hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-Parser-XmlInput.html
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<pre><a name="line-1"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-2"></a><span class='comment'>--</span>
<a name="line-3"></a><span class='comment'>-- input functions</span>
<a name="line-4"></a><span class='comment'>-- implemented as filer</span>
<a name="line-5"></a><span class='comment'>--</span>
<a name="line-6"></a><span class='comment'>-- Version : $Id: XmlInput.hs,v 1.9 2006/03/03 14:20:17 hxml Exp $</span>
<a name="line-7"></a>
<a name="line-8"></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'>Parser</span><span class='varop'>.</span><span class='conid'>XmlInput</span>
<a name="line-9"></a> <span class='layout'>(</span> <span class='varid'>getXmlContents</span>
<a name="line-10"></a> <span class='layout'>,</span> <span class='varid'>getXmlEntityContents</span>
<a name="line-11"></a> <span class='layout'>,</span> <span class='varid'>getUrlContents</span>
<a name="line-12"></a> <span class='layout'>,</span> <span class='varid'>getContentLength</span>
<a name="line-13"></a> <span class='layout'>,</span> <span class='varid'>guessDocEncoding</span>
<a name="line-14"></a> <span class='layout'>,</span> <span class='varid'>runInLocalURIContext</span>
<a name="line-15"></a> <span class='layout'>,</span> <span class='varid'>runInNewURIContext</span>
<a name="line-16"></a> <span class='layout'>,</span> <span class='varid'>getBaseURI</span>
<a name="line-17"></a> <span class='layout'>,</span> <span class='varid'>setBaseURI</span>
<a name="line-18"></a> <span class='layout'>,</span> <span class='varid'>getAbsolutURI</span>
<a name="line-19"></a> <span class='layout'>,</span> <span class='varid'>isStandaloneDocument</span>
<a name="line-20"></a> <span class='layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></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'>XmlTree</span>
<a name="line-25"></a>
<a name="line-26"></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'>XmlState</span>
<a name="line-27"></a>
<a name="line-28"></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'>Parser</span><span class='varop'>.</span><span class='conid'>DefaultURI</span>
<a name="line-29"></a> <span class='layout'>(</span> <span class='varid'>setDefaultURI</span>
<a name="line-30"></a> <span class='layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></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'>Parser</span><span class='varop'>.</span><span class='conid'>XmlParser</span>
<a name="line-33"></a> <span class='layout'>(</span> <span class='varid'>parseXmlDocEncodingSpec</span>
<a name="line-34"></a> <span class='layout'>,</span> <span class='varid'>parseXmlEntityEncodingSpec</span>
<a name="line-35"></a> <span class='layout'>,</span> <span class='varid'>removeEncodingSpec</span>
<a name="line-36"></a> <span class='layout'>)</span>
<a name="line-37"></a>
<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'>getDecodingFct</span>
<a name="line-40"></a> <span class='layout'>,</span> <span class='varid'>guessEncoding</span>
<a name="line-41"></a> <span class='layout'>,</span> <span class='varid'>normalizeNL</span>
<a name="line-42"></a> <span class='layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></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'>Parser</span><span class='varop'>.</span><span class='conid'>XmlOutput</span>
<a name="line-45"></a> <span class='layout'>(</span> <span class='varid'>traceTree</span>
<a name="line-46"></a> <span class='layout'>,</span> <span class='varid'>traceSource</span>
<a name="line-47"></a> <span class='layout'>,</span> <span class='varid'>traceMsg</span>
<a name="line-48"></a> <span class='layout'>)</span>
<a name="line-49"></a>
<a name="line-50"></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'>Parser</span><span class='varop'>.</span><span class='conid'>ProtocolHandler</span>
<a name="line-51"></a> <span class='layout'>(</span> <span class='varid'>getProtocolHandler</span>
<a name="line-52"></a> <span class='layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-55"></a><span class='comment'>--</span>
<a name="line-56"></a><span class='comment'>-- URI manipulation</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='keyword'>import</span> <span class='conid'>Network</span><span class='varop'>.</span><span class='conid'>URI</span>
<a name="line-59"></a> <span class='layout'>(</span> <span class='varid'>parseURIReference</span>
<a name="line-60"></a> <span class='layout'>,</span> <span class='varid'>relativeTo</span>
<a name="line-61"></a> <span class='layout'>,</span> <span class='varid'>uriScheme</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'>--</span>
