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annotate pycall.cc @ 172:29d9da90afcf

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pycall: New function to pass Octave values to a Python function * pycall.cc: Rename from py.cc. Add support for dispatching variable length Octave arguments to a Python function. * Makefile.am (OCT_FILES): Rename py.oct to pycall.oct.
author Mike Miller <mtmiller@octave.org>
date Thu, 07 Apr 2016 14:51:18 -0700
parents py.cc@eab5c6026303
children 28dc607532c2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2015-2016 Mike Miller
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4
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5 This file is part of Pytave.
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6
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7 Pytave 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 3 of the License, or (at your
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10 option) any later version.
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11
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12 Pytave 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 Pytave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (HAVE_CONFIG_H)
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24 # include <config.h>
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25 #endif
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26
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27 #include <boost/python.hpp>
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28 #include <boost/python/numeric.hpp>
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29
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30 #include <oct.h>
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31
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32 #define PYTAVE_DO_DECLARE_SYMBOL
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33 #include "arrayobjectdefs.h"
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34 #include "exceptions.h"
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35 #include "octave_to_python.h"
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36 #include "python_to_octave.h"
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37
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38 using namespace boost::python;
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39
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40 DEFUN_DLD (pycall, args, nargout,
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41 "-*- texinfo -*-\n\
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42 @deftypefn {Loadable Function} pycall (@var{func})\n\
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43 @deftypefnx {Loadable Function} {@var{x} =} pycall (@var{func})\n\
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44 @deftypefnx {Loadable Function} {@var{x} =} pycall (@var{func}, @var{arg1}, @var{arg2}, @dots{})\n\
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45 Execute method of a Python module.\n\
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46 \n\
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47 Examples:\n\
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48 @example\n\
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49 @group\n\
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50 y = pycall('__builtin__.int(6)')\n\
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51 @result{} y = 6\n\
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52 pycall('sys.version')\n\
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53 @result{} ans = ...\n\
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54 pycall('__builtin__.eval(\"4+5\")')\n\
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55 @result{} ans = 9\n\
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56 pycall('__builtin__.dict(one=1,two=2)')\n\
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57 @result{} ans =\n\
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58 scalar structure containing the fields:\n\
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59 two = 2\n\
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60 one = 1\n\
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61 @end group\n\
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62 @end example\n\
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63 @end deftypefn")
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64 {
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65 octave_value_list retval;
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66
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67 int nargin = args.length ();
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68
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69 if (nargin < 1)
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70 {
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71 print_usage ();
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72 return retval;
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73 }
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74
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75 std::string module;
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76 std::string func = args(0).string_value ();
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77
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78 size_t idx = func.rfind (".");
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79 if (idx != std::string::npos)
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80 {
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81 module = func.substr (0, idx);
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82 func = func.substr (idx + 1);
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83 }
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84
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85 Py_Initialize ();
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86
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87 pytave::init_exceptions ();
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88 numeric::array::set_module_and_type ("numpy", "ndarray");
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89 _import_array ();
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90
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91 try
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92 {
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93 object main_module = import ("__main__");
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94 object main_namespace = main_module.attr ("__dict__");
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95
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96 object mod = (module.empty ()) ? main_module : import (module.c_str ());
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97 object callable = mod.attr (func.c_str ());
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98
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99 std::vector<object> pyargs;
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100 for (int i = 1; i < nargin; i++)
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101 {
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102 object arg;
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103 pytave::octvalue_to_pyobj (arg, args(i));
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104 pyargs.push_back (arg);
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105 }
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106
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107 object res;
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108
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109 switch (nargin - 1)
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110 {
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111 case 0:
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112 res = callable ();
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113 break;
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114 case 1:
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115 res = callable (pyargs[0]);
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116 break;
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117 case 2:
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118 res = callable (pyargs[0], pyargs[1]);
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119 break;
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120 case 3:
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121 res = callable (pyargs[0], pyargs[1], pyargs[2]);
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122 break;
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123 case 4:
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124 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3]);
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125 break;
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126 case 5:
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127 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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128 pyargs[4]);
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129 break;
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130 case 6:
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131 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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132 pyargs[4], pyargs[5]);
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133 break;
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134 case 7:
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135 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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136 pyargs[4], pyargs[5], pyargs[6]);
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137 break;
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138 case 8:
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139 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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140 pyargs[4], pyargs[5], pyargs[6], pyargs[7]);
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141 break;
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142 case 9:
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143 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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144 pyargs[4], pyargs[5], pyargs[6], pyargs[7],
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145 pyargs[8]);
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146 break;
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147 case 10:
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148 res = callable (pyargs[0], pyargs[1], pyargs[2], pyargs[3],
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149 pyargs[4], pyargs[5], pyargs[6], pyargs[7],
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150 pyargs[8], pyargs[9]);
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151 break;
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152 default:
29d9da90afcf pycall: New function to pass Octave values to a Python function
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153 error ("pycall: more than 10 arguments are not yet supported");
29d9da90afcf pycall: New function to pass Octave values to a Python function
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154 break;
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155 }
115
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156
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157 if (! res.is_none ())
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158 {
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159 octave_value val;
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160 pytave::pyobj_to_octvalue (val, res);
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161 retval(0) = val;
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162 }
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163 }
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164 catch (pytave::object_convert_exception const &)
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165 {
172
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166 error ("pycall: error in return value type conversion");
115
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167 }
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168 catch (error_already_set const &)
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169 {
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170 PyObject *ptype, *pvalue, *ptraceback;
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171 PyErr_Fetch (&ptype, &pvalue, &ptraceback);
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172
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173 try
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174 {
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175 std::string message = extract<std::string> (pvalue);
172
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176 error ("pycall: %s", message.c_str ());
115
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177 }
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178 catch (error_already_set const &)
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179 {
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180 PyErr_Restore (ptype, pvalue, ptraceback);
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181 PyErr_Print ();
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182 }
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183 }
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184
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185 return retval;
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186 }
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187