pybind.py revision 13763 
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
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8# licensed hereunder.  You may use the software subject to the license
9# terms below provided that you ensure that this notice is replicated
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11# modified or unmodified, in source code or in binary form.
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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
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22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35#
36# Authors: Andreas Sandberg
37
38from __future__ import print_function
39from __future__ import absolute_import
40
41from abc import *
42
43class PyBindExport(object):
44    __metaclass__ = ABCMeta
45
46    @abstractmethod
47    def export(self, code, cname):
48        pass
49
50class PyBindProperty(PyBindExport):
51    def __init__(self, name, cxx_name=None, writable=True):
52        self.name = name
53        self.cxx_name = cxx_name if cxx_name else name
54        self.writable = writable
55
56    def export(self, code, cname):
57        export = "def_readwrite" if self.writable else "def_readonly"
58        code('.${export}("${{self.name}}", &${cname}::${{self.cxx_name}})')
59
60class PyBindMethod(PyBindExport):
61    def __init__(self, name, cxx_name=None, args=None,
62                 return_value_policy=None):
63        self.name = name
64        self.cxx_name = cxx_name if cxx_name else name
65        self.args = args
66        self.return_value_policy = return_value_policy
67
68    def _conv_arg(self, value):
69        if isinstance(value, bool):
70            return "true" if value else "false"
71        elif isinstance(value, (float, int)):
72            return repr(value)
73        else:
74            raise TypeError("Unsupported PyBind default value type")
75
76    def export(self, code, cname):
77        arguments = [ '"${{self.name}}"', '&${cname}::${{self.cxx_name}}' ]
78        if self.return_value_policy:
79            arguments.append('pybind11::return_value_policy::'
80                             '${{self.return_value_policy}}')
81        if self.args:
82            def get_arg_decl(arg):
83                if isinstance(arg, tuple):
84                    name, default = arg
85                    return 'py::arg("%s") = %s' % (
86                        name, self._conv_arg(default))
87                else:
88                    return 'py::arg("%s")' % arg
89
90            arguments.extend(list([ get_arg_decl(a) for a in self.args ]))
91        code('.def(' + ', '.join(arguments) + ')')
92