<a name="line-66"></a><span class='comment'>-- utilities</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-69"></a>
<a name="line-70"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-71"></a><span class='comment'>--</span>
<a name="line-72"></a><span class='comment'>-- filter for reading the content</span>
<a name="line-73"></a><span class='comment'>-- input: a root node with arguments in tag attribute list</span>
<a name="line-74"></a><span class='comment'>-- and without any children.</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='comment'>-- attribute a_source ("source") for input file or uri</span>
<a name="line-77"></a><span class='comment'>--</span>
<a name="line-78"></a><span class='comment'>-- attribute a_encoding ("encoding") for encoding scheme</span>
<a name="line-79"></a><span class='comment'>--</span>
<a name="line-80"></a><span class='comment'>-- attribute a_proxy ("proxy") for proxy tob be used in http access</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="getXmlContents'"></a><span class='definition'>getXmlContents'</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span> <span class='keyglyph'>-></span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-83"></a><span class='definition'>getXmlContents'</span> <span class='varid'>parseEncodingSpec</span>
<a name="line-84"></a> <span class='keyglyph'>=</span> <span class='varid'>getContent'</span>
<a name="line-85"></a> <span class='varop'>`whenM`</span> <span class='varid'>isRoot</span>
<a name="line-86"></a> <span class='keyword'>where</span>
<a name="line-87"></a> <span class='varid'>getContent'</span> <span class='varid'>t'</span>
<a name="line-88"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>liftMf</span> <span class='layout'>(</span><span class='varid'>setStatus</span> <span class='varid'>c_ok</span> <span class='str'>"getXmlContents"</span><span class='layout'>)</span>
<a name="line-89"></a> <span class='varop'>.>></span>
<a name="line-90"></a> <span class='varid'>getUrlContents</span>
<a name="line-91"></a> <span class='varop'>.>></span>
<a name="line-92"></a> <span class='varid'>liftF</span> <span class='varid'>parseEncodingSpec</span>
<a name="line-93"></a> <span class='varop'>.>></span>
<a name="line-94"></a> <span class='varid'>guessDocEncoding</span>
<a name="line-95"></a> <span class='varop'>.>></span>
<a name="line-96"></a> <span class='varid'>traceMsg</span> <span class='num'>1</span> <span class='layout'>(</span><span class='str'>"getXmlContents: content read and decoded from "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>input'</span><span class='layout'>)</span>
<a name="line-97"></a> <span class='varop'>.>></span>
<a name="line-98"></a> <span class='varid'>traceTree</span>
<a name="line-99"></a> <span class='varop'>.>></span>
<a name="line-100"></a> <span class='varid'>traceSource</span>
<a name="line-101"></a> <span class='layout'>)</span> <span class='varid'>t'</span>
<a name="line-102"></a> <span class='keyword'>where</span>
<a name="line-103"></a> <span class='varid'>input'</span> <span class='keyglyph'>=</span> <span class='varid'>valueOf</span> <span class='varid'>a_source</span> <span class='varid'>t'</span>
<a name="line-104"></a>
<a name="line-105"></a><span class='comment'>-- |</span>
<a name="line-106"></a><span class='comment'>-- filter for reading the content of a XML document</span>
<a name="line-107"></a><span class='comment'>--</span>
<a name="line-108"></a><span class='comment'>-- input is a root node with the source as an attibute</span>
<a name="line-109"></a><span class='comment'>-- the text is read, the encoding scheme is parsed and selected</span>
<a name="line-110"></a><span class='comment'>-- and the input is translated into the internal UTF-8 string representation</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="getXmlContents"></a><span class='definition'>getXmlContents</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-113"></a><span class='definition'>getXmlContents</span>
<a name="line-114"></a> <span class='keyglyph'>=</span> <span class='varid'>getXmlContents'</span> <span class='varid'>parseXmlDocEncodingSpec</span>
<a name="line-115"></a> <span class='varop'>.>></span>
<a name="line-116"></a> <span class='varid'>setBaseURIFilter</span>
<a name="line-117"></a> <span class='varop'>.>></span>
<a name="line-118"></a> <span class='varid'>setStandAloneFilter</span>
<a name="line-119"></a>
<a name="line-120"></a><span class='comment'>-- |</span>
<a name="line-121"></a><span class='comment'>-- filter for reading the content of an external XML entity</span>
<a name="line-122"></a><span class='comment'>--</span>
<a name="line-123"></a><span class='comment'>--</span>
