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1 /* |
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2 |
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_tree_cmd_h) |
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24 #define octave_tree_cmd_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 class ostream; |
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31 |
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32 class octave_value_list; |
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33 |
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34 class tree_statement_list; |
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35 class tree_global_init_list; |
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36 class tree_if_command_list; |
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37 class tree_expression; |
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38 class tree_index_expression; |
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39 class tree_identifier; |
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40 class tree_return_list; |
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41 class octave_value; |
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42 class symbol_record; |
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43 |
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44 class tree_command; |
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45 class tree_global_command; |
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46 class tree_while_command; |
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47 class tree_for_command; |
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48 class tree_if_command; |
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49 class tree_try_catch_command; |
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50 class tree_unwind_protect_command; |
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51 class tree_break_command; |
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52 class tree_continue_command; |
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53 class tree_return_command; |
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54 |
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55 class tree_walker; |
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56 |
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57 #include "pt-base.h" |
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58 |
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59 // A base class for commands. |
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60 |
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61 class |
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62 tree_command : public tree |
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63 { |
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64 public: |
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65 |
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66 tree_command (int l = -1, int c = -1) : tree (l, c) { } |
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67 |
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68 virtual ~tree_command (void) { } |
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69 |
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70 virtual void eval (void) = 0; |
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71 }; |
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72 |
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73 class |
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74 tree_global_command : public tree_command |
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75 { |
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76 public: |
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77 |
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78 tree_global_command (int l = -1, int c = -1) |
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79 : tree_command (l, c), init_list (0) { } |
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80 |
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81 tree_global_command (tree_global_init_list *t, int l = -1, int c = -1) |
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82 : tree_command (l, c), init_list (t) { } |
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83 |
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84 ~tree_global_command (void); |
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85 |
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86 void eval (void); |
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87 |
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88 tree_global_init_list *initializer_list (void) { return init_list; } |
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89 |
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90 void accept (tree_walker& tw); |
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91 |
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92 private: |
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93 |
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94 // The list of global variables or initializers in this global |
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95 // command. |
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96 tree_global_init_list *init_list; |
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97 }; |
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98 |
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99 // While. |
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100 |
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101 class |
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102 tree_while_command : public tree_command |
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103 { |
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104 public: |
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105 |
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106 tree_while_command (int l = -1, int c = -1) |
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107 : tree_command (l, c), expr (0), list (0) { } |
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108 |
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109 tree_while_command (tree_expression *e, int l = -1, int c = -1) |
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110 : tree_command (l, c), expr (e), list (0) { } |
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111 |
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112 tree_while_command (tree_expression *e, tree_statement_list *lst, |
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113 int l = -1, int c = -1) |
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114 : tree_command (l, c), expr (e), list (lst) { } |
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115 |
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116 ~tree_while_command (void); |
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117 |
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118 void eval (void); |
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119 |
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120 void eval_error (void); |
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121 |
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122 tree_expression *condition (void) { return expr; } |
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123 |
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124 tree_statement_list *body (void) { return list; } |
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125 |
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126 void accept (tree_walker& tw); |
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127 |
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128 private: |
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129 |
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130 // Expression to test. |
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131 tree_expression *expr; |
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132 |
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133 // List of commands to execute. |
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134 tree_statement_list *list; |
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135 }; |
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136 |
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137 // For. |
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138 |
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139 class |
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140 tree_for_command : public tree_command |
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141 { |
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142 public: |
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143 |
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144 tree_for_command (int l = -1, int c = -1) |
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145 : tree_command (l, c), id (0), id_list (0), expr (0), list (0) { } |
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146 |
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147 tree_for_command (tree_index_expression *ident, tree_expression *e, |
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148 tree_statement_list *lst, int l = -1, int c = -1) |
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149 : tree_command (l, c), id (ident), id_list (0), expr (e), |
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150 list (lst) { } |
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151 |
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152 tree_for_command (tree_return_list *ident, tree_expression *e, |
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153 tree_statement_list *lst, int l = -1, int c = -1) |
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154 : tree_command (l, c), id (0), id_list (ident), expr (e), |
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155 list (lst) { } |
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156 |
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157 ~tree_for_command (void); |
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158 |
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159 void eval (void); |
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160 |
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161 void eval_error (void); |
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162 |
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163 tree_index_expression *ident (void) { return id; } |
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164 |
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165 tree_expression *control_expr (void) { return expr; } |
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166 |
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167 tree_statement_list *body (void) { return list; } |
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168 |
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169 void accept (tree_walker& tw); |
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170 |
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171 private: |
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172 |
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173 // Identifier to modify. |
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174 tree_index_expression *id; |
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175 |
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176 // List of identifiers to modify. |
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177 tree_return_list *id_list; |
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178 |
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179 // Expression to evaluate. |
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180 tree_expression *expr; |
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181 |
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182 // List of commands to execute. |
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183 tree_statement_list *list; |
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184 |
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185 void do_for_loop_once (tree_return_list *lst, |
