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996
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1 // Action.h
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2
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3 #ifndef ACTION_H_RAIL_1
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4 #define ACTION_H_RAIL_1
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5
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6 #include "Binding.h"
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7 #include "Dir.h"
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8 #include "NilVar.h"
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9 #include "StringVar.h"
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10 #include "ListVar.h"
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11 #include "Closure.h"
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12 #include "Board.h"
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13 #include "ActivationRecord.h"
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14 #include "Error.h"
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15
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16 class Action
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17 {
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18 public:
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19 virtual void run(std::list<Binding> & dataStack,
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20 std::list<ActivationRecord> & programStack,
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21 std::map<std::string, Board> & globals)=0;
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22 public:
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23 // Helper functions. These are called from individual actions to do
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24 // a common task.
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25 static Action * charToAction(char current);
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26 static void checkVarCount(std::list<Binding> const & theStack, int count);
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27 static bool checkBool(Binding var);
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28 static int checkNumeric(Binding var);
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29 static ConsCell checkList(Binding var);
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30 static std::string checkString(Binding var);
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31
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32 static bool areEqual(Binding left, Binding right);
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33
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34 static void runY(std::list<Binding> & dataStack,
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35 std::list<ActivationRecord> & programStack,
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36 Dir::t first, Dir::t second, Dir::t third);
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37 static void callFunctionByName(std::string const & name,
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38 std::list<ActivationRecord> & programStack,
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39 std::map<std::string, Board> const & globals);
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40 };
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41
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42 class Nop : public Action
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43 {
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44 public:
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45 static Nop v;
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46 virtual void run(std::list<Binding> &, std::list<ActivationRecord> &,
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47 std::map<std::string, Board> &)
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48 {
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49 }
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50 };
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51
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52 class True : public Action
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53 {
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54 public:
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55 static True v;
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56 virtual void run(std::list<Binding> & dataStack,
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57 std::list<ActivationRecord> &,
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58 std::map<std::string, Board> &)
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59 {
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60 dataStack.push_front(Binding(new StringVar("1")));
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61 }
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62 };
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63
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64 class False : public Action
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65 {
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66 public:
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67 static False v;
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68 virtual void run(std::list<Binding> & dataStack,
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69 std::list<ActivationRecord> &,
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70 std::map<std::string, Board> &)
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71 {
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72 dataStack.push_front(Binding(new StringVar("0")));
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73 }
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74 };
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75
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76 // The direction before the y junction is the direction which the
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77 // 'arrow' points to. So '>' is an EastY.
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78
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79 // This is the '>' junction.
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80 class EastY : public Action
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81 {
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82 public:
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83 static EastY v;
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84 virtual void run(std::list<Binding> & dataStack,
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85 std::list<ActivationRecord> & programStack,
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86 std::map<std::string, Board> &)
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87 {
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88 runY(dataStack, programStack, Dir::west, Dir::southeast, Dir::northeast);
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89 }
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90 };
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91
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92 // This is the '<' junction.
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93 class WestY : public Action
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94 {
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95 public:
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96 static WestY v;
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97 virtual void run(std::list<Binding> & dataStack,
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98 std::list<ActivationRecord> & programStack,
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99 std::map<std::string, Board> &)
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100 {
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101 runY(dataStack, programStack, Dir::east, Dir::northwest, Dir::southwest);
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102 }
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103 };
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104
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105 // This is the '^' junction.
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106 class NorthY : public Action
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107 {
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108 public:
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109 static NorthY v;
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110 virtual void run(std::list<Binding> & dataStack,
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111 std::list<ActivationRecord> & programStack,
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112 std::map<std::string, Board> &)
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113 {
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114 runY(dataStack, programStack, Dir::south, Dir::northeast, Dir::northwest);
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115 }
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116 };
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117
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118 // This is the 'v' junction.
