source: MondoRescue/branches/stable/mindi-busybox/scripts/config/expr.h@ 821

/*
 * 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
#define FILE_PRINTED        0x0004

typedef enum tristate {
    no, mod, yes
} tristate;

enum expr_type {
    E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_CHOICE, 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 E_OR(dep1, dep2)    (((dep1)>(dep2))?(dep1):(dep2))
#define E_AND(dep1, dep2)   (((dep1)<(dep2))?(dep1):(dep2))
#define E_NOT(dep)      (2-(dep))

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
};

struct symbol {
    struct symbol *next;
    char *name;
    char *help;
    enum symbol_type type;
    struct symbol_value curr, user;
    tristate visible;
    int flags;
    struct property *prop;
    struct expr *dep, *dep2;
    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_YES      0x0001
#define SYMBOL_MOD      0x0002
#define SYMBOL_NO       0x0004
#define SYMBOL_CONST        0x0007
#define SYMBOL_CHECK        0x0008
#define SYMBOL_CHOICE       0x0010
#define SYMBOL_CHOICEVAL    0x0020
#define SYMBOL_PRINTED      0x0040
#define SYMBOL_VALID        0x0080
#define SYMBOL_OPTIONAL     0x0100
#define SYMBOL_WRITE        0x0200
#define SYMBOL_CHANGED      0x0400
#define SYMBOL_NEW      0x0800
#define SYMBOL_AUTO     0x1000
#define SYMBOL_CHECKED      0x2000
#define SYMBOL_CHECK_DONE   0x4000
#define SYMBOL_WARNED       0x8000

#define SYMBOL_MAXLENGTH    256
#define SYMBOL_HASHSIZE     257
#define SYMBOL_HASHMASK     0xff

enum prop_type {
    P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE, P_SELECT, P_RANGE
};

struct property {
    struct property *next;
    struct symbol *sym;
    enum prop_type type;
    const char *text;
    struct expr_value visible;
    struct expr *expr;
    struct menu *menu;
    struct file *file;
    int lineno;
};

#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 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 */