yajl.c

/*
 * Copyright 2009, R. Tyler Ballance <tyler@monkeypox.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *  3. Neither the name of R. Tyler Ballance nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#include <Python.h>

#include "py_yajl.h"

static PyMethodDef yajldecoder_methods[] = {
    {"decode", (PyCFunction)(py_yajldecoder_decode), METH_VARARGS, NULL},
    {NULL}
};

static PyMethodDef yajlencoder_methods[] = {
    {"encode", (PyCFunction)(py_yajlencoder_encode), METH_VARARGS, NULL},
    {"default", (PyCFunction)(py_yajlencoder_default), METH_VARARGS, NULL},
    {NULL}
};

static PyTypeObject YajlDecoderType = {
#ifdef IS_PYTHON3
    PyVarObject_HEAD_INIT(NULL, 0)
#else
    PyObject_HEAD_INIT(NULL)
    0,                         /*ob_size*/
#endif
    "yajl.YajlDecoder",        /*tp_name*/
    sizeof(_YajlDecoder),      /*tp_basicsize*/
    0,                         /*tp_itemsize*/
    (destructor)yajldecoder_dealloc,       /*tp_dealloc*/
    0,                         /*tp_print*/
    0,                         /*tp_getattr*/
    0,                         /*tp_setattr*/
    0,                         /*tp_compare*/
    0,                         /*tp_repr*/
    0,                         /*tp_as_number*/
    0,                         /*tp_as_sequence*/
    0,                         /*tp_as_mapping*/
    0,                         /*tp_hash */
    0,                         /*tp_call*/
    0,                         /*tp_str*/
    0,                         /*tp_getattro*/
    0,                         /*tp_setattro*/
    0,                         /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,        /*tp_flags*/
    "Yajl-based decoder",      /* tp_doc */
    0,                     /* tp_traverse */
    0,                     /* tp_clear */
    0,                     /* tp_richcompare */
    0,                     /* tp_weaklistoffset */
    0,                     /* tp_iter */
    0,                     /* tp_iternext */
    yajldecoder_methods,  /* tp_methods */
    NULL,                 /* tp_members */
    0,                         /* tp_getset */
    0,                         /* tp_base */
    0,                         /* tp_dict */
    0,                         /* tp_descr_get */
    0,                         /* tp_descr_set */
    0,                         /* tp_dictoffset */
    (initproc)(yajldecoder_init),/* tp_init */
    0,                         /* tp_alloc */
};

static PyTypeObject YajlEncoderType = {
#ifdef IS_PYTHON3
    PyVarObject_HEAD_INIT(NULL, 0)
#else
    PyObject_HEAD_INIT(NULL)
    0,                         /*ob_size*/
#endif
    "yajl.YajlEncoder",        /*tp_name*/
    sizeof(_YajlEncoder),      /*tp_basicsize*/
    0,                         /*tp_itemsize*/
    (destructor)yajlencoder_dealloc,       /*tp_dealloc*/
    0,                         /*tp_print*/
    0,                         /*tp_getattr*/
    0,                         /*tp_setattr*/
    0,                         /*tp_compare*/
    0,                         /*tp_repr*/
    0,                         /*tp_as_number*/
    0,                         /*tp_as_sequence*/
    0,                         /*tp_as_mapping*/
    0,                         /*tp_hash */
    0,                         /*tp_call*/
    0,                         /*tp_str*/
    0,                         /*tp_getattro*/
    0,                         /*tp_setattro*/
    0,                         /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,        /*tp_flags*/
    "Yajl-based encoder",      /* tp_doc */
    0,                     /* tp_traverse */
    0,                     /* tp_clear */
    0,                     /* tp_richcompare */
    0,                     /* tp_weaklistoffset */
    0,                     /* tp_iter */
    0,                     /* tp_iternext */
    yajlencoder_methods,  /* tp_methods */
    NULL,                 /* tp_members */
    0,                         /* tp_getset */
    0,                         /* tp_base */
    0,                         /* tp_dict */
    0,                         /* tp_descr_get */
    0,                         /* tp_descr_set */
    0,                         /* tp_dictoffset */
    (initproc)(yajlencoder_init),/* tp_init */
    0,                         /* tp_alloc */
};

static PyObject *py_loads(PYARGS)
{
    PyObject *decoder = NULL;
    PyObject *result = NULL;
    char *buffer = NULL;
    unsigned int buflen = 0;

    if (!PyArg_ParseTuple(args, "z#", &buffer, &buflen)) {
        return NULL;
    }

    decoder = PyObject_Call((PyObject *)(&YajlDecoderType), NULL, NULL);
    if (decoder == NULL) {
        return NULL;
    }

    result = _internal_decode((_YajlDecoder *)decoder, buffer, buflen);
    Py_XDECREF(decoder);
    return result;
}

static char *__config_gen_config(PyObject *indent, yajl_gen_config *config)
{
    long indentLevel = -1;
    char *spaces = NULL;

