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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.

*/

/**** rename-file.c --- Routines for parsing rename file.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 **** Commentary:

 *

 * This file provides the routines that parse the rename file.  The rename

 * file has the following format.

 *

 *	'shape'

 *		"name1" "name2";

 *		"name3" [unique.4];

 *

 * Where shape names are enclosed in single quotes, string names are enclosed

 * in double quotes, and uniques are written using the normal unique syntax.

 * A single shape name may be followed by any number of name pairs, each of

 * which is terminated by a semi-colon.

 *

 **** Change Log:

 * $Log: rename-file.c,v $

 * Revision 1.1.1.1  1998/01/17  15:57:16  release

 * First version to be checked into rolling release.

 *

 * Revision 1.3  1995/09/22  08:37:15  smf

 * Fixed problems with incomplete structures (to shut "tcc" up).

 *

 * Revision 1.2  1994/12/12  11:44:10  smf

 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with

 * OSSG C Coding Standards.

 *

 * Revision 1.1.1.1  1994/07/25  16:03:28  smf

 * Initial import of TDF linker 3.5 non shared files.

 *

**/

/****************************************************************************/

#include "rename-file.h"

#include "dstring.h"

#include "gen-errors.h"

#include "istream.h"

#include "nstring-list.h"

#include "syntax.h"

#include "solve-cycles.h"

/*--------------------------------------------------------------------------*/

#ifdef FS_NO_ENUM

typedef int RenameTagT, *RenameTagP;

#define RTOK_SHAPE		(0)

#define RTOK_NAME		(1)

#define RTOK_SEMI		(2)

#define RTOK_EOF		(3)

#else

typedef enum {

    RTOK_SHAPE,

    RTOK_NAME,

    RTOK_SEMI,

    RTOK_EOF

} RenameTagT, *RenameTagP;

#endif /* defined (FS_NO_ENUM) */

typedef struct RenameTokenT {

    RenameTagT			tag;

    union {

	NStringT		shape;

	NameKeyT		name;

    } u;

} RenameTokenT, *RenameTokenP;

/*--------------------------------------------------------------------------*/

static BoolT

rename_file_skip_white_space PROTO_N ((istream, c_ref))

			     PROTO_T (IStreamP istream X

				      char    *c_ref)

{

    BoolT comment = FALSE;

    for (;;) {

	char c;

      redo:

	switch (c = ISTREAM_READ_CHAR (istream)) {

	  case '\0':

	    ISTREAM_HANDLE_NULL (istream, redo, eof);

	    break;

	  case '\n':

	    istream_inc_line (istream);

	    comment = FALSE;

	    break;

	  case '#':

	    comment = TRUE;

	    break;

	  default:

	    if ((!comment) && (!syntax_is_white_space (c))) {

		*c_ref = c;

		return (TRUE);

	    }

	    break;

	}

    }

  eof:

    return (FALSE);

}

static void

rename_file_read_unique PROTO_N ((istream, token))

			PROTO_T (IStreamP     istream X

				 RenameTokenP token)

{

    NameKeyP          name   = &(token->u.name);

    unsigned          length = 1;

    DStringT          dstring;

    NStringT          nstring;

    NStringListT      list;

    NStringListEntryP entry;

    unsigned          i;

    dstring_init (&dstring);

    nstring_list_init (&list);

    for (;;) {

	char c;

      redo:

	switch (c = ISTREAM_READ_CHAR (istream)) {

	  case '\0':

	    ISTREAM_HANDLE_NULL (istream, redo, eof);

	    dstring_append_char (&dstring, '\0');

	    break;

	  case '\n':

	    istream_inc_line (istream);

	    E_rename_unexpected_newline (istream);

	    break;

	  case ']':

	    dstring_to_nstring (&dstring, &nstring);

	    nstring_list_append (&list, &nstring);

	    dstring_destroy (&dstring);

	    name_key_init_unique (name, length);

 	    for (i = 0, entry = nstring_list_head (&list); entry;

		 i ++, entry = nstring_list_entry_deallocate (entry)) {

		NStringP component = nstring_list_entry_string (entry);

		name_key_set_component (name, i, component);

