FastaBuffViews.h

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#ifndef FASTABUFF_VIEW_H
#define FASTABUFF_VIEW_H
 
#include "FastaBuff.h"
#include <Python.h>
#include <stddef.h>
#include <stdint.h>
 
typedef struct {
    PyObject_HEAD FastaBuff *buff;
    int64_t pos;
    size_t len;
    int64_t step;
} FastaBuff_iterator;
 
extern PyTypeObject FastaBuff_iteratorType;
 
void FastaBuff_iterator_initialise(FastaBuff_iterator *iter, FastaBuff *buff,
                                   bool reverse);
 
typedef struct {
    PyObject_HEAD FastaBuff *buff;
    uint64_t start;
    int64_t stop;
    int64_t step;
    size_t slicelength;
} FastaBuff_view;
 
extern PyTypeObject FastaBuff_viewType;
 
PyObject *FastaBuff_view_initialise(FastaBuff_view *view, FastaBuff *buff,
                                    Py_ssize_t start, Py_ssize_t stop,
                                    Py_ssize_t step, Py_ssize_t slicelength);
 
#define FOREACH_VIEW_ELEMENT(self, idx)                                        \
    for (int64_t idx = self->start; idx < self->stop; idx += self->step)
 
#define VIEW_INDEX_TRANSFORM(i, self) ((i * self->step) + self->start)
 
#endif