hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-Parser-ProtocolHandlerFile.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'>-- protocol handler function for file protocol</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: ProtocolHandlerFile.hs,v 1.5 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'>ProtocolHandlerFile</span>
<a name="line-9"></a> <span class='layout'>(</span> <span class='varid'>getFileContents</span>
<a name="line-10"></a> <span class='layout'>)</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='keyword'>where</span>
<a name="line-13"></a>
<a name="line-14"></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-15"></a>
<a name="line-16"></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-17"></a>
<a name="line-18"></a><span class='keyword'>import</span> <span class='conid'>System</span><span class='varop'>.</span><span class='conid'>Directory</span>
<a name="line-19"></a> <span class='layout'>(</span> <span class='varid'>doesFileExist</span>
<a name="line-20"></a> <span class='layout'>,</span> <span class='varid'>getPermissions</span>
<a name="line-21"></a> <span class='layout'>,</span> <span class='varid'>readable</span>
<a name="line-22"></a> <span class='layout'>)</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='keyword'>import</span> <span class='conid'>Network</span><span class='varop'>.</span><span class='conid'>URI</span>
<a name="line-25"></a> <span class='layout'>(</span> <span class='conid'>URI</span>
<a name="line-26"></a> <span class='layout'>,</span> <span class='varid'>unEscapeString</span>
<a name="line-27"></a> <span class='layout'>,</span> <span class='varid'>uriPath</span>
<a name="line-28"></a> <span class='layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='keyword'>import</span> <span class='conid'>System</span><span class='varop'>.</span><span class='conid'>IO</span>
<a name="line-31"></a><span class='keyword'>import</span> <span class='conid'>System</span><span class='varop'>.</span><span class='conid'>IO</span><span class='varop'>.</span><span class='conid'>Error</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-34"></a><span class='comment'>--</span>
<a name="line-35"></a><span class='comment'>-- the file protocol handler</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="getFileContents"></a><span class='definition'>getFileContents</span> <span class='keyglyph'>::</span> <span class='conid'>URI</span> <span class='keyglyph'>-></span> <span class='conid'>XmlStateFilter</span> <span class='varid'>a</span>
<a name="line-38"></a><span class='definition'>getFileContents</span> <span class='varid'>uri</span> <span class='varid'>n</span>
<a name="line-39"></a> <span class='keyglyph'>=</span> <span class='keyword'>do</span>
<a name="line-40"></a> <span class='varid'>trace</span> <span class='num'>2</span> <span class='layout'>(</span><span class='str'>"getFileContent: reading file "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>source</span><span class='layout'>)</span>
<a name="line-41"></a> <span class='varid'>exists</span> <span class='keyglyph'><-</span> <span class='varid'>io</span> <span class='varop'>$</span> <span class='varid'>doesFileExist</span> <span class='varid'>source</span>
<a name="line-42"></a> <span class='keyword'>if</span> <span class='varid'>exists</span>
<a name="line-43"></a> <span class='keyword'>then</span> <span class='keyword'>do</span>
<a name="line-44"></a> <span class='varid'>perm</span> <span class='keyglyph'><-</span> <span class='varid'>io</span> <span class='varop'>$</span> <span class='varid'>getPermissions</span> <span class='varid'>source</span>
<a name="line-45"></a> <span class='keyword'>if</span> <span class='varid'>readable</span> <span class='varid'>perm</span>
<a name="line-46"></a> <span class='keyword'>then</span> <span class='keyword'>do</span>
<a name="line-47"></a> <span class='varid'>h</span> <span class='keyglyph'><-</span> <span class='varid'>io</span> <span class='varop'>$</span> <span class='varid'>try</span> <span class='layout'>(</span> <span class='varid'>openFile</span> <span class='varid'>source</span> <span class='conid'>ReadMode</span> <span class='layout'>)</span>
<a name="line-48"></a> <span class='keyword'>case</span> <span class='varid'>h</span> <span class='keyword'>of</span>
