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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 "oct-obj.h" |
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33 #include "oct-lvalue.h" |
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34 #include "ov.h" |
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2982
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35 #include "pt-arg-list.h" |
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36 #include "pt-idx.h" |
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37 #include "pt-walk.h" |
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38 |
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39 // Index expressions. |
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40 |
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3215
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41 tree_index_expression::tree_index_expression (tree_expression *e = 0, |
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42 tree_argument_list *lst = 0, |
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43 int l = -1, int c = -1) |
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44 : tree_expression (l, c), expr (e), list (lst), |
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45 arg_nm (lst ? lst->get_arg_names () : string_vector ()) { } |
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46 |
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47 tree_index_expression::~tree_index_expression (void) |
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48 { |
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49 delete expr; |
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50 delete list; |
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51 } |
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52 |
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53 // This is useful for printing the name of the variable in an indexed |
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54 // assignment. |
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55 |
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56 std:string |
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57 tree_index_expression::name (void) const |
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58 { |
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59 return expr->name (); |
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60 } |
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61 |
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62 octave_value_list |
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63 tree_index_expression::rvalue (int nargout) |
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64 { |
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65 octave_value_list retval; |
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66 |
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67 if (error_state) |
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68 return retval; |
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69 |
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70 octave_value tmp = expr->rvalue (); |
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71 |
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72 if (! error_state) |
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73 { |
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74 octave_value_list args; |
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75 |
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76 if (list) |
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77 args = list->convert_to_const_vector (); |
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78 |
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79 if (! error_state) |
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80 { |
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81 if (! args.empty ()) |
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82 args.stash_name_tags (arg_nm); |
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83 |
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84 // XXX FIXME XXX -- is this the right thing to do? |
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85 if (tmp.is_constant ()) |
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86 retval = tmp.do_index_op (args); |
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87 else |
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88 retval = tmp.do_index_op (nargout, args); |
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89 } |
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90 else |
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91 eval_error (); |
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92 } |
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93 else |
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94 eval_error (); |
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95 |
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96 return retval; |
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97 } |
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98 |
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99 octave_value |
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100 tree_index_expression::rvalue (void) |
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101 { |
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102 octave_value retval; |
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103 |
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104 octave_value_list tmp = rvalue (1); |
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105 |
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106 if (! tmp.empty ()) |
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107 retval = tmp(0); |
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108 |
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109 return retval; |
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110 } |
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111 |
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112 octave_lvalue |
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113 tree_index_expression::lvalue (void) |
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114 { |
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115 octave_lvalue retval; |
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116 |
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117 if (! error_state) |
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118 { |
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119 retval = expr->lvalue (); |
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120 |
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121 if (! error_state) |
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122 { |
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123 octave_value_list args; |
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124 |
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125 if (list) |
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126 args = list->convert_to_const_vector (); |
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127 |
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128 retval.set_index (args); |
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129 } |
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130 } |
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131 |
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132 return retval; |
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133 } |
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134 |
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135 void |
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136 tree_index_expression::eval_error (void) |
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137 { |
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138 if (error_state > 0) |
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139 { |
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140 int l = line (); |
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141 int c = column (); |
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142 |
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143 if (l != -1 && c != -1) |
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144 { |
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145 if (list) |
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146 ::error ("evaluating index expression near line %d, column %d", |
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147 l, c); |
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148 else |
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149 ::error ("evaluating expression near line %d, column %d", l, c); |
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150 } |
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151 else |
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152 { |
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153 if (list) |
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154 ::error ("evaluating index expression"); |
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155 else |
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156 ::error ("evaluating expression"); |
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157 } |
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158 } |
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159 } |
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160 |
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161 void |
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162 tree_index_expression::accept (tree_walker& tw) |
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163 { |
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164 tw.visit_index_expression (*this); |
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165 } |
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166 |
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167 /* |
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168 ;;; Local Variables: *** |
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169 ;;; mode: C++ *** |
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170 ;;; End: *** |
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171 */ |
