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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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4 Copyright (C) 1992, 1993, 1994 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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577
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39 #include "tree-misc.h" |
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40 #include "tree-const.h" |
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41 #include "user-prefs.h" |
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42 #include "oct-obj.h" |
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43 |
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44 // Nonzero means we're breaking out of a loop. |
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45 extern int breaking; |
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46 |
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47 // Nonzero means we're jumping to the end of a loop. |
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48 extern int continuing; |
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49 |
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50 // Nonzero means we're returning from a function. |
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51 extern int returning; |
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52 |
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53 // A list of commands to be executed. |
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54 |
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55 tree_statement::~tree_statement (void) |
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56 { |
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57 delete command; |
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58 delete expression; |
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59 } |
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60 |
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581
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61 void |
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62 tree_statement::print_code (ostream& os) |
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63 { |
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64 if (command) |
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65 { |
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66 command->print_code (os); |
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67 |
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68 if (! print_flag) |
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69 os << ";"; |
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70 |
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71 command->print_code_new_line (os); |
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72 } |
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73 else if (expression) |
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74 { |
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75 expression->print_code (os); |
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76 |
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77 if (! print_flag) |
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78 os << ";"; |
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79 |
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80 expression->print_code_new_line (os); |
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81 } |
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82 |
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83 |
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84 } |
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85 |
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577
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86 tree_constant |
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87 tree_statement_list::eval (int print) |
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88 { |
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89 int pf; |
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90 tree_constant retval; |
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91 |
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92 if (error_state) |
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93 return retval; |
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94 |
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95 for (Pix p = first (); p != 0; next (p)) |
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96 { |
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97 tree_statement *elt = this->operator () (p); |
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98 |
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99 if (print == 0) |
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100 pf = 0; |
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101 else |
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102 pf = elt->print_flag; |
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103 |
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104 tree_command *cmd = elt->command; |
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105 tree_expression *expr = elt->expression; |
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106 |
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107 if (cmd || expr) |
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108 { |
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109 if (cmd) |
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110 cmd->eval (); |
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111 else |
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112 retval = expr->eval (pf); |
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113 |
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114 if (error_state) |
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115 return tree_constant (); |
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116 |
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117 if (breaking || continuing) |
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118 break; |
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119 |
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120 if (returning) |
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121 break; |
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122 } |
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123 else |
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124 retval = tree_constant (); |
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125 } |
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126 return retval; |
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127 } |
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128 |
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672
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129 Octave_object |
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130 tree_statement_list::eval (int print, int nargout) |
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131 { |
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132 Octave_object retval; |
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133 |
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134 if (nargout > 1) |
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135 { |
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136 int pf; |
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137 |
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138 if (error_state) |
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139 return retval; |
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140 |
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141 for (Pix p = first (); p != 0; next (p)) |
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142 { |
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143 tree_statement *elt = this->operator () (p); |
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144 |
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145 if (print == 0) |
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146 pf = 0; |
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147 else |
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148 pf = elt->print_flag; |
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149 |
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150 tree_command *cmd = elt->command; |
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151 tree_expression *expr = elt->expression; |
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152 |
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153 if (cmd || expr) |
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154 { |
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155 if (cmd) |
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156 cmd->eval (); |
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157 else |
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158 { |
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159 if (expr->is_multi_val_ret_expression ()) |
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160 { |
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161 Octave_object args; |
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162 tree_multi_val_ret *t = (tree_multi_val_ret *) expr; |
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163 retval = t->eval (pf, nargout, args); |
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164 } |
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165 else |
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166 retval = expr->eval (pf); |
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167 } |
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168 |
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169 if (error_state) |
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170 return tree_constant (); |
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171 |
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172 if (breaking || continuing) |
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173 break; |
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174 |
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175 if (returning) |
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176 break; |
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177 } |
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178 else |
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179 retval = Octave_object (); |
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180 } |
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181 return retval; |
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182 } |
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183 else |
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184 retval = eval (print); |
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185 |
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186 return retval; |
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187 } |
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188 |
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581
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189 void |
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190 tree_statement_list::print_code (ostream& os) |
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191 { |
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192 for (Pix p = first (); p != 0; next (p)) |
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193 { |
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194 tree_statement *elt = this->operator () (p); |
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195 |
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196 if (elt) |
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197 elt->print_code (os); |
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198 } |
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199 } |
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200 |
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577
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201 Octave_object |
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202 tree_argument_list::convert_to_const_vector (void) |
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203 { |
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712
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204 int len = length (); |
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577
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205 |
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206 Octave_object args; |
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207 args.resize (len); |
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208 |
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209 Pix p = first (); |
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712
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210 for (int k = 0; k < len; k++) |
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577
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211 { |
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212 tree_expression *elt = this->operator () (p); |
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213 if (elt) |
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214 { |
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215 args(k) = elt->eval (0); |
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216 if (error_state) |
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217 { |
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218 ::error ("evaluating argument list element number %d", k); |
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219 break; |
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220 } |
