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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_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 string_vector; |
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33 |
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34 class octave_value_list; |
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35 class octave_value; |
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36 class tree_command; |
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37 class tree_expression; |
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38 class tree_simple_assignment; |
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39 class tree_index_expression; |
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40 class tree_identifier; |
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41 class symbol_record; |
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42 class symbol_table; |
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43 |
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44 class tree_statement; |
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45 class tree_statement_list; |
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46 class tree_argument_list; |
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47 class tree_parameter_list; |
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48 class tree_return_list; |
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49 class tree_va_return_list; |
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50 class tree_decl_elt; |
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51 class tree_decl_init_list; |
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52 class tree_if_clause; |
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53 class tree_if_command_list; |
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54 class tree_switch_case; |
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55 class tree_switch_case_list; |
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56 |
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57 class tree_walker; |
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58 |
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59 #include <SLList.h> |
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60 |
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61 // A statement is either a command to execute or an expression to |
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62 // evaluate. |
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63 |
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64 class |
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65 tree_statement |
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66 { |
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67 public: |
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68 |
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69 tree_statement (void) |
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70 : cmd (0), expr (0), print_flag (true) { } |
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71 |
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72 tree_statement (tree_command *c) |
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73 : cmd (c), expr (0), print_flag (true) { } |
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74 |
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75 tree_statement (tree_expression *e) |
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76 : cmd (0), expr (e), print_flag (true) { } |
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77 |
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78 ~tree_statement (void); |
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79 |
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80 void set_print_flag (bool print) |
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81 { print_flag = print; } |
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82 |
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83 bool is_command (void) |
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84 { return cmd != 0; } |
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85 |
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86 bool is_expression (void) |
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87 { return expr != 0; } |
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88 |
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89 int line (void); |
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90 int column (void); |
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91 |
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92 void maybe_echo_code (bool in_function_body); |
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93 |
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94 bool print_result (void) { return print_flag; } |
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95 |
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96 tree_command *command (void) { return cmd; } |
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97 |
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98 octave_value_list eval (bool silent, int nargout, bool in_function_body); |
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99 |
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100 tree_expression *expression (void) { return expr; } |
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101 |
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102 void accept (tree_walker& tw); |
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103 |
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104 private: |
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105 |
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106 // Only one of cmd or expr can be valid at once. |
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107 |
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108 // Command to execute. |
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109 tree_command *cmd; |
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110 |
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111 // Expression to evaluate. |
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112 tree_expression *expr; |
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113 |
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114 // Print result of eval for this command? |
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115 bool print_flag; |
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116 }; |
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117 |
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118 // A list of statements to evaluate. |
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119 |
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120 class |
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121 tree_statement_list : public SLList<tree_statement *> |
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122 { |
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123 public: |
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124 |
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125 tree_statement_list (void) |
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126 : SLList<tree_statement *> (), function_body (false) { } |
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127 |
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128 tree_statement_list (tree_statement *s) |
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129 : SLList<tree_statement *> (), function_body (false) { append (s); } |
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130 |
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131 ~tree_statement_list (void) |
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132 { |
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133 while (! empty ()) |
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134 { |
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135 tree_statement *t = remove_front (); |
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136 delete t; |
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137 } |
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138 } |
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139 |
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140 void mark_as_function_body (void) { function_body = true; } |
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141 |
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142 octave_value_list eval (bool silent = false, int nargout = 0); |
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143 |
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144 void accept (tree_walker& tw); |
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145 |
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146 private: |
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147 |
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148 // Does this list of statements make up the body of a function? |
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149 bool function_body; |
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150 }; |
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151 |
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152 // Argument lists. Used to hold the list of expressions that are the |
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153 // arguments in a function call or index expression. |
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154 |
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155 class |
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156 tree_argument_list : public SLList<tree_expression *> |
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157 { |
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158 public: |
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159 |
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160 tree_argument_list (void) |
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161 : SLList<tree_expression *> () { } |
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162 |
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163 tree_argument_list (tree_expression *t) |
