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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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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 "ov-builtin.h" |
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31 #include "ov.h" |
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32 #include "toplev.h" |
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33 #include "unwind-prot.h" |
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34 |
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35 DEFINE_OCTAVE_ALLOCATOR (octave_builtin); |
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36 |
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37 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_builtin, |
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38 "built-in function", |
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39 "built-in function"); |
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40 |
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41 // Are any of the arguments `:'? |
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42 |
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43 static bool |
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44 any_arg_is_magic_colon (const octave_value_list& args) |
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45 { |
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46 int nargin = args.length (); |
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47 |
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48 for (int i = 0; i < nargin; i++) |
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49 if (args(i).is_magic_colon ()) |
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50 return true; |
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51 |
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52 return false; |
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53 } |
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54 |
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55 octave_value_list |
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56 octave_builtin::subsref (const std::string& type, |
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57 const std::list<octave_value_list>& idx, |
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58 int nargout) |
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59 { |
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60 octave_value_list retval; |
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61 |
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62 switch (type[0]) |
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63 { |
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64 case '(': |
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65 { |
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66 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
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67 |
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68 retval = do_multi_index_op (tmp_nargout, idx.front ()); |
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69 } |
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70 break; |
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71 |
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72 case '{': |
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73 case '.': |
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74 { |
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75 std::string nm = type_name (); |
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76 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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77 } |
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78 break; |
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79 |
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80 default: |
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81 panic_impossible (); |
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82 } |
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83 |
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84 // XXX FIXME XXX -- perhaps there should be an |
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85 // octave_value_list::next_subsref member function? See also |
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86 // octave_user_function::subsref. |
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87 // |
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88 // XXX FIXME XXX -- Note that if a function call returns multiple |
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89 // values, and there is further indexing to perform, then we are |
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90 // ignoring all but the first value. Is this really what we want to |
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91 // do? If it is not, then what should happen for stat("file").size, |
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92 // for exmaple? |
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93 |
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94 if (idx.size () > 1) |
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95 retval = retval(0).next_subsref (nargout, type, idx); |
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96 |
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97 return retval; |
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98 } |
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99 |
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100 octave_value_list |
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101 octave_builtin::do_multi_index_op (int nargout, const octave_value_list& args) |
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102 { |
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103 octave_value_list retval; |
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104 |
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105 if (error_state) |
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106 return retval; |
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107 |
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108 if (any_arg_is_magic_colon (args)) |
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109 ::error ("invalid use of colon in function argument list"); |
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110 else |
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111 { |
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112 unwind_protect::begin_frame ("builtin_func_eval"); |
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113 |
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114 unwind_protect_ptr (curr_function); |
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115 unwind_protect_ptr (curr_caller_function); |
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116 |
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117 curr_caller_function = curr_function; |
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118 curr_function = this; |
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119 |
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120 retval = (*f) (args, nargout); |
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121 |
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122 unwind_protect::run_frame ("builtin_func_eval"); |
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123 } |
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124 |
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125 return retval; |
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126 } |
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127 |
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128 /* |
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129 ;;; Local Variables: *** |
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130 ;;; mode: C++ *** |
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131 ;;; End: *** |
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132 */ |
