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100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* txtquery operations with 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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PG_FUNCTION_INFO_V1(ltxtq_exec);
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PG_FUNCTION_INFO_V1(ltxtq_rexec);
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/*
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* check for boolean condition
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*/
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bool
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ltree_execute(ITEM * curitem, void *checkval, bool calcnot, bool (*chkcond) (void *checkval, ITEM * val)) {
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if (curitem->type == VAL)
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return (*chkcond) (checkval, curitem);
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else if (curitem->val == (int4) '!') {
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return (calcnot) ?
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((ltree_execute(curitem + 1, checkval, calcnot, chkcond)) ? false : true)
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: true;
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} else if (curitem->val == (int4) '&') {
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if (ltree_execute(curitem + curitem->left, checkval, calcnot, chkcond))
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return ltree_execute(curitem + 1, checkval, calcnot, chkcond);
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else
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return false;
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} else { /* |-operator */
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if (ltree_execute(curitem + curitem->left, checkval, calcnot, chkcond))
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return true;
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else
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return ltree_execute(curitem + 1, checkval, calcnot, chkcond);
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}
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return false;
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}
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typedef struct {
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ltree *node;
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char *operand;
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} CHKVAL;
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static bool
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checkcondition_str(void* checkval, ITEM * val) {
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ltree_level *level = LTREE_FIRST( ((CHKVAL*)checkval)->node );
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int tlen = ((CHKVAL*)checkval)->node->numlevel;
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char *op = ((CHKVAL*)checkval)->operand + val->distance;
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int (*cmpptr)(const char *,const char *,size_t);
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cmpptr = ( val->flag & LVAR_INCASE ) ? strncasecmp : strncmp;
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while( tlen > 0 ) {
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if ( val->flag & LVAR_SUBLEXEM ) {
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if ( compare_subnode(level, op, val->length, cmpptr, (val->flag & LVAR_ANYEND) ) )
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return true;
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} else if (
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(
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val->length == level->len ||
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( level->len > val->length && (val->flag & LVAR_ANYEND) )
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) &&
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(*cmpptr)( op, level->name, val->length) == 0 )
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return true;
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tlen--;
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level = LEVEL_NEXT(level);
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}
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return false;
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}
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Datum
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ltxtq_exec(PG_FUNCTION_ARGS) {
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ltree *val = PG_GETARG_LTREE(0);
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ltxtquery *query = PG_GETARG_LTXTQUERY(1);
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CHKVAL chkval;
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bool result;
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chkval.node = val;
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chkval.operand = GETOPERAND(query);
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result = ltree_execute(
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GETQUERY(query),
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&chkval,
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true,
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checkcondition_str
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);
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PG_FREE_IF_COPY(val, 0);
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PG_FREE_IF_COPY(query, 1);
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PG_RETURN_BOOL(result);
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}
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Datum
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ltxtq_rexec(PG_FUNCTION_ARGS) {
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PG_RETURN_DATUM( DirectFunctionCall2( ltxtq_exec,
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PG_GETARG_DATUM(1),
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PG_GETARG_DATUM(0)
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) );
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}
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