1 | namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
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2 | using HeuristicLab.Problems.ProgramSynthesis.Push.Attributes;
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3 |
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4 | using Interpreter;
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5 | using Stack;
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6 |
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7 | /// <summary>
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8 | /// Swaps the top two values.
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9 | /// </summary>
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10 | /// <typeparam name="T">Stacktype</typeparam>
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11 | public abstract class SwapExpression<T> : StatelessExpression {
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12 | public bool Eval(IStack<T> stack) {
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13 | if (stack.Count < 2)
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14 | return false;
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15 |
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16 | stack.Swap(2);
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17 | return true;
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18 | }
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19 | }
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20 |
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21 | [PushExpression(StackType.Integer, "INTEGER.SWAP")]
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22 | public class IntegerSwapExpression : SwapExpression<long> {
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23 | public override bool Eval(IPushInterpreter interpreter) {
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24 | return Eval(interpreter.IntegerStack);
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25 | }
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26 | }
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27 |
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28 | [PushExpression(StackType.Float, "FLOAT.SWAP")]
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29 | public class FloatSwapExpression : SwapExpression<double> {
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30 | public override bool Eval(IPushInterpreter interpreter) {
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31 | return Eval(interpreter.FloatStack);
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32 | }
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33 | }
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34 |
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35 | [PushExpression(StackType.Boolean, "BOOLEAN.SWAP")]
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36 | public class BooleanSwapExpression : SwapExpression<bool> {
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37 | public override bool Eval(IPushInterpreter interpreter) {
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38 | return Eval(interpreter.BooleanStack);
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39 | }
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40 | }
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41 |
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42 | [PushExpression(StackType.Name, "NAME.SWAP")]
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43 | public class NameSwapExpression : SwapExpression<string> {
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44 | public override bool Eval(IPushInterpreter interpreter) {
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45 | return Eval(interpreter.NameStack);
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46 | }
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47 | }
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48 |
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49 | [PushExpression(StackType.Exec, "EXEC.SWAP")]
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50 | public class ExecSwapExpression : SwapExpression<Expression> {
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51 | public override bool Eval(IPushInterpreter interpreter) {
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52 | return Eval(interpreter.ExecStack);
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53 | }
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54 | }
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55 |
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56 | [PushExpression(StackType.Code, "CODE.SWAP")]
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57 | public class CodeSwapExpression : SwapExpression<Expression> {
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58 | public override bool Eval(IPushInterpreter interpreter) {
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59 | return Eval(interpreter.CodeStack);
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60 | }
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61 | }
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62 | } |
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