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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 "error.h" |
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35 #include "gripes.h" |
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36 #include "oct-map.h" |
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37 #include "ov-base.h" |
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38 #include "ov-fcn-handle.h" |
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39 #include "pr-output.h" |
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40 #include "variables.h" |
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41 |
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42 DEFINE_OCTAVE_ALLOCATOR (octave_fcn_handle); |
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43 |
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44 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_handle, |
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45 "function handle", |
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46 "function handle"); |
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47 |
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48 octave_value_list |
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49 octave_fcn_handle::subsref (const std::string& type, |
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50 const std::list<octave_value_list>& idx, |
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51 int nargout) |
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52 { |
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53 octave_value_list retval; |
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54 |
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55 switch (type[0]) |
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56 { |
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57 case '(': |
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58 { |
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59 octave_function *f = function_value (); |
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60 retval = f->subsref (type, idx, nargout); |
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61 } |
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62 break; |
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63 |
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64 |
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65 case '{': |
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66 case '.': |
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67 { |
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68 std::string typ_nm = type_name (); |
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69 error ("%s cannot be indexed with %c", typ_nm.c_str (), type[0]); |
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70 } |
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71 break; |
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72 |
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73 default: |
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74 panic_impossible (); |
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75 } |
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76 |
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77 // XXX FIXME XXX -- perhaps there should be an |
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78 // octave_value_list::next_subsref member function? See also |
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79 // octave_builtin::subsref. |
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80 |
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81 if (idx.size () > 1) |
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82 retval = retval(0).next_subsref (type, idx); |
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83 |
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84 return retval; |
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85 } |
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86 |
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87 void |
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88 octave_fcn_handle::print (std::ostream& os, bool pr_as_read_syntax) const |
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89 { |
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90 print_raw (os, pr_as_read_syntax); |
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91 newline (os); |
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92 } |
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93 |
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94 void |
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95 octave_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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96 { |
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97 octave_print_internal (os, nm, pr_as_read_syntax, |
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98 current_print_indent_level ()); |
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99 } |
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100 |
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101 octave_value |
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102 make_fcn_handle (const std::string& nm) |
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103 { |
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104 octave_value retval; |
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105 |
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106 octave_value f = lookup_function (nm); |
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107 |
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108 if (f.is_function ()) |
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109 retval = octave_value (new octave_fcn_handle (f, nm)); |
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110 else |
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111 error ("error creating function handle \"@%s\"", nm.c_str ()); |
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112 |
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113 return retval; |
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114 } |
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115 |
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116 DEFUN (functions, args, , |
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117 "-*- texinfo -*-\n\ |
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118 @deftypefn {Built-in Function} {} functions (@var{fcn_handle})\n\ |
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119 Return a struct containing information about the function handle\n\ |
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120 @var{fcn_handle}.\n\ |
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121 @end deftypefn") |
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122 { |
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123 octave_value retval; |
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124 |
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125 if (args.length () == 1) |
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126 { |
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127 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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128 |
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129 if (! error_state) |
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130 { |
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131 octave_function *fcn = fh ? fh->function_value (true) : 0; |
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132 |
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133 if (fcn) |
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134 { |
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135 Octave_map m; |
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136 |
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137 std::string fh_nm = fh->fcn_name (); |
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138 |
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139 m.assign ("function", fh_nm.substr (1)); |
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140 |
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141 if (fcn->is_nested_function ()) |
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142 m.assign ("type", "subfunction"); |
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143 else |
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144 m.assign ("type", "simple"); |
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145 |
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146 std::string nm = fcn->fcn_file_name (); |
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147 |
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148 if (nm.empty ()) |
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149 m.assign ("file", "built-in function"); |
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150 else |
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151 m.assign ("file", nm); |
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152 |
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153 retval = m; |
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154 } |
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155 else |
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156 error ("functions: invalid function handle object"); |
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157 } |
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158 else |
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159 error ("functions: argument must be a function handle object"); |
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160 } |
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161 else |
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162 print_usage ("functions"); |
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163 |
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164 return retval; |
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165 } |
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166 |
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167 DEFUN (func2str, args, , |
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168 "-*- texinfo -*-\n\ |
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169 @deftypefn {Built-in Function} {} func2str (@var{fcn_handle})\n\ |
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170 Return a string containing the name of the function referenced by\n\ |
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171 the function handle @var{fcn_handle}.\n\ |
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172 @end deftypefn") |
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173 { |
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174 octave_value retval; |
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175 |
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176 if (args.length () == 1) |
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177 { |
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178 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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179 |
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180 if (! error_state && fh) |
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181 { |
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182 std::string fh_nm = fh->fcn_name (); |
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183 retval = fh_nm.substr (1); |
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184 } |
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185 else |
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186 error ("func2str: expecting valid function handle as first argument"); |
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187 } |
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188 else |
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189 print_usage ("func2str"); |
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190 |
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191 return retval; |
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192 } |
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193 |
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194 DEFUN (str2func, args, , |
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195 "-*- texinfo -*-\n\ |
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196 @deftypefn {Built-in Function} {} str2func (@var{fcn_name})\n\ |
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197 Return a function handle constructed from the string @var{fcn_name}.\n\ |
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198 @end deftypefn") |
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199 { |
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200 octave_value retval; |
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201 |
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202 if (args.length () == 1) |
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203 { |
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204 std::string nm = args(0).string_value (); |
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205 |
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206 if (! error_state) |
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207 retval = make_fcn_handle (nm); |
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208 else |
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209 error ("str2func: expecting string as first argument"); |
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210 } |
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211 else |
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212 print_usage ("str2func"); |
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213 |
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214 return retval; |
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215 } |
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216 |
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217 /* |
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218 ;;; Local Variables: *** |
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219 ;;; mode: C++ *** |
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220 ;;; End: *** |
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221 */ |