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119 class SouthY : public Action
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120 {
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121 public:
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122 static SouthY v;
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123 virtual void run(std::list<Binding> & dataStack,
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124 std::list<ActivationRecord> & programStack,
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125 std::map<std::string, Board> &)
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126 {
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127 runY(dataStack, programStack, Dir::north, Dir::southwest, Dir::southeast);
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128 }
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129 };
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130
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131 class Boom : public Action
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132 {
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133 public:
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134 static Boom v;
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135 virtual void run(std::list<Binding> & dataStack,
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136 std::list<ActivationRecord> &,
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137 std::map<std::string, Board> &)
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138 {
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139 checkVarCount(dataStack, 1);
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140 std::string custom = checkString(dataStack.front());
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141 throw CrashException(Error::custom, custom);
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142 }
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143 };
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144
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145 class EofCheck : public Action
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146 {
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147 public:
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148 static EofCheck v;
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149 virtual void run(std::list<Binding> & dataStack,
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150 std::list<ActivationRecord> & programStack,
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151 std::map<std::string, Board> & globals)
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152 {
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153 if (args::input->peek() == EOF)
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154 {
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155 True::v.run(dataStack, programStack, globals);
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156 }
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157 else
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158 {
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159 False::v.run(dataStack, programStack, globals);
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160 }
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161 }
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162 };
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163
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164 class Input : public Action
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165 {
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166 public:
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167 static Input v;
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168 virtual void run(std::list<Binding> & dataStack,
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169 std::list<ActivationRecord> &,
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170 std::map<std::string, Board> &)
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171 {
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172 int val = args::input->get();
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173 if (val == EOF)
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174 {
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175 throw CrashException(Error::noMoreInput);
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176 }
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177 else
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178 {
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179 dataStack.push_front(Binding(new StringVar(static_cast<char>(val)
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180 + std::string())));
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181 }
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182 }
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183 };
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184
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185 class Output : public Action
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186 {
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187 public:
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188 static Output v;
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189 virtual void run(std::list<Binding> & dataStack,
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190 std::list<ActivationRecord> &,
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191 std::map<std::string, Board> &)
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192 {
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193 checkVarCount(dataStack, 1);
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194 std::string val = checkString(dataStack.front());
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195 dataStack.pop_front();
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196 *(args::output) << val;
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197 }
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198 };
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199
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200 class Underflow : public Action
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201 {
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202 public:
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203 static Underflow v;
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204 virtual void run(std::list<Binding> & dataStack,
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205 std::list<ActivationRecord> &,
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206 std::map<std::string, Board> &)
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207 {
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208 std::string count = intToString(static_cast<int>(dataStack.size()));
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209 dataStack.push_front(Binding(new StringVar(count)));
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210 }
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211 };
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212
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213 class TypeP : public Action
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214 {
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215 public:
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216 static TypeP v;
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217 virtual void run(std::list<Binding> & dataStack,
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218 std::list<ActivationRecord> &,
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219 std::map<std::string, Board> &)
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220 {
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221 checkVarCount(dataStack, 1);
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222 Binding top = dataStack.front();
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223 dataStack.pop_front();
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224 std::string type;
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225 if (top->getString() != NULL)
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226 {
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227 type = "string";
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228 }
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229 else if (top->getList() != NULL)
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230 {
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231 type = "list";
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232 }
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233 else if (top->getNil() != NULL)
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234 {
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235 type = "nil";
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236 }
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237 else if (top->getClosure() != NULL)
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238 {
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239 type = "lambda";
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240 }
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241 else
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242 {
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243 throw InternalException("TypeP::run(): Unknown type");
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244 }
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245 dataStack.push_front(Binding(new StringVar(type)));
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246 }
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247 };
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248
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249 class PushConstant : public Action
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250 {
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251 public:
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252 static PushConstant v;
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253 virtual void run(std::list<Binding> & dataStack,
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254 std::list<ActivationRecord> &,
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255 std::map<std::string, Board> &)
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256 {
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257 // Our job is done. The system pushed the string in delimiters
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258 // onto the stack. That is just what we want to do.
