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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-map.h" |
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33 #include "oct-obj.h" |
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34 #include "oct-lvalue.h" |
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35 #include "ov.h" |
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36 #include "pager.h" |
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37 #include "pt-indir.h" |
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38 #include "pt-walk.h" |
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39 #include "utils.h" |
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40 #include "variables.h" |
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41 |
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42 // Indirect references to values (structure elements). |
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43 |
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44 tree_indirect_ref::~tree_indirect_ref (void) |
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45 { |
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46 delete expr; |
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47 } |
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48 |
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49 string |
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50 tree_indirect_ref::name (void) const |
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51 { |
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52 // ??? FIXME ??? |
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53 string xname = expr->name (); |
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54 |
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55 return (xname == "<unknown>") ? xname : xname + "." + nm; |
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56 } |
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57 |
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58 octave_value_list |
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59 tree_indirect_ref::rvalue (int nargout) |
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60 { |
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61 octave_value_list retval; |
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62 |
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63 if (nargout > 1) |
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64 error ("invalid number of output arguments for structure reference"); |
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65 else |
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66 { |
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67 octave_value_list tmp = expr->rvalue (nargout); |
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68 |
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69 if (tmp.empty ()) |
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70 eval_error (); |
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71 else |
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72 { |
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73 octave_value val = tmp(0).do_struct_elt_index_op (nm); |
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74 |
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75 if (print_result () && nargout == 0 && val.is_defined ()) |
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76 { |
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77 // ??? FIXME ??? |
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78 |
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79 string xname = name (); |
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80 |
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81 if (xname == "<unknown>") |
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82 bind_ans (val, true); |
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83 else |
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84 val.print_with_name (octave_stdout, xname); |
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85 } |
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86 |
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87 retval = val; |
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88 } |
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89 } |
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90 |
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91 return retval; |
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92 } |
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93 |
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94 octave_value |
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95 tree_indirect_ref::rvalue (void) |
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96 { |
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97 octave_value retval; |
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98 |
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99 octave_value_list tmp = rvalue (1); |
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100 |
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101 if (! tmp.empty ()) |
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102 retval = tmp(0); |
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103 |
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104 return retval; |
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105 } |
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106 |
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107 octave_lvalue |
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108 tree_indirect_ref::lvalue (void) |
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109 { |
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110 octave_lvalue tmp = expr->lvalue (); |
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111 |
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112 if (tmp.is_undefined () || ! tmp.is_map ()) |
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113 tmp.define (Octave_map ()); |
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114 |
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115 return tmp.struct_elt_ref (nm); |
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116 } |
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117 |
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118 void |
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119 tree_indirect_ref::accept (tree_walker& tw) |
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120 { |
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121 tw.visit_indirect_ref (*this); |
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122 } |
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123 |
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124 void |
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125 tree_indirect_ref::eval_error (void) const |
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126 { |
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127 if (error_state > 0) |
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128 ::error ("evaluating structure reference operator near line %d, column %d", |
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129 line (), column ()); |
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130 } |
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131 |
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132 /* |
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133 ;;; Local Variables: *** |
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134 ;;; mode: C++ *** |
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135 ;;; End: *** |
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136 */ |