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186 const octave_value_list& rhs, bool& quit); |
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187 |
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188 void do_for_loop_once (tree_index_expression *idx_expr, |
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189 const octave_value& rhs, bool& quit); |
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190 |
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191 void do_for_loop_once (tree_identifier *ident, |
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192 octave_value& rhs, bool& quit); |
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193 }; |
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194 |
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195 // If. |
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196 |
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197 class |
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198 tree_if_command : public tree_command |
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199 { |
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200 public: |
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201 |
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202 tree_if_command (int l = -1, int c = -1) |
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203 : tree_command (l, c), list (0) { } |
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204 |
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205 tree_if_command (tree_if_command_list *lst, int l = -1, int c = -1) |
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206 : tree_command (l, c), list (lst) { } |
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207 |
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208 ~tree_if_command (void); |
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209 |
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210 void eval (void); |
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211 |
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212 void eval_error (void); |
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213 |
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214 tree_if_command_list *cmd_list (void) { return list; } |
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215 |
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216 void accept (tree_walker& tw); |
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217 |
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218 private: |
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219 |
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220 // List of if commands (if, elseif, elseif, ... else, endif) |
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221 tree_if_command_list *list; |
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222 }; |
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223 |
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224 // Simple exception handling. |
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225 |
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226 class |
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227 tree_unwind_protect_command : public tree_command |
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228 { |
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229 public: |
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230 |
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231 tree_unwind_protect_command (int l = -1, int c = -1) |
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232 : tree_command (l, c), unwind_protect_code (0), cleanup_code (0) { } |
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233 |
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234 tree_unwind_protect_command (tree_statement_list *tc, |
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235 tree_statement_list *cc, |
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236 int l = -1, int c = -1) |
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237 : tree_command (l, c), unwind_protect_code (tc), cleanup_code (cc) { } |
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238 |
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239 ~tree_unwind_protect_command (void); |
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240 |
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241 void eval (void); |
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242 |
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243 tree_statement_list *body (void) { return unwind_protect_code; } |
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244 |
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245 tree_statement_list *cleanup (void) { return cleanup_code; } |
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246 |
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247 void accept (tree_walker& tw); |
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248 |
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249 private: |
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250 |
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251 // The first body of code to attempt to execute. |
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252 tree_statement_list *unwind_protect_code; |
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253 |
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254 // The body of code to execute no matter what happens in the first |
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255 // body of code. |
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256 tree_statement_list *cleanup_code; |
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257 }; |
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258 |
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259 // Simple exception handling. |
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260 |
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261 class |
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262 tree_try_catch_command : public tree_command |
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263 { |
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264 public: |
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265 |
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266 tree_try_catch_command (int l = -1, int c = -1) |
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267 : tree_command (l, c), try_code (0), catch_code (0) { } |
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268 |
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269 tree_try_catch_command (tree_statement_list *tc, |
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270 tree_statement_list *cc, |
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271 int l = -1, int c = -1) |
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272 : tree_command (l, c), try_code (tc), catch_code (cc) { } |
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273 |
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274 ~tree_try_catch_command (void); |
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275 |
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276 void eval (void); |
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277 |
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278 tree_statement_list *body (void) { return try_code; } |
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279 |
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280 tree_statement_list *cleanup (void) { return catch_code; } |
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281 |
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282 void accept (tree_walker& tw); |
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283 |
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284 private: |
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285 |
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286 // The first block of code to attempt to execute. |
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287 tree_statement_list *try_code; |
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288 |
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289 // The code to execute if an error occurs in the first block. |
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290 tree_statement_list *catch_code; |
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291 }; |
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292 |
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293 // Break. |
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294 |
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295 class |
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296 tree_break_command : public tree_command |
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297 { |
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298 public: |
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299 |
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300 tree_break_command (int l = -1, int c = -1) : tree_command (l, c) { } |
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301 |
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302 ~tree_break_command (void) { } |
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303 |
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304 void eval (void); |
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305 |
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306 void accept (tree_walker& tw); |
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307 }; |
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308 |
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309 // Continue. |
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310 |
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311 class |
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312 tree_continue_command : public tree_command |
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313 { |
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314 public: |
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315 |
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316 tree_continue_command (int l = -1, int c = -1) : tree_command (l, c) { } |
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317 |
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318 ~tree_continue_command (void) { } |
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319 |
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320 void eval (void); |
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321 |
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322 void accept (tree_walker& tw); |
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323 }; |
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324 |
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325 // Return. |
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326 |
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327 class |
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328 tree_return_command : public tree_command |
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329 { |
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330 public: |
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331 |
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332 tree_return_command (int l = -1, int c = -1) : tree_command (l, c) { } |
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333 |
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334 ~tree_return_command (void) { } |
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335 |
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336 void eval (void); |
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337 |
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338 void accept (tree_walker& tw); |
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339 }; |
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340 |
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341 #endif |
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342 |
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343 /* |
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344 ;;; Local Variables: *** |
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345 ;;; mode: C++ *** |
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346 ;;; End: *** |
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347 */ |
