/*-------------------------------------------------------------------------
 *
 * parser.c
 *		Main entry point/driver for PostgreSQL grammar
 *
 * Note that the grammar is not allowed to perform any table access
 * (since we need to be able to do basic parsing even while inside an
 * aborted transaction).  Therefore, the data structures returned by
 * the grammar are "raw" parsetrees that still need to be analyzed by
 * analyze.c and related files.
 *
 *
 * Portions Copyright (c) 2003-2016, PgPool Global Development Group
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *	  src/backend/parser/parser.c
 *
 *-------------------------------------------------------------------------
 */

#include <string.h>
#include "pool_parser.h"
#include "utils/palloc.h"
#include "gramparse.h"	/* required before parser/gram.h! */
#include "gram.h"
#include "parser.h"
#include "pg_wchar.h"
#include "utils/elog.h"

int server_version_num = 0;
static pg_enc server_encoding = PG_SQL_ASCII;

static int
parse_version(const char *versionString);


/*
 * raw_parser
 *		Given a query in string form, do lexical and grammatical analysis.
 *
 * Returns a list of raw (un-analyzed) parse trees.
 * Set *error to true if there's any parse error.
 */
List *
raw_parser(const char *str, bool *error)
{
	core_yyscan_t yyscanner;
	base_yy_extra_type yyextra;
	int			yyresult;

    MemoryContext oldContext = CurrentMemoryContext;

	/* initialize error flag */
	*error = false;

	/* initialize the flex scanner */
	yyscanner = scanner_init(str, &yyextra.core_yy_extra,
							 ScanKeywords, NumScanKeywords);

	/* base_yylex() only needs this much initialization */
	yyextra.have_lookahead = false;

	/* initialize the bison parser */
	parser_init(&yyextra);

	PG_TRY();
	{
		/* Parse! */
		yyresult = base_yyparse(yyscanner);

		/* Clean up (release memory) */
		scanner_finish(yyscanner);
	}
	PG_CATCH();
	{
		MemoryContextSwitchTo(oldContext);
		scanner_finish(yyscanner);
		yyresult = -1;
		FlushErrorState();
	}
	PG_END_TRY();

	if (yyresult)				/* error */
	{
		*error = true;
		return NIL;
	}

	return yyextra.parsetree;
}


/*
 * Intermediate filter between parser and core lexer (core_yylex in scan.l).
 *
 * This filter is needed because in some cases the standard SQL grammar
 * requires more than one token lookahead.  We reduce these cases to one-token
 * lookahead by replacing tokens here, in order to keep the grammar LALR(1).
 *
 * Using a filter is simpler than trying to recognize multiword tokens
 * directly in scan.l, because we'd have to allow for comments between the
 * words.  Furthermore it's not clear how to do that without re-introducing
 * scanner backtrack, which would cost more performance than this filter
 * layer does.
 *
 * The filter also provides a convenient place to translate between
 * the core_YYSTYPE and YYSTYPE representations (which are really the
 * same thing anyway, but notationally they're different).
 */
int
base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp, core_yyscan_t yyscanner)
{
	base_yy_extra_type *yyextra = pg_yyget_extra(yyscanner);
	int			cur_token;
	int			next_token;
	int			cur_token_length;
	YYLTYPE		cur_yylloc;

	/* Get next token --- we might already have it */
	if (yyextra->have_lookahead)
	{
		cur_token = yyextra->lookahead_token;
		lvalp->core_yystype = yyextra->lookahead_yylval;
		*llocp = yyextra->lookahead_yylloc;
		*(yyextra->lookahead_end) = yyextra->lookahead_hold_char;
		yyextra->have_lookahead = false;
	}
	else
		cur_token = core_yylex(&(lvalp->core_yystype), llocp, yyscanner);

	/*
	 * If this token isn't one that requires lookahead, just return it.  If it
	 * does, determine the token length.  (We could get that via strlen(), but
	 * since we have such a small set of possibilities, hardwiring seems
	 * feasible and more efficient.)
	 */
	switch (cur_token)
	{
		case NOT:
			cur_token_length = 3;
			break;
		case NULLS_P:
			cur_token_length = 5;
			break;
		case WITH:
			cur_token_length = 4;
			break;
		default:
			return cur_token;
	}

	/*
	 * Identify end+1 of current token.  core_yylex() has temporarily stored a
	 * '\0' here, and will undo that when we call it again.  We need to redo
	 * it to fully revert the lookahead call for error reporting purposes.
	 */
	yyextra->lookahead_end = yyextra->core_yy_extra.scanbuf +
		*llocp + cur_token_length;
	Assert(*(yyextra->lookahead_end) == '\0');

	/*
	 * Save and restore *llocp around the call.  It might look like we could
	 * avoid this by just passing &lookahead_yylloc to core_yylex(), but that
	 * does not work because flex actually holds onto the last-passed pointer
	 * internally, and will use that for error reporting.  We need any error
	 * reports to point to the current token, not the next one.
	 */
	cur_yylloc = *llocp;

	/* Get next token, saving outputs into lookahead variables */
	next_token = core_yylex(&(yyextra->lookahead_yylval), llocp, yyscanner);
	yyextra->lookahead_token = next_token;
	yyextra->lookahead_yylloc = *llocp;

	*llocp = cur_yylloc;

	/* Now revert the un-truncation of the current token */
	yyextra->lookahead_hold_char = *(yyextra->lookahead_end);
	*(yyextra->lookahead_end) = '\0';

	yyextra->have_lookahead = true;

	/* Replace cur_token if needed, based on lookahead */
	switch (cur_token)
	{
		case NOT:
			/* Replace NOT by NOT_LA if it's followed by BETWEEN, IN, etc */
			switch (next_token)
			{
				case BETWEEN:
				case IN_P:
				case LIKE:
				case ILIKE:
				case SIMILAR:
					cur_token = NOT_LA;
					break;
			}
			break;

		case NULLS_P:
			/* Replace NULLS_P by NULLS_LA if it's followed by FIRST or LAST */
			switch (next_token)
			{
				case FIRST_P:
				case LAST_P:
					cur_token = NULLS_LA;
					break;
			}
			break;

		case WITH:
			/* Replace WITH by WITH_LA if it's followed by TIME or ORDINALITY */
			switch (next_token)
			{
				case TIME:
				case ORDINALITY:
					cur_token = WITH_LA;
					break;
			}
			break;
	}

	return cur_token;
}

static int
parse_version(const char *versionString)
{
	int			cnt;
	int			vmaj,
	vmin,
	vrev;

	cnt = sscanf(versionString, "%d.%d.%d", &vmaj, &vmin, &vrev);

	if (cnt < 2)
		return -1;

	if (cnt == 2)
		vrev = 0;

	return (100 * vmaj + vmin) * 100 + vrev;
}

void
parser_set_param(const char *name, const char *value)
{
	if (strcmp(name, "server_version") == 0)
	{
		server_version_num = parse_version(value);
	}
	else if (strcmp(name, "server_encoding") == 0)
	{
		if (strcmp(value, "UTF8") == 0)
			server_encoding = PG_UTF8;
		else
			server_encoding = PG_SQL_ASCII;
	}
	else if (strcmp(name, "standard_conforming_strings") == 0)
	{
		if (strcmp(value, "on") == 0)
			standard_conforming_strings = true;
		else
			standard_conforming_strings = false;
	}
}

int
GetDatabaseEncoding(void)
{
	return server_encoding;
}

int
pg_mblen(const char *mbstr)
{
	return pg_utf_mblen((const unsigned char *) mbstr);
}

