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1 /* |
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2 |
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3 Copyright (C) 1996, 1997, 2000, 2001, 2002, 2004, 2005, 2006, 2007 |
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4 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 3 of the License, or (at your |
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11 option) any 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, see |
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20 <http://www.gnu.org/licenses/>. |
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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 #include "error.h" |
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29 #include "oct-obj.h" |
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30 #include "oct-lvalue.h" |
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31 #include "pager.h" |
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32 #include "pt-bp.h" |
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33 #include "pt-const.h" |
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34 #include "pt-id.h" |
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35 #include "pt-walk.h" |
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36 #include "symtab.h" |
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37 #include "utils.h" |
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38 #include "variables.h" |
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39 |
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40 // Symbols from the symbol table. |
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41 |
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42 void |
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43 tree_identifier::eval_undefined_error (void) |
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44 { |
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45 int l = line (); |
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46 int c = column (); |
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47 |
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48 if (l == -1 && c == -1) |
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49 ::error ("`%s' undefined", name ().c_str ()); |
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50 else |
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51 ::error ("`%s' undefined near line %d column %d", |
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52 name ().c_str (), l, c); |
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53 } |
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54 |
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55 octave_value_list |
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56 tree_identifier::rvalue (int nargout) |
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57 { |
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58 octave_value_list retval; |
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59 |
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60 MAYBE_DO_BREAKPOINT; |
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61 |
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62 if (error_state) |
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63 return retval; |
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64 |
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65 octave_value_list evaluated_args; |
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66 bool args_evaluated; |
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67 |
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68 octave_value val = sym.find (0, string_vector (), evaluated_args, |
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69 args_evaluated); |
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70 |
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71 if (val.is_defined ()) |
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72 { |
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73 // GAGME -- this would be cleaner if we required |
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74 // parens to indicate function calls. |
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75 // |
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76 // If this identifier refers to a function, we need to know |
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77 // whether it is indexed so that we can do the same thing |
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78 // for `f' and `f()'. If the index is present, return the |
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79 // function object and let tree_index_expression::rvalue |
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80 // handle indexing. Otherwise, arrange to call the function |
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81 // here, so that we don't return the function definition as |
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82 // a value. |
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83 |
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84 if (val.is_function () && ! is_postfix_indexed ()) |
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85 { |
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86 octave_value_list tmp_args; |
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87 |
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88 retval = val.do_multi_index_op (nargout, tmp_args); |
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89 } |
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90 else |
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91 { |
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92 if (print_result () && nargout == 0) |
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93 val.print_with_name (octave_stdout, name ()); |
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94 |
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95 retval = val; |
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96 } |
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97 } |
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98 else |
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99 eval_undefined_error (); |
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100 |
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101 return retval; |
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102 } |
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103 |
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104 octave_value |
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105 tree_identifier::rvalue (void) |
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106 { |
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107 octave_value retval; |
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108 |
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109 octave_value_list tmp = rvalue (1); |
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110 |
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111 if (! tmp.empty ()) |
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112 retval = tmp(0); |
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113 |
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114 return retval; |
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115 } |
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116 |
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117 octave_lvalue |
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118 tree_identifier::lvalue (void) |
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119 { |
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120 MAYBE_DO_BREAKPOINT; |
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121 |
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122 return octave_lvalue (&(sym.varref ())); |
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123 } |
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124 |
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125 tree_identifier * |
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126 tree_identifier::dup (symbol_table::scope_id scope) |
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127 { |
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128 // The new tree_identifier object contains a symbol_record |
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129 // entry from the duplicated scope. |
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130 |
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131 // FIXME -- is this the best way? |
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132 symbol_table::symbol_record new_sym |
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133 = symbol_table::find_symbol (sym.name (), scope); |
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134 |
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135 tree_identifier *new_id |
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136 = new tree_identifier (new_sym, line (), column ()); |
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137 |
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138 new_id->copy_base (*this); |
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139 |
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140 return new_id; |
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141 } |
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142 |
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143 void |
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144 tree_identifier::accept (tree_walker& tw) |
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145 { |
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146 tw.visit_identifier (*this); |
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147 } |
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148 |
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149 /* |
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150 ;;; Local Variables: *** |
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151 ;;; mode: C++ *** |
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152 ;;; End: *** |
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153 */ |
