summaryrefslogtreecommitdiffstats
path: root/libshiboken/sbkconverter.h
blob: b08685989c0aaf7111a11d952144f26b67ae3547 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 * This file is part of the Shiboken Python Bindings Generator project.
 *
 * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 *
 * Contact: PySide team <contact@pyside.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef SBK_CONVERTER_H
#define SBK_CONVERTER_H

#include "sbkpython.h"
#include <limits>
#include "shibokenmacros.h"
#include "basewrapper.h"

/**
 *  This is a convenience macro identical to Python's PyObject_TypeCheck,
 *  except that the arguments have swapped places, for the great convenience
 *  of generator.
 */
#define SbkObject_TypeCheck(tp, ob) \
        (Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))

#define SbkString_Check(pyObj) (pyObj == Py_None || PyString_Check(pyObj))

extern "C"
{

/**
 *  SbkConverter is used to perform type conversions from C++
 *  to Python and vice-versa;.and it is also used for type checking.
 *  SbkConverter is a private structure that must be accessed
 *  using the functions provided by the converter API.
 */
struct SbkConverter;

/**
 *  Given a void pointer to a C++ object, this function must return
 *  the proper Python object. It may be either an existing wrapper
 *  for the C++ object, or a newly create one. Or even the Python
 *  equivalent of the C++ value passed in the argument.
 *
 *  C++ -> Python
 */
typedef PyObject* (*CppToPythonFunc)(const void*);

/**
 *  This function converts a Python object to a C++ value, it may be
 *  a pointer, value, class, container or primitive type, passed via
 *  a void pointer, that will be cast properly inside the function.
 *  This function is usually returned by an IsConvertibleToCppFunc
 *  function, or obtained knowing the type of the Python object input,
 *  thus it will not check the Python object type, and will expect
 *  the void pointer to be pointing to a proper variable.
 *
 *  Python -> C++
 */
typedef void (*PythonToCppFunc)(PyObject*,void*);

/**
 *  Checks if the Python object passed in the argument is convertible to a
 *  C++ type defined inside the function, it returns the converter function
 *  that will transform a Python argument into a C++ value.
 *  It returns NULL if the Python object is not convertible to the C++ type
 *  that the function represents.
 *
 *  Python -> C++ ?
 */
typedef PythonToCppFunc (*IsConvertibleToCppFunc)(PyObject*);

} // extern "C"

namespace Shiboken {
namespace Conversions {

/**
 *  Creates a converter for a wrapper type.
 *  \param type                  A Shiboken.ObjectType that will receive the new converter.
 *  \param toCppPointerConvFunc  Function to retrieve the C++ pointer held by a Python wrapper.
 *  \param toCppPointerCheckFunc Check and return the retriever function of the C++ pointer held by a Python wrapper.
 *  \param pointerToPythonFunc   Function to convert a C++ object to a Python \p type wrapper, keeping their identity.
 *  \param copyToPythonFunc      Function to convert a C++ object to a Python \p type, copying the object.
 *  \returns                     The new converter referred by the wrapper \p type.
 */
LIBSHIBOKEN_API SbkConverter* createConverter(SbkObjectType* type,
                                              PythonToCppFunc toCppPointerConvFunc,
                                              IsConvertibleToCppFunc toCppPointerCheckFunc,
                                              CppToPythonFunc pointerToPythonFunc,
                                              CppToPythonFunc copyToPythonFunc = 0);

/**
 *  Creates a converter for a non wrapper type (primitive or container type).
 *  \param type         Python type representing to the new converter.
 *  \param toPythonFunc Function to convert a C++ object to a Python \p type.
 *  \returns            A new type converter.
 */
LIBSHIBOKEN_API SbkConverter* createConverter(PyTypeObject* type, CppToPythonFunc toPythonFunc);

LIBSHIBOKEN_API void deleteConverter(SbkConverter* converter);

/**
 *  Adds a new conversion of a Python object to a C++ value.
 *  This is used in copy and implicit conversions.
 */
LIBSHIBOKEN_API void addPythonToCppValueConversion(SbkConverter* converter,
                                                   PythonToCppFunc pythonToCppFunc,
                                                   IsConvertibleToCppFunc isConvertibleToCppFunc);
LIBSHIBOKEN_API void addPythonToCppValueConversion(SbkObjectType* type,
                                                   PythonToCppFunc pythonToCppFunc,
                                                   IsConvertibleToCppFunc isConvertibleToCppFunc);

// C++ -> Python ---------------------------------------------------------------------------

/**
 *  Retrieves the Python wrapper object for the given \p cppIn C++ pointer object.
 *  This function is used only for Value and Object Types.
 *  Example usage:
 *      TYPE* var;
 *      PyObject* pyVar = pointerToPython(SBKTYPE, &var);
 */
LIBSHIBOKEN_API PyObject* pointerToPython(SbkObjectType* type, const void* cppIn);

