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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.

*/

%types%

/*

    TYPES

    The types are fairly self-explanitory.  Note that distinctions are

    made in the parser type system which do not exist in the underlying

    program.

*/

BOOLEAN ;

COMMAND ;

COMMAND_KEY ;

IDENTIFIER ;

STRING ;

SUBSET_KEY ;

TYPE ;

TYPE_KEY ;

TYPE_LIST ;

TYPE_QUAL ;

TYPE_SPEC ;

VERSION ;

%terminals%

/*

    TERMINALS

    The terminals are arranged in five groups; the names and strings, the

    commands (beginning with '+'), the types, the special macro names

    (beginning with '~'), and the punctuators and operators.

*/

name : () -> ( :STRING ) ;

number : () -> ( :STRING ) ;

string : () -> ( :STRING ) ;

variable : () -> ( :STRING ) ;

comment : () -> ( :STRING ) ;

insert : () -> ( :STRING ) ;

build-insert : () -> ( :STRING ) ;

base-api ; constant ; define ; else ; endif ; enumerate ; exp ;

field ; func ; if ; ifdef ; ifndef ; implement ; info ; macro ; nat ;

set ; statement ; !subset ; token ; type ; typedef ; use ;

arith ; char ; const ; double ; enum ; extern ; float ; int ; long ;

lvalue ; scalar ; short ; signed ; struct ; union ; unsigned ; void ;

volatile ; weak ;

building ; promote ; protect ; special ;

open-brace ; close-brace ; open-round ; close-round ; open-square ;

close-square ; assign ; colon ; comma ; dot ; !dot-dot ; ellipsis ;

equal ; exclaim ; minus ; or ; question ; semicolon ; star ; eof ;

!unknown ;

%productions%

/*

    BUILT-IN TYPES

    These rules describe the built-in types.  Illegal combinations of

    keywords are detected by the action <type_builtin>.

*/

<btype_char> : () -> ( :TYPE_SPEC ) ;

<btype_short> : () -> ( :TYPE_SPEC ) ;

<btype_int> : () -> ( :TYPE_SPEC ) ;

<btype_long> : () -> ( :TYPE_SPEC ) ;

<btype_signed> : () -> ( :TYPE_SPEC ) ;

<btype_unsigned> : () -> ( :TYPE_SPEC ) ;

<btype_float> : () -> ( :TYPE_SPEC ) ;

<btype_double> : () -> ( :TYPE_SPEC ) ;

<btype_void> : () -> ( :TYPE_SPEC ) ;

<btype_join> : ( :TYPE_SPEC, :TYPE_SPEC ) -> ( :TYPE_SPEC ) ;

type-keyword : () -> ( b : TYPE_SPEC ) = {

	char ; b = <btype_char> ;

    ||	short ; b = <btype_short> ;

    ||	int ; b = <btype_int> ;

    ||	long ; b = <btype_long> ;

    ||	signed ; b = <btype_signed> ;

    ||	unsigned ; b = <btype_unsigned> ;

    ||	float ; b = <btype_float> ;

    ||	double ; b = <btype_double> ;

    ||	void ; b = <btype_void> ;

} ;

builtin-type : () -> ( b : TYPE_SPEC ) = {

	a = type-keyword ;

	{

		d = builtin-type ; c = <btype_join> ( a, d ) ;

	    ||	c = a ;

	} ;

	b = c ;

} ;

/*

    SIMPLE TYPES

    These rules describes the simple, unqualified, types.

*/

<type_builtin> : ( :TYPE_SPEC ) -> ( :TYPE ) ;

<type_name> : ( :STRING, :TYPE_KEY ) -> ( :TYPE ) ;

<key_type> : () -> ( :TYPE_KEY ) ;

<key_struct_tag> : () -> ( :TYPE_KEY ) ;

<key_union_tag> : () -> ( :TYPE_KEY ) ;

<key_enum_tag> : () -> ( :TYPE_KEY ) ;

type-key : () -> ( tag : TYPE_KEY ) = {

	tag = <key_type> ;

    ||	struct ; tag = <key_struct_tag> ;

    ||	union ; tag = <key_union_tag> ;

    ||	enum ; tag = <key_enum_tag> ;

} ;

simple-type : () -> ( t : TYPE ) = {

	b = builtin-type ;

	t = <type_builtin> ( b ) ;

    ||

	tag = type-key ; nm = name ;

	t = <type_name> ( nm, tag ) ;

} ;

/*

    QUALIFIED TYPES

    These rules describe the type qualifiers and the qualified types.

