/*

 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>

 * Released under the terms of the GNU GPL v2.0.

 */

#ifndef EXPR_H

#define EXPR_H

#ifdef __cplusplus

extern "C" {

#endif

#include <stdio.h>

#ifndef __cplusplus

#include <stdbool.h>

#endif

struct file {

	struct file *next;

	struct file *parent;

	char *name;

	int lineno;

	int flags;

};

#define FILE_BUSY		0x0001

#define FILE_SCANNED		0x0002

typedef enum tristate {

	no, mod, yes

} tristate;

enum expr_type {

	E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE

};

union expr_data {

	struct expr *expr;

	struct symbol *sym;

};

struct expr {

	enum expr_type type;

	union expr_data left, right;

};

#define EXPR_OR(dep1, dep2)	(((dep1)>(dep2))?(dep1):(dep2))

#define EXPR_AND(dep1, dep2)	(((dep1)<(dep2))?(dep1):(dep2))

#define EXPR_NOT(dep)		(2-(dep))

#define expr_list_for_each_sym(l, e, s) \

	for (e = (l); e && (s = e->right.sym); e = e->left.expr)

struct expr_value {

	struct expr *expr;

	tristate tri;

};

struct symbol_value {

	void *val;

	tristate tri;

};

enum symbol_type {

	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER

};

/* enum values are used as index to symbol.def[] */

enum {

	S_DEF_USER,		/* main user value */

	S_DEF_AUTO,		/* values read from auto.conf */

	S_DEF_DEF3,		/* Reserved for UI usage */

	S_DEF_DEF4,		/* Reserved for UI usage */

	S_DEF_COUNT

};

struct symbol {

	struct symbol *next;

	char *name;

	enum symbol_type type;

	struct symbol_value curr;

	struct symbol_value def[S_DEF_COUNT];

	tristate visible;

	int flags;

	struct property *prop;

	struct expr_value rev_dep;

};

#define for_all_symbols(i, sym) for (i = 0; i < 257; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)

#define SYMBOL_CONST      0x0001  /* symbol is const */

#define SYMBOL_CHECK      0x0008  /* used during dependency checking */

#define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */

#define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */

#define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */

#define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */

#define SYMBOL_WRITE      0x0200  /* ? */

#define SYMBOL_CHANGED    0x0400  /* ? */

#define SYMBOL_AUTO       0x1000  /* value from environment variable */

#define SYMBOL_CHECKED    0x2000  /* used during dependency checking */

#define SYMBOL_WARNED     0x8000  /* warning has been issued */

/* Set when symbol.def[] is used */

#define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */

#define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */

#define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */

#define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */

#define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */

#define SYMBOL_MAXLENGTH	256

#define SYMBOL_HASHSIZE		257

#define SYMBOL_HASHMASK		0xff

/* A property represent the config options that can be associated

 * with a config "symbol".

 * Sample:

 * config FOO

 *         default y

 *         prompt "foo prompt"

 *         select BAR

 * config BAZ

 *         int "BAZ Value"

 *         range 1..255

 */

enum prop_type {

	P_UNKNOWN,

	P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */

	P_COMMENT,  /* text associated with a comment */

	P_MENU,     /* prompt associated with a menuconfig option */

	P_DEFAULT,  /* default y */

	P_CHOICE,   /* choice value */

	P_SELECT,   /* select BAR */

	P_RANGE,    /* range 7..100 (for a symbol) */

	P_ENV,      /* value from environment variable */

};

struct property {

	struct property *next;     /* next property - null if last */

	struct symbol *sym;        /* the symbol for which the property is associated */

	enum prop_type type;       /* type of property */

	const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */

	struct expr_value visible;

	struct expr *expr;         /* the optional conditional part of the property */

	struct menu *menu;         /* the menu the property are associated with

	                            * valid for: P_SELECT, P_RANGE, P_CHOICE,

	                            * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */

	struct file *file;         /* what file was this property defined */

	int lineno;                /* what lineno was this property defined */

};

#define for_all_properties(sym, st, tok) \

	for (st = sym->prop; st; st = st->next) \

		if (st->type == (tok))

#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)

#define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)

#define for_all_prompts(sym, st) \

	for (st = sym->prop; st; st = st->next) \

		if (st->text)

struct menu {

	struct menu *next;

	struct menu *parent;

	struct menu *list;

	struct symbol *sym;

	struct property *prompt;

	struct expr *dep;

	unsigned int flags;

	char *help;

	struct file *file;

	int lineno;

	void *data;

};

#define MENU_CHANGED		0x0001

#define MENU_ROOT		0x0002

#ifndef SWIG

extern struct file *file_list;

extern struct file *current_file;

struct file *lookup_file(const char *name);

extern struct symbol symbol_yes, symbol_no, symbol_mod;

extern struct symbol *modules_sym;

extern struct symbol *sym_defconfig_list;

extern int cdebug;

struct expr *expr_alloc_symbol(struct symbol *sym);

struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);

struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);

struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);

struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);

struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);

struct expr *expr_copy(struct expr *org);

void expr_free(struct expr *e);

int expr_eq(struct expr *e1, struct expr *e2);

void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);

tristate expr_calc_value(struct expr *e);

struct expr *expr_eliminate_yn(struct expr *e);

struct expr *expr_trans_bool(struct expr *e);

struct expr *expr_eliminate_dups(struct expr *e);

struct expr *expr_transform(struct expr *e);

int expr_contains_symbol(struct expr *dep, struct symbol *sym);

bool expr_depends_symbol(struct expr *dep, struct symbol *sym);

struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);

struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);

void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);

struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);

void expr_fprint(struct expr *e, FILE *out);

struct gstr; /* forward */

void expr_gstr_print(struct expr *e, struct gstr *gs);

static inline int expr_is_yes(struct expr *e)

{

	return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);

}

static inline int expr_is_no(struct expr *e)

{

	return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);

}

#endif

#ifdef __cplusplus

}

#endif

#endif /* EXPR_H */