1707 lines
51 KiB
C
1707 lines
51 KiB
C
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#include "Python.h"
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#include "structmember.h"
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/* collections module implementation of a deque() datatype
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Written and maintained by Raymond D. Hettinger <python@rcn.com>
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Copyright (c) 2004 Python Software Foundation.
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All rights reserved.
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*/
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/* The block length may be set to any number over 1. Larger numbers
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* reduce the number of calls to the memory allocator, give faster
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* indexing and rotation, and reduce the link::data overhead ratio.
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*
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* Ideally, the block length will be set to two less than some
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* multiple of the cache-line length (so that the full block
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* including the leftlink and rightlink will fit neatly into
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* cache lines).
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*/
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#define BLOCKLEN 62
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#define CENTER ((BLOCKLEN - 1) / 2)
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/* A `dequeobject` is composed of a doubly-linked list of `block` nodes.
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* This list is not circular (the leftmost block has leftlink==NULL,
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* and the rightmost block has rightlink==NULL). A deque d's first
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* element is at d.leftblock[leftindex] and its last element is at
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* d.rightblock[rightindex]; note that, unlike as for Python slice
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* indices, these indices are inclusive on both ends. By being inclusive
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* on both ends, algorithms for left and right operations become
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* symmetrical which simplifies the design.
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*
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* The list of blocks is never empty, so d.leftblock and d.rightblock
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* are never equal to NULL.
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*
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* The indices, d.leftindex and d.rightindex are always in the range
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* 0 <= index < BLOCKLEN.
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* Their exact relationship is:
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* (d.leftindex + d.len - 1) % BLOCKLEN == d.rightindex.
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*
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* Empty deques have d.len == 0; d.leftblock==d.rightblock;
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* d.leftindex == CENTER+1; and d.rightindex == CENTER.
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* Checking for d.len == 0 is the intended way to see whether d is empty.
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*
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* Whenever d.leftblock == d.rightblock,
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* d.leftindex + d.len - 1 == d.rightindex.
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*
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* However, when d.leftblock != d.rightblock, d.leftindex and d.rightindex
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* become indices into distinct blocks and either may be larger than the
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* other.
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*/
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typedef struct BLOCK {
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PyObject *data[BLOCKLEN];
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struct BLOCK *rightlink;
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struct BLOCK *leftlink;
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} block;
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#define MAXFREEBLOCKS 10
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static Py_ssize_t numfreeblocks = 0;
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static block *freeblocks[MAXFREEBLOCKS];
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static block *
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newblock(block *leftlink, block *rightlink, Py_ssize_t len) {
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block *b;
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/* To prevent len from overflowing PY_SSIZE_T_MAX on 32-bit machines, we
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* refuse to allocate new blocks if the current len is nearing overflow. */
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if (len >= PY_SSIZE_T_MAX - 2*BLOCKLEN) {
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PyErr_SetString(PyExc_OverflowError,
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"cannot add more blocks to the deque");
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return NULL;
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}
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if (numfreeblocks) {
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numfreeblocks -= 1;
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b = freeblocks[numfreeblocks];
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} else {
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b = PyMem_Malloc(sizeof(block));
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if (b == NULL) {
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PyErr_NoMemory();
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return NULL;
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}
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}
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b->leftlink = leftlink;
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b->rightlink = rightlink;
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return b;
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}
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static void
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freeblock(block *b)
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{
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if (numfreeblocks < MAXFREEBLOCKS) {
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freeblocks[numfreeblocks] = b;
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numfreeblocks++;
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} else {
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PyMem_Free(b);
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}
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}
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typedef struct {
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PyObject_HEAD
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block *leftblock;
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block *rightblock;
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Py_ssize_t leftindex; /* in range(BLOCKLEN) */
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Py_ssize_t rightindex; /* in range(BLOCKLEN) */
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Py_ssize_t len;
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long state; /* incremented whenever the indices move */
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Py_ssize_t maxlen;
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PyObject *weakreflist; /* List of weak references */
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} dequeobject;
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/* The deque's size limit is d.maxlen. The limit can be zero or positive.
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* If there is no limit, then d.maxlen == -1.
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*
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* After an item is added to a deque, we check to see if the size has grown past
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* the limit. If it has, we get the size back down to the limit by popping an
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* item off of the opposite end. The methods that can trigger this are append(),
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* appendleft(), extend(), and extendleft().
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*/
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#define TRIM(d, popfunction) \
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if (d->maxlen != -1 && d->len > d->maxlen) { \
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PyObject *rv = popfunction(d, NULL); \
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assert(rv != NULL && d->len <= d->maxlen); \
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Py_DECREF(rv); \
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}
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static PyTypeObject deque_type;
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static PyObject *
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deque_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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dequeobject *deque;
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block *b;
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/* create dequeobject structure */
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deque = (dequeobject *)type->tp_alloc(type, 0);
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if (deque == NULL)
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return NULL;
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b = newblock(NULL, NULL, 0);
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if (b == NULL) {
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Py_DECREF(deque);
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return NULL;
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}
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assert(BLOCKLEN >= 2);
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deque->leftblock = b;
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deque->rightblock = b;
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deque->leftindex = CENTER + 1;
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deque->rightindex = CENTER;
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deque->len = 0;
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deque->state = 0;
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deque->weakreflist = NULL;
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deque->maxlen = -1;
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return (PyObject *)deque;
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}
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static PyObject *
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deque_pop(dequeobject *deque, PyObject *unused)
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{
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PyObject *item;
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block *prevblock;
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if (deque->len == 0) {
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PyErr_SetString(PyExc_IndexError, "pop from an empty deque");
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return NULL;
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}
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item = deque->rightblock->data[deque->rightindex];
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deque->rightindex--;
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deque->len--;
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deque->state++;