*/

<cv_none> : () -> ( :TYPE_QUAL ) ;

<cv_const> : ( :TYPE_QUAL ) -> ( :TYPE_QUAL ) ;

<cv_volatile> : ( :TYPE_QUAL ) -> ( :TYPE_QUAL ) ;

<type_qualify> : ( :TYPE, :TYPE_QUAL ) -> ( :TYPE ) ;

type-qualifier : () -> ( :TYPE_QUAL ) ;

type-qualifier-opt : () -> ( cv : TYPE_QUAL ) = {

	cv = <cv_none> ;

    ||	cv = type-qualifier ;

} ;

type-qualifier : () -> ( cv : TYPE_QUAL ) = {

    	const ; a = type-qualifier-opt ;

	cv = <cv_const> ( a ) ;

    ||

    	volatile ; a = type-qualifier-opt ;

	cv = <cv_volatile> ( a ) ;

} ;

qualified-type : () -> ( t : TYPE ) = {

	t = simple-type ;

    ||

	cv = type-qualifier ; s = simple-type ;

	t = <type_qualify> ( s, cv ) ;

    ||

	s = simple-type ; cv = type-qualifier ;

	t = <type_qualify> ( s, cv ) ;

} ;

/*

    LVALUE QUALIFIERS

    This rule describes the lvalue and rvalue type qualifiers.

*/

<key_rvalue> : () -> ( :TYPE_KEY ) ;

<key_lvalue> : () -> ( :TYPE_KEY ) ;

object-qualifier : () -> ( lv : TYPE_KEY ) = {

	lvalue ; lv = <key_lvalue> ;

    ||	lv = <key_rvalue> ;

} ;

/*

    CONSTANT EXPRESSIONS

    This rule describes the constant expressions.  These comprise the

    numbers, the NAT token names, plus some simple operations on these

    values.  More complex expressions can be expressed using an insert.

*/

<value_none> : () -> ( :STRING ) ;

<value_nat> : ( :STRING ) -> ( :STRING ) ;

<value_not> : ( :STRING ) -> ( :STRING ) ;

<value_negate> : ( :STRING ) -> ( :STRING ) ;

constant-value : () -> ( s : STRING ) = {

	s = number ;

    ||	s = insert ;

    ||	a = name ; s = <value_nat> ( a ) ;

    ||  minus ; a = constant-value ; s = <value_negate> ( a ) ;

    ||  exclaim ; a = constant-value ; s = <value_not> ( a ) ;

} ;

/*

    POINTER TYPE OPERATOR

    This rule describes the pointer type operator.

*/

<type_ptr> : ( :TYPE_QUAL ) -> ( :TYPE ) ;

ptr-operator : () -> ( t : TYPE ) = {

	star ; cv = type-qualifier-opt ;

	t = <type_ptr> ( cv ) ;

} ;

/*

    ARRAY TYPE OPERATOR

    This rule describes the array type operator.

*/

<type_array> : ( :STRING ) -> ( :TYPE ) ;

array-operator : () -> ( t : TYPE ) = {

	open-square ;

	{

		a = constant-value ;

	    ||	a = <value_none> ;

	} ;

	close-square ;

	t = <type_array> ( a ) ;

} ;

/*

    BITFIELD TYPE OPERATOR

    This rule describes the bitfield type operator.

*/

<type_bitfield> : ( :STRING ) -> ( :TYPE ) ;

bitfield-operator : () -> ( t : TYPE ) = {

	colon ; a = constant-value ;

	t = <type_bitfield> ( a ) ;

} ;

/*

    FUNCTION TYPE OPERATOR

    These rules describe the function type operator.

