-- not a legal qualified name, don't change name</span>
<a name="line-44"></a> <span class='keyglyph'>=</span> <span class='varid'>n</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="xmlnsQN"></a><span class='definition'>xmlnsQN</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span>
<a name="line-47"></a><span class='definition'>xmlnsQN</span> <span class='keyglyph'>=</span> <span class='varid'>mkQName</span> <span class='str'>""</span> <span class='varid'>a_xmlns</span> <span class='varid'>xmlnsNamespace</span>
<a name="line-48"></a>
<a name="line-49"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-50"></a><span class='comment'>--</span>
<a name="line-51"></a>
<a name="line-52"></a><span class='comment'>-- |</span>
<a name="line-53"></a><span class='comment'>-- test for wellformed NCName, rule [4] XML Namespaces</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="isNCName"></a><span class='definition'>isNCName</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-56"></a><span class='definition'>isNCName</span> <span class='conid'>[]</span>
<a name="line-57"></a> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-58"></a><span class='definition'>isNCName</span> <span class='varid'>n</span>
<a name="line-59"></a> <span class='keyglyph'>=</span> <span class='varid'>and</span> <span class='layout'>(</span> <span class='varid'>zipWith</span> <span class='layout'>(</span><span class='varop'>$</span><span class='layout'>)</span>
<a name="line-60"></a> <span class='layout'>(</span><span class='varid'>isXmlNCNameStartChar</span> <span class='conop'>:</span> <span class='varid'>repeat</span> <span class='varid'>isXmlNCNameChar</span><span class='layout'>)</span>
<a name="line-61"></a> <span class='varid'>n</span>
<a name="line-62"></a> <span class='layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='comment'>-- |</span>
<a name="line-65"></a><span class='comment'>-- test for wellformed QName, rule [6] XML Namespaces</span>
<a name="line-66"></a><span class='comment'>-- predicate is used in filter 'valdateNamespaces'.</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="isWellformedQualifiedName"></a><span class='definition'>isWellformedQualifiedName</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-69"></a><span class='definition'>isWellformedQualifiedName</span> <span class='varid'>s</span>
<a name="line-70"></a> <span class='keyglyph'>|</span> <span class='varid'>null</span> <span class='varid'>lp</span>
<a name="line-71"></a> <span class='keyglyph'>=</span> <span class='varid'>isNCName</span> <span class='varid'>px</span>
<a name="line-72"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-73"></a> <span class='keyglyph'>=</span> <span class='varid'>isNCName</span> <span class='varid'>px</span> <span class='varop'>&&</span> <span class='varid'>isNCName</span> <span class='layout'>(</span><span class='varid'>tail</span> <span class='varid'>lp</span><span class='layout'>)</span>
<a name="line-74"></a> <span class='keyword'>where</span>
<a name="line-75"></a> <span class='layout'>(</span><span class='varid'>px</span><span class='layout'>,</span> <span class='varid'>lp</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>span</span> <span class='layout'>(</span><span class='varop'>/=</span> <span class='chr'>':'</span><span class='layout'>)</span> <span class='varid'>s</span>
<a name="line-76"></a>
<a name="line-77"></a><span class='comment'>-- |</span>
<a name="line-78"></a><span class='comment'>-- test for wellformed QName values.</span>
<a name="line-79"></a><span class='comment'>-- A QName is wellformed, if the local part is a NCName, the namePrefix, if not empty, is also a NCName.</span>
<a name="line-80"></a><span class='comment'>-- predicate is used in filter 'valdateNamespaces'.</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="isWellformedQName"></a><span class='definition'>isWellformedQName</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-83"></a><span class='definition'>isWellformedQName</span> <span class='varid'>n</span>
<a name="line-84"></a> <span class='keyglyph'>=</span> <span class='varid'>isNCName</span> <span class='varid'>lp</span> <span class='comment'>-- rule [8] XML Namespaces</span>
<a name="line-85"></a> <span class='varop'>&&</span>
<a name="line-86"></a> <span class='layout'>(</span> <span class='varid'>null</span> <span class='varid'>px</span> <span class='comment'>-- rule [6] XML Namespaces</span>
<a name="line-87"></a> <span class='varop'>||</span>