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221 next (p); |
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222 } |
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223 else |
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224 { |
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225 args(k) = tree_constant (); |
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226 break; |
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227 } |
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228 } |
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712
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229 |
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577
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230 return args; |
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231 } |
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232 |
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581
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233 void |
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234 tree_argument_list::print_code (ostream& os) |
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235 { |
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236 Pix p = first (); |
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237 |
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238 while (p) |
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239 { |
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240 tree_expression *elt = this->operator () (p); |
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241 |
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242 next (p); |
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243 |
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244 if (elt) |
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245 { |
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246 elt->print_code (os); |
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247 |
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248 if (p) |
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249 os << ", "; |
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250 } |
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251 } |
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252 } |
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253 |
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577
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254 // Parameter lists. |
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255 |
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256 void |
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257 tree_parameter_list::mark_as_formal_parameters (void) |
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258 { |
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259 for (Pix p = first (); p != 0; next (p)) |
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260 { |
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261 tree_identifier *elt = this->operator () (p); |
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262 elt->mark_as_formal_parameter (); |
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263 } |
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264 } |
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265 |
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266 void |
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267 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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268 { |
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712
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269 int nargin = args.length (); |
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270 |
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271 if (nargin <= 0) |
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577
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272 return; |
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273 |
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712
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274 int expected_nargin = length (); |
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577
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275 |
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276 Pix p = first (); |
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277 |
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712
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278 for (int i = 0; i < expected_nargin; i++) |
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577
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279 { |
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280 tree_identifier *elt = this->operator () (p); |
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281 |
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282 tree_constant *tmp = 0; |
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283 |
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284 if (i < nargin) |
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285 { |
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620
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286 if (args(i).is_defined () && args(i).is_magic_colon ()) |
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577
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287 { |
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288 ::error ("invalid use of colon in function argument list"); |
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289 return; |
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290 } |
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291 tmp = new tree_constant (args(i)); |
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292 } |
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293 |
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294 elt->define (tmp); |
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295 |
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296 next (p); |
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297 } |
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298 } |
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299 |
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300 Octave_object |
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723
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301 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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577
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302 { |
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303 int nout = length (); |
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304 |
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723
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305 if (vr_list) |
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306 nout += vr_list->length (); |
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307 |
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577
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308 Octave_object retval; |
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309 retval.resize (nout); |
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310 |
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311 int i = 0; |
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312 |
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313 for (Pix p = first (); p != 0; next (p)) |
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314 { |
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315 tree_identifier *elt = this->operator () (p); |
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316 |
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317 if (elt->is_defined ()) |
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318 retval(i) = elt->eval (0); |
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319 |
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320 i++; |
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321 } |
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322 |
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723
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323 if (vr_list) |
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324 { |
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325 for (p = vr_list->first (); p != 0; vr_list->next (p)) |
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326 { |
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327 retval(i) = vr_list->operator () (p); |
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328 i++; |
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329 } |
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330 } |
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331 |
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577
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332 return retval; |
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333 } |
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334 |
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335 int |
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336 tree_parameter_list::is_defined (void) |
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337 { |
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338 int status = 1; |
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339 |
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340 for (Pix p = first (); p != 0; next (p)) |
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341 { |
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342 tree_identifier *elt = this->operator () (p); |
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343 |
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344 if (! elt->is_defined ()) |
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345 { |
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346 status = 0; |
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347 break; |
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348 } |
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349 } |
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350 |
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351 return status; |
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352 } |
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353 |
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354 void |
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581
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355 tree_parameter_list::print_code (ostream& os) |
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356 { |
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357 Pix p = first (); |
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358 |
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359 while (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 next (p); |
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364 |
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365 if (elt) |
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366 { |
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367 elt->print_code (os); |
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368 |
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369 if (p) |
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370 os << ", "; |
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371 } |
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372 } |
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373 } |
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374 |
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375 // Return lists. |
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376 |
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377 void |
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378 tree_return_list::print_code (ostream& os) |
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379 { |
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380 Pix p = first (); |
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381 |
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382 while (p) |
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383 { |
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384 tree_index_expression *elt = this->operator () (p); |
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385 |
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386 next (p); |
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387 |
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388 if (elt) |
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389 { |
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390 elt->print_code (os); |
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391 |
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392 if (p) |
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393 os << ", "; |
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394 } |
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395 } |
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396 } |
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397 |
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398 // Global. |
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399 |
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400 void |
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577
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401 tree_global::eval (void) |
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402 { |
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403 if (ident) |
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404 { |
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405 ident->link_to_global (); |
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406 } |
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407 else if (assign_expr) |