*/

<type_func> : ( :TYPE_LIST ) -> ( :TYPE ) ;

<type_inject> : ( :TYPE, :TYPE ) -> ( :TYPE ) ;

<type_list_none> : () -> ( :TYPE_LIST ) ;

<type_list_empty> : () -> ( :TYPE_LIST ) ;

<type_list_ellipsis> : () -> ( :TYPE_LIST ) ;

<type_list_cons> : ( :TYPE, :TYPE_LIST ) -> ( :TYPE_LIST ) ;

<param_name> : ( :STRING ) -> () ;

abstract-declarator : () -> ( :STRING, :TYPE ) ;

parameter-declaration : () -> ( t : TYPE ) = {

	s = qualified-type ; ( nm, p ) = abstract-declarator ;

	t = <type_inject> ( p, s ) ;

	<param_name> ( nm ) ;

} ;

parameter-list : () -> ( p : TYPE_LIST ) = {

	t = parameter-declaration ;

	{

		comma ; q = parameter-list ;

	    ||	comma ; ellipsis ; q = <type_list_ellipsis> ;

	    ||	q = <type_list_none> ;

	} ;

	p = <type_list_cons> ( t, q ) ;

} ;

function-operator : () -> ( t : TYPE ) = {

	open-round ; p = parameter-list ; close-round ;

	t = <type_func> ( p ) ;

    ||

	open-round ; close-round ;

	p = <type_list_empty> ;

	t = <type_func> ( p ) ;

} ;

/*

    MACRO TYPE OPERATOR

    These rules describe the macro type operator.  This is similar to the

    function type operator except that each parameter may be specified

    as an lvalue and there are no ellipsis parameters.

*/

<type_lvalue> : ( :TYPE, :TYPE_KEY ) -> ( :TYPE ) ;

<type_macro> : ( :TYPE_LIST ) -> ( :TYPE ) ;

macro-param-declaration : () -> ( t : TYPE ) = {

	lv = object-qualifier ;

	s = qualified-type ; ( nm, p ) = abstract-declarator ;

	u = <type_inject> ( p, s ) ;

	t = <type_lvalue> ( u, lv ) ;

	<param_name> ( nm ) ;

} ;

macro-param-list : () -> ( p : TYPE_LIST ) = {

	t = macro-param-declaration ;

	{

		comma ; q = macro-param-list ;

	    ||	q = <type_list_none> ;

	} ;

	p = <type_list_cons> ( t, q ) ;

} ;

macro-operator : () -> ( t : TYPE ) = {

	open-round ; p = macro-param-list ; close-round ;

	t = <type_macro> ( p ) ;

    ||

	open-round ; close-round ;

	p = <type_list_none> ;

	t = <type_macro> ( p ) ;

} ;

/*

    MACRO DEFINITION PARAMETER LISTS

    These rules describe the macro definition parameter lists.  These

    comprise a simple list of identifier names.

*/

<param_none> : () -> ( :STRING ) ;

<param_empty> : () -> ( :STRING ) ;

<param_join> : ( :STRING, :STRING ) -> ( :STRING ) ;

define-param-list : () -> ( p : STRING ) = {

	n = name ; comma ; q = define-param-list ;

	p = <param_join> ( n, q ) ;

    ||

	p = name ;

} ;

define-param-clause : () -> ( p : STRING ) = {

	open-round ; p = define-param-list ; close-round ;

    ||	open-round ; close-round ; p = <param_empty> ;

    ||	p = <param_none> ;

} ;

/*

    OBJECT DECLARATORS

    These rules describe the object declarators.  These consist of an

    identifier qualified using pointer, array and function type

    operators.

*/

<type_none> : () -> ( :TYPE ) ;

declarator : () -> ( :IDENTIFIER, :TYPE ) ;

identifier : () -> ( :IDENTIFIER ) ;

direct-declarator : () -> ( id : IDENTIFIER, t : TYPE ) = {

	id = identifier ; t = <type_none> ;

    ||

	( id, p ) = direct-declarator ; s = function-operator ;

	t = <type_inject> ( p, s ) ;

    ||

	( id, p ) = direct-declarator ; s = array-operator ;

	t = <type_inject> ( p, s ) ;

    ||

	open-round ; ( id, t ) = declarator ; close-round ;

} ;

declarator : () -> ( id : IDENTIFIER, t : TYPE ) = {

	( id, t ) = direct-declarator ;

    ||

	p = ptr-operator ; ( id, s ) = declarator ;

	t = <type_inject> ( s, p ) ;

} ;

/*

    MACRO DECLARATORS

    These rules describe the macro declarators.  These are a restricted

    subset of the declarators in which only pointer operators are allowed.

