cpython/Modules/_bisectmodule.c

/* Bisection algorithms. Drop in replacement for bisect.py

Converted to C by Dmitry Vasiliev (dima at hlabs.spb.ru).
*/

#ifndef Py_BUILD_CORE_BUILTIN
#define Py_BUILD_CORE_MODULE …
#endif

#include "Python.h"
#include "pycore_call.h"          // _PyObject_CallMethod()

/*[clinic input]
module _bisect
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=4d56a2b2033b462b]*/

#include "clinic/_bisectmodule.c.h"

bisect_state;

static inline bisect_state*
get_bisect_state(PyObject *module)
{ … }

static ssizeargfunc
get_sq_item(PyObject *s)
{ … }

static inline Py_ssize_t
internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi,
                      PyObject* key)
{ … }

/*[clinic input]
_bisect.bisect_right -> Py_ssize_t

    a: object
    x: object
    lo: Py_ssize_t = 0
    hi: Py_ssize_t(c_default='-1', accept={int, NoneType}) = None
    *
    key: object = None

Return the index where to insert item x in list a, assuming a is sorted.

The return value i is such that all e in a[:i] have e <= x, and all e in
a[i:] have e > x.  So if x already appears in the list, a.insert(i, x) will
insert just after the rightmost x already there.

Optional args lo (default 0) and hi (default len(a)) bound the
slice of a to be searched.

A custom key function can be supplied to customize the sort order.
[clinic start generated code]*/

static Py_ssize_t
_bisect_bisect_right_impl(PyObject *module, PyObject *a, PyObject *x,
                          Py_ssize_t lo, Py_ssize_t hi, PyObject *key)
/*[clinic end generated code: output=3a4bc09cc7c8a73d input=43071869772dd53a]*/
{ … }

/*[clinic input]
_bisect.insort_right

    a: object
    x: object
    lo: Py_ssize_t = 0
    hi: Py_ssize_t(c_default='-1', accept={int, NoneType}) = None
    *
    key: object = None

Insert item x in list a, and keep it sorted assuming a is sorted.

If x is already in a, insert it to the right of the rightmost x.

Optional args lo (default 0) and hi (default len(a)) bound the
slice of a to be searched.

A custom key function can be supplied to customize the sort order.
[clinic start generated code]*/

static PyObject *
_bisect_insort_right_impl(PyObject *module, PyObject *a, PyObject *x,
                          Py_ssize_t lo, Py_ssize_t hi, PyObject *key)
/*[clinic end generated code: output=ac3bf26d07aedda2 input=f60777d2b6ddb239]*/
{ … }

static inline Py_ssize_t
internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi,
                     PyObject *key)
{ … }


/*[clinic input]
_bisect.bisect_left -> Py_ssize_t

    a: object
    x: object
    lo: Py_ssize_t = 0
    hi: Py_ssize_t(c_default='-1', accept={int, NoneType}) = None
    *
    key: object = None

Return the index where to insert item x in list a, assuming a is sorted.

The return value i is such that all e in a[:i] have e < x, and all e in
a[i:] have e >= x.  So if x already appears in the list, a.insert(i, x) will
insert just before the leftmost x already there.

Optional args lo (default 0) and hi (default len(a)) bound the
slice of a to be searched.

A custom key function can be supplied to customize the sort order.
[clinic start generated code]*/

static Py_ssize_t
_bisect_bisect_left_impl(PyObject *module, PyObject *a, PyObject *x,
                         Py_ssize_t lo, Py_ssize_t hi, PyObject *key)
/*[clinic end generated code: output=70749d6e5cae9284 input=f29c4fe7f9b797c7]*/
{ … }


/*[clinic input]
_bisect.insort_left

    a: object
    x: object
    lo: Py_ssize_t = 0
    hi: Py_ssize_t(c_default='-1', accept={int, NoneType}) = None
    *
    key: object = None

Insert item x in list a, and keep it sorted assuming a is sorted.

If x is already in a, insert it to the left of the leftmost x.

Optional args lo (default 0) and hi (default len(a)) bound the
slice of a to be searched.

A custom key function can be supplied to customize the sort order.
[clinic start generated code]*/

static PyObject *
_bisect_insort_left_impl(PyObject *module, PyObject *a, PyObject *x,
                         Py_ssize_t lo, Py_ssize_t hi, PyObject *key)
/*[clinic end generated code: output=b1d33e5e7ffff11e input=0a700a82edbd472c]*/
{ … }

static PyMethodDef bisect_methods[] = …;

PyDoc_STRVAR(module_doc,
"Bisection algorithms.\n\
\n\
This module provides support for maintaining a list in sorted order without\n\
having to sort the list after each insertion. For long lists of items with\n\
expensive comparison operations, this can be an improvement over the more\n\
common approach.\n");

static int
bisect_clear(PyObject *module)
{ … }

static void
bisect_free(void *module)
{ … }

static int
bisect_modexec(PyObject *m)
{ … }

static PyModuleDef_Slot bisect_slots[] = …;

static struct PyModuleDef _bisectmodule = …;

PyMODINIT_FUNC
PyInit__bisect(void)
{ … }