mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-03 08:00:21 +08:00
baf6c8d21d
CHANGES
Mar 28, 2003
Added finctions index(ltree,ltree,offset), text2ltree(text),
ltree2text(text)
Teodor Sigaev
543 lines
10 KiB
C
543 lines
10 KiB
C
/*
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* op function for ltree
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* Teodor Sigaev <teodor@stack.net>
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*/
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#include "ltree.h"
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#include <ctype.h>
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/* compare functions */
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PG_FUNCTION_INFO_V1(ltree_cmp);
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PG_FUNCTION_INFO_V1(ltree_lt);
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PG_FUNCTION_INFO_V1(ltree_le);
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PG_FUNCTION_INFO_V1(ltree_eq);
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PG_FUNCTION_INFO_V1(ltree_ne);
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PG_FUNCTION_INFO_V1(ltree_ge);
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PG_FUNCTION_INFO_V1(ltree_gt);
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PG_FUNCTION_INFO_V1(nlevel);
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PG_FUNCTION_INFO_V1(ltree_isparent);
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PG_FUNCTION_INFO_V1(ltree_risparent);
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PG_FUNCTION_INFO_V1(subltree);
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PG_FUNCTION_INFO_V1(subpath);
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PG_FUNCTION_INFO_V1(ltree_index);
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PG_FUNCTION_INFO_V1(ltree_addltree);
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PG_FUNCTION_INFO_V1(ltree_addtext);
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PG_FUNCTION_INFO_V1(ltree_textadd);
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PG_FUNCTION_INFO_V1(lca);
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PG_FUNCTION_INFO_V1(ltree2text);
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PG_FUNCTION_INFO_V1(text2ltree);
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Datum ltree_cmp(PG_FUNCTION_ARGS);
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Datum ltree_lt(PG_FUNCTION_ARGS);
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Datum ltree_le(PG_FUNCTION_ARGS);
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Datum ltree_eq(PG_FUNCTION_ARGS);
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Datum ltree_ne(PG_FUNCTION_ARGS);
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Datum ltree_ge(PG_FUNCTION_ARGS);
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Datum ltree_gt(PG_FUNCTION_ARGS);
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Datum nlevel(PG_FUNCTION_ARGS);
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Datum subltree(PG_FUNCTION_ARGS);
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Datum subpath(PG_FUNCTION_ARGS);
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Datum ltree_index(PG_FUNCTION_ARGS);
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Datum ltree_addltree(PG_FUNCTION_ARGS);
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Datum ltree_addtext(PG_FUNCTION_ARGS);
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Datum ltree_textadd(PG_FUNCTION_ARGS);
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Datum lca(PG_FUNCTION_ARGS);
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Datum ltree2text(PG_FUNCTION_ARGS);
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Datum text2ltree(PG_FUNCTION_ARGS);
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int
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ltree_compare(const ltree * a, const ltree * b)
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{
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ltree_level *al = LTREE_FIRST(a);
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ltree_level *bl = LTREE_FIRST(b);
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int an = a->numlevel;
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int bn = b->numlevel;
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int res = 0;
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while (an > 0 && bn > 0)
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{
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if ((res = strncmp(al->name, bl->name, min(al->len, bl->len))) == 0)
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{
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if (al->len != bl->len)
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return (al->len - bl->len) * 10 * (an + 1);
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}
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else
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return res * 10 * (an + 1);
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an--;
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bn--;
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al = LEVEL_NEXT(al);
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bl = LEVEL_NEXT(bl);
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}
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return (a->numlevel - b->numlevel) * 10 * (an + 1);
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}
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#define RUNCMP \
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ltree *a = PG_GETARG_LTREE(0); \
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ltree *b = PG_GETARG_LTREE(1); \
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int res = ltree_compare(a,b); \
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PG_FREE_IF_COPY(a,0); \
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PG_FREE_IF_COPY(b,1); \
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Datum
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ltree_cmp(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_INT32(res);
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}
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Datum
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ltree_lt(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res < 0) ? true : false);
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}
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Datum
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ltree_le(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res <= 0) ? true : false);
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}
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Datum
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ltree_eq(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res == 0) ? true : false);
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}
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Datum
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ltree_ge(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res >= 0) ? true : false);
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}
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Datum
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ltree_gt(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res > 0) ? true : false);
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}
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Datum
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ltree_ne(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res != 0) ? true : false);
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}
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Datum
