/* SCHEME.H */
#ifndef _SCHEME_H
#define _SCHEME_H

#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef SBPL_DEBUG
#define SBPL_DEBUG 0
#endif

/*
 * Default values for #define'd symbols
 */
#ifndef STANDALONE /* If used as standalone interpreter */
#define STANDALONE 0
#endif

#ifndef _MSC_VER
#define USE_STRCASECMP 1
#ifndef USE_STRLWR
#define USE_STRLWR 1
#endif
#define SCHEME_EXPORT
#else
#define USE_STRCASECMP 0
#define USE_STRLWR 0
#ifdef _SCHEME_SOURCE
#define SCHEME_EXPORT __declspec(dllexport)
#else
#define SCHEME_EXPORT __declspec(dllimport)
#endif
#endif

#if USE_NO_FEATURES
#define USE_MATH 0
#define USE_CHAR_CLASSIFIERS 0
#define USE_ASCII_NAMES 0
#define USE_STRING_PORTS 0
#define USE_ERROR_HOOK 0
#define USE_TRACING 0
#define USE_COLON_HOOK 0
#define USE_DL 0
#define USE_PLIST 0
#endif

/*
 * Leave it defined if you want continuations, and also for the Sharp Zaurus.
 * Undefine it if you only care about faster speed and not strict Scheme
 * compatibility.
 */
#define USE_SCHEME_STACK

#if USE_DL
#define USE_INTERFACE 1
#endif

#ifndef USE_MATH /* If math support is needed */
#define USE_MATH 1
#endif

#ifndef USE_CHAR_CLASSIFIERS /* If char classifiers are needed */
#define USE_CHAR_CLASSIFIERS 1
#endif

#ifndef USE_ASCII_NAMES /* If extended escaped characters are needed */
#define USE_ASCII_NAMES 1
#endif

#ifndef USE_STRING_PORTS /* Enable string ports */
#define USE_STRING_PORTS 1
#endif

#ifndef USE_TRACING
#define USE_TRACING 1
#endif

#ifndef USE_PLIST
#define USE_PLIST 0
#endif

/* To force system errors through user-defined error handling (see *error-hook*)
 */
#ifndef USE_ERROR_HOOK
#define USE_ERROR_HOOK 1
#endif

#ifndef USE_COLON_HOOK /* Enable qualified qualifier */
#define USE_COLON_HOOK 1
#endif

#ifndef USE_STRCASECMP /* stricmp for Unix */
#define USE_STRCASECMP 0
#endif

#ifndef USE_STRLWR
#define USE_STRLWR 1
#endif

#ifndef STDIO_ADDS_CR /* Define if DOS/Windows */
#define STDIO_ADDS_CR 0
#endif

#ifndef INLINE
#define INLINE
#endif

#ifndef USE_INTERFACE
#define USE_INTERFACE 0
#endif

typedef struct scheme scheme;
typedef struct cell *pointer;

typedef void *(*func_alloc)(size_t);
typedef void (*func_dealloc)(void *);

/* num, for generic arithmetic */
typedef struct num {
  char is_fixnum;
  union {
    long ivalue;
    double rvalue;
  } value;
} num;

SCHEME_EXPORT scheme *scheme_init_new();
SCHEME_EXPORT scheme *scheme_init_new_custom_alloc(func_alloc malloc,
                                                   func_dealloc free);
SCHEME_EXPORT int scheme_init(scheme *sc);
SCHEME_EXPORT int scheme_init_custom_alloc(scheme *sc, func_alloc,
                                           func_dealloc);
SCHEME_EXPORT void scheme_deinit(scheme *sc);
void scheme_set_input_port_file(scheme *sc, FILE *fin);
void scheme_set_input_port_string(scheme *sc, char *start, char *past_the_end);
SCHEME_EXPORT void scheme_set_output_port_file(scheme *sc, FILE *fin);
void scheme_set_output_port_string(scheme *sc, char *start, char *past_the_end);
SCHEME_EXPORT void scheme_load_file(scheme *sc, FILE *fin);
SCHEME_EXPORT void scheme_load_string(scheme *sc, const char *cmd);
void scheme_apply0(scheme *sc, const char *procname);
SCHEME_EXPORT pointer scheme_apply1(scheme *sc, const char *procname, pointer);
void scheme_set_external_data(scheme *sc, void *p);
SCHEME_EXPORT void scheme_define(scheme *sc, pointer env, pointer symbol,
                                 pointer value);

