blob: 2a4b49e5b0695b1082e7fb79f3636a3f516b5a98 [file] [log] [blame]
/*
* For PostgreSQL Database Management System:
* (formerly known as Postgres, then as Postgres95)
*
* Portions Copyright (c) 1996-2010, The PostgreSQL Global Development Group
*
* Portions Copyright (c) 1994, The Regents of the University of California
*
* Permission to use, copy, modify, and distribute this software and its documentation for any purpose,
* without fee, and without a written agreement is hereby granted, provided that the above copyright notice
* and this paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT,
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY
* OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA
* HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include "postgres.h"
#include "catalog/pg_type_d.h"
#include "common/keywords.h"
#include "funcapi.h"
#include "parser/cypher_gram.h"
#include "parser/cypher_kwlist_d.h"
/*
* This list must be sorted by ASCII name, because binary search is used to
* locate entries.
*/
#define PG_KEYWORD(kwname, value, category) value,
const uint16 CypherKeywordTokens[] = {
#include "parser/cypher_kwlist.h"
};
#undef PG_KEYWORD
#define PG_KEYWORD(kwname, value, category) category,
const uint16 CypherKeywordCategories[] = {
#include "parser/cypher_kwlist.h"
};
#undef PG_KEYWORD
PG_FUNCTION_INFO_V1(get_cypher_keywords);
/* function to return the list of grammar keywords */
Datum get_cypher_keywords(PG_FUNCTION_ARGS)
{
FuncCallContext *func_ctx;
if (SRF_IS_FIRSTCALL())
{
MemoryContext old_mem_ctx;
TupleDesc tup_desc;
func_ctx = SRF_FIRSTCALL_INIT();
old_mem_ctx = MemoryContextSwitchTo(func_ctx->multi_call_memory_ctx);
tup_desc = CreateTemplateTupleDesc(3);
TupleDescInitEntry(tup_desc, (AttrNumber)1, "word", TEXTOID, -1, 0);
TupleDescInitEntry(tup_desc, (AttrNumber)2, "catcode", CHAROID, -1, 0);
TupleDescInitEntry(tup_desc, (AttrNumber)3, "catdesc", TEXTOID, -1, 0);
func_ctx->attinmeta = TupleDescGetAttInMetadata(tup_desc);
MemoryContextSwitchTo(old_mem_ctx);
}
func_ctx = SRF_PERCALL_SETUP();
if (func_ctx->call_cntr < CypherKeyword.num_keywords)
{
char *values[3];
HeapTuple tuple;
/* cast-away-const is ugly but alternatives aren't much better */
values[0] = (char *) GetScanKeyword((int) func_ctx->call_cntr,
&CypherKeyword);
switch (CypherKeywordCategories[func_ctx->call_cntr])
{
case UNRESERVED_KEYWORD:
values[1] = "U";
values[2] = "unreserved";
break;
case COL_NAME_KEYWORD:
values[1] = "C";
values[2] = "unreserved (cannot be function or type name)";
break;
case TYPE_FUNC_NAME_KEYWORD:
values[1] = "T";
values[2] = "reserved (can be function or type 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(func_ctx->attinmeta, values);
SRF_RETURN_NEXT(func_ctx, HeapTupleGetDatum(tuple));
}
SRF_RETURN_DONE(func_ctx);
}