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nlevel(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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int res = a->numlevel;
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PG_FREE_IF_COPY(a, 0);
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PG_RETURN_INT32(res);
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}
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bool
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inner_isparent(const ltree * c, const ltree * p)
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{
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ltree_level *cl = LTREE_FIRST(c);
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ltree_level *pl = LTREE_FIRST(p);
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int pn = p->numlevel;
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if (pn > c->numlevel)
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return false;
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while (pn > 0)
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{
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if (cl->len != pl->len)
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return false;
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if (strncmp(cl->name, pl->name, cl->len))
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return false;
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pn--;
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cl = LEVEL_NEXT(cl);
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pl = LEVEL_NEXT(pl);
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}
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return true;
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}
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Datum
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ltree_isparent(PG_FUNCTION_ARGS)
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{
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ltree *c = PG_GETARG_LTREE(1);
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ltree *p = PG_GETARG_LTREE(0);
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bool res = inner_isparent(c, p);
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PG_FREE_IF_COPY(c, 1);
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PG_FREE_IF_COPY(p, 0);
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PG_RETURN_BOOL(res);
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}
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Datum
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ltree_risparent(PG_FUNCTION_ARGS)
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{
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ltree *c = PG_GETARG_LTREE(0);
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ltree *p = PG_GETARG_LTREE(1);
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bool res = inner_isparent(c, p);
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PG_FREE_IF_COPY(c, 0);
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PG_FREE_IF_COPY(p, 1);
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PG_RETURN_BOOL(res);
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}
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static ltree *
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inner_subltree(ltree * t, int4 startpos, int4 endpos)
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{
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char *start = NULL,
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*end = NULL;
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ltree_level *ptr = LTREE_FIRST(t);
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ltree *res;
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int i;
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if (startpos < 0 || endpos < 0 || startpos >= t->numlevel || startpos >= endpos)
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elog(ERROR, "Wrong positions");
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if (endpos > t->numlevel)
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endpos = t->numlevel;
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for (i = 0; i < endpos; i++)
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{
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if (i == startpos)
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start = (char *) ptr;
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if (i == endpos - 1)
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{
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end = (char *) LEVEL_NEXT(ptr);
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break;
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}
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ptr = LEVEL_NEXT(ptr);
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}
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res = (ltree *) palloc(LTREE_HDRSIZE + (end - start));
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res->len = LTREE_HDRSIZE + (end - start);
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res->numlevel = endpos - startpos;
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memcpy(LTREE_FIRST(res), start, end - start);
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return res;
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}
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Datum
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subltree(PG_FUNCTION_ARGS)
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{
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ltree *t = PG_GETARG_LTREE(0);
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ltree *res = inner_subltree(t, PG_GETARG_INT32(1), PG_GETARG_INT32(2));
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PG_FREE_IF_COPY(t, 0);
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PG_RETURN_POINTER(res);
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}
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Datum
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subpath(PG_FUNCTION_ARGS)
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{
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ltree *t = PG_GETARG_LTREE(0);
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int4 start = PG_GETARG_INT32(1);
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int4 len = (fcinfo->nargs == 3) ? PG_GETARG_INT32(2) : 0;
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int4 end;
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ltree *res;
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end = start + len;
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if (start < 0)
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{
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start = t->numlevel + start;
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end = start + len;
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}
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if (start < 0)
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{ /* start > t->numlevel */
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start = t->numlevel + start;
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end = start + len;
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}
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if (len < 0)
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end = t->numlevel + len;
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else if (len == 0)
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end = 0xffff;
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res = inner_subltree(t, start, end);
