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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "error.h" |
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32 #include "gripes.h" |
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33 #include "oct-map.h" |
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34 #include "oct-obj.h" |
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35 #include "oct-sym.h" |
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36 #include "oct-var-ref.h" |
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37 #include "pager.h" |
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38 #include "pt-const.h" |
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39 #include "pt-id.h" |
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40 #include "pt-indir.h" |
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41 #include "pt-walk.h" |
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42 #include "symtab.h" |
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43 #include "utils.h" |
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44 |
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45 // Indirect references to values (structure elements). |
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46 |
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47 tree_indirect_ref::~tree_indirect_ref (void) |
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48 { |
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49 if (! preserve_ident) |
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50 delete id; |
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51 |
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52 if (! preserve_indir) |
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53 delete indir; |
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54 } |
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55 |
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56 void |
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57 tree_indirect_ref::mark_for_possible_ans_assign (void) |
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58 { |
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59 maybe_do_ans_assign = true; |
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60 |
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61 if (is_identifier_only ()) |
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62 id->mark_for_possible_ans_assign (); |
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63 } |
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64 |
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65 string |
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66 tree_indirect_ref::name (void) const |
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67 { |
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68 string retval; |
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69 |
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70 if (is_identifier_only ()) |
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71 retval = id->name (); |
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72 else |
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73 { |
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74 if (id) |
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75 retval = id->name (); |
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76 else if (indir) |
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77 retval = indir->name (); |
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78 else |
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79 panic_impossible (); |
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80 |
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81 retval.append ("."); |
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82 retval.append (nm); |
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83 } |
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84 |
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85 return retval; |
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86 } |
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87 |
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88 octave_value |
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89 tree_indirect_ref::eval (bool print) |
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90 { |
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91 octave_value retval; |
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92 |
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93 if (is_identifier_only ()) |
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94 retval = id->eval (print); |
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95 else |
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96 { |
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97 retval = value (); |
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98 |
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99 if (! error_state && retval.is_defined ()) |
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100 { |
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101 if (maybe_do_ans_assign) |
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102 bind_ans (retval, print); |
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103 else if (print) |
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104 retval.print_with_name (octave_stdout, name ()); |
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105 } |
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106 } |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 octave_value_list |
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112 tree_indirect_ref::eval (bool print, int nargout, |
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113 const octave_value_list& args) |
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114 { |
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115 octave_value_list retval; |
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116 |
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117 if (is_identifier_only ()) |
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118 retval = id->eval (print, nargout, args); |
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119 else |
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120 { |
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121 octave_value tmp = value (); |
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122 |
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123 if (! error_state && tmp.is_defined ()) |
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124 { |
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125 retval = tmp.index (args); |
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126 |
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127 if (! error_state) |
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128 { |
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129 if (maybe_do_ans_assign && nargout == 1 |
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130 && retval.length () > 0 && retval(0).is_defined ()) |
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131 bind_ans (retval(0), print); |
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132 } |
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133 } |
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134 } |
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135 |
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136 return retval; |
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137 } |
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138 |
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139 void |
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140 tree_indirect_ref::accept (tree_walker& tw) |
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141 { |
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142 tw.visit_indirect_ref (*this); |
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143 } |
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144 |
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145 octave_value |
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146 tree_indirect_ref::value (void) const |
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147 { |
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148 octave_value retval; |
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149 |
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150 if (is_identifier_only ()) |
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151 retval = id->value (); |
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152 else |
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153 { |
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154 if (id) |
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155 retval = id->value (); |
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156 else if (indir) |
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157 retval = indir->value (); |
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158 else |
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159 panic_impossible (); |
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160 |
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161 if (! error_state) |
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162 retval = retval.struct_elt_val (nm); |
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163 } |
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164 |
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165 return retval; |
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166 } |
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167 |
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168 octave_variable_reference |
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169 tree_indirect_ref::reference (void) |
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170 { |
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171 if (is_identifier_only ()) |
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172 return id->reference (); |
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173 else |
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174 { |
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175 octave_variable_reference tmp; |
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176 |
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177 if (id) |
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178 tmp = id->reference (); |
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179 else if (indir) |
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180 tmp = indir->reference (); |
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181 else |
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182 panic_impossible (); |
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183 |
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184 if (tmp.is_undefined ()) |
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185 tmp.define (Octave_map ()); |
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186 |
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187 return tmp.struct_elt_ref (nm); |
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188 } |
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189 } |
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190 |
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191 /* |
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192 ;;; Local Variables: *** |
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193 ;;; mode: C++ *** |
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194 ;;; End: *** |
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195 */ |
