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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 #include "parse.h" |
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42 |
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43 DEFINE_OCTAVE_ALLOCATOR (octave_fcn_handle); |
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44 |
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4612
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45 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_handle, |
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46 "function handle", |
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47 "function handle"); |
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48 |
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49 octave_fcn_handle::octave_fcn_handle (const std::string& f, |
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50 const string_vector& a, |
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51 const std::string& n) |
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52 : typ (fcn_inline), nm (n), iftext (f), ifargs (a) |
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53 { |
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54 // Find a function name that isn't already in the symbol table. |
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55 |
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56 std::string fname = "__inline__"; |
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57 |
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58 while (symbol_exist (fname)) |
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59 fname.append ("X"); |
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60 |
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61 // Form a string representing the function. |
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62 |
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63 OSSTREAM buf; |
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64 |
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65 buf << "function __retval__ = " << fname << "("; |
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66 |
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67 for (int i = 0; i < ifargs.length (); i++) |
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68 { |
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69 if (i > 0) |
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70 buf << ", "; |
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71 |
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72 buf << ifargs(i); |
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73 } |
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74 |
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75 buf << ")\n __retval__ = " << iftext << ";\nendfunction" << OSSTREAM_ENDS; |
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76 |
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77 // Parse this function and create a user function. |
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78 |
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79 octave_value eval_args (OSSTREAM_STR (buf)); |
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80 |
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81 feval ("eval", eval_args, 0); |
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82 |
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83 OSSTREAM_FREEZE (buf); |
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84 |
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85 octave_value tmp = lookup_function (fname); |
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86 |
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87 if (tmp.is_function ()) |
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88 { |
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89 fcn = tmp; |
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90 |
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91 // XXX FIXME XXX -- probably shouldn't be directly altering the |
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92 // symbol table here. |
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93 |
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94 fbi_sym_tab->clear_function (fname); |
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95 } |
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96 else |
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97 error ("inline: unable to define function"); |
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98 } |
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99 |
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100 octave_value_list |
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101 octave_fcn_handle::subsref (const std::string& type, |
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102 const std::list<octave_value_list>& idx, |
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103 int nargout) |
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104 { |
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105 octave_value_list retval; |
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106 |
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107 switch (type[0]) |
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108 { |
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109 case '(': |
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110 { |
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111 octave_function *f = function_value (); |
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112 retval = f->subsref (type, idx, nargout); |
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113 } |
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114 break; |
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115 |
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116 |
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117 case '{': |
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118 case '.': |
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119 { |
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120 std::string typ_nm = type_name (); |
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121 error ("%s cannot be indexed with %c", typ_nm.c_str (), type[0]); |
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122 } |
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123 break; |
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124 |
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125 default: |
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126 panic_impossible (); |
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127 } |
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128 |
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129 // XXX FIXME XXX -- perhaps there should be an |
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130 // octave_value_list::next_subsref member function? See also |
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131 // octave_builtin::subsref. |
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132 |
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133 if (idx.size () > 1) |
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134 retval = retval(0).next_subsref (type, idx); |
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135 |
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136 return retval; |
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137 } |
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138 |
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139 void |
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140 octave_fcn_handle::print (std::ostream& os, bool pr_as_read_syntax) const |
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141 { |
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142 print_raw (os, pr_as_read_syntax); |
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143 newline (os); |
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144 } |
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145 |
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146 void |
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147 octave_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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148 { |
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149 if (is_inline ()) |
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150 { |
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151 OSSTREAM buf; |
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152 |
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153 if (nm.empty ()) |
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154 buf << "@f("; |
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155 else |
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156 buf << nm << "("; |
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157 |
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158 for (int i = 0; i < ifargs.length (); i++) |
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159 { |
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160 if (i) |
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161 buf << ", "; |
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162 |
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163 buf << ifargs(i); |
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164 } |
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165 |
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166 buf << ") = " << iftext << OSSTREAM_ENDS; |
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167 |
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168 octave_print_internal (os, OSSTREAM_STR (buf), pr_as_read_syntax, |
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169 current_print_indent_level ()); |
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170 OSSTREAM_FREEZE (buf); |
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171 } |
