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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 | +} | |