<a name="line-124"></a><span class='comment'>-- see also : 'getXmlContents'</span>
<a name="line-125"></a>
<a name="line-126"></a><a name="getXmlEntityContents"></a><span class='definition'>getXmlEntityContents</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-127"></a><span class='definition'>getXmlEntityContents</span>
<a name="line-128"></a> <span class='keyglyph'>=</span> <span class='varid'>getXmlContents'</span> <span class='varid'>parseXmlEntityEncodingSpec</span>
<a name="line-129"></a> <span class='varop'>.>></span>
<a name="line-130"></a> <span class='varid'>liftF</span> <span class='layout'>(</span><span class='varid'>processChildren</span> <span class='varid'>removeEncodingSpec</span><span class='layout'>)</span> <span class='comment'>-- remove encoding spec, it's not part of the entity value</span>
<a name="line-131"></a> <span class='varop'>.>></span>
<a name="line-132"></a> <span class='varid'>setBaseURIFilter</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="setBaseURIFilter"></a><span class='definition'>setBaseURIFilter</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-137"></a><span class='definition'>setBaseURIFilter</span>
<a name="line-138"></a> <span class='keyglyph'>=</span> <span class='varid'>performAction</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>t</span> <span class='keyglyph'>-></span> <span class='varid'>setBaseURI</span> <span class='layout'>(</span><span class='varid'>valueOf</span> <span class='varid'>transferURI</span> <span class='varid'>t</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-139"></a> <span class='varop'>`whenM`</span> <span class='varid'>isRoot</span>
<a name="line-140"></a>
<a name="line-141"></a><span class='comment'>-- |</span>
<a name="line-142"></a><span class='comment'>-- filter command for saving and restoring</span>
<a name="line-143"></a><span class='comment'>-- the base URI</span>
<a name="line-144"></a><span class='comment'>--</span>
<a name="line-145"></a><span class='comment'>-- * 1.parameter f : the filter that possible changes the base URI</span>
<a name="line-146"></a><span class='comment'>--</span>
<a name="line-147"></a><span class='comment'>--</span>
<a name="line-148"></a><span class='comment'>-- - returns : a filter with the same effect as f, that restores the base URI after application of f</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="runInLocalURIContext"></a><span class='definition'>runInLocalURIContext</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-151"></a><span class='definition'>runInLocalURIContext</span> <span class='varid'>f</span> <span class='varid'>t</span>
<a name="line-152"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-153"></a> <span class='varid'>oldContext</span> <span class='keyglyph'><-</span> <span class='varid'>getBaseURI</span>
<a name="line-154"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"runInLocalURIContext: save base URI "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>oldContext</span><span class='layout'>)</span>
<a name="line-155"></a> <span class='varid'>res</span> <span class='keyglyph'><-</span> <span class='varid'>f</span> <span class='varid'>t</span>
<a name="line-156"></a> <span class='varid'>setBaseURI</span> <span class='varid'>oldContext</span>
<a name="line-157"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"runInLocalURIContext: restore base URI "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>oldContext</span><span class='layout'>)</span>
<a name="line-158"></a> <span class='varid'>return</span> <span class='varid'>res</span>
<a name="line-159"></a>
<a name="line-160"></a><span class='comment'>-- |</span>
<a name="line-161"></a><span class='comment'>-- filter command for running an action in a new URI context</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="runInNewURIContext"></a><span class='definition'>runInNewURIContext</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span> <span class='keyglyph'>-></span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-164"></a><span class='definition'>runInNewURIContext</span> <span class='varid'>uri</span> <span class='varid'>f</span>
<a name="line-165"></a> <span class='keyglyph'>|</span> <span class='varid'>null</span> <span class='varid'>uri</span>
<a name="line-166"></a> <span class='keyglyph'>=</span> <span class='varid'>f</span>
<a name="line-167"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-168"></a> <span class='keyglyph'>=</span> <span class='varid'>runInLocalURIContext</span>
<a name="line-169"></a> <span class='layout'>(</span> <span class='keyglyph'>\</span> <span class='varid'>t</span> <span class='keyglyph'>-></span> <span class='layout'>(</span> <span class='keyword'>do</span>