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172 else |
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173 octave_print_internal (os, nm, pr_as_read_syntax, |
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174 current_print_indent_level ()); |
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175 } |
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176 |
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177 octave_value |
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178 octave_fcn_handle::convert_to_str_internal (bool, bool) const |
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179 { |
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180 octave_value retval; |
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181 |
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182 if (is_inline ()) |
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183 retval = octave_value (inline_fcn_text ()); |
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184 else |
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185 error ("convert_to_str_internal: must be an inline function"); |
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186 |
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187 return retval; |
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188 } |
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189 |
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190 octave_value |
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191 make_fcn_handle (const std::string& nm) |
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192 { |
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193 octave_value retval; |
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194 |
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195 octave_value f = lookup_function (nm); |
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196 |
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197 if (f.is_function ()) |
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198 retval = octave_value (new octave_fcn_handle (f, nm)); |
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199 else |
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200 error ("error creating function handle \"@%s\"", nm.c_str ()); |
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201 |
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202 return retval; |
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203 } |
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204 |
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205 DEFUN (inline, args, , |
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206 "-*- texinfo -*-\n\ |
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207 @deftypefn {Built-in Function} {} inline (@var{str})\n\ |
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208 @deftypefnx {Built-in Function} {} inline (@var{str}, @var{arg1}, ...)\n\ |
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209 @deftypefnx {Built-in Function} {} inline (@var{str}, @var{n})\n\ |
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210 Define a function from a string @var{str}.\n\ |
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211 \n\ |
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212 Create an inline function. Called with a single argument, the\n\ |
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213 function is assumed to have a single argument and will be defined\n\ |
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214 as the first isolated lower case character, except i or j.\n\ |
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215 \n\ |
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216 If the second and subsequent arguments are strings, they are the names of\n\ |
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217 the arguments of the function.\n\ |
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218 \n\ |
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219 If the second argument is an integer @var{n}, the arguments are\n\ |
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220 @code{\"x\"}, @code{\"P1\"}, @dots{}, @code{\"P@var{N}\"}.\n\ |
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221 @end deftypefn\n\ |
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222 @seealso{argnames, formula, vectorize}") |
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223 { |
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224 octave_value retval; |
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225 |
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226 int nargin = args.length (); |
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227 |
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228 if (nargin > 0) |
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229 { |
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230 std::string fun = args(0).string_value (); |
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231 |
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232 if (! error_state) |
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233 { |
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234 string_vector fargs; |
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235 |
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236 if (nargin == 1) |
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237 { |
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238 fargs.resize (1); |
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239 |
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240 // Find the first isolated string as the argument of the |
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241 // function. |
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242 |
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243 // XXX FIXME XXX -- use just "x" for now. |
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244 fargs(0) = "x"; |
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245 } |
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246 else if (nargin == 2 && args(1).is_numeric_type ()) |
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247 { |
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248 int n = args(1).int_value (); |
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249 |
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250 if (! error_state) |
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251 { |
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252 if (n >= 0) |
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253 { |
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254 fargs.resize (n+1); |
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255 |
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256 fargs(0) = "x"; |
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257 |
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258 for (int i = 1; i < n+1; i++) |
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259 { |
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260 OSSTREAM buf; |
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261 buf << "P" << i << OSSTREAM_ENDS; |
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262 fargs(i) = OSSTREAM_STR (buf); |
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263 OSSTREAM_FREEZE (buf); |
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264 } |
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265 } |
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266 else |
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267 { |
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268 error ("inline: numeric argument must be nonnegative"); |
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269 return retval; |
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270 } |
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271 } |
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272 else |
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273 { |
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274 error ("inline: expecting second argument to be an integer"); |
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275 return retval; |
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276 } |
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277 } |
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278 else |
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279 { |
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280 fargs.resize (nargin - 1); |
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281 |
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282 for (int i = 1; i < nargin; i++) |
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283 { |
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284 std::string s = args(i).string_value (); |
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285 |
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286 if (! error_state) |
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287 fargs(i-1) = s; |
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288 else |
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289 { |
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290 error ("inline: expecting string arguments"); |
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291 return retval; |
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292 } |
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293 } |
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294 } |
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295 |
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296 retval = octave_value (new octave_fcn_handle (fun, fargs)); |
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297 } |
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298 else |
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299 error ("inline: first argument must be a string"); |
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300 } |