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164 : SLList<tree_expression *> () { append (t); } |
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165 |
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166 ~tree_argument_list (void); |
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167 |
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168 bool all_elements_are_constant (void) const; |
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169 |
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170 octave_value_list convert_to_const_vector (void); |
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171 |
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172 string_vector get_arg_names (void) const; |
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173 |
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174 void accept (tree_walker& tw); |
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175 }; |
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176 |
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177 // Parameter lists. Used to hold the list of input and output |
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178 // parameters in a function definition. Elements are identifiers |
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179 // only. |
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180 |
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181 class |
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182 tree_parameter_list : public SLList<tree_identifier *> |
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183 { |
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184 public: |
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185 |
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186 tree_parameter_list (void) |
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187 : SLList<tree_identifier *> (), marked_for_varargs (0) { } |
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188 |
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189 tree_parameter_list (tree_identifier *t) |
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190 : SLList<tree_identifier *> (), marked_for_varargs (0) { append (t); } |
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191 |
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192 ~tree_parameter_list (void); |
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193 |
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194 void mark_as_formal_parameters (void); |
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195 |
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196 void mark_varargs (void) |
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197 { marked_for_varargs = 1; } |
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198 |
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199 bool takes_varargs (void) const |
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200 { return marked_for_varargs != 0; } |
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201 |
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202 void mark_varargs_only (void) |
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203 { marked_for_varargs = -1; } |
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204 |
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205 bool varargs_only (void) |
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206 { return (marked_for_varargs < 0); } |
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207 |
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208 void initialize_undefined_elements (octave_value& val); |
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209 |
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210 void define_from_arg_vector (const octave_value_list& args); |
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211 |
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212 bool is_defined (void); |
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213 |
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214 octave_value_list convert_to_const_vector (tree_va_return_list *vr_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 int marked_for_varargs; |
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221 }; |
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222 |
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223 // Return lists. Used to hold the right hand sides of multiple |
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224 // assignment expressions. |
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225 |
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226 class |
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227 tree_return_list : public SLList<tree_index_expression *> |
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228 { |
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229 public: |
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230 |
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231 tree_return_list (void) |
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232 : SLList<tree_index_expression *> () { } |
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233 |
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234 tree_return_list (tree_index_expression *t) |
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235 : SLList<tree_index_expression *> () { append (t); } |
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236 |
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237 ~tree_return_list (void); |
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238 |
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239 void accept (tree_walker& tw); |
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240 }; |
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241 |
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242 class |
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243 tree_va_return_list : public SLList<octave_value> |
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244 { |
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245 public: |
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246 |
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247 tree_va_return_list (void) : SLList<octave_value> () { } |
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248 |
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249 ~tree_va_return_list (void) { } |
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250 }; |
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251 |
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252 // List of expressions that make up a declaration statement. |
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253 |
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254 class |
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255 tree_decl_elt |
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256 { |
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257 public: |
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258 |
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259 typedef void (*eval_fcn) (tree_decl_elt &, bool); |
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260 |
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261 tree_decl_elt (tree_identifier *i = 0, tree_expression *e = 0) |
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262 : id (i), expr (e) { } |
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263 |
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264 ~tree_decl_elt (void); |
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265 |
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266 void eval (void); |
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267 |
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268 tree_identifier *ident (void) { return id; } |
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269 |
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270 tree_expression *expression (void) { return expr; } |
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271 |
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272 void accept (tree_walker& tw); |
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273 |
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274 private: |
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275 |
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276 // An identifier to tag with the declared property. |
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277 tree_identifier *id; |
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278 |
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279 // An initializer expression (may be zero); |
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280 tree_expression *expr; |
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281 }; |
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282 |
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283 class |
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284 tree_decl_init_list : public SLList<tree_decl_elt *> |
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285 { |
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286 public: |
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287 |
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288 tree_decl_init_list (void) |
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289 : SLList<tree_decl_elt *> () { } |
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290 |
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291 tree_decl_init_list (tree_decl_elt *t) |
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292 : SLList<tree_decl_elt *> () { append (t); } |
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293 |
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294 ~tree_decl_init_list (void) |
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295 { |
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296 while (! empty ()) |
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297 { |
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298 tree_decl_elt *t = remove_front (); |
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299 delete t; |
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300 } |
