/*
* regexp_matches()
* Return a table of matches of a pattern within a string.
*/
Datum
regexp_matches(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
regexp_matches_ctx *matchctx;
if (SRF_IS_FIRSTCALL())
{
text *pattern = PG_GETARG_TEXT_PP(1);
text *flags = PG_GETARG_TEXT_PP_IF_EXISTS(2);
MemoryContext oldcontext;
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* be sure to copy the input string into the multi-call ctx */
matchctx = setup_regexp_matches(PG_GETARG_TEXT_P_COPY(0), pattern,
flags,
PG_GET_COLLATION(),
false, true, false);
/* Pre-create workspace that build_regexp_matches_result needs */
matchctx->elems = (Datum *) palloc(sizeof(Datum) * matchctx->npatterns);
matchctx->nulls = (bool *) palloc(sizeof(bool) * matchctx->npatterns);
MemoryContextSwitchTo(oldcontext);
funcctx->user_fctx = (void *) matchctx;
}
funcctx = SRF_PERCALL_SETUP();
matchctx = (regexp_matches_ctx *) funcctx->user_fctx;
if (matchctx->next_match < matchctx->nmatches)
{
ArrayType *result_ary;
result_ary = build_regexp_matches_result(matchctx);
matchctx->next_match++;
SRF_RETURN_NEXT(funcctx, PointerGetDatum(result_ary));
}
/* release space in multi-call ctx to avoid intraquery memory leak */
cleanup_regexp_matches(matchctx);
SRF_RETURN_DONE(funcctx);
}
/*
* regexp_split_to_table()
* Split the string at matches of the pattern, returning the
* split-out substrings as a table.
*/
Datum
regexp_split_to_table(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
regexp_matches_ctx *splitctx;
if (SRF_IS_FIRSTCALL())
{
text *pattern = PG_GETARG_TEXT_PP(1);
text *flags = PG_GETARG_TEXT_PP_IF_EXISTS(2);
MemoryContext oldcontext;
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* be sure to copy the input string into the multi-call ctx */
splitctx = setup_regexp_matches(PG_GETARG_TEXT_P_COPY(0), pattern,
flags,
PG_GET_COLLATION(),
true, false, true);
MemoryContextSwitchTo(oldcontext);
funcctx->user_fctx = (void *) splitctx;
}
funcctx = SRF_PERCALL_SETUP();
splitctx = (regexp_matches_ctx *) funcctx->user_fctx;
if (splitctx->next_match <= splitctx->nmatches)
{
Datum result = build_regexp_split_result(splitctx);
splitctx->next_match++;
SRF_RETURN_NEXT(funcctx, result);
}
/* release space in multi-call ctx to avoid intraquery memory leak */
cleanup_regexp_matches(splitctx);
SRF_RETURN_DONE(funcctx);
}
/*
* regexp_matches()
* Return a table of matches of a pattern within a string.
*/
datum_t regexp_matches(PG_FUNC_ARGS)
{
struct fcall_ctx *funcctx;
regexp_matches_ctx *matchctx;
if (SRF_IS_FIRSTCALL()) {
text *pattern = ARG_TEXT_PP(1);
text *flags = ARG_TEXT_PP_IF_EXISTS(2);
struct mctx * oldcontext;
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = mctx_switch(funcctx->multi_call_memory_ctx);
/* be sure to copy the input string into the multi-call ctx */
matchctx = setup_regexp_matches(ARG_TEXT_P_COPY(0), pattern,
flags, PG_COLLATION(), false, true, false);
/* Pre-create workspace that build_regexp_matches_result needs */
matchctx->elems = (datum_t *) palloc(sizeof(datum_t) * matchctx->npatterns);
matchctx->nulls = (bool *) palloc(sizeof(bool) * matchctx->npatterns);
mctx_switch(oldcontext);
funcctx->user_fctx = (void *)matchctx;
}
funcctx = SRF_PERCALL_SETUP();
matchctx = (regexp_matches_ctx *) funcctx->user_fctx;
if (matchctx->next_match < matchctx->nmatches) {
array_s *result_ary;
result_ary = build_regexp_matches_result(matchctx);
matchctx->next_match++;
SRF_RETURN_NEXT(funcctx, PTR_TO_D(result_ary));
}
/* release space in multi-call ctx to avoid intraquery memory leak */
cleanup_regexp_matches(matchctx);
SRF_RETURN_DONE(funcctx);
}