*/

macro-declarator : () -> ( id : IDENTIFIER, t : TYPE ) = {

	id = identifier ; t = <type_none> ;

    ||

	p = ptr-operator ; ( id, s ) = macro-declarator ;

	t = <type_inject> ( s, p ) ;

} ;

/*

    ABSTRACT DECLARATORS

    These rules describe the abstract declarators, as used in function

    parameter declarations.  For simplicity, the case of a list of

    function parameters without a declarator has been omitted; function

    parameters should be pointers to functions, rather than functions,

    anyway.

*/

<name_none> : () -> ( :STRING ) ;

direct-abstract-declarator : () -> ( nm : STRING, t : TYPE ) = {

	nm = <name_none> ; t = <type_none> ;

    ||

	nm = name ; t = <type_none> ;

    ||

	( nm, p ) = direct-abstract-declarator ; s = array-operator ;

	t = <type_inject> ( p, s ) ;

    ||

	open-round ; ( nm, t ) = abstract-declarator ; close-round ;

    ||

	open-round ; ( nm, p ) = abstract-declarator ; close-round ;

	s = function-operator ;

	t = <type_inject> ( p, s ) ;

} ;

abstract-declarator : () -> ( nm : STRING, t : TYPE ) = {

	( nm, t ) = direct-abstract-declarator ;

    ||

	p = ptr-operator ; ( nm, s ) = abstract-declarator ;

	t = <type_inject> ( s, p ) ;

} ;

/*

    IDENTIFIER NAMES

    These rules describe the identifier names.  These comprise the actual

    internal name, plus an optional external name (the external and internal

    names are equal if this is not given).  Either name may have an

    associated version number.

*/

<field_name> : ( :STRING ) -> ( :STRING ) ;

<token_name> : ( :STRING ) -> ( :STRING ) ;

<version_none> : () -> ( :VERSION ) ;

<version_number> : ( :STRING ) -> ( :VERSION ) ;

<make_id> : ( :STRING, :VERSION, :STRING, :VERSION ) -> ( :IDENTIFIER ) ;

name-version : () -> ( v : VERSION ) = {

	dot ; n = number ; v = <version_number> ( n ) ;

    ||	v = <version_none> ;

} ;

internal-name : () -> ( nm : STRING, v : VERSION ) = {

	a = name ; v = name-version ;

	nm = <field_name> ( a ) ;

} ;

external-name : () -> ( nm : STRING, v : VERSION ) = {

	a = name ; v = name-version ;

	b = <field_name> ( a ) ;

	nm = <token_name> ( b ) ;

    ||

	nm = string ; v = name-version ;

} ;

identifier : () -> ( id : IDENTIFIER ) = {

	( nm, v ) = internal-name ;

	tnm = <token_name> ( nm ) ;

	id = <make_id> ( nm, v, tnm, v ) ;

    ||

	( nm, v ) = internal-name ; or ; ( tnm, tv ) = external-name ;

	id = <make_id> ( nm, v, tnm, tv ) ;

} ;

/*

    SUBSET NAMES

    These rules describe the specification subset names.  These consist

    of between one and three components, giving the API name, the header

    file within that API, and the subset of that header.

*/

<cmd_implement> : () -> ( :COMMAND_KEY ) ;

<cmd_use> : () -> ( :COMMAND_KEY ) ;

<api_name> : ( :STRING ) -> ( :STRING ) ;

<file_name> : ( :STRING, :STRING ) -> ( :STRING ) ;

<subset_name> : ( :STRING, :STRING, :STRING ) -> ( :STRING ) ;

implement-command : () -> ( cmd : COMMAND_KEY ) = {

	implement ; cmd = <cmd_implement> ;

    ||	use ; cmd = <cmd_use> ;

} ;

subset-name : () -> ( s : STRING ) = {

	a = string ;

	s = <api_name> ( a ) ;

    ||

	a = string ; comma ; b = string ;

	s = <file_name> ( a, b ) ;

    ||

	a = string ; comma ; b = string ; comma ; c = string ;

	s = <subset_name> ( a, b, c ) ;

} ;

use-subset-name : () -> ( s : STRING ) = {

	open-round ; a = string ; close-round ; comma ; b = string ;

	s = <file_name> ( a, b ) ;

} ;

/*

    SUBSET USAGE KEYS

    This rule describes the subset usage keys.  These are used to indicate

    whether a file inclusion refers to the specification output, the

    library building output, or both.

