tools/dtd2rng/dtd2rng.cs

   1 using System;
   2 using System.Reflection;
   3 using System.Xml;
   4 using System.Xml.Schema;
   5 using Commons.Xml.Relaxng;
   6 using Commons.Xml.Relaxng.Rnc;
   7
   8 using BF = System.Reflection.BindingFlags;
   9
  10 namespace Mono.XmlTools
  11 {
  12         public class Dtd2Rng
  13         {
  14                 public static int Main (string [] args)
  15                 {
  16                         if (args.Length == 0) {
  17                                 Usage ();
  18                                 return 1;
  19                         }
  20
  21                         return new Dtd2Rng ().Process (args);
  22                 }
  23
  24                 static void Usage ()
  25                 {
  26                         Console.Error.WriteLine (@"
  27 Usage dtd2rng [options] dtdfile [ns]
  28
  29 options:
  30         --help : show this message.
  31         --compact, -c : output compact syntax.
  32 ");
  33                 }
  34
  35                 public int Process (string [] args)
  36                 {
  37                         string file = null;
  38                         bool compact = false;
  39                         string ns = String.Empty;
  40                         foreach (string arg in args) {
  41                                 if (arg == "--help") {
  42                                         Usage ();
  43                                         return 1;
  44                                 }
  45                                 if (arg == "--compact" || arg == "-c")
  46                                         compact = true;
  47                                 else if (file == null)
  48                                         file = arg;
  49                                 else if (ns != String.Empty) {
  50                                         Usage ();
  51                                         Console.Error.WriteLine ("Extra command line argument.");
  52                                         return 1;
  53                                 }
  54                                 else
  55                                         ns = arg;
  56                         }
  57
  58                         XmlTextReader xtr;
  59                         if (file.EndsWith (".dtd")) {
  60                                 xtr = new XmlTextReader (
  61                                         "<!DOCTYPE dummy SYSTEM '" + file + "'>",
  62                                         XmlNodeType.Document, null);
  63                         } else {
  64                                 xtr = new XmlTextReader (file);
  65                         }
  66                         xtr.Read ();
  67                         if (xtr.NodeType == XmlNodeType.XmlDeclaration)
  68                                 xtr.Read ();
  69
  70                         XmlSchema xsd = GetXmlSchema (xtr);
  71
  72                         RelaxngPattern rng = DtdXsd2Rng (xsd, ns);
  73                         if (compact)
  74                                 rng.WriteCompact (Console.Out);
  75                         else {
  76                                 XmlTextWriter w = new XmlTextWriter (Console.Out);
  77                                 w.Formatting = Formatting.Indented;
  78                                 rng.Write (w);
  79                                 w.Close ();
  80                         }
  81                         return 0;
  82                 }
  83
  84                 XmlSchema GetXmlSchema (XmlTextReader xtr)
  85                 {
  86                         // Hacky reflection part
  87                         object impl = xtr;
  88                         BF flag = BF.NonPublic | BF.Instance;
  89
  90                         // In Mono NET_2_0 XmlTextReader is just a wrapper which
  91                         // does not contain DTD directly.
  92                         FieldInfo fi = typeof (XmlTextReader).GetField ("source", flag);
  93                         if (fi != null)
  94                                 impl = fi.GetValue (xtr);
  95
  96                         PropertyInfo pi = impl.GetType ().GetProperty ("DTD", flag);
  97                         object dtd = pi.GetValue (impl, null);
  98                         MethodInfo mi =
  99                                 dtd.GetType ().GetMethod ("CreateXsdSchema", flag);
 100                         object o = mi.Invoke (dtd, null);
 101                         return (XmlSchema) o;
 102                 }
 103
 104                 RelaxngGrammar g;
 105
 106                 RelaxngGrammar DtdXsd2Rng (XmlSchema xsd, string ns)
 107                 {
 108                         g = new RelaxngGrammar ();
 109                         g.DefaultNamespace = ns;
 110                         RelaxngStart start = new RelaxngStart ();
 111                         g.Starts.Add (start);
 112                         RelaxngChoice choice = new RelaxngChoice ();
 113                         start.Pattern = choice;
 114
 115                         // There are only elements.
 116                         foreach (XmlSchemaElement el in xsd.Items) {
 117                                 RelaxngDefine def = DefineElement (el);
 118                                 g.Defines.Add (def);
 119                                 RelaxngRef dref = new RelaxngRef ();
 120                                 dref.Name = def.Name;
 121                                 choice.Patterns.Add (dref);
 122                         }
 123
 124                         return g;
 125                 }
 126
 127                 RelaxngDefine DefineElement (XmlSchemaElement el)
 128                 {
 129                         RelaxngDefine def = new RelaxngDefine ();
 130                         def.Patterns.Add (CreateElement (el));
 131                         def.Name = el.Name;
 132
 133                         return def;
 134                 }
 135
 136                 RelaxngPattern CreateElement (XmlSchemaElement xse)
 137                 {
 138                         if (xse.RefName != XmlQualifiedName.Empty) {
 139                                 RelaxngRef r = new RelaxngRef ();
 140                                 r.Name = xse.RefName.Name;
 141                                 // namespace means nothing here.
