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/*

 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 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.

*/

/**** error-file.c --- Error file parsing routines.

 *

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

 *

 **** Commentary:

 *

 * This file implements the error file parsing facility specified in the file

 * "error-file.h".  See that file for more details.

 *

 **** Change Log:

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

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

 * First version to be checked into rolling release.

 *

 * Revision 1.3  1994/12/12  11:44:37  smf

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

 * OSSG C Coding Standards.

 *

 * Revision 1.2  1994/08/22  09:36:44  smf

 * Fixed bug DR114:ids-too-long.

 *

 * Revision 1.1.1.1  1994/07/25  16:05:49  smf

 * Initial import of library shared files.

 *

**/

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

#include "error-file.h"

#include "dstring.h"

#include "error.h"

#include "gen-errors.h"

#include "syntax.h"

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

#ifdef FS_NO_ENUM

typedef int ErrorFileTagT, *ErrorFileTagP;

#define EFTOKEN_NAME		(0)

#define EFTOKEN_STRING		(1)

#define EFTOKEN_BLT_STRINGS	(2)

#define EFTOKEN_BLT_PREFIX	(3)

#define EFTOKEN_BLT_ERRORS	(4)

#define EFTOKEN_EOF		(5)

#else

typedef enum {

    EFTOKEN_NAME,

    EFTOKEN_STRING,

    EFTOKEN_BLT_STRINGS,

    EFTOKEN_BLT_PREFIX,

    EFTOKEN_BLT_ERRORS,

    EFTOKEN_EOF

} ErrorFileTagT, *ErrorFileTagP;

#endif /* defined (FS_NO_ENUM) */

typedef struct ErrorFileLexT {

    ErrorFileTagT		tag;

    union {

	CStringP		string;

    } u;

} ErrorFileLexT, *ErrorFileLexP;

#ifdef FS_NO_ENUM

typedef int ErrorFileTokenT, *ErrorFileTokenP;

#define EFN_BUILTIN	(0)

#define EFN_NAME	(1)

#define EFN_STRING	(2)

#else

typedef enum {

    EFN_BUILTIN,

    EFN_NAME,

    EFN_STRING

} ErrorFileTokenT, *ErrorFileTokenP;

#endif /* defined (FS_NO_ENUM) */

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

static BoolT

error_file_skip_white_space(IStreamP istream,				     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);

	    }

	}

    }

  eof:

    return(FALSE);

}

static void

error_file_null_character(IStreamP        istream,				   ErrorFileTokenT type)

{

    switch (type)EXHAUSTIVE {

      case EFN_NAME:

	E_errf_null_character_in_name(istream);

	UNREACHED;

      case EFN_BUILTIN:

	E_errf_null_char_in_builtin(istream);

	UNREACHED;

      case EFN_STRING:

	E_errf_null_character_in_string(istream);

	UNREACHED;

    }

}

static void

error_file_newline(IStreamP        istream,			    ErrorFileTokenT type)

{

    switch (type)EXHAUSTIVE {

      case EFN_NAME:

	E_errf_newline_in_name(istream);

	UNREACHED;

      case EFN_BUILTIN:

	E_errf_newline_in_builtin(istream);

	UNREACHED;

      case EFN_STRING:

	E_errf_newline_in_string(istream);

	UNREACHED;

    }

}

static void

error_file_illegal_escape(IStreamP        istream,				   ErrorFileTokenT type)

{

    switch (type)EXHAUSTIVE {

      case EFN_NAME:

	E_errf_illegal_escape_in_name(istream);

	UNREACHED;

      case EFN_BUILTIN:

	E_errf_illegal_esc_in_builtin(istream);

	UNREACHED;

      case EFN_STRING:

	E_errf_illegal_escape_in_string(istream);

	UNREACHED;

    }

}

static void

error_file_eof(IStreamP        istream,			ErrorFileTokenT type)

{

    switch (type)EXHAUSTIVE {

      case EFN_NAME:

	E_errf_eof_in_name(istream);

	UNREACHED;

      case EFN_BUILTIN:

	E_errf_eof_in_builtin(istream);

	UNREACHED;

      case EFN_STRING:

	E_errf_eof_in_string(istream);

	UNREACHED;

    }

}

static void

error_file_read_until(IStreamP        istream,			       char            term, 

			       ErrorFileTokenT type, 

			       ErrorFileLexP   token)

{

    DStringT dstring;

    dstring_init(&dstring);

    for (;;) {

	char c;

      redo:

	switch (c = ISTREAM_READ_CHAR(istream)) {

	  case '\0':

	    ISTREAM_HANDLE_NULL(istream, redo, eof);

	    error_file_null_character(istream, type);

	    UNREACHED;

	  case '\n':

	    istream_inc_line(istream);

	    error_file_newline(istream, type);

	    UNREACHED;

	  default:

	    if (c == term) {

		CStringP tmp;

		tmp = dstring_to_cstring(&dstring);

		dstring_destroy(&dstring);

		token->u.string = tmp;

		return;