*/

<subset_none> : () -> ( :SUBSET_KEY ) ;

<subset_first> : () -> ( :SUBSET_KEY ) ;

<subset_second> : () -> ( :SUBSET_KEY ) ;

<subset_both> : () -> ( :SUBSET_KEY ) ;

<subset_next> : ( :SUBSET_KEY ) -> ( :SUBSET_KEY ) ;

subset-key : () -> ( key : SUBSET_KEY ) = {

	key = <subset_both> ;

    ||

	open-round ; question ; question ; close-round ;

	key = <subset_none> ;

    ||

	open-round ; exclaim ; question ; close-round ;

	key = <subset_first> ;

    ||

	open-round ; question ; exclaim ; close-round ;

	key = <subset_second> ;

    ||

	open-round ; exclaim ; exclaim ; close-round ;

	key = <subset_both> ;

} ;

/*

    CONDITIONAL COMPILATION COMMANDS

    These rules describe the conditional compilation commands.

*/

<cond_building> : () -> ( :STRING ) ;

<cond_protect> : ( :STRING, :STRING ) -> ( :STRING ) ;

<command_if> : ( :STRING ) -> ( :COMMAND ) ;

<command_ifdef> : ( :STRING ) -> ( :COMMAND ) ;

<command_ifndef> : ( :STRING ) -> ( :COMMAND ) ;

<command_endif> : ( :COMMAND, :STRING, :COMMAND, :COMMAND ) -> ( :COMMAND ) ;

ifdef-macro-name : () -> ( c : STRING ) = {

	c = name ;

    ||

	building ;

	c = <cond_building> ;

    ||

	protect ;

	open-round ; a = string ; comma ; b = string ; close-round ;

	c = <cond_protect> ( a, b ) ;

} ;

if-command : () -> ( c : COMMAND, s : STRING ) = {

	if ; s = constant-value ;

	c = <command_if> ( s ) ;

    ||

	ifdef ; s = ifdef-macro-name ;

	c = <command_ifdef> ( s ) ;

    ||

	ifndef ; s = ifdef-macro-name ;

	c = <command_ifndef> ( s ) ;

} ;

/*

    ENUMERATION COMMANDS

    These rules describe the enumeration commands.  Each enumeration type

    consists of a list of enumerator namess, each of which may be associated

    with a value.

*/

<command_none> : () -> ( :COMMAND ) ;

<command_join> : ( :COMMAND, :COMMAND ) -> ( :COMMAND ) ;

<declare_enumerator> : ( :IDENTIFIER, :STRING ) -> ( :COMMAND ) ;

<key_enum> : () -> ( :TYPE_KEY ) ;

enum-command : () -> ( tag : TYPE_KEY ) = {

	tag = <key_enum> ;

    ||	enum ; tag = <key_enum_tag> ;

} ;

enumerator : () -> ( c : COMMAND ) = {

	id = identifier ;

	{

		equal ; s = constant-value ;

	    ||	s = <value_none> ;

	} ;

	c = <declare_enumerator> ( id, s ) ;

} ;

enumerator-list : () -> ( c : COMMAND ) = {

	a = enumerator ;

	{

		comma ; b = enumerator-list ;

	    ||	b = <command_none> ;

	} ;

	c = <command_join> ( a, b ) ;

} ;

/*

    EXPRESSION COMMANDS

    These rules describe the expression commands.  Each expression command

    consists of an lvalue specifier, a qualified type plus a list of

    declarators.

