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577
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1 // tree-misc.cc -*- C++ -*- |
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2 /* |
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3 |
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1009
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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577
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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1297
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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577
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28 #ifdef HAVE_CONFIG_H |
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1192
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <iostream.h> |
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33 |
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34 #ifdef HAVE_UNISTD_H |
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577
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35 #include <sys/types.h> |
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36 #include <unistd.h> |
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37 #endif |
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38 |
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39 #include "error.h" |
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1352
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40 #include "oct-obj.h" |
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922
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41 #include "octave.h" |
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1352
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42 #include "tree-base.h" |
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43 #include "tree-cmd.h" |
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577
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44 #include "tree-const.h" |
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1352
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45 #include "tree-expr.h" |
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46 #include "tree-misc.h" |
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577
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47 #include "user-prefs.h" |
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48 |
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1058
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49 // Nonzero means we're breaking out of a loop or function body. |
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577
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50 extern int breaking; |
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51 |
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52 // Nonzero means we're jumping to the end of a loop. |
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53 extern int continuing; |
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54 |
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55 // Nonzero means we're returning from a function. |
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56 extern int returning; |
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57 |
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58 // A list of commands to be executed. |
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59 |
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60 tree_statement::~tree_statement (void) |
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61 { |
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62 delete command; |
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63 delete expression; |
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64 } |
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65 |
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581
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66 void |
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67 tree_statement::print_code (ostream& os) |
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68 { |
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69 if (command) |
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70 { |
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71 command->print_code (os); |
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72 |
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73 if (! print_flag) |
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74 os << ";"; |
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75 |
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76 command->print_code_new_line (os); |
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77 } |
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78 else if (expression) |
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79 { |
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80 expression->print_code (os); |
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81 |
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82 if (! print_flag) |
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83 os << ";"; |
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84 |
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85 expression->print_code_new_line (os); |
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86 } |
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87 |
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88 |
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89 } |
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90 |
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91 tree_constant |
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92 tree_statement_list::eval (int print) |
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93 { |
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94 int pf; |
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95 tree_constant retval; |
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96 |
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97 if (error_state) |
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98 return retval; |
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99 |
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100 for (Pix p = first (); p != 0; next (p)) |
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101 { |
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102 tree_statement *elt = this->operator () (p); |
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103 |
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104 if (print == 0) |
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105 pf = 0; |
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106 else |
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107 pf = elt->print_flag; |
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108 |
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109 tree_command *cmd = elt->command; |
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110 tree_expression *expr = elt->expression; |
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111 |
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112 if (cmd || expr) |
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113 { |
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114 if (cmd) |
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115 cmd->eval (); |
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116 else |
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117 retval = expr->eval (pf); |
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118 |
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119 if (error_state) |
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120 return tree_constant (); |
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121 |
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122 if (breaking || continuing) |
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123 break; |
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124 |
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125 if (returning) |
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126 break; |
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127 } |
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128 else |
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129 retval = tree_constant (); |
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130 } |
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131 return retval; |
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132 } |
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133 |
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672
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134 Octave_object |
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135 tree_statement_list::eval (int print, int nargout) |
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136 { |
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137 Octave_object retval; |
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138 |
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139 if (nargout > 1) |
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140 { |
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141 int pf; |
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142 |
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143 if (error_state) |
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144 return retval; |
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145 |
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146 for (Pix p = first (); p != 0; next (p)) |
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147 { |
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148 tree_statement *elt = this->operator () (p); |
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149 |
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150 if (print == 0) |
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151 pf = 0; |
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152 else |
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153 pf = elt->print_flag; |
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154 |
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155 tree_command *cmd = elt->command; |
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156 tree_expression *expr = elt->expression; |
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157 |
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158 if (cmd || expr) |
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159 { |
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160 if (cmd) |
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161 cmd->eval (); |
