Filters/FilterXslt.cs

   1 //
   2 // FilterXSLT.cs
   3 //
   4 // Copyright (C) 2006 Alexander Macdonald <alex@alexmac.cc>
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.IO;
  29 using System.Xml;
  30 using System.Text;
  31 using System.Text.RegularExpressions;
  32
  33 using Beagle.Util;
  34 using Beagle.Daemon;
  35
  36 namespace Beagle.Filters
  37 {
  38         public class FilterXslt : Filter
  39         {
  40                 XmlTextReader reader;
  41                 Regex xpath_variables_regex = new Regex ("\\$(?<name>[\\wS][\\wS\\d-:]*)");
  42                 Regex xpath_functions_regex = new Regex ("(?<name>[\\wS][\\wS\\d-:]*)\\(");
  43
  44                 public FilterXslt ()
  45                 {
  46                         AddSupportedFlavor (FilterFlavor.NewFromMimeType ("text/x-xslt"));
  47                         AddSupportedFlavor (FilterFlavor.NewFromMimeType ("application/xslt+xml"));
  48                 }
  49
  50                 override protected void DoPull()
  51                 {
  52                         reader = new XmlTextReader (Stream);
  53                         reader.XmlResolver = null;
  54
  55                         try {
  56                                 while (reader.Read ()) {
  57                                         switch (reader.NodeType) {
  58
  59                                         case XmlNodeType.Element:
  60                                                 HandleElement ();
  61                                                 break;
  62
  63                                         case XmlNodeType.Text:
  64                                                 AppendText (reader.Value.Trim ());
  65                                                 AppendStructuralBreak ();
  66                                                 break;
  67
  68                                         case XmlNodeType.CDATA:
  69                                                 AppendText (reader.Value.Trim ());
  70                                                 AppendStructuralBreak ();
  71                                                 break;
  72
  73                                         case XmlNodeType.Comment:
  74                                                 AppendText (reader.Value.Trim ());
  75                                                 AppendStructuralBreak ();
  76                                                 break;
  77                                         }
  78                                 }
  79                         } catch (System.Xml.XmlException e) {
  80                                 Logger.Log.Warn ("FilterXslt: error parsing xml file: {0}", e);
  81                                 Error ();
  82                                 return;
  83                         }
  84
  85                         Finished ();
  86                 }
  87
  88                 protected void HandleElement()
  89                 {
  90                         for (int i = 0; i < reader.AttributeCount; i++) {
  91                                 reader.MoveToAttribute (i);
  92
  93                                 switch (reader.LocalName) {
  94
  95                                 case "name":
  96                                         AppendText (reader.Value);
  97                                         AppendStructuralBreak ();
  98                                         break;
  99
 100                                 case "select":
 101                                         foreach (Match m in xpath_variables_regex.Matches (reader.Value)) {
 102                                                 AppendText (m.Groups ["name"].Value);
 103                                                 AppendStructuralBreak ();
 104                                         }
 105
 106                                         foreach (Match m in xpath_functions_regex.Matches (reader.Value)) {
 107                                                 AppendText (m.Groups ["name"].Value);
 108                                                 AppendStructuralBreak ();
 109                                         }
 110
 111                                         break;
 112                                 }
 113                         }
 114
 115                         reader.MoveToElement ();
 116                 }
 117         }
 118 }