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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.

*/

#include "config.h"

#include "types.h"

#include "help.h"

#include "high.h"

#include "table.h"

#include "tdf.h"

#include "utility.h"

/*

    HASHING FUNCTION

    This routine is used to construct the hash tables.  It takes a

    string s and returns a value in the range 0 <= n < hash_size.

*/

static int hash

    PROTO_N ( ( s ) )

    PROTO_T ( char *s )

{

    int n = 0 ;

    for ( ; *s ; s++ ) n += *s ;

    return ( n % hash_size ) ;

}

/*

    CONSTRUCT TABLES

    There are a number of tables of constructs.  cons_table is the

    table of all built-in constructs (arranged by sort and encoding),

    and var_table of all user defined constructs.  The tables

    cons_hash_tables and var_hash_tables give the corresponding

    hash tables (arranged by sort).  The table cons_sizes gives

    the number of built-in constructs of each sort.

*/

construct **var_table ;

construct **cons_table ;

static int *cons_sizes ;

construct **cons_hash_tables ;

static construct **var_hash_tables ;

/*

    SORT INFORMATION TABLES

    These tables give information on the various sorts, namely, the

    number of them created, their decode letters, the number of bits

    in their encoding, the encoding of their "apply_token" construct,

    and the number of them removed from the hash tables.

*/

long *sort_count ;

char *sort_letters ;

int *sort_encoding ;

int *sort_extension ;

long *sort_tokens ;

long *sort_conds ;

long *sort_removed ;

decode_func *sort_decode ;

read_func *sort_read ;

/*

    CREATE A TABLE FOR A NEW SORT

    A table of sz constructs of sort s is created and cleared.

*/

void new_sort

    PROTO_N ( ( s, sz ) ) 

    PROTO_T ( sortname s X int sz )

{

    int i ;

    construct *p = alloc_nof ( construct, sz ) ;

    for ( i = 0 ; i < sz ; i++ ) {

	( p + i )->sortnum = s ;

	( p + i )->encoding = i ;

	( p + i )->name = null ;

	( p + i )->next = null ;

	get_char_info ( p + i ) = null ;

    }

    cons_table [s] = p ;

    cons_sizes [s] = ( int ) sz ;

    return ;

}

/*

    PUT A NAME INTO A CONSTRUCT

    The nth construct of sort s is set to have name nm and argument

    string args.

*/

void new_cons

    PROTO_N ( ( nm, s, n, args ) )

    PROTO_T ( char *nm X sortname s X int n X char *args )

{

    construct *p = cons_no ( s, n ) ;

    p->name = nm ;

    if ( add_to_cons_hash ( p, s ) ) {

	fatal_error ( "Construct %s already defined", nm ) ;

    }

    get_char_info ( p ) = args ;

    return ;

}

/*

    DUMMY DECODING FUNCTION

    This routine is a dummy which is used for uninitialised decode functions.

*/

static node *de_dummy

    PROTO_Z ()

{

    fatal_error ( "Invalid decode function" ) ;

    return ( null ) ;

}

/*

    DUMMY READING FUNCTION

    This routine is a dummy which is used for uninitialised read functions.

*/

static node *read_dummy

    PROTO_N ( ( n ) )

    PROTO_T ( long n )

{

    fatal_error ( "Invalid read function" ) ;

    UNUSED ( n ) ;

    return ( null ) ;

}

/*

    INITIALIZE CONSTRUCT TABLES

    The various construct and sort tables are initialized.

*/

void init_tables

    PROTO_Z ()

{

    int i ;

    /* Allocate tables */

    cons_table = alloc_nof ( construct *, SORT_no ) ;

    cons_sizes = alloc_nof ( int, SORT_no ) ;

    cons_hash_tables = alloc_nof ( construct *, SORT_no * hash_size ) ;

    var_table = alloc_nof ( construct *, SORT_no ) ;

    var_hash_tables = alloc_nof ( construct *, SORT_no * hash_size ) ;

    sort_count = alloc_nof ( long, SORT_no ) ;

    sort_letters = alloc_nof ( char, SORT_no + 1 ) ;

    sort_encoding = alloc_nof ( int, SORT_no ) ;

    sort_extension = alloc_nof ( int, SORT_no ) ;

    sort_tokens = alloc_nof ( long, SORT_no ) ;

    sort_conds = alloc_nof ( long, SORT_no ) ;

    sort_removed = alloc_nof ( long, SORT_no ) ;

    sort_decode = alloc_nof ( decode_func, SORT_no ) ;

    sort_read = alloc_nof ( read_func, SORT_no ) ;

