311 lines
6.4 KiB
C
311 lines
6.4 KiB
C
|
/*
|
||
|
|
* op function for ltree
|
||
|
|
* Teodor Sigaev <teodor@stack.net>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ltree.h"
|
||
|
|
#include <ctype.h>
|
||
|
|
|
||
|
|
/* compare functions */
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_cmp);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_lt);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_le);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_eq);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_ne);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_ge);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_gt);
|
||
|
|
PG_FUNCTION_INFO_V1(nlevel);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_isparent);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_risparent);
|
||
|
|
PG_FUNCTION_INFO_V1(subltree);
|
||
|
|
PG_FUNCTION_INFO_V1(subpath);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_addltree);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_addtext);
|
||
|
|
PG_FUNCTION_INFO_V1(ltree_textadd);
|
||
|
|
Datum ltree_cmp(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_lt(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_le(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_eq(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_ne(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_ge(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_gt(PG_FUNCTION_ARGS);
|
||
|
|
Datum nlevel(PG_FUNCTION_ARGS);
|
||
|
|
Datum subltree(PG_FUNCTION_ARGS);
|
||
|
|
Datum subpath(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_addltree(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_addtext(PG_FUNCTION_ARGS);
|
||
|
|
Datum ltree_textadd(PG_FUNCTION_ARGS);
|
||
|
|
|
||
|
|
int
|
||
|
|
ltree_compare(const ltree *a, const ltree *b) {
|
||
|
|
ltree_level *al = LTREE_FIRST(a);
|
||
|
|
ltree_level *bl = LTREE_FIRST(b);
|
||
|
|
int an = a->numlevel;
|
||
|
|
int bn = b->numlevel;
|
||
|
|
int res = 0;
|
||
|
|
|
||
|
|
while( an>0 && bn>0 ) {
|
||
|
|
if ( (res = strncmp( al->name, bl->name, min(al->len, bl->len))) == 0 ) {
|
||
|
|
if ( al->len != bl->len )
|
||
|
|
return (al->len - bl->len)*10*(an+1);
|
||
|
|
} else
|
||
|
|
return res*10*(an+1);
|
||
|
|
|
||
|
|
an--; bn--;
|
||
|
|
al = LEVEL_NEXT(al);
|
||
|
|
bl = LEVEL_NEXT(bl);
|
||
|
|
}
|
||
|
|
|
||
|
|
return (a->numlevel - b->numlevel)*10*(an+1);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define RUNCMP \
|
||
|
|
ltree *a = PG_GETARG_LTREE(0); \
|
||
|
|
ltree *b = PG_GETARG_LTREE(1); \
|
||
|
|
int res = ltree_compare(a,b); \
|
||
|
|
PG_FREE_IF_COPY(a,0); \
|
||
|
|
PG_FREE_IF_COPY(b,1); \
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_cmp(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_INT32(res);