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if (deque->rightindex == -1) {
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if (deque->len == 0) {
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assert(deque->leftblock == deque->rightblock);
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assert(deque->leftindex == deque->rightindex+1);
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/* re-center instead of freeing a block */
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deque->leftindex = CENTER + 1;
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deque->rightindex = CENTER;
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} else {
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prevblock = deque->rightblock->leftlink;
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assert(deque->leftblock != deque->rightblock);
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freeblock(deque->rightblock);
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prevblock->rightlink = NULL;
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deque->rightblock = prevblock;
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deque->rightindex = BLOCKLEN - 1;
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}
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}
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return item;
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}
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PyDoc_STRVAR(pop_doc, "Remove and return the rightmost element.");
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static PyObject *
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deque_popleft(dequeobject *deque, PyObject *unused)
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{
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PyObject *item;
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block *prevblock;
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if (deque->len == 0) {
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PyErr_SetString(PyExc_IndexError, "pop from an empty deque");
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return NULL;
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}
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assert(deque->leftblock != NULL);
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item = deque->leftblock->data[deque->leftindex];
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deque->leftindex++;
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deque->len--;
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deque->state++;
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if (deque->leftindex == BLOCKLEN) {
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if (deque->len == 0) {
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assert(deque->leftblock == deque->rightblock);
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assert(deque->leftindex == deque->rightindex+1);
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/* re-center instead of freeing a block */
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deque->leftindex = CENTER + 1;
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deque->rightindex = CENTER;
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} else {
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assert(deque->leftblock != deque->rightblock);
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prevblock = deque->leftblock->rightlink;
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freeblock(deque->leftblock);
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assert(prevblock != NULL);
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prevblock->leftlink = NULL;
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deque->leftblock = prevblock;
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deque->leftindex = 0;
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}
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}
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return item;
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}
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PyDoc_STRVAR(popleft_doc, "Remove and return the leftmost element.");
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static PyObject *
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deque_append(dequeobject *deque, PyObject *item)
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{
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deque->state++;
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if (deque->rightindex == BLOCKLEN-1) {
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block *b = newblock(deque->rightblock, NULL, deque->len);
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if (b == NULL)
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return NULL;
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assert(deque->rightblock->rightlink == NULL);
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deque->rightblock->rightlink = b;
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deque->rightblock = b;
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deque->rightindex = -1;
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}
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Py_INCREF(item);
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deque->len++;
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deque->rightindex++;
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deque->rightblock->data[deque->rightindex] = item;
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TRIM(deque, deque_popleft);
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(append_doc, "Add an element to the right side of the deque.");
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static PyObject *
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deque_appendleft(dequeobject *deque, PyObject *item)
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{
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deque->state++;
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if (deque->leftindex == 0) {
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block *b = newblock(NULL, deque->leftblock, deque->len);
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if (b == NULL)
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return NULL;
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assert(deque->leftblock->leftlink == NULL);
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deque->leftblock->leftlink = b;
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deque->leftblock = b;
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deque->leftindex = BLOCKLEN;
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}
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Py_INCREF(item);
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deque->len++;
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deque->leftindex--;
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deque->leftblock->data[deque->leftindex] = item;
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TRIM(deque, deque_pop);
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(appendleft_doc, "Add an element to the left side of the deque.");
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/* Run an iterator to exhaustion. Shortcut for
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the extend/extendleft methods when maxlen == 0. */
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static PyObject*
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consume_iterator(PyObject *it)
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{
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PyObject *item;
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while ((item = PyIter_Next(it)) != NULL) {
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Py_DECREF(item);
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}
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Py_DECREF(it);
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if (PyErr_Occurred())
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return NULL;
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Py_RETURN_NONE;
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}
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static PyObject *
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deque_extend(dequeobject *deque, PyObject *iterable)
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{
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PyObject *it, *item;
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/* Handle case where id(deque) == id(iterable) */
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if ((PyObject *)deque == iterable) {
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PyObject *result;
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PyObject *s = PySequence_List(iterable);
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if (s == NULL)
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return NULL;
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result = deque_extend(deque, s);
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Py_DECREF(s);
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return result;
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}
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it = PyObject_GetIter(iterable);
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if (it == NULL)
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return NULL;
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if (deque->maxlen == 0)
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return consume_iterator(it);
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while ((item = PyIter_Next(it)) != NULL) {
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deque->state++;
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if (deque->rightindex == BLOCKLEN-1) {
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block *b = newblock(deque->rightblock, NULL,
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deque->len);
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if (b == NULL) {
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Py_DECREF(item);
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Py_DECREF(it);
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return NULL;
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}
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assert(deque->rightblock->rightlink == NULL);
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deque->rightblock->rightlink = b;
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deque->rightblock = b;
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deque->rightindex = -1;
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}
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deque->len++;
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deque->rightindex++;
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deque->rightblock->data[deque->rightindex] = item;
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TRIM(deque, deque_popleft);
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}
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Py_DECREF(it);
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if (PyErr_Occurred())
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return NULL;
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(extend_doc,
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"Extend the right side of the deque with elements from the iterable");
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static PyObject *
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deque_extendleft(dequeobject *deque, PyObject *iterable)
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{
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PyObject *it, *item;
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/* Handle case where id(deque) == id(iterable) */
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if ((PyObject *)deque == iterable) {
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PyObject *result;
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PyObject *s = PySequence_List(iterable);
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if (s == NULL)
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return NULL;
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result = deque_extendleft(deque, s);
