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/*
* libthai - Thai Language Support Library
* Copyright (C) 2001 Theppitak Karoonboonyanan <thep@linux.thai.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* wtt.h - WTT I/O implementation
* Created: 2001-08-04
*/
#ifndef THAI_WTT_H
#define THAI_WTT_H
/**
* @file wtt.h
* @brief WTT I/O implementation
*
* WTT stands for Wing Tuk Tee (in Thai, Runs everywhere). It was defined by
* TACTIS (Thai API Consortium/Thai Industrial Standard) in the NECTEC Thai
* Software Standard Project (1989-1991), and later endorsed by Thai
* Industrial Standard Institute (TISI) as TIS 1566-2541 in 1998.
*
* WTT classifies Thai chracter(TIS-620) into 17 types below.
*
* <pre>
* <b>ITYPE VALUE SHORT_DESCRIPTION</b>
* CTRL 0 control characters
* NON 1 non composible characters
* CONS 2 consonants
* LV 3 leading vowels
* FV1 4 following vowels 1
* FV2 5 following vowels 2
* FV3 6 following vowels 3
* BV1 7 below vowels 1
* BV2 8 below vowels 2
* BD 9 below diacritics
* TONE 10 tonemarks
* AD1 11 above diacritics 1
* AD2 12 above diacritics 2
* AD3 13 above diacritics 3
* AV1 14 above vowels 1
* AV2 15 above vowels 2
* AV3 16 above vowels 3
* </pre>
*
* Functions in thctype.h do basic character classifications while
* wtt.h classifies a chracter in detail. Please refer to the reference.
*
* TACio_op() checks how to compose two given chracters. The possiblities are
* Composible (CP), Non-display (XC), Accept (AC), Reject (RJ) and Strict
* Reject (SR). The values of CP, XC, AC, RJ and SR are difined in wtt.h.
* And their meanings are:
*
* @li CP : second character is displayed in the same cell as the first,
* also implies an acceptance.
* @li XC : Do nothing.
* @li AC : Display second character in the next cell.
* @li RJ : Discard second character.
* @li SR : Reject second character only in strict mode.
*
*/
#include <thai/thailib.h>
BEGIN_CDECL
/**
* @brief Classification of characters in TIS620 according to WTT
*/
typedef enum {
CTRL = 0, /**< control chars */
NON = 1, /**< non composibles */
CONS = 2, /**< consonants */
LV = 3, /**< leading vowels */
FV1 = 4, /**< following vowels 1 */
FV2 = 5, /**< following vowels 2 */
FV3 = 6, /**< following vowels 3 */
BV1 = 7, /**< below vowels 1 */
BV2 = 8, /**< below vowels 2 */
BD = 9, /**< below diacritics */
TONE = 10, /**< tonemarks */
AD1 = 11, /**< above diacritics 1 */
AD2 = 12, /**< above diacritics 2 */
AD3 = 13, /**< above diacritics 3 */
AV1 = 14, /**< above vowels 1 */
AV2 = 15, /**< above vowels 2 */
AV3 = 16 /**< above vowels 3 */
} WTTClass;
/**
* @brief Composibility checking tables
*/
typedef enum {
CP = 1, /**< COMPOSIBLE - following char is displayed in the same cell
as leading char, also implies ACCEPT */
XC = 2, /**< Non-display */
AC = 3, /**< ACCEPT - display the following char in the next cell */
RJ = 4, /**< REJECT - discard that following char, ignore it */
SR = 5 /**< STRICT REJECT - REJECT only if in strict mode */
} WTTOp;
extern WTTClass TACchtype(thchar_t c);
extern WTTOp TACio_op(thchar_t c1, thchar_t c2);
/*
* implementation parts
*/
extern short TACchtype_[256];
extern short TACio_op_[17][17];
#define TACchtype(c) (TACchtype_[c])
#define TACio_op(c1, c2) (TACio_op_[TACchtype(c1)][TACchtype(c2)])
END_CDECL
#endif /* THAI_WTT_H */
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