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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 "defun.h" |
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32 #include "gripes.h" |
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33 #include "oct-obj.h" |
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34 #include "ov-scalar.h" |
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35 #include "ov-re-mat.h" |
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36 #include "ov-typeinfo.h" |
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37 #include "pr-output.h" |
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38 #include "xdiv.h" |
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39 #include "xpow.h" |
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40 |
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41 octave_allocator |
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42 octave_scalar::allocator (sizeof (octave_scalar)); |
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43 |
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44 int |
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45 octave_scalar::t_id (-1); |
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46 |
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47 const string |
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48 octave_scalar::t_name ("scalar"); |
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49 |
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50 static inline bool |
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51 valid_scalar_indices (const octave_value_list& args) |
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52 { |
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53 int nargin = args.length (); |
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54 |
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55 for (int i = 0; i < nargin; i++) |
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56 if (! args(i).valid_as_scalar_index ()) |
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57 return false; |
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58 |
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59 return true; |
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60 } |
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61 |
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62 octave_value |
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63 octave_scalar::index (const octave_value_list& idx) const |
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64 { |
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65 octave_value retval; |
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66 |
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67 if (valid_scalar_indices (idx)) |
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68 retval = scalar; |
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69 else |
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70 { |
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71 // XXX FIXME XXX -- this doesn't solve the problem of |
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72 // |
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73 // a = 1; a([1,1], [1,1], [1,1]) |
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74 // |
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75 // and similar constructions. Hmm... |
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76 |
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77 // XXX FIXME XXX -- using this constructor avoids narrowing the |
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78 // 1x1 matrix back to a scalar value. Need a better solution |
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79 // to this problem. |
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80 |
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81 octave_value tmp (new octave_matrix (matrix_value ())); |
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82 |
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83 retval = tmp.index (idx); |
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84 } |
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85 |
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86 return retval; |
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87 } |
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88 |
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89 octave_value |
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90 octave_scalar::convert_to_str (void) const |
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91 { |
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92 octave_value retval; |
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93 |
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94 if (xisnan (scalar)) |
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95 ::error ("invalid conversion from NaN to character"); |
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96 else |
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97 { |
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98 // XXX FIXME XXX -- warn about out of range conversions? |
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99 |
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100 int i = NINT (scalar); |
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101 char s[2]; |
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102 s[0] = (char) i; |
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103 s[1] = '\0'; |
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104 retval = octave_value (s); |
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105 } |
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106 |
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107 return retval; |
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108 } |
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109 |
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110 void |
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111 octave_scalar::print (ostream& os, bool pr_as_read_syntax) |
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112 { |
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113 octave_print_internal (os, scalar, pr_as_read_syntax); |
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114 } |
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115 |
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116 /* |
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117 ;;; Local Variables: *** |
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118 ;;; mode: C++ *** |
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119 ;;; End: *** |
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120 */ |
