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.Persistence.Default.CompositeSerializers.Storable;
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5 | using HeuristicLab.Problems.ProgramSynthesis.Push.Attributes;
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6 | using HeuristicLab.Problems.ProgramSynthesis.Push.Stack;
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7 |
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8 | using Interpreter;
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9 |
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10 | /// <summary>
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11 | /// If the top item of the BOOLEAN stack is TRUE then this removes the second item on the EXEC stack, leaving the first
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12 | /// item to be executed. If it is false then it removes the first item, leaving the second to be executed. This is similar to
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13 | /// CODE.IF except that it operates on the EXEC stack. This acts as a NOOP unless there are at least two items on the EXEC stack and
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14 | /// one item on the BOOLEAN stack.
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15 | /// </summary>
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16 | [StorableClass]
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17 | [PushExpression(StackTypes.Exec, "EXEC.IF", StackTypes.Boolean, execIn: 2)]
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18 | public class ExecIfExpression : StatelessExpression {
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19 | public ExecIfExpression() { }
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20 | [StorableConstructor]
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21 | protected ExecIfExpression(bool deserializing) : base(deserializing) { }
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22 |
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23 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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24 | return (interpreter.BooleanStack.Count == 0) || (interpreter.ExecStack.Count < 2);
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25 | }
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26 |
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27 | public override void Eval(IInternalPushInterpreter interpreter) {
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28 | var condition = interpreter.BooleanStack.Pop();
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29 |
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30 | if (condition) interpreter.ExecStack.RemoveAt(interpreter.ExecStack.Count - 2);
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31 | else interpreter.ExecStack.RemoveTop();
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32 | }
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33 | }
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34 |
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35 | /// <summary>
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36 | /// Inserts beneath the top item of the EXEC stack a new item of the form
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37 | /// "( EXEC.Y <TopItem> )".
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38 | /// </summary>
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39 | [PushExpression(StackTypes.Exec, "EXEC.Y", execIn: 1)]
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40 | [StorableClass]
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41 | public class ExecYExpression : StatelessExpression {
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42 | public ExecYExpression() { }
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43 | [StorableConstructor]
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44 | protected ExecYExpression(bool deserializing) : base(deserializing) { }
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45 |
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46 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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47 | return interpreter.ExecStack.Count == 0 ||
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48 | interpreter.Configuration.MaxPointsInProgram < 2 ||
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49 | (interpreter.ExecStack.Top.IsProgram && ((PushProgram)interpreter.ExecStack.Top).Depth == interpreter.Configuration.MaxDepth);
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50 | }
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51 |
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52 | public override void Eval(IInternalPushInterpreter interpreter) {
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53 | var top = interpreter.ExecStack.Top;
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54 | var execYExpression = ExpressionTable.GetStatelessExpression<ExecYExpression>();
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55 | var expressions = interpreter.PoolContainer.ExpressionListPool.Get();
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56 |
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57 | expressions.Add(top);
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58 | expressions.Add(execYExpression);
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59 |
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60 | var result = PushProgram.Create(interpreter.PoolContainer.PushProgramPool, expressions);
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61 |
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62 | interpreter.ExecStack.Top = result;
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63 | interpreter.ExecStack.Add(top);
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64 | }
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65 | }
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66 |
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67 | /// <summary>
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68 | /// Removes the second item on the EXEC stack.
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69 | /// </summary>
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70 | [PushExpression(StackTypes.Exec, "EXEC.K", execIn: 2)]
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71 | [StorableClass]
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72 | public class ExecKExpression : StatelessExpression {
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73 | public ExecKExpression() { }
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74 | [StorableConstructor]
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75 | protected ExecKExpression(bool deserializing) : base(deserializing) { }
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76 |
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77 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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78 | return interpreter.ExecStack.Count < 2;
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79 | }
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80 |
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81 | public override void Eval(IInternalPushInterpreter interpreter) {
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82 | var top = interpreter.ExecStack.Pop();
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83 | interpreter.ExecStack.Top = top;
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84 | }
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85 | }
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86 |
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87 | /// <summary>
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88 | /// Pops 3 items from the EXEC stack, which we will call A, B, and C
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89 | /// (with A being the first one popped). Then pushes a list containing B and C back onto the EXEC stack, followed by
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90 | /// another instance of C, followed by another instance of A.