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PG_FREE_IF_COPY(t, 0);
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PG_RETURN_POINTER(res);
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}
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static ltree *
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ltree_concat(ltree * a, ltree * b)
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{
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ltree *r;
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r = (ltree *) palloc(a->len + b->len - LTREE_HDRSIZE);
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r->len = a->len + b->len - LTREE_HDRSIZE;
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r->numlevel = a->numlevel + b->numlevel;
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memcpy(LTREE_FIRST(r), LTREE_FIRST(a), a->len - LTREE_HDRSIZE);
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memcpy(((char *) LTREE_FIRST(r)) + a->len - LTREE_HDRSIZE, LTREE_FIRST(b), b->len -
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LTREE_HDRSIZE);
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return r;
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}
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Datum
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ltree_addltree(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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ltree *b = PG_GETARG_LTREE(1);
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ltree *r;
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r = ltree_concat(a, b);
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_POINTER(r);
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}
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Datum
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ltree_addtext(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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text *b = PG_GETARG_TEXT_P(1);
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char *s;
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ltree *r,
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*tmp;
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s = (char *) palloc(VARSIZE(b) - VARHDRSZ + 1);
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memcpy(s, VARDATA(b), VARSIZE(b) - VARHDRSZ);
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s[VARSIZE(b) - VARHDRSZ] = '\0';
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tmp = (ltree *) DatumGetPointer(DirectFunctionCall1(
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ltree_in,
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PointerGetDatum(s)
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));
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pfree(s);
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r = ltree_concat(a, tmp);
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pfree(tmp);
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_POINTER(r);
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}
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Datum
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ltree_index(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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ltree *b = PG_GETARG_LTREE(1);
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int start=(fcinfo->nargs == 3) ? PG_GETARG_INT32(2) : 0;
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int i,j;
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ltree_level *startptr, *aptr, *bptr;
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bool found=false;
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if ( start < 0 ) {
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if ( -start >= a->numlevel )
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start=0;
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else
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start = (int)(a->numlevel)+start;
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}
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if ( a->numlevel - start < b->numlevel || a->numlevel==0 || b->numlevel==0 ) {
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_INT32(-1);
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}
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startptr=LTREE_FIRST(a);
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for(i=0; i<=a->numlevel-b->numlevel; i++) {
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if ( i>=start ) {
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aptr=startptr;
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bptr=LTREE_FIRST(b);
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for(j=0;j<b->numlevel;j++) {
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if ( !(aptr->len==bptr->len && strncmp(aptr->name,bptr->name, aptr->len)==0) )
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break;
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aptr=LEVEL_NEXT(aptr);
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bptr=LEVEL_NEXT(bptr);
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}
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if ( j==b->numlevel ) {
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found=true;
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break;
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}
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}
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startptr=LEVEL_NEXT(startptr);
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}
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if ( !found )
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i=-1;
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_INT32(i);
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}
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Datum
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ltree_textadd(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(1);
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text *b = PG_GETARG_TEXT_P(0);
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char *s;
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ltree *r,
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*tmp;
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s = (char *) palloc(VARSIZE(b) - VARHDRSZ + 1);
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memcpy(s, VARDATA(b), VARSIZE(b) - VARHDRSZ);
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s[VARSIZE(b) - VARHDRSZ] = '\0';
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tmp = (ltree *) DatumGetPointer(DirectFunctionCall1(
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ltree_in,
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PointerGetDatum(s)
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));
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pfree(s);
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r = ltree_concat(tmp, a);
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pfree(tmp);
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PG_FREE_IF_COPY(a, 1);
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PG_FREE_IF_COPY(b, 0);
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PG_RETURN_POINTER(r);
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}
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ltree *
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lca_inner(ltree ** a, int len)
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{
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int tmp,
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num = ((*a)->numlevel) ? (*a)->numlevel - 1 : 0;