<a name="line-170"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"runInNewURIContext: new base URI "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>uri</span><span class='layout'>)</span>
<a name="line-171"></a> <span class='varid'>setBaseURI</span> <span class='varid'>uri</span>
<a name="line-172"></a> <span class='varid'>f</span> <span class='varid'>t</span>
<a name="line-173"></a> <span class='layout'>)</span>
<a name="line-174"></a> <span class='layout'>)</span>
<a name="line-175"></a>
<a name="line-176"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-177"></a><span class='comment'>-- |</span>
<a name="line-178"></a><span class='comment'>-- guessEncoding uses encoding attribute and content</span>
<a name="line-179"></a><span class='comment'>-- to determine the encoding scheme.</span>
<a name="line-180"></a><span class='comment'>--</span>
<a name="line-181"></a><span class='comment'>-- it's assumed that an encoding spec has been tried to parse before guessing the encoding.</span>
<a name="line-182"></a><span class='comment'>--</span>
<a name="line-183"></a><span class='comment'>-- UTF-8 is the default encoding</span>
<a name="line-184"></a><span class='comment'>--</span>
<a name="line-185"></a><span class='comment'>-- other supported encodings are ISO-8859-1 (also known as ISO-Latin-1),</span>
<a name="line-186"></a><span class='comment'>-- US-ASCII, UTF-16 or ISO-10646-UCS-2, UTF-16BE, UTF-16LE</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="guessDocEncoding"></a><span class='definition'>guessDocEncoding</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-189"></a><span class='definition'>guessDocEncoding</span>
<a name="line-190"></a> <span class='keyglyph'>=</span> <span class='varid'>addDocEncoding</span>
<a name="line-191"></a> <span class='varop'>`whenM`</span> <span class='varid'>isRoot</span>
<a name="line-192"></a> <span class='keyword'>where</span>
<a name="line-193"></a> <span class='varid'>addDocEncoding</span> <span class='varid'>n'</span>
<a name="line-194"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-195"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span> <span class='str'>"guessDocEncoding: encoding is "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>guess</span><span class='layout'>)</span>
<a name="line-196"></a> <span class='layout'>(</span> <span class='varid'>encFilter</span> <span class='layout'>(</span><span class='varid'>getDecodingFct</span> <span class='varid'>guess</span><span class='layout'>)</span>
<a name="line-197"></a> <span class='varop'>.>></span>
<a name="line-198"></a> <span class='varid'>issueError</span>
<a name="line-199"></a> <span class='varop'>.>></span>
<a name="line-200"></a> <span class='varid'>liftMf</span> <span class='layout'>(</span><span class='varid'>addAttr</span> <span class='varid'>transferEncoding</span> <span class='varid'>guess</span><span class='layout'>)</span> <span class='layout'>)</span> <span class='varid'>n'</span>
<a name="line-201"></a> <span class='keyword'>where</span>
<a name="line-202"></a> <span class='varid'>guess</span> <span class='keyglyph'>::</span> <span class='conid'>String</span>
<a name="line-203"></a> <span class='varid'>guess</span> <span class='keyglyph'>=</span> <span class='varid'>head</span> <span class='varop'>.</span> <span class='varid'>filter</span> <span class='layout'>(</span><span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>null</span><span class='layout'>)</span>
<a name="line-204"></a> <span class='varop'>$</span> <span class='keyglyph'>[</span> <span class='layout'>(</span><span class='varid'>guessEncoding</span> <span class='varop'>.</span> <span class='varid'>showXText</span> <span class='varop'>.</span> <span class='varid'>getChildren</span><span class='layout'>)</span> <span class='varid'>n'</span>
<a name="line-205"></a> <span class='layout'>,</span> <span class='varid'>valueOf</span> <span class='varid'>transferEncoding</span> <span class='varid'>n'</span>
<a name="line-206"></a> <span class='layout'>,</span> <span class='varid'>valueOf</span> <span class='varid'>a_encoding</span> <span class='varid'>n'</span>
<a name="line-207"></a> <span class='layout'>,</span> <span class='varid'>utf8</span>
<a name="line-208"></a> <span class='keyglyph'>]</span>
<a name="line-209"></a> <span class='varid'>encFilter</span> <span class='layout'>(</span><span class='conid'>Just</span> <span class='varid'>fct</span><span class='layout'>)</span>
<a name="line-210"></a> <span class='keyglyph'>=</span> <span class='varid'>decodeDoc</span> <span class='varid'>fct</span>
<a name="line-211"></a>
<a name="line-212"></a> <span class='varid'>encFilter</span> <span class='conid'>Nothing</span>