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91 | /// </summary>
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92 | [PushExpression(StackTypes.Exec, "EXEC.S", execIn: 3)]
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93 | [StorableClass]
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94 | public class ExecSExpression : StatelessExpression {
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95 | public ExecSExpression() { }
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96 | [StorableConstructor]
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97 | protected ExecSExpression(bool deserializing) : base(deserializing) { }
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98 |
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99 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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100 | return interpreter.ExecStack.Count < 3 ||
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101 | (interpreter.ExecStack.Top is PushProgram && ((PushProgram)interpreter.ExecStack.Top).Depth == interpreter.Configuration.MaxDepth) ||
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102 | (interpreter.ExecStack[1] is PushProgram && ((PushProgram)interpreter.ExecStack[1]).Depth == interpreter.Configuration.MaxDepth);
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103 | }
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104 |
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105 | public override void Eval(IInternalPushInterpreter interpreter) {
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106 | var a = interpreter.ExecStack.Top;
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107 | var b = interpreter.ExecStack[1];
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108 | var c = interpreter.ExecStack[2];
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109 | interpreter.ExecStack.Remove(2);
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110 |
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111 | var expressions = interpreter.PoolContainer.ExpressionListPool.Get();
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112 | expressions.Add(c);
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113 | expressions.Add(b);
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114 |
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115 | var newTop = PushProgram.Create(interpreter.PoolContainer.PushProgramPool, expressions);
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116 |
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117 | interpreter.ExecStack.Top = newTop;
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118 | interpreter.ExecStack.Push(c, a);
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119 | }
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120 | }
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121 |
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122 | /// <summary>
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123 | /// Does nothing.
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124 | /// </summary>
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125 | ///
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126 | [StorableClass]
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127 | [Serializable]
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128 | [PushExpression(StackTypes.Exec, "EXEC.NOOP")]
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129 | public class ExecNoopExpression : StatelessExpression {
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130 | public ExecNoopExpression() { }
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131 | [StorableConstructor]
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132 | protected ExecNoopExpression(bool deserializing) : base(deserializing) { }
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133 |
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134 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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135 | return true;
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136 | }
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137 |
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138 | public override void Eval(IInternalPushInterpreter interpreter) {
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139 | // do nothing
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140 | }
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141 | }
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142 |
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143 | [PushExpression(StackTypes.Exec, "EXEC.WHILE", StackTypes.Boolean, execIn: 1)]
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144 | [StorableClass]
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145 | public class ExecWhileExpression : StatelessExpression {
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146 | public ExecWhileExpression() { }
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147 | [StorableConstructor]
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148 | protected ExecWhileExpression(bool deserializing) : base(deserializing) { }
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149 |
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150 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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151 | return interpreter.ExecStack.IsEmpty;
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152 | }
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153 |
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154 | public override void Eval(IInternalPushInterpreter interpreter) {
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155 | if (interpreter.BooleanStack.IsEmpty) {
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156 | interpreter.ExecStack.Pop();
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157 | return;
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158 | }
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159 |
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160 | var booleanTop = interpreter.BooleanStack.Pop();
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161 |
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162 | if (!booleanTop) {
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163 | interpreter.ExecStack.Pop();
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164 | return;
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165 | }
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166 |
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167 | interpreter.ExecStack.Push(this, interpreter.ExecStack.Top);
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168 | }
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169 | }
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170 |
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171 | [PushExpression(StackTypes.Exec, "EXEC.DO*WHILE", execIn: 1)]
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172 | [StorableClass]
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173 | public class ExecDoWhileExpression : StatelessExpression {
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174 | public ExecDoWhileExpression() { }
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175 | [StorableConstructor]
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176 | protected ExecDoWhileExpression(bool deserializing) : base(deserializing) { }
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177 |
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178 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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179 | return interpreter.ExecStack.IsEmpty;
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180 | }
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181 |
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182 | public override void Eval(IInternalPushInterpreter interpreter) {
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183 | interpreter.ExecStack.Push(this, interpreter.ExecStack.Top);
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184 | }
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185 | }
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186 |
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187 | [PushExpression(StackTypes.Exec, "EXEC.WHEN", StackTypes.Boolean, execIn: 1)]
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188 | [StorableClass]
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189 | public class ExecWhenExpression : StatelessExpression {
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190 | public ExecWhenExpression() { }
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191 | [StorableConstructor]
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192 | protected ExecWhenExpression(bool deserializing) : base(deserializing) { }
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193 |
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194 | public override bool IsNoop(IInternalPushInterpreter interpreter) {
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195 | return interpreter.ExecStack.IsEmpty ||
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196 | interpreter.BooleanStack.IsEmpty;
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197 | }
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198 |
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199 | public override void Eval(IInternalPushInterpreter interpreter) {
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200 | var when = interpreter.BooleanStack.Pop();
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201 |
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202 | if (!when) {
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203 | interpreter.ExecStack.Pop();
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204 | }
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205 | }
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206 | }
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207 | } |
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