	    }

	    token->tag = RTOK_NAME;

	    return;

	  case '[':

	    E_rename_illegal_char (istream, c);

	    break;

	  case '.':

	    dstring_to_nstring (&dstring, &nstring);

	    nstring_list_append (&list, &nstring);

	    dstring_destroy (&dstring);

	    dstring_init (&dstring);

	    length ++;

	    break;

	  case '\\':

	    switch (istream_read_escaped_char (istream, &c)) EXHAUSTIVE {

	      case ISTREAM_STAT_READ_CHAR:

		dstring_append_char (&dstring, c);

		break;

	      case ISTREAM_STAT_SYNTAX_ERROR:

		E_rename_illegal_escape (istream);

		break;

	      case ISTREAM_STAT_NO_CHAR:

		/*NOTHING*/

		break;

	    }

	    break;

	  default:

	    dstring_append_char (&dstring, c);

	    break;

	}

    }

  eof:

    E_rename_unexpected_eof (istream);

    dstring_destroy (&dstring);

    for (entry = nstring_list_head (&list); entry;

	 entry = nstring_list_entry_deallocate (entry)) {

	nstring_destroy (nstring_list_entry_string (entry));

    }

    token->tag = RTOK_EOF;

}

static void

rename_file_read_shape PROTO_N ((istream, token))

		       PROTO_T (IStreamP     istream X

				RenameTokenP token)

{

    DStringT dstring;

    dstring_init (&dstring);

    for (;;) {

	char c;

      redo:

	switch (c = ISTREAM_READ_CHAR (istream)) {

	  case '\0':

	    ISTREAM_HANDLE_NULL (istream, redo, eof);

	    dstring_append_char (&dstring, '\0');

	    break;

	  case '\n':

	    istream_inc_line (istream);

	    E_rename_unexpected_newline (istream);

	    break;

	  case '\'':

	    dstring_to_nstring (&dstring, &(token->u.shape));

	    dstring_destroy (&dstring);

	    token->tag = RTOK_SHAPE;

	    return;

	  case '\\':

	    switch (istream_read_escaped_char (istream, &c)) EXHAUSTIVE {

	      case ISTREAM_STAT_READ_CHAR:

		dstring_append_char (&dstring, c);

		break;

	      case ISTREAM_STAT_SYNTAX_ERROR:

		E_rename_illegal_escape (istream);

		break;

	      case ISTREAM_STAT_NO_CHAR:

		/*NOTHING*/

		break;

	    }

	    break;

	  default:

	    dstring_append_char (&dstring, c);

	    break;

	}

    }

  eof:

    E_rename_unexpected_eof (istream);

    dstring_destroy (&dstring);

    token->tag = RTOK_EOF;

}

static void

rename_file_read_string PROTO_N ((istream, token))

			PROTO_T (IStreamP     istream X

				 RenameTokenP token)

{

    DStringT dstring;

    NStringT nstring;

    dstring_init (&dstring);

    for (;;) {

	char c;

      redo:

	switch (c = ISTREAM_READ_CHAR (istream)) {

	  case '\0':

	    ISTREAM_HANDLE_NULL (istream, redo, eof);

	    dstring_append_char (&dstring, '\0');

	    break;

	  case '\n':

	    istream_inc_line (istream);

	    E_rename_unexpected_newline (istream);

	    break;

	  case '"':

	    dstring_to_nstring (&dstring, &nstring);

	    dstring_destroy (&dstring);

	    name_key_init_string (&(token->u.name), &nstring);

	    token->tag = RTOK_NAME;

	    return;

	  case '[': case ']': case '.':

