greenplumn ltree_io 源码
greenplumn ltree_io 代码
文件路径：/contrib/ltree/ltree_io.c
/*
* in/out function for ltree and lquery
* Teodor Sigaev <teodor@stack.net>
* contrib/ltree/ltree_io.c
*/
#include "postgres.h"
#include <ctype.h>
#include "ltree.h"
#include "utils/memutils.h"
#include "crc32.h"
PG_FUNCTION_INFO_V1(ltree_in);
PG_FUNCTION_INFO_V1(ltree_out);
PG_FUNCTION_INFO_V1(lquery_in);
PG_FUNCTION_INFO_V1(lquery_out);
#define UNCHAR ereport(ERROR, \
(errcode(ERRCODE_SYNTAX_ERROR), \
errmsg("syntax error at position %d", \
pos)));
typedef struct
{
char *start;
int len; /* length in bytes */
int flag;
int wlen; /* length in characters */
} nodeitem;
#define LTPRS_WAITNAME 0
#define LTPRS_WAITDELIM 1
Datum
ltree_in(PG_FUNCTION_ARGS)
{
char *buf = (char *) PG_GETARG_POINTER(0);
char *ptr;
nodeitem *list,
*lptr;
int num = 0,
totallen = 0;
int state = LTPRS_WAITNAME;
ltree *result;
ltree_level *curlevel;
int charlen;
int pos = 0;
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (charlen == 1 && t_iseq(ptr, '.'))
num++;
ptr += charlen;
}
if (num + 1 > MaxAllocSize / sizeof(nodeitem))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of levels (%d) exceeds the maximum allowed (%d)",
num + 1, (int) (MaxAllocSize / sizeof(nodeitem)))));
list = lptr = (nodeitem *) palloc(sizeof(nodeitem) * (num + 1));
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (state == LTPRS_WAITNAME)
{
if (ISALNUM(ptr))
{
lptr->start = ptr;
lptr->wlen = 0;
state = LTPRS_WAITDELIM;
}
else
UNCHAR;
}
else if (state == LTPRS_WAITDELIM)
{
if (charlen == 1 && t_iseq(ptr, '.'))
{
lptr->len = ptr - lptr->start;
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
totallen += MAXALIGN(lptr->len + LEVEL_HDRSIZE);
lptr++;
state = LTPRS_WAITNAME;
}
else if (!ISALNUM(ptr))
UNCHAR;
}
else
/* internal error */
elog(ERROR, "internal error in parser");
ptr += charlen;
lptr->wlen++;
pos++;
}
if (state == LTPRS_WAITDELIM)
{
lptr->len = ptr - lptr->start;
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
totallen += MAXALIGN(lptr->len + LEVEL_HDRSIZE);
lptr++;
}
else if (!(state == LTPRS_WAITNAME && lptr == list))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
result = (ltree *) palloc0(LTREE_HDRSIZE + totallen);
SET_VARSIZE(result, LTREE_HDRSIZE + totallen);
result->numlevel = lptr - list;
curlevel = LTREE_FIRST(result);
lptr = list;
while (lptr - list < result->numlevel)
{
curlevel->len = (uint16) lptr->len;
memcpy(curlevel->name, lptr->start, lptr->len);
curlevel = LEVEL_NEXT(curlevel);
lptr++;
}
pfree(list);
PG_RETURN_POINTER(result);
}
Datum
ltree_out(PG_FUNCTION_ARGS)
{
ltree *in = PG_GETARG_LTREE_P(0);
char *buf,
*ptr;
int i;
ltree_level *curlevel;
ptr = buf = (char *) palloc(VARSIZE(in));
curlevel = LTREE_FIRST(in);
for (i = 0; i < in->numlevel; i++)
{
if (i != 0)
{
*ptr = '.';