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Py_DECREF(s);
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return result;
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}
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it = PyObject_GetIter(iterable);
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if (it == NULL)
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return NULL;
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if (deque->maxlen == 0)
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return consume_iterator(it);
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while ((item = PyIter_Next(it)) != NULL) {
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deque->state++;
|
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if (deque->leftindex == 0) {
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block *b = newblock(NULL, deque->leftblock,
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deque->len);
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if (b == NULL) {
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Py_DECREF(item);
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Py_DECREF(it);
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return NULL;
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}
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assert(deque->leftblock->leftlink == NULL);
|
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deque->leftblock->leftlink = b;
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deque->leftblock = b;
|
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deque->leftindex = BLOCKLEN;
|
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}
|
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deque->len++;
|
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deque->leftindex--;
|
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deque->leftblock->data[deque->leftindex] = item;
|
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TRIM(deque, deque_pop);
|
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}
|
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Py_DECREF(it);
|
||
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if (PyErr_Occurred())
|
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return NULL;
|
||
|
Py_RETURN_NONE;
|
||
|
}
|
||
|
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||
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PyDoc_STRVAR(extendleft_doc,
|
||
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"Extend the left side of the deque with elements from the iterable");
|
||
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|
||
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static PyObject *
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deque_inplace_concat(dequeobject *deque, PyObject *other)
|
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{
|
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PyObject *result;
|
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|
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result = deque_extend(deque, other);
|
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if (result == NULL)
|
||
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return result;
|
||
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Py_DECREF(result);
|
||
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Py_INCREF(deque);
|
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return (PyObject *)deque;
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||
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}
|
||
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|
||
|
static int
|
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_deque_rotate(dequeobject *deque, Py_ssize_t n)
|
||
|
{
|
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Py_ssize_t m, len=deque->len, halflen=len>>1;
|
||
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|
||
|
if (len <= 1)
|
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return 0;
|
||
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if (n > halflen || n < -halflen) {
|
||
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n %= len;
|
||
|
if (n > halflen)
|
||
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n -= len;
|
||
|
else if (n < -halflen)
|
||
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n += len;
|
||
|
}
|
||
|
assert(len > 1);
|
||
|
assert(-halflen <= n && n <= halflen);
|
||
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|
||
|
deque->state++;
|
||
|
while (n > 0) {
|
||
|
if (deque->leftindex == 0) {
|
||
|
block *b = newblock(NULL, deque->leftblock, len);
|
||
|
if (b == NULL)
|
||
|
return -1;
|
||
|
assert(deque->leftblock->leftlink == NULL);
|
||
|
deque->leftblock->leftlink = b;
|
||
|
deque->leftblock = b;
|
||
|
deque->leftindex = BLOCKLEN;
|
||
|
}
|
||
|
assert(deque->leftindex > 0);
|
||
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|
||
|
m = n;
|
||
|
if (m > deque->rightindex + 1)
|
||
|
m = deque->rightindex + 1;
|
||
|
if (m > deque->leftindex)
|
||
|
m = deque->leftindex;
|
||
|
assert (m > 0 && m <= len);
|
||
|
memcpy(&deque->leftblock->data[deque->leftindex - m],
|
||
|
&deque->rightblock->data[deque->rightindex + 1 - m],
|
||
|
m * sizeof(PyObject *));
|
||
|
deque->rightindex -= m;
|
||
|
deque->leftindex -= m;
|
||
|
n -= m;
|
||
|
|
||
|
if (deque->rightindex == -1) {
|
||
|
block *prevblock = deque->rightblock->leftlink;
|
||
|
assert(deque->rightblock != NULL);
|
||
|
assert(deque->leftblock != deque->rightblock);
|
||
|
freeblock(deque->rightblock);
|
||
|
prevblock->rightlink = NULL;
|
||
|
deque->rightblock = prevblock;
|
||
|
deque->rightindex = BLOCKLEN - 1;
|
||
|
}
|
||
|
}
|
||
|
while (n < 0) {
|
||
|
if (deque->rightindex == BLOCKLEN - 1) {
|
||
|
block *b = newblock(deque->rightblock, NULL, len);
|
||
|
if (b == NULL)
|
||
|
return -1;
|
||
|
assert(deque->rightblock->rightlink == NULL);
|
||
|
deque->rightblock->rightlink = b;
|
||
|
deque->rightblock = b;
|
||
|
deque->rightindex = -1;
|
||
|
}
|
||
|
assert (deque->rightindex < BLOCKLEN - 1);
|
||
|
|
||
|
m = -n;
|
||
|
if (m > BLOCKLEN - deque->leftindex)
|
||
|
m = BLOCKLEN - deque->leftindex;
|
||
|
if (m > BLOCKLEN - 1 - deque->rightindex)
|
||
|
m = BLOCKLEN - 1 - deque->rightindex;
|
||
|
assert (m > 0 && m <= len);
|
||
|
memcpy(&deque->rightblock->data[deque->rightindex + 1],
|
||
|
&deque->leftblock->data[deque->leftindex],
|
||
|
m * sizeof(PyObject *));
|
||
|
deque->leftindex += m;
|
||
|
deque->rightindex += m;
|
||
|
n += m;
|
||
|
|
||
|
if (deque->leftindex == BLOCKLEN) {
|
||
|
block *nextblock = deque->leftblock->rightlink;
|
||
|
assert(deque->leftblock != deque->rightblock);
|
||
|
freeblock(deque->leftblock);
|
||
|
assert(nextblock != NULL);
|
||
|
nextblock->leftlink = NULL;
|
||
|
deque->leftblock = nextblock;
|
||
|
deque->leftindex = 0;
|
||
|
}
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_rotate(dequeobject *deque, PyObject *args)
|
||
|
{
|
||
|
Py_ssize_t n=1;
|
||
|
|
||
|
if (!PyArg_ParseTuple(args, "|n:rotate", &n))
|
||
|
return NULL;
|
||
|
if (_deque_rotate(deque, n) == 0)
|
||
|
Py_RETURN_NONE;
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(rotate_doc,
|
||
|
"Rotate the deque n steps to the right (default n=1). If n is negative, rotates left.");
|
||
|
|
||
|
static PyObject *
|
||
|
deque_reverse(dequeobject *deque, PyObject *unused)
|
||
|
{
|
||
|
block *leftblock = deque->leftblock;
|
||
|
block *rightblock = deque->rightblock;
|
||
|
Py_ssize_t leftindex = deque->leftindex;
|
||
|
Py_ssize_t rightindex = deque->rightindex;
|
||
|
Py_ssize_t n = (deque->len)/2;
|
||
|
Py_ssize_t i;
|
||
|
PyObject *tmp;
|
||
|
|
||
|
for (i=0 ; i<n ; i++) {
|
||
|
/* Validate that pointers haven't met in the middle */
|
||
|
assert(leftblock != rightblock || leftindex < rightindex);
|
||
|
|
||
|
/* Swap */
|
||
|
tmp = leftblock->data[leftindex];
|
||
|
leftblock->data[leftindex] = rightblock->data[rightindex];
|
||
|
rightblock->data[rightindex] = tmp;
|
||
|
|
||
|
/* Advance left block/index pair */
|
||
|
leftindex++;
|
||
|
if (leftindex == BLOCKLEN) {
|
||
|
if (leftblock->rightlink == NULL)
|
||
|
break;
|
||
|
leftblock = leftblock->rightlink;
|
||
|
leftindex = 0;
|
||
|
}
|
||
|
|
||
|
/* Step backwards with the right block/index pair */
|
||
|
rightindex--;
|
||
|
if (rightindex == -1) {
|
||
|
if (rightblock->leftlink == NULL)
|
||
|
break;
|
||
|
rightblock = rightblock->leftlink;
|
||
|
rightindex = BLOCKLEN - 1;
|
||
|
}
|
||
|
}
|
||
|
Py_RETURN_NONE;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(reverse_doc,
|
||
|
"D.reverse() -- reverse *IN PLACE*");
|
||
|
|
||
|
static PyObject *
|
||
|
deque_count(dequeobject *deque, PyObject *v)
|
||
|
{
|
||
|
block *leftblock = deque->leftblock;
|
||
|
Py_ssize_t leftindex = deque->leftindex;
|
||
|
Py_ssize_t n = deque->len;
|
||
|
Py_ssize_t i;
|
||
|
Py_ssize_t count = 0;
|
||
|
PyObject *item;
|
||
|
long start_state = deque->state;
|
||
|
int cmp;
|
||
|
|
||
|
for (i=0 ; i<n ; i++) {
|
||
|
item = leftblock->data[leftindex];
|
||
|
cmp = PyObject_RichCompareBool(item, v, Py_EQ);
|
||
|
if (cmp > 0)
|
||
|
count++;
|
||
|
else if (cmp < 0)
|
||
|
return NULL;
|
||
|
|
||
|
if (start_state != deque->state) {
|
||
|
PyErr_SetString(PyExc_RuntimeError,
|
||
|
"deque mutated during iteration");
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
/* Advance left block/index pair */
|
||
|
leftindex++;
|
||
|
if (leftindex == BLOCKLEN) {
|
||
|
if (leftblock->rightlink == NULL) /* can occur when i==n-1 */
|
||
|
break;
|
||
|
leftblock = leftblock->rightlink;
|
||
|
leftindex = 0;
|
||
|
}
|
||
|
}
|
||
|
return PyInt_FromSsize_t(count);
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(count_doc,
|
||
|
"D.count(value) -> integer -- return number of occurrences of value");
|
||
|
|
||
|
static Py_ssize_t
|
||
|
deque_len(dequeobject *deque)
|
||
|
{
|
||
|
return deque->len;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_remove(dequeobject *deque, PyObject *value)
|
||
|
{
|
||
|
Py_ssize_t i, n=deque->len;
|
||
|
|
||
|
for (i=0 ; i<n ; i++) {
|
||
|
PyObject *item = deque->leftblock->data[deque->leftindex];
|
||
|
int cmp = PyObject_RichCompareBool(item, value, Py_EQ);
|
||
|
|
||
|
if (deque->len != n) {
|
||
|
PyErr_SetString(PyExc_IndexError,
|
||
|
"deque mutated during remove().");
|
||
|
return NULL;
|
||
|
}
|
||
|
if (cmp > 0) {
|
||
|
PyObject *tgt = deque_popleft(deque, NULL);
|
||
|
assert (tgt != NULL);
|
||
|
Py_DECREF(tgt);
|
||
|
if (_deque_rotate(deque, i) == -1)
|
||
|
return NULL;
|
||
|
Py_RETURN_NONE;
|
||
|
}
|
||
|
else if (cmp < 0) {
|
||
|
_deque_rotate(deque, i);
|
||
|
return NULL;
|
||
|
}
|
||
|
_deque_rotate(deque, -1);
|
||
|
}
|
||
|
PyErr_SetString(PyExc_ValueError, "deque.remove(x): x not in deque");
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(remove_doc,
|
||
|
"D.remove(value) -- remove first occurrence of value.");
|
||
|
|
||
|
static void
|
||
|
deque_clear(dequeobject *deque)
|
||
|
{
|
||
|
PyObject *item;
|
||
|
|
||
|
while (deque->len) {
|
||
|
item = deque_pop(deque, NULL);
|
||
|
assert (item != NULL);
|
||
|
Py_DECREF(item);
|
||
|
}
|
||
|
assert(deque->leftblock == deque->rightblock &&
|
||
|
deque->leftindex - 1 == deque->rightindex &&
|
||
|
deque->len == 0);
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_item(dequeobject *deque, Py_ssize_t i)
|
||
|
{
|
||
|
block *b;
|
||
|
PyObject *item;
|
||
|
Py_ssize_t n, index=i;
|
||
|
|
||
|
if (i < 0 || i >= deque->len) {
|
||
|
PyErr_SetString(PyExc_IndexError,
|
||
|
"deque index out of range");
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
if (i == 0) {
|
||
|
i = deque->leftindex;
|
||
|
b = deque->leftblock;
|
||
|
} else if (i == deque->len - 1) {
|
||
|
i = deque->rightindex;
|
||
|
b = deque->rightblock;
|
||
|
} else {
|
||
|
i += deque->leftindex;
|
||
|
n = i / BLOCKLEN;
|
||
|
i %= BLOCKLEN;
|
||
|
if (index < (deque->len >> 1)) {
|
||
|
b = deque->leftblock;
|
||
|
while (n--)
|
||
|
b = b->rightlink;
|
||
|
} else {
|
||
|
n = (deque->leftindex + deque->len - 1) / BLOCKLEN - n;
|
||
|
b = deque->rightblock;
|
||
|
while (n--)
|
||
|
b = b->leftlink;
|
||
|
}
|
||
|
}
|
||
|
item = b->data[i];
|
||
|
Py_INCREF(item);
|
||
|
return item;
|
||
|
}
|
||
|
|
||
|
/* delitem() implemented in terms of rotate for simplicity and reasonable
|
||
|
performance near the end points. If for some reason this method becomes
|
||
|
popular, it is not hard to re-implement this using direct data movement
|
||
|
(similar to code in list slice assignment) and achieve a two or threefold
|
||
|
performance boost.