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162 else |
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163 { |
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164 if (expr->is_multi_val_ret_expression ()) |
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165 { |
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166 Octave_object args; |
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167 tree_multi_val_ret *t = (tree_multi_val_ret *) expr; |
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168 retval = t->eval (pf, nargout, args); |
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169 } |
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170 else |
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171 retval = expr->eval (pf); |
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172 } |
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173 |
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174 if (error_state) |
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175 return tree_constant (); |
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176 |
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177 if (breaking || continuing) |
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178 break; |
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179 |
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180 if (returning) |
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181 break; |
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182 } |
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183 else |
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184 retval = Octave_object (); |
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185 } |
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186 return retval; |
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187 } |
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188 else |
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189 retval = eval (print); |
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190 |
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191 return retval; |
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192 } |
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193 |
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581
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194 void |
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195 tree_statement_list::print_code (ostream& os) |
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196 { |
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197 for (Pix p = first (); p != 0; next (p)) |
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198 { |
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199 tree_statement *elt = this->operator () (p); |
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200 |
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201 if (elt) |
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202 elt->print_code (os); |
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203 } |
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204 } |
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205 |
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577
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206 Octave_object |
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207 tree_argument_list::convert_to_const_vector (void) |
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208 { |
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712
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209 int len = length (); |
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577
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210 |
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1358
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211 // XXX FIXME XXX -- would be nice to know in advance how largs args |
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212 // needs to be even when we have a list containing an all_va_args |
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213 // token. |
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922
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214 |
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577
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215 Octave_object args; |
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216 args.resize (len); |
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217 |
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218 Pix p = first (); |
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219 int j = 0; |
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712
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220 for (int k = 0; k < len; k++) |
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577
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221 { |
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222 tree_expression *elt = this->operator () (p); |
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223 if (elt) |
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224 { |
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922
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225 tree_constant tmp = elt->eval (0); |
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577
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226 if (error_state) |
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227 { |
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228 ::error ("evaluating argument list element number %d", k); |
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922
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229 args = Octave_object (); |
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230 break; |
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231 } |
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232 else |
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233 { |
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234 if (tmp.is_all_va_args ()) |
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235 { |
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236 if (curr_function) |
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237 { |
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238 Octave_object tva; |
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239 tva = curr_function->octave_all_va_args (); |
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240 int n = tva.length (); |
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241 for (int i = 0; i < n; i++) |
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242 args(j++) = tva(i); |
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243 } |
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244 else |
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245 { |
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246 ::error ("all_va_args is only valid inside functions"); |
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247 args = Octave_object (); |
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248 break; |
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249 } |
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250 } |
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251 else |
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252 args(j++) = tmp; |
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253 } |
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577
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254 next (p); |
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255 } |
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256 else |
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257 { |
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927
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258 args(j++) = tree_constant (); |
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259 break; |
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260 } |
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261 } |
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712
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262 |
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927
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263 args.resize (j); |
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264 |
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577
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265 return args; |
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266 } |
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267 |
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581
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268 void |
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269 tree_argument_list::print_code (ostream& os) |
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270 { |
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271 Pix p = first (); |
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272 |
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273 while (p) |
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274 { |
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275 tree_expression *elt = this->operator () (p); |
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276 |
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277 next (p); |
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278 |
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279 if (elt) |
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280 { |
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281 elt->print_code (os); |
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282 |
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283 if (p) |
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284 os << ", "; |
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285 } |
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286 } |
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287 } |
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288 |
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577
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289 // Parameter lists. |
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290 |
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291 void |
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292 tree_parameter_list::mark_as_formal_parameters (void) |
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293 { |
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294 for (Pix p = first (); p != 0; next (p)) |
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295 { |
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296 tree_identifier *elt = this->operator () (p); |
