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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 (octave_lvalue_h) |
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24 #define octave_lvalue_h 1 |
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25 |
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26 class octave_value; |
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27 class octave_value_list; |
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28 |
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29 #include <string> |
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30 |
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31 #include "oct-obj.h" |
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32 #include "symtab.h" |
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33 |
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34 class |
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35 octave_lvalue |
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36 { |
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37 public: |
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38 |
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39 octave_lvalue (octave_value *v = 0, symbol_record::change_function f = 0) |
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40 : val (v), idx (), chg_fcn (f), struct_elt_name () { } |
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41 |
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42 octave_lvalue (octave_value *v, const string& nm, |
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43 symbol_record::change_function f = 0) |
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44 : val (v), idx (), chg_fcn (f), struct_elt_name (nm) { } |
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45 |
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46 octave_lvalue (const octave_lvalue& vr) |
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47 : val (vr.val), idx (vr.idx), chg_fcn (vr.chg_fcn), |
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48 struct_elt_name (vr.struct_elt_name) { } |
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49 |
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50 octave_lvalue& operator = (const octave_lvalue& vr) |
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51 { |
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52 if (this != &vr) |
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53 { |
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54 val = vr.val; |
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55 idx = vr.idx; |
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56 chg_fcn = vr.chg_fcn; |
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57 struct_elt_name = vr.struct_elt_name; |
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58 } |
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59 |
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60 return *this; |
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61 } |
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62 |
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63 ~octave_lvalue (void) { } |
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64 |
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65 bool is_defined (void) { return val->is_defined (); } |
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66 |
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67 bool is_undefined (void) { return val->is_undefined (); } |
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68 |
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69 bool is_map (void) { return val->is_map (); } |
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70 |
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71 void define (const octave_value& v) { *val = v; } |
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72 |
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73 void assign (octave_value::assign_op, const octave_value&); |
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74 |
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75 octave_lvalue struct_elt_ref (const string& nm) |
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76 { return val->struct_elt_ref (nm); } |
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77 |
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78 void set_index (const octave_value_list& i) { idx = i; } |
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79 |
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80 void clear_index (void) { idx = octave_value_list (); } |
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81 |
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82 // XXX FIXME XXX -- need to handle index increment and decrement too. |
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83 |
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84 void increment (void) { val->increment (); } |
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85 |
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86 void decrement (void) { val->decrement (); } |
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87 |
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88 octave_value value (void) |
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89 { |
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90 return struct_elt_name.empty () |
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91 ? (idx.empty () |
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92 ? *val |
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93 : val->do_index_op (idx)) |
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94 : (idx.empty () |
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95 ? val->do_struct_elt_index_op (struct_elt_name) |
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96 : val->do_struct_elt_index_op (struct_elt_name, idx)); |
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97 } |
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98 |
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99 private: |
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100 |
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101 octave_value *val; |
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102 |
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103 octave_value_list idx; |
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104 |
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105 symbol_record::change_function chg_fcn; |
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106 |
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107 string struct_elt_name; |
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108 }; |
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109 |
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110 #endif |
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111 |
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112 /* |
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113 ;;; Local Variables: *** |
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114 ;;; mode: C++ *** |
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115 ;;; End: *** |
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116 */ |
