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1 // Tree classes. -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_tree_cmd_h) |
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25 #define octave_tree_cmd_h 1 |
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26 |
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27 #if defined (__GNUG__) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 class tree_expression; |
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32 class tree_index_expression; |
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33 class tree_constant; |
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34 class symbol_record; |
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35 |
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36 class tree_command; |
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37 class tree_command_list; |
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38 class tree_global_command; |
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39 class tree_while_command; |
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40 class tree_for_command; |
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41 class tree_if_command; |
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42 class tree_break_command; |
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43 class tree_continue_command; |
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44 class tree_return_command; |
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45 |
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46 /* |
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47 * A base class for commands. |
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48 */ |
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49 class |
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50 tree_command : public tree |
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51 { |
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52 }; |
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53 |
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54 /* |
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55 * A command or two to be executed. |
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56 */ |
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57 class |
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58 tree_command_list : public tree_command |
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59 { |
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60 public: |
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61 tree_command_list (void); |
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62 tree_command_list (tree *t); |
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63 |
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64 ~tree_command_list (void); |
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65 |
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66 tree_command_list *chain (tree *t); |
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67 tree_command_list *reverse (void); |
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68 |
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69 void set_print_flag (int print); |
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70 |
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71 tree_constant eval (int print); |
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72 |
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73 private: |
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74 tree *command; // Command to execute. |
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75 int print_flag; // Print result of eval for this command? |
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76 tree_command_list *next; // Next command in list. |
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77 }; |
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78 |
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79 /* |
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80 * Global. |
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81 */ |
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82 class |
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83 tree_global_command : public tree_command |
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84 { |
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85 public: |
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86 tree_global_command (int l = -1, int c = -1); |
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87 tree_global_command (symbol_record *s, int l = -1, int c = -1); |
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88 tree_global_command (symbol_record *s, tree_expression *e, |
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89 int l = -1, int c = -1); |
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90 |
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91 ~tree_global_command (void); |
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92 |
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93 tree_global_command *chain (symbol_record *s, int l = -1, int c = -1); |
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94 tree_global_command *chain (symbol_record *s, tree_expression *e, |
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95 int l = -1, int c = -1); |
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96 tree_global_command *reverse (void); |
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97 |
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98 tree_constant eval (int print); |
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99 |
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100 void eval_error (void); |
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101 |
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102 private: |
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103 symbol_record *sr; // Symbol record from local symbol table. |
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104 tree_expression *rhs; // RHS of assignment. |
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105 tree_global_command *next; // Next global command. |
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106 }; |
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107 |
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108 /* |
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109 * While. |
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110 */ |
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111 class |
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112 tree_while_command : public tree_command |
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113 { |
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114 public: |
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115 tree_while_command (int l = -1, int c = -1); |
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116 tree_while_command (tree_expression *e, int l = -1, int c = -1); |
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117 tree_while_command (tree_expression *e, tree *lst, int l = -1, int c = -1); |
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118 |
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119 ~tree_while_command (void); |
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120 |
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121 tree_constant eval (int print); |
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122 |
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123 void eval_error (void); |
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124 |
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125 private: |
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126 tree_expression *expr; // Expression to test. |
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127 tree *list; // List of commands to execute. |
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128 }; |
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129 |
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130 /* |
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131 * For. |
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132 */ |
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133 class |
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134 tree_for_command : public tree_command |
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135 { |
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136 public: |
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137 tree_for_command (int l = -1, int c = -1); |
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138 tree_for_command (tree_index_expression *id, tree_expression *e, tree *lst, |
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139 int l = -1, int c = -1); |
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140 |
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141 ~tree_for_command (void); |
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142 |
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143 tree_constant eval (int print); |
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144 |
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145 void eval_error (void); |
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146 |
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147 private: |
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148 tree_constant do_for_loop_once (tree_constant *rhs, int& quit); |
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149 |
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150 tree_index_expression *id; // Identifier to modify. |
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151 tree_expression *expr; // Expression to evaluate. |
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152 tree *list; // List of commands to execute. |
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153 }; |
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154 |
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155 /* |
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156 * Simple if. |
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157 */ |
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158 class |
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159 tree_if_command : public tree_command |
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160 { |
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161 public: |
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162 tree_if_command (int l = -1, int c = -1); |
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163 tree_if_command (tree *lst, int l = -1, int c = -1); |
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164 tree_if_command (tree_expression *e, tree *lst, int l = -1, int c = -1); |
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165 |
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166 ~tree_if_command (void); |
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167 |
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168 tree_if_command *chain (tree *lst, int l = -1, int c = -1); |
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169 tree_if_command *chain (tree_expression *e, tree *lst, int l = -1, |
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170 int c = -1); |
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171 tree_if_command *reverse (void); |
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172 |
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173 tree_constant eval (int print); |
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174 |
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175 void eval_error (void); |
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176 |
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177 private: |
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178 tree_expression *expr; // Expression to test. |
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179 tree *list; // Commands to execute. |
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180 tree_if_command *next; // Next if command. |
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181 }; |
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182 |
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183 /* |
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184 * Break. |
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185 */ |
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186 class |
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187 tree_break_command : public tree_command |
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188 { |
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189 public: |
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190 tree_break_command (int l = -1, int c = -1); |
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191 |
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192 ~tree_break_command (void); |
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193 |
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194 tree_constant eval (int print); |
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195 }; |
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196 |
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197 /* |
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198 * Continue. |
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199 */ |
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200 class |
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201 tree_continue_command : public tree_command |
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202 { |
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203 public: |
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204 tree_continue_command (int l = -1, int c = -1); |
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205 |
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206 ~tree_continue_command (void); |
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207 |
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208 tree_constant eval (int print); |
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209 }; |
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210 |
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211 /* |
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212 * Return. |
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213 */ |
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214 class |
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215 tree_return_command : public tree_command |
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216 { |
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217 public: |
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218 tree_return_command (int l = -1, int c = -1); |
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219 |
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220 ~tree_return_command (void); |
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221 |
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222 tree_constant eval (int print); |
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223 }; |
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224 |
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225 #endif |
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226 |
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227 /* |
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228 ;;; Local Variables: *** |
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229 ;;; mode: C++ *** |
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230 ;;; page-delimiter: "^/\\*" *** |
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231 ;;; End: *** |
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232 */ |
