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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_misc_h) |
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24 #define octave_tree_misc_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 class octave_value; |
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34 class tree_command; |
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35 class tree_expression; |
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36 class tree_simple_assignment_expression; |
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37 class tree_index_expression; |
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38 class tree_identifier; |
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39 class symbol_record; |
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40 class symbol_table; |
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41 |
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42 class tree_statement; |
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43 class tree_statement_list; |
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44 class tree_argument_list; |
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45 class tree_parameter_list; |
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46 class tree_return_list; |
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47 class tree_va_return_list; |
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48 class tree_global; |
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49 class tree_global_init_list; |
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50 |
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51 class tree_walker; |
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52 |
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53 #include <SLList.h> |
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54 |
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55 #include "pt-base.h" |
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56 |
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57 // A statement is either a command to execute or an expression to |
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58 // evaluate. |
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59 |
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60 class |
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61 tree_statement |
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62 { |
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63 friend class tree_statement_list; |
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64 |
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65 public: |
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66 |
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67 tree_statement (void) |
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68 : cmd (0), expr (0), print_flag (true) { } |
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69 |
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70 tree_statement (tree_command *c) |
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71 : cmd (c), expr (0), print_flag (true) { } |
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72 |
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73 tree_statement (tree_expression *e) |
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74 : cmd (0), expr (e), print_flag (true) { } |
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75 |
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76 ~tree_statement (void); |
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77 |
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78 void set_print_flag (bool print) |
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79 { print_flag = print; } |
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80 |
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81 bool is_command (void) |
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82 { return cmd != 0; } |
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83 |
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84 bool is_expression (void) |
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85 { return expr != 0; } |
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86 |
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87 int line (void); |
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88 int column (void); |
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89 |
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90 void maybe_echo_code (bool); |
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91 |
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92 bool print_result (void) { return print_flag; } |
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93 |
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94 tree_command *command (void) { return cmd; } |
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95 |
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96 tree_expression *expression (void) { return expr; } |
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97 |
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98 void accept (tree_walker& tw); |
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99 |
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100 private: |
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101 |
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102 // Only one of cmd or expr can be valid at once. |
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103 |
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104 // Command to execute. |
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105 tree_command *cmd; |
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106 |
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107 // Expression to evaluate. |
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108 tree_expression *expr; |
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109 |
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110 // Print result of eval for this command? |
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111 bool print_flag; |
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112 }; |
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113 |
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114 // A list of statements to evaluate. |
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115 |
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116 class |
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117 tree_statement_list : public SLList<tree_statement *> |
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118 { |
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119 public: |
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120 |
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121 tree_statement_list (void) |
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122 : SLList<tree_statement *> (), function_body (false) { } |
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123 |
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124 tree_statement_list (tree_statement *s) |
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125 : SLList<tree_statement *> (), function_body (false) { append (s); } |
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126 |
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127 ~tree_statement_list (void) |
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128 { |
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129 while (! empty ()) |
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130 { |
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131 tree_statement *t = remove_front (); |
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132 delete t; |
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133 } |
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134 } |
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135 |
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136 void mark_as_function_body (void) { function_body = true; } |
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137 |
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138 octave_value eval (bool print); |
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139 |
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140 octave_value_list eval (bool print, int nargout); |
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141 |
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142 void accept (tree_walker& tw); |
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143 |
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144 private: |
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145 |
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146 // Does this list of statements make up the body of a function? |
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147 bool function_body; |
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148 }; |
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149 |
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150 // Argument lists. Used to hold the list of expressions that are the |
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151 // arguments in a function call or index expression. |
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152 |
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153 class |
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154 tree_argument_list : public SLList<tree_expression *> |
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155 { |
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156 public: |
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157 |
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158 tree_argument_list (void) |
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159 : SLList<tree_expression *> () { } |
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160 |
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161 tree_argument_list (tree_expression *t) |
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162 : SLList<tree_expression *> () { append (t); } |
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163 |
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164 ~tree_argument_list (void) |
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165 { |
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166 while (! empty ()) |
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167 { |
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168 tree_expression *t = remove_front (); |
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169 delete t; |
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170 } |
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171 } |
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172 |
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173 octave_value_list convert_to_const_vector (void); |
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174 |
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175 void accept (tree_walker& tw); |
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176 }; |
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177 |
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178 // Parameter lists. Used to hold the list of input and output |
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179 // parameters in a function definition. Elements are identifiers |
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180 // only. |
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181 |
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182 class |
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183 tree_parameter_list : public SLList<tree_identifier *> |
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184 { |
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185 public: |
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186 |
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187 tree_parameter_list (void) |
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188 : SLList<tree_identifier *> (), marked_for_varargs (0) { } |
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189 |
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190 tree_parameter_list (tree_identifier *t) |
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191 : SLList<tree_identifier *> (), marked_for_varargs (0) { append (t); } |
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192 |
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193 ~tree_parameter_list (void); |
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194 |
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195 void mark_as_formal_parameters (void); |
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196 |
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197 void mark_varargs (void) |
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198 { marked_for_varargs = 1; } |
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199 |
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200 bool takes_varargs (void) const |
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201 { return marked_for_varargs != 0; } |
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202 |
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203 void mark_varargs_only (void) |
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204 { marked_for_varargs = -1; } |