<a name="line-213"></a> <span class='keyglyph'>=</span> <span class='varid'>addFatal</span> <span class='layout'>(</span><span class='str'>"encoding scheme not supported: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>guess</span><span class='layout'>)</span>
<a name="line-214"></a>
<a name="line-215"></a> <span class='varid'>decodeDoc</span> <span class='varid'>df</span> <span class='varid'>n''</span>
<a name="line-216"></a> <span class='keyglyph'>|</span> <span class='varid'>null</span> <span class='varid'>errs</span> <span class='keyglyph'>=</span> <span class='varid'>liftMf</span> <span class='layout'>(</span><span class='varid'>replaceChildren</span> <span class='layout'>(</span><span class='varid'>xtext</span> <span class='layout'>(</span><span class='varid'>normalizeNL</span> <span class='varid'>res</span><span class='layout'>)</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>$</span> <span class='varid'>n''</span>
<a name="line-217"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>liftMf</span> <span class='layout'>(</span><span class='varid'>replaceChildren</span> <span class='layout'>(</span><span class='varid'>xtext</span> <span class='str'>""</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-218"></a> <span class='varop'>.>></span>
<a name="line-219"></a> <span class='layout'>(</span> <span class='varid'>issueDecodingErrs</span>
<a name="line-220"></a> <span class='varop'>+++>></span>
<a name="line-221"></a> <span class='varid'>addFatal</span> <span class='str'>"decoding errors detected"</span>
<a name="line-222"></a> <span class='layout'>)</span>
<a name="line-223"></a> <span class='layout'>)</span> <span class='varid'>n''</span>
<a name="line-224"></a> <span class='keyword'>where</span>
<a name="line-225"></a> <span class='varid'>str</span> <span class='keyglyph'>=</span> <span class='varid'>xshow</span> <span class='varop'>.</span> <span class='varid'>getChildren</span> <span class='varop'>$</span> <span class='varid'>n''</span>
<a name="line-226"></a> <span class='layout'>(</span><span class='varid'>res</span><span class='layout'>,</span> <span class='varid'>errs</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>df</span> <span class='varid'>str</span>
<a name="line-227"></a> <span class='varid'>issueDecodingErrs</span> <span class='keyglyph'>=</span> <span class='varid'>catM</span> <span class='varop'>.</span> <span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>issueErr</span> <span class='varop'>.</span> <span class='layout'>(</span><span class='varid'>guess</span> <span class='varop'>++</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='layout'>(</span><span class='str'>" encoding error"</span> <span class='varop'>++</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>$</span> <span class='varid'>errs</span>
<a name="line-228"></a>
<a name="line-229"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-230"></a>
<a name="line-231"></a><a name="getDefaultURI"></a><span class='definition'>getDefaultURI</span> <span class='keyglyph'>::</span> <span class='conid'>XState</span> <span class='varid'>state</span> <span class='conid'>String</span>
<a name="line-232"></a><span class='definition'>getDefaultURI</span>
<a name="line-233"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-234"></a> <span class='varid'>uri</span> <span class='keyglyph'><-</span> <span class='varid'>getSysParam</span> <span class='varid'>transferDefaultURI</span>
<a name="line-235"></a> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>uri</span>
<a name="line-236"></a> <span class='keyword'>then</span> <span class='keyword'>do</span>
<a name="line-237"></a> <span class='varid'>setDefaultURI</span>
<a name="line-238"></a> <span class='varid'>getDefaultURI</span>
<a name="line-239"></a> <span class='keyword'>else</span> <span class='varid'>return</span> <span class='varid'>uri</span>
<a name="line-240"></a>
<a name="line-241"></a><span class='comment'>-- |</span>
<a name="line-242"></a><span class='comment'>-- set the base URI, all other URIs are handled relative to this base URI</span>
<a name="line-243"></a><span class='comment'>--</span>
<a name="line-244"></a><span class='comment'>-- the default base URI is @file:\/\/\/\<current-working-dir\>\/@</span>
<a name="line-245"></a><span class='comment'>--</span>
<a name="line-246"></a><span class='comment'>-- see also : 'getBaseURI'</span>
<a name="line-247"></a>
<a name="line-248"></a><a name="setBaseURI"></a><span class='definition'>setBaseURI</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XState</span> <span class='varid'>state</span> <span class='conid'>()</span>
<a name="line-249"></a><span class='definition'>setBaseURI</span> <span class='varid'>str</span>
