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| 1 | /* microprotocols.c - minimalist and non-validating protocols implementation | ||
| 2 | * | ||
| 3 | * Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org> | ||
| 4 | * | ||
| 5 | * This file is part of psycopg and was adapted for pysqlite. Federico Di | ||
| 6 | * Gregorio gave the permission to use it within pysqlite under the following | ||
| 7 | * license: | ||
| 8 | * | ||
| 9 | * This software is provided 'as-is', without any express or implied | ||
| 10 | * warranty. In no event will the authors be held liable for any damages | ||
| 11 | * arising from the use of this software. | ||
| 12 | * | ||
| 13 | * Permission is granted to anyone to use this software for any purpose, | ||
| 14 | * including commercial applications, and to alter it and redistribute it | ||
| 15 | * freely, subject to the following restrictions: | ||
| 16 | * | ||
| 17 | * 1. The origin of this software must not be misrepresented; you must not | ||
| 18 | * claim that you wrote the original software. If you use this software | ||
| 19 | * in a product, an acknowledgment in the product documentation would be | ||
| 20 | * appreciated but is not required. | ||
| 21 | * 2. Altered source versions must be plainly marked as such, and must not be | ||
| 22 | * misrepresented as being the original software. | ||
| 23 | * 3. This notice may not be removed or altered from any source distribution. | ||
| 24 | */ | ||
| 25 | |||
| 26 | #include <Python.h> | ||
| 27 | #include <structmember.h> | ||
| 28 | |||
| 29 | #include "cursor.h" | ||
| 30 | #include "microprotocols.h" | ||
| 31 | #include "prepare_protocol.h" | ||
| 32 | |||
| 33 | |||
| 34 | /** the adapters registry **/ | ||
| 35 | |||
| 36 | PyObject *psyco_adapters; | ||
| 37 | |||
| 38 | /* microprotocols_init - initialize the adapters dictionary */ | ||
| 39 | |||
| 40 | int | ||
| 41 | microprotocols_init(PyObject *dict) | ||
| 42 | { | ||
| 43 | /* create adapters dictionary and put it in module namespace */ | ||
| 44 | if ((psyco_adapters = PyDict_New()) == NULL) { | ||
| 45 | return -1; | ||
| 46 | } | ||
| 47 | |||
| 48 | return PyDict_SetItemString(dict, "adapters", psyco_adapters); | ||
| 49 | } | ||
| 50 | |||
| 51 | |||
| 52 | /* microprotocols_add - add a reverse type-caster to the dictionary */ | ||
| 53 | |||
| 54 | int | ||
| 55 | microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast) | ||
| 56 | { | ||
| 57 | PyObject* key; | ||
| 58 | int rc; | ||
| 59 | |||
| 60 | if (proto == NULL) proto = (PyObject*)&SQLitePrepareProtocolType; | ||
| 61 | |||
| 62 | key = Py_BuildValue("(OO)", (PyObject*)type, proto); | ||
| 63 | if (!key) { | ||
| 64 | return -1; | ||
| 65 | } | ||
| 66 | |||
| 67 | rc = PyDict_SetItem(psyco_adapters, key, cast); | ||
| 68 | Py_DECREF(key); | ||
| 69 | |||
| 70 | return rc; | ||
| 71 | } | ||
| 72 | |||
| 73 | /* microprotocols_adapt - adapt an object to the built-in protocol */ | ||
| 74 | |||
| 75 | PyObject * | ||
| 76 | microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt) | ||
| 77 | { | ||
| 78 | PyObject *adapter, *key; | ||
| 79 | |||
| 80 | /* we don't check for exact type conformance as specified in PEP 246 | ||
| 81 | because the SQLitePrepareProtocolType type is abstract and there is no | ||
| 82 | way to get a quotable object to be its instance */ | ||
| 83 | |||
| 84 | /* look for an adapter in the registry */ | ||
| 85 | key = Py_BuildValue("(OO)", (PyObject*)obj->ob_type, proto); | ||
| 86 | if (!key) { | ||
| 87 | return NULL; | ||
| 88 | } | ||
| 89 | adapter = PyDict_GetItem(psyco_adapters, key); | ||
| 90 | Py_DECREF(key); | ||
| 91 | if (adapter) { | ||
| 92 | PyObject *adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL); | ||
| 93 | return adapted; | ||
| 94 | } | ||
| 95 | |||
| 96 | /* try to have the protocol adapt this object*/ | ||
| 97 | if (PyObject_HasAttrString(proto, "__adapt__")) { | ||
| 98 | PyObject *adapted = PyObject_CallMethod(proto, "__adapt__", "O", obj); | ||
| 99 | if (adapted) { | ||
| 100 | if (adapted != Py_None) { | ||
| 101 | return adapted; | ||
| 102 | } else { | ||
| 103 | Py_DECREF(adapted); | ||
| 104 | } | ||
| 105 | } | ||
| 106 | |||
| 107 | if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) | ||
| 108 | return NULL; | ||
| 109 | } | ||
| 110 | |||
| 111 | /* and finally try to have the object adapt itself */ | ||
| 112 | if (PyObject_HasAttrString(obj, "__conform__")) { | ||
| 113 | PyObject *adapted = PyObject_CallMethod(obj, "__conform__","O", proto); | ||
| 114 | if (adapted) { | ||
| 115 | if (adapted != Py_None) { | ||
| 116 | return adapted; | ||
| 117 | } else { | ||
| 118 | Py_DECREF(adapted); | ||
| 119 | } | ||
| 120 | } | ||
| 121 | |||
| 122 | if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) { | ||
| 123 | return NULL; | ||
| 124 | } | ||
| 125 | } | ||
| 126 | |||
| 127 | /* else set the right exception and return NULL */ | ||
| 128 | PyErr_SetString(ProgrammingError, "can't adapt"); | ||
| 129 | return NULL; | ||
| 130 | } | ||
| 131 | |||
| 132 | /** module-level functions **/ | ||
| 133 | |||
| 134 | PyObject * | ||
| 135 | psyco_microprotocols_adapt(Cursor *self, PyObject *args) | ||
| 136 | { | ||
| 137 | PyObject *obj, *alt = NULL; | ||
| 138 | PyObject *proto = (PyObject*)&SQLitePrepareProtocolType; | ||
| 139 | |||
| 140 | if (!PyArg_ParseTuple(args, "O|OO", &obj, &proto, &alt)) return NULL; | ||
| 141 | return microprotocols_adapt(obj, proto, alt); | ||
| 142 | } | ||