 142                                 return r;
 143                         }
 144
 145                         RelaxngElement re = new RelaxngElement ();
 146                         RelaxngName name = new RelaxngName ();
 147                         name.LocalName = xse.Name;
 148                         re.NameClass = name;
 149
 150                         XmlSchemaComplexType ct = xse.SchemaType as XmlSchemaComplexType;
 151
 152                         foreach (XmlSchemaAttribute a in ct.Attributes)
 153                                 re.Patterns.Add (CreateAttribute (a));
 154
 155                         RelaxngPattern rpart;
 156                         if (ct.Particle == null)
 157                                 rpart = new RelaxngEmpty ();
 158                         else
 159                                 rpart = CreatePatternFromParticle (ct.Particle);
 160
 161                         if (ct.IsMixed) {
 162                                 if (rpart.PatternType != RelaxngPatternType.Empty) {
 163                                         RelaxngMixed mixed = new RelaxngMixed ();
 164                                         mixed.Patterns.Add (rpart);
 165                                         rpart = mixed;
 166                                 } else {
 167                                         rpart = new RelaxngText ();
 168                                 }
 169                         }
 170
 171                         re.Patterns.Add (rpart);
 172
 173                         return re;
 174                 }
 175
 176                 RelaxngPattern CreateAttribute (XmlSchemaAttribute attr)
 177                 {
 178                         RelaxngAttribute ra = new RelaxngAttribute ();
 179                         RelaxngName name = new RelaxngName ();
 180                         name.LocalName = attr.Name;
 181                         ra.NameClass = name;
 182                         ra.Pattern = attr.SchemaType != null ?
 183                                 CreatePatternFromType (attr.SchemaType) :
 184                                 CreatePatternFromTypeName (attr.SchemaTypeName);
 185
 186                         RelaxngPattern ret = ra;
 187
 188                         if (attr.Use == XmlSchemaUse.Optional) {
 189                                 RelaxngOptional opt = new RelaxngOptional ();
 190                                 opt.Patterns.Add (ra);
 191                                 ret = opt;
 192                         }
 193                         return ret;
 194                 }
 195
 196                 RelaxngPattern CreatePatternFromParticle (XmlSchemaParticle xsdp)
 197                 {
 198                         RelaxngSingleContentPattern rngp = null;
 199                         if (xsdp.MinOccurs == 0 && xsdp.MaxOccursString == "unbounded")
 200                                 rngp = new RelaxngZeroOrMore ();
 201                         else if (xsdp.MinOccurs == 1 && xsdp.MaxOccursString == "unbounded")
 202                                 rngp = new RelaxngOneOrMore ();
 203                         else if (xsdp.MinOccurs == 0)
 204                                 rngp = new RelaxngOptional ();
 205
 206                         RelaxngPattern child = CreatePatternFromParticleCore (xsdp);
 207                         if (rngp == null)
 208                                 return child;
 209                         rngp.Patterns.Add (child);
 210                         return rngp;
 211                 }
 212
 213                 RelaxngPattern CreatePatternFromParticleCore (XmlSchemaParticle xsdp)
 214                 {
 215                         XmlSchemaGroupBase gb = xsdp as XmlSchemaGroupBase;
 216                         if (xsdp is XmlSchemaAny) {
 217                                 RelaxngRef r = new RelaxngRef ();
 218                                 r.Name = "anyType";
 219                                 return r;
 220                         }
 221                         if (gb is XmlSchemaSequence) {
 222                                 RelaxngGroup grp = new RelaxngGroup ();
 223                                 foreach (XmlSchemaParticle xsdc in gb.Items)
 224                                         grp.Patterns.Add (CreatePatternFromParticle (xsdc));
 225                                 return grp;
 226                         }
 227                         if (gb is XmlSchemaChoice) {
 228                                 RelaxngChoice rc = new RelaxngChoice ();
 229                                 foreach (XmlSchemaParticle xsdc in gb.Items)
 230                                         rc.Patterns.Add (CreatePatternFromParticle (xsdc));
 231                                 return rc;
 232                         }
 233                         return CreateElement ((XmlSchemaElement) xsdp);
 234                 }
 235
 236                 RelaxngPattern CreatePatternFromType (XmlSchemaType type)
 237                 {
 238                         XmlSchemaSimpleType st = type as XmlSchemaSimpleType;
 239                         if (st == null)
 240                                 throw new NotSupportedException ("Complex types are not supported as an attribute type.");
 241                         XmlSchemaSimpleTypeRestriction r =
 242                                 st.Content as XmlSchemaSimpleTypeRestriction;
 243                         if (r == null)
 244                                 throw new NotSupportedException ("Only simple type restriction is supported as an attribute type.");
 245
 246                         RelaxngChoice c = new RelaxngChoice ();
 247                         foreach (XmlSchemaFacet f in r.Facets) {
 248                                 XmlSchemaEnumerationFacet en =
 249                                         f as XmlSchemaEnumerationFacet;
 250                                 if (en == null)
 251                                         throw new NotSupportedException ("Only enumeration facet is supported.");
 252                                 RelaxngValue v = new RelaxngValue ();
 253                                 v.Type = r.BaseTypeName.Name;
 254                                 v.DatatypeLibrary = RemapDatatypeLibrary (
 255                                         r.BaseTypeName.Namespace);
 256                                 v.Value = en.Value;
 257                                 c.Patterns.Add (v);
 258                         }
 259                         return c;
 260                 }
 261
 262                 RelaxngPattern CreatePatternFromTypeName (XmlQualifiedName name)
 263                 {
 264                         if (name == XmlQualifiedName.Empty)
 265                                 return new RelaxngText ();
 266                         RelaxngData data = new RelaxngData ();
 267                         data.Type = name.Name;
 268                         data.DatatypeLibrary = RemapDatatypeLibrary (
 269                                 name.Namespace);
 270                         return data;
 271                 }
 272
 273                 string RemapDatatypeLibrary (string ns)
 274                 {
 275                         return ns == XmlSchema.Namespace ?
 276                                 "http://www.w3.org/2001/XMLSchema-datatypes" :
 277                                 ns;
 278                 }
 279         }
 280 }