	    } else if (c == '\\') {

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

		  case ISTREAM_STAT_READ_CHAR:

		    if (c == '\0') {

			error_file_null_character(istream, type);

			UNREACHED;

		    }

		    dstring_append_char(&dstring, c);

		    break;

		  case ISTREAM_STAT_SYNTAX_ERROR:

		    error_file_illegal_escape(istream, type);

		    UNREACHED;

		  case ISTREAM_STAT_NO_CHAR:

		    /*NOTHING*/

		    break;

		}

	    } else {

		dstring_append_char(&dstring, c);

	    }

	    break;

	}

    }

  eof:

    error_file_eof(istream, type);

    UNREACHED;

}

static void

error_file_check_builtin(IStreamP      istream,				  ErrorFileLexP token)

{

    if (cstring_ci_equal(token->u.string, "strings")) {

	token->tag = EFTOKEN_BLT_STRINGS;

    } else if (cstring_ci_equal(token->u.string, "prefix")) {

	token->tag = EFTOKEN_BLT_PREFIX;

    } else if (cstring_ci_equal(token->u.string, "errors")) {

	token->tag = EFTOKEN_BLT_ERRORS;

    } else {

	E_errf_unknown_builtin(istream, token->u.string);

	UNREACHED;

    }

    DEALLOCATE(token->u.string);

}

static void

error_file_next_token(IStreamP      istream,			       ErrorFileLexP token)

{

    char c;

    if (error_file_skip_white_space(istream, &c)) {

	switch (c) {

	  case '%':

	    error_file_read_until(istream, '%', EFN_BUILTIN, token);

	    error_file_check_builtin(istream, token);

	    break;

	  case '\'':

	    error_file_read_until(istream, '\'', EFN_NAME, token);

	    token->tag = EFTOKEN_NAME;

	    break;

	  case '"':

	    error_file_read_until(istream, '"', EFN_STRING, token);

	    token->tag = EFTOKEN_STRING;

	    break;

	  default:

	    E_errf_illegal_character(istream, c);

	    UNREACHED;

	}

    } else {

	token->tag = EFTOKEN_EOF;

    }

}

static void

error_file_parse_strings(IStreamP      istream,				  ErrorFileLexP token)

{

    while (error_file_next_token(istream, token),

	  (token->tag == EFTOKEN_NAME)) {

	CStringP name = token->u.string;

	if (error_file_next_token(istream, token),

	   (token->tag != EFTOKEN_STRING)) {

	    E_errf_expected_string(istream);

	    UNREACHED;

	} else if (!error_redefine_string(name, token->u.string)) {

	    E_errf_unknown_string(istream, name);

	    UNREACHED;

	}

	DEALLOCATE(name);

    }

}

static void

error_file_parse_prefix(IStreamP      istream,				 ErrorFileLexP token)

{

    error_file_next_token(istream, token);

    if (token->tag != EFTOKEN_STRING) {

	E_errf_expected_string(istream);

	UNREACHED;

    } else if (!error_set_prefix_message(token->u.string)) {

	E_errf_illegal_message(istream, token->u.string);

	UNREACHED;

    }

    DEALLOCATE(token->u.string);

    error_file_next_token(istream, token);

}

static void

error_file_parse_errors(IStreamP      istream,				 ErrorFileLexP token)

{

    while (error_file_next_token(istream, token),

	  (token->tag == EFTOKEN_NAME)) {

	CStringP name = token->u.string;

	error_file_next_token(istream, token);

	if (token->tag != EFTOKEN_STRING) {

	    E_errf_expected_string(istream);

	    UNREACHED;

	} else {

	    switch (error_redefine_error(name, token->u.string))EXHAUSTIVE {

	      case ERROR_STATUS_BAD_ERROR:

		E_errf_unknown_error(istream, name);

		UNREACHED;

	      case ERROR_STATUS_BAD_MESSAGE:

		E_errf_illegal_message(istream, token->u.string);

		UNREACHED;

	      case ERROR_STATUS_SUCCESS:

		/*NOTHING*/

		break;

	    }

	}

	DEALLOCATE(name);

	DEALLOCATE(token->u.string);

    }

}

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

void

error_file_parse(CStringP name,			  BoolT    must_open)

{

    IStreamT      istream;

    ErrorFileLexT token;

    if (istream_open(&istream, name)) {

	error_file_next_token(&istream, &token);

	while (token.tag != EFTOKEN_EOF) {

	    switch (token.tag) {

	      case EFTOKEN_BLT_STRINGS:

		error_file_parse_strings(&istream, &token);

		break;

	      case EFTOKEN_BLT_PREFIX:

		error_file_parse_prefix(&istream, &token);

		break;

	      case EFTOKEN_BLT_ERRORS:

		error_file_parse_errors(&istream, &token);

		break;

	      default:

		E_errf_expected_section(&istream);

		UNREACHED;

	    }

	}

	istream_close(&istream);

    } else if (must_open) {

	E_errf_cannot_open(name);

	UNREACHED;

    }

}

/*

 * Local variables(smf):

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

 * end:

**/