    if (!indent)
        return NULL;

    if ((indent != Py_None) && (!PyLong_Check(indent))
#ifndef IS_PYTHON3
            && (!PyInt_Check(indent))
#endif
    ) {
        PyErr_SetObject(PyExc_TypeError,
                PyUnicode_FromString("`indent` must be int or None"));
        return NULL;
    }

    if (indent != Py_None) {
        indentLevel = PyLong_AsLong(indent);

        if (indentLevel >= 0) {
            config->beautify = 1;
            if (indentLevel == 0) {
                config->indentString = "";
            }
            else {
                spaces = (char *)(malloc(sizeof(char) * (indentLevel + 1)));
                memset((void *)(spaces), (int)' ', indentLevel);
                spaces[indentLevel] = '\0';
                config->indentString = spaces;
            }
        }
    }
    return spaces;
}

static PyObject *py_dumps(PYARGS)
{
    PyObject *encoder = NULL;
    PyObject *obj = NULL;
    PyObject *result = NULL;
    PyObject *indent = NULL;
    yajl_gen_config config = { 0, NULL };
    static char *kwlist[] = {"object", "indent", NULL};
    char *spaces = NULL;

    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|O", kwlist, &obj, &indent)) {
        return NULL;
    }

    spaces = __config_gen_config(indent, &config);
    if (PyErr_Occurred()) {
        return NULL;
    }

    encoder = PyObject_Call((PyObject *)(&YajlEncoderType), NULL, NULL);
    if (encoder == NULL) {
        return NULL;
    }

    result = _internal_encode((_YajlEncoder *)encoder, obj, config);
    Py_XDECREF(encoder);
    if (spaces) {
        free(spaces);
    }
    return result;
}

static PyObject *__read = NULL;
static PyObject *_internal_stream_load(PyObject *args, unsigned int blocking)
{
    PyObject *decoder = NULL;
    PyObject *stream = NULL;
    PyObject *buffer = NULL;
    PyObject *result = NULL;
#ifdef IS_PYTHON3
    PyObject *bufferstring = NULL;
#endif

    if (!PyArg_ParseTuple(args, "O", &stream)) {
        goto bad_type;
    }

    if (__read == NULL) {
        __read = PyUnicode_FromString("read");
    }

    if (!PyObject_HasAttr(stream, __read)) {
        goto bad_type;
    }

    buffer = PyObject_CallMethodObjArgs(stream, __read, NULL);

    if (!buffer)
        return NULL;

#ifdef IS_PYTHON3
    bufferstring = PyUnicode_AsUTF8String(buffer);
    if (!bufferstring)
        return NULL;
#endif

    decoder = PyObject_Call((PyObject *)(&YajlDecoderType), NULL, NULL);
    if (decoder == NULL) {
        return NULL;
    }

#ifdef IS_PYTHON3
    result = _internal_decode((_YajlDecoder *)decoder, PyBytes_AsString(bufferstring),
                PyBytes_Size(bufferstring));
    Py_XDECREF(bufferstring);
#else
    result = _internal_decode((_YajlDecoder *)decoder, PyString_AsString(buffer),
                  PyString_Size(buffer));
#endif
    Py_XDECREF(decoder);
    Py_XDECREF(buffer);
    return result;

bad_type:
    PyErr_SetObject(PyExc_TypeError, PyUnicode_FromString("Must pass a single stream object"));
    return NULL;
}

static PyObject *py_load(PYARGS)
{
    return _internal_stream_load(args, 1);
}
static PyObject *py_iterload(PYARGS)
{
    return _internal_stream_load(args, 0);
}

static PyObject *__write = NULL;
static PyObject *_internal_stream_dump(PyObject *object, PyObject *stream, unsigned int blocking,
            yajl_gen_config config)
{
    PyObject *encoder = NULL;
    PyObject *buffer = NULL;

    if (__write == NULL) {
        __write = PyUnicode_FromString("write");
    }

    if (!PyObject_HasAttr(stream, __write)) {
        goto bad_type;
    }

    encoder = PyObject_Call((PyObject *)(&YajlEncoderType), NULL, NULL);
    if (encoder == NULL) {
        return NULL;
    }

    buffer = _internal_encode((_YajlEncoder *)encoder, object, config);
    PyObject_CallMethodObjArgs(stream, __write, buffer, NULL);
    Py_XDECREF(encoder);
    return Py_True;

bad_type:
    PyErr_SetObject(PyExc_TypeError, PyUnicode_FromString("Must pass a stream object"));
    return NULL;
}

static PyObject *py_dump(PYARGS)
{
    PyObject *object = NULL;
    PyObject *indent = NULL;
    PyObject *stream = NULL;
    PyObject *result = NULL;
    yajl_gen_config config = { 0, NULL };
    static char *kwlist[] = {"object", "stream", "indent", NULL};
    char *spaces = NULL;