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_lt(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res<0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_le(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res<=0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_eq(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res==0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_ge(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res>=0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_gt(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res>0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_ne(PG_FUNCTION_ARGS) {
|
||
|
|
RUNCMP
|
||
|
|
PG_RETURN_BOOL( (res!=0) ? true : false );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
nlevel(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *a = PG_GETARG_LTREE(0);
|
||
|
|
int res = a->numlevel;
|
||
|
|
PG_FREE_IF_COPY(a,0);
|
||
|
|
PG_RETURN_INT32(res);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
inner_isparent(const ltree *c, const ltree *p) {
|
||
|
|
ltree_level *cl = LTREE_FIRST(c);
|
||
|
|
ltree_level *pl = LTREE_FIRST(p);
|
||
|
|
int pn = p->numlevel;
|
||
|
|
|
||
|
|
if ( pn > c->numlevel )
|
||
|
|
return false;
|
||
|
|
|
||
|
|
while( pn>0 ) {
|
||
|
|
if ( cl->len != pl->len )
|
||
|
|
return false;
|
||
|
|
if ( strncmp( cl->name, pl->name, cl->len ) )
|
||
|
|
return false;
|
||
|
|
|
||
|
|
pn--;
|
||
|
|
cl = LEVEL_NEXT(cl);
|
||
|
|
pl = LEVEL_NEXT(pl);
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_isparent(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *c = PG_GETARG_LTREE(1);
|
||
|
|
ltree *p = PG_GETARG_LTREE(0);
|
||
|
|
bool res = inner_isparent(c,p);
|
||
|
|
PG_FREE_IF_COPY(c,1);
|
||
|
|
PG_FREE_IF_COPY(p,0);
|
||
|
|
PG_RETURN_BOOL( res );
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_risparent(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *c = PG_GETARG_LTREE(0);
|
||
|
|
ltree *p = PG_GETARG_LTREE(1);
|
||
|
|
bool res = inner_isparent(c,p);
|
||
|
|
PG_FREE_IF_COPY(c,0);
|
||
|
|
PG_FREE_IF_COPY(p,1);
|
||
|
|
PG_RETURN_BOOL( res );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static ltree*
|
||
|
|
inner_subltree(ltree *t, int4 startpos, int4 endpos) {
|
||
|
|
char *start=NULL,*end=NULL;
|
||
|
|
ltree_level *ptr = LTREE_FIRST(t);
|
||
|
|
ltree *res;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if ( startpos <0 || endpos <0 || startpos>=t->numlevel || startpos >= endpos )
|
||
|
|
elog(ERROR,"Wrong positions");
|
||
|
|
|
||
|
|
if ( endpos > t->numlevel )
|
||
|
|
endpos = t->numlevel;
|
||
|
|
|
||
|
|
for(i=0;i<endpos ;i++) {
|
||
|
|
if ( i==startpos )
|
||
|
|
start = (char*)ptr;
|
||
|
|
if ( i==endpos-1 ) {
|
||
|
|
end = (char*)LEVEL_NEXT(ptr);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
ptr = LEVEL_NEXT(ptr);
|
||
|
|
}
|
||
|
|
|
||
|
|
res=(ltree*)palloc( LTREE_HDRSIZE + (end-start) );
|
||
|
|
res->len = LTREE_HDRSIZE + (end-start);
|
||
|
|
res->numlevel = endpos-startpos;
|
||
|
|
|
||
|
|
memcpy( LTREE_FIRST(res), start, end-start);
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
subltree(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *t = PG_GETARG_LTREE(0);
|
||
|
|
ltree *res = inner_subltree(t,PG_GETARG_INT32(1),PG_GETARG_INT32(2));
|
||
|
|
|
||
|
|
PG_FREE_IF_COPY(t,0);
|
||
|
|
