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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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305 tree_parameter_list::convert_to_const_vector (void) |
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306 { |
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307 int nout = length (); |
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308 |
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309 Octave_object retval; |
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310 retval.resize (nout); |
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311 |
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312 int i = 0; |
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313 |
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314 for (Pix p = first (); p != 0; next (p)) |
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315 { |
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316 tree_identifier *elt = this->operator () (p); |
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317 |
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318 if (elt->is_defined ()) |
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319 retval(i) = elt->eval (0); |
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320 |
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321 i++; |
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322 } |
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323 |
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324 return retval; |
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325 } |
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326 |
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327 int |
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328 tree_parameter_list::is_defined (void) |
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329 { |
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330 int status = 1; |
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331 |
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332 for (Pix p = first (); p != 0; next (p)) |
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333 { |
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334 tree_identifier *elt = this->operator () (p); |
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335 |
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336 if (! elt->is_defined ()) |
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337 { |
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338 status = 0; |
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339 break; |
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340 } |
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341 } |
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342 |
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343 return status; |
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344 } |
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345 |
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346 void |
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581
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347 tree_parameter_list::print_code (ostream& os) |
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348 { |
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349 Pix p = first (); |
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350 |
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351 while (p) |
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352 { |
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353 tree_identifier *elt = this->operator () (p); |
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354 |
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355 next (p); |
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356 |
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357 if (elt) |
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358 { |
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359 elt->print_code (os); |
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360 |
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361 if (p) |
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362 os << ", "; |
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363 } |
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364 } |
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365 } |
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366 |
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367 // Return lists. |
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368 |
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369 void |
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370 tree_return_list::print_code (ostream& os) |
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371 { |
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372 Pix p = first (); |
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373 |
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374 while (p) |
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375 { |
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376 tree_index_expression *elt = this->operator () (p); |
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377 |
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378 next (p); |
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379 |
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380 if (elt) |
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381 { |
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382 elt->print_code (os); |
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383 |
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384 if (p) |
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385 os << ", "; |
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386 } |
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387 } |
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388 } |
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389 |
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390 // Global. |
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391 |
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392 void |
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577
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393 tree_global::eval (void) |
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394 { |
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395 if (ident) |
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396 { |
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397 ident->link_to_global (); |
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398 } |
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399 else if (assign_expr) |
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400 { |
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401 tree_identifier *id = assign_expr->left_hand_side (); |
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402 |
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403 if (id) |
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404 id->link_to_global (); |
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405 |
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406 assign_expr->eval (0); |
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407 } |
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408 } |
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409 |
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410 void |
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581
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411 tree_global::print_code (ostream& os) |
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412 { |
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413 if (ident) |
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414 ident->print_code (os); |
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415 |
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416 if (assign_expr) |
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417 assign_expr->print_code (os); |
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418 } |
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419 |
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420 // Global initializer lists. |
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421 |
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422 void |
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577
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423 tree_global_init_list::eval (void) |
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424 { |
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425 for (Pix p = first (); p != 0; next (p)) |
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426 { |
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427 tree_global *t = this->operator () (p); |
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428 t->eval (); |
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429 } |
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430 } |
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431 |
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581
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432 void |
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433 tree_global_init_list::print_code (ostream& os) |
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434 { |
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435 Pix p = first (); |
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436 |
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437 while (p) |
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438 { |
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439 tree_global *elt = this->operator () (p); |
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440 |
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441 next (p); |
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442 |
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443 if (elt) |
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444 { |
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445 elt->print_code (os); |
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446 |
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447 if (p) |
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448 os << ", "; |
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449 } |
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450 } |
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451 } |
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452 |
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453 // If. |
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454 |
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577
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455 int |
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456 tree_if_clause::eval (void) |
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457 { |
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458 if (expr) |
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459 { |
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460 tree_constant t1 = expr->eval (0); |
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461 |
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462 if (error_state || t1.is_undefined ()) |
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463 return 0; |
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464 |
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465 if (t1.rows () == 0 || t1.columns () == 0) |
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466 { |
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467 int flag = user_pref.propagate_empty_matrices; |
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468 if (flag < 0) |
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469 warning ("if: empty matrix used in conditional"); |
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470 else if (flag == 0) |
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471 { |
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472 ::error ("if: empty matrix used in conditional"); |
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473 return 0; |
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474 } |
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475 t1 = tree_constant (0.0); |
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476 } |
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477 else if (! t1.is_scalar_type ()) |
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478 { |
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479 tree_constant t2 = t1.all (); |
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480 t1 = t2.all (); |
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481 } |
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482 |
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483 int expr_value = 0; |
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620
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484 |
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485 if (t1.is_real_scalar ()) |
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577
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486 expr_value = (int) t1.double_value (); |
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620
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487 else if (t1.is_complex_scalar ()) |
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577
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488 expr_value = t1.complex_value () != 0.0; |
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489 else |
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490 panic_impossible (); |
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491 |
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492 if (expr_value) |
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493 { |
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494 if (list) |
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495 list->eval (1); |
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496 |
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497 return 1; |
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498 } |
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499 } |
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500 else |
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501 { |
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502 if (list) |
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503 list->eval (1); |
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504 |
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505 return 1; |
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506 } |
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507 |
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508 return 0; |
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509 } |
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510 |
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511 void |
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581
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512 tree_if_clause::print_code (ostream& os) |
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513 { |
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514 if (expr) |
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515 { |
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516 expr->print_code (os); |
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517 |
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518 print_code_new_line (os); |
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519 |
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520 increment_indent_level (); |
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521 } |
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522 else |
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523 { |
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524 print_code_indent (os); |
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525 |
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526 os << "else"; |
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527 |
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528 print_code_new_line (os); |
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529 |
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530 increment_indent_level (); |
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531 } |
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532 |
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533 if (list) |
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534 { |
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535 list->print_code (os); |
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536 |
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537 decrement_indent_level (); |
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538 } |
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539 } |
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540 |
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541 // List of if commands. |
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542 |
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543 void |
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577
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544 tree_if_command_list::eval (void) |
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|
545 { |
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546 for (Pix p = first (); p != 0; next (p)) |
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547 { |
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548 tree_if_clause *t = this->operator () (p); |
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549 |
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550 if (t->eval () || error_state) |
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551 break; |
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552 } |
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553 } |
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554 |
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581
|
555 void |
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556 tree_if_command_list::print_code (ostream& os) |
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|
557 { |
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558 Pix p = first (); |
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559 |
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560 int first_elt = 1; |
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561 |
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562 while (p) |
|
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563 { |
|
|
564 tree_if_clause *elt = this->operator () (p); |
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565 |
|
|
566 next (p); |
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|
567 |
|
|
568 if (elt) |
|
|
569 { |
|
|
570 if (p && ! first_elt) |
|
|
571 { |
|
|
572 print_code_indent (os); |
|
|
573 |
|
|
574 os << "elseif "; |
|
|
575 } |
|
|
576 |
|
|
577 elt->print_code (os); |
|
|
578 } |
|
|
579 |
|
|
580 first_elt = 0; |
|
|
581 } |
|
|
582 } |
|
|
583 |
|
577
|
584 /* |
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|
585 ;;; Local Variables: *** |
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|
586 ;;; mode: C++ *** |
|
|
587 ;;; page-delimiter: "^/\\*" *** |
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|
588 ;;; End: *** |
|
|
589 */ |