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259 checkVarCount(dataStack, 1);
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260 checkString(dataStack.front());
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261 }
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262 };
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263
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264 class UseVariable : public Action
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265 {
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266 public:
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267 static UseVariable v;
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268 virtual void run(std::list<Binding> & dataStack,
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269 std::list<ActivationRecord> & programStack,
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270 std::map<std::string, Board> &)
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271 {
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272 checkVarCount(dataStack, 1);
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273 std::string varName = checkString(dataStack.front());
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274 dataStack.pop_front();
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275 std::map<std::string, Binding>::const_iterator pos
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276 = programStack.front().getEnvironment().find(varName);
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277 if (pos != programStack.front().getEnvironment().end())
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278 {
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279 dataStack.push_front(pos->second);
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280 }
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281 else
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282 {
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283 throw CrashException(Error::localBindingNotFound);
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284 }
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285 }
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286 };
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287
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288 class BindVariable : public Action
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289 {
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290 public:
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291 static BindVariable v;
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292 virtual void run(std::list<Binding> & dataStack,
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293 std::list<ActivationRecord> & programStack,
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294 std::map<std::string, Board> &)
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295 {
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296 checkVarCount(dataStack, 2);
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297 std::string varName = checkString(dataStack.front());
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298 dataStack.pop_front();
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299 programStack.front().bindVariable(varName, dataStack.front());
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300 dataStack.pop_front();
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301 }
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302 };
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303
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304 class CallFunction : public Action
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305 {
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306 public:
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307 static CallFunction v;
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308 virtual void run(std::list<Binding> & dataStack,
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309 std::list<ActivationRecord> & programStack,
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310 std::map<std::string, Board> & globals)
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311 {
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312 checkVarCount(dataStack, 1);
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313 std::string functionName = checkString(dataStack.front());
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314 dataStack.pop_front();
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315 if (functionName != "")
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316 {
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317 callFunctionByName(functionName, programStack, globals);
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318 }
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319 else
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320 {
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321 Binding function = dataStack.front();
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322 if (function->getString() != NULL)
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323 {
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324 callFunctionByName(function->getString()->get(), programStack,
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325 globals);
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326 }
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327 else if (function->getClosure() != NULL)
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328 {
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329 programStack.push_front(ActivationRecord(*(function->getClosure())));
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330 }
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331 else
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332 {
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333 throw CrashException(Error::typeMismatch);
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334 }
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335 dataStack.pop_front();
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336 }
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337 }
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338 };
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339
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340 class Add : public Action
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341 {
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342 public:
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343 static Add v;
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344 virtual void run(std::list<Binding> & dataStack,
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345 std::list<ActivationRecord> &,
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346 std::map<std::string, Board> &)
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347 {
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348 checkVarCount(dataStack, 2);
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349 int right = checkNumeric(dataStack.front());
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350 dataStack.pop_front();
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351 int left = checkNumeric(dataStack.front());
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352 dataStack.pop_front();
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353 dataStack.push_front(Binding(new StringVar(intToString(left + right))));
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354 }
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355 };
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356
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357 class Divide : public Action
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358 {
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359 public:
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360 static Divide v;
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361 virtual void run(std::list<Binding> & dataStack,
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362 std::list<ActivationRecord> &,
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363 std::map<std::string, Board> &)
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364 {
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365 checkVarCount(dataStack, 2);
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366 int right = checkNumeric(dataStack.front());
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367 dataStack.pop_front();
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368 int left = checkNumeric(dataStack.front());
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369 dataStack.pop_front();
