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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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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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 "comment-list.h" |
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38 #include "pt-cmd.h" |
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39 |
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40 // If. |
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41 |
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42 class |
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43 tree_if_clause |
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44 { |
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45 public: |
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46 |
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47 tree_if_clause (void) |
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48 : expr (0), list (0), lead_comm (0) { } |
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49 |
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50 tree_if_clause (tree_statement_list *l, octave_comment_list *lc = 0) |
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51 : expr (0), list (l), lead_comm (lc) { } |
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52 |
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53 tree_if_clause (tree_expression *e, tree_statement_list *l, |
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54 octave_comment_list *lc = 0) |
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55 : expr (e), list (l), lead_comm (lc) { } |
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56 |
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57 ~tree_if_clause (void); |
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58 |
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59 bool is_else_clause (void) |
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60 { return ! expr; } |
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61 |
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62 int eval (void); |
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63 |
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64 tree_expression *condition (void) { return expr; } |
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65 |
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66 tree_statement_list *commands (void) { return list; } |
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67 |
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68 octave_comment_list *leading_comment (void) { return lead_comm; } |
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69 |
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70 void accept (tree_walker& tw); |
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71 |
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72 private: |
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73 |
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74 // The condition to test. |
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75 tree_expression *expr; |
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76 |
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77 // The list of statements to evaluate if expr is true. |
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78 tree_statement_list *list; |
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79 |
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80 // Comment preceding ELSE or ELSEIF token. |
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81 octave_comment_list *lead_comm; |
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82 |
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83 // No copying! |
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84 |
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85 tree_if_clause (const tree_if_clause&); |
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86 |
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87 tree_if_clause& operator = (const tree_if_clause&); |
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88 }; |
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89 |
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90 class |
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91 tree_if_command_list |
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92 { |
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93 public: |
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94 |
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95 tree_if_command_list (void) |
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96 : lst () { } |
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97 |
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98 tree_if_command_list (tree_if_clause *t) |
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99 : lst () { lst.append (t); } |
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100 |
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101 ~tree_if_command_list (void) |
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102 { |
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103 while (! lst.empty ()) |
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104 { |
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105 tree_if_clause *t = lst.remove_front (); |
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106 delete t; |
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107 } |
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108 } |
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109 |
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110 void append (tree_if_clause *&s) { lst.append (s); } |
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111 void append (tree_if_clause * const &s) { lst.append (s); } |
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112 |
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113 tree_if_clause *&operator () (Pix p) { return lst (p); } |
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114 |
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115 tree_if_clause * const &operator () (Pix p) const { return lst (p); } |
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116 |
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117 Pix first (void) const { return lst.first (); } |
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118 |
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119 void next (Pix& p) const { return lst.next (p); } |
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120 |
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121 void eval (void); |
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122 |
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123 void accept (tree_walker& tw); |
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124 |
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125 private: |
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126 |
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127 // The list of if/elseif clauses. |
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128 SLList<tree_if_clause *> lst; |
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129 |
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130 // No copying! |
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131 |
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132 tree_if_command_list (const tree_if_command_list&); |
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133 |
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134 tree_if_command_list& operator = (const tree_if_command_list&); |
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135 }; |
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136 |
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137 class |
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138 tree_if_command : public tree_command |
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139 { |
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140 public: |
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141 |
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142 tree_if_command (int l = -1, int c = -1) |
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143 : tree_command (l, c), list (0), lead_comm (0), trail_comm (0) { } |
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144 |
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145 tree_if_command (tree_if_command_list *lst, octave_comment_list *lc, |
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146 octave_comment_list *tc, int l = -1, int c = -1) |
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147 : tree_command (l, c), list (lst), lead_comm (lc), trail_comm (tc) { } |
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148 |
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149 ~tree_if_command (void); |
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150 |
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151 void eval (void); |
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152 |
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153 tree_if_command_list *cmd_list (void) { return list; } |
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154 |
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155 octave_comment_list *leading_comment (void) { return lead_comm; } |
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156 |
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157 octave_comment_list *trailing_comment (void) { return trail_comm; } |
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158 |
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159 void accept (tree_walker& tw); |
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160 |
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161 private: |
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162 |
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163 // List of if commands (if, elseif, elseif, ... else, endif) |
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164 tree_if_command_list *list; |
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165 |
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166 // Comment preceding IF token. |
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167 octave_comment_list *lead_comm; |
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168 |
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169 // Comment preceding ENDIF token. |
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170 octave_comment_list *trail_comm; |
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171 |
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172 // No copying! |
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173 |
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174 tree_if_command (const tree_if_command&); |
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175 |
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176 tree_if_command& operator = (const tree_if_command&); |
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177 }; |
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178 |
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179 // Switch. |
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180 |
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181 class |
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182 tree_switch_case |
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183 { |
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184 public: |
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185 |
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186 tree_switch_case (void) |
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187 : label (0), list (0), lead_comm (0) { } |
