/*
 * SysDB - src/frontend/scanner.l
 * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

%{

#include "frontend/connection.h"
#include "frontend/parser.h"
#include "frontend/grammar.h"
#include "utils/error.h"

#include <errno.h>

#include <string.h>

#define YY_EXTRA_TYPE sdb_fe_yyextra_t *

void
sdb_fe_yyerror(YYLTYPE *lval, sdb_fe_yyscan_t scanner, const char *msg);

%}

%option never-interactive
%option reentrant
%option bison-bridge
%option bison-locations
%option 8bit
%option yylineno
%option nodefault
%option noinput
%option nounput
%option noyywrap
%option verbose
%option warn
%option prefix="sdb_fe_yy" outfile="lex.yy.c"

%x CSC

whitespace		([ \t\n\r\f]+)
simple_comment	("--"[^\n\r]*)

/*
 * C style comments
 */
csc_start	\/\*
csc_inside	([^*/]+|[^*]\/|\*[^/])
csc_end		\*\/

identifier	([A-Za-z_][A-Za-z_0-9$]*)

%%

{whitespace} |
{simple_comment}	{ /* ignore */ }

{csc_start}			{ BEGIN(CSC); }
<CSC>{csc_inside}	{ /* ignore */ }
<CSC>{csc_end}		{ BEGIN(INITIAL); }
<CSC><<EOF>> {
		sdb_fe_yyerror(yylval, yyscanner, "unterminated C-style comment");
		return SCANNER_ERROR;
	}

{identifier} {
		/* XXX */
		if (! strcasecmp(yytext, "LIST"))
			return LIST;

		return IDENTIFIER;
	}

.	{ /* do nothing for now */ }

%%

sdb_fe_yyscan_t
sdb_fe_scanner_init(const char *str, int len, sdb_fe_yyextra_t *yyext)
{
	yyscan_t scanner;

	if (! str)
		return NULL;

	if (sdb_fe_yylex_init(&scanner)) {
		char errbuf[1024];
		sdb_log(SDB_LOG_ERR, "frontend: yylex_init failed: %s",
			sdb_strerror(errno, errbuf, sizeof(errbuf)));
		return NULL;
	}

	sdb_fe_yyset_extra(yyext, scanner);

	if (len < 0)
		len = strlen(str);

	/* the newly allocated buffer state (YY_BUFFER_STATE) is stored inside the
	 * scanner and, thus, will be freed by yylex_destroy */
	sdb_fe_yy_scan_bytes(str, len, scanner);
	return scanner;
} /* sdb_fe_scanner_init */

void
sdb_fe_scanner_destroy(sdb_fe_yyscan_t scanner)
{
	sdb_fe_yylex_destroy(scanner);
} /* sdb_fe_scanner_destroy */

/* vim: set tw=78 sw=4 ts=4 noexpandtab : */