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