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1 /* |
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2 |
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3 Copyright (C) 1996, 1997, 1998, 1999, 2002, 2004, 2005, 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 "ov.h" |
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32 |
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33 void |
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34 octave_lvalue::assign (octave_value::assign_op op, const octave_value& rhs) |
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35 { |
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36 octave_value tmp (idx.empty () |
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37 ? val->assign (op, rhs) |
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38 : val->assign (op, type, idx, rhs)); |
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39 |
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40 if (! error_state) |
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41 *val = tmp; |
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42 } |
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43 |
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44 void |
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45 octave_lvalue::set_index (const std::string& t, |
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46 const std::list<octave_value_list>& i) |
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47 { |
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48 if (! index_set) |
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49 { |
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50 type = t; |
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51 idx = i; |
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52 index_set = true; |
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53 } |
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54 else |
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55 error ("invalid index expression in assignment"); |
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56 } |
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57 |
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58 void |
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59 octave_lvalue::do_unary_op (octave_value::unary_op op) |
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60 { |
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61 octave_value tmp (idx.empty () |
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62 ? val->do_non_const_unary_op (op) |
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63 : val->do_non_const_unary_op (op, type, idx)); |
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64 |
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65 if (! error_state) |
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66 *val = tmp; |
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67 } |
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68 |
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69 octave_value |
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70 octave_lvalue::value (void) |
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71 { |
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72 octave_value retval; |
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73 |
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74 if (idx.empty ()) |
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75 retval = *val; |
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76 else |
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77 { |
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78 if (val->is_constant ()) |
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79 retval = val->subsref (type, idx); |
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80 else |
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81 { |
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82 octave_value_list t = val->subsref (type, idx, 1); |
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83 if (t.length () > 0) |
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84 retval = t(0); |
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85 } |
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86 } |
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87 |
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88 return retval; |
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89 } |