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408 { |
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745
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409 tree_identifier *id = 0; |
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410 if (assign_expr->left_hand_side_is_identifier_only () |
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411 && (id = assign_expr->left_hand_side_id ())) |
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412 { |
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413 id->link_to_global (); |
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414 assign_expr->eval (0); |
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415 } |
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416 else |
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417 error ("global: unable to make individual structure elements global"); |
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577
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418 } |
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419 } |
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420 |
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421 void |
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581
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422 tree_global::print_code (ostream& os) |
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423 { |
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424 if (ident) |
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425 ident->print_code (os); |
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426 |
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427 if (assign_expr) |
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428 assign_expr->print_code (os); |
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429 } |
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430 |
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431 // Global initializer lists. |
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432 |
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433 void |
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577
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434 tree_global_init_list::eval (void) |
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435 { |
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436 for (Pix p = first (); p != 0; next (p)) |
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437 { |
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438 tree_global *t = this->operator () (p); |
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439 t->eval (); |
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440 } |
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441 } |
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442 |
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581
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443 void |
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444 tree_global_init_list::print_code (ostream& os) |
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445 { |
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446 Pix p = first (); |
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447 |
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448 while (p) |
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449 { |
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450 tree_global *elt = this->operator () (p); |
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451 |
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452 next (p); |
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453 |
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454 if (elt) |
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455 { |
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456 elt->print_code (os); |
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457 |
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458 if (p) |
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459 os << ", "; |
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460 } |
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461 } |
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462 } |
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463 |
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464 // If. |
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465 |
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577
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466 int |
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467 tree_if_clause::eval (void) |
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468 { |
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469 if (expr) |
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470 { |
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471 tree_constant t1 = expr->eval (0); |
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472 |
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473 if (error_state || t1.is_undefined ()) |
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474 return 0; |
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475 |
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476 if (t1.rows () == 0 || t1.columns () == 0) |
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477 { |
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478 int flag = user_pref.propagate_empty_matrices; |
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479 if (flag < 0) |
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480 warning ("if: empty matrix used in conditional"); |
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481 else if (flag == 0) |
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482 { |
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483 ::error ("if: empty matrix used in conditional"); |
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484 return 0; |
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485 } |
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486 t1 = tree_constant (0.0); |
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487 } |
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488 else if (! t1.is_scalar_type ()) |
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489 { |
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490 tree_constant t2 = t1.all (); |
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491 t1 = t2.all (); |
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492 } |
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493 |
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494 int expr_value = 0; |
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620
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495 |
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496 if (t1.is_real_scalar ()) |
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577
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497 expr_value = (int) t1.double_value (); |
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620
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498 else if (t1.is_complex_scalar ()) |
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577
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499 expr_value = t1.complex_value () != 0.0; |
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500 else |
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772
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501 error ("if: all (all (cond)) is not a scalar"); |
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577
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502 |
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503 if (expr_value) |
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504 { |
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505 if (list) |
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506 list->eval (1); |
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507 |
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508 return 1; |
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509 } |
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510 } |
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511 else |
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512 { |
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513 if (list) |
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514 list->eval (1); |
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515 |
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516 return 1; |
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517 } |
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518 |
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519 return 0; |
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520 } |
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521 |
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522 void |
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581
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523 tree_if_clause::print_code (ostream& os) |
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524 { |
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525 if (expr) |
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526 { |
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527 expr->print_code (os); |
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528 |
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529 print_code_new_line (os); |
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530 |
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531 increment_indent_level (); |
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532 } |
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533 else |
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534 { |
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535 print_code_indent (os); |
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536 |
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537 os << "else"; |
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538 |
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539 print_code_new_line (os); |
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540 |
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541 increment_indent_level (); |
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542 } |
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543 |
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544 if (list) |
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545 { |
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546 list->print_code (os); |
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547 |
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548 decrement_indent_level (); |
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549 } |
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550 } |
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551 |
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552 // List of if commands. |
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553 |
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554 void |
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577
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555 tree_if_command_list::eval (void) |
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556 { |
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557 for (Pix p = first (); p != 0; next (p)) |
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558 { |
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559 tree_if_clause *t = this->operator () (p); |
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560 |
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|
561 if (t->eval () || error_state) |
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562 break; |
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563 } |
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|
564 } |
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|
565 |
|
581
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566 void |
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|
567 tree_if_command_list::print_code (ostream& os) |
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|
568 { |
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|
569 Pix p = first (); |
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|
570 |
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|
571 int first_elt = 1; |
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|
572 |
|
|
573 while (p) |
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|
574 { |
|
|
575 tree_if_clause *elt = this->operator () (p); |
|
|
576 |
|
|
577 next (p); |
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|
578 |
|
|
579 if (elt) |
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|
580 { |
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|
581 if (p && ! first_elt) |
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|
582 { |
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|
583 print_code_indent (os); |
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|
584 |
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|
585 os << "elseif "; |
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|
586 } |
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|
587 |
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|
588 elt->print_code (os); |
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|
589 } |
|
|
590 |
|
|
591 first_elt = 0; |
|
|
592 } |
|
|
593 } |
|
|
594 |
|
577
|
595 /* |
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|
596 ;;; Local Variables: *** |
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|
597 ;;; mode: C++ *** |
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598 ;;; page-delimiter: "^/\\*" *** |
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|
599 ;;; End: *** |
|
|
600 */ |