<a name="line-250"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-251"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"setBaseURI: new base URI: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>str</span><span class='layout'>)</span>
<a name="line-252"></a> <span class='varid'>setSysParam</span> <span class='varid'>transferURI</span> <span class='varid'>str</span>
<a name="line-253"></a>
<a name="line-254"></a><span class='comment'>-- |</span>
<a name="line-255"></a><span class='comment'>-- read the current base URI</span>
<a name="line-256"></a><span class='comment'>--</span>
<a name="line-257"></a><span class='comment'>-- see also : 'setBaseURI'</span>
<a name="line-258"></a>
<a name="line-259"></a><a name="getBaseURI"></a><span class='definition'>getBaseURI</span> <span class='keyglyph'>::</span> <span class='conid'>XState</span> <span class='varid'>state</span> <span class='conid'>String</span>
<a name="line-260"></a><span class='definition'>getBaseURI</span>
<a name="line-261"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-262"></a> <span class='varid'>uri</span> <span class='keyglyph'><-</span> <span class='varid'>getSysParam</span> <span class='varid'>transferURI</span>
<a name="line-263"></a> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>uri</span>
<a name="line-264"></a> <span class='keyword'>then</span> <span class='keyword'>do</span>
<a name="line-265"></a> <span class='varid'>res</span> <span class='keyglyph'><-</span> <span class='varid'>getDefaultURI</span>
<a name="line-266"></a> <span class='varid'>setBaseURI</span> <span class='varid'>res</span>
<a name="line-267"></a> <span class='varid'>getBaseURI</span>
<a name="line-268"></a> <span class='keyword'>else</span> <span class='varid'>return</span> <span class='varid'>uri</span>
<a name="line-269"></a>
<a name="line-270"></a><span class='comment'>-- |</span>
<a name="line-271"></a><span class='comment'>-- transform an URI into an absolut URI using the current base URI</span>
<a name="line-272"></a><span class='comment'>--</span>
<a name="line-273"></a><span class='comment'>--</span>
<a name="line-274"></a><span class='comment'>-- * 1.parameter uri : the URI as string</span>
<a name="line-275"></a><span class='comment'>--</span>
<a name="line-276"></a><span class='comment'>--</span>
<a name="line-277"></a><span class='comment'>-- - returns : the absolut URI as string or \"\" in case of an error</span>
<a name="line-278"></a>
<a name="line-279"></a><a name="getAbsolutURI"></a><span class='definition'>getAbsolutURI</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XState</span> <span class='varid'>state</span> <span class='conid'>String</span>
<a name="line-280"></a><span class='definition'>getAbsolutURI</span> <span class='varid'>uri</span>
<a name="line-281"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-282"></a> <span class='varid'>baseUri</span> <span class='keyglyph'><-</span> <span class='varid'>getBaseURI</span>
<a name="line-283"></a> <span class='varid'>return</span> <span class='varop'>$</span> <span class='varid'>expandURI</span> <span class='varid'>uri</span> <span class='varid'>baseUri</span>
<a name="line-284"></a>
<a name="line-285"></a><a name="expandURI"></a><span class='definition'>expandURI</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'>String</span>
<a name="line-286"></a><span class='definition'>expandURI</span> <span class='varid'>uri</span> <span class='varid'>base</span>
<a name="line-287"></a> <span class='keyglyph'>=</span> <span class='varid'>fromMaybe</span> <span class='str'>""</span> <span class='varop'>$</span> <span class='varid'>expand</span>
<a name="line-288"></a> <span class='keyword'>where</span>
<a name="line-289"></a> <span class='varid'>expand</span> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-290"></a> <span class='varid'>base'</span> <span class='keyglyph'><-</span> <span class='varid'>parseURIReference</span> <span class='varid'>base</span>
<a name="line-291"></a> <span class='varid'>uri'</span> <span class='keyglyph'><-</span> <span class='varid'>parseURIReference</span> <span class='varid'>uri</span>
<a name="line-292"></a> <span class='varid'>abs'</span> <span class='keyglyph'><-</span> <span class='varid'>relativeTo</span> <span class='varid'>uri'</span> <span class='varid'>base'</span>
<a name="line-293"></a> <span class='varid'>return</span> <span class='varop'>$</span> <span class='varid'>show</span> <span class='varid'>abs'</span>
<a name="line-294"></a>
<a name="line-295"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-296"></a>
<a name="line-297"></a><a name="setStandAloneFilter"></a><span class='definition'>setStandAloneFilter</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-298"></a><span class='definition'>setStandAloneFilter</span>
