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1 /* |
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2 |
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3 Copyright (C) 2003 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 <iostream> |
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32 |
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33 #include "defun.h" |
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34 #include "oct-map.h" |
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35 #include "ov-base.h" |
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36 #include "ov-fcn-handle.h" |
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37 #include "pr-output.h" |
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38 #include "variables.h" |
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39 |
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40 DEFINE_OCTAVE_ALLOCATOR (octave_fcn_handle); |
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41 |
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42 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_handle, "function handle"); |
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43 |
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44 void |
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45 octave_fcn_handle::print (std::ostream& os, bool pr_as_read_syntax) const |
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46 { |
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47 print_raw (os, pr_as_read_syntax); |
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48 newline (os); |
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49 } |
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50 |
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51 void |
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52 octave_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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53 { |
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54 indent (os); |
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55 os << "@" << name (); |
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56 } |
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57 |
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58 octave_value |
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59 make_fcn_handle (const std::string& nm) |
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60 { |
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61 octave_value retval; |
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62 |
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63 octave_function *f = lookup_function (nm); |
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64 |
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65 if (f) |
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66 { |
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67 octave_fcn_handle fh (f, nm); |
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68 |
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69 retval = octave_value (fh); |
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70 } |
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71 else |
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72 error ("error creating function handle \"@%s\"", nm.c_str ()); |
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73 |
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74 return retval; |
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75 } |
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76 |
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77 DEFUN (functions, args, , |
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78 "-*- texinfo -*-\n\ |
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79 @deftypefn {Built-in Function} {} functions (@var{fcn_handle})\n\ |
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80 Return a struct containing information about the function handle\n\ |
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81 @var{fcn_handle}.\n\ |
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82 @end deftypefn") |
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83 { |
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84 octave_value retval; |
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85 |
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86 if (args.length () == 1) |
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87 { |
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88 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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89 |
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90 if (! error_state) |
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91 { |
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92 octave_function *fcn = fh ? fh->function_value (true) : 0; |
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93 |
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94 if (fcn) |
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95 { |
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96 Octave_map m; |
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97 |
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98 m ["function"](0) = fh->name (); |
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99 |
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100 if (fcn->is_nested_function ()) |
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101 m ["type"](0) = "subfunction"; |
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102 else |
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103 m ["type"](0) = "simple"; |
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104 |
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105 std::string nm = fcn->fcn_file_name (); |
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106 |
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107 if (nm.empty ()) |
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108 m ["file"](0) = "built-in function"; |
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109 else |
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110 m ["file"](0) = nm; |
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111 |
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112 retval = m; |
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113 } |
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114 else |
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115 error ("functions: invalid function handle object"); |
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116 } |
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117 else |
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118 error ("functions: argument must be a function handle object"); |
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119 } |
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120 else |
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121 print_usage ("functions"); |
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122 |
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123 return retval; |
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124 } |
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125 |
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126 DEFUN (func2str, args, , |
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127 "-*- texinfo -*-\n\ |
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128 @deftypefn {Built-in Function} {} func2str (@var{fcn_handle})\n\ |
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129 Return a string containing the name of the function referenced by\n\ |
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130 the function handle @var{fcn_handle}.\n\ |
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131 @end deftypefn") |
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132 { |
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133 octave_value retval; |
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134 |
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135 if (args.length () == 1) |
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136 { |
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137 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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138 |
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139 if (! error_state && fh) |
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140 retval = fh->name (); |
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141 else |
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142 error ("func2str: expecting valid function handle as first argument"); |
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143 } |
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144 else |
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145 print_usage ("func2str"); |
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146 |
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147 return retval; |
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148 } |
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149 |
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150 DEFUN (str2func, args, , |
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151 "-*- texinfo -*-\n\ |
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152 @deftypefn {Built-in Function} {} str2func (@var{fcn_name})\n\ |
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153 Return a function handle constructed from the string @var{fcn_name}.\n\ |
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154 @end deftypefn") |
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155 { |
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156 octave_value retval; |
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157 |
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158 if (args.length () == 1) |
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159 { |
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160 std::string nm = args(0).string_value (); |
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161 |
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162 if (! error_state) |
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163 retval = make_fcn_handle (nm); |
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164 else |
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165 error ("str2func: expecting string as first argument"); |
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166 } |
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167 else |
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168 print_usage ("str2func"); |
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169 |
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170 return retval; |
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171 } |
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172 |
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173 /* |
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174 ;;; Local Variables: *** |
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175 ;;; mode: C++ *** |
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176 ;;; End: *** |
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177 */ |
