/*

Copyright (c) 2007 Carl Byington - 510 Software Group, released under
the GPL version 3 or any later version at your choice available at
http://www.gnu.org/licenses/gpl-3.0.txt

*/


using namespace std;

struct ltstr {
	bool operator()(char* s1, char* s2) const {
		return strcmp(s1, s2) < 0;
	}
};

typedef list<ifstream *>	stream_list;
typedef list<char *>		string_list;
typedef set<char *, ltstr>	string_set;
typedef list<int>			line_list;

class TOKEN {
	stream_list streams;
	string_list filenames;
	string_set	filenamess;
	line_list	linenumbers;
	string_list pending_tokens;
	string_set	*include_files;
	bool		pushed;
	u_char		pushed_char;

	void pop();
	bool next_char(u_char &c);
	void push_char(u_char c);

public:
	TOKEN(char *fn, string_set *includes);
	~TOKEN();
	bool		include(char *fn);
	char		*next();			// return next token
	int 		nextint();
	void		skipeol();			// skip to eol
	void		push(char *token)			{pending_tokens.push_front(token);};
	const char	*cur_fn()					{return filenames.empty()	? "" : filenames.front();};
	int 		cur_line()					{return linenumbers.empty() ? 0  : linenumbers.front();};
	void		token_error(const char *err);
	void		token_error(const char *fmt, int d, const char *s);
	void		token_error(const char *fmt, const char *t, const char *h);
	void		token_error(const char *want, const char *have);
	void		token_error();
};