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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 class expression; |
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27 class tree_statement_list; |
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28 |
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29 class tree_walker; |
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30 |
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31 #include "base-list.h" |
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32 #include "comment-list.h" |
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33 #include "pt-cmd.h" |
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34 |
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35 // If. |
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36 |
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37 class |
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38 tree_if_clause |
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39 { |
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40 public: |
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41 |
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42 tree_if_clause (void) |
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43 : expr (0), list (0), lead_comm (0) { } |
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44 |
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45 tree_if_clause (tree_statement_list *l, octave_comment_list *lc = 0) |
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46 : expr (0), list (l), lead_comm (lc) { } |
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47 |
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48 tree_if_clause (tree_expression *e, tree_statement_list *l, |
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49 octave_comment_list *lc = 0) |
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50 : expr (e), list (l), lead_comm (lc) { } |
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51 |
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52 ~tree_if_clause (void); |
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53 |
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54 bool is_else_clause (void) |
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55 { return ! expr; } |
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56 |
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57 int eval (void); |
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58 |
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59 tree_expression *condition (void) { return expr; } |
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60 |
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61 tree_statement_list *commands (void) { return list; } |
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62 |
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63 octave_comment_list *leading_comment (void) { return lead_comm; } |
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64 |
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65 void accept (tree_walker& tw); |
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66 |
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67 private: |
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68 |
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69 // The condition to test. |
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70 tree_expression *expr; |
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71 |
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72 // The list of statements to evaluate if expr is true. |
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73 tree_statement_list *list; |
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74 |
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75 // Comment preceding ELSE or ELSEIF token. |
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76 octave_comment_list *lead_comm; |
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77 |
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78 // No copying! |
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79 |
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80 tree_if_clause (const tree_if_clause&); |
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81 |
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82 tree_if_clause& operator = (const tree_if_clause&); |
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83 }; |
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84 |
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85 class |
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86 tree_if_command_list : public octave_base_list<tree_if_clause *> |
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87 { |
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88 public: |
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89 |
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90 tree_if_command_list (void) { } |
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91 |
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92 tree_if_command_list (tree_if_clause *t) { append (t); } |
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93 |
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94 ~tree_if_command_list (void) |
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95 { |
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96 while (! empty ()) |
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97 { |
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98 iterator p = begin (); |
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99 delete *p; |
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100 erase (p); |
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101 } |
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102 } |
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103 |
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104 void eval (void); |
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105 |
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106 void accept (tree_walker& tw); |
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107 |
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108 private: |
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109 |
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110 // No copying! |
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111 |
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112 tree_if_command_list (const tree_if_command_list&); |
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113 |
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114 tree_if_command_list& operator = (const tree_if_command_list&); |
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115 }; |
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116 |
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117 class |
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118 tree_if_command : public tree_command |
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119 { |
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120 public: |
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121 |
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122 tree_if_command (int l = -1, int c = -1) |
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123 : tree_command (l, c), list (0), lead_comm (0), trail_comm (0) { } |
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124 |
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125 tree_if_command (tree_if_command_list *lst, octave_comment_list *lc, |
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126 octave_comment_list *tc, int l = -1, int c = -1) |
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127 : tree_command (l, c), list (lst), lead_comm (lc), trail_comm (tc) { } |
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128 |
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129 ~tree_if_command (void); |
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130 |
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131 void eval (void); |
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132 |
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133 tree_if_command_list *cmd_list (void) { return list; } |
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134 |
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135 octave_comment_list *leading_comment (void) { return lead_comm; } |
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136 |
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137 octave_comment_list *trailing_comment (void) { return trail_comm; } |
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138 |
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139 void accept (tree_walker& tw); |
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140 |
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141 private: |
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142 |
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143 // List of if commands (if, elseif, elseif, ... else, endif) |
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144 tree_if_command_list *list; |
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145 |
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146 // Comment preceding IF token. |
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147 octave_comment_list *lead_comm; |
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148 |
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149 // Comment preceding ENDIF token. |
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150 octave_comment_list *trail_comm; |
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151 |
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152 // No copying! |
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153 |
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154 tree_if_command (const tree_if_command&); |
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155 |
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156 tree_if_command& operator = (const tree_if_command&); |
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157 }; |
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158 |
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159 // Switch. |
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160 |
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161 class |
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162 tree_switch_case |
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163 { |
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164 public: |
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165 |
