1 // ***********************************************************************
2 // Copyright (c) 2008 Charlie Poole
4 // Permission is hereby granted, free of charge, to any person obtaining
5 // a copy of this software and associated documentation files (the
6 // "Software"), to deal in the Software without restriction, including
7 // without limitation the rights to use, copy, modify, merge, publish,
8 // distribute, sublicense, and/or sell copies of the Software, and to
9 // permit persons to whom the Software is furnished to do so, subject to
10 // the following conditions:
12 // The above copyright notice and this permission notice shall be
13 // included in all copies or substantial portions of the Software.
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 // ***********************************************************************
25 #define NUNIT_FRAMEWORK
29 namespace NUnit.Framework.Constraints
32 /// Abstract base class for all binary operators
34 public abstract class BinaryOperator : ConstraintOperator
37 /// Reduce produces a constraint from the operator and
38 /// any arguments. It takes the arguments from the constraint
39 /// stack and pushes the resulting constraint on it.
41 /// <param name="stack"></param>
42 public override void Reduce(ConstraintBuilder.ConstraintStack stack)
44 IConstraint right = stack.Pop();
45 IConstraint left = stack.Pop();
46 stack.Push(ApplyOperator(left, right));
50 /// Gets the left precedence of the operator
52 public override int LeftPrecedence
56 return RightContext is CollectionOperator
57 ? base.LeftPrecedence + 10
58 : base.LeftPrecedence;
63 /// Gets the right precedence of the operator
65 public override int RightPrecedence
69 return RightContext is CollectionOperator
70 ? base.RightPrecedence + 10
71 : base.RightPrecedence;
76 /// Abstract method that produces a constraint by applying
77 /// the operator to its left and right constraint arguments.
79 public abstract IConstraint ApplyOperator(IConstraint left, IConstraint right);