/*
lwcc/cpp/cpp.h

Copyright © 2013 William Astle

This file is part of LWTOOLS.

LWTOOLS is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef cpp_h_seen___
#define cpp_h_seen___

#include <stdio.h>

enum
{
	CPP_NOUNG = -3,
	CPP_EOL = -2,
	CPP_EOF = -1,
};

enum
{
	TOK_NONE = 0,
	TOK_EOF,
	TOK_EOL,
	TOK_WSPACE,
	TOK_IDENT,
	TOK_NUMBER,
	TOK_STRING,
	TOK_CHAR,
	TOK_DIV,
	TOK_MUL,
	TOK_ADD,
	TOK_SUB,
	TOK_OPAREN,
	TOK_CPAREN,
	TOK_NE,
	TOK_EQ,
	TOK_LE,
	TOK_LT,
	TOK_GE,
	TOK_GT,
	TOK_BAND,
	TOK_BOR,
	TOK_BNOT,
	TOK_MAX
};

struct token
{
	int ttype;				// token type
	char *strval;			// string value of token - the text it matched
};

struct file_stack_e
{
	const char *fn;
	FILE *fp;
	struct file_stack_e *next;
	int line;
	int col;
	int eolstate;			// end of line state for interpreting \r\n \n\r \n \r
	int ra;					// read ahead byte for trigraph scan
	int qseen;				// number of ? seen during trigraph scan
	int unget;				// character that has been "ungot"
	int curc;				// the most recent character retrieved
	int *ungetbuf;			// buffer for "unfetch"
	int ungetbufl;			// length offset in unget buffer
	int ungetbufs;			// size of unget buffer
};

struct symtab_e
{
	char *name;				// the symbol identifier
	struct symtab_e *next;	// next symbol in table
	char *strval;			// the actual value of the macro
	int nargs;				// number of fixed args; -1 for basic, >= 0 for function like
	int vargs;				// set if macro is varargs
};

extern struct symtab_e *symbol_find(const char *);
extern void symbol_undef(const char *);
extern struct symtab_e *symbol_add(const char *, const char *, int, int);

extern FILE *output_fp;
extern int trigraphs;
extern struct file_stack_e *file_stack;

extern int process_file(const char *);
extern void preprocess_file(void);
extern void preprocess_output_location(int);

extern void do_error(const char *, ...);
extern void do_warning(const char *, ...);

extern int fetch_byte(void);
extern void unfetch_byte(int);
extern void outchr(int);
extern void outstr(char *);
extern void skip_eol(void);

extern int is_whitespace(int);
extern int is_ep(int);
extern int is_sidchr(int);
extern int is_idchr(int);
extern int is_dec(int);
extern int is_hex(int);

extern int skip_level;

#endif // cpp_h_seen___