mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/ChooseAction.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="ChooseAction.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace System.Xml.Xsl.XsltOld {
   9     using Res = System.Xml.Utils.Res;
  10     using System;
  11     using System.Diagnostics;
  12     using System.Xml;
  13     using System.Xml.XPath;
  14
  15     internal class ChooseAction : ContainerAction {
  16         internal override void Compile(Compiler compiler) {
  17             CompileAttributes(compiler);
  18
  19             if (compiler.Recurse()) {
  20                 CompileConditions(compiler);
  21                 compiler.ToParent();
  22             }
  23         }
  24
  25         private void CompileConditions(Compiler compiler) {
  26             NavigatorInput input = compiler.Input;
  27             bool when       = false;
  28             bool otherwise  = false;
  29
  30             do {
  31                 switch (input.NodeType) {
  32                 case XPathNodeType.Element:
  33                     compiler.PushNamespaceScope();
  34                     string nspace = input.NamespaceURI;
  35                     string name   = input.LocalName;
  36
  37                     if (Ref.Equal(nspace, input.Atoms.UriXsl)) {
  38                         IfAction action = null;
  39                         if (Ref.Equal(name, input.Atoms.When)) {
  40                             if (otherwise) {
  41                                 throw XsltException.Create(Res.Xslt_WhenAfterOtherwise);
  42                             }
  43                             action = compiler.CreateIfAction(IfAction.ConditionType.ConditionWhen);
  44                             when = true;
  45                         }
  46                         else if (Ref.Equal(name, input.Atoms.Otherwise)) {
  47                             if (otherwise) {
  48                                 throw XsltException.Create(Res.Xslt_DupOtherwise);
  49                             }
  50                             action = compiler.CreateIfAction(IfAction.ConditionType.ConditionOtherwise);
  51                             otherwise = true;
  52                         }
  53                         else {
  54                             throw compiler.UnexpectedKeyword();
  55                         }
  56                         AddAction(action);
  57                     }
  58                     else {
  59                         throw compiler.UnexpectedKeyword();
  60                     }
  61                     compiler.PopScope();
  62                     break;
  63
  64                 case XPathNodeType.Comment:
  65                 case XPathNodeType.ProcessingInstruction:
  66                 case XPathNodeType.Whitespace:
  67                 case XPathNodeType.SignificantWhitespace:
  68                     break;
  69
  70                 default:
  71                     throw XsltException.Create(Res.Xslt_InvalidContents, "choose");
  72                 }
  73             }
  74             while (compiler.Advance());
  75             if (! when) {
  76                 throw XsltException.Create(Res.Xslt_NoWhen);
  77             }
  78         }
  79     }
  80 }