*/

<cmd_constant> : () -> ( :COMMAND_KEY ) ;

<cmd_exp> : () -> ( :COMMAND_KEY ) ;

<cmd_exp_extern> : () -> ( :COMMAND_KEY ) ;

<declare_exp> : ( :COMMAND_KEY, :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

exp-command : () -> ( cmd : COMMAND_KEY ) = {

	constant ; cmd = <cmd_constant> ;

    ||	exp ; cmd = <cmd_exp> ;

    ||	exp ; open-round ; const ; close-round ; cmd = <cmd_constant> ;

    ||	exp ; open-round ; extern ; close-round ; cmd = <cmd_exp_extern> ;

} ;

exp-declarator-list : ( cmd : COMMAND_KEY, s : TYPE, lv : TYPE_KEY )

		    -> ( c : COMMAND ) = {

	( id, p ) = declarator ;

	u = <type_inject> ( p, s ) ;

	t = <type_lvalue> ( u, lv ) ;

	a = <declare_exp> ( cmd, id, t ) ;

	{

		comma ; b = exp-declarator-list ( cmd, s, lv ) ;

	    ||	b = <command_none> ;

	} ;

	c = <command_join> ( a, b ) ;

} ;

/*

    FIELD COMMANDS

    These rules describe the field commands.  Each field consists of a

    qualified type and a list of declarators.  Conditional compilation

    of fields is allowed.

*/

<bool_true> : () -> ( :BOOLEAN ) ;

<bool_false> : () -> ( :BOOLEAN ) ;

<id_anon> : () -> ( :IDENTIFIER ) ;

<declare_field> : ( :IDENTIFIER, :TYPE, :TYPE ) -> ( :COMMAND ) ;

field-exact : () -> ( e : BOOLEAN ) = {

	assign ; e = <bool_true> ;

    ||	e = <bool_false> ;

} ;

field-declarator : () -> ( id : IDENTIFIER, t : TYPE ) = {

	( id, t ) = declarator ;

    ||

	id = identifier ; t = bitfield-operator ;

    ||

	t = bitfield-operator ; id = <id_anon> ;

} ;

field-declarator-list : ( m : TYPE, s : TYPE ) -> ( c : COMMAND ) = {

	( id, p ) = field-declarator ;

	t = <type_inject> ( p, s ) ;

	a = <declare_field> ( id, m, t ) ;

	{

		comma ; b = field-declarator-list ( m, s ) ;

	    ||	b = <command_none> ;

	} ;

	c = <command_join> ( a, b ) ;

} ;

field-list : ( m : TYPE ) -> ( c : COMMAND ) = {

	c = <command_none> ;

    ||

	t = qualified-type ;

	a = field-declarator-list ( m, t ) ; semicolon ;

	b = field-list ( m ) ;

	c = <command_join> ( a, b ) ;

    ||

	( i, s ) = if-command ;

	a = field-list ( m ) ;

	{

		else ; b = field-list ( m ) ;

	    ||	b = <command_none> ;

	} ;

	endif ;

	c1 = <command_endif> ( i, s, a, b ) ;

	c2 = field-list ( m ) ;

	c = <command_join> ( c1, c2 ) ;

} ;

/*

    FUNCTION COMMANDS

    This rule describes the various function command keys.

*/

<cmd_func> : () -> ( :COMMAND_KEY ) ;

<cmd_func_extern> : () -> ( :COMMAND_KEY ) ;

<cmd_func_weak> : () -> ( :COMMAND_KEY ) ;

func-command : () -> ( cmd : COMMAND_KEY ) = {

	func ; cmd = <cmd_func> ;

    ||

	func ; open-round ; extern ; close-round ;

	cmd = <cmd_func_extern> ;

    ||

	func ; open-round ; weak ; close-round ;

	cmd = <cmd_func_weak> ;

} ;

/*

    INTEGER CONSTANT COMMANDS

    This rule describes the integer constant commands.  This consists of

    a simple list of identifiers.

*/

<declare_nat> : ( :IDENTIFIER ) -> ( :COMMAND ) ;

nat-declarator-list : () -> ( c : COMMAND ) = {

	id = identifier ;

	a = <declare_nat> ( id ) ;

	{

		comma ; b = nat-declarator-list ;

	    ||	b = <command_none> ;

	} ;

	c = <command_join> ( a, b ) ;

} ;

/*

    TYPE COMMANDS

    These rules describe the type commands.  These comprise a list of

    identifiers, each preceeded by an optional type command key.

