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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 <string> |
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32 |
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33 #include <iostream.h> |
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34 #include <strstream.h> |
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35 |
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36 #include "error.h" |
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37 #include "pager.h" |
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38 #include "oct-var-ref.h" |
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39 #include "ov.h" |
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40 #include "pt-exp-base.h" |
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41 |
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42 // Expressions. |
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43 |
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44 bool |
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45 tree_expression::is_logically_true (const char *warn_for) |
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46 { |
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47 bool expr_value = false; |
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48 |
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49 octave_value t1 = rvalue (); |
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50 |
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51 if (! error_state) |
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52 { |
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53 if (t1.is_defined ()) |
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54 return t1.is_true (); |
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55 else |
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56 ::error ("%s: undefined value used in conditional expression", |
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57 warn_for); |
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58 } |
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59 else |
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60 ::error ("%s: error evaluating conditional expression", warn_for); |
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61 |
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62 return expr_value; |
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63 } |
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64 |
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65 octave_value |
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66 tree_expression::rvalue (void) |
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67 { |
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68 ::error ("invalid rvalue function called in expression"); |
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69 return octave_value (); |
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70 } |
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71 |
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72 octave_value_list |
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73 tree_expression::rvalue (int nargout) |
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74 { |
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75 ::error ("invalid rvalue function called in expression"); |
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76 return octave_value_list (); |
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77 } |
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78 |
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79 octave_variable_reference |
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80 tree_expression::lvalue (void) |
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81 { |
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82 ::error ("invalid lvalue function called in expression"); |
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83 return octave_variable_reference (); |
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84 } |
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85 |
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86 string |
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87 tree_expression::original_text (void) const |
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88 { |
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89 return string (); |
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90 } |
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91 |
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92 /* |
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93 ;;; Local Variables: *** |
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94 ;;; mode: C++ *** |
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95 ;;; End: *** |
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96 */ |
