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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 "calculus.h"

#include "check.h"

#include "common.h"

#include "error.h"

#include "output.h"

#include "type_ops.h"

#include "xalloc.h"

/*

    LIST OF ALL NAMES

    This variable contains a list of all the names defined within the algebra.

*/

static NAME *all_names = NULL ;

/*

    ARRAY OF NAME ERRORS

    This array gives all the errors associated with the various name types.

*/

static char *name_error [] = {

    "Type name %s",

    "Auxilliary type name %s",

    "Enumeration constant %s.%s",

    "Structure component %s.%s",

    "Union component %s.%s",

    "Union field component %s.%s.%s",

    "Union map %s.%s",

    "Union map argument %s.%s"

} ;

/*

    LOOK UP A NAME

    This routine looks up the name with type n and components a, b and c in

    the list of all names.

*/

static NAME *find_name

    PROTO_N ( ( n, a, b, c ) )

    PROTO_T ( int n X char *a X char *b X char *c )

{

    NAME *p ;

    for ( p = all_names ; p != NULL ; p = p->next ) {

	if ( p->type == n && streq ( p->text [0], a ) &&

	     streq ( p->text [1], b ) && streq ( p->text [2], c ) ) {

	    return ( p ) ; ;

	}

    }

    return ( NULL ) ;

}

/*

    CREATE A NAME

    This routine adds the name with type n and components a, b and c to the

    list of all names.

*/

static void make_name

    PROTO_N ( ( n, a, b, c ) )

    PROTO_T ( int n X char *a X char *b X char *c )

{

    static int names_left = 0 ;

    static NAME *names_free = NULL ;

    NAME *p = find_name ( n, a, b, c ) ;

    if ( p ) {

	char buffer [1000] ;

	sprintf_v ( buffer, name_error [n], a, b, c ) ;

	error ( ERROR_SERIOUS, "%s already defined (at %s, line %d)",

		buffer, p->file, p->line ) ;

	return ;

    }

    if ( names_left == 0 ) {

	names_left = 1000 ;

	names_free = xmalloc_nof ( NAME, names_left ) ;

    }

    p = names_free + ( --names_left ) ;

    p->type = n ;

    p->text [0] = a ;

    p->text [1] = b ;

    p->text [2] = c ;

    p->file = crt_file_name ;

    p->line = crt_line_no ;

    p->next = all_names ;

    all_names = p ;

    return ;

}

/*

    EXTRACT NAMES FROM AN IDENTIFIER

    This routine assigns the names from the identifier id into na and nb.

    It also sets the current file position to the location of id.

*/

static void split_id

    PROTO_N ( ( id, na, nb ) )

    PROTO_T ( CLASS_ID_P id X char **na X char **nb )

{

    *na = DEREF_string ( cid_name ( id ) ) ;

    *nb = DEREF_string ( cid_name_aux ( id ) ) ;

    crt_file_name = DEREF_string ( cid_file ( id ) ) ;

    crt_line_no = DEREF_int ( cid_line ( id ) ) ;

    return ;

}

/*

    CHECK FOR NAME CLASHES

    This routine scans through the entire algebra definition checking for

    name clashes.  Type names are only checked if c is true.

*/

void check_names

    PROTO_N ( ( c ) )

    PROTO_T ( int c )

{

    CLASS_ID_P id ;

    char *na, *nb ;

    char *empty = "" ;

    int line = crt_line_no ;

    CONST char *file = crt_file_name ;

    all_names = NULL ;

    LOOP_PRIMITIVE {

	id = DEREF_ptr ( prim_id ( CRT_PRIMITIVE ) ) ;

	split_id ( id, &na, &nb ) ;

	if ( c ) make_name ( NAME_TYPE, na, empty, empty ) ;

	make_name ( NAME_TYPE_AUX, nb, empty, empty ) ;

    }

    LOOP_IDENTITY {

	id = DEREF_ptr ( ident_id ( CRT_IDENTITY ) ) ;

	split_id ( id, &na, &nb ) ;

	if ( c ) make_name ( NAME_TYPE, na, empty, empty ) ;

	make_name ( NAME_TYPE_AUX, nb, empty, empty ) ;

    }

    LOOP_ENUM {

	id = DEREF_ptr ( en_id ( CRT_ENUM ) ) ;

	split_id ( id, &na, &nb ) ;

	if ( c ) make_name ( NAME_TYPE, na, empty, empty ) ;

	make_name ( NAME_TYPE_AUX, nb, empty, empty ) ;

	LOOP_ENUM_CONST {

	    char *ne = DEREF_string ( ec_name ( CRT_ECONST ) ) ;

	    make_name ( NAME_ENUM_CONST, na, ne, empty ) ;

	}

    }

    LOOP_STRUCTURE {

	id = DEREF_ptr ( str_id ( CRT_STRUCTURE ) ) ;

	split_id ( id, &na, &nb ) ;

	if ( c ) make_name ( NAME_TYPE, na, empty, empty ) ;

	make_name ( NAME_TYPE_AUX, nb, empty, empty ) ;

	LOOP_STRUCTURE_COMPONENT {

	    char *nc = DEREF_string ( cmp_name ( CRT_COMPONENT ) ) ;

	    make_name ( NAME_STRUCT_CMP, na, nc, empty ) ;

	}

    }

    LOOP_UNION {

	id = DEREF_ptr ( un_id ( CRT_UNION ) ) ;

	split_id ( id, &na, &nb ) ;

	if ( c ) make_name ( NAME_TYPE, na, empty, empty ) ;

	make_name ( NAME_TYPE_AUX, nb, empty, empty ) ;

	LOOP_UNION_COMPONENT {

	    char *nc = DEREF_string ( cmp_name ( CRT_COMPONENT ) ) ;

	    make_name ( NAME_UNION_CMP, na, nc, empty ) ;

	}

	LOOP_UNION_FIELD {

	    char *nf = DEREF_string ( fld_name ( CRT_FIELD ) ) ;

	    make_name ( NAME_UNION_CMP, na, nf, empty ) ;

	    LOOP_FIELD_COMPONENT {

		char *nc = DEREF_string ( cmp_name ( CRT_COMPONENT ) ) ;

		make_name ( NAME_FIELD_CMP, na, nf, nc ) ;

	    }

	}

	LOOP_UNION_MAP {

	    char *nm = DEREF_string ( map_name ( CRT_MAP ) ) ;

	    make_name ( NAME_MAP, na, nm, empty ) ;

	    LOOP_MAP_ARGUMENT {

		char *np = DEREF_string ( arg_name ( CRT_ARGUMENT ) ) ;

		make_name ( NAME_MAP_ARG, na, nm, np ) ;

	    }

	}

    }

    crt_file_name = file ;

    crt_line_no = line ;

    return ;

}