    /* Clear out tables */

    for ( i = 0 ; i < SORT_no ; i++ ) {

	cons_table [i] = null ;

	cons_sizes [i] = 0 ;

	var_table [i] = null ;

	sort_count [i] = 0 ;

	sort_letters [i] = 'F' ;

	sort_encoding [i] = 0 ;

	sort_extension [i] = 0 ;

	sort_tokens [i] = -2 ;

	sort_conds [i] = -2 ;

	sort_removed [i] = 0 ;

	sort_decode [i] = de_dummy ;

	sort_read [i] = read_dummy ;

    }

    sort_letters [ SORT_no ] = 0 ;

    /* Initialize construct hash tables */

    for ( i = 0 ; i < SORT_no * hash_size ; i++ ) {

	cons_hash_tables [i] = null ;

	var_hash_tables [i] = null ;

    }

    return ;

}

/*

    SPECIAL CONSTRUCTS

    These constructs are predefined.

*/

construct bytestream_cons = { SORT_bytestream, 0, null, null, null } ;

construct false_cons = { SORT_tdfbool, 0, null, null, null } ;

construct optional_cons = { SORT_option, 0, null, null, null } ;

construct string_cons = { SORT_tdfstring, -1, null, null, null } ;

construct token_cons = { SORT_token, 0, null, null, null } ;

construct true_cons = { SORT_tdfbool, 1, null, null, null } ;

construct unknown_cons = { SORT_unknown, 0, "....", null, null } ;

construct exp_shape = { SORT_exp, 0, "~exp_with_shape", null, null } ;

construct shape_of = { SORT_shape, -1, "~shape_of", null, null } ;

/*

    OUTPUT OPTIONS

    These flags give information on the form of the output.

*/

boolean show_tokdecs = 1 ;

boolean show_tokdefs = 1 ;

boolean show_aldecs = 1 ;

boolean show_aldefs = 1 ;

boolean show_tagdecs = 1 ;

boolean show_tagdefs = 1 ;

/*

    FIND THE NAME OF A GIVEN SORT

    Given the sort s, this routine returns the name of s.

*/

char *sort_name

    PROTO_N ( ( s ) )

    PROTO_T ( sortname s )

{

    if ( is_high ( s ) ) {

	high_sort *h = high_sorts + high_no ( s ) ;

	return ( h->name ) ;

    } else if ( s == SORT_unknown || s < 0 ) {

	return ( "...." ) ;

    } else {

	construct *p = cons_no ( SORT_sortname, s ) ;

	return ( p->name ) ;

    }

}

/*

    ADD A NAME TO A CONSTRUCT HASH TABLE

    The construct p of sort s is added to the built-in construct hash

    table.  The routine returns a pointer to any existing entry of

    the same name, or null otherwise.

*/

construct *add_to_cons_hash

    PROTO_N ( ( p, s ) )

    PROTO_T ( construct *p X sortname s )

{

    construct *q ;

    int n = hash ( p->name ) ;

    construct *h = cons_hash_tables [ hash_size * s + n ] ;

    for ( q = h ; q != null ; q = q->next ) {

	if ( streq ( p->name, q->name ) ) return ( q ) ;

    }

    p->next = h ;

    cons_hash_tables [ hash_size * s + n ] = p ;

    return ( null ) ;

}

/*

    LOOK UP A NAME IN A CONSTRUCT HASH TABLE

    A construct with name p and sort s is looked up in the built-in

    construct hash table.  The routine returns a pointer to the

    construct if it is found, or null otherwise.

*/

construct *search_cons_hash

    PROTO_N ( ( p, s ) )

    PROTO_T ( char *p X sortname s )

{

    construct *q ;

    int n = hash ( p ) ;

    construct *h = cons_hash_tables [ hash_size * s + n ] ;

    for ( q = h ; q != null ; q = q->next ) {

	if ( streq ( p, q->name ) ) return ( q ) ;

    }

    return ( null ) ;

}

/*

    ADD A NAME TO A VARIABLE HASH TABLE

    The construct p of sort s is added to the user-defined construct

    hash table.  The routine returns a pointer to any existing entry

    of the same name, or null otherwise.

