/*
 * 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 */
