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Add test of multivariable output from subsref * @pyobject/subsref.m: Add test.
author Colin Macdonald <cbm@m.fsf.org>
date Wed, 03 Aug 2016 20:26:57 -0700
parents e7ee2c2e64e8
children d9f9156a13c9
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1 ## Copyright (C) 2016 Colin B. Macdonald
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2 ##
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3 ## This file is part of Pytave
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4 ##
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5 ## Pytave is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; either version 3 of the License,
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8 ## or (at your option) any later version.
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9 ##
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10 ## This software is distributed in the hope that it will be useful,
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11 ## but WITHOUT ANY WARRANTY; without even the implied warranty
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12 ## of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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13 ## the GNU General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public
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16 ## License along with this software; see the file COPYING.
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17 ## If not, see <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @documentencoding UTF-8
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21 ## @defop Method @@pyobject subsref (@var{x}, @var{idx})
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22 ## @defopx Operator @@pyobject {@var{x}.@var{property}} {}
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23 ## @defopx Operator @@pyobject {@var{x}.@var{method}(@var{a}, @dots{})} {}
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24 ## @defopx Operator @@pyobject {@var{x}@{@var{i}@}} {}
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25 ## @defopx Operator @@pyobject {@var{x}@{@var{i}, @var{j}, @dots{}@}} {}
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26 ## @defopx Operator @@pyobject {@var{x}(@var{a})} {}
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27 ## @defopx Operator @@pyobject {@var{x}(@var{a}, @var{b}, @dots{})} {}
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28 ## Call methods and access properties of a Python object.
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29 ##
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30 ##
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31 ## @seealso{@@pyobject/subsasgn}
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32 ## @end defop
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33
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34
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35 function varargout = subsref (x, idx)
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36
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37 t = idx(1);
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38 switch t.type
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39 case "()"
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40 r = pycall (x, t.subs{:});
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41
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42 case "."
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43 assert (ischar (t.subs))
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44 r = pycall ("getattr", x, t.subs);
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45
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46 case "{}"
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47 ## Subtract one from index: do this for lists, numpy arrays, etc
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48 pyexec ("import collections")
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49 pyexec ("import numpy")
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50 x_is_list = pycall (pyeval (
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51 "lambda x: isinstance(x, (collections.Sequence, numpy.ndarray))"),
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52 x);
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53 for i = 1:length(t.subs)
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54 j = t.subs{i};
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55 if (isindex (j) && isnumeric (j) && x_is_list)
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56 t.subs{i} = cast (j, class (sizemax ())) - 1;
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57 endif
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58 endfor
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59
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60 if (ischar (t.subs{1}) && strcmp (t.subs{1}, ":"))
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61 is_map = pyeval ("lambda x: isinstance(x, collections.Mapping)");
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62 if (pycall (is_map, x))
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63 ind = ":";
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64 else
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65 ind = int32 ([1:length(x)] - 1);
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66 endif
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67 elseif (isscalar (t.subs))
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68 ind = t.subs{1};
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69 else
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70 ## XXX: after #26, #27, I think its just:
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71 #ind = pycall ("tuple", t.subs);
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72 pyexec (["global _temp\n" ...
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73 "def pystoretemp(x):\n" ...
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74 " global _temp\n" ...
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75 " _temp = x"]);
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76 pycall ("pystoretemp", t.subs);
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77 pyexec ("_temp = tuple(_temp[0])");
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78 ind = pyobject.fromPythonVarName ("_temp");
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79 endif
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80
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81 gi = pycall ("getattr", x, "__getitem__"); # x.__getitem__
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82 if (isnumeric (ind) && length (ind) > 1)
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83 r = {};
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84 for k = 1:length (ind)
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85 r(end+1) = pycall (gi, ind(k));
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86 endfor
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87 else
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88 r = pycall (gi, ind);
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89 endif
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90
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91 otherwise
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92 t
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93 error ("@pyobject/subsref: not implemented")
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94 endswitch
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95
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96 ## deal with additional indexing (might be recursive)
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97 if (length (idx) > 1)
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98 r = subsref (r, idx(2:end));
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99 endif
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100
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101 ## unpack results, ensure "ans" works (see also pycall)
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102 is_none = pyeval ("lambda x: x is None");
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103 if (nargout == 0 && ! pycall (is_none, r))
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104 varargout{1} = r;
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105 elseif (nargout == 1)
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106 varargout{1} = r;
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107 elseif (nargout >= 2)
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108 assert (length (r) == nargout, ...