<a name="line-88"></a> <span class='varid'>isNCName</span> <span class='varid'>px</span> <span class='comment'>-- rule [7] XML Namespaces</span>
<a name="line-89"></a> <span class='layout'>)</span>
<a name="line-90"></a> <span class='keyword'>where</span>
<a name="line-91"></a> <span class='varid'>px</span> <span class='keyglyph'>=</span> <span class='varid'>namePrefix</span> <span class='varid'>n</span>
<a name="line-92"></a> <span class='varid'>lp</span> <span class='keyglyph'>=</span> <span class='varid'>localPart</span> <span class='varid'>n</span>
<a name="line-93"></a>
<a name="line-94"></a><span class='comment'>-- |</span>
<a name="line-95"></a><span class='comment'>-- test for a wellformed namespace declaration</span>
<a name="line-96"></a><span class='comment'>-- all namespace prefixes starting with \"xml\" are reserved for XML related definitions.</span>
<a name="line-97"></a><span class='comment'>-- predicate is used in filter 'valdateNamespaces'.</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="isWellformedNSDecl"></a><span class='definition'>isWellformedNSDecl</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-100"></a><span class='definition'>isWellformedNSDecl</span> <span class='varid'>n</span>
<a name="line-101"></a> <span class='keyglyph'>=</span> <span class='varid'>null</span> <span class='varid'>px</span>
<a name="line-102"></a> <span class='varop'>||</span>
<a name="line-103"></a> <span class='varid'>px</span> <span class='varop'>/=</span> <span class='varid'>a_xmlns</span>
<a name="line-104"></a> <span class='varop'>||</span>
<a name="line-105"></a> <span class='layout'>(</span><span class='varid'>take</span> <span class='num'>3</span> <span class='varid'>lp</span><span class='layout'>)</span> <span class='varop'>/=</span> <span class='varid'>a_xml</span>
<a name="line-106"></a> <span class='keyword'>where</span>
<a name="line-107"></a> <span class='varid'>lp</span> <span class='keyglyph'>=</span> <span class='varid'>localPart</span> <span class='varid'>n</span>
<a name="line-108"></a> <span class='varid'>px</span> <span class='keyglyph'>=</span> <span class='varid'>namePrefix</span> <span class='varid'>n</span>
<a name="line-109"></a>
<a name="line-110"></a><span class='comment'>-- |</span>
<a name="line-111"></a><span class='comment'>-- </span>
<a name="line-112"></a><span class='comment'>-- predicate is used in filter 'valdateNamespaces'.</span>
<a name="line-113"></a>
<a name="line-114"></a><a name="isDeclaredNamespace"></a><span class='definition'>isDeclaredNamespace</span> <span class='keyglyph'>::</span> <span class='conid'>QName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-115"></a><span class='definition'>isDeclaredNamespace</span> <span class='varid'>n</span>
<a name="line-116"></a> <span class='keyglyph'>|</span> <span class='varid'>null</span> <span class='varid'>px</span> <span class='comment'>-- no namespace used</span>
<a name="line-117"></a> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-118"></a> <span class='keyglyph'>|</span> <span class='varid'>px</span> <span class='varop'>==</span> <span class='varid'>a_xmlns</span> <span class='comment'>-- "xmlns" has a predefined namespace uri</span>
<a name="line-119"></a> <span class='keyglyph'>=</span> <span class='varid'>ns</span> <span class='varop'>==</span> <span class='varid'>xmlnsNamespace</span>
<a name="line-120"></a> <span class='keyglyph'>|</span> <span class='varid'>px</span> <span class='varop'>==</span> <span class='varid'>a_xml</span> <span class='comment'>-- "xml" has a predefiend namespace"</span>
<a name="line-121"></a> <span class='keyglyph'>=</span> <span class='varid'>ns</span> <span class='varop'>==</span> <span class='varid'>xmlNamespace</span>
<a name="line-122"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='comment'>-- namespace values are not empty</span>
<a name="line-123"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>null</span><span class='layout'>)</span> <span class='varid'>ns</span>
<a name="line-124"></a> <span class='keyword'>where</span>
<a name="line-125"></a> <span class='varid'>px</span> <span class='keyglyph'>=</span> <span class='varid'>namePrefix</span> <span class='varid'>n</span>
<a name="line-126"></a> <span class='varid'>ns</span> <span class='keyglyph'>=</span> <span class='varid'>namespaceUri</span> <span class='varid'>n</span>
<a name="line-127"></a>
<a name="line-128"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
</pre></body>
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