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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 "ov-usr-fcn.h" |
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40 #include "pr-output.h" |
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41 #include "pt-pr-code.h" |
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42 #include "pt-misc.h" |
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43 #include "pt-stmt.h" |
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44 #include "pt-cmd.h" |
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45 #include "pt-exp.h" |
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46 #include "pt-assign.h" |
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47 #include "variables.h" |
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48 |
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49 DEFINE_OCTAVE_ALLOCATOR (octave_fcn_handle); |
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50 |
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51 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_handle, |
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52 "function handle", |
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53 "function handle"); |
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54 |
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55 octave_value_list |
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56 octave_fcn_handle::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 octave_function *f = function_value (); |
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67 retval = f->subsref (type, idx, nargout); |
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68 } |
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69 break; |
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70 |
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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 typ_nm = type_name (); |
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76 error ("%s cannot be indexed with %c", typ_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_builtin::subsref. |
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87 |
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88 if (idx.size () > 1) |
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89 retval = retval(0).next_subsref (type, idx); |
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90 |
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91 return retval; |
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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 (std::ostream& os, bool pr_as_read_syntax) const |
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96 { |
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97 print_raw (os, pr_as_read_syntax); |
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98 newline (os); |
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99 } |
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100 |
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101 void |
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102 octave_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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103 { |
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104 bool printed = false; |
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105 |
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106 if (nm == "@<anonymous>") |
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107 { |
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108 tree_print_code tpc (os); |
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109 |
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110 // FCN is const becuase this member function is, so we can't |
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111 // use it to call user_function_value, so we make a copy first. |
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112 |
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113 octave_value ftmp = fcn; |
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114 |
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115 octave_user_function *f = ftmp.user_function_value (); |
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116 |
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117 if (f) |
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118 { |
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119 tree_parameter_list *p = f->parameter_list (); |
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120 |
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121 os << "@("; |
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122 |
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123 if (p) |
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124 p->accept (tpc); |
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125 |
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126 os << ") "; |
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127 |
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128 tree_statement_list *b = f->body (); |
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129 |
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130 if (b) |
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131 { |
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132 assert (b->length () == 1); |
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133 |
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134 tree_statement *s = b->front (); |
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135 |
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136 if (s) |
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137 { |
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138 if (s->is_expression ()) |
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139 { |
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140 tree_expression *e = s->expression (); |
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141 |
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142 if (e) |
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143 { |
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144 if (e->is_assignment_expression ()) |
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145 { |
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146 // The parser builds an assignment to |
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147 // __retval__, and we don't want to |
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148 // display that part. |
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149 |
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150 tree_simple_assignment *tsa |
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151 = reinterpret_cast <tree_simple_assignment *> (e); |
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152 tree_expression *rhs = tsa->right_hand_side (); |
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153 |
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154 if (rhs) |
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155 rhs->accept (tpc); |
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156 } |
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157 else |
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158 e->accept (tpc); |
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159 } |
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160 } |
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161 else |
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162 { |
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163 tree_command *c = s->command (); |
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164 |
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165 tpc.suspend_newline (); |
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166 c->accept (tpc); |
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167 tpc.resume_newline (); |
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168 } |
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169 } |
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170 } |
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171 |
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172 printed = true; |
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173 } |
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174 } |
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175 |
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176 if (! printed) |
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177 octave_print_internal (os, nm, pr_as_read_syntax, |
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178 current_print_indent_level ()); |
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179 } |
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180 |
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181 octave_value |
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182 make_fcn_handle (const std::string& nm) |
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183 { |
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184 octave_value retval; |
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185 |
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186 octave_value f = lookup_function (nm); |
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187 |
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188 if (f.is_function ()) |
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189 retval = octave_value (new octave_fcn_handle (f, nm)); |
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190 else |
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191 error ("error creating function handle \"@%s\"", nm.c_str ()); |
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192 |
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193 return retval; |
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194 } |
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195 |
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196 DEFUN (functions, args, , |
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197 "-*- texinfo -*-\n\ |
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198 @deftypefn {Built-in Function} {} functions (@var{fcn_handle})\n\ |
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199 Return a struct containing information about the function handle\n\ |
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200 @var{fcn_handle}.\n\ |
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201 @end deftypefn") |
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202 { |
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203 octave_value retval; |
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204 |
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205 if (args.length () == 1) |
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206 { |
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207 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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208 |
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209 if (! error_state) |
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210 { |
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211 octave_function *fcn = fh ? fh->function_value (true) : 0; |
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212 |
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213 if (fcn) |
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214 { |
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215 Octave_map m; |
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216 |
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217 std::string fh_nm = fh->fcn_name (); |
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218 |
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219 m.assign ("function", fh_nm); |
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220 |
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221 if (fcn->is_nested_function ()) |
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222 m.assign ("type", "subfunction"); |
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223 else |
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224 m.assign ("type", "simple"); |
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225 |
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226 std::string nm = fcn->fcn_file_name (); |
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227 |
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228 if (nm.empty ()) |
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229 { |
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230 if (fh_nm == "@<anonymous>") |
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231 m.assign ("file", "none"); |
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232 else |
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233 m.assign ("file", "built-in function"); |
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234 } |
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235 else |
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236 m.assign ("file", nm); |
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237 |
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238 retval = m; |
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239 } |
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240 else |
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241 error ("functions: invalid function handle object"); |
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242 } |
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243 else |
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244 error ("functions: argument must be a function handle object"); |
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245 } |
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246 else |
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247 print_usage ("functions"); |
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248 |
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249 return retval; |
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250 } |
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251 |
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252 DEFUN (func2str, args, , |
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253 "-*- texinfo -*-\n\ |
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254 @deftypefn {Built-in Function} {} func2str (@var{fcn_handle})\n\ |
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255 Return a string containing the name of the function referenced by\n\ |
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256 the function handle @var{fcn_handle}.\n\ |
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257 @end deftypefn") |
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258 { |
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259 octave_value retval; |
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260 |
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261 if (args.length () == 1) |
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262 { |
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263 octave_fcn_handle *fh = args(0).fcn_handle_value (); |
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264 |
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265 if (! error_state && fh) |
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266 { |
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267 std::string fh_nm = fh->fcn_name (); |
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268 retval = fh_nm; |
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269 } |
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270 else |
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271 error ("func2str: expecting valid function handle as first argument"); |
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272 } |
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273 else |
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274 print_usage ("func2str"); |
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275 |
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276 return retval; |
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277 } |
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278 |
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279 DEFUN (str2func, args, , |
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280 "-*- texinfo -*-\n\ |
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281 @deftypefn {Built-in Function} {} str2func (@var{fcn_name})\n\ |
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282 Return a function handle constructed from the string @var{fcn_name}.\n\ |
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283 @end deftypefn") |
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284 { |
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285 octave_value retval; |
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286 |
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287 if (args.length () == 1) |
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288 { |
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289 std::string nm = args(0).string_value (); |
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290 |
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291 if (! error_state) |
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292 retval = make_fcn_handle (nm); |
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293 else |
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294 error ("str2func: expecting string as first argument"); |
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295 } |
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296 else |
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297 print_usage ("str2func"); |
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298 |
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299 return retval; |
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300 } |
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301 |
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302 /* |
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303 ;;; Local Variables: *** |
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304 ;;; mode: C++ *** |
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305 ;;; End: *** |
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306 */ |