<a name="line-49"></a> <span class='conid'>Left</span> <span class='varid'>e</span>
<a name="line-50"></a> <span class='keyglyph'>-></span> <span class='varid'>readErr</span> <span class='layout'>(</span> <span class='str'>"system error when reading file "</span>
<a name="line-51"></a> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>source</span>
<a name="line-52"></a> <span class='varop'>++</span> <span class='str'>": "</span>
<a name="line-53"></a> <span class='varop'>++</span> <span class='varid'>ioeGetErrorString</span> <span class='varid'>e</span>
<a name="line-54"></a> <span class='layout'>)</span>
<a name="line-55"></a> <span class='conid'>Right</span> <span class='varid'>h'</span>
<a name="line-56"></a> <span class='keyglyph'>-></span> <span class='keyword'>do</span>
<a name="line-57"></a> <span class='varid'>c</span> <span class='keyglyph'><-</span> <span class='varid'>io</span> <span class='varop'>$</span> <span class='varid'>hGetContents</span> <span class='varid'>h'</span>
<a name="line-58"></a> <span class='varid'>return</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>addAttrInt</span> <span class='varid'>transferStatus</span> <span class='num'>200</span>
<a name="line-59"></a> <span class='varop'>.></span>
<a name="line-60"></a> <span class='varid'>addAttr</span> <span class='varid'>transferMessage</span> <span class='str'>"OK"</span>
<a name="line-61"></a> <span class='varop'>.></span>
<a name="line-62"></a> <span class='varid'>replaceChildren</span> <span class='layout'>(</span><span class='varid'>xtext</span> <span class='varid'>c</span><span class='layout'>)</span>
<a name="line-63"></a> <span class='layout'>)</span> <span class='varid'>n</span>
<a name="line-64"></a> <span class='layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a> <span class='keyword'>else</span> <span class='varid'>readErr</span> <span class='layout'>(</span><span class='str'>"file "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>source</span> <span class='varop'>++</span> <span class='str'>" not readable"</span><span class='layout'>)</span>
<a name="line-67"></a> <span class='keyword'>else</span> <span class='varid'>readErr</span> <span class='layout'>(</span><span class='str'>"file "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>source</span> <span class='varop'>++</span> <span class='str'>" not found"</span><span class='layout'>)</span>
<a name="line-68"></a> <span class='keyword'>where</span>
<a name="line-69"></a> <span class='varid'>source</span> <span class='keyglyph'>=</span> <span class='varid'>fileUriPath</span> <span class='varop'>.</span> <span class='varid'>unEscapeString</span> <span class='varop'>.</span> <span class='varid'>uriPath</span> <span class='varop'>$</span> <span class='varid'>uri</span>
<a name="line-70"></a> <span class='varid'>readErr</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-71"></a>
<a name="line-72"></a> <span class='comment'>-- remove leading / if file starts with windows drive letter, e.g. /c:/windows -> c:/windows</span>
<a name="line-73"></a> <span class='varid'>fileUriPath</span> <span class='layout'>(</span><span class='chr'>'/'</span> <span class='conop'>:</span> <span class='varid'>file</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='varid'>d</span> <span class='conop'>:</span> <span class='chr'>':'</span> <span class='conop'>:</span> <span class='sel'>_more</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-74"></a> <span class='keyglyph'>|</span> <span class='varid'>d</span> <span class='varop'>`elem`</span> <span class='keyglyph'>[</span><span class='chr'>'A'</span><span class='keyglyph'>..</span><span class='chr'>'Z'</span><span class='keyglyph'>]</span> <span class='varop'>||</span> <span class='varid'>d</span> <span class='varop'>`elem`</span> <span class='keyglyph'>[</span><span class='chr'>'a'</span><span class='keyglyph'>..</span><span class='chr'>'z'</span><span class='keyglyph'>]</span>
<a name="line-75"></a> <span class='keyglyph'>=</span> <span class='varid'>file</span>
<a name="line-76"></a> <span class='varid'>fileUriPath</span> <span class='varid'>file</span>
<a name="line-77"></a> <span class='keyglyph'>=</span> <span class='varid'>file</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
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