/**
 *  For the given \p cppIn C++ reference it returns the Python wrapper object,
 *  always for Object Types, and when they already exist for reference types;
 *  for when the latter doesn't have an existing wrapper type, the C++ object
 *  is copied to Python.
 *  Example usage:
 *      TYPE& var = SOMETHING;
 *      PyObject* pyVar = referenceToPython(SBKTYPE, &var);
 */
LIBSHIBOKEN_API PyObject* referenceToPython(SbkObjectType* type, const void* cppIn);

/**
 *  Retrieves the Python wrapper object for the given C++ value pointed by \p cppIn.
 *  This function is used only for Value Types.
 *  Example usage:
 *      TYPE var;
 *      PyObject* pyVar = copyToPython(SBKTYPE, &var);
 */
LIBSHIBOKEN_API PyObject* copyToPython(SbkObjectType* type, const void* cppIn);
LIBSHIBOKEN_API PyObject* copyToPython(SbkConverter* converter, const void* cppIn);

// Python -> C++ ---------------------------------------------------------------------------

/**
 *  Returns a Python to C++ conversion function if the Python object is convertible to a C++ pointer.
 *  It returns NULL if the Python object is not convertible to \p type.
 */
LIBSHIBOKEN_API PythonToCppFunc isPythonToCppPointerConvertible(SbkObjectType* type, PyObject* pyIn);

/**
 *  Returns a Python to C++ conversion function if the Python object is convertible to a C++ value.
 *  The resulting converter function will create a copy of the Python object in C++, or implicitly
 *  convert the object to the expected \p type.
 *  It returns NULL if the Python object is not convertible to \p type.
 */
LIBSHIBOKEN_API PythonToCppFunc isPythonToCppValueConvertible(SbkObjectType* type, PyObject* pyIn);

/**
 *  Returns a Python to C++ conversion function if the Python object is convertible to a C++ reference.
 *  The resulting converter function will return the underlying C++ object held by the Python wrapper,
 *  or a new C++ value if it must be a implicit conversion.
 *  It returns NULL if the Python object is not convertible to \p type.
 */
LIBSHIBOKEN_API PythonToCppFunc isPythonToCppReferenceConvertible(SbkObjectType* type, PyObject* pyIn);

/// This is the same as isPythonToCppValueConvertible function.
LIBSHIBOKEN_API PythonToCppFunc isPythonToCppConvertible(SbkConverter* converter, PyObject* pyIn);

/**
 *  Returns the C++ pointer for the \p pyIn object cast to the type passed via \p desiredType.
 *  It differs from Shiboken::Object::cppPointer because it casts the pointer to a proper
 *  memory offset depending on the desired type.
 */
LIBSHIBOKEN_API void* cppPointer(PyTypeObject* desiredType, SbkObject* pyIn);

/// Converts a Python object \p pyIn to C++ and stores the result in the C++ pointer passed in \p cppOut.
LIBSHIBOKEN_API void pythonToCppPointer(SbkObjectType* type, PyObject* pyIn, void* cppOut);

/// Converts a Python object \p pyIn to C++ and copies the result in the C++ variable passed in \p cppOut.
LIBSHIBOKEN_API void pythonToCppCopy(SbkObjectType* type, PyObject* pyIn, void* cppOut);

/// Converts a Python object \p pyIn to C++, copying the result in the C++ variable passed in \p cppOut.
LIBSHIBOKEN_API void pythonToCpp(SbkConverter* converter, PyObject* pyIn, void* cppOut);

/**
 *  Helper function returned by generated convertible checking functions
 *  that returns a C++ NULL when the input Python object is None.
 */
LIBSHIBOKEN_API void nonePythonToCppNullPtr(PyObject*, void* cppOut);

/**
 *  Returns true if the \p toCpp function passed is an implicit conversion of Python \p type.
 *  It is used when C++ expects a reference argument, so it may be the same object received
 *  from Python, or another created through implicit conversion.
 */
LIBSHIBOKEN_API bool isImplicitConversion(SbkObjectType* type, PythonToCppFunc toCpp);

/// Registers a converter with a type name that may be used to retrieve the converter.
LIBSHIBOKEN_API void registerConverterName(SbkConverter* converter, const char* typeName);

/// Returns the converter for a given type name, or NULL if it wasn't registered before.
LIBSHIBOKEN_API SbkConverter* getConverter(const char* typeName);

/// Returns the converter for a primitive type.
LIBSHIBOKEN_API SbkConverter* primitiveTypeConverter(int index);

/// Returns true if a Python sequence is comprised of objects of the given \p type.
LIBSHIBOKEN_API bool checkSequenceTypes(PyTypeObject* type, PyObject* pyIn);

