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 |
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5 | using Stack;
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6 |
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7 | /// <summary>
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8 | /// Tells whether that stack is empty.
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9 | /// </summary>
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10 | public abstract class EmptyExpresssions<T> : StatelessExpression {
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11 | public bool Eval(IStack<T> stack, IStack<bool> booleanStack) {
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12 | booleanStack.Push(stack.IsEmpty);
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13 |
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14 | return true;
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15 | }
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16 | }
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17 |
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18 | [PushExpression(StackTypes.Exec, "EXEC.EMPTY", StackTypes.Boolean)]
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19 | public class ExecEmptyExpression : EmptyExpresssions<Expression> {
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20 | public override bool Eval(IPushInterpreter interpreter) {
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21 | return Eval(interpreter.ExecStack, interpreter.BooleanStack);
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22 | }
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23 | }
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24 |
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25 | [PushExpression(StackTypes.Code, "CODE.EMPTY", StackTypes.Boolean)]
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26 | public class CodeEmptyExpression : EmptyExpresssions<Expression> {
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27 | public override bool Eval(IPushInterpreter interpreter) {
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28 | return Eval(interpreter.CodeStack, interpreter.BooleanStack);
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29 | }
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30 | }
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31 |
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32 | [PushExpression(StackTypes.Integer, "INTEGER.EMPTY", StackTypes.Boolean)]
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33 | public class IntegerEmptyExpression : EmptyExpresssions<long> {
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34 | public override bool Eval(IPushInterpreter interpreter) {
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35 | return Eval(interpreter.IntegerStack, interpreter.BooleanStack);
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36 | }
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37 | }
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38 |
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39 | [PushExpression(StackTypes.Float, "FLOAT.EMPTY", StackTypes.Boolean)]
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40 | public class FloatEmptyExpression : EmptyExpresssions<double> {
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41 | public override bool Eval(IPushInterpreter interpreter) {
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42 | return Eval(interpreter.FloatStack, interpreter.BooleanStack);
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43 | }
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44 | }
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45 |
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46 | [PushExpression(StackTypes.Boolean, "BOOLEAN.EMPTY", StackTypes.Boolean)]
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47 | public class BooleanEmptyExpression : EmptyExpresssions<bool> {
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48 | public override bool Eval(IPushInterpreter interpreter) {
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49 | return Eval(interpreter.BooleanStack, interpreter.BooleanStack);
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50 | }
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51 | }
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52 |
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53 | [PushExpression(StackTypes.Char, "CHAR.EMPTY", StackTypes.Boolean)]
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54 | public class CharEmptyExpression : EmptyExpresssions<char> {
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55 | public override bool Eval(IPushInterpreter interpreter) {
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56 | return Eval(interpreter.CharStack, interpreter.BooleanStack);
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57 | }
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58 | }
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59 |
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60 | [PushExpression(StackTypes.String, "STRING.EMPTY", StackTypes.Boolean)]
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61 | public class StringEmptyExpression : EmptyExpresssions<string> {
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62 | public override bool Eval(IPushInterpreter interpreter) {
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63 | return Eval(interpreter.StringStack, interpreter.BooleanStack);
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64 | }
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65 | }
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66 | }
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