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1 /* |
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2 |
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3 Copyright (C) 1996 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 <iostream.h> |
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32 #include <strstream.h> |
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33 |
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34 #include "error.h" |
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35 #include "pager.h" |
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36 #include "pt-const.h" |
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37 #include "pt-exp-base.h" |
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38 #include "user-prefs.h" |
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39 |
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40 // Expressions. |
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41 |
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42 bool |
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43 tree_expression::is_logically_true (const char *warn_for) |
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44 { |
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45 bool expr_value = false; |
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46 |
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47 octave_value t1 = eval (false); |
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48 |
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49 if (! error_state) |
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50 { |
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51 if (t1.is_defined ()) |
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52 { |
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53 if (t1.rows () == 0 || t1.columns () == 0) |
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54 { |
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55 t1 = 0.0; |
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56 int flag = user_pref.propagate_empty_matrices; |
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57 if (flag < 0) |
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58 warning ("%s: empty matrix used in conditional expression", |
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59 warn_for); |
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60 else if (flag == 0) |
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61 { |
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62 ::error ("%s: empty matrix used in conditional expression", |
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63 warn_for); |
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64 return expr_value; |
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65 } |
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66 } |
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67 else if (! t1.is_scalar_type ()) |
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68 { |
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69 octave_value t2 = t1.all (); |
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70 if (! error_state) |
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71 t1 = t2.all (); |
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72 } |
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73 |
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74 if (! error_state) |
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75 { |
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76 if (t1.is_real_scalar ()) |
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77 expr_value = t1.double_value () != 0.0; |
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78 else if (t1.is_complex_scalar ()) |
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79 expr_value = t1.complex_value () != 0.0; |
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80 else |
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81 panic_impossible (); |
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82 } |
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83 else |
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84 ::error ("%s: invalid type in conditional expression", warn_for); |
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85 } |
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86 else |
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87 ::error ("%s: undefined value used in conditional expression", |
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88 warn_for); |
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89 } |
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90 else |
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91 ::error ("%s: error evaluating conditional expression", warn_for); |
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92 |
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93 return expr_value; |
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94 } |
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95 |
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96 void |
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97 tree_expression::mark_for_possible_ans_assign (void) |
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98 { |
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99 panic_impossible (); |
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100 } |
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101 |
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102 octave_value |
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103 tree_expression::eval (bool /* print */) |
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104 { |
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105 panic ("invalid evaluation of generic expression"); |
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106 return octave_value (); |
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107 } |
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108 |
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109 /* |
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110 ;;; Local Variables: *** |
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111 ;;; mode: C++ *** |
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112 ;;; End: *** |
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113 */ |
