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

   1 //
   2 // XslIf.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         // also applicable to xsl:when
  41         internal class XslIf : XslCompiledElement {
  42                 CompiledExpression test;
  43                 XslOperation children;
  44
  45                 public XslIf (Compiler c) : base (c) {}
  46
  47                 protected override void Compile (Compiler c)
  48                 {
  49                         c.AssertAttribute ("test");
  50                         c.Input.MoveToFirstAttribute ();
  51                         do {
  52                                 if (c.Input.NamespaceURI != String.Empty)
  53                                         continue;
  54                                 switch (c.Input.LocalName) {
  55                                 case "test":
  56                                         test = c.CompileExpression (c.Input.Value);
  57                                         break;
  58                                 default:
  59                                         throw new XsltCompileException ("Invalid attribute was found: " + c.Input.Name, null, c.Input);
  60                                 }
  61                         } while (c.Input.MoveToNextAttribute ());
  62                         c.Input.MoveToParent ();
  63
  64                         if (!c.Input.MoveToFirstChild ()) return;
  65                         children = c.CompileTemplateContent ();
  66                         c.Input.MoveToParent ();
  67                 }
  68
  69                 public bool EvaluateIfTrue (XslTransformProcessor p)
  70                 {
  71                         if (p.EvaluateBoolean (test)) {
  72                                 if (children != null)
  73                                         children.Evaluate (p);
  74                                 return true;
  75                         }
  76                         return false;
  77                 }
  78
  79                 public override void Evaluate (XslTransformProcessor p)
  80                 {
  81                         EvaluateIfTrue (p);
  82                 }
  83         }
  84 }