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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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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include <sys/types.h> |
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29 #ifdef HAVE_UNISTD_H |
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30 #include <unistd.h> |
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31 #endif |
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32 |
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581
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33 #include <iostream.h> |
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34 |
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577
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35 #include "error.h" |
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584
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36 #include "tree-base.h" |
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37 #include "tree-expr.h" |
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38 #include "tree-cmd.h" |
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922
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39 #include "octave.h" |
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577
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40 #include "tree-misc.h" |
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41 #include "tree-const.h" |
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42 #include "user-prefs.h" |
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43 #include "oct-obj.h" |
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44 |
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1058
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45 // Nonzero means we're breaking out of a loop or function body. |
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577
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46 extern int breaking; |
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47 |
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48 // Nonzero means we're jumping to the end of a loop. |
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49 extern int continuing; |
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50 |
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51 // Nonzero means we're returning from a function. |
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52 extern int returning; |
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53 |
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54 // A list of commands to be executed. |
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55 |
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56 tree_statement::~tree_statement (void) |
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57 { |
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58 delete command; |
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59 delete expression; |
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60 } |
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61 |
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581
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62 void |
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63 tree_statement::print_code (ostream& os) |
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64 { |
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65 if (command) |
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66 { |
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67 command->print_code (os); |
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68 |
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69 if (! print_flag) |
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70 os << ";"; |
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71 |
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72 command->print_code_new_line (os); |
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73 } |
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74 else if (expression) |
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75 { |
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76 expression->print_code (os); |
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77 |
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78 if (! print_flag) |
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79 os << ";"; |
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80 |
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81 expression->print_code_new_line (os); |
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82 } |
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83 |
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84 |
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85 } |
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86 |
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577
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87 tree_constant |
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88 tree_statement_list::eval (int print) |
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89 { |
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90 int pf; |
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91 tree_constant retval; |
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92 |
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93 if (error_state) |
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94 return retval; |
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95 |
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96 for (Pix p = first (); p != 0; next (p)) |
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97 { |
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98 tree_statement *elt = this->operator () (p); |
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99 |
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100 if (print == 0) |
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101 pf = 0; |
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102 else |
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103 pf = elt->print_flag; |
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104 |
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105 tree_command *cmd = elt->command; |
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106 tree_expression *expr = elt->expression; |
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107 |
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108 if (cmd || expr) |
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109 { |
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110 if (cmd) |
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111 cmd->eval (); |
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112 else |
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113 retval = expr->eval (pf); |
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114 |
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115 if (error_state) |
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116 return tree_constant (); |
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117 |
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118 if (breaking || continuing) |
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119 break; |
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120 |
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121 if (returning) |
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122 break; |
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123 } |
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124 else |
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125 retval = tree_constant (); |
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126 } |
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127 return retval; |
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128 } |
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129 |
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672
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130 Octave_object |
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131 tree_statement_list::eval (int print, int nargout) |
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132 { |
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133 Octave_object retval; |
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134 |
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135 if (nargout > 1) |
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136 { |
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137 int pf; |
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138 |
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139 if (error_state) |
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140 return retval; |
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141 |
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142 for (Pix p = first (); p != 0; next (p)) |
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143 { |
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144 tree_statement *elt = this->operator () (p); |
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145 |
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146 if (print == 0) |
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147 pf = 0; |
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148 else |
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149 pf = elt->print_flag; |
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150 |
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151 tree_command *cmd = elt->command; |
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152 tree_expression *expr = elt->expression; |
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153 |
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154 if (cmd || expr) |
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155 { |
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156 if (cmd) |
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157 cmd->eval (); |
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158 else |
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159 { |
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160 if (expr->is_multi_val_ret_expression ()) |
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161 { |
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162 Octave_object args; |
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163 tree_multi_val_ret *t = (tree_multi_val_ret *) expr; |
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164 retval = t->eval (pf, nargout, args); |