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188 |
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189 tree_switch_case (tree_statement_list *l, octave_comment_list *lc = 0) |
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190 : label (0), list (l), lead_comm (lc) { } |
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191 |
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192 tree_switch_case (tree_expression *e, tree_statement_list *l, |
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193 octave_comment_list *lc = 0) |
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194 : label (e), list (l), lead_comm (lc) { } |
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195 |
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196 ~tree_switch_case (void); |
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197 |
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198 bool is_default_case (void) { return ! label; } |
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199 |
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200 bool label_matches (const octave_value& val); |
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201 |
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202 int eval (const octave_value& val); |
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203 |
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204 void eval_error (void); |
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205 |
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206 tree_expression *case_label (void) { return label; } |
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207 |
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208 tree_statement_list *commands (void) { return list; } |
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209 |
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210 octave_comment_list *leading_comment (void) { return lead_comm; } |
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211 |
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212 void accept (tree_walker& tw); |
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213 |
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214 private: |
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215 |
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216 // The case label. |
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217 tree_expression *label; |
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218 |
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219 // The list of statements to evaluate if the label matches. |
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220 tree_statement_list *list; |
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221 |
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222 // Comment preceding CASE or OTHERWISE token. |
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223 octave_comment_list *lead_comm; |
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224 |
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225 // No copying! |
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226 |
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227 tree_switch_case (const tree_switch_case&); |
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228 |
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229 tree_switch_case& operator = (const tree_switch_case&); |
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230 }; |
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231 |
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232 class |
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233 tree_switch_case_list |
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234 { |
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235 public: |
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236 |
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237 tree_switch_case_list (void) |
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238 : lst () { } |
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239 |
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240 tree_switch_case_list (tree_switch_case *t) |
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241 : lst () { lst.append (t); } |
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242 |
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243 ~tree_switch_case_list (void) |
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244 { |
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245 while (! lst.empty ()) |
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246 { |
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247 tree_switch_case *t = lst.remove_front (); |
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248 delete t; |
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249 } |
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250 } |
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251 |
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252 void append (tree_switch_case *&s) { lst.append (s); } |
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253 void append (tree_switch_case * const &s) { lst.append (s); } |
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254 |
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255 tree_switch_case *&operator () (Pix p) { return lst (p); } |
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256 |
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257 tree_switch_case * const &operator () (Pix p) const { return lst (p); } |
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258 |
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259 Pix first (void) const { return lst.first (); } |
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260 |
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261 void next (Pix& p) const { return lst.next (p); } |
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262 |
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263 void eval (const octave_value& val); |
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264 |
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265 void accept (tree_walker& tw); |
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266 |
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267 private: |
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268 |
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269 // The list of switch cases. |
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270 SLList<tree_switch_case *> lst; |
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271 |
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272 // No copying! |
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273 |
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274 tree_switch_case_list (const tree_switch_case_list&); |
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275 |
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276 tree_switch_case_list& operator = (const tree_switch_case_list&); |
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277 }; |
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278 |
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279 class |
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280 tree_switch_command : public tree_command |
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281 { |
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282 public: |
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283 |
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284 tree_switch_command (int l = -1, int c = -1) |
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285 : tree_command (l, c), expr (0), list (0), lead_comm (0), |
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286 trail_comm (0) { } |
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287 |
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288 tree_switch_command (tree_expression *e, tree_switch_case_list *lst, |
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289 octave_comment_list *lc, octave_comment_list *tc, |
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290 int l = -1, int c = -1) |
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291 : tree_command (l, c), expr (e), list (lst), lead_comm (lc), |
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292 trail_comm (tc) { } |
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293 |
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294 ~tree_switch_command (void); |
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295 |
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296 void eval (void); |
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297 |
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298 void eval_error (void); |
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299 |
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300 tree_expression *switch_value (void) { return expr; } |
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301 |
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302 tree_switch_case_list *case_list (void) { return list; } |
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303 |
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304 octave_comment_list *leading_comment (void) { return lead_comm; } |
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305 |
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306 octave_comment_list *trailing_comment (void) { return trail_comm; } |
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307 |
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308 void accept (tree_walker& tw); |
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309 |
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310 private: |
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311 |
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312 // Value on which to switch. |
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313 tree_expression *expr; |
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314 |
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315 // List of cases (case 1, case 2, ..., default) |
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316 tree_switch_case_list *list; |
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317 |
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318 // Comment preceding SWITCH token. |
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319 octave_comment_list *lead_comm; |
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320 |
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321 // Comment preceding ENDSWITCH token. |
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322 octave_comment_list *trail_comm; |
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323 |
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324 // No copying! |
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325 |
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326 tree_switch_command (const tree_switch_command&); |
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327 |
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328 tree_switch_command& operator = (const tree_switch_command&); |
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329 }; |
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330 |
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331 #endif |
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332 |
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333 /* |
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334 ;;; Local Variables: *** |
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335 ;;; mode: C++ *** |
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336 ;;; End: *** |
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337 */ |