/// Returns true if a Python sequence is comprised of objects of a type convertible to the one represented by the given \p converter.
LIBSHIBOKEN_API bool convertibleSequenceTypes(SbkConverter* converter, PyObject* pyIn);

/// Returns true if a Python sequence is comprised of objects of a type convertible to \p type.
LIBSHIBOKEN_API bool convertibleSequenceTypes(SbkObjectType* type, PyObject* pyIn);

/// Returns true if a Python sequence can be converted to a C++ pair.
LIBSHIBOKEN_API bool checkPairTypes(PyTypeObject* firstType, PyTypeObject* secondType, PyObject* pyIn);

/// Returns true if a Python sequence can be converted to a C++ pair.
LIBSHIBOKEN_API bool convertiblePairTypes(SbkConverter* firstConverter, bool firstCheckExact, SbkConverter* secondConverter, bool secondCheckExact, PyObject* pyIn);

/// Returns true if a Python dictionary can be converted to a C++ hash or map.
LIBSHIBOKEN_API bool checkDictTypes(PyTypeObject* keyType, PyTypeObject* valueType, PyObject* pyIn);

/// Returns true if a Python dictionary can be converted to a C++ hash or map.
LIBSHIBOKEN_API bool convertibleDictTypes(SbkConverter* keyConverter, bool keyCheckExact, SbkConverter* valueConverter, bool valueCheckExact, PyObject* pyIn);

/// Returns the Python type object associated with the given \p converter.
LIBSHIBOKEN_API PyTypeObject* getPythonTypeObject(SbkConverter* converter);

/// Returns the Python type object for the given \p typeName.
LIBSHIBOKEN_API PyTypeObject* getPythonTypeObject(const char* typeName);

/// Returns true if the Python type associated with the converter is a value type.
LIBSHIBOKEN_API bool pythonTypeIsValueType(SbkConverter* converter);

/// Returns true if the Python type associated with the converter is an object type.
LIBSHIBOKEN_API bool pythonTypeIsObjectType(SbkConverter* converter);

#define SBK_PY_LONG_LONG_IDX            0
#define SBK_BOOL_IDX                    1
#define SBK_CHAR_IDX                    2
#define SBK_CONSTCHARPTR_IDX            3
#define SBK_DOUBLE_IDX                  4
#define SBK_FLOAT_IDX                   5
#define SBK_INT_IDX                     6
#define SBK_SIGNEDINT_IDX               6
#define SBK_LONG_IDX                    7
#define SBK_SHORT_IDX                   8
#define SBK_SIGNEDCHAR_IDX              9
#define SBK_STD_STRING_IDX             10
#define SBK_UNSIGNEDPY_LONG_LONG_IDX   11
#define SBK_UNSIGNEDCHAR_IDX           12
#define SBK_UNSIGNEDINT_IDX            13
#define SBK_UNSIGNEDLONG_IDX           14
#define SBK_UNSIGNEDSHORT_IDX          15
#define SBK_VOIDPTR_IDX                16

template<typename T> SbkConverter* PrimitiveTypeConverter() { return 0; }
template<> inline SbkConverter* PrimitiveTypeConverter<PY_LONG_LONG>() { return primitiveTypeConverter(SBK_PY_LONG_LONG_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<bool>() { return primitiveTypeConverter(SBK_BOOL_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<char>() { return primitiveTypeConverter(SBK_CHAR_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<const char*>() { return primitiveTypeConverter(SBK_CONSTCHARPTR_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<double>() { return primitiveTypeConverter(SBK_DOUBLE_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<float>() { return primitiveTypeConverter(SBK_FLOAT_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<int>() { return primitiveTypeConverter(SBK_INT_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<long>() { return primitiveTypeConverter(SBK_LONG_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<short>() { return primitiveTypeConverter(SBK_SHORT_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<signed char>() { return primitiveTypeConverter(SBK_SIGNEDCHAR_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<std::string>() { return primitiveTypeConverter(SBK_STD_STRING_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<unsigned PY_LONG_LONG>() { return primitiveTypeConverter(SBK_UNSIGNEDPY_LONG_LONG_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<unsigned char>() { return primitiveTypeConverter(SBK_UNSIGNEDCHAR_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<unsigned int>() { return primitiveTypeConverter(SBK_UNSIGNEDINT_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<unsigned long>() { return primitiveTypeConverter(SBK_UNSIGNEDLONG_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<unsigned short>() { return primitiveTypeConverter(SBK_UNSIGNEDSHORT_IDX); }
template<> inline SbkConverter* PrimitiveTypeConverter<void*>() { return primitiveTypeConverter(SBK_VOIDPTR_IDX); }

} } // namespace Shiboken::Conversions

struct _SbkGenericType { PyHeapTypeObject super; SbkConverter** converter; };
#define SBK_CONVERTER(pyType) (*reinterpret_cast<_SbkGenericType*>(pyType)->converter)

#endif // SBK_CONVERTER_H