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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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_select_h) |
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24 #define octave_tree_select_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 #include <SLList.h> |
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31 |
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32 class expression; |
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33 class tree_statement_list; |
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34 |
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35 class tree_walker; |
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36 |
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37 #include "pt-cmd.h" |
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38 |
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39 // If. |
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40 |
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41 class |
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42 tree_if_clause |
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43 { |
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44 public: |
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45 |
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46 tree_if_clause (void) |
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47 : expr (0), list (0) { } |
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48 |
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49 tree_if_clause (tree_statement_list *l) |
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50 : expr (0), list (l) { } |
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51 |
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52 tree_if_clause (tree_expression *e, tree_statement_list *l) |
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53 : expr (e), list (l) { } |
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54 |
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55 ~tree_if_clause (void); |
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56 |
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57 bool is_else_clause (void) |
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58 { return ! expr; } |
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59 |
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60 int eval (void); |
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61 |
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62 tree_expression *condition (void) { return expr; } |
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63 |
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64 tree_statement_list *commands (void) { return list; } |
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65 |
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66 void accept (tree_walker& tw); |
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67 |
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68 private: |
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69 |
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70 // The condition to test. |
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71 tree_expression *expr; |
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72 |
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73 // The list of statements to evaluate if expr is true. |
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74 tree_statement_list *list; |
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75 }; |
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76 |
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77 class |
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78 tree_if_command_list : public SLList<tree_if_clause *> |
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79 { |
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80 public: |
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81 |
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82 tree_if_command_list (void) |
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83 : SLList<tree_if_clause *> () { } |
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84 |
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85 tree_if_command_list (tree_if_clause *t) |
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86 : SLList<tree_if_clause *> () { append (t); } |
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87 |
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88 ~tree_if_command_list (void) |
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89 { |
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90 while (! empty ()) |
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91 { |
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92 tree_if_clause *t = remove_front (); |
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93 delete t; |
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94 } |
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95 } |
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96 |
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97 void eval (void); |
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98 |
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99 void accept (tree_walker& tw); |
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100 }; |
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101 |
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102 class |
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103 tree_if_command : public tree_command |
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104 { |
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105 public: |
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106 |
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107 tree_if_command (int l = -1, int c = -1) |
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108 : tree_command (l, c), list (0) { } |
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109 |
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110 tree_if_command (tree_if_command_list *lst, int l = -1, int c = -1) |
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111 : tree_command (l, c), list (lst) { } |
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112 |
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113 ~tree_if_command (void); |
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114 |
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115 void eval (void); |
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116 |
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117 tree_if_command_list *cmd_list (void) { return list; } |
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118 |
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119 void accept (tree_walker& tw); |
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120 |
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121 private: |
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122 |
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123 // List of if commands (if, elseif, elseif, ... else, endif) |
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124 tree_if_command_list *list; |
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125 }; |
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126 |
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127 // Switch. |
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128 |
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129 class |
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130 tree_switch_case |
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131 { |
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132 public: |
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133 |
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134 tree_switch_case (void) |
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135 : label (0), list (0) { } |
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136 |
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137 tree_switch_case (tree_statement_list *l) |
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138 : label (0), list (l) { } |
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139 |
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140 tree_switch_case (tree_expression *e, tree_statement_list *l) |
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141 : label (e), list (l) { } |
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142 |
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143 ~tree_switch_case (void); |
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144 |
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145 bool is_default_case (void) |
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146 { return ! label; } |
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147 |
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148 bool label_matches (const octave_value& val); |
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149 |
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150 int eval (const octave_value& val); |
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151 |
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152 void eval_error (void); |
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153 |
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154 tree_expression *case_label (void) { return label; } |
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155 |
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156 tree_statement_list *commands (void) { return list; } |
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157 |
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158 void accept (tree_walker& tw); |
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159 |
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160 private: |
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161 |
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162 // The case label. |
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163 tree_expression *label; |
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164 |
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165 // The list of statements to evaluate if the label matches. |
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166 tree_statement_list *list; |
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167 }; |
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168 |
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169 class |
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170 tree_switch_case_list : public SLList<tree_switch_case *> |
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171 { |
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172 public: |
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173 |
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174 tree_switch_case_list (void) |
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175 : SLList<tree_switch_case *> () { } |
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176 |
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177 tree_switch_case_list (tree_switch_case *t) |
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178 : SLList<tree_switch_case *> () { append (t); } |
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179 |
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180 ~tree_switch_case_list (void) |
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181 { |
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182 while (! empty ()) |
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183 { |
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184 tree_switch_case *t = remove_front (); |
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185 delete t; |
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186 } |
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187 } |
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188 |
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189 void eval (const octave_value& val); |
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190 |
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191 void accept (tree_walker& tw); |
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192 }; |
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193 |
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194 class |
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195 tree_switch_command : public tree_command |
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196 { |
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197 public: |
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198 |
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199 tree_switch_command (int l = -1, int c = -1) |
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200 : tree_command (l, c), expr (0), list (0) { } |
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201 |
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202 tree_switch_command (tree_expression *e, tree_switch_case_list *lst, |
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203 int l = -1, int c = -1) |
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204 : tree_command (l, c), expr (e), list (lst) { } |
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205 |
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206 ~tree_switch_command (void); |
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207 |
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208 void eval (void); |
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209 |
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210 void eval_error (void); |
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211 |
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212 tree_expression *switch_value (void) { return expr; } |
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213 |
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214 tree_switch_case_list *case_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 // Value on which to switch. |
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221 tree_expression *expr; |
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222 |
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223 // List of cases (case 1, case 2, ..., default) |
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224 tree_switch_case_list *list; |
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225 }; |
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226 |
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227 #endif |
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228 |
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229 /* |
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230 ;;; Local Variables: *** |
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231 ;;; mode: C++ *** |
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232 ;;; End: *** |
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233 */ |
