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#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "structmember.h"
#define RTF_TOKENIZER_REWIND_SIZE 8
typedef struct
{
PyObject_HEAD
char *text;
char *text_ptr;
size_t lnum;
size_t cnum;
size_t lnum_next;
size_t cnum_next;
PyObject **rewind_buffer;
unsigned rewind_count;
unsigned rewind_size;
} RtfTokenizer;
static int RtfTokenizer_init(RtfTokenizer *self, PyObject *args, PyObject *kwargs)
{
const char *text;
Py_ssize_t text_size;
if (!PyArg_ParseTuple(args, "s", &text))
goto error_0;
text_size = strlen(text);
self->text = PyMem_Malloc(text_size + 1);
if (self->text == NULL)
goto error_1;
self->text_ptr = memcpy(self->text, text, text_size);
self->text[text_size] = '\0';
self->rewind_size = RTF_TOKENIZER_REWIND_SIZE;
self->rewind_buffer = PyMem_Malloc(self->rewind_size * sizeof (*self->rewind_buffer));
if (self->rewind_buffer == NULL)
goto error_1;
return 0;
error_1:
PyErr_NoMemory();
error_0:
return -1;
}
static void RtfTokenizer_dealloc(RtfTokenizer *self)
{
while (self->rewind_count)
Py_DECREF(self->rewind_buffer[--self->rewind_count]);
PyMem_Free(self->rewind_buffer);
PyMem_Free(self->text);
}
static PyObject *RtfTokenizer_next_token(RtfTokenizer *self, PyObject *Py_UNUSED(ignored))
{
const char *token_next;
const char *token_start;
size_t token_len;
int linc, cinc;
char c;
if (self->rewind_count)
return self->rewind_buffer[--self->rewind_count];
self->lnum = self->lnum_next;
self->cnum = self->cnum_next;
token_start = token_next = self->text_ptr;
token_len = 0;
linc = cinc = 0;
while ((c = *token_start) != '\0')
{
switch (c)
{
case '\n':
++self->lnum;
self->cnum = 0;
case '\r':
token_start = ++token_next;
continue;
case '{':
case '}':
token_len = 1;
++token_next;
break;
case '\\':
while ((((c = *++token_next) >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')))
;
if (token_start[1] == '\n') {
linc = +1;
cinc = -2 - self->cnum;
}
token_len = token_next - token_start;
if (token_len == 1) {
if (c != '\0') {
++token_next;
++token_len;
}
break;
}
if (c == '-' || (c >= '0' && c <= '9'))
while ((c = *++token_next) >= '0' && c <= '9')
;
token_len = token_next - token_start;
if (c == ' ')
++token_next;
break;
default:
while ((c = *++token_next) != '\0' && c != '\\' &&
c != '{' && c != '}' && c != '\r' && c != '\n')
;
token_len = token_next - token_start;
break;
}
break;
}
self->text_ptr = (char *)token_next;
self->lnum_next = self->lnum + linc;
self->cnum_next = self->cnum + cinc + token_next - token_start;
if (token_len == 0)
Py_RETURN_NONE;
return PyUnicode_FromStringAndSize(token_start, token_len);
}
static PyObject *RtfTokenizer_rewind_token(RtfTokenizer *self, PyObject *token)
{
if (token != Py_None && !PyUnicode_Check(token))
{
PyErr_SetString(PyExc_TypeError, "expected a string");
return NULL;
}
if (self->rewind_count == self->rewind_size)
{
PyObject **new_rewind_buffer;
unsigned new_rewind_size;
new_rewind_size = self->rewind_size + RTF_TOKENIZER_REWIND_SIZE;
new_rewind_buffer = PyMem_Realloc(self->rewind_buffer, new_rewind_size * sizeof (*self->rewind_buffer));
if (NULL == new_rewind_buffer)
{
PyErr_NoMemory();
return NULL;
}
self->rewind_size = new_rewind_size;
self->rewind_buffer = new_rewind_buffer;
}
self->rewind_buffer[self->rewind_count++] = token;
Py_INCREF(token);
Py_RETURN_NONE;
}
static PyMemberDef RtfTokenizer_members[] =
{
{"lnum", T_ULONG, offsetof(RtfTokenizer, lnum), 0, "Line number."},
{"cnum", T_ULONG, offsetof(RtfTokenizer, cnum), 0, "Column number."},
{NULL}
};
static PyMethodDef RtfTokenizer_methods[] =
{
{"next_token", (PyCFunction)RtfTokenizer_next_token, METH_NOARGS, "Return the next token."},
{"rewind_token", (PyCFunction)RtfTokenizer_rewind_token, METH_O, "Rewind token so it's returned next."},
{NULL}
};
static PyTypeObject RtfTokenizerType =
{
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "rtf_tokenize.RtfTokenizer",
.tp_doc = "RTF Tokenizer.",
.tp_basicsize = sizeof (RtfTokenizer),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_new = PyType_GenericNew,
.tp_init = (initproc)RtfTokenizer_init,
.tp_dealloc = (destructor)RtfTokenizer_dealloc,
.tp_members = RtfTokenizer_members,
.tp_methods = RtfTokenizer_methods,
};
static struct PyModuleDef module =
{
PyModuleDef_HEAD_INIT,
.m_name = "rtf_tokenize",
.m_size = -1,
};
PyMODINIT_FUNC PyInit_rtf_tokenize(void)
{
PyObject *m;
if (PyType_Ready(&RtfTokenizerType) < 0)
return NULL;
m = PyModule_Create(&module);
if (m == NULL)
return NULL;
Py_INCREF(&RtfTokenizerType);
if (PyModule_AddObject(m, "RtfTokenizer", (PyObject *)&RtfTokenizerType) < 0)
{
Py_DECREF(&RtfTokenizerType);
Py_DECREF(m);
return NULL;
}
return m;
}
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