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205 |
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206 bool varargs_only (void) |
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207 { return (marked_for_varargs < 0); } |
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208 |
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209 void initialize_undefined_elements (octave_value& val); |
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210 |
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211 void define_from_arg_vector (const octave_value_list& args); |
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212 |
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213 bool is_defined (void); |
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214 |
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215 octave_value_list convert_to_const_vector (tree_va_return_list *vr_list); |
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216 |
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217 void accept (tree_walker& tw); |
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218 |
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219 private: |
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220 |
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221 int marked_for_varargs; |
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222 }; |
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223 |
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224 // Return lists. Used to hold the right hand sides of multiple |
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225 // assignment expressions. |
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226 |
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227 class |
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228 tree_return_list : public SLList<tree_index_expression *> |
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229 { |
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230 public: |
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231 |
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232 tree_return_list (void) |
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233 : SLList<tree_index_expression *> () { } |
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234 |
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235 tree_return_list (tree_index_expression *t) |
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236 : SLList<tree_index_expression *> () { append (t); } |
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237 |
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238 ~tree_return_list (void); |
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239 |
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240 void accept (tree_walker& tw); |
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241 }; |
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242 |
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243 class |
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244 tree_va_return_list : public SLList<octave_value> |
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245 { |
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246 public: |
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247 |
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248 tree_va_return_list (void) : SLList<octave_value> () { } |
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249 |
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250 ~tree_va_return_list (void) { } |
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251 }; |
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252 |
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253 // List of expressions that make up a global statement. |
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254 |
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255 class |
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256 tree_global |
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257 { |
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258 public: |
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259 |
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260 tree_global (void) |
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261 : id (0), ass_expr (0) { } |
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262 |
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263 tree_global (tree_identifier *i) |
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264 : id (i), ass_expr (0) { } |
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265 |
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266 tree_global (tree_simple_assignment_expression *ass) |
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267 : id (0), ass_expr (ass) { } |
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268 |
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269 ~tree_global (void); |
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270 |
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271 void eval (void); |
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272 |
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273 tree_identifier *ident (void) { return id; } |
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274 |
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275 tree_simple_assignment_expression *assign_expr (void) { return ass_expr; } |
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276 |
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277 void accept (tree_walker& tw); |
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278 |
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279 private: |
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280 |
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281 // Only one of id or ass_expr can be valid at once. |
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282 |
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283 // An identifier to make global. |
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284 tree_identifier *id; |
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285 |
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286 // An assignemnt expression. Valid only if the left hand side of |
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287 // the assignment is a simple identifier. |
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288 tree_simple_assignment_expression *ass_expr; |
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289 }; |
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290 |
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291 class |
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292 tree_global_init_list : public SLList<tree_global *> |
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293 { |
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294 public: |
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295 |
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296 tree_global_init_list (void) |
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297 : SLList<tree_global *> () { } |
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298 |
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299 tree_global_init_list (tree_global *t) |
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300 : SLList<tree_global *> () { append (t); } |
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301 |
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302 ~tree_global_init_list (void) |
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303 { |
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304 while (! empty ()) |
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305 { |
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306 tree_global *t = remove_front (); |
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307 delete t; |
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308 } |
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309 } |
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310 |
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311 void eval (void); |
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312 |
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313 void accept (tree_walker& tw); |
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314 }; |
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315 |
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316 class |
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317 tree_if_clause |
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318 { |
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319 public: |
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320 |
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321 tree_if_clause (void) : expr (0), list (0) { } |
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322 |
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323 tree_if_clause (tree_statement_list *l) |
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324 : expr (0), list (l) { } |
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325 |
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326 tree_if_clause (tree_expression *e, tree_statement_list *l) |
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327 : expr (e), list (l) { } |
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328 |
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329 ~tree_if_clause (void); |
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330 |
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331 bool is_else_clause (void) |
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332 { return ! expr; } |
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333 |
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334 int eval (void); |
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335 |
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336 tree_expression *condition (void) { return expr; } |
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337 |
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338 tree_statement_list *commands (void) { return list; } |
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339 |
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340 void accept (tree_walker& tw); |
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341 |
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342 private: |
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343 |
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344 // The condition to test. |
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345 tree_expression *expr; |
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346 |
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347 // The list of statements to evaluate if expr is true. |
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348 tree_statement_list *list; |
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349 }; |
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350 |
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351 class |
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352 tree_if_command_list : public SLList<tree_if_clause *> |
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353 { |
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354 public: |
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355 |
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356 tree_if_command_list (void) |
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357 : SLList<tree_if_clause *> () { } |
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358 |
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359 tree_if_command_list (tree_if_clause *t) |
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360 : SLList<tree_if_clause *> () { append (t); } |
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361 |
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362 ~tree_if_command_list (void) |
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363 { |
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364 while (! empty ()) |
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365 { |
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366 tree_if_clause *t = remove_front (); |
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367 delete t; |
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368 } |
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369 } |
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370 |
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371 void eval (void); |
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372 |
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373 void accept (tree_walker& tw); |
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374 }; |
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375 |
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376 #endif |
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377 |
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378 /* |
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379 ;;; Local Variables: *** |
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380 ;;; mode: C++ *** |
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381 ;;; End: *** |
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382 */ |
