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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#ifndef TYPES_INCLUDED

#define TYPES_INCLUDED

/*

    ELEMENTARY TYPES

    A byte is used to represent a single 8-bit number read from the

    input file.  A pointer is a generic pointer.

*/

typedef unsigned char byte ;

#if FS_PTR_VOID

typedef void *pointer ;

#else

typedef char *pointer ;

#endif

/*

    INPUT FILE POSITION

    A place is used to record positions in the input file.  It consists

    of the byte number within the file, the bit number within that byte,

    and an 8-bit input buffer.

*/

typedef struct {

    long byte ;

    int bit ;

    unsigned worksp ;

} place ;

/*

    IDENTIFIER TYPES

    A string is used to represent TDF strings.  A unique is a null-terminated

    array of strings.  An external is either a string or a unique.

*/

typedef char *string ;

typedef string *unique ;

typedef struct {

    char simple ;

    union {

	string str ;

	unique uniq ;

    } val ;

} external ;

/*

    TYPES REPRESENTING SORTS

    Each TDF sort name is represented by an identifying integer.  A sort

    identifier consists of a name and a decode letter.  A foreign sort may

    also have an associated foreign sort name.

*/

typedef int sortname ;

typedef struct {

    char *name ;

    char *fname ;

    char decode ;

    sortname res ;

    char *args ;

} sortid ;

/*

    TYPE REPRESENTING TOKEN INFORMATION

    A token is represented by a structure giving the result sort,

    the argument sorts (if any) in the form of a decode string, and the

    implicit sort (for tokens which are used before they are declared

    or defined).

*/

typedef struct {

    sortname tok_res_sort ;

    char *tok_arg_sorts ;

    sortname tok_implicit_sort ;

} token_info ;

/*

    TYPE REPRESENTING VARIABLE SORTS

    All variable sorts, in particular tags and tokens, are represented

    by the same data structure.  This gives its external name (if any),

    its internal identifying number, plus extra information depending

    on the type of object represented (see below).

*/

typedef struct object_tag {

    int flag ;

    int named ;

    external name ;

    long id ;

    long order ;

    union {

	token_info tok ;

    } extra ;

    struct object_tag *aux ;

} object ;

/*

    TRANSLATIONS FOR TAGS

    These macros give the interpretation for the field of an object

    when that object represents a tag.

*/

#define var( X )		( ( X )->flag )

/*

    TRANSLATIONS FOR TOKENS

    These macros give the interpretation for the field of an object

    when that object represents a token.

*/

#define is_foreign( X )		( ( X )->flag )

#define res_sort( X )		( ( X )->extra.tok.tok_res_sort )

#define arg_sorts( X )		( ( X )->extra.tok.tok_arg_sorts )

#define implicit_sort( X )	( ( X )->extra.tok.tok_implicit_sort )

/*

    TYPE REPRESENTING BINDINGS

    A binding consists of a table of pointers to objects.  A binding table

    is an array of bindings.

*/

typedef struct {

    long max_no ;

    long sz ;

    object **table ;

} binding ;

#endif