types.h

#ifndef TYPES_H
#define TYPES_H
/*
 * types.h - 
 *
 * All types and functions declared in this header file begin with "Ty_"
 * Linked list types end with "..list"
 */

typedef struct Ty_ty_ *Ty_ty;
typedef struct Ty_tyList_ *Ty_tyList;
typedef struct Ty_field_ *Ty_field;
typedef struct Ty_fieldList_ *Ty_fieldList;

struct Ty_ty_ 
{
	enum {Ty_record, Ty_nil, Ty_int, Ty_string, Ty_array,
		  Ty_name, Ty_void} kind;
	
	union {
		Ty_fieldList record;
		Ty_ty array;
		struct {S_symbol sym; Ty_ty ty;} name;
	} u;
};

struct Ty_tyList_ {Ty_ty head; Ty_tyList tail;};
struct Ty_field_ {S_symbol name; Ty_ty ty;};
struct Ty_fieldList_ {Ty_field head; Ty_fieldList tail;};

Ty_ty Ty_Nil(void);
Ty_ty Ty_Int(void);
Ty_ty Ty_String(void);
Ty_ty Ty_Void(void);

Ty_ty Ty_Record(Ty_fieldList fields);
Ty_ty Ty_Array(Ty_ty ty);
Ty_ty Ty_Name(S_symbol sym, Ty_ty ty);

Ty_tyList Ty_TyList(Ty_ty head, Ty_tyList tail);
Ty_field Ty_Field(S_symbol name, Ty_ty ty);
Ty_fieldList Ty_FieldList(Ty_field head, Ty_fieldList tail);

void Ty_print(Ty_ty t);
void TyList_print(Ty_tyList list);
#endif