class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/ConditionRelationalExpression.cs

   1 //
   2 // ConditionRelationalExpression.cs
   3 //
   4 // Author:
   5 //   Marek Sieradzki (marek.sieradzki@gmail.com)
   6 //
   7 // (C) 2006 Marek Sieradzki
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27
  28 #if NET_2_0
  29
  30 using System;
  31 using System.Collections;
  32 using System.Xml;
  33
  34 namespace Microsoft.Build.BuildEngine {
  35         internal sealed class ConditionRelationalExpression : ConditionExpression {
  36
  37                 readonly ConditionExpression left;
  38                 readonly ConditionExpression right;
  39                 readonly RelationOperator op;
  40
  41                 public ConditionRelationalExpression (ConditionExpression left,
  42                                                       ConditionExpression right,
  43                                                       RelationOperator op)
  44                 {
  45                         this.left = left;
  46                         this.right = right;
  47                         this.op = op;
  48                 }
  49
  50                 public override  bool BoolEvaluate (Project context)
  51                 {
  52                         if (left.CanEvaluateToNumber (context) && right.CanEvaluateToNumber (context)) {
  53                                 float l,r;
  54
  55                                 l = left.NumberEvaluate (context);
  56                                 r = right.NumberEvaluate (context);
  57
  58                                 return NumberCompare (l, r, op);
  59                         } else if (left.CanEvaluateToBool (context) && right.CanEvaluateToBool (context)) {
  60                                 bool l,r;
  61
  62                                 l = left.BoolEvaluate (context);
  63                                 r = right.BoolEvaluate (context);
  64
  65                                 return BoolCompare (l, r, op);
  66                         } else {
  67                                 string l,r;
  68
  69                                 l = left.StringEvaluate (context);
  70                                 r = right.StringEvaluate (context);
  71
  72                                 return StringCompare (l, r, op);
  73                         }
  74                 }
  75
  76                 public override float NumberEvaluate (Project context)
  77                 {
  78                         throw new NotSupportedException ();
  79                 }
  80
  81                 public override string StringEvaluate (Project context)
  82                 {
  83                         throw new NotSupportedException ();
  84                 }
  85
  86                 // FIXME: check if we really can do it
  87                 public override bool CanEvaluateToBool (Project context)
  88                 {
  89                         return true;
  90                 }
  91
  92                 public override bool CanEvaluateToNumber (Project context)
  93                 {
  94                         return false;
  95                 }
  96
  97                 public override bool CanEvaluateToString (Project context)
  98                 {
  99                         return false;
 100                 }
 101
 102                 static bool NumberCompare (float l,
 103                                            float r,
 104                                            RelationOperator op)
 105                 {
 106                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 107
 108                         switch (op) {
 109                         case RelationOperator.Equal:
 110                                 return comparer.Compare (l, r) == 0;
 111                         case RelationOperator.NotEqual:
 112                                 return comparer.Compare (l, r) != 0;
 113                         case RelationOperator.Greater:
 114                                 return comparer.Compare (l, r) > 0;
 115                         case RelationOperator.GreaterOrEqual:
 116                                 return comparer.Compare (l, r) >= 0;
 117                         case RelationOperator.Less:
 118                                 return comparer.Compare (l, r) < 0;
 119                         case RelationOperator.LessOrEqual:
 120                                 return comparer.Compare (l, r) <= 0;
 121                         default:
 122                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 123                         }
 124                 }
 125
 126                 static bool BoolCompare (bool l,
 127                                          bool r,
 128                                          RelationOperator op)
 129                 {
 130                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 131
 132                         switch (op) {
 133                         case RelationOperator.Equal:
 134                                 return comparer.Compare (l, r) == 0;
 135                         case RelationOperator.NotEqual:
 136                                 return comparer.Compare (l, r) != 0;
 137                         default:
 138                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 139                         }
 140                 }
 141
 142                 static bool StringCompare (string l,
 143                                            string r,
 144                                            RelationOperator op)
 145                 {
 146                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 147
 148                         switch (op) {
 149                         case RelationOperator.Equal:
 150                                 return comparer.Compare (l, r) == 0;
 151                         case RelationOperator.NotEqual:
 152                                 return comparer.Compare (l, r) != 0;
 153                         default:
 154                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 155                         }
 156                 }
 157         }
 158
 159         internal enum RelationOperator {
 160                 Equal,
 161                 NotEqual,
 162                 Less,
 163                 Greater,
 164                 LessOrEqual,
 165                 GreaterOrEqual
 166         }
 167 }
 168
 169 #endif