mcs/class/System.Xml.Linq/System.Xml.Linq/XUtil.cs

   1 //
   2 // Authors:
   3 //   Atsushi Enomoto
   4 //
   5 // Copyright 2007 Novell (http://www.novell.com)
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining
   8 // a copy of this software and associated documentation files (the
   9 // "Software"), to deal in the Software without restriction, including
  10 // without limitation the rights to use, copy, modify, merge, publish,
  11 // distribute, sublicense, and/or sell copies of the Software, and to
  12 // permit persons to whom the Software is furnished to do so, subject to
  13 // the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be
  16 // included in all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Collections;
  29 using System.Collections.Generic;
  30 using System.IO;
  31 using System.Text;
  32 using System.Xml;
  33
  34 using XPI = System.Xml.Linq.XProcessingInstruction;
  35
  36 namespace System.Xml.Linq
  37 {
  38         internal static class XUtil
  39         {
  40                 public const string XmlnsNamespace =
  41                         "http://www.w3.org/2000/xmlns/";
  42
  43                 // FIXME: implement
  44                 public static string ToString (object o)
  45                 {
  46                         if (o == null)
  47                                 throw new InvalidOperationException ("Attempt to get string from null");
  48                         if (o is string)
  49                                 return (string) o;
  50                         return o.ToString ();
  51                 }
  52
  53                 public static bool ToBoolean (object o)
  54                 {
  55                         throw new NotImplementedException ();
  56                 }
  57
  58                 public static Nullable <bool> ToNullableBoolean (object o)
  59                 {
  60                         throw new NotImplementedException ();
  61                 }
  62
  63                 // FIXME: this method is not enough by design.
  64                 public static XNode ToNode (object o)
  65                 {
  66                         XNode n = o as XNode;
  67                         if (n != null)
  68                                 return n;
  69                         if (o is string)
  70                                 return new XText ((string) o);
  71                         if (o is IEnumerable)
  72                                 throw new NotImplementedException ();
  73                         return new XText (o.ToString ());
  74                 }
  75
  76                 public static object Clone (object o)
  77
  78                 {
  79                         if (o is string)
  80                                 return (string) o;
  81                         if (o is XElement)
  82                                 return new XElement ((XElement) o);
  83                         if (o is XCData)
  84                                 return new XCData (((XCData) o).Value);
  85                         if (o is XComment)
  86                                 return new XComment (((XComment) o).Value);
  87                         XPI pi = o as XPI;
  88                         if (pi != null)
  89                                 return new XPI (pi.Target, pi.Data);
  90                         XDeclaration xd = o as XDeclaration;
  91                         if (xd != null)
  92                                 return new XDeclaration (xd.Version, xd.Encoding, xd.Standalone);
  93                         XDocumentType dtd = o as XDocumentType;
  94                         if (dtd != null)
  95                                 throw new NotImplementedException ();
  96                         throw new ArgumentException ();
  97                 }
  98
  99                 public static IEnumerable<object> ShrinkArray (params object [] content)
 100                 {
 101                         if (content == null || content.Length == 0)
 102                                 yield break;
 103                         string prev = null;
 104                         foreach (object o in content) {
 105                                 if (o is XNode) {
 106                                         if (prev != null) {
 107                                                 yield return prev;
 108                                                 prev = null;
 109                                         }
 110                                         yield return o;
 111                                 } else {
 112                                         prev += o;
 113                                 }
 114                         }
 115                         if (prev != null)
 116                                 yield return prev;
 117                 }
 118         }
 119 }