|
||
|
*/
|
||
|
|
||
|
static int
|
||
|
deque_del_item(dequeobject *deque, Py_ssize_t i)
|
||
|
{
|
||
|
PyObject *item;
|
||
|
|
||
|
assert (i >= 0 && i < deque->len);
|
||
|
if (_deque_rotate(deque, -i) == -1)
|
||
|
return -1;
|
||
|
|
||
|
item = deque_popleft(deque, NULL);
|
||
|
assert (item != NULL);
|
||
|
Py_DECREF(item);
|
||
|
|
||
|
return _deque_rotate(deque, i);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
deque_ass_item(dequeobject *deque, Py_ssize_t i, PyObject *v)
|
||
|
{
|
||
|
PyObject *old_value;
|
||
|
block *b;
|
||
|
Py_ssize_t n, len=deque->len, halflen=(len+1)>>1, index=i;
|
||
|
|
||
|
if (i < 0 || i >= len) {
|
||
|
PyErr_SetString(PyExc_IndexError,
|
||
|
"deque index out of range");
|
||
|
return -1;
|
||
|
}
|
||
|
if (v == NULL)
|
||
|
return deque_del_item(deque, i);
|
||
|
|
||
|
i += deque->leftindex;
|
||
|
n = i / BLOCKLEN;
|
||
|
i %= BLOCKLEN;
|
||
|
if (index <= halflen) {
|
||
|
b = deque->leftblock;
|
||
|
while (n--)
|
||
|
b = b->rightlink;
|
||
|
} else {
|
||
|
n = (deque->leftindex + len - 1) / BLOCKLEN - n;
|
||
|
b = deque->rightblock;
|
||
|
while (n--)
|
||
|
b = b->leftlink;
|
||
|
}
|
||
|
Py_INCREF(v);
|
||
|
old_value = b->data[i];
|
||
|
b->data[i] = v;
|
||
|
Py_DECREF(old_value);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_clearmethod(dequeobject *deque)
|
||
|
{
|
||
|
deque_clear(deque);
|
||
|
Py_RETURN_NONE;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(clear_doc, "Remove all elements from the deque.");
|
||
|
|
||
|
static void
|
||
|
deque_dealloc(dequeobject *deque)
|
||
|
{
|
||
|
PyObject_GC_UnTrack(deque);
|
||
|
if (deque->weakreflist != NULL)
|
||
|
PyObject_ClearWeakRefs((PyObject *) deque);
|
||
|
if (deque->leftblock != NULL) {
|
||
|
deque_clear(deque);
|
||
|
assert(deque->leftblock != NULL);
|
||
|
freeblock(deque->leftblock);
|
||
|
}
|
||
|
deque->leftblock = NULL;
|
||
|
deque->rightblock = NULL;
|
||
|
Py_TYPE(deque)->tp_free(deque);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
deque_traverse(dequeobject *deque, visitproc visit, void *arg)
|
||
|
{
|
||
|
block *b;
|
||
|
PyObject *item;
|
||
|
Py_ssize_t index;
|
||
|
Py_ssize_t indexlo = deque->leftindex;
|
||
|
|
||
|
for (b = deque->leftblock; b != NULL; b = b->rightlink) {
|
||
|
const Py_ssize_t indexhi = b == deque->rightblock ?
|
||
|
deque->rightindex :
|
||
|
BLOCKLEN - 1;
|
||
|
|
||
|
for (index = indexlo; index <= indexhi; ++index) {
|
||
|
item = b->data[index];
|
||
|
Py_VISIT(item);
|
||
|
}
|
||
|
indexlo = 0;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_copy(PyObject *deque)
|
||
|
{
|
||
|
if (((dequeobject *)deque)->maxlen == -1)
|
||
|
return PyObject_CallFunction((PyObject *)(Py_TYPE(deque)), "O", deque, NULL);
|
||
|
else
|
||
|
return PyObject_CallFunction((PyObject *)(Py_TYPE(deque)), "Oi",
|
||
|
deque, ((dequeobject *)deque)->maxlen, NULL);
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(copy_doc, "Return a shallow copy of a deque.");
|
||
|
|
||
|
static PyObject *
|
||
|
deque_reduce(dequeobject *deque)
|
||
|
{
|
||
|
PyObject *dict, *result, *aslist;
|
||
|
|
||
|
dict = PyObject_GetAttrString((PyObject *)deque, "__dict__");
|
||
|
if (dict == NULL)
|
||
|
PyErr_Clear();
|
||
|
aslist = PySequence_List((PyObject *)deque);
|
||
|
if (aslist == NULL) {
|
||
|
Py_XDECREF(dict);
|
||
|
return NULL;
|
||
|
}
|
||
|
if (dict == NULL) {
|
||
|
if (deque->maxlen == -1)
|
||
|
result = Py_BuildValue("O(O)", Py_TYPE(deque), aslist);
|
||
|
else
|
||
|
result = Py_BuildValue("O(On)", Py_TYPE(deque), aslist, deque->maxlen);
|
||
|
} else {
|
||
|
if (deque->maxlen == -1)
|
||
|
result = Py_BuildValue("O(OO)O", Py_TYPE(deque), aslist, Py_None, dict);
|
||
|
else
|
||
|
result = Py_BuildValue("O(On)O", Py_TYPE(deque), aslist, deque->maxlen, dict);
|
||
|
}
|
||
|
Py_XDECREF(dict);
|
||
|
Py_DECREF(aslist);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
|
||
|
|
||
|
static PyObject *
|
||
|
deque_repr(PyObject *deque)
|
||
|
{
|
||
|
PyObject *aslist, *result, *fmt;
|
||
|
int i;
|
||
|
|
||
|
i = Py_ReprEnter(deque);
|
||
|
if (i != 0) {
|
||
|
if (i < 0)
|
||
|
return NULL;
|
||
|
return PyString_FromString("[...]");
|
||
|
}
|
||
|
|
||
|
aslist = PySequence_List(deque);
|
||
|
if (aslist == NULL) {
|
||
|
Py_ReprLeave(deque);
|
||
|
return NULL;
|
||
|
}
|
||
|
if (((dequeobject *)deque)->maxlen != -1)
|
||
|
fmt = PyString_FromFormat("deque(%%r, maxlen=%zd)",
|
||
|
((dequeobject *)deque)->maxlen);
|
||
|
else
|
||
|
fmt = PyString_FromString("deque(%r)");
|
||
|
if (fmt == NULL) {
|
||
|
Py_DECREF(aslist);
|
||
|
Py_ReprLeave(deque);
|
||
|
return NULL;
|
||
|
}
|
||
|
result = PyString_Format(fmt, aslist);
|
||
|
Py_DECREF(fmt);
|
||
|
Py_DECREF(aslist);
|
||
|
Py_ReprLeave(deque);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
deque_tp_print(PyObject *deque, FILE *fp, int flags)
|
||
|
{
|
||
|
PyObject *it, *item;
|
||
|
char *emit = ""; /* No separator emitted on first pass */
|
||
|
char *separator = ", ";
|
||
|
int i;
|
||
|
|
||
|
i = Py_ReprEnter(deque);
|
||
|
if (i != 0) {
|
||
|
if (i < 0)
|
||
|
return i;
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fputs("[...]", fp);
|
||
|
Py_END_ALLOW_THREADS
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
it = PyObject_GetIter(deque);
|
||
|
if (it == NULL)
|
||
|
return -1;
|
||
|
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fputs("deque([", fp);
|
||
|
Py_END_ALLOW_THREADS
|
||
|
while ((item = PyIter_Next(it)) != NULL) {
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fputs(emit, fp);
