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/*
 * libtu/tokenizer.h
 *
 * Copyright (c) Tuomo Valkonen 1999-2000.
 * 
 * This file is distributed under the terms of the "Artistic License".
 * See the included file LICENSE for details.
 */

#ifndef __LIBTU_TOKENIZER_H
#define __LIBTU_TOKENIZER_H

#include <stdio.h>
#include "types.h"


#define TOK_SET_LONG(TOK, VAL) 		{(TOK)->type=TOK_LONG; (TOK)->u.lval=VAL;}
#define TOK_SET_DOUBLE(TOK, VAL) 	{(TOK)->type=TOK_DOUBLE; (TOK)->u.dval=VAL;}
#define TOK_SET_CHAR(TOK, VAL) 		{(TOK)->type=TOK_CHAR; (TOK)->u.cval=VAL;}
#define TOK_SET_STRING(TOK, VAL) 	{(TOK)->type=TOK_STRING; (TOK)->u.sval=VAL;}
#define TOK_SET_IDENT(TOK, VAL) 	{(TOK)->type=TOK_IDENT; (TOK)->u.sval=VAL;}
#define TOK_SET_COMMENT(TOK, VAL) 	{(TOK)->type=TOK_COMMENT; (TOK)->u.sval=VAL;}
#define TOK_SET_OP(TOK, VAL) 		{(TOK)->type=TOK_OP; (TOK)->u.opval=VAL;}

#define TOK_TYPE(TOK)				((TOK)->type)
#define TOK_LONG_VAL(TOK)			((TOK)->u.lval)
#define TOK_DOUBLE_VAL(TOK)			((TOK)->u.dval)
#define TOK_CHAR_VAL(TOK)			((TOK)->u.cval)
#define TOK_STRING_VAL(TOK)			((TOK)->u.sval)
#define TOK_IDENT_VAL(TOK)			((TOK)->u.sval)
#define TOK_COMMENT_VAL(TOK)		((TOK)->u.sval)
#define TOK_OP_VAL(TOK)				((TOK)->u.opval)

#define TOK_IS_INVALID(TOK)			((TOK)->type==TOK_INVALID)
#define TOK_IS_LONG(TOK)			((TOK)->type==TOK_LONG)
#define TOK_IS_DOUBLE(TOK)			((TOK)->type==TOK_DOUBLE)
#define TOK_IS_CHAR(TOK)			((TOK)->type==TOK_CHAR)
#define TOK_IS_STRING(TOK)			((TOK)->type==TOK_STRING)
#define TOK_IS_IDENT(TOK)			((TOK)->type==TOK_IDENT)
#define TOK_IS_COMMENT(TOK)			((TOK)->type==TOK_COMMENT)
#define TOK_IS_OP(TOK)				((TOK)->type==TOK_OP)

#define TOK_OP_IS(TOK, OP)			((TOK)->type==TOK_OP && (TOK)->u.opval==(OP))

#define TOK_TAKE_STRING_VAL(TOK)	((TOK)->type=TOK_INVALID, (TOK)->u.sval)
#define TOK_TAKE_IDENT_VAL(TOK)		((TOK)->type=TOK_INVALID, (TOK)->u.sval)
#define TOK_TAKE_COMMENT_VAL(TOK)	((TOK)->type=TOK_INVALID, (TOK)->u.sval)


enum{
	TOK_INVALID=0,
	TOK_LONG,
	TOK_DOUBLE,
	TOK_CHAR,
	TOK_STRING,
	TOK_IDENT,
	TOK_COMMENT,
	TOK_OP
};


enum{
#define OP2(X,Y)   ((X)|((Y)<<8))
#define OP3(X,Y,Z) ((X)|((Y)<<8)|((Z)<<16))

	OP_L_PAR=	'(', OP_R_PAR=	')', OP_L_BRK=	'[', OP_R_BRK=	']',
	OP_L_BRC=	'{', OP_R_BRC=	'}', OP_COMMA=	',', OP_SCOLON=	';',

