/*
   * 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 <assert.h>

  #include <stdio.h>
  #ifndef __cplusplus
  #include <stdbool.h>
  #endif
  
  struct file {
  	struct file *next;
  	struct file *parent;

  	const char *name;

  	int lineno;

  };

  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 dir_dep;

  	struct expr_value rev_dep;
  };

  #define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; 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		9973

  /* 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 */

  	P_SYMBOL,   /* where a symbol is defined */

  };
  
  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 *visibility;

  	struct expr *dep;
  	unsigned int flags;

  	char *help;

  	struct file *file;
  	int lineno;
  	void *data;
  };
  
  #define MENU_CHANGED		0x0001
  #define MENU_ROOT		0x0002

  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(const 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);

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

  
  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);
  }

  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* EXPR_H */