*/

<key_int> : () -> ( :TYPE_KEY ) ;

<key_signed> : () -> ( :TYPE_KEY ) ;

<key_unsigned> : () -> ( :TYPE_KEY ) ;

<key_float> : () -> ( :TYPE_KEY ) ;

<key_arith> : () -> ( :TYPE_KEY ) ;

<key_scalar> : () -> ( :TYPE_KEY ) ;

<key_struct> : () -> ( :TYPE_KEY ) ;

<key_union> : () -> ( :TYPE_KEY ) ;

<declare_type> : ( :TYPE_KEY, :IDENTIFIER ) -> ( :COMMAND ) ;

type-command : () -> ( tag : TYPE_KEY ) = {

	tag = <key_type> ;

    ||	open-round ; int ; close-round ; tag = <key_int> ;

    ||	open-round ; signed ; close-round ; tag = <key_signed> ;

    ||	open-round ; unsigned ; close-round ; tag = <key_unsigned> ;

    ||	open-round ; float ; close-round ; tag = <key_float> ;

    ||	open-round ; arith ; close-round ; tag = <key_arith> ;

    ||	open-round ; scalar ; close-round ; tag = <key_scalar> ;

    ||	open-round ; struct ; close-round ; tag = <key_struct> ;

    ||	open-round ; union ; close-round ; tag = <key_union> ;

    ||	struct ; tag = <key_struct_tag> ;

    ||	union ; tag = <key_union_tag> ;

} ;

type-declarator-list : () -> ( c : COMMAND ) = {

	tag = type-command ; id = identifier ;

	a = <declare_type> ( tag, id ) ;

	{

		comma ; b = type-declarator-list ;

	    ||	b = <command_none> ;

	} ;

	c = <command_join> ( a, b ) ;

} ;

/*

    SUBSET COMMAND

    These rules describes the subset command.  This is the main entry point

    into the grammar.

*/

<begin_subset> : ( :STRING ) -> ( :COMMAND ) ;

<end_subset> : ( :COMMAND, :COMMAND ) -> ( :COMMAND ) ;

<syntax_error> : () -> () ;

command-list : () -> ( :COMMAND ) ;

subset-command : () -> ( c : COMMAND ) = {

	set ; s = subset-name ; assign ;

	a = <begin_subset> ( s ) ;

	open-brace ; b = command-list ; close-brace ;

	c = <end_subset> ( a, b ) ;

} ;

specification : () -> ( c : COMMAND ) = {

	c = subset-command ;

	semicolon ; eof ;

    ##

	<syntax_error> ;

	c = <command_none> ;

} ;

/*

    SPECIFICATION COMMANDS

    This rule describes the main group of commands; those which introduce

    a specification item.

*/

<declare_base> : () -> ( :COMMAND ) ;

<declare_define> : ( :IDENTIFIER, :STRING, :STRING ) -> ( :COMMAND ) ;

<declare_enum> : ( :TYPE_KEY, :IDENTIFIER, :COMMAND ) -> ( :COMMAND ) ;

<declare_func> : ( :COMMAND_KEY, :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

<declare_macro> : ( :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

<declare_promote> : ( :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

<declare_stmt> : ( :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

<declare_token> : ( :IDENTIFIER, :STRING ) -> ( :COMMAND ) ;

<declare_typedef> : ( :IDENTIFIER, :TYPE ) -> ( :COMMAND ) ;

<include_subset> : ( :COMMAND_KEY, :STRING, :SUBSET_KEY ) -> ( :COMMAND ) ;

<begin_field> : ( :IDENTIFIER, :TYPE_KEY ) -> ( :TYPE, :COMMAND ) ;

<end_field> : ( :TYPE, :COMMAND, :COMMAND, :BOOLEAN ) -> ( :COMMAND ) ;

<type_special> : ( :STRING ) -> ( :TYPE ) ;

