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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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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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 "error.h" |
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32 #include "oct-obj.h" |
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33 #include "ov-builtin.h" |
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34 #include "ov.h" |
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35 |
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36 DEFINE_OCTAVE_ALLOCATOR (octave_builtin); |
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37 |
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38 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_builtin, "built-in function"); |
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39 |
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40 // Are any of the arguments `:'? |
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41 |
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42 static bool |
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43 any_arg_is_magic_colon (const octave_value_list& args) |
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44 { |
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45 int nargin = args.length (); |
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46 |
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47 for (int i = 0; i < nargin; i++) |
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48 if (args(i).is_magic_colon ()) |
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49 return true; |
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50 |
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51 return false; |
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52 } |
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53 |
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54 octave_value_list |
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55 octave_builtin::subsref (const std::string& type, |
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56 const std::list<octave_value_list>& idx, |
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57 int nargout) |
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58 { |
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59 octave_value_list retval; |
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60 |
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61 switch (type[0]) |
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62 { |
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63 case '(': |
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64 retval = do_multi_index_op (nargout, idx.front ()); |
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65 break; |
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66 |
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67 case '{': |
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68 case '.': |
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69 { |
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70 std::string nm = type_name (); |
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71 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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72 } |
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73 break; |
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74 |
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75 default: |
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76 panic_impossible (); |
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77 } |
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78 |
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79 // XXX FIXME XXX -- perhaps there should be an |
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80 // octave_value_list::next_subsref member function? See also |
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81 // octave_user_function::subsref. |
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82 // |
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83 // XXX FIXME XXX -- Note that if a function call returns multiple |
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84 // values, and there is further indexing to perform, then we are |
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85 // ignoring all but the first value. Is this really what we want to |
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86 // do? If it is not, then what should happen for stat("file").size, |
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87 // for exmaple? |
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88 |
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89 if (idx.size () > 1) |
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90 retval = retval(0).next_subsref (type, idx); |
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91 |
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92 return retval; |
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93 } |
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94 |
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95 octave_value_list |
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96 octave_builtin::do_multi_index_op (int nargout, const octave_value_list& args) |
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97 { |
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98 octave_value_list retval; |
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99 |
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100 if (error_state) |
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101 return retval; |
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102 |
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103 if (any_arg_is_magic_colon (args)) |
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104 ::error ("invalid use of colon in function argument list"); |
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105 else |
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106 retval = (*f) (args, nargout); |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 /* |
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112 ;;; Local Variables: *** |
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113 ;;; mode: C++ *** |
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114 ;;; End: *** |
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115 */ |