	OP_PLUS=	'+', OP_MINUS=	'-', OP_MUL=	'*', OP_DIV=	'/',
	OP_MOD=		'%', OP_POW=	'^', OP_OR= 	'|', OP_AND=	'&',
	/*OP_NOT=	'~',*/ OP_NOT=	'!', OP_ASGN=	'=', OP_LT=		'<',
	OP_GT=		'>', OP_DOT=	'.', OP_COLON=	':', OP_QMARK=	'?',
	OP_AT=		'@',
	OP_NEXTLINE='\n',OP_EOF=	-1,
	
	OP_INC=		OP2('+','+'),		 OP_DEC=	OP2('-','-'),
	OP_LSHIFT=	OP2('<','<'), 		 OP_RSHIFT=	OP2('>','>'),
	OP_AS_INC=	OP2('+','='), 		 OP_AS_DEC= OP2('-','='),
	OP_AS_MUL=	OP2('*','='), 		 OP_AS_DIV= OP2('/','='),
	OP_AS_MOD=	OP2('%','='), 		 OP_AS_POW= OP2('^','='),

/*	AS_OR=		OP2('|','='),		 AS_AND=	OP2('&','='), */
	OP_EQ=		OP2('=','='), 		 OP_NE=		OP2('!','='),
	OP_LE=		OP2('<','='), 		 OP_GE=		OP2('>','=')
	
/*	L_AND=		OP2('&','&'), L_OR=		OP2('|','|'),
	L_XOR=		OP2('^','^'), */

/*	AsLShift=	OP3('<','<','='),
	AsRShift=	OP3('>','>','='), */
		
#undef OP2
#undef OP3
};


typedef struct{
	int type;
	int line;
	union{
		long lval;
		double dval;
		char cval;
		char *sval;
		int opval;
	} u;
} Token;

#define TOK_INIT {0, 0, {0}}


extern void tok_free(Token*tok);
extern void tok_init(Token*tok);


/* */


enum{
	TOKZ_IGNORE_NEXTLINE=0x1,
	TOKZ_READ_COMMENTS=0x2,
	TOKZ_PARSER_INDENT_MODE=0x04,
	TOKZ_ERROR_TOLERANT=0x8
};


enum{
	E_TOKZ_UNEXPECTED_EOF=1,
	E_TOKZ_UNEXPECTED_EOL,
	E_TOKZ_EOL_EXPECTED,
	E_TOKZ_INVALID_CHAR,
	E_TOKZ_TOOBIG,
	E_TOKZ_NUMFMT,
	E_TOKZ_NUM_JUNK,
	E_TOKZ_NOTINT,
	E_TOKZ_RANGE,
	E_TOKZ_MULTICHAR,
	
	E_TOKZ_TOKEN_LIMIT,
	E_TOKZ_UNKNOWN_OPTION,
	E_TOKZ_SYNTAX,
	E_TOKZ_INVALID_ARGUMENT,
	E_TOKZ_EOS_EXPECTED,
	E_TOKZ_TOO_FEW_ARGS,
	E_TOKZ_TOO_MANY_ARGS,
	E_TOKZ_MAX_NEST,
	E_TOKZ_IDENTIFIER_EXPECTED,
	
	E_TOKZ_LBRACE_EXPECTED
};


struct _ConfOpt;

typedef struct _Tokenizer_FInfo{
	FILE *file;
	char *name;
	int line;
	int ungetc;
	Token ungettok;
} Tokenizer_FInfo;

typedef struct _Tokenizer{
	FILE *file;
	char *name;
	int line;
	int ungetc;
	Token ungettok;
	
	int flags;
	const struct _ConfOpt **optstack;
	int nest_lvl;
	void *user_data;

	int filestack_n;
	Tokenizer_FInfo *filestack;
} Tokenizer;


extern Tokenizer *tokz_open(const char *fname);
extern Tokenizer *tokz_open_file(FILE *file);
extern void tokz_close(Tokenizer *tokz);
extern bool tokz_get_token(Tokenizer *tokz, Token *tok);
extern void tokz_unget_token(Tokenizer *tokz, Token *tok);
extern void tokz_warn_error(const Tokenizer *tokz, int line, int e);

extern bool tokz_pushf(Tokenizer *tokz, const char *fname);
extern bool tokz_pushf_file(Tokenizer *tokz, FILE *file);
extern bool tokz_popf(Tokenizer *tokz);

#endif /* __LIBTU_TOKENIZER_H */