typedef pointer (*foreign_func)(scheme *, pointer);

pointer _cons(scheme *sc, pointer a, pointer b, int immutable);
pointer mk_integer(scheme *sc, long num);
pointer mk_real(scheme *sc, double num);
pointer mk_symbol(scheme *sc, const char *name);
pointer gensym(scheme *sc);
pointer mk_string(scheme *sc, const char *str);
pointer mk_counted_string(scheme *sc, const char *str, int len);
pointer mk_character(scheme *sc, int c);
pointer mk_foreign_func(scheme *sc, foreign_func f);
void putstr(scheme *sc, const char *s);

// Custom struct to save arbitrary data in cell structure.
typedef void (*blob_free_func)(void *, size_t);
typedef struct {
  size_t tag;
  void *blob;
  size_t size;
  blob_free_func blob_free;
} blob_info_t;

pointer mk_blob(scheme *sc, size_t tag, void *blob, size_t size,
                blob_free_func blob_free);

#if USE_INTERFACE
struct scheme_interface {
  void (*scheme_define)(scheme *sc, pointer env, pointer symbol, pointer value);
  pointer (*cons)(scheme *sc, pointer a, pointer b);
  pointer (*immutable_cons)(scheme *sc, pointer a, pointer b);
  pointer (*reserve_cells)(scheme *sc, int n);
  pointer (*mk_integer)(scheme *sc, long num);
  pointer (*mk_real)(scheme *sc, double num);
  pointer (*mk_symbol)(scheme *sc, const char *name);
  pointer (*gensym)(scheme *sc);
  pointer (*mk_string)(scheme *sc, const char *str);
  pointer (*mk_counted_string)(scheme *sc, const char *str, int len);
  pointer (*mk_character)(scheme *sc, int c);
  pointer (*mk_vector)(scheme *sc, int len);
  pointer (*mk_foreign_func)(scheme *sc, foreign_func f);
  pointer (*mk_blob)(scheme *sc, size_t tag, void *blob, size_t size,
                     blob_free_func blob_free);
  void (*putstr)(scheme *sc, const char *s);
  void (*putcharacter)(scheme *sc, int c);

  int (*is_string)(pointer p);
  char *(*string_value)(pointer p);
  int (*is_number)(pointer p);
  num (*nvalue)(pointer p);
  long (*ivalue)(pointer p);
  double (*rvalue)(pointer p);
  int (*is_integer)(pointer p);
  int (*is_real)(pointer p);
  int (*is_character)(pointer p);
  long (*charvalue)(pointer p);
  int (*is_vector)(pointer p);
  long (*vector_length)(pointer vec);
  void (*fill_vector)(pointer vec, pointer elem);
  pointer (*vector_elem)(pointer vec, int ielem);
  pointer (*set_vector_elem)(pointer vec, int ielem, pointer newel);
  int (*is_port)(pointer p);

  int (*is_pair)(pointer p);
  pointer (*pair_car)(pointer p);
  pointer (*pair_cdr)(pointer p);
  pointer (*set_car)(pointer p, pointer q);
  pointer (*set_cdr)(pointer p, pointer q);

  int (*is_symbol)(pointer p);
  char *(*symname)(pointer p);

  int (*is_syntax)(pointer p);
  int (*is_proc)(pointer p);
  int (*is_foreign)(pointer p);
  int (*is_blob)(pointer p);
  blob_info_t (*blob_info)(pointer p);
  char *(*syntaxname)(pointer p);
  int (*is_closure)(pointer p);
  int (*is_macro)(pointer p);
  pointer (*closure_code)(pointer p);
  pointer (*closure_env)(pointer p);

  int (*is_continuation)(pointer p);
  int (*is_promise)(pointer p);
  int (*is_environment)(pointer p);
  int (*is_immutable)(pointer p);
  void (*setimmutable)(pointer p);
  void (*load_file)(scheme *sc, FILE *fin);
  void (*load_string)(scheme *sc, const char *input);
};
#endif

#if defined(__cplusplus)
}
#endif

#endif
