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Add a function pg_get_keywords() to let clients find out the set of keywords

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known to the SQL parser.  Dave Page
This commit is contained in:
Tom Lane
2008-07-03 20:58:47 +00:00
parent e3d9dceef6
commit c63147d6f0
7 changed files with 109 additions and 9 deletions
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73
src/backend/utils/adt/misc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.62 2008/04/17 20:56:41 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.63 2008/07/03 20:58:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -20,10 +20,12 @@
#include <math.h>
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "catalog/pg_tablespace.h"
#include "commands/dbcommands.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "parser/keywords.h"
#include "postmaster/syslogger.h"
#include "storage/fd.h"
#include "storage/pmsignal.h"
@ -322,3 +324,72 @@ pg_sleep(PG_FUNCTION_ARGS)
PG_RETURN_VOID();
}
/* Function to return the list of grammar keywords */
Datum
pg_get_keywords(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
if (SRF_IS_FIRSTCALL())
{
MemoryContext oldcontext;
TupleDesc tupdesc;
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
tupdesc = CreateTemplateTupleDesc(3, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "word",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "catcode",
CHAROID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "catdesc",
TEXTOID, -1, 0);
funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
if (&ScanKeywords[funcctx->call_cntr] < LastScanKeyword)
{
char *values[3];
HeapTuple tuple;
/* cast-away-const is ugly but alternatives aren't much better */
values[0] = (char *) ScanKeywords[funcctx->call_cntr].name;
switch (ScanKeywords[funcctx->call_cntr].category)
{
case UNRESERVED_KEYWORD:
values[1] = "U";
values[2] = _("Unreserved");
break;
case COL_NAME_KEYWORD:
values[1] = "C";
values[2] = _("Column name");
break;
case TYPE_FUNC_NAME_KEYWORD:
values[1] = "T";
values[2] = _("Type or function name");
break;
case RESERVED_KEYWORD:
values[1] = "R";
values[2] = _("Reserved");
break;
default: /* shouldn't be possible */
values[1] = NULL;
values[2] = NULL;
break;
}
tuple = BuildTupleFromCStrings(funcctx->attinmeta, values);
SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
}
SRF_RETURN_DONE(funcctx);
}