	    E_rename_illegal_char (istream, c);

	    break;

	  case '\\':

	    switch (istream_read_escaped_char (istream, &c)) EXHAUSTIVE {

	      case ISTREAM_STAT_READ_CHAR:

		dstring_append_char (&dstring, c);

		break;

	      case ISTREAM_STAT_SYNTAX_ERROR:

		E_rename_illegal_escape (istream);

		break;

	      case ISTREAM_STAT_NO_CHAR:

		/*NOTHING*/

		break;

	    }

	    break;

	  default:

	    dstring_append_char (&dstring, c);

	    break;

	}

    }

  eof:

    E_rename_unexpected_eof (istream);

    dstring_destroy (&dstring);

    token->tag = RTOK_EOF;

}

static void

rename_file_next_token PROTO_N ((istream, token))

		       PROTO_T (IStreamP     istream X

				RenameTokenP token)

{

    char c;

  again:

    if (rename_file_skip_white_space (istream, &c)) {

	switch (c) {

	  case '[':

	    rename_file_read_unique (istream, token);

	    break;

	  case '\'':

	     rename_file_read_shape (istream, token);

	    break;

	  case '"':

	    rename_file_read_string (istream, token);

	    break;

	  case ';':

	    token->tag = RTOK_SEMI;

	    break;

	  default:

	    E_rename_illegal_char (istream, c);

	    goto again;

	}

    } else {

	token->tag = RTOK_EOF;

    }

}

static void

rename_file_parse_names PROTO_N ((istream, shape, arg_data, token))

			PROTO_T (IStreamP     istream X

				 NStringP     shape X

				 ArgDataP     arg_data X

				 RenameTokenP token)

{

    rename_file_next_token (istream, token);

    while (token->tag == RTOK_NAME) {

	NameKeyT name;

	name_key_assign (&name, &(token->u.name));

	rename_file_next_token (istream, token);

	if (token->tag != RTOK_NAME) {

	    E_rename_expected_name (istream);

	    name_key_destroy (&name);

	    if (token->tag != RTOK_SEMI) {

		return;

	    }

	    rename_file_next_token (istream, token);

	} else {

	    NameKeyT to_name;

	    name_key_assign (&to_name, &(token->u.name));

	    arg_data_add_rename (arg_data, shape, &name, &to_name);

	    rename_file_next_token (istream, token);

	    if (token->tag != RTOK_SEMI) {

		E_rename_expected_semi (istream);

	    } else {

		rename_file_next_token (istream, token);

	    }

	}

    }

}

static void

rename_file_parse_1 PROTO_N ((istream, arg_data))

		    PROTO_T (IStreamP istream X

			     ArgDataP arg_data)

{

    BoolT        need_error = TRUE;

    RenameTokenT token;

    NStringT     shape;

    rename_file_next_token (istream, &token);

    while (token.tag != RTOK_EOF) {

	switch (token.tag) {

	  case RTOK_SHAPE:

	    nstring_assign (&shape, &(token.u.shape));

	    rename_file_parse_names (istream, &shape, arg_data, &token);

	    nstring_destroy (&shape);

	    need_error = TRUE;

	    break;

	  case RTOK_NAME:

	    name_key_destroy (&(token.u.name));

	    FALL_THROUGH;

	  default:

	    if (need_error) {

		E_rename_expected_shape (istream);

		need_error = FALSE;

	    }

	    rename_file_next_token (istream, &token);

	    break;

	}

    }

}

/*--------------------------------------------------------------------------*/

void

rename_file_parse PROTO_N ((name, arg_data))

		  PROTO_T (CStringP name X

			   ArgDataP arg_data)

{

    IStreamT istream;

    if (istream_open (&istream, name)) {

	rename_file_parse_1 (&istream, arg_data);

	istream_close (&istream);

    } else {

	E_cannot_open_rename_file (name);

    }

    if (error_max_reported_severity () >= ERROR_SEVERITY_ERROR) {

	exit (EXIT_FAILURE);

	UNREACHED;

    }

}

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../library" "../tdf")

 * eval: (include::add-path-entry "../generated")

 * End:

**/