|
||
|
Py_END_ALLOW_THREADS
|
||
|
emit = separator;
|
||
|
if (PyObject_Print(item, fp, 0) != 0) {
|
||
|
Py_DECREF(item);
|
||
|
Py_DECREF(it);
|
||
|
Py_ReprLeave(deque);
|
||
|
return -1;
|
||
|
}
|
||
|
Py_DECREF(item);
|
||
|
}
|
||
|
Py_ReprLeave(deque);
|
||
|
Py_DECREF(it);
|
||
|
if (PyErr_Occurred())
|
||
|
return -1;
|
||
|
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
if (((dequeobject *)deque)->maxlen == -1)
|
||
|
fputs("])", fp);
|
||
|
else
|
||
|
fprintf(fp, "], maxlen=%" PY_FORMAT_SIZE_T "d)", ((dequeobject *)deque)->maxlen);
|
||
|
Py_END_ALLOW_THREADS
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_richcompare(PyObject *v, PyObject *w, int op)
|
||
|
{
|
||
|
PyObject *it1=NULL, *it2=NULL, *x, *y;
|
||
|
Py_ssize_t vs, ws;
|
||
|
int b, cmp=-1;
|
||
|
|
||
|
if (!PyObject_TypeCheck(v, &deque_type) ||
|
||
|
!PyObject_TypeCheck(w, &deque_type)) {
|
||
|
Py_INCREF(Py_NotImplemented);
|
||
|
return Py_NotImplemented;
|
||
|
}
|
||
|
|
||
|
/* Shortcuts */
|
||
|
vs = ((dequeobject *)v)->len;
|
||
|
ws = ((dequeobject *)w)->len;
|
||
|
if (op == Py_EQ) {
|
||
|
if (v == w)
|
||
|
Py_RETURN_TRUE;
|
||
|
if (vs != ws)
|
||
|
Py_RETURN_FALSE;
|
||
|
}
|
||
|
if (op == Py_NE) {
|
||
|
if (v == w)
|
||
|
Py_RETURN_FALSE;
|
||
|
if (vs != ws)
|
||
|
Py_RETURN_TRUE;
|
||
|
}
|
||
|
|
||
|
/* Search for the first index where items are different */
|
||
|
it1 = PyObject_GetIter(v);
|
||
|
if (it1 == NULL)
|
||
|
goto done;
|
||
|
it2 = PyObject_GetIter(w);
|
||
|
if (it2 == NULL)
|
||
|
goto done;
|
||
|
for (;;) {
|
||
|
x = PyIter_Next(it1);
|
||
|
if (x == NULL && PyErr_Occurred())
|
||
|
goto done;
|
||
|
y = PyIter_Next(it2);
|
||
|
if (x == NULL || y == NULL)
|
||
|
break;
|
||
|
b = PyObject_RichCompareBool(x, y, Py_EQ);
|
||
|
if (b == 0) {
|
||
|
cmp = PyObject_RichCompareBool(x, y, op);
|
||
|
Py_DECREF(x);
|
||
|
Py_DECREF(y);
|
||
|
goto done;
|
||
|
}
|
||
|
Py_DECREF(x);
|
||
|
Py_DECREF(y);
|
||
|
if (b == -1)
|
||
|
goto done;
|
||
|
}
|
||
|
/* We reached the end of one deque or both */
|
||
|
Py_XDECREF(x);
|
||
|
Py_XDECREF(y);
|
||
|
if (PyErr_Occurred())
|
||
|
goto done;
|
||
|
switch (op) {
|
||
|
case Py_LT: cmp = y != NULL; break; /* if w was longer */
|
||
|
case Py_LE: cmp = x == NULL; break; /* if v was not longer */
|
||
|
case Py_EQ: cmp = x == y; break; /* if we reached the end of both */
|
||
|
case Py_NE: cmp = x != y; break; /* if one deque continues */
|
||
|
case Py_GT: cmp = x != NULL; break; /* if v was longer */
|
||
|
case Py_GE: cmp = y == NULL; break; /* if w was not longer */
|
||
|
}
|
||
|
|
||
|
done:
|
||
|
Py_XDECREF(it1);
|
||
|
Py_XDECREF(it2);
|
||
|
if (cmp == 1)
|
||
|
Py_RETURN_TRUE;
|
||
|
if (cmp == 0)
|
||
|
Py_RETURN_FALSE;
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
deque_init(dequeobject *deque, PyObject *args, PyObject *kwdargs)
|
||
|
{
|
||
|
PyObject *iterable = NULL;
|
||
|
PyObject *maxlenobj = NULL;
|
||
|
Py_ssize_t maxlen = -1;
|
||
|
char *kwlist[] = {"iterable", "maxlen", 0};
|
||
|
|
||
|
if (!PyArg_ParseTupleAndKeywords(args, kwdargs, "|OO:deque", kwlist, &iterable, &maxlenobj))
|
||
|
return -1;
|
||
|
if (maxlenobj != NULL && maxlenobj != Py_None) {
|
||
|
maxlen = PyInt_AsSsize_t(maxlenobj);
|
||
|
if (maxlen == -1 && PyErr_Occurred())
|
||
|
return -1;
|
||
|
if (maxlen < 0) {
|
||
|
PyErr_SetString(PyExc_ValueError, "maxlen must be non-negative");
|
||
|
return -1;
|
||
|
}
|
||
|
}
|
||
|
deque->maxlen = maxlen;
|
||
|
deque_clear(deque);
|
||
|
if (iterable != NULL) {
|
||
|
PyObject *rv = deque_extend(deque, iterable);
|
||
|
if (rv == NULL)
|
||
|
return -1;
|
||
|
Py_DECREF(rv);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
deque_sizeof(dequeobject *deque, void *unused)
|
||
|
{
|
||
|
Py_ssize_t res;
|
||
|
Py_ssize_t blocks;
|
||
|
|
||
|
res = sizeof(dequeobject);
|
||
|
blocks = (deque->leftindex + deque->len + BLOCKLEN - 1) / BLOCKLEN;
|
||
|
assert(deque->leftindex + deque->len - 1 ==
|
||
|
(blocks - 1) * BLOCKLEN + deque->rightindex);
|
||
|
res += blocks * sizeof(block);
|
||
|
return PyLong_FromSsize_t(res);
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(sizeof_doc,
|
||
|
"D.__sizeof__() -- size of D in memory, in bytes");
|
||
|
|
||
|
static PyObject *
|
||
|
deque_get_maxlen(dequeobject *deque)
|
||
|
{
|
||
|
if (deque->maxlen == -1)
|
||
|
Py_RETURN_NONE;
|
||
|
return PyInt_FromSsize_t(deque->maxlen);
|
||
|
}
|
||
|
|
||
|
static PyGetSetDef deque_getset[] = {
|
||
|
{"maxlen", (getter)deque_get_maxlen, (setter)NULL,
|
||
|
"maximum size of a deque or None if unbounded"},
|
||
|
{0}
|
||
|
};
|
||
|
|
||
|
static PySequenceMethods deque_as_sequence = {
|
||
|
(lenfunc)deque_len, /* sq_length */
|
||
|
0, /* sq_concat */
|
||
|
0, /* sq_repeat */
|
||
|
(ssizeargfunc)deque_item, /* sq_item */
|
||
|
0, /* sq_slice */
|
||
|
(ssizeobjargproc)deque_ass_item, /* sq_ass_item */
|
||
|
0, /* sq_ass_slice */
|
||
|
0, /* sq_contains */
|
||
|
(binaryfunc)deque_inplace_concat, /* sq_inplace_concat */
|
||
|
0, /* sq_inplace_repeat */
|
||
|
|
||
|
};
|
||
|
|
||
|
/* deque object ********************************************************/
|
||
|
|
||
|
static PyObject *deque_iter(dequeobject *deque);
|
||
|
static PyObject *deque_reviter(dequeobject *deque);
|
||
|
PyDoc_STRVAR(reversed_doc,
|
||
|
"D.__reversed__() -- return a reverse iterator over the deque");
|
||
|
|
||
|
static PyMethodDef deque_methods[] = {
|
||
|
{"append", (PyCFunction)deque_append,
|
||
|
METH_O, append_doc},
|
||
|
{"appendleft", (PyCFunction)deque_appendleft,