<a name="line-299"></a> <span class='keyglyph'>=</span> <span class='varid'>performAction</span> <span class='varid'>setStandAlone</span>
<a name="line-300"></a> <span class='keyword'>where</span>
<a name="line-301"></a> <span class='varid'>setStandAlone</span> <span class='varid'>t</span>
<a name="line-302"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-303"></a> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>standalone</span>
<a name="line-304"></a> <span class='keyword'>then</span> <span class='varid'>return</span> <span class='conid'>()</span>
<a name="line-305"></a> <span class='keyword'>else</span> <span class='keyword'>do</span>
<a name="line-306"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"setStandAloneFilter: standalone="</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>standaloneVal</span><span class='layout'>)</span>
<a name="line-307"></a> <span class='varid'>setSysParam</span> <span class='varid'>a_standalone</span> <span class='varid'>standaloneVal</span>
<a name="line-308"></a> <span class='keyword'>where</span>
<a name="line-309"></a> <span class='varid'>standalone</span> <span class='keyglyph'>=</span> <span class='varid'>getValue</span> <span class='varid'>a_standalone</span> <span class='varid'>t</span>
<a name="line-310"></a> <span class='varid'>standaloneVal</span> <span class='keyglyph'>=</span> <span class='varid'>showXText</span> <span class='varid'>standalone</span>
<a name="line-311"></a>
<a name="line-312"></a><span class='comment'>-- |</span>
<a name="line-313"></a><span class='comment'>-- predicate for testing the standalone document attribute</span>
<a name="line-314"></a>
<a name="line-315"></a><a name="isStandaloneDocument"></a><span class='definition'>isStandaloneDocument</span> <span class='keyglyph'>::</span> <span class='conid'>XState</span> <span class='varid'>state</span> <span class='conid'>Bool</span>
<a name="line-316"></a><span class='definition'>isStandaloneDocument</span>
<a name="line-317"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-318"></a> <span class='varid'>val</span> <span class='keyglyph'><-</span> <span class='varid'>getSysParam</span> <span class='varid'>a_standalone</span>
<a name="line-319"></a> <span class='varid'>return</span> <span class='layout'>(</span><span class='varid'>val</span> <span class='varop'>==</span> <span class='str'>"yes"</span><span class='layout'>)</span>
<a name="line-320"></a>
<a name="line-321"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-322"></a>
<a name="line-323"></a><span class='comment'>-- |</span>
<a name="line-324"></a><span class='comment'>-- the hard io operations</span>
<a name="line-325"></a><span class='comment'>--</span>
<a name="line-326"></a><span class='comment'>-- for reading a file or accessing a document via http</span>
<a name="line-327"></a><span class='comment'>-- input must be a root node with a @source@ attribute specifying the URI</span>
<a name="line-328"></a>
<a name="line-329"></a><a name="getUrlContents"></a><span class='definition'>getUrlContents</span> <span class='keyglyph'>::</span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-330"></a><span class='definition'>getUrlContents</span>
<a name="line-331"></a> <span class='keyglyph'>=</span> <span class='varid'>getCont</span>
<a name="line-332"></a> <span class='varop'>`whenM`</span> <span class='varid'>isRoot</span>
<a name="line-333"></a> <span class='keyword'>where</span>
<a name="line-334"></a> <span class='varid'>getCont</span> <span class='varid'>n'</span>
<a name="line-335"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-336"></a> <span class='varid'>trace</span> <span class='num'>1</span> <span class='layout'>(</span><span class='str'>"getUrlContent: reading "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>src</span><span class='layout'>)</span>
<a name="line-337"></a> <span class='varid'>uri</span> <span class='keyglyph'><-</span> <span class='varid'>getAbsolutURI</span> <span class='varid'>src</span>
<a name="line-338"></a> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>uri</span>
<a name="line-339"></a> <span class='keyword'>then</span> <span class='varid'>urlErr</span> <span class='layout'>(</span> <span class='str'>"illegal URI for input: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>src</span> <span class='layout'>)</span>
<a name="line-340"></a> <span class='keyword'>else</span> <span class='keyword'>let</span>
<a name="line-341"></a> <span class='varid'>uri'</span> <span class='keyglyph'>=</span> <span class='varid'>fromJust</span> <span class='varop'>$</span> <span class='varid'>parseURIReference</span> <span class='varid'>uri</span>
<a name="line-342"></a> <span class='varid'>proto</span> <span class='keyglyph'>=</span> <span class='varid'>init</span> <span class='varop'>.</span> <span class='varid'>uriScheme</span> <span class='varop'>$</span> <span class='varid'>uri'</span>
