pybind.py revision 12803 
1# Copyright (c) 2017 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder.  You may use the software subject to the license
9# terms below provided that you ensure that this notice is replicated
10# unmodified and in its entirety in all distributions of the software,
11# modified or unmodified, in source code or in binary form.
12#
13# Redistribution and use in source and binary forms, with or without
14# modification, are permitted provided that the following conditions are
15# met: redistributions of source code must retain the above copyright
16# notice, this list of conditions and the following disclaimer;
17# redistributions in binary form must reproduce the above copyright
18# notice, this list of conditions and the following disclaimer in the
19# documentation and/or other materials provided with the distribution;
20# neither the name of the copyright holders nor the names of its
21# contributors may be used to endorse or promote products derived from
22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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30# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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34# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35#
36# Authors: Andreas Sandberg
37
38from abc import *
39
40class PyBindExport(object):
41    __metaclass__ = ABCMeta
42
43    @abstractmethod
44    def export(self, code, cname):
45        pass
46
47class PyBindProperty(PyBindExport):
48    def __init__(self, name, cxx_name=None, writable=True):
49        self.name = name
50        self.cxx_name = cxx_name if cxx_name else name
51        self.writable = writable
52
53    def export(self, code, cname):
54        export = "def_readwrite" if self.writable else "def_readonly"
55        code('.${export}("${{self.name}}", &${cname}::${{self.cxx_name}})')
56
57class PyBindMethod(PyBindExport):
58    def __init__(self, name, cxx_name=None, args=None):
59        self.name = name
60        self.cxx_name = cxx_name if cxx_name else name
61        self.args = args
62
63    def _conv_arg(self, value):
64        if isinstance(value, bool):
65            return "true" if value else "false"
66        elif isinstance(value, (float, int)):
67            return repr(value)
68        else:
69            raise TypeError("Unsupported PyBind default value type")
70
71    def export(self, code, cname):
72        if self.args:
73            def get_arg_decl(arg):
74                if isinstance(arg, tuple):
75                    name, default = arg
76                    return 'py::arg("%s") = %s' % (
77                        name, self._conv_arg(default))
78                else:
79                    return 'py::arg("%s")' % arg
80
81            code('.def("${{self.name}}", &${cname}::${{self.name}}, ')
82            code('    ' + \
83                 ', '.join([ get_arg_decl(a) for a in self.args ]) + ')')
84        else:
85            code('.def("${{self.name}}", &${cname}::${{self.cxx_name}})')
86