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297 elt->mark_as_formal_parameter (); |
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298 } |
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299 } |
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300 |
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301 void |
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1127
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302 tree_parameter_list::initialize_undefined_elements (tree_constant& val) |
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1093
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303 { |
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304 for (Pix p = first (); p != 0; next (p)) |
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305 { |
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306 tree_identifier *elt = this->operator () (p); |
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307 if (! elt->is_defined ()) |
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308 elt->assign (val); |
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309 } |
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310 } |
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311 |
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312 void |
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577
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313 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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314 { |
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712
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315 int nargin = args.length (); |
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316 |
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317 if (nargin <= 0) |
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577
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318 return; |
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319 |
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712
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320 int expected_nargin = length (); |
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577
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321 |
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322 Pix p = first (); |
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323 |
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712
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324 for (int i = 0; i < expected_nargin; i++) |
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577
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325 { |
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326 tree_identifier *elt = this->operator () (p); |
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327 |
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328 tree_constant *tmp = 0; |
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329 |
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330 if (i < nargin) |
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331 { |
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620
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332 if (args(i).is_defined () && args(i).is_magic_colon ()) |
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577
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333 { |
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334 ::error ("invalid use of colon in function argument list"); |
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335 return; |
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336 } |
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337 tmp = new tree_constant (args(i)); |
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338 } |
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339 |
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340 elt->define (tmp); |
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341 |
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342 next (p); |
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343 } |
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344 } |
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345 |
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346 Octave_object |
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723
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347 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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577
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348 { |
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349 int nout = length (); |
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350 |
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723
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351 if (vr_list) |
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352 nout += vr_list->length (); |
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353 |
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577
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354 Octave_object retval; |
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355 retval.resize (nout); |
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356 |
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357 int i = 0; |
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358 |
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359 for (Pix p = first (); p != 0; next (p)) |
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360 { |
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361 tree_identifier *elt = this->operator () (p); |
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362 |
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363 if (elt->is_defined ()) |
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364 retval(i) = elt->eval (0); |
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365 |
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366 i++; |
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367 } |
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368 |
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723
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369 if (vr_list) |
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370 { |
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1321
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371 for (Pix p = vr_list->first (); p != 0; vr_list->next (p)) |
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723
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372 { |
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373 retval(i) = vr_list->operator () (p); |
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374 i++; |
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375 } |
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376 } |
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377 |
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577
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378 return retval; |
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379 } |
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380 |
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381 int |
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382 tree_parameter_list::is_defined (void) |
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383 { |
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384 int status = 1; |
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385 |
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386 for (Pix p = first (); p != 0; next (p)) |
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387 { |
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388 tree_identifier *elt = this->operator () (p); |
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389 |
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390 if (! elt->is_defined ()) |
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391 { |
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392 status = 0; |
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393 break; |
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394 } |
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395 } |
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396 |
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397 return status; |
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398 } |
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399 |
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400 void |
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581
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401 tree_parameter_list::print_code (ostream& os) |
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402 { |
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403 Pix p = first (); |
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404 |
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405 while (p) |
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406 { |
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407 tree_identifier *elt = this->operator () (p); |
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408 |
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409 next (p); |
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410 |
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411 if (elt) |
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412 { |
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413 elt->print_code (os); |
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414 |
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415 if (p) |
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416 os << ", "; |
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417 } |
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418 } |
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419 } |
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420 |
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421 // Return lists. |
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422 |
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423 void |
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424 tree_return_list::print_code (ostream& os) |
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425 { |
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426 Pix p = first (); |
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427 |
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428 while (p) |
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429 { |
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430 tree_index_expression *elt = this->operator () (p); |
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431 |