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165 } |
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166 else |
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167 retval = expr->eval (pf); |
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168 } |
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169 |
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170 if (error_state) |
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171 return tree_constant (); |
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172 |
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173 if (breaking || continuing) |
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174 break; |
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175 |
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176 if (returning) |
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177 break; |
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178 } |
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179 else |
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180 retval = Octave_object (); |
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181 } |
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182 return retval; |
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183 } |
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184 else |
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185 retval = eval (print); |
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186 |
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187 return retval; |
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188 } |
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189 |
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581
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190 void |
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191 tree_statement_list::print_code (ostream& os) |
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192 { |
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193 for (Pix p = first (); p != 0; next (p)) |
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194 { |
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195 tree_statement *elt = this->operator () (p); |
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196 |
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197 if (elt) |
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198 elt->print_code (os); |
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199 } |
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200 } |
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201 |
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577
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202 Octave_object |
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203 tree_argument_list::convert_to_const_vector (void) |
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204 { |
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712
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205 int len = length (); |
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577
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206 |
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922
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207 // XXX FIXME XXX -- would be nice to know in advance how largs args |
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208 // needs to be even when we have a list containing an all_va_args |
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209 // token. |
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210 |
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577
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211 Octave_object args; |
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212 args.resize (len); |
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213 |
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214 Pix p = first (); |
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215 int j = 0; |
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712
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216 for (int k = 0; k < len; k++) |
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577
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217 { |
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218 tree_expression *elt = this->operator () (p); |
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219 if (elt) |
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220 { |
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221 tree_constant tmp = elt->eval (0); |
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577
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222 if (error_state) |
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223 { |
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224 ::error ("evaluating argument list element number %d", k); |
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922
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225 args = Octave_object (); |
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577
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226 break; |
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227 } |
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922
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228 else |
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229 { |
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230 if (tmp.is_all_va_args ()) |
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231 { |
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232 if (curr_function) |
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233 { |
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234 Octave_object tva; |
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235 tva = curr_function->octave_all_va_args (); |
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236 int n = tva.length (); |
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237 for (int i = 0; i < n; i++) |
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238 args(j++) = tva(i); |
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239 } |
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240 else |
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241 { |
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242 ::error ("all_va_args is only valid inside functions"); |
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243 args = Octave_object (); |
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244 break; |
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245 } |
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246 } |
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247 else |
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248 args(j++) = tmp; |
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249 } |
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577
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250 next (p); |
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251 } |
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252 else |
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253 { |
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254 args(j++) = tree_constant (); |
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255 break; |
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256 } |
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257 } |
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712
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258 |
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927
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259 args.resize (j); |
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260 |
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577
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261 return args; |
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262 } |
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263 |
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581
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264 void |
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265 tree_argument_list::print_code (ostream& os) |
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266 { |
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267 Pix p = first (); |
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268 |
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269 while (p) |
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270 { |
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271 tree_expression *elt = this->operator () (p); |
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272 |
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273 next (p); |
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274 |
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275 if (elt) |
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276 { |
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277 elt->print_code (os); |
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278 |
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279 if (p) |
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280 os << ", "; |
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281 } |
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282 } |
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283 } |
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284 |
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577
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285 // Parameter lists. |
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286 |
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287 void |
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288 tree_parameter_list::mark_as_formal_parameters (void) |
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289 { |
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290 for (Pix p = first (); p != 0; next (p)) |
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291 { |
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292 tree_identifier *elt = this->operator () (p); |
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293 elt->mark_as_formal_parameter (); |
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294 } |
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295 } |
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296 |
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297 void |
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298 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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299 { |