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ltree **ptr = a + 1;
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int i,
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reslen = LTREE_HDRSIZE;
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ltree_level *l1,
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*l2;
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ltree *res;
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if ((*a)->numlevel == 0)
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return NULL;
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while (ptr - a < len)
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{
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if ((*ptr)->numlevel == 0)
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return NULL;
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else if ((*ptr)->numlevel == 1)
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num = 0;
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else
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{
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l1 = LTREE_FIRST(*a);
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l2 = LTREE_FIRST(*ptr);
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tmp = num;
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num = 0;
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for (i = 0; i < min(tmp, (*ptr)->numlevel - 1); i++)
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{
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if (l1->len == l2->len && strncmp(l1->name, l2->name, l1->len) == 0)
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num = i + 1;
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else
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break;
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l1 = LEVEL_NEXT(l1);
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l2 = LEVEL_NEXT(l2);
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}
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}
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ptr++;
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}
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l1 = LTREE_FIRST(*a);
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for (i = 0; i < num; i++)
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{
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reslen += MAXALIGN(l1->len + LEVEL_HDRSIZE);
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l1 = LEVEL_NEXT(l1);
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}
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res = (ltree *) palloc(reslen);
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res->len = reslen;
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res->numlevel = num;
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l1 = LTREE_FIRST(*a);
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l2 = LTREE_FIRST(res);
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for (i = 0; i < num; i++)
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{
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memcpy(l2, l1, MAXALIGN(l1->len + LEVEL_HDRSIZE));
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l1 = LEVEL_NEXT(l1);
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l2 = LEVEL_NEXT(l2);
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}
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return res;
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}
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Datum
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lca(PG_FUNCTION_ARGS)
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{
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int i;
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ltree **a,
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*res;
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a = (ltree **) palloc(sizeof(ltree *) * fcinfo->nargs);
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for (i = 0; i < fcinfo->nargs; i++)
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a[i] = PG_GETARG_LTREE(i);
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res = lca_inner(a, (int) fcinfo->nargs);
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for (i = 0; i < fcinfo->nargs; i++)
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PG_FREE_IF_COPY(a[i], i);
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pfree(a);
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if (res)
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PG_RETURN_POINTER(res);
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else
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PG_RETURN_NULL();
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}
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Datum
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text2ltree(PG_FUNCTION_ARGS)
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{
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text *in = PG_GETARG_TEXT_P(0);
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char *s = (char *) palloc(VARSIZE(in) - VARHDRSZ + 1);
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ltree *out;
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memcpy(s, VARDATA(in), VARSIZE(in) - VARHDRSZ);
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s[VARSIZE(in) - VARHDRSZ] = '\0';
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out = (ltree *) DatumGetPointer(DirectFunctionCall1(
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ltree_in,
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PointerGetDatum(s)
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));
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pfree(s);
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PG_FREE_IF_COPY(in,0);
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PG_RETURN_POINTER(out);
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}
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Datum
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ltree2text(PG_FUNCTION_ARGS)
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{
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ltree *in = PG_GETARG_LTREE(0);
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char *ptr;
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int i;
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ltree_level *curlevel;
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text *out;
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out=(text*)palloc(in->len+VARHDRSZ);
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ptr = VARDATA(out);
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curlevel = LTREE_FIRST(in);
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for (i = 0; i < in->numlevel; i++) {
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if (i != 0) {
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*ptr = '.';
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ptr++;
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}
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memcpy(ptr, curlevel->name, curlevel->len);
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ptr += curlevel->len;
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curlevel = LEVEL_NEXT(curlevel);
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}
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VARATT_SIZEP(out) = VARHDRSZ + (ptr-VARDATA(out));
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PG_FREE_IF_COPY(in, 0);
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PG_RETURN_POINTER(out);
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}
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