mcs/class/System.XML/Mono.Xml.XPath/Pattern.cs

   1 //
   2 // Mono.Xml.XPath.Pattern
   3 //
   4 // Author:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //
   7 // (C) 2003 Ben Maurer
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Collections;
  33 using System.IO;
  34 using System.Xml;
  35 using System.Xml.Schema;
  36 using System.Xml.XPath;
  37 using System.Xml.Xsl;
  38 using Mono.Xml.Xsl;
  39
  40 namespace Mono.Xml.XPath
  41 {
  42         internal abstract class Pattern
  43         {
  44                 internal static Pattern Compile (string s, Compiler comp)
  45                 {
  46                         return Compile (comp.patternParser.Compile (s));
  47                 }
  48
  49                 internal static Pattern Compile (Expression e)
  50                 {
  51                         if (e is ExprUNION)
  52                                 return new UnionPattern (
  53                                         Compile (((ExprUNION)e).left),
  54                                         Compile (((ExprUNION)e).right)
  55                                 );
  56
  57                         if (e is ExprRoot)
  58                                 return new LocationPathPattern (
  59                                         new NodeTypeTest (Axes.Self, XPathNodeType.Root)
  60                                 );
  61
  62                         if (e is NodeTest)
  63                                 return new LocationPathPattern (
  64                                         (NodeTest)e
  65                                 );
  66
  67                         if (e is ExprFilter)
  68                                 return new LocationPathPattern (
  69                                         (ExprFilter)e
  70                                 );
  71
  72                         if (e is ExprSLASH)
  73                         {
  74                                 Pattern p0 = Compile (((ExprSLASH)e).left);
  75                                 LocationPathPattern p1
  76                                         = (LocationPathPattern)Compile (((ExprSLASH)e).right);
  77
  78                                 p1.SetPreviousPattern (p0, false);
  79                                 return p1;
  80                         }
  81
  82                         if (e is ExprSLASH2)
  83                         {
  84                                 if (((ExprSLASH2)e).left is ExprRoot)
  85                                         return Compile (((ExprSLASH2)e).right);
  86
  87                                 Pattern p0 = Compile (((ExprSLASH2)e).left);
  88                                 LocationPathPattern p1
  89                                         = (LocationPathPattern)Compile (((ExprSLASH2)e).right);
  90
  91                                 p1.SetPreviousPattern (p0, true);
  92                                 return p1;
  93                         }
  94
  95                         if (e is XPathFunctionId)
  96                         {
  97                                 ExprLiteral id = ((XPathFunctionId) e).Id as ExprLiteral;
  98                                 return new IdPattern (id.Value);
  99                         }
 100
 101                         if (e is XsltKey)
 102                         {
 103                                 return new KeyPattern ((XsltKey) e);
 104                         }
 105
 106                         return null; // throw Exception outer this method.
 107                 }
 108
 109                 public virtual double DefaultPriority { get { return 0.5; }}
 110
 111                 public virtual XPathNodeType EvaluatedNodeType {
 112                         get { return XPathNodeType.All; }
 113                 }
 114
 115                 public abstract bool Matches (XPathNavigator node, XsltContext ctx);
 116         }
 117 }