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

   1 //
   2 // XslAttribute.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 using System.IO;
  39
  40 using QName = System.Xml.XmlQualifiedName;
  41
  42 namespace Mono.Xml.Xsl.Operations {
  43         internal class XslAttribute : XslCompiledElement {
  44                 XslAvt name, ns;
  45                 string calcName, calcNs, calcPrefix;
  46                 XmlNamespaceManager nsm;
  47
  48                 XslOperation value;
  49                 XPathNavigator nav;
  50
  51                 public XslAttribute (Compiler c) : base (c) {}
  52
  53                 protected override void Compile (Compiler c)
  54                 {
  55                         nav = c.Input.Clone ();
  56
  57                         name = c.ParseAvtAttribute ("name");
  58                         if (name == null)
  59                                 throw new XsltCompileException ("attribute \"name\" is required on XSLT attribute element.", null, c.Input);
  60                         ns = c.ParseAvtAttribute ("namespace");
  61
  62                         calcName = XslAvt.AttemptPreCalc (ref name);
  63                         calcPrefix = String.Empty;
  64
  65                         if (calcName != null) {
  66                                 int colonAt = calcName.IndexOf (':');
  67                                 calcPrefix = colonAt < 0 ? String.Empty : calcName.Substring (0, colonAt);
  68                                 calcName = colonAt < 0 ? calcName : calcName.Substring (colonAt + 1, calcName.Length - colonAt - 1);
  69
  70                                 try {
  71                                         XmlConvert.VerifyNCName (calcName);
  72                                         if (calcPrefix != String.Empty)
  73                                                 XmlConvert.VerifyNCName (calcPrefix);
  74                                 } catch (XmlException ex) {
  75                                         throw new XsltCompileException ("Invalid attribute name.", ex, c.Input);
  76                                 }
  77                         }
  78                         if (calcPrefix != String.Empty && ns == null)
  79                                 calcNs = nav.GetNamespace (calcPrefix);
  80                         else if (ns != null)
  81                                 calcNs = XslAvt.AttemptPreCalc (ref ns);
  82
  83                         if (calcNs ==null && calcPrefix != String.Empty) {
  84                                 string test = c.CurrentStylesheet.PrefixInEffect (calcPrefix, null);
  85                                 if (test != null) {
  86                                         string alias = c.CurrentStylesheet.NamespaceAliases [calcPrefix] as string;
  87                                         if (alias != null)
  88                                                 calcNs = c.Input.GetNamespace (alias);
  89                                         else
  90                                                 calcNs = c.Input.NamespaceURI;
  91                                 }
  92                         }
  93
  94                         if (ns == null && calcNs == null)
  95                                 nsm = c.GetNsm ();
  96
  97                         if (c.Input.MoveToFirstChild ()) {
  98                                 value = c.CompileTemplateContent (XPathNodeType.Attribute);
  99                                 c.Input.MoveToParent ();
 100                         }
 101
 102                 }
 103
 104                 public override void Evaluate (XslTransformProcessor p)
 105                 {
 106                         string nm, nmsp, prefix;
 107
 108                         nm = calcName != null ? calcName : name.Evaluate (p);
 109                         nmsp = calcNs != null ? calcNs : ns != null ? ns.Evaluate (p) : String.Empty;
 110                         prefix = calcPrefix != null ? calcPrefix : String.Empty;
 111
 112                         if (nm == "xmlns")
 113                                 // It is an error. We must recover by not emmiting any attributes
 114                                 // (unless we throw an exception).
 115                                 return;
 116
 117                         int colonAt = nm.IndexOf (':');
 118                         // local attribute
 119                         if (colonAt > 0) {
 120                                 prefix = nm.Substring (0, colonAt);
 121                                 nm = nm.Substring (colonAt + 1, nm.Length - colonAt - 1);
 122
 123                                 // global attribute
 124                                 if (nmsp == null) {
 125                                         QName q = XslNameUtil.FromString (nm, nsm);
 126                                         nm = q.Name;
 127                                         nmsp = q.Namespace;
 128                                 } else
 129                                         nm = XslNameUtil.LocalNameOf (nm);
 130                         }
 131
 132                         if (nmsp != String.Empty && prefix == String.Empty) {
 133                                 if (nav.MoveToFirstNamespace (XPathNamespaceScope.ExcludeXml)) {
 134                                         do {
 135                                                 if (nav.Value == nmsp) {
 136                                                         prefix = nav.Name;
 137                                                         break;
 138                                                 }
 139                                         } while (nav.MoveToNextNamespace (XPathNamespaceScope.ExcludeXml));
 140                                         nav.MoveToParent ();
 141                                 }
 142                         }
 143
 144                         if (prefix == "xmlns")
 145                                 prefix = String.Empty;  // Should not be allowed.
 146
 147                         XmlConvert.VerifyName (nm);
 148
 149                         if (value == null)
 150                                 p.Out.WriteAttributeString(prefix, nm, nmsp, "");
 151                         else {
 152                                 StringWriter sw = new StringWriter ();
 153                                 Outputter outputter = new TextOutputter (sw, true);
 154                                 p.PushOutput (outputter);
 155                                 value.Evaluate (p);
 156                                 p.PopOutput ();
 157                                 outputter.Done ();
 158                                 p.Out.WriteAttributeString (prefix, nm, nmsp, sw.ToString ());
 159                         }
 160                 }
 161         }
 162 }