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301 } |
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302 |
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303 void eval (tree_decl_elt::eval_fcn, bool); |
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304 |
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305 void accept (tree_walker& tw); |
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306 }; |
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307 |
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308 class |
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309 tree_if_clause |
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310 { |
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311 public: |
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312 |
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313 tree_if_clause (void) : expr (0), list (0) { } |
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314 |
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315 tree_if_clause (tree_statement_list *l) |
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316 : expr (0), list (l) { } |
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317 |
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318 tree_if_clause (tree_expression *e, tree_statement_list *l) |
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319 : expr (e), list (l) { } |
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320 |
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321 ~tree_if_clause (void); |
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322 |
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323 bool is_else_clause (void) |
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324 { return ! expr; } |
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325 |
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326 int eval (void); |
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327 |
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328 tree_expression *condition (void) { return expr; } |
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329 |
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330 tree_statement_list *commands (void) { return list; } |
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331 |
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332 void accept (tree_walker& tw); |
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333 |
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334 private: |
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335 |
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336 // The condition to test. |
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337 tree_expression *expr; |
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338 |
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339 // The list of statements to evaluate if expr is true. |
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340 tree_statement_list *list; |
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341 }; |
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342 |
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343 class |
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344 tree_if_command_list : public SLList<tree_if_clause *> |
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345 { |
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346 public: |
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347 |
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348 tree_if_command_list (void) |
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349 : SLList<tree_if_clause *> () { } |
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350 |
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351 tree_if_command_list (tree_if_clause *t) |
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352 : SLList<tree_if_clause *> () { append (t); } |
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353 |
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354 ~tree_if_command_list (void) |
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355 { |
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356 while (! empty ()) |
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357 { |
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358 tree_if_clause *t = remove_front (); |
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359 delete t; |
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360 } |
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361 } |
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362 |
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363 void eval (void); |
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364 |
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365 void accept (tree_walker& tw); |
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366 }; |
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367 |
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368 class |
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369 tree_switch_case |
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370 { |
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371 public: |
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372 |
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373 tree_switch_case (void) : label (0), list (0) { } |
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374 |
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375 tree_switch_case (tree_statement_list *l) |
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376 : label (0), list (l) { } |
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377 |
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378 tree_switch_case (tree_expression *e, tree_statement_list *l) |
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379 : label (e), list (l) { } |
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380 |
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381 ~tree_switch_case (void); |
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382 |
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383 bool is_default_case (void) |
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384 { return ! label; } |
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385 |
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386 bool label_matches (const octave_value& val); |
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387 |
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388 int eval (const octave_value& val); |
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389 |
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390 void eval_error (void); |
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391 |
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392 tree_expression *case_label (void) { return label; } |
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393 |
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394 tree_statement_list *commands (void) { return list; } |
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395 |
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396 void accept (tree_walker& tw); |
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397 |
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398 private: |
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399 |
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400 // The case label. |
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401 tree_expression *label; |
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402 |
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403 // The list of statements to evaluate if the label matches. |
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404 tree_statement_list *list; |
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405 }; |
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406 |
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407 class |
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408 tree_switch_case_list : public SLList<tree_switch_case *> |
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409 { |
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410 public: |
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411 |
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412 tree_switch_case_list (void) |
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413 : SLList<tree_switch_case *> () { } |
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414 |
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415 tree_switch_case_list (tree_switch_case *t) |
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416 : SLList<tree_switch_case *> () { append (t); } |
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417 |
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418 ~tree_switch_case_list (void) |
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419 { |
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420 while (! empty ()) |
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421 { |
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422 tree_switch_case *t = remove_front (); |
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423 delete t; |
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424 } |
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425 } |
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426 |
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427 void eval (const octave_value& val); |
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428 |
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429 void accept (tree_walker& tw); |
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430 }; |
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431 |
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432 #endif |
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433 |
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434 /* |
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435 ;;; Local Variables: *** |
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436 ;;; mode: C++ *** |
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437 ;;; End: *** |
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438 */ |
