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

   1 //
   2 // ConditionFactorExpression.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.Collections.Specialized;
  33 using System.Globalization;
  34 using System.Xml;
  35
  36 namespace Microsoft.Build.BuildEngine {
  37         internal sealed class ConditionFactorExpression : ConditionExpression {
  38
  39                 readonly Token token;
  40
  41                 static Hashtable allValues;
  42                 static Hashtable trueValues;
  43                 static Hashtable falseValues;
  44
  45                 static ConditionFactorExpression ()
  46                 {
  47                         string[] trueValuesArray = new string[] {"true", "on", "yes"};
  48                         string[] falseValuesArray = new string[] {"false", "off", "no"};
  49
  50
  51                         allValues = CollectionsUtil.CreateCaseInsensitiveHashtable ();
  52                         trueValues = CollectionsUtil.CreateCaseInsensitiveHashtable ();
  53                         falseValues = CollectionsUtil.CreateCaseInsensitiveHashtable ();
  54
  55                         foreach (string s in trueValuesArray) {
  56                                 trueValues.Add (s, s);
  57                                 allValues.Add (s, s);
  58                         }
  59
  60                         foreach (string s in falseValuesArray) {
  61                                 falseValues.Add (s, s);
  62                                 allValues.Add (s, s);
  63                         }
  64                 }
  65
  66                 public ConditionFactorExpression (Token token)
  67                 {
  68                         this.token = token;
  69                 }
  70
  71                 public override bool BoolEvaluate (Project context)
  72                 {
  73                         Token evaluatedToken = EvaluateToken (token, context);
  74
  75                         if (trueValues [evaluatedToken.Value] != null)
  76                                 return true;
  77                         else if (falseValues [evaluatedToken.Value] != null)
  78                                 return false;
  79                         else
  80                                 throw new InvalidProjectFileException ();
  81                 }
  82
  83                 public override float NumberEvaluate (Project context)
  84                 {
  85                         Token evaluatedToken = EvaluateToken (token, context);
  86
  87                         return Single.Parse (evaluatedToken.Value, CultureInfo.InvariantCulture);
  88                 }
  89
  90                 public override string StringEvaluate (Project context)
  91                 {
  92                         Token evaluatedToken = EvaluateToken (token, context);
  93
  94                         return evaluatedToken.Value;
  95                 }
  96
  97                 // FIXME: check if we really can do it
  98                 public override bool CanEvaluateToBool (Project context)
  99                 {
 100                         Token evaluatedToken = EvaluateToken (token, context);
 101
 102                         if (token.Type == TokenType.String && allValues [evaluatedToken.Value] != null)
 103                                 return true;
 104                         else
 105                                 return false;
 106                 }
 107
 108                 public override bool CanEvaluateToNumber (Project context)
 109                 {
 110                         if (token.Type == TokenType.Number)
 111                                 return true;
 112                         else
 113                                 return false;
 114                 }
 115
 116                 public override bool CanEvaluateToString (Project context)
 117                 {
 118                         return true;
 119                 }
 120
 121                 // FIXME: in some situations items might not be allowed
 122                 static Token EvaluateToken (Token token, Project context)
 123                 {
 124                         Expression oe = new Expression ();
 125                         oe.Parse (token.Value, ParseOptions.AllowItemsMetadataAndSplit);
 126                         return new Token ((string) oe.ConvertTo (context, typeof (string)), token.Type);
 127                 }
 128         }
 129 }
 130
 131 #endif