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ruanhaishen
redis
Commits
5e21acec
Commit
5e21acec
authored
Apr 16, 2014
by
antirez
Browse files
ZLEXCOUNT implemented.
Like ZCOUNT for lexicographical ranges.
parent
00aa96f3
Changes
3
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src/redis.c
View file @
5e21acec
...
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@@ -179,6 +179,7 @@ struct redisCommand redisCommandTable[] = {
{"zrangebylex",zrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zrevrangebylex",zrevrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zcount",zcountCommand,4,"r",0,NULL,1,1,1,0,0},
{"zlexcount",zlexcountCommand,4,"r",0,NULL,1,1,1,0,0},
{"zrevrange",zrevrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zcard",zcardCommand,2,"r",0,NULL,1,1,1,0,0},
{"zscore",zscoreCommand,3,"r",0,NULL,1,1,1,0,0},
...
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src/redis.h
View file @
5e21acec
...
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@@ -1400,6 +1400,7 @@ void zrevrangebyscoreCommand(redisClient *c);
void
zrangebylexCommand
(
redisClient
*
c
);
void
zrevrangebylexCommand
(
redisClient
*
c
);
void
zcountCommand
(
redisClient
*
c
);
void
zlexcountCommand
(
redisClient
*
c
);
void
zrevrangeCommand
(
redisClient
*
c
);
void
zcardCommand
(
redisClient
*
c
);
void
zremCommand
(
redisClient
*
c
);
...
...
src/t_zset.c
View file @
5e21acec
...
...
@@ -2359,6 +2359,79 @@ void zcountCommand(redisClient *c) {
addReplyLongLong(c, count);
}
void zlexcountCommand(redisClient *c) {
robj *key = c->argv[1];
robj *zobj;
zlexrangespec range;
int count = 0;
/* Parse the range arguments */
if (zslParseLexRange(c->argv[2],c->argv[3],&range) != REDIS_OK) {
addReplyError(c,"min or max not valid string range item");
return;
}
/* Lookup the sorted set */
if ((zobj = lookupKeyReadOrReply(c, key, shared.czero)) == NULL ||
checkType(c, zobj, REDIS_ZSET)) return;
if (zobj->encoding == REDIS_ENCODING_ZIPLIST) {
unsigned char *zl = zobj->ptr;
unsigned char *eptr, *sptr;
/* Use the first element in range as the starting point */
eptr = zzlFirstInLexRange(zl,range);
/* No "first" element */
if (eptr == NULL) {
addReply(c, shared.czero);
return;
}
/* First element is in range */
sptr = ziplistNext(zl,eptr);
redisAssertWithInfo(c,zobj,zzlLexValueLteMax(eptr,&range));
/* Iterate over elements in range */
while (eptr) {
/* Abort when the node is no longer in range. */
if (!zzlLexValueLteMax(eptr,&range)) {
break;
} else {
count++;
zzlNext(zl,&eptr,&sptr);
}
}
} else if (zobj->encoding == REDIS_ENCODING_SKIPLIST) {
zset *zs = zobj->ptr;
zskiplist *zsl = zs->zsl;
zskiplistNode *zn;
unsigned long rank;
/* Find first element in range */
zn = zslFirstInLexRange(zsl, range);
/* Use rank of first element, if any, to determine preliminary count */
if (zn != NULL) {
rank = zslGetRank(zsl, zn->score, zn->obj);
count = (zsl->length - (rank - 1));
/* Find last element in range */
zn = zslLastInLexRange(zsl, range);
/* Use rank of last element, if any, to determine the actual count */
if (zn != NULL) {
rank = zslGetRank(zsl, zn->score, zn->obj);
count -= (zsl->length - rank);
}
}
} else {
redisPanic("Unknown sorted set encoding");
}
addReplyLongLong(c, count);
}
/* This command implements ZRANGEBYLEX, ZREVRANGEBYLEX. */
void genericZrangebylexCommand(redisClient *c, int reverse) {
zlexrangespec range;
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