<key_exp> : ( :COMMAND_KEY, :TYPE_KEY ) -> ( :TYPE_KEY ) ;

spec-command : () -> ( c : COMMAND ) = {

	base-api ;

	c = <declare_base> ;

    ||

	define ; id = identifier ; p = define-param-clause ;

	s = constant-value ;

	c = <declare_define> ( id, p, s ) ;

    ||

	enumerate ; tag = enum-command ; id = identifier ; assign ;

	open-brace ; e = enumerator-list ; close-brace ;

	c = <declare_enum> ( tag, id, e ) ;

    ||

	cmd = exp-command ; lv1 = object-qualifier ;

	lv = <key_exp> ( cmd, lv1 ) ;

	t = qualified-type ;

	c = exp-declarator-list ( cmd, t, lv ) ;

    ||

	field ; tag = type-command ; id = identifier ; e = field-exact ;

	( t, a ) = <begin_field> ( id, tag ) ;

	open-brace ; b = field-list ( t ) ; close-brace ;

	c = <end_field> ( t, a, b, e ) ;

    ||

	cmd = func-command ; s = qualified-type ;

	( id, p ) = declarator ;

	t = <type_inject> ( p, s ) ;

	c = <declare_func> ( cmd, id, t ) ;

    ||

	macro ; lv = object-qualifier ;

	s = qualified-type ;

	( id, p ) = macro-declarator ;

	u = <type_inject> ( p, s ) ;

	v = <type_lvalue> ( u, lv ) ;

	{

		q = macro-operator ;

	    ||	q = <type_none> ;

	} ;

	t = <type_inject> ( q, v ) ;

	c = <declare_macro> ( id, t ) ;

    ||

	nat ; c = nat-declarator-list ;

    ||

	statement ; id = identifier ;

	{

		t = macro-operator ;

	    ||	t = <type_none> ;

	} ;

	c = <declare_stmt> ( id, t ) ;

    ||

	token ; id = identifier ; s = insert ;

	c = <declare_token> ( id, s ) ;

    ||

	type ; c = type-declarator-list ;

    ||

	typedef ;

	s = qualified-type ; ( id, p ) = declarator ;

	t = <type_inject> ( p, s ) ;

	c = <declare_typedef> ( id, t ) ;

    ||

	typedef ;

	promote ; open-round ; t = qualified-type ; close-round ;

	id = identifier ;

	c = <declare_promote> ( id, t ) ;

    ||

	typedef ;

	special ; open-round ; s = string ; close-round ;

	t = <type_special> ( s ) ;

	id = identifier ;

	c = <declare_typedef> ( id, t ) ;

    ||

	cmd = implement-command ;

	s = subset-name ; key = subset-key ;

	c = <include_subset> ( cmd, s, key ) ;

    ||

	use ; cmd = <cmd_use> ;

	s = use-subset-name ; key1 = subset-key ;

	key = <subset_next> ( key1 ) ;

	c = <include_subset> ( cmd, s, key ) ;

    ||

	c = subset-command ;

} ;

/*

    TEXTUAL COMMANDS

    This rule describes the second group of commands; those which are

    concerned with textual substitution.

*/

<declare_comment> : ( :STRING ) -> ( :COMMAND ) ;

<declare_insert> : ( :STRING ) -> ( :COMMAND ) ;

<declare_build_insert> : ( :STRING ) -> ( :COMMAND ) ;

text-command : () -> ( c : COMMAND ) = {

	( i, s ) = if-command ;

	a = command-list ;

	{

		else ; b = command-list ;

	    ||	b = <command_none> ;

	} ;

	endif ;

	c = <command_endif> ( i, s, a, b ) ;

    ||

	s = comment ;

	c = <declare_comment> ( s ) ;

    ||

	s = insert ;

	c = <declare_insert> ( s ) ;

    ||

	s = build-insert ;

	c = <declare_build_insert> ( s ) ;

} ;

/*

    VARIABLE COMMANDS

    This rule describes the third group of commands; those which affect the

    program environment, but do not actually introduce a specified item.

*/

<variable_string> : ( :STRING, :STRING ) -> () ;

<variable_plus> : ( :STRING, :STRING ) -> () ;

<variable_minus> : ( :STRING, :STRING ) -> () ;

variable-command : () -> () = {

	info ; s = string ;

    ||

	nm = variable ; equal ; s = string ;

	<variable_string> ( nm, s ) ;

    ||

	nm = variable ; equal ; s = number ;

	<variable_plus> ( nm, s ) ;

    ||