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

   1 //
   2 // XslElement.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 using System;
  13 using System.Collections;
  14 using System.Xml;
  15 using System.Xml.XPath;
  16 using System.Xml.Xsl;
  17
  18 using QName = System.Xml.XmlQualifiedName;
  19
  20 namespace Mono.Xml.Xsl.Operations {
  21         public class XslElement : XslCompiledElement {
  22                 XslAvt name, ns;
  23                 string calcName, calcNs, calcPrefix;
  24                 XmlNamespaceManager nsm;
  25                 bool isEmptyElement;
  26
  27                 XslOperation value;
  28                 XmlQualifiedName [] useAttributeSets;
  29
  30                 XPathNavigator nav;
  31
  32                 public XslElement (Compiler c) : base (c) {}
  33                 protected override void Compile (Compiler c)
  34                 {
  35                         nav = c.Input.Clone ();
  36
  37                         name = c.ParseAvtAttribute ("name");
  38                         ns = c.ParseAvtAttribute ("namespace");
  39
  40                         calcName = XslAvt.AttemptPreCalc (ref name);
  41
  42                         if (calcName != null && ns == null) {
  43                                 int colonAt = calcName.IndexOf (':');
  44                                 calcPrefix = colonAt < 0 ? String.Empty : calcName.Substring (0, colonAt);
  45                                 calcName = colonAt < 0 ? calcName : calcName.Substring (colonAt + 1, calcName.Length - colonAt - 1);
  46                                 calcNs = c.Input.GetNamespace (calcPrefix);
  47                         } else if (ns != null)
  48                                 calcNs = XslAvt.AttemptPreCalc (ref ns);
  49
  50                         if (ns == null && calcNs == null)
  51                                 nsm = c.GetNsm ();
  52
  53                         useAttributeSets = c.ParseQNameListAttribute ("use-attribute-sets");
  54
  55                         isEmptyElement = c.Input.IsEmptyElement;
  56
  57                         if (c.Input.MoveToFirstChild ()) {
  58                                 value = c.CompileTemplateContent ();
  59                                 c.Input.MoveToParent ();
  60                         }
  61                 }
  62
  63                 public override void Evaluate (XslTransformProcessor p)
  64                 {
  65                         string nm, nmsp, localName, prefix;
  66
  67                         localName = nm = calcName != null ? calcName : name.Evaluate (p);
  68                         nmsp = calcNs != null ? calcNs : ns != null ? ns.Evaluate (p) : null;
  69
  70                         if (nmsp == null) {
  71                                 QName q = XslNameUtil.FromString (nm, nsm);
  72                                 localName = q.Name;
  73                                 nmsp = q.Namespace;
  74                                 int colonAt = nm.IndexOf (':');
  75                                 if (colonAt > 0)
  76                                         calcPrefix = nm.Substring (0, colonAt);
  77                         }
  78                         prefix = calcPrefix != null ? calcPrefix : String.Empty;
  79
  80                         if (calcPrefix == String.Empty) {
  81                                 if (nav.MoveToFirstNamespace (XPathNamespaceScope.ExcludeXml)) {
  82                                         do {
  83                                                 if (nav.Value == nmsp) {
  84                                                         prefix = nav.Name;
  85                                                         break;
  86                                                 }
  87                                         } while (nav.MoveToNextNamespace (XPathNamespaceScope.ExcludeXml));
  88                                         nav.MoveToParent ();
  89                                 }
  90                         }
  91
  92                         XmlConvert.VerifyName (nm);
  93
  94                         bool cdataStarted = false;
  95                         if (!p.InsideCDataElement && p.PushCDataState (localName, nmsp))
  96                                 cdataStarted = true;
  97                         p.Out.WriteStartElement (prefix, localName, nmsp);
  98                         p.TryStylesheetNamespaceOutput (null);
  99
 100                         if (useAttributeSets != null)
 101                                 foreach (XmlQualifiedName s in useAttributeSets)
 102                                         p.ResolveAttributeSet (s).Evaluate (p);
 103
 104                         if (value != null) value.Evaluate (p);
 105
 106                         if (isEmptyElement && useAttributeSets == null)
 107                                 p.Out.WriteEndElement ();
 108                         else
 109                                 p.Out.WriteFullEndElement ();
 110                         if (cdataStarted)
 111                                 p.PopCDataState ();
 112                 }
 113         }
 114 }