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370 dataStack.push_front(Binding(new StringVar(intToString(left / right))));
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371 }
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372 };
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373
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374 class Multiply : public Action
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375 {
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376 public:
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377 static Multiply v;
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378 virtual void run(std::list<Binding> & dataStack,
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379 std::list<ActivationRecord> &,
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380 std::map<std::string, Board> &)
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381 {
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382 checkVarCount(dataStack, 2);
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383 int right = checkNumeric(dataStack.front());
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384 dataStack.pop_front();
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385 int left = checkNumeric(dataStack.front());
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386 dataStack.pop_front();
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387 dataStack.push_front(Binding(new StringVar(intToString(left * right))));
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388 }
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389 };
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390
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391 class Remainder : public Action
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392 {
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393 public:
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394 static Remainder v;
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395 virtual void run(std::list<Binding> & dataStack,
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396 std::list<ActivationRecord> &,
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397 std::map<std::string, Board> &)
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398 {
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399 checkVarCount(dataStack, 2);
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400 int right = checkNumeric(dataStack.front());
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401 dataStack.pop_front();
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402 int left = checkNumeric(dataStack.front());
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403 dataStack.pop_front();
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404 dataStack.push_front(Binding(new StringVar(intToString(left % right))));
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405 }
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406 };
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407
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408 class Subtract : public Action
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409 {
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410 public:
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411 static Subtract v;
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412 virtual void run(std::list<Binding> & dataStack,
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413 std::list<ActivationRecord> &,
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414 std::map<std::string, Board> &)
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415 {
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416 checkVarCount(dataStack, 2);
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417 int right = checkNumeric(dataStack.front());
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418 dataStack.pop_front();
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419 int left = checkNumeric(dataStack.front());
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420 dataStack.pop_front();
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421 dataStack.push_front(Binding(new StringVar(intToString(left - right))));
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422 }
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423 };
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424
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425 class Digit : public Action
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426 {
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427 public:
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428 static Digit v0;
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429 static Digit v1;
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430 static Digit v2;
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431 static Digit v3;
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432 static Digit v4;
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433 static Digit v5;
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434 static Digit v6;
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435 static Digit v7;
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436 static Digit v8;
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437 static Digit v9;
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438 Digit(int newNum = 0) : num(newNum) {}
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439 virtual void run(std::list<Binding> & dataStack,
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440 std::list<ActivationRecord> &,
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441 std::map<std::string, Board> &)
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442 {
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443 dataStack.push_front(Binding(new StringVar(intToString(num))));
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444 }
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445 private:
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446 int num;
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447 };
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448
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449 class Cut : public Action
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450 {
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451 public:
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452 static Cut v;
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453 virtual void run(std::list<Binding> & dataStack,
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454 std::list<ActivationRecord> &,
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455 std::map<std::string, Board> &)
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456 {
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457 checkVarCount(dataStack, 2);
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458 int index = checkNumeric(dataStack.front());
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459 dataStack.pop_front();
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460 std::string str = checkString(dataStack.front());
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461 dataStack.pop_front();
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462 if (index < 0 || index > static_cast<int>(str.size()))
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463 {
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464 throw CrashException(Error::indexOutOfBounds);
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465 }
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466 std::string leftResult = str.substr(0, index);
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467 std::string rightResult = str.substr(index);
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468 dataStack.push_front(Binding(new StringVar(leftResult)));
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469 dataStack.push_front(Binding(new StringVar(rightResult)));
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470 }
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471 };
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472
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473 class Append : public Action
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474 {
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475 public:
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476 static Append v;
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477 virtual void run(std::list<Binding> & dataStack,
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478 std::list<ActivationRecord> &,