<a name="line-343"></a> <span class='varid'>handler</span> <span class='keyglyph'>=</span> <span class='varid'>getProtocolHandler</span> <span class='varid'>proto</span>
<a name="line-344"></a> <span class='keyword'>in</span>
<a name="line-345"></a> <span class='layout'>(</span> <span class='varid'>liftMf</span> <span class='layout'>(</span><span class='varid'>addAttr</span> <span class='varid'>transferProtocol</span> <span class='varid'>proto</span>
<a name="line-346"></a> <span class='varop'>.></span>
<a name="line-347"></a> <span class='varid'>addAttr</span> <span class='varid'>transferURI</span> <span class='varid'>uri</span>
<a name="line-348"></a> <span class='layout'>)</span>
<a name="line-349"></a> <span class='varop'>.>></span>
<a name="line-350"></a> <span class='varid'>handler</span> <span class='varid'>uri'</span>
<a name="line-351"></a> <span class='layout'>)</span> <span class='varop'>$</span> <span class='varid'>n'</span>
<a name="line-352"></a> <span class='keyword'>where</span>
<a name="line-353"></a> <span class='varid'>src</span> <span class='keyglyph'>=</span> <span class='varid'>valueOf</span> <span class='varid'>a_source</span> <span class='varid'>n'</span>
<a name="line-354"></a> <span class='varid'>urlErr</span> <span class='varid'>msg</span> <span class='keyglyph'>=</span> <span class='varid'>addFatal</span> <span class='varid'>msg</span> <span class='varid'>n'</span>
<a name="line-355"></a>
<a name="line-356"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-357"></a>
<a name="line-358"></a><span class='comment'>-- |</span>
<a name="line-359"></a><span class='comment'>-- compute the length of the data for a document read previously</span>
<a name="line-360"></a><span class='comment'>-- by a call of 'getUrlContents. The result is stored as an attribute</span>
<a name="line-361"></a><span class='comment'>-- value in the document root node. the attribute name is 'a_contentLength'</span>
<a name="line-362"></a>
<a name="line-363"></a><a name="getContentLength"></a><span class='definition'>getContentLength</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-364"></a><span class='definition'>getContentLength</span>
<a name="line-365"></a> <span class='keyglyph'>=</span> <span class='varid'>addAttrl</span> <span class='varid'>contentLengthAttr</span>
<a name="line-366"></a> <span class='varop'>`when`</span> <span class='varid'>isRoot</span>
<a name="line-367"></a> <span class='keyword'>where</span>
<a name="line-368"></a> <span class='varid'>http_contentLength</span> <span class='keyglyph'>=</span> <span class='varid'>httpPrefix</span> <span class='varop'>++</span> <span class='str'>"Content-Length"</span>
<a name="line-369"></a>
<a name="line-370"></a> <span class='varid'>contentLengthAttr</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-371"></a> <span class='varid'>contentLengthAttr</span> <span class='varid'>t</span>
<a name="line-372"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='keyglyph'>[</span> <span class='varid'>hasAttr</span> <span class='varid'>a_contentLength</span>
<a name="line-373"></a> <span class='conop'>:-></span> <span class='varid'>none</span>
<a name="line-374"></a> <span class='layout'>,</span> <span class='varid'>hasAttr</span> <span class='varid'>http_contentLength</span>
<a name="line-375"></a> <span class='conop'>:-></span> <span class='varid'>mkXAttr</span> <span class='varid'>a_contentLength</span> <span class='layout'>(</span><span class='varid'>getValue</span> <span class='varid'>http_contentLength</span><span class='layout'>)</span>
<a name="line-376"></a> <span class='layout'>,</span> <span class='varid'>this</span>
<a name="line-377"></a> <span class='conop'>:-></span> <span class='varid'>mkXAttr</span> <span class='varid'>a_contentLength</span> <span class='varid'>getLength</span>
<a name="line-378"></a> <span class='keyglyph'>]</span> <span class='varid'>t</span>
<a name="line-379"></a>
<a name="line-380"></a> <span class='varid'>getLength</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-381"></a> <span class='varid'>getLength</span> <span class='varid'>t</span>
<a name="line-382"></a> <span class='keyglyph'>=</span> <span class='varid'>xtext</span> <span class='layout'>(</span><span class='varid'>show</span> <span class='varop'>.</span> <span class='varid'>length</span> <span class='varop'>.</span> <span class='varid'>xshow</span> <span class='varop'>.</span> <span class='varid'>getChildren</span> <span class='varop'>$</span> <span class='varid'>t</span><span class='layout'>)</span>
<a name="line-383"></a>
<a name="line-384"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
</html>