PG_RETURN_POINTER(res);
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
subpath(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *t = PG_GETARG_LTREE(0);
|
||
|
|
int4 start = PG_GETARG_INT32(1);
|
||
|
|
int4 len = ( fcinfo->nargs==3 ) ? PG_GETARG_INT32(2) : 0;
|
||
|
|
int4 end;
|
||
|
|
ltree *res;
|
||
|
|
|
||
|
|
end = start+len;
|
||
|
|
|
||
|
|
if ( start < 0 ) {
|
||
|
|
start = t->numlevel + start;
|
||
|
|
end = start+len;
|
||
|
|
}
|
||
|
|
if ( start < 0 ) { /* start > t->numlevel */
|
||
|
|
start = t->numlevel + start;
|
||
|
|
end = start+len;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( len < 0 )
|
||
|
|
end = t->numlevel + len;
|
||
|
|
else if ( len == 0 )
|
||
|
|
end = 0xffff;
|
||
|
|
|
||
|
|
res = inner_subltree(t,start,end);
|
||
|
|
|
||
|
|
PG_FREE_IF_COPY(t,0);
|
||
|
|
PG_RETURN_POINTER(res);
|
||
|
|
}
|
||
|
|
|
||
|
|
static ltree*
|
||
|
|
ltree_concat( ltree *a, ltree *b) {
|
||
|
|
ltree *r;
|
||
|
|
r=(ltree*)palloc( a->len + b->len - LTREE_HDRSIZE);
|
||
|
|
r->len = a->len + b->len - LTREE_HDRSIZE;
|
||
|
|
r->numlevel = a->numlevel + b->numlevel;
|
||
|
|
|
||
|
|
memcpy( LTREE_FIRST(r), LTREE_FIRST(a), a->len - LTREE_HDRSIZE);
|
||
|
|
memcpy( ((char*)LTREE_FIRST(r))+ a->len - LTREE_HDRSIZE, LTREE_FIRST(b), b->len -
|
||
|
|
LTREE_HDRSIZE);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_addltree(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *a = PG_GETARG_LTREE(0);
|
||
|
|
ltree *b = PG_GETARG_LTREE(1);
|
||
|
|
ltree *r;
|
||
|
|
|
||
|
|
r = ltree_concat(a, b);
|
||
|
|
PG_FREE_IF_COPY(a,0);
|
||
|
|
PG_FREE_IF_COPY(b,1);
|
||
|
|
PG_RETURN_POINTER(r);
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_addtext(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *a = PG_GETARG_LTREE(0);
|
||
|
|
text *b = PG_GETARG_TEXT_P(1);
|
||
|
|
char *s;
|
||
|
|
ltree *r,*tmp;
|
||
|
|
|
||
|
|
s = (char*)palloc( VARSIZE(b) - VARHDRSZ+1 );
|
||
|
|
memcpy(s, VARDATA(b), VARSIZE(b) - VARHDRSZ );
|
||
|
|
s[VARSIZE(b) - VARHDRSZ] = '\0';
|
||
|
|
|
||
|
|
tmp = (ltree*)DatumGetPointer( DirectFunctionCall1(
|
||
|
|
ltree_in,
|
||
|
|
PointerGetDatum(s)
|
||
|
|
) );
|
||
|
|
|
||
|
|
pfree(s);
|
||
|
|
|
||
|
|
r = ltree_concat(a,tmp);
|
||
|
|
|
||
|
|
pfree( tmp );
|
||
|
|
|
||
|
|
PG_FREE_IF_COPY(a,0);
|
||
|
|
PG_FREE_IF_COPY(b,1);
|
||
|
|
PG_RETURN_POINTER(r);
|
||
|
|
}
|
||
|
|
|
||
|
|
Datum
|
||
|
|
ltree_textadd(PG_FUNCTION_ARGS) {
|
||
|
|
ltree *a = PG_GETARG_LTREE(1);
|
||
|
|
text *b = PG_GETARG_TEXT_P(0);
|
||
|
|
char *s;
|
||
|
|
ltree *r,*tmp;
|
||
|
|
|
||
|
|
s = (char*)palloc( VARSIZE(b) - VARHDRSZ + 1 );
|
||
|
|
memcpy(s, VARDATA(b), VARSIZE(b) - VARHDRSZ );
|
||
|
|
s[VARSIZE(b) - VARHDRSZ] = '\0';
|
||
|
|
|
||
|
|
tmp = (ltree*)DatumGetPointer( DirectFunctionCall1(
|
||
|
|
ltree_in,
|
||
|
|
PointerGetDatum(s)
|
||
|
|
) );
|
||
|
|
|
||
|
|
pfree(s);
|
||
|
|
|
||
|
|
r = ltree_concat(tmp,a);
|
||
|
|
|
||
|
|
pfree( tmp );
|
||
|
|
|
||
|
|
PG_FREE_IF_COPY(a,1);
|
||
|
|
PG_FREE_IF_COPY(b,0);
|
||
|
|
PG_RETURN_POINTER(r);
|
||
|
|
}
|