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301 else |
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302 print_usage ("inline"); |
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303 |
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304 return retval; |
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305 } |
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306 |
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307 DEFUN (formula, args, , |
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308 "-*- texinfo -*-\n\ |
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309 @deftypefn {Built-in Function} {} formula (@var{fun})\n\ |
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310 Return a string representing the inline function @var{fun}.\n\ |
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311 @end deftypefn\n\ |
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312 @seealso{argnames, inline, vectorize}") |
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313 { |
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314 octave_value retval; |
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315 |
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316 int nargin = args.length (); |
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317 |
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318 if (nargin == 1) |
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319 { |
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320 octave_fcn_handle* fn = args(0).fcn_handle_value (true); |
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321 |
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322 if (fn && fn->is_inline ()) |
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323 retval = octave_value (fn->inline_fcn_text ()); |
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324 else |
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325 error ("formula: must be an inline function"); |
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326 } |
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327 else |
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328 print_usage ("formula"); |
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329 |
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330 return retval; |
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331 } |
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332 |
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333 DEFUN (argnames, args, , |
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334 "-*- texinfo -*-\n\ |
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335 @deftypefn {Built-in Function} {} argnames (@var{fun})\n\ |
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336 Return a cell array of strings containing the names of the arguments\n\ |
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337 of the inline function @var{fun}.\n\ |
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338 @end deftypefn\n\ |
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339 @seealso{argnames, inline, formula, vectorize}") |
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340 { |
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341 octave_value retval; |
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342 |
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343 int nargin = args.length (); |
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344 |
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345 if (nargin == 1) |
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346 { |
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347 octave_fcn_handle *fn = args(0).fcn_handle_value (true); |
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348 |
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349 if (fn && fn->is_inline ()) |
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350 { |
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351 string_vector t1 = fn->inline_fcn_arg_names (); |
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352 |
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353 Cell t2 (dim_vector (t1.length (), 1)); |
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354 |
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355 for (int i = 0; i < t1.length (); i++) |
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356 t2(i) = t1(i); |
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357 |
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358 retval = t2; |
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359 } |
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360 else |
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361 error ("argnames: argument must be an inline function"); |
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362 } |
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363 else |
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364 print_usage ("argnames"); |
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365 |
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366 return retval; |
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367 } |
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368 |
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369 DEFUN (vectorize, args, , |
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370 "-*- texinfo -*-\n\ |
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371 @deftypefn {Built-in Function} {} argnames (@var{fun})\n\ |
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372 Create a vectorized version of the inline function @var{fun}\n\ |
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373 by replacing all occurrences of @code{*}, @code{/}, etc., with\n\ |
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374 @code{.*}, @code{./}, etc.\n\ |
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375 @end deftypefn\n\ |
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376 @seealso{argnames, inline, formula, vectorize}") |
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377 { |
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378 octave_value retval; |
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379 |
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380 int nargin = args.length (); |
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381 |
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382 if (nargin == 1) |
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383 { |
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384 octave_fcn_handle* old = args(0).fcn_handle_value (true); |
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385 |
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386 if (old && old->is_inline ()) |
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387 { |
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388 std::string old_func = old->inline_fcn_text (); |
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389 std::string new_func; |
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390 |
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391 size_t i = 0; |
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392 |
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393 while (i < old_func.length ()) |
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394 { |
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395 std::string t1 = old_func.substr (i, 1); |
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396 |
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397 if (t1 == "*" || t1 == "/" || t1 == "\\" || t1 == "^") |
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398 { |
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399 if (i && old_func.substr (i-1, 1) != ".") |
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400 new_func.append ("."); |
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401 |
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402 // Special case for ** operator. |
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403 if (t1 == "*" && i < (old_func.length () - 1) |
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404 && old_func.substr (i+1, 1) == "*") |
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405 { |
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406 new_func.append ("*"); |
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407 i++; |
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408 } |
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409 } |
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410 new_func.append (t1); |
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411 i++; |
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412 } |
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413 |
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414 retval = octave_value (new octave_fcn_handle (new_func, old->inline_fcn_arg_names ())); |
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415 } |
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416 else |
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417 error ("vectorize: must be an inline function"); |
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418 } |
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419 else |
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420 print_usage ("vectorize"); |
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421 |
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422 return retval; |
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423 } |
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424 |
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425 /* |
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426 ;;; Local Variables: *** |
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427 ;;; mode: C++ *** |
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428 ;;; End: *** |
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429 */ |