ptr++;
}
memcpy(ptr, curlevel->name, curlevel->len);
ptr += curlevel->len;
curlevel = LEVEL_NEXT(curlevel);
}
*ptr = '\0';
PG_FREE_IF_COPY(in, 0);
PG_RETURN_POINTER(buf);
}
#define LQPRS_WAITLEVEL 0
#define LQPRS_WAITDELIM 1
#define LQPRS_WAITOPEN 2
#define LQPRS_WAITFNUM 3
#define LQPRS_WAITSNUM 4
#define LQPRS_WAITND 5
#define LQPRS_WAITCLOSE 6
#define LQPRS_WAITEND 7
#define LQPRS_WAITVAR 8
#define GETVAR(x) ( *((nodeitem**)LQL_FIRST(x)) )
#define ITEMSIZE MAXALIGN(LQL_HDRSIZE+sizeof(nodeitem*))
#define NEXTLEV(x) ( (lquery_level*)( ((char*)(x)) + ITEMSIZE) )
Datum
lquery_in(PG_FUNCTION_ARGS)
{
char *buf = (char *) PG_GETARG_POINTER(0);
char *ptr;
int num = 0,
totallen = 0,
numOR = 0;
int state = LQPRS_WAITLEVEL;
lquery *result;
nodeitem *lptr = NULL;
lquery_level *cur,
*curqlevel,
*tmpql;
lquery_variant *lrptr = NULL;
bool hasnot = false;
bool wasbad = false;
int charlen;
int pos = 0;
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (charlen == 1)
{
if (t_iseq(ptr, '.'))
num++;
else if (t_iseq(ptr, '|'))
numOR++;
}
ptr += charlen;
}
num++;
if (num > MaxAllocSize / ITEMSIZE)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of levels (%d) exceeds the maximum allowed (%d)",
num, (int) (MaxAllocSize / ITEMSIZE))));
curqlevel = tmpql = (lquery_level *) palloc0(ITEMSIZE * num);
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (state == LQPRS_WAITLEVEL)
{
if (ISALNUM(ptr))
{
GETVAR(curqlevel) = lptr = (nodeitem *) palloc0(sizeof(nodeitem) * (numOR + 1));
lptr->start = ptr;
state = LQPRS_WAITDELIM;
curqlevel->numvar = 1;
}
else if (charlen == 1 && t_iseq(ptr, '!'))
{
GETVAR(curqlevel) = lptr = (nodeitem *) palloc0(sizeof(nodeitem) * (numOR + 1));
lptr->start = ptr + 1;
state = LQPRS_WAITDELIM;
curqlevel->numvar = 1;
curqlevel->flag |= LQL_NOT;
hasnot = true;
}
else if (charlen == 1 && t_iseq(ptr, '*'))
state = LQPRS_WAITOPEN;
else
UNCHAR;
}
else if (state == LQPRS_WAITVAR)
{
if (ISALNUM(ptr))
{
lptr++;
lptr->start = ptr;
state = LQPRS_WAITDELIM;
curqlevel->numvar++;
}
else
UNCHAR;
}
else if (state == LQPRS_WAITDELIM)
{
if (charlen == 1 && t_iseq(ptr, '@'))
{
if (lptr->start == ptr)
UNCHAR;
lptr->flag |= LVAR_INCASE;
curqlevel->flag |= LVAR_INCASE;
}
else if (charlen == 1 && t_iseq(ptr, '*'))
{
if (lptr->start == ptr)
UNCHAR;
lptr->flag |= LVAR_ANYEND;
curqlevel->flag |= LVAR_ANYEND;
}
else if (charlen == 1 && t_iseq(ptr, '%'))
{
if (lptr->start == ptr)
UNCHAR;
lptr->flag |= LVAR_SUBLEXEME;
curqlevel->flag |= LVAR_SUBLEXEME;
}
else if (charlen == 1 && t_iseq(ptr, '|'))
{
lptr->len = ptr - lptr->start -
((lptr->flag & LVAR_SUBLEXEME) ? 1 : 0) -
((lptr->flag & LVAR_INCASE) ? 1 : 0) -
((lptr->flag & LVAR_ANYEND) ? 1 : 0);
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
state = LQPRS_WAITVAR;
}
else if (charlen == 1 && t_iseq(ptr, '.'))
