mcs/class/System.XML/Mono.Xml.Xsl.Operations/XslChoose.cs

   1 //
   2 // XslChoose.cs
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   7 //
   8 // (C) 2003 Ben Maurer
   9 // (C) 2003 Atsushi Enomoto
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Collections;
  35 using System.Xml;
  36 using System.Xml.XPath;
  37 using System.Xml.Xsl;
  38
  39 namespace Mono.Xml.Xsl.Operations {
  40         internal class XslChoose : XslCompiledElement {
  41                 XslOperation defaultChoice = null;
  42                 ArrayList conditions = new ArrayList ();
  43
  44                 public XslChoose (Compiler c) : base (c) {}
  45
  46                 protected override void Compile (Compiler c)
  47                 {
  48                         if (!c.Input.MoveToFirstChild ())
  49                                 throw new XsltCompileException ("Expecting non-empty element", null, c.Input);
  50
  51                         do {
  52                                 if (c.Input.NodeType != XPathNodeType.Element) continue;
  53                                 if (c.Input.NamespaceURI != XsltNamespace) continue;
  54
  55                                 if (defaultChoice != null)
  56                                         throw new XsltCompileException ("otherwise attribute must be last", null, c.Input);
  57
  58                                 switch (c.Input.LocalName) {
  59                                 case "when":
  60                                         conditions.Add (new XslIf (c));
  61                                         break;
  62
  63                                 case "otherwise":
  64                                         if (c.Input.MoveToFirstChild ()) {
  65                                                 defaultChoice = c.CompileTemplateContent ();
  66                                                 c.Input.MoveToParent ();
  67                                         }
  68                                         break;
  69
  70                                 default:
  71                                         if (c.CurrentStylesheet.Version == "1.0")
  72                                                 throw new XsltCompileException ("XSLT choose element accepts only when and otherwise elements", null, c.Input);
  73                                         break;
  74                                 }
  75                         } while (c.Input.MoveToNext ());
  76
  77                         c.Input.MoveToParent ();
  78
  79                         if (conditions.Count == 0)
  80                                 throw new XsltCompileException ("Choose must have 1 or ore when elements", null, c.Input);
  81                 }
  82
  83                 public override void Evaluate (XslTransformProcessor p)
  84                 {
  85                         int len = conditions.Count;
  86                         for (int i = 0; i < len; i++) {
  87                                 if (((XslIf)conditions [i]).EvaluateIfTrue (p))
  88                                         return;
  89                         }
  90
  91                         if (defaultChoice != null)
  92                                 defaultChoice.Evaluate (p);
  93                 }
  94
  95         }
  96 }