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/* $Id$
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __FAUHDLSCANNER_HPP_INCLUDED
#define __FAUHDLSCANNER_HPP_INCLUDED
/* make sure that yyFlexLexer will not get declared more than once */
#undef yyFlexLexer
#include <FlexLexer.h>
#include <string>
namespace yy {
/** custom lexer class with a overloaded yylex function
*/
class FAUhdlScanner : public yyFlexLexer {
public:
// arg_yyin and arg_yyout default to the cin and cout, but we
// only make that assignment when initializing in yylex().
FAUhdlScanner(
std::istream* arg_yyin = 0,
std::ostream* arg_yyout = 0
) : yyFlexLexer(arg_yyin, arg_yyout),
bracesCtr(0),
isAssociation(false),
backup(std::string()),
scannedForAssociation(false) {}
virtual ~FAUhdlScanner() {}
/* defined from flex via mangling in ParserDriver.hpp for *this*
* class */
virtual FAUhdlParser::token_type
yylex(
yy::FAUhdlParser::semantic_type* yylval,
FAUhdlParser::location_type* yylloc,
ParserDriver& driver
);
private:
/** unput all characters stored in backup */
void putBack(void) {
for (std::string::reverse_iterator i = this->backup.rbegin();
i != this->backup.rend(); i++) {
/* evil: copied definition of macro unput */
this->yyunput(*i, yytext);
}
}
/** reset bracesCtr, isAssociation and backup */
void reset(void) {
this->bracesCtr = 0;
this->isAssociation = false;
this->backup = "";
}
/** braces counter (e.g. association list checking ) */
int bracesCtr;
/** is an association? */
bool isAssociation;
/** backup stack for lookahead scanning. */
std::string backup;
/** already scanned for an association? */
bool scannedForAssociation;
};
}
#endif /* __FAUHDLSCANNER_HPP_INCLUDED */
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