*/

construct *add_to_var_hash

    PROTO_N ( ( p, s ) )

    PROTO_T ( construct *p X sortname s )

{

    construct *q ;

    int n = hash ( p->name ) ;

    construct *h = var_hash_tables [ hash_size * s + n ] ;

    for ( q = h ; q != null ; q = q->next ) {

	if ( streq ( p->name, q->name ) ) return ( q ) ;

    }

    p->next = h ;

    var_hash_tables [ hash_size * s + n ] = p ;

    return ( null ) ;

}

/*

    LOOK UP A NAME IN A VARIABLE HASH TABLE

    A construct with name p and sort s is looked up in the user-defined

    construct hash table.  The routine returns a pointer to the construct

    if it is found, or null otherwise.

*/

construct *search_var_hash

    PROTO_N ( ( p, s ) )

    PROTO_T ( char *p X sortname s )

{

    construct *q ;

    int n = hash ( p ) ;

    construct *h = var_hash_tables [ hash_size * s + n ] ;

    for ( q = h ; q != null ; q = q->next ) {

	if ( streq ( p, q->name ) ) return ( q ) ;

    }

    return ( null ) ;

}

/*

    LIST OF ALL REMOVED CONSTRUCTS

    All constructs removed from the user-defined construct hash table

    are formed into a list.  This is used in node.c to form the

    completion of a node.

*/

construct *removals = null ;

/*

    REMOVE A NAME FROM A VARIABLE HASH TABLE

    The construct with name p and sort s is removed from the

    user-defined hash table and added to the removals list.  There

    is no error if the construct does not exist.

*/

void remove_var_hash

    PROTO_N ( ( p, s ) )

    PROTO_T ( char *p X sortname s )

{

    int n = hash ( p ) ;

    construct *h = var_hash_tables [ hash_size * s + n ] ;

    if ( h == null ) return ;

    if ( streq ( p, h->name ) ) {

	/* It is the first element */

	var_hash_tables [ hash_size * s + n ] = h->next ;

	h->next = removals ;

	removals = h ;

	( sort_removed [s] )++ ;

	return ;

    }

    while ( h->next ) {

	if ( streq ( p, h->next->name ) ) {

	    /* It is a subsequent element */

	    construct *q = h->next->next ;

	    h->next->next = removals ;

	    removals = h->next ;

	    h->next = q ;

	    ( sort_removed [s] )++ ;

	    return ;

	}

	h = h->next ;

    }

    /* Not found */

    return ;

}

/*

    SORT A HASH TABLE

    The constructs of sort s in the hash table tab are sorted into

    alphabetical order.  They are formed into a list where the

    constructs with hash value 0 should be.  After sorting the hash

    table cannot be used.

*/

void sort_table

    PROTO_N ( ( tab, s ) )

    PROTO_T ( construct **tab X sortname s )

{

    int i ;

    construct *q = null ;

    for ( i = 0 ; i < hash_size ; i++ ) {

	construct *p = tab [ hash_size * s + i ] ;

	tab [ hash_size * s + i ] = null ;

	while ( p ) {

	    construct *p_next = p->next ;

	    construct *r_last = null, *r = q ;

	    p->next = null ;

	    while ( r && strcmp ( r->name, p->name ) < 0 ) {

		r_last = r ;

		r = r->next ;

	    }

	    if ( r_last == null ) {

		p->next = q ;

		q = p ;

	    } else {

		r_last->next = p ;

		p->next = r ;

	    }

	    p = p_next ;

	}

    }

    tab [ hash_size * s ] = q ;

    return ;

}

/*

    FLAG

    This flag may be set to false to prevent sort_all sorting its

    tables.

*/

boolean order_names = 1 ;

/*

    SORTING ROUTINE

    The user-defined alignment tags, tags and tokens are sorted into

    alphabetical order.

*/

void sort_all

    PROTO_Z ()

{

    if ( order_names ) {

	sort_table ( var_hash_tables, SORT_al_tag ) ;

	sort_table ( var_hash_tables, SORT_tag ) ;

	sort_table ( var_hash_tables, SORT_token ) ;

    }

    return ;

}

/*

    APPLY A PROCEDURE TO ALL CONSTRUCTS

    The routine f is applied to all user-defined constructs of sort s

    by scanning across the hash table.

*/

void apply_to_all

    PROTO_N ( ( f, s ) )

    PROTO_T ( apply_func f X sortname s )

{

    int i ;

    for ( i = 0 ; i < hash_size ; i++ ) {

	construct *p = var_hash_tables [ hash_size * s + i ] ;

	while ( p ) {

	    construct *q = p->next ;

	    ( *f ) ( p ) ;

	    p = q ;

	}

    }

    return ;

}