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109 "pyobject/subsref: number of outputs must match")
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110 [varargout{1:nargout}] = subsref (r, struct ("type", "{}", "subs", {{1:nargout}}));
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111 endif
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112 endfunction
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113
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114
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115 %!test
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116 %! % list indexing
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117 %! pyexec ("L = [10, 20]")
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118 %! L = pyobject.fromPythonVarName ("L");
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119 %! assert (L{1}, 10)
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120 %! assert (L{2}, 20)
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121
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122 %!test
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123 %! % list indexing, slice
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124 %! pyexec ("L = [10, 20, [30, 40]]")
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125 %! L = pyobject.fromPythonVarName ("L");
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126 %! L2 = L{:};
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127 %! assert (L2{1}, 10)
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128 %! assert (L2{2}, 20)
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129 %! assert (L2{3}{1}, 30)
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130 %! assert (L2{3}{2}, 40)
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131
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132 %!test
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133 %! % list indexing, nested list
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134 %! pyexec ("L = [1, 2, [10, 11, 12]]")
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135 %! L = pyobject.fromPythonVarName ("L");
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136 %! assert (L{2}, 2)
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137 %! assert (L{3}{1}, 10)
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138 %! assert (L{3}{3}, 12)
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139
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140 %!test
299
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141 %! % list indexing, assign to vars
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142 %! L = pyeval ("[1, 2, 'Octave']");
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143 %! [a, b, c] = L{:};
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144 %! assert (a, 1)
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145 %! assert (b, 2)
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146 %! assert (c, "Octave")
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147
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148 %!test
221
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149 %! % 2D array indexing
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150 %! pyexec ("import numpy")
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151 %! pyexec ("A = numpy.array([[1, 2], [3, 4]])")
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152 %! A = pyobject.fromPythonVarName ("A");
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153 %! assert (A{1, 1}, 1)
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154 %! assert (A{2, 1}, 3)
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155 %! assert (A{1, 2}, 2)
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156
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157 %!test
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158 %! % dict: str key access
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159 %! pyexec ("d = {'one':1, 5:5, 6:6}")
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160 %! d = pyobject.fromPythonVarName ("d");
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161 %! assert (d{"one"}, 1)
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162
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163 %!test
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164 %! % dict: integer key access
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165 %! pyexec ("d = {5:42, 6:42}")
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166 %! d = pyobject.fromPythonVarName ("d");
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167 %! assert (d{6}, 42)
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168
260
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169 %!test
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170 %! % dict: integer key should not subtract one
221
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171 %! pyexec ("d = {5:40, 6:42}")
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172 %! d = pyobject.fromPythonVarName ("d");
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173 %! assert (d{6}, 42)
240
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174
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175 %!test
260
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176 %! % dict: floating point keys should work
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177 %! pyexec ("d = {5.5:'ok'}")
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178 %! d = pyobject.fromPythonVarName ("d");
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179 %! assert (d{5.5}, "ok")
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180
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181 %!test
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182 %! % dict: make sure key ":" doesn't break anything
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183 %! pyexec ("d = {'a':1, ':':2}")
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184 %! d = pyobject.fromPythonVarName ("d");
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185 %! assert (d{'a'}, 1)
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186 %! assert (d{':'}, 2)
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187
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188 %!test
240
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189 %! % method call with args
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190 %! s = pyeval ("set({1, 2})");
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191 %! s.add (42)
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192 %! assert (length (s) == 3)
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193
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194 %!test
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195 %! % get a callable
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196 %! s = pyeval ("set({1, 2})");
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197 %! sa = s.add;
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198 %! assert (isa (sa, "pyobject"))
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199 %! % and then call it
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200 %! sa (42)
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201 %! assert (length (s) == 3)
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202
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203 %!test
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204 %! % callable can return something
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205 %! s = pyeval ("set({1, 2})");
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206 %! v = s.pop ();
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207 %! assert (length (s) == 1)
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208 %! assert (v == 1 || v == 2)
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209
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210 %!test
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211 %! % chain
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212 %! pyexec ("import sys")
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213 %! s = pyeval ("set({sys})");
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214 %! ver = s.pop ().version;
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215 %! assert (ischar (ver))
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diff changeset
216
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217 %!test
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218 %! % don't set "ans" if no return value
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219 %! s = pyeval ("set({1, 2})");
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220 %! sa = s.add;
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221 %! clear ans
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222 %! sa (42)
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223 %! assert (! exist ("ans", "var"))
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parents: 227
diff changeset
224
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225 %!test
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226 %! % *do* set "ans" if return value
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227 %! s = pyeval ("set({1, 2})");
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228 %! clear ans
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229 %! s.pop ();
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230 %! assert (exist ("ans", "var"))
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parents: 227
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231 %! assert (length (s) == 1)
274
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232
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233 %!test
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234 %! % multiple return values: can get all of them
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235 %! f = pyeval ("lambda: (1, 2, 3)");
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236 %! a = f ();
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237 %! assert (length (a) == 3)
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238
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239 %!test
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240 %! % multiple return values: separate them
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241 %! f = pyeval ("lambda: (1, 2, 3)");
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242 %! [a, b, c] = f ();
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243 %! assert (a, 1)
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244 %! assert (b, 2)
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parents: 248
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245 %! assert (c, 3)
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246
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247 %!test
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parents: 248
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248 %! % multiple return values: set ans
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249 %! f = pyeval ("lambda: (1, 2, 3)");
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250 %! f ();
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251 %! assert (length (ans) == 3)
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diff changeset
252
290
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253 %!test
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254 %! % ensure None is returned if nargout > 0
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parents: 288
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255 %! L = pyeval ("[1, None, 3]");
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parents: 288
diff changeset
256 %! a = L{2};
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Abhinav Tripathi <genuinelucifer@gmail.com>
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diff changeset
257 %! assert (char (a), "None")
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parents: 288
diff changeset
258
274
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259 %!error <outputs must match>
decd3bd7da7e Partial support for multiple outputs from callables
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260 %! % multiple return values: too many outputs
decd3bd7da7e Partial support for multiple outputs from callables
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261 %! f = pyeval ("lambda: (1, 2)");
decd3bd7da7e Partial support for multiple outputs from callables
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262 %! [a, b, c] = f ();
decd3bd7da7e Partial support for multiple outputs from callables
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parents: 248
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263
decd3bd7da7e Partial support for multiple outputs from callables
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parents: 248
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264 %!error <outputs must match>
decd3bd7da7e Partial support for multiple outputs from callables
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265 %! % multiple return values: not enough outputs
decd3bd7da7e Partial support for multiple outputs from callables
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parents: 248
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266 %! f = pyeval ("lambda: (1, 2, 3)");
decd3bd7da7e Partial support for multiple outputs from callables
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parents: 248
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267 %! [a, b] = f ();