|
||
|
METH_O, appendleft_doc},
|
||
|
{"clear", (PyCFunction)deque_clearmethod,
|
||
|
METH_NOARGS, clear_doc},
|
||
|
{"__copy__", (PyCFunction)deque_copy,
|
||
|
METH_NOARGS, copy_doc},
|
||
|
{"count", (PyCFunction)deque_count,
|
||
|
METH_O, count_doc},
|
||
|
{"extend", (PyCFunction)deque_extend,
|
||
|
METH_O, extend_doc},
|
||
|
{"extendleft", (PyCFunction)deque_extendleft,
|
||
|
METH_O, extendleft_doc},
|
||
|
{"pop", (PyCFunction)deque_pop,
|
||
|
METH_NOARGS, pop_doc},
|
||
|
{"popleft", (PyCFunction)deque_popleft,
|
||
|
METH_NOARGS, popleft_doc},
|
||
|
{"__reduce__", (PyCFunction)deque_reduce,
|
||
|
METH_NOARGS, reduce_doc},
|
||
|
{"remove", (PyCFunction)deque_remove,
|
||
|
METH_O, remove_doc},
|
||
|
{"__reversed__", (PyCFunction)deque_reviter,
|
||
|
METH_NOARGS, reversed_doc},
|
||
|
{"reverse", (PyCFunction)deque_reverse,
|
||
|
METH_NOARGS, reverse_doc},
|
||
|
{"rotate", (PyCFunction)deque_rotate,
|
||
|
METH_VARARGS, rotate_doc},
|
||
|
{"__sizeof__", (PyCFunction)deque_sizeof,
|
||
|
METH_NOARGS, sizeof_doc},
|
||
|
{NULL, NULL} /* sentinel */
|
||
|
};
|
||
|
|
||
|
PyDoc_STRVAR(deque_doc,
|
||
|
"deque([iterable[, maxlen]]) --> deque object\n\
|
||
|
\n\
|
||
|
Build an ordered collection with optimized access from its endpoints.");
|
||
|
|
||
|
static PyTypeObject deque_type = {
|
||
|
PyVarObject_HEAD_INIT(NULL, 0)
|
||
|
"collections.deque", /* tp_name */
|
||
|
sizeof(dequeobject), /* tp_basicsize */
|
||
|
0, /* tp_itemsize */
|
||
|
/* methods */
|
||
|
(destructor)deque_dealloc, /* tp_dealloc */
|
||
|
deque_tp_print, /* tp_print */
|
||
|
0, /* tp_getattr */
|
||
|
0, /* tp_setattr */
|
||
|
0, /* tp_compare */
|
||
|
deque_repr, /* tp_repr */
|
||
|
0, /* tp_as_number */
|
||
|
&deque_as_sequence, /* tp_as_sequence */
|
||
|
0, /* tp_as_mapping */
|
||
|
(hashfunc)PyObject_HashNotImplemented, /* tp_hash */
|
||
|
0, /* tp_call */
|
||
|
0, /* tp_str */
|
||
|
PyObject_GenericGetAttr, /* tp_getattro */
|
||
|
0, /* tp_setattro */
|
||
|
0, /* tp_as_buffer */
|
||
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |
|
||
|
Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */
|
||
|
deque_doc, /* tp_doc */
|
||
|
(traverseproc)deque_traverse, /* tp_traverse */
|
||
|
(inquiry)deque_clear, /* tp_clear */
|
||
|
(richcmpfunc)deque_richcompare, /* tp_richcompare */
|
||
|
offsetof(dequeobject, weakreflist), /* tp_weaklistoffset*/
|
||
|
(getiterfunc)deque_iter, /* tp_iter */
|
||
|
0, /* tp_iternext */
|
||
|
deque_methods, /* tp_methods */
|
||
|
0, /* tp_members */
|
||
|
deque_getset, /* tp_getset */
|
||
|
0, /* tp_base */
|
||
|
0, /* tp_dict */
|
||
|
0, /* tp_descr_get */
|
||
|
0, /* tp_descr_set */
|
||
|
0, /* tp_dictoffset */
|
||
|
(initproc)deque_init, /* tp_init */
|
||
|
PyType_GenericAlloc, /* tp_alloc */
|
||
|
deque_new, /* tp_new */
|
||
|
PyObject_GC_Del, /* tp_free */
|
||
|
};
|
||
|
|
||
|
/*********************** Deque Iterator **************************/
|
||
|
|
||
|
typedef struct {
|
||
|
PyObject_HEAD
|
||
|
Py_ssize_t index;
|
||
|
block *b;
|
||
|
dequeobject *deque;
|
||
|
long state; /* state when the iterator is created */
|
||
|
Py_ssize_t counter; /* number of items remaining for iteration */
|
||
|
} dequeiterobject;
|
||
|
|
||
|
static PyTypeObject dequeiter_type;
|
||
|
|
||
|
static PyObject *
|
||
|
deque_iter(dequeobject *deque)
|
||
|
{
|
||
|
dequeiterobject *it;
|
||
|
|
||
|
it = PyObject_GC_New(dequeiterobject, &dequeiter_type);
|
||
|
if (it == NULL)
|
||
|
return NULL;
|
||
|
it->b = deque->leftblock;
|
||
|
it->index = deque->leftindex;
|
||
|
Py_INCREF(deque);
|
||
|
it->deque = deque;
|
||
|
it->state = deque->state;
|
||
|
it->counter = deque->len;
|
||
|
PyObject_GC_Track(it);
|
||
|
return (PyObject *)it;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
dequeiter_traverse(dequeiterobject *dio, visitproc visit, void *arg)
|
||
|
{
|
||
|
Py_VISIT(dio->deque);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
dequeiter_dealloc(dequeiterobject *dio)
|
||
|
{
|
||
|
Py_XDECREF(dio->deque);
|
||
|
PyObject_GC_Del(dio);
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
dequeiter_next(dequeiterobject *it)
|
||
|
{
|
||
|
PyObject *item;
|
||
|
|
||
|
if (it->deque->state != it->state) {
|
||
|
it->counter = 0;
|
||
|
PyErr_SetString(PyExc_RuntimeError,
|
||
|
"deque mutated during iteration");
|
||
|
return NULL;
|
||
|
}
|
||
|
if (it->counter == 0)
|
||
|
return NULL;
|
||
|
assert (!(it->b == it->deque->rightblock &&
|
||
|
it->index > it->deque->rightindex));
|
||
|
|
||
|
item = it->b->data[it->index];
|
||
|
it->index++;
|
||
|
it->counter--;
|
||
|
if (it->index == BLOCKLEN && it->counter > 0) {
|
||
|
assert (it->b->rightlink != NULL);
|
||
|
it->b = it->b->rightlink;
|
||
|
it->index = 0;
|
||
|
}
|
||
|
Py_INCREF(item);
|
||
|
return item;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
dequeiter_len(dequeiterobject *it)
|
||
|
{
|
||
|
return PyInt_FromLong(it->counter);
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
|
||
|
|
||
|
static PyMethodDef dequeiter_methods[] = {
|
||
|
{"__length_hint__", (PyCFunction)dequeiter_len, METH_NOARGS, length_hint_doc},
|
||
|
{NULL, NULL} /* sentinel */
|
||
|
};
|
||
|
|
||
|
static PyTypeObject dequeiter_type = {
|
||
|
PyVarObject_HEAD_INIT(NULL, 0)
|
||
|
"deque_iterator", /* tp_name */
|
||
|
sizeof(dequeiterobject), /* tp_basicsize */
|
||
|
0, /* tp_itemsize */
|
||
|
/* methods */
|
||
|
(destructor)dequeiter_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 */
|
||
|
