1 | namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
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2 | using HeuristicLab.Problems.ProgramSynthesis.Push.Attributes;
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3 | using HeuristicLab.Problems.ProgramSynthesis.Push.Interpreter;
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4 | using HeuristicLab.Problems.ProgramSynthesis.Push.Stack;
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5 |
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6 | /// <summary>
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7 | /// Pushes the logical AND of the top two BOOLEANs.
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8 | /// </summary>
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9 | [PushExpression(StackType.Boolean, "BOOLEAN.AND")]
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10 | public class BooleanAndExpression : PushResultExpression<bool> {
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11 | public override bool Eval(IPushInterpreter interpreter) {
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12 | return Eval(interpreter.BooleanStack, 2, values => values[0] && values[1]);
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13 | }
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14 | }
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15 |
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16 | /// <summary>
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17 | /// Pushes the logical OR of the top two BOOLEANs.
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18 | /// </summary>
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19 | [PushExpression(StackType.Boolean, "BOOLEAN.OR")]
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20 | public class BooleanOrExpression : PushResultExpression<bool> {
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21 | public override bool Eval(IPushInterpreter interpreter) {
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22 | return Eval(interpreter.BooleanStack, 2, values => values[0] || values[1]);
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23 | }
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24 | }
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25 |
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26 | /// <summary>
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27 | /// Pushes the logical NOT of the top BOOLEAN.
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28 | /// </summary>
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29 | [PushExpression(StackType.Boolean, "BOOLEAN.NOT")]
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30 | public class BooleanNotExpression : PushResultExpression<bool> {
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31 | public override bool Eval(IPushInterpreter interpreter) {
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32 | return Eval(interpreter.BooleanStack, 1, values => !values[0]);
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33 | }
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34 | }
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35 |
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36 | /// <summary>
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37 | /// Pushes FALSE if the top FLOAT is 0.0, or TRUE otherwise.
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38 | /// </summary>
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39 | [PushExpression(StackType.Boolean, "BOOLEAN.FROMFLOAT")]
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40 | public class BooleanFromFloatExpression : StatelessExpression {
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41 | public override bool Eval(IPushInterpreter interpreter) {
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42 | if (interpreter.FloatStack.Count == 0) return false;
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43 |
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44 | var value = interpreter.FloatStack.Pop() != 0.0;
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45 |
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46 | interpreter.BooleanStack.Push(value);
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47 | return true;
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48 | }
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49 | }
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50 |
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51 | /// <summary>
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52 | /// Pushes FALSE if the top INTEGER is 0, or TRUE otherwise.
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53 | /// </summary>
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54 | [PushExpression(StackType.Boolean, "BOOLEAN.FROMINTEGER")]
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55 | public class BooleanFromIntegerExpression : StatelessExpression {
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56 | public override bool Eval(IPushInterpreter interpreter) {
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57 | if (interpreter.IntegerStack.Count == 0) return false;
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58 |
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59 | var value = interpreter.IntegerStack.Pop() != 0;
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60 |
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61 | interpreter.BooleanStack.Push(value);
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62 | return true;
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63 | }
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64 | }
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65 | } |
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