{
lptr->len = ptr - lptr->start -
((lptr->flag & LVAR_SUBLEXEME) ? 1 : 0) -
((lptr->flag & LVAR_INCASE) ? 1 : 0) -
((lptr->flag & LVAR_ANYEND) ? 1 : 0);
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
state = LQPRS_WAITLEVEL;
curqlevel = NEXTLEV(curqlevel);
}
else if (ISALNUM(ptr))
{
if (lptr->flag)
UNCHAR;
}
else
UNCHAR;
}
else if (state == LQPRS_WAITOPEN)
{
if (charlen == 1 && t_iseq(ptr, '{'))
state = LQPRS_WAITFNUM;
else if (charlen == 1 && t_iseq(ptr, '.'))
{
curqlevel->low = 0;
curqlevel->high = 0xffff;
curqlevel = NEXTLEV(curqlevel);
state = LQPRS_WAITLEVEL;
}
else
UNCHAR;
}
else if (state == LQPRS_WAITFNUM)
{
if (charlen == 1 && t_iseq(ptr, ','))
state = LQPRS_WAITSNUM;
else if (t_isdigit(ptr))
{
curqlevel->low = atoi(ptr);
state = LQPRS_WAITND;
}
else
UNCHAR;
}
else if (state == LQPRS_WAITSNUM)
{
if (t_isdigit(ptr))
{
curqlevel->high = atoi(ptr);
state = LQPRS_WAITCLOSE;
}
else if (charlen == 1 && t_iseq(ptr, '}'))
{
curqlevel->high = 0xffff;
state = LQPRS_WAITEND;
}
else
UNCHAR;
}
else if (state == LQPRS_WAITCLOSE)
{
if (charlen == 1 && t_iseq(ptr, '}'))
state = LQPRS_WAITEND;
else if (!t_isdigit(ptr))
UNCHAR;
}
else if (state == LQPRS_WAITND)
{
if (charlen == 1 && t_iseq(ptr, '}'))
{
curqlevel->high = curqlevel->low;
state = LQPRS_WAITEND;
}
else if (charlen == 1 && t_iseq(ptr, ','))
state = LQPRS_WAITSNUM;
else if (!t_isdigit(ptr))
UNCHAR;
}
else if (state == LQPRS_WAITEND)
{
if (charlen == 1 && t_iseq(ptr, '.'))
{
state = LQPRS_WAITLEVEL;
curqlevel = NEXTLEV(curqlevel);
}
else
UNCHAR;
}
else
/* internal error */
elog(ERROR, "internal error in parser");
ptr += charlen;
if (state == LQPRS_WAITDELIM)
lptr->wlen++;
pos++;
}
if (state == LQPRS_WAITDELIM)
{
if (lptr->start == ptr)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
lptr->len = ptr - lptr->start -
((lptr->flag & LVAR_SUBLEXEME) ? 1 : 0) -
((lptr->flag & LVAR_INCASE) ? 1 : 0) -
((lptr->flag & LVAR_ANYEND) ? 1 : 0);
if (lptr->len == 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
}
else if (state == LQPRS_WAITOPEN)
curqlevel->high = 0xffff;
else if (state != LQPRS_WAITEND)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
curqlevel = tmpql;
totallen = LQUERY_HDRSIZE;
while ((char *) curqlevel - (char *) tmpql < num * ITEMSIZE)
{
totallen += LQL_HDRSIZE;
if (curqlevel->numvar)
{
lptr = GETVAR(curqlevel);
while (lptr - GETVAR(curqlevel) < curqlevel->numvar)
{
totallen += MAXALIGN(LVAR_HDRSIZE + lptr->len);
lptr++;
}
}
else if (curqlevel->low > curqlevel->high)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Low limit(%d) is greater than upper(%d).",