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166 tree_switch_case (void) |
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167 : label (0), list (0), lead_comm (0) { } |
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168 |
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169 tree_switch_case (tree_statement_list *l, octave_comment_list *lc = 0) |
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170 : label (0), list (l), lead_comm (lc) { } |
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171 |
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172 tree_switch_case (tree_expression *e, tree_statement_list *l, |
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173 octave_comment_list *lc = 0) |
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174 : label (e), list (l), lead_comm (lc) { } |
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175 |
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176 ~tree_switch_case (void); |
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177 |
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178 bool is_default_case (void) { return ! label; } |
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179 |
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180 bool label_matches (const octave_value& val); |
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181 |
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182 int eval (const octave_value& val); |
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183 |
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184 void eval_error (void); |
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185 |
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186 tree_expression *case_label (void) { return label; } |
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187 |
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188 tree_statement_list *commands (void) { return list; } |
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189 |
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190 octave_comment_list *leading_comment (void) { return lead_comm; } |
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191 |
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192 void accept (tree_walker& tw); |
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193 |
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194 private: |
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195 |
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196 // The case label. |
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197 tree_expression *label; |
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198 |
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199 // The list of statements to evaluate if the label matches. |
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200 tree_statement_list *list; |
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201 |
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202 // Comment preceding CASE or OTHERWISE token. |
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203 octave_comment_list *lead_comm; |
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204 |
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205 // No copying! |
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206 |
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207 tree_switch_case (const tree_switch_case&); |
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208 |
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209 tree_switch_case& operator = (const tree_switch_case&); |
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210 }; |
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211 |
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212 class |
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213 tree_switch_case_list : public octave_base_list<tree_switch_case *> |
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214 { |
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215 public: |
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216 |
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217 tree_switch_case_list (void) { } |
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218 |
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219 tree_switch_case_list (tree_switch_case *t) { append (t); } |
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220 |
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221 ~tree_switch_case_list (void) |
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222 { |
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223 while (! empty ()) |
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224 { |
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225 iterator p = begin (); |
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226 delete *p; |
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227 erase (p); |
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228 } |
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229 } |
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230 |
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231 void eval (const octave_value& val); |
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232 |
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233 void accept (tree_walker& tw); |
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234 |
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235 private: |
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236 |
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237 // No copying! |
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238 |
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239 tree_switch_case_list (const tree_switch_case_list&); |
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240 |
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241 tree_switch_case_list& operator = (const tree_switch_case_list&); |
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242 }; |
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243 |
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244 class |
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245 tree_switch_command : public tree_command |
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246 { |
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247 public: |
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248 |
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249 tree_switch_command (int l = -1, int c = -1) |
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250 : tree_command (l, c), expr (0), list (0), lead_comm (0), |
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251 trail_comm (0) { } |
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252 |
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253 tree_switch_command (tree_expression *e, tree_switch_case_list *lst, |
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254 octave_comment_list *lc, octave_comment_list *tc, |
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255 int l = -1, int c = -1) |
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256 : tree_command (l, c), expr (e), list (lst), lead_comm (lc), |
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257 trail_comm (tc) { } |
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258 |
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259 ~tree_switch_command (void); |
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260 |
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261 void eval (void); |
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262 |
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263 void eval_error (void); |
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264 |
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265 tree_expression *switch_value (void) { return expr; } |
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266 |
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267 tree_switch_case_list *case_list (void) { return list; } |
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268 |
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269 octave_comment_list *leading_comment (void) { return lead_comm; } |
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270 |
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271 octave_comment_list *trailing_comment (void) { return trail_comm; } |
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272 |
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273 void accept (tree_walker& tw); |
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274 |
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275 private: |
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276 |
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277 // Value on which to switch. |
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278 tree_expression *expr; |
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279 |
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280 // List of cases (case 1, case 2, ..., default) |
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281 tree_switch_case_list *list; |
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282 |
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283 // Comment preceding SWITCH token. |
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284 octave_comment_list *lead_comm; |
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285 |
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286 // Comment preceding ENDSWITCH token. |
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287 octave_comment_list *trail_comm; |
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288 |
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289 // No copying! |
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290 |
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291 tree_switch_command (const tree_switch_command&); |
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292 |
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293 tree_switch_command& operator = (const tree_switch_command&); |
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294 }; |
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295 |
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296 #endif |
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297 |
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298 /* |
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299 ;;; Local Variables: *** |
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300 ;;; mode: C++ *** |
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301 ;;; End: *** |
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302 */ |