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712
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300 int nargin = args.length (); |
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301 |
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302 if (nargin <= 0) |
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577
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303 return; |
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304 |
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712
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305 int expected_nargin = length (); |
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577
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306 |
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307 Pix p = first (); |
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308 |
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712
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309 for (int i = 0; i < expected_nargin; i++) |
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577
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310 { |
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311 tree_identifier *elt = this->operator () (p); |
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312 |
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313 tree_constant *tmp = 0; |
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314 |
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315 if (i < nargin) |
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316 { |
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620
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317 if (args(i).is_defined () && args(i).is_magic_colon ()) |
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577
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318 { |
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319 ::error ("invalid use of colon in function argument list"); |
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320 return; |
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321 } |
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322 tmp = new tree_constant (args(i)); |
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323 } |
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324 |
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325 elt->define (tmp); |
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326 |
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327 next (p); |
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328 } |
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329 } |
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330 |
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331 Octave_object |
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723
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332 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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577
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333 { |
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334 int nout = length (); |
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335 |
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723
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336 if (vr_list) |
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337 nout += vr_list->length (); |
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338 |
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577
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339 Octave_object retval; |
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340 retval.resize (nout); |
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341 |
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342 int i = 0; |
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343 |
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344 for (Pix p = first (); p != 0; next (p)) |
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345 { |
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346 tree_identifier *elt = this->operator () (p); |
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347 |
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348 if (elt->is_defined ()) |
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349 retval(i) = elt->eval (0); |
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350 |
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351 i++; |
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352 } |
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353 |
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723
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354 if (vr_list) |
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355 { |
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356 for (p = vr_list->first (); p != 0; vr_list->next (p)) |
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357 { |
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358 retval(i) = vr_list->operator () (p); |
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359 i++; |
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360 } |
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361 } |
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362 |
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577
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363 return retval; |
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364 } |
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365 |
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366 int |
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367 tree_parameter_list::is_defined (void) |
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368 { |
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369 int status = 1; |
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370 |
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371 for (Pix p = first (); p != 0; next (p)) |
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372 { |
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373 tree_identifier *elt = this->operator () (p); |
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374 |
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375 if (! elt->is_defined ()) |
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376 { |
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377 status = 0; |
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378 break; |
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379 } |
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380 } |
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381 |
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382 return status; |
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383 } |
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384 |
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385 void |
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581
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386 tree_parameter_list::print_code (ostream& os) |
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387 { |
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388 Pix p = first (); |
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389 |
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390 while (p) |
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391 { |
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392 tree_identifier *elt = this->operator () (p); |
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393 |
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394 next (p); |
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395 |
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396 if (elt) |
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397 { |
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398 elt->print_code (os); |
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399 |
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400 if (p) |
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401 os << ", "; |
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402 } |
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403 } |
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404 } |
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405 |
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406 // Return lists. |
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407 |
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408 void |
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409 tree_return_list::print_code (ostream& os) |
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410 { |
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411 Pix p = first (); |
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412 |
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413 while (p) |
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414 { |
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415 tree_index_expression *elt = this->operator () (p); |
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416 |
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417 next (p); |
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418 |
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419 if (elt) |
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420 { |
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421 elt->print_code (os); |
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422 |
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423 if (p) |
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424 os << ", "; |
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425 } |
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426 } |
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427 } |
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428 |
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429 // Global. |
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430 |
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431 void |
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577
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432 tree_global::eval (void) |
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433 { |
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434 if (ident) |
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435 { |
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436 ident->link_to_global (); |
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437 } |