curqlevel->low, curqlevel->high)));
curqlevel = NEXTLEV(curqlevel);
}
result = (lquery *) palloc0(totallen);
SET_VARSIZE(result, totallen);
result->numlevel = num;
result->firstgood = 0;
result->flag = 0;
if (hasnot)
result->flag |= LQUERY_HASNOT;
cur = LQUERY_FIRST(result);
curqlevel = tmpql;
while ((char *) curqlevel - (char *) tmpql < num * ITEMSIZE)
{
memcpy(cur, curqlevel, LQL_HDRSIZE);
cur->totallen = LQL_HDRSIZE;
if (curqlevel->numvar)
{
lrptr = LQL_FIRST(cur);
lptr = GETVAR(curqlevel);
while (lptr - GETVAR(curqlevel) < curqlevel->numvar)
{
cur->totallen += MAXALIGN(LVAR_HDRSIZE + lptr->len);
lrptr->len = lptr->len;
lrptr->flag = lptr->flag;
lrptr->val = ltree_crc32_sz(lptr->start, lptr->len);
memcpy(lrptr->name, lptr->start, lptr->len);
lptr++;
lrptr = LVAR_NEXT(lrptr);
}
pfree(GETVAR(curqlevel));
if (cur->numvar > 1 || cur->flag != 0)
wasbad = true;
else if (wasbad == false)
(result->firstgood)++;
}
else
wasbad = true;
curqlevel = NEXTLEV(curqlevel);
cur = LQL_NEXT(cur);
}
pfree(tmpql);
PG_RETURN_POINTER(result);
}
Datum
lquery_out(PG_FUNCTION_ARGS)
{
lquery *in = PG_GETARG_LQUERY_P(0);
char *buf,
*ptr;
int i,
j,
totallen = 1;
lquery_level *curqlevel;
lquery_variant *curtlevel;
curqlevel = LQUERY_FIRST(in);
for (i = 0; i < in->numlevel; i++)
{
totallen++;
if (curqlevel->numvar)
totallen += 1 + (curqlevel->numvar * 4) + curqlevel->totallen;
else
totallen += 2 * 11 + 4;
curqlevel = LQL_NEXT(curqlevel);
}
ptr = buf = (char *) palloc(totallen);
curqlevel = LQUERY_FIRST(in);
for (i = 0; i < in->numlevel; i++)
{
if (i != 0)
{
*ptr = '.';
ptr++;
}
if (curqlevel->numvar)
{
if (curqlevel->flag & LQL_NOT)
{
*ptr = '!';
ptr++;
}
curtlevel = LQL_FIRST(curqlevel);
for (j = 0; j < curqlevel->numvar; j++)
{
if (j != 0)
{
*ptr = '|';
ptr++;
}
memcpy(ptr, curtlevel->name, curtlevel->len);
ptr += curtlevel->len;
if ((curtlevel->flag & LVAR_SUBLEXEME))
{
*ptr = '%';
ptr++;
}
if ((curtlevel->flag & LVAR_INCASE))
{
*ptr = '@';
ptr++;
}
if ((curtlevel->flag & LVAR_ANYEND))
{
*ptr = '*';
ptr++;
}
curtlevel = LVAR_NEXT(curtlevel);
}
}
else
{
if (curqlevel->low == curqlevel->high)
{
sprintf(ptr, "*{%d}", curqlevel->low);
}
else if (curqlevel->low == 0)
{
if (curqlevel->high == 0xffff)
{
*ptr = '*';
*(ptr + 1) = '\0';
}
else
sprintf(ptr, "*{,%d}", curqlevel->high);
}
else if (curqlevel->high == 0xffff)
{
sprintf(ptr, "*{%d,}", curqlevel->low);
}
else
sprintf(ptr, "*{%d,%d}", curqlevel->low, curqlevel->high);
ptr = strchr(ptr, '\0');
}
curqlevel = LQL_NEXT(curqlevel);
}
*ptr = '\0';
PG_FREE_IF_COPY(in, 0);
PG_RETURN_POINTER(buf);
}
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