    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "OO|O", kwlist, &object, &stream, &indent)) {
        return NULL;
    }

    spaces = __config_gen_config(indent, &config);
    if (PyErr_Occurred()) {
        return NULL;
    }
    result = _internal_stream_dump(object, stream, 0, config);
    if (spaces) {
        free(spaces);
    }
    return result;
}

static PyObject *py_monkeypatch(PYARGS)
{
    PyObject *sys = PyImport_ImportModule("sys");
    PyObject *modules = PyObject_GetAttrString(sys, "modules");
    PyObject *yajl = PyDict_GetItemString(modules, "yajl");

    if (!yajl) {
        return Py_False;
    }

    PyDict_SetItemString(modules, "json_old", PyDict_GetItemString(modules, "json"));
    PyDict_SetItemString(modules, "json", yajl);

    Py_XDECREF(sys);
    Py_XDECREF(modules);
    return Py_True;
}

static struct PyMethodDef yajl_methods[] = {
    {"dumps", (PyCFunctionWithKeywords)(py_dumps), METH_VARARGS | METH_KEYWORDS,
"yajl.dumps(obj [, indent=None])\n\n\
Returns an encoded JSON string of the specified `obj`\n\
\n\
If `indent` is a non-negative integer, then JSON array elements \n\
and object members will be pretty-printed with that indent level. \n\
An indent level of 0 will only insert newlines. None (the default) \n\
selects the most compact representation.\n\
"},
    {"loads", (PyCFunction)(py_loads), METH_VARARGS,
"yajl.loads(string)\n\n\
Returns a decoded object based on the given JSON `string`"},
    {"load", (PyCFunction)(py_load), METH_VARARGS,
"yajl.load(fp)\n\n\
Returns a decoded object based on the JSON read from the `fp` stream-like\n\
object; *Note:* It is expected that `fp` supports the `read()` method"},
    {"dump", (PyCFunctionWithKeywords)(py_dump), METH_VARARGS | METH_KEYWORDS,
"yajl.dump(obj, fp [, indent=None])\n\n\
Encodes the given `obj` and writes it to the `fp` stream-like object. \n\
*Note*: It is expected that `fp` supports the `write()` method\n\
\n\
If `indent` is a non-negative integer, then JSON array elements \n\
and object members will be pretty-printed with that indent level. \n\
An indent level of 0 will only insert newlines. None (the default) \n\
selects the most compact representation.\n\
"},
    /*
     {"iterload", (PyCFunction)(py_iterload), METH_VARARGS, NULL},
     */
    {"monkeypatch", (PyCFunction)(py_monkeypatch), METH_NOARGS,
"yajl.monkeypatch()\n\n\
Monkey-patches the yajl module into sys.modules as \"json\"\n\
"},
    {NULL}
};


#ifdef IS_PYTHON3
static struct PyModuleDef yajlmodule = {
    PyModuleDef_HEAD_INIT,
    "yajl",
#else
PyMODINIT_FUNC inityajl(void)
{

    PyObject *module = Py_InitModule3("yajl", yajl_methods,
#endif
"Providing a pythonic interface to the yajl (Yet Another JSON Library) parser\n\n\
The interface is similar to that of simplejson or jsonlib providing a consistent syntax for JSON\n\
encoding and decoding. Unlike simplejson or jsonlib, yajl is **fast** :)\n\n\
The following benchmark was done on a dual core MacBook Pro with a fairly large (100K) JSON document:\n\
json.loads():\t\t21351.313ms\n\
simplejson.loads():\t1378.6492ms\n\
yajl.loads():\t\t502.4572ms\n\
\n\
json.dumps():\t\t7760.6348ms\n\
simplejson.dumps():\t930.9748ms\n\
yajl.dumps():\t\t681.0221ms"
#ifdef IS_PYTHON3
    , -1, yajl_methods, NULL, NULL, NULL, NULL
};

PyMODINIT_FUNC PyInit_yajl(void)
{
    PyObject *module = PyModule_Create(&yajlmodule);
#else
);
#endif

    PyObject *version = PyUnicode_FromString(MOD_VERSION);
    PyModule_AddObject(module, "__version__", version);

    YajlDecoderType.tp_new = PyType_GenericNew;
    if (PyType_Ready(&YajlDecoderType) < 0) {
        goto bad_exit;
    }

    Py_INCREF(&YajlDecoderType);
    PyModule_AddObject(module, "Decoder", (PyObject *)(&YajlDecoderType));

    YajlEncoderType.tp_new = PyType_GenericNew;
    if (PyType_Ready(&YajlEncoderType) < 0) {
        goto bad_exit;
    }

    Py_INCREF(&YajlEncoderType);
    PyModule_AddObject(module, "Encoder", (PyObject *)(&YajlEncoderType));

#ifdef IS_PYTHON3
    return module;
#endif

bad_exit:
#ifdef IS_PYTHON3
    return NULL;
#else
    return;
#endif
}