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438 else if (assign_expr) |
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439 { |
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745
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440 tree_identifier *id = 0; |
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441 if (assign_expr->left_hand_side_is_identifier_only () |
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442 && (id = assign_expr->left_hand_side_id ())) |
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443 { |
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444 id->link_to_global (); |
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445 assign_expr->eval (0); |
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446 } |
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447 else |
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448 error ("global: unable to make individual structure elements global"); |
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577
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449 } |
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450 } |
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451 |
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452 void |
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581
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453 tree_global::print_code (ostream& os) |
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454 { |
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455 if (ident) |
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456 ident->print_code (os); |
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457 |
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458 if (assign_expr) |
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459 assign_expr->print_code (os); |
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460 } |
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461 |
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462 // Global initializer lists. |
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463 |
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464 void |
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577
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465 tree_global_init_list::eval (void) |
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466 { |
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467 for (Pix p = first (); p != 0; next (p)) |
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468 { |
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469 tree_global *t = this->operator () (p); |
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470 t->eval (); |
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471 } |
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472 } |
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473 |
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581
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474 void |
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475 tree_global_init_list::print_code (ostream& os) |
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476 { |
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477 Pix p = first (); |
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478 |
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479 while (p) |
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480 { |
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481 tree_global *elt = this->operator () (p); |
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482 |
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483 next (p); |
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484 |
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485 if (elt) |
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486 { |
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487 elt->print_code (os); |
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488 |
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489 if (p) |
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490 os << ", "; |
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491 } |
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492 } |
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493 } |
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494 |
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495 // If. |
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496 |
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577
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497 int |
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498 tree_if_clause::eval (void) |
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499 { |
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500 if (expr) |
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501 { |
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502 tree_constant t1 = expr->eval (0); |
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503 |
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504 if (error_state || t1.is_undefined ()) |
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505 return 0; |
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506 |
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507 if (t1.rows () == 0 || t1.columns () == 0) |
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508 { |
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509 int flag = user_pref.propagate_empty_matrices; |
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510 if (flag < 0) |
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511 warning ("if: empty matrix used in conditional"); |
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512 else if (flag == 0) |
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513 { |
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514 ::error ("if: empty matrix used in conditional"); |
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515 return 0; |
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516 } |
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|
517 t1 = tree_constant (0.0); |
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518 } |
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519 else if (! t1.is_scalar_type ()) |
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520 { |
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521 tree_constant t2 = t1.all (); |
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|
522 t1 = t2.all (); |
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|
523 } |
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524 |
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525 int expr_value = 0; |
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620
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526 |
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|
527 if (t1.is_real_scalar ()) |
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577
|
528 expr_value = (int) t1.double_value (); |
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620
|
529 else if (t1.is_complex_scalar ()) |
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577
|
530 expr_value = t1.complex_value () != 0.0; |
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|
531 else |
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772
|
532 error ("if: all (all (cond)) is not a scalar"); |
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577
|
533 |
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|
534 if (expr_value) |
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|
535 { |
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|
536 if (list) |
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|
537 list->eval (1); |
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|
538 |
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|
539 return 1; |
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|
540 } |
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|
541 } |
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|
542 else |
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|
543 { |
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|
544 if (list) |
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545 list->eval (1); |
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546 |
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|
547 return 1; |
|
|
548 } |
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549 |
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|
550 return 0; |
|
|
551 } |
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|
552 |
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|
553 void |
|
581
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554 tree_if_clause::print_code (ostream& os) |
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|
555 { |
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556 if (expr) |
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|
557 { |
|
|
558 expr->print_code (os); |
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|
559 |
|
|
560 print_code_new_line (os); |
|
|
561 |
|
|
562 increment_indent_level (); |
|
|
563 } |
|
|
564 else |
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|
565 { |
|
|
566 print_code_indent (os); |
|
|
567 |
|
|
568 os << "else"; |
|
|
569 |
|
|
570 print_code_new_line (os); |
|
|
571 |
|
|
572 increment_indent_level (); |
|
|
573 } |
|
|
574 |
|
|
575 if (list) |
|
|
576 { |
|
|
577 list->print_code (os); |
|
|
578 |
|
|
579 decrement_indent_level (); |
|
|
580 } |
|
|
581 } |
|
|
582 |
|
|
583 // List of if commands. |
|
|
584 |
|
|
585 void |
|
577
|
586 tree_if_command_list::eval (void) |
|
|
587 { |
|
|
588 for (Pix p = first (); p != 0; next (p)) |
|
|
589 { |
|
|
590 tree_if_clause *t = this->operator () (p); |
|
|
591 |
|
|
592 if (t->eval () || error_state) |
|
|
593 break; |
|
|
594 } |
|
|
595 } |
|
|
596 |
|
581
|
597 void |
|
|
598 tree_if_command_list::print_code (ostream& os) |
|
|
599 { |
|
|
600 Pix p = first (); |
|
|
601 |
|
|
602 int first_elt = 1; |
|
|
603 |
|
|
604 while (p) |
|
|
605 { |
|
|
606 tree_if_clause *elt = this->operator () (p); |
|
|
607 |
|
|
608 next (p); |
|
|
609 |
|
|
610 if (elt) |
|
|
611 { |
|
|
612 if (p && ! first_elt) |
|
|
613 { |
|
|
614 print_code_indent (os); |
|
|
615 |
|
|
616 os << "elseif "; |
|
|
617 } |
|
|
618 |
|
|
619 elt->print_code (os); |
|
|
620 } |
|
|
621 |
|
|
622 first_elt = 0; |
|
|
623 } |
|
|
624 } |
|
|
625 |
|
577
|
626 /* |
|
|
627 ;;; Local Variables: *** |
|
|
628 ;;; mode: C++ *** |
|
|
629 ;;; page-delimiter: "^/\\*" *** |
|
|
630 ;;; End: *** |
|
|
631 */ |