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479 std::map<std::string, Board> &)
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480 {
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481 checkVarCount(dataStack, 2);
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482 std::string right = checkString(dataStack.front());
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483 dataStack.pop_front();
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484 std::string left = checkString(dataStack.front());
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485 dataStack.pop_front();
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486 dataStack.push_front(Binding(new StringVar(left + right)));
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487 }
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488 };
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489
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490 class Size : public Action
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491 {
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492 public:
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493 static Size v;
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494 virtual void run(std::list<Binding> & dataStack,
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495 std::list<ActivationRecord> &,
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496 std::map<std::string, Board> &)
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497 {
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498 checkVarCount(dataStack, 1);
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499 std::string str = checkString(dataStack.front());
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500 dataStack.pop_front();
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501 int size = static_cast<int>(str.size());
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502 dataStack.push_front(Binding(new StringVar(intToString(size))));
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503 }
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504 };
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505
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506 class PushNIL : public Action
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507 {
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508 public:
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509 static PushNIL v;
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510 virtual void run(std::list<Binding> & dataStack,
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511 std::list<ActivationRecord> &,
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512 std::map<std::string, Board> &)
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513 {
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514 dataStack.push_front(NIL);
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515 }
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516 };
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517
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518 class Cons : public Action
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519 {
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520 public:
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521 static Cons v;
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522 virtual void run(std::list<Binding> & dataStack,
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523 std::list<ActivationRecord> &,
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524 std::map<std::string, Board> &)
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525 {
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526 checkVarCount(dataStack, 2);
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|
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527 Binding car = dataStack.front();
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|
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528 dataStack.pop_front();
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529 Binding cdr = dataStack.front();
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530 dataStack.pop_front();
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|
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531 dataStack.push_front(Binding(new ListVar(car, cdr)));
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|
|
532 }
|
|
|
533 };
|
|
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534
|
|
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535 class ListBreakup : public Action
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|
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536 {
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537 public:
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|
|
538 static ListBreakup v;
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|
|
539 virtual void run(std::list<Binding> & dataStack,
|
|
|
540 std::list<ActivationRecord> &,
|
|
|
541 std::map<std::string, Board> &)
|
|
|
542 {
|
|
|
543 checkVarCount(dataStack, 1);
|
|
|
544 ConsCell cell = checkList(dataStack.front());
|
|
|
545 dataStack.pop_front();
|
|
|
546 dataStack.push_front(cell.cdr);
|
|
|
547 dataStack.push_front(cell.car);
|
|
|
548 }
|
|
|
549 };
|
|
|
550
|
|
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551 class GreaterThan : public Action
|
|
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552 {
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|
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553 public:
|
|
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554 static GreaterThan v;
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|
|
555 virtual void run(std::list<Binding> & dataStack,
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|
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556 std::list<ActivationRecord> & programStack,
|
|
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557 std::map<std::string, Board> & globals)
|
|
|
558 {
|
|
|
559 checkVarCount(dataStack, 2);
|
|
|
560 int right = checkNumeric(dataStack.front());
|
|
|
561 dataStack.pop_front();
|
|
|
562 int left = checkNumeric(dataStack.front());
|
|
|
563 dataStack.pop_front();
|
|
|
564 if (left > right)
|
|
|
565 {
|
|
|
566 True::v.run(dataStack, programStack, globals);
|
|
|
567 }
|
|
|
568 else
|
|
|
569 {
|
|
|
570 False::v.run(dataStack, programStack, globals);
|
|
|
571 }
|
|
|
572 }
|
|
|
573 };
|
|
|
574
|
|
|
575 class IsEqualTo : public Action
|
|
|
576 {
|
|
|
577 public:
|
|
|
578 static IsEqualTo v;
|
|
|
579 virtual void run(std::list<Binding> & dataStack,
|
|
|
580 std::list<ActivationRecord> & programStack,
|
|
|
581 std::map<std::string, Board> & globals)
|
|
|
582 {
|
|
|
583 checkVarCount(dataStack, 2);
|
|
|
584 Binding right = dataStack.front();
|
|
|
585 dataStack.pop_front();
|
|
|
586 Binding left = dataStack.front();
|
|
|
587 dataStack.pop_front();
|
|
|
588 if (areEqual(left, right))
|
|
|
589 {
|
|
|
590 True::v.run(dataStack, programStack, globals);
|
|
|
591 }
|
|
|
592 else
|
|
|
593 {
|
|
|
594 False::v.run(dataStack, programStack, globals);
|
|
|
595 }
|
|
|
596 }
|
|
|
597 };
|
|
|
598
|
|
|
599 class Reflector : public Action
|
|
|
600 {
|
|
|
601 public:
|
|
|
602 static Reflector v;
|
|
|
603 virtual void run(std::list<Binding> &,
|
|
|
604 std::list<ActivationRecord> & programStack,
|
|
|
605 std::map<std::string, Board> &)
|
|
|
606 {
|
|
|
607 ActivationRecord & record = programStack.front();
|
|
|
608 record.setDirection(Dir::back(record.getDirection()));
|
|
|
609 }
|
|
|
610 };
|
|
|
611
|
|
|
612 class Lambda : public Action
|
|
|
613 {
|
|
|
614 public:
|
|
|
615 static Lambda v;
|
|
|
616 virtual void run(std::list<Binding> & dataStack,
|
|
|
617 std::list<ActivationRecord> & programStack,
|
|
|
618 std::map<std::string, Board> & globals)
|
|
|
619 {
|
|
|
620 ActivationRecord & record = programStack.front();
|
|
|
621 if (record.getFunction() == NULL)
|
|
|
622 {
|
|
|
623 throw InternalException("Lambda: No function in the given record");
|
|
|
624 }
|
|
|
625 dataStack.push_front(Binding(new Closure(record.getEnvironment(),
|
|
|
626 *(record.getFunction()),
|
|
|
627 record.getPosition(),
|
|
|
628 record.getDirection())));
|
|
|
629 record.setDirection(Dir::back(record.getDirection()));
|
|
|
630 }
|
|
|
631 };
|
|
|
632
|
|
|
633 class End : public Action
|
|
|
634 {
|
|
|
635 public:
|
|
|
636 static End v;
|
|
|
637 virtual void run(std::list<Binding> & dataStack,
|
|
|
638 std::list<ActivationRecord> & programStack,
|
|
|
639 std::map<std::string, Board> &)
|
|
|
640 {
|
|
|
641 programStack.pop_front();
|
|
|
642 }
|
|
|
643 };
|
|
|
644
|
|
|
645 #endif
|