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432 next (p); |
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433 |
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434 if (elt) |
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435 { |
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436 elt->print_code (os); |
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437 |
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438 if (p) |
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439 os << ", "; |
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440 } |
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441 } |
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442 } |
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443 |
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444 // Global. |
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445 |
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446 void |
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577
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447 tree_global::eval (void) |
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448 { |
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449 if (ident) |
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450 { |
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451 ident->link_to_global (); |
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452 } |
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453 else if (assign_expr) |
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454 { |
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745
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455 tree_identifier *id = 0; |
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456 if (assign_expr->left_hand_side_is_identifier_only () |
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457 && (id = assign_expr->left_hand_side_id ())) |
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458 { |
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459 id->link_to_global (); |
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460 assign_expr->eval (0); |
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461 } |
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462 else |
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463 error ("global: unable to make individual structure elements global"); |
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577
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464 } |
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465 } |
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466 |
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467 void |
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581
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468 tree_global::print_code (ostream& os) |
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469 { |
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470 if (ident) |
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471 ident->print_code (os); |
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472 |
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473 if (assign_expr) |
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474 assign_expr->print_code (os); |
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475 } |
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476 |
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477 // Global initializer lists. |
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478 |
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479 void |
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577
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480 tree_global_init_list::eval (void) |
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481 { |
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482 for (Pix p = first (); p != 0; next (p)) |
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483 { |
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484 tree_global *t = this->operator () (p); |
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485 t->eval (); |
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486 } |
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487 } |
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488 |
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581
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489 void |
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490 tree_global_init_list::print_code (ostream& os) |
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491 { |
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492 Pix p = first (); |
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493 |
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494 while (p) |
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495 { |
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496 tree_global *elt = this->operator () (p); |
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497 |
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498 next (p); |
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499 |
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500 if (elt) |
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501 { |
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502 elt->print_code (os); |
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503 |
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504 if (p) |
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505 os << ", "; |
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506 } |
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507 } |
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508 } |
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509 |
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510 // If. |
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511 |
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577
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512 int |
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513 tree_if_clause::eval (void) |
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514 { |
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1491
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515 if (is_else_clause () || expr->is_logically_true ("if")) |
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577
|
516 { |
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517 if (list) |
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518 list->eval (1); |
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519 |
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520 return 1; |
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521 } |
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522 |
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523 return 0; |
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524 } |
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525 |
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526 void |
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581
|
527 tree_if_clause::print_code (ostream& os) |
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|
528 { |
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529 if (expr) |
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1063
|
530 expr->print_code (os); |
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581
|
531 |
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1063
|
532 print_code_new_line (os); |
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|
533 increment_indent_level (); |
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581
|
534 |
|
|
535 if (list) |
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|
536 { |
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|
537 list->print_code (os); |
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|
538 |
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|
539 decrement_indent_level (); |
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|
540 } |
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541 } |
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542 |
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543 // List of if commands. |
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544 |
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545 void |
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577
|
546 tree_if_command_list::eval (void) |
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|
547 { |
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548 for (Pix p = first (); p != 0; next (p)) |
|
|
549 { |
|
|
550 tree_if_clause *t = this->operator () (p); |
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551 |
|
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552 if (t->eval () || error_state) |
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|
553 break; |
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|
554 } |
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555 } |
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|
556 |
|
581
|
557 void |
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|
558 tree_if_command_list::print_code (ostream& os) |
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|
559 { |
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560 Pix p = first (); |
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|
561 |
|
|
562 int first_elt = 1; |
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563 |
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|
564 while (p) |
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|
565 { |
|
|
566 tree_if_clause *elt = this->operator () (p); |
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567 |
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|
568 if (elt) |
|
|
569 { |
|
1063
|
570 if (! first_elt) |
|
581
|
571 { |
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|
572 print_code_indent (os); |
|
|
573 |
|
1063
|
574 if (elt->is_else_clause ()) |
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|
575 os << "else"; |
|
|
576 else |
|
|
577 os << "elseif "; |
|
581
|
578 } |
|
|
579 |
|
|
580 elt->print_code (os); |
|
|
581 } |
|
|
582 |
|
|
583 first_elt = 0; |
|
1063
|
584 next (p); |
|
581
|
585 } |
|
|
586 } |
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|
587 |
|
577
|
588 /* |
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589 ;;; Local Variables: *** |
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|
590 ;;; mode: C++ *** |
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591 ;;; page-delimiter: "^/\\*" *** |
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|
592 ;;; End: *** |
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|
593 */ |