PyObject_GenericGetAttr, /* tp_getattro */
|
||
|
0, /* tp_setattro */
|
||
|
0, /* tp_as_buffer */
|
||
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
|
||
|
0, /* tp_doc */
|
||
|
(traverseproc)dequeiter_traverse, /* tp_traverse */
|
||
|
0, /* tp_clear */
|
||
|
0, /* tp_richcompare */
|
||
|
0, /* tp_weaklistoffset */
|
||
|
PyObject_SelfIter, /* tp_iter */
|
||
|
(iternextfunc)dequeiter_next, /* tp_iternext */
|
||
|
dequeiter_methods, /* tp_methods */
|
||
|
0,
|
||
|
};
|
||
|
|
||
|
/*********************** Deque Reverse Iterator **************************/
|
||
|
|
||
|
static PyTypeObject dequereviter_type;
|
||
|
|
||
|
static PyObject *
|
||
|
deque_reviter(dequeobject *deque)
|
||
|
{
|
||
|
dequeiterobject *it;
|
||
|
|
||
|
it = PyObject_GC_New(dequeiterobject, &dequereviter_type);
|
||
|
if (it == NULL)
|
||
|
return NULL;
|
||
|
it->b = deque->rightblock;
|
||
|
it->index = deque->rightindex;
|
||
|
Py_INCREF(deque);
|
||
|
it->deque = deque;
|
||
|
it->state = deque->state;
|
||
|
it->counter = deque->len;
|
||
|
PyObject_GC_Track(it);
|
||
|
return (PyObject *)it;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
dequereviter_next(dequeiterobject *it)
|
||
|
{
|
||
|
PyObject *item;
|
||
|
if (it->counter == 0)
|
||
|
return NULL;
|
||
|
|
||
|
if (it->deque->state != it->state) {
|
||
|
it->counter = 0;
|
||
|
PyErr_SetString(PyExc_RuntimeError,
|
||
|
"deque mutated during iteration");
|
||
|
return NULL;
|
||
|
}
|
||
|
assert (!(it->b == it->deque->leftblock &&
|
||
|
it->index < it->deque->leftindex));
|
||
|
|
||
|
item = it->b->data[it->index];
|
||
|
it->index--;
|
||
|
it->counter--;
|
||
|
if (it->index == -1 && it->counter > 0) {
|
||
|
assert (it->b->leftlink != NULL);
|
||
|
it->b = it->b->leftlink;
|
||
|
it->index = BLOCKLEN - 1;
|
||
|
}
|
||
|
Py_INCREF(item);
|
||
|
return item;
|
||
|
}
|
||
|
|
||
|
static PyTypeObject dequereviter_type = {
|
||
|
PyVarObject_HEAD_INIT(NULL, 0)
|
||
|
"deque_reverse_iterator", /* tp_name */
|
||
|
sizeof(dequeiterobject), /* tp_basicsize */
|
||
|
0, /* tp_itemsize */
|
||
|
/* methods */
|
||
|
(destructor)dequeiter_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 */
|
||
|
PyObject_GenericGetAttr, /* tp_getattro */
|
||
|
0, /* tp_setattro */
|
||
|
0, /* tp_as_buffer */
|
||
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
|
||
|
0, /* tp_doc */
|
||
|
(traverseproc)dequeiter_traverse, /* tp_traverse */
|
||
|
0, /* tp_clear */
|
||
|
0, /* tp_richcompare */
|
||
|
0, /* tp_weaklistoffset */
|
||
|
PyObject_SelfIter, /* tp_iter */
|
||
|
(iternextfunc)dequereviter_next, /* tp_iternext */
|
||
|
dequeiter_methods, /* tp_methods */
|
||
|
0,
|
||
|
};
|
||
|
|
||
|
/* defaultdict type *********************************************************/
|
||
|
|
||
|
typedef struct {
|
||
|
PyDictObject dict;
|
||
|
PyObject *default_factory;
|
||
|
} defdictobject;
|
||
|
|
||
|
static PyTypeObject defdict_type; /* Forward */
|
||
|
|
||
|
PyDoc_STRVAR(defdict_missing_doc,
|
||
|
"__missing__(key) # Called by __getitem__ for missing key; pseudo-code:\n\
|
||
|
if self.default_factory is None: raise KeyError((key,))\n\
|
||
|
self[key] = value = self.default_factory()\n\
|
||
|
return value\n\
|
||
|
");
|
||
|
|
||
|
static PyObject *
|
||
|
defdict_missing(defdictobject *dd, PyObject *key)
|
||
|
{
|
||
|
PyObject *factory = dd->default_factory;
|
||
|
PyObject *value;
|
||
|
if (factory == NULL || factory == Py_None) {
|
||
|
/* XXX Call dict.__missing__(key) */
|
||
|
PyObject *tup;
|
||
|
tup = PyTuple_Pack(1, key);
|
||
|
if (!tup) return NULL;
|
||
|
PyErr_SetObject(PyExc_KeyError, tup);
|
||
|
Py_DECREF(tup);
|
||
|
return NULL;
|
||
|
}
|
||
|
value = PyEval_CallObject(factory, NULL);
|
||
|
if (value == NULL)
|
||
|
return value;
|
||
|
if (PyObject_SetItem((PyObject *)dd, key, value) < 0) {
|
||
|
Py_DECREF(value);
|
||
|
return NULL;
|
||
|
}
|
||
|
return value;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(defdict_copy_doc, "D.copy() -> a shallow copy of D.");
|
||
|
|
||
|
static PyObject *
|
||
|
defdict_copy(defdictobject *dd)
|
||
|
{
|
||
|
/* This calls the object's class. That only works for subclasses
|
||
|
whose class constructor has the same signature. Subclasses that
|
||
|
define a different constructor signature must override copy().
|
||
|
*/
|
||
|
|
||
|
if (dd->default_factory == NULL)
|
||
|
return PyObject_CallFunctionObjArgs((PyObject*)Py_TYPE(dd), Py_None, dd, NULL);
|
||
|
return PyObject_CallFunctionObjArgs((PyObject*)Py_TYPE(dd),
|
||
|
dd->default_factory, dd, NULL);
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
defdict_reduce(defdictobject *dd)
|
||
|
{
|
||
|
/* __reduce__ must return a 5-tuple as follows:
|
||
|
|
||
|
- factory function
|
||
|
- tuple of args for the factory function
|
||
|
- additional state (here None)
|
||
|
- sequence iterator (here None)
|
||
|
- dictionary iterator (yielding successive (key, value) pairs
|
||
|
|
||
|
This API is used by pickle.py and copy.py.
|
||
|
|
||
|
For this to be useful with pickle.py, the default_factory
|
||
|
must be picklable; e.g., None, a built-in, or a global
|
||
|
function in a module or package.
|
||
|
|
||
|
Both shallow and deep copying are supported, but for deep
|
||
|
copying, the default_factory must be deep-copyable; e.g. None,
|
||
|
or a built-in (functions are not copyable at this time).
|
||
|
|
||
|
This only works for subclasses as long as their constructor
|
||
|
signature is compatible; the first argument must be the
|
||
|
optional default_factory, defaulting to None.
