1 | namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
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2 | using System;
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3 |
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4 | using HeuristicLab.Problems.ProgramSynthesis.Push.Attributes;
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5 | using HeuristicLab.Problems.ProgramSynthesis.Push.Stack;
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6 |
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7 | using Interpreter;
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8 |
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9 | /// <summary>
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10 | /// Pushes the sum of the top two items.
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11 | /// </summary>
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12 | [PushExpression(StackType.Integer, "INTEGER.+")]
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13 | public class IntegerAddExpression : PushResultExpression<long> {
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14 | public override void Eval(IPushGpInterpreter interpreter) {
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15 | this.Eval(interpreter.IntegerStack, 2, values => values[0] + values[1]);
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16 | }
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17 | }
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18 |
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19 | /// <summary>
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20 | /// Pushes the difference of the top two items; that is, the second item minus the top item.
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21 | /// </summary>
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22 | [PushExpression(StackType.Integer, "INTEGER.-")]
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23 | public class IntegerSubtractExpression : PushResultExpression<long> {
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24 | public override void Eval(IPushGpInterpreter interpreter) {
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25 | this.Eval(interpreter.IntegerStack, 2, values => values[0] - values[1]);
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26 | }
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27 | }
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28 |
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29 | /// <summary>
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30 | /// Pushes the product of the top two items.
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31 | /// </summary>
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32 | [PushExpression(StackType.Integer, "INTEGER.*")]
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33 | public class IntegerMultiplyExpression : PushResultExpression<long> {
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34 | public override void Eval(IPushGpInterpreter interpreter) {
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35 | this.Eval(interpreter.IntegerStack, 2, values => values[0] * values[1]);
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36 | }
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37 | }
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38 |
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39 | /// <summary>
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40 | /// Pushes the quotient of the top two items; that is, the second item divided by the top item.
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41 | /// If the top item is zero this acts as a NOOP.
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42 | /// </summary>
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43 | [PushExpression(StackType.Integer, "INTEGER./")]
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44 | public class IntegerDivideExpression : PushResultExpression<long> {
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45 | public override void Eval(IPushGpInterpreter interpreter) {
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46 | this.Eval(interpreter.IntegerStack, 2, values => values[0] / values[1], 0);
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47 | }
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48 | }
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49 |
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50 | /// <summary>
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51 | /// Pushes the second stack item modulo the top stack item. If the top item is zero this acts as a NOOP. The modulus is
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52 | /// computed as the
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53 | /// remainder of the quotient, where the quotient has first been truncated toward negative infinity. (This is taken
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54 | /// from the definition
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55 | /// for the generic MOD function in Common Lisp, which is described for example at
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56 | /// http://www.lispworks.com/reference/HyperSpec/Body/f_mod_r.htm.)
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57 | /// </summary>
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58 | [PushExpression(StackType.Integer, "INTEGER.%")]
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59 | public class IntegerModuloExpression : PushResultExpression<long> {
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60 | public override void Eval(IPushGpInterpreter interpreter) {
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61 | this.Eval(interpreter.IntegerStack, 2, values => values[0] % values[1], 0);
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62 | }
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63 | }
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64 |
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65 | /// <summary>
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66 | /// Pushes the minimum of the top two items.
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67 | /// </summary>
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68 | [PushExpression(StackType.Integer, "INTEGER.MIN")]
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69 | public class IntegerMinExpression : PushResultExpression<long> {
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70 | public override void Eval(IPushGpInterpreter interpreter) {
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71 | this.Eval(interpreter.IntegerStack, 2, values => Math.Min(values[0], values[1]));
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72 | }
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73 | }
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74 |
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75 | /// <summary>
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76 | /// Pushes the maximum of the top two items.
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77 | /// </summary>
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78 | [PushExpression(StackType.Integer, "INTEGER.MAX")]
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79 | public class IntegerMaxExpression : PushResultExpression<long> {
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80 | public override void Eval(IPushGpInterpreter interpreter) {
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81 | this.Eval(interpreter.IntegerStack, 2, values => Math.Max(values[0], values[1]));
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82 | }
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83 | }
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84 |
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85 | /// <summary>
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86 | /// Pushes TRUE onto the BOOLEAN stack if the second item is less than the top item, or FALSE otherwise.
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87 | /// </summary>
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88 | [PushExpression(StackType.Integer, "INTEGER.<")]
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89 | public class IntegerSmallerThanExpression : PushResultExpression<long> {
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90 | public override void Eval(IPushGpInterpreter interpreter) {
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91 | this.Eval(interpreter.IntegerStack, interpreter.BooleanStack, 2, values => values[0] < values[1]);
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92 | }
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93 | }
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94 |
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95 | /// <summary>
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96 | /// Pushes TRUE onto the BOOLEAN stack if the second item is greater than the top item, or FALSE otherwise.
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97 | /// </summary>
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98 | [PushExpression(StackType.Integer, "INTEGER.>")]
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99 | public class IntegerGreaterThanExpression : PushResultExpression<long> {
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100 | public override void Eval(IPushGpInterpreter interpreter) {
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101 | this.Eval(interpreter.IntegerStack, interpreter.BooleanStack, 2, values => values[0] > values[1]);
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102 | }
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103 | }
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104 |
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105 | /// <summary>
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106 | /// Pushes 1 if the top BOOLEAN is TRUE, or 0 if the top BOOLEAN is FALSE.
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107 | /// </summary>
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108 | [PushExpression(StackType.Integer, "INTEGER.FROMBOOLEAN")]
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109 | public class IntegerFromBooleanExpression : StatelessExpression {
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110 | public override void Eval(IPushGpInterpreter interpreter) {
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111 | if (interpreter.BooleanStack.Count == 0) return;
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112 |
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113 | var condition = interpreter.BooleanStack.Pop();
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114 | var value = condition ? 1 : 0;
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115 |
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116 | interpreter.IntegerStack.Push(value);
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117 | }
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118 | }
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119 |
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120 | /// <summary>
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121 | /// Pushes the result of truncating the top FLOAT.
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122 | /// </summary>
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123 | [PushExpression(StackType.Integer, "INTEGER.FROMFLOAT")]
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124 | public class IntegerFromFloatExpression : StatelessExpression {
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125 | public override void Eval(IPushGpInterpreter interpreter) {
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126 | if (interpreter.FloatStack.Count == 0) return;
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127 |
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128 | var value = (int)interpreter.FloatStack.Pop();
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129 |
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130 | interpreter.IntegerStack.Push(value);
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131 | }
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132 | }
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133 | } |
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