mcs/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 using System;
  29 using System.Collections;
  30 using System.Xml;
  31
  32 namespace Microsoft.Build.BuildEngine {
  33         internal sealed class ConditionRelationalExpression : ConditionExpression {
  34
  35                 readonly ConditionExpression left;
  36                 readonly ConditionExpression right;
  37                 readonly RelationOperator op;
  38
  39                 public ConditionRelationalExpression (ConditionExpression left,
  40                                                       ConditionExpression right,
  41                                                       RelationOperator op)
  42                 {
  43                         this.left = left;
  44                         this.right = right;
  45                         this.op = op;
  46                 }
  47
  48                 public override  bool BoolEvaluate (Project context)
  49                 {
  50                         if (left.CanEvaluateToNumber (context) && right.CanEvaluateToNumber (context)) {
  51                                 float l,r;
  52
  53                                 l = left.NumberEvaluate (context);
  54                                 r = right.NumberEvaluate (context);
  55
  56                                 return NumberCompare (l, r, op);
  57                         } else if (left.CanEvaluateToBool (context) && right.CanEvaluateToBool (context)) {
  58                                 bool l,r;
  59
  60                                 l = left.BoolEvaluate (context);
  61                                 r = right.BoolEvaluate (context);
  62
  63                                 return BoolCompare (l, r, op);
  64                         } else {
  65                                 string l,r;
  66
  67                                 l = left.StringEvaluate (context);
  68                                 r = right.StringEvaluate (context);
  69
  70                                 return StringCompare (l, r, op);
  71                         }
  72                 }
  73
  74                 public override float NumberEvaluate (Project context)
  75                 {
  76                         throw new NotSupportedException ();
  77                 }
  78
  79                 public override string StringEvaluate (Project context)
  80                 {
  81                         throw new NotSupportedException ();
  82                 }
  83
  84                 // FIXME: check if we really can do it
  85                 public override bool CanEvaluateToBool (Project context)
  86                 {
  87                         return true;
  88                 }
  89
  90                 public override bool CanEvaluateToNumber (Project context)
  91                 {
  92                         return false;
  93                 }
  94
  95                 public override bool CanEvaluateToString (Project context)
  96                 {
  97                         return false;
  98                 }
  99
 100                 static bool NumberCompare (float l,
 101                                            float r,
 102                                            RelationOperator op)
 103                 {
 104                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 105
 106                         switch (op) {
 107                         case RelationOperator.Equal:
 108                                 return comparer.Compare (l, r) == 0;
 109                         case RelationOperator.NotEqual:
 110                                 return comparer.Compare (l, r) != 0;
 111                         case RelationOperator.Greater:
 112                                 return comparer.Compare (l, r) > 0;
 113                         case RelationOperator.GreaterOrEqual:
 114                                 return comparer.Compare (l, r) >= 0;
 115                         case RelationOperator.Less:
 116                                 return comparer.Compare (l, r) < 0;
 117                         case RelationOperator.LessOrEqual:
 118                                 return comparer.Compare (l, r) <= 0;
 119                         default:
 120                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 121                         }
 122                 }
 123
 124                 static bool BoolCompare (bool l,
 125                                          bool r,
 126                                          RelationOperator op)
 127                 {
 128                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 129
 130                         switch (op) {
 131                         case RelationOperator.Equal:
 132                                 return comparer.Compare (l, r) == 0;
 133                         case RelationOperator.NotEqual:
 134                                 return comparer.Compare (l, r) != 0;
 135                         default:
 136                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 137                         }
 138                 }
 139
 140                 static bool StringCompare (string l,
 141                                            string r,
 142                                            RelationOperator op)
 143                 {
 144                         IComparer comparer = CaseInsensitiveComparer.DefaultInvariant;
 145
 146                         switch (op) {
 147                         case RelationOperator.Equal:
 148                                 return comparer.Compare (l, r) == 0;
 149                         case RelationOperator.NotEqual:
 150                                 return comparer.Compare (l, r) != 0;
 151                         default:
 152                                 throw new NotSupportedException (String.Format ("Relational operator {0} is not supported.", op));
 153                         }
 154                 }
 155         }
 156
 157         internal enum RelationOperator {
 158                 Equal,
 159                 NotEqual,
 160                 Less,
 161                 Greater,
 162                 LessOrEqual,
 163                 GreaterOrEqual
 164         }
 165 }