pybind.py revision 12803:a08f441d4d4c 
1# Copyright (c) 2017 ARM Limited
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3#
4# The license below extends only to copyright in the software and shall
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8# licensed hereunder.  You may use the software subject to the license
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15# met: redistributions of source code must retain the above copyright
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24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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