|
||
|
*/
|
||
|
PyObject *args;
|
||
|
PyObject *items;
|
||
|
PyObject *result;
|
||
|
if (dd->default_factory == NULL || dd->default_factory == Py_None)
|
||
|
args = PyTuple_New(0);
|
||
|
else
|
||
|
args = PyTuple_Pack(1, dd->default_factory);
|
||
|
if (args == NULL)
|
||
|
return NULL;
|
||
|
items = PyObject_CallMethod((PyObject *)dd, "iteritems", "()");
|
||
|
if (items == NULL) {
|
||
|
Py_DECREF(args);
|
||
|
return NULL;
|
||
|
}
|
||
|
result = PyTuple_Pack(5, Py_TYPE(dd), args,
|
||
|
Py_None, Py_None, items);
|
||
|
Py_DECREF(items);
|
||
|
Py_DECREF(args);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
static PyMethodDef defdict_methods[] = {
|
||
|
{"__missing__", (PyCFunction)defdict_missing, METH_O,
|
||
|
defdict_missing_doc},
|
||
|
{"copy", (PyCFunction)defdict_copy, METH_NOARGS,
|
||
|
defdict_copy_doc},
|
||
|
{"__copy__", (PyCFunction)defdict_copy, METH_NOARGS,
|
||
|
defdict_copy_doc},
|
||
|
{"__reduce__", (PyCFunction)defdict_reduce, METH_NOARGS,
|
||
|
reduce_doc},
|
||
|
{NULL}
|
||
|
};
|
||
|
|
||
|
static PyMemberDef defdict_members[] = {
|
||
|
{"default_factory", T_OBJECT,
|
||
|
offsetof(defdictobject, default_factory), 0,
|
||
|
PyDoc_STR("Factory for default value called by __missing__().")},
|
||
|
{NULL}
|
||
|
};
|
||
|
|
||
|
static void
|
||
|
defdict_dealloc(defdictobject *dd)
|
||
|
{
|
||
|
Py_CLEAR(dd->default_factory);
|
||
|
PyDict_Type.tp_dealloc((PyObject *)dd);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
defdict_print(defdictobject *dd, FILE *fp, int flags)
|
||
|
{
|
||
|
int sts;
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fprintf(fp, "defaultdict(");
|
||
|
Py_END_ALLOW_THREADS
|
||
|
if (dd->default_factory == NULL) {
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fprintf(fp, "None");
|
||
|
Py_END_ALLOW_THREADS
|
||
|
} else {
|
||
|
PyObject_Print(dd->default_factory, fp, 0);
|
||
|
}
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fprintf(fp, ", ");
|
||
|
Py_END_ALLOW_THREADS
|
||
|
sts = PyDict_Type.tp_print((PyObject *)dd, fp, 0);
|
||
|
Py_BEGIN_ALLOW_THREADS
|
||
|
fprintf(fp, ")");
|
||
|
Py_END_ALLOW_THREADS
|
||
|
return sts;
|
||
|
}
|
||
|
|
||
|
static PyObject *
|
||
|
defdict_repr(defdictobject *dd)
|
||
|
{
|
||
|
PyObject *defrepr;
|
||
|
PyObject *baserepr;
|
||
|
PyObject *result;
|
||
|
baserepr = PyDict_Type.tp_repr((PyObject *)dd);
|
||
|
if (baserepr == NULL)
|
||
|
return NULL;
|
||
|
if (dd->default_factory == NULL)
|
||
|
defrepr = PyString_FromString("None");
|
||
|
else
|
||
|
{
|
||
|
int status = Py_ReprEnter(dd->default_factory);
|
||
|
if (status != 0) {
|
||
|
if (status < 0) {
|
||
|
Py_DECREF(baserepr);
|
||
|
return NULL;
|
||
|
}
|
||
|
defrepr = PyString_FromString("...");
|
||
|
}
|
||
|
else
|
||
|
defrepr = PyObject_Repr(dd->default_factory);
|
||
|
Py_ReprLeave(dd->default_factory);
|
||
|
}
|
||
|
if (defrepr == NULL) {
|
||
|
Py_DECREF(baserepr);
|
||
|
return NULL;
|
||
|
}
|
||
|
result = PyString_FromFormat("defaultdict(%s, %s)",
|
||
|
PyString_AS_STRING(defrepr),
|
||
|
PyString_AS_STRING(baserepr));
|
||
|
Py_DECREF(defrepr);
|
||
|
Py_DECREF(baserepr);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
defdict_traverse(PyObject *self, visitproc visit, void *arg)
|
||
|
{
|
||
|
Py_VISIT(((defdictobject *)self)->default_factory);
|
||
|
return PyDict_Type.tp_traverse(self, visit, arg);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
defdict_tp_clear(defdictobject *dd)
|
||
|
{
|
||
|
Py_CLEAR(dd->default_factory);
|
||
|
return PyDict_Type.tp_clear((PyObject *)dd);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
defdict_init(PyObject *self, PyObject *args, PyObject *kwds)
|
||
|
{
|
||
|
defdictobject *dd = (defdictobject *)self;
|
||
|
PyObject *olddefault = dd->default_factory;
|
||
|
PyObject *newdefault = NULL;
|
||
|
PyObject *newargs;
|
||
|
int result;
|
||
|
if (args == NULL || !PyTuple_Check(args))
|
||
|
newargs = PyTuple_New(0);
|
||
|
else {
|
||
|
Py_ssize_t n = PyTuple_GET_SIZE(args);
|
||
|
if (n > 0) {
|
||
|
newdefault = PyTuple_GET_ITEM(args, 0);
|
||
|
if (!PyCallable_Check(newdefault) && newdefault != Py_None) {
|
||
|
PyErr_SetString(PyExc_TypeError,
|
||
|
"first argument must be callable");
|
||
|
return -1;
|
||
|
}
|
||
|
}
|
||
|
newargs = PySequence_GetSlice(args, 1, n);
|
||
|
}
|
||
|
if (newargs == NULL)
|
||
|
return -1;
|
||
|
Py_XINCREF(newdefault);
|
||
|
dd->default_factory = newdefault;
|
||
|
result = PyDict_Type.tp_init(self, newargs, kwds);
|
||
|
Py_DECREF(newargs);
|
||
|
Py_XDECREF(olddefault);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
PyDoc_STRVAR(defdict_doc,
|
||
|
"defaultdict(default_factory[, ...]) --> dict with default factory\n\
|
||
|
\n\
|
||
|
The default factory is called without arguments to produce\n\
|
||
|
a new value when a key is not present, in __getitem__ only.\n\
|
||
|
A defaultdict compares equal to a dict with the same items.\n\
|
||
|
All remaining arguments are treated the same as if they were\n\
|
||
|
passed to the dict constructor, including keyword arguments.\n\
|
||
|
");
|
||
|
|
||
|
/* See comment in xxsubtype.c */
|
||
|
#define DEFERRED_ADDRESS(ADDR) 0
|
||
|
|
||
|
static PyTypeObject defdict_type = {
|
||
|
PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
|
||
|
"collections.defaultdict", /* tp_name */
|
||
|
sizeof(defdictobject), /* tp_basicsize */
|
||
|
0, /* tp_itemsize */
|
||
|
/* methods */
|
||
|
(destructor)defdict_dealloc, /* tp_dealloc */
|
||
|
(printfunc)defdict_print, /* tp_print */
|
||
|
0, /* tp_getattr */
|
||
|
0, /* tp_setattr */
|
||
|
0, /* tp_compare */
|
||
|
(reprfunc)defdict_repr, /* tp_repr */
|
||
|
0, /* tp_as_number */
|
||
|
0, /* tp_as_sequence */
|
||
|
0, /* tp_as_mapping */
|
||
|
0, /* tp_hash */
|
||
|
0, /* tp_call */
|
||
|
0, /* tp_str */
|
||
|
PyObject_GenericGetAttr, /* tp_getattro */
|
||
|
0, /* tp_setattro */
|
||
|
0, /* tp_as_buffer */
|
||
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |
|
||
|
Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */
|
||
|
defdict_doc, /* tp_doc */
|
||
|
defdict_traverse, /* tp_traverse */
|
||
|
(inquiry)defdict_tp_clear, /* tp_clear */
|
||
|
0, /* tp_richcompare */
|
||
|
0, /* tp_weaklistoffset*/
|
||
|
0, /* tp_iter */
|
||
|
0, /* tp_iternext */
|
||
|
defdict_methods, /* tp_methods */
|
||
|
defdict_members, /* tp_members */
|
||
|
0, /* tp_getset */
|
||
|
DEFERRED_ADDRESS(&PyDict_Type), /* tp_base */
|
||
|
0, /* tp_dict */
|
||
|
0, /* tp_descr_get */
|
||
|
0, /* tp_descr_set */
|
||
|
0, /* tp_dictoffset */
|
||
|
defdict_init, /* tp_init */
|
||
|
PyType_GenericAlloc, /* tp_alloc */
|
||
|
0, /* tp_new */
|
||
|
PyObject_GC_Del, /* tp_free */
|
||
|
};
|
||
|
|
||
|
/* module level code ********************************************************/
|
||
|
|
||
|
PyDoc_STRVAR(module_doc,
|
||
|
"High performance data structures.\n\
|
||
|
- deque: ordered collection accessible from endpoints only\n\
|
||
|
- defaultdict: dict subclass with a default value factory\n\
|
||
|
");
|
||
|
|
||
|
PyMODINIT_FUNC
|
||
|
init_collections(void)
|
||
|
{
|
||
|
PyObject *m;
|
||
|
|
||
|
m = Py_InitModule3("_collections", NULL, module_doc);
|
||
|
if (m == NULL)
|
||
|
return;
|
||
|
|
||
|
if (PyType_Ready(&deque_type) < 0)
|
||
|
return;
|
||
|
Py_INCREF(&deque_type);
|
||
|
PyModule_AddObject(m, "deque", (PyObject *)&deque_type);
|
||
|
|
||
|
defdict_type.tp_base = &PyDict_Type;
|
||
|
if (PyType_Ready(&defdict_type) < 0)
|
||
|
return;
|
||
|
Py_INCREF(&defdict_type);
|
||
|
PyModule_AddObject(m, "defaultdict", (PyObject *)&defdict_type);
|
||
|
|
||
|
if (PyType_Ready(&dequeiter_type) < 0)
|
||
|
return;
|
||
|
|
||
|
if (PyType_Ready(&dequereviter_type) < 0)
|
||
|
return;
|
||
|
|
||
|
return;
|
||
|
}
|