thai/wtt.h(3)

NAME
thai/wtt.h - WTT I/O implementation.

SYNOPSIS

  Enumerations
enum WTTClass { CTRL = 0, NON = 1, CONS = 2, LV = 3, FV1 = 4, FV2 = 5, FV3 = 6, BV1 = 7, BV2 = 8, BD = 9, TONE = 10, AD1 = 11, AD2 = 12, AD3 = 13, AV1 = 14, AV2 = 15, AV3 = 16 }
Classification of characters in TIS620 according to WTT.
enum WTTOp { CP = 1, XC = 2, AC = 3, RJ = 4, SR = 5 }
Composibility checking tables.

  Functions
WTTClass TACchtype (thchar_t c)
WTT character class.
WTTOp TACio_op (thchar_t c1, thchar_t c2)
WTT I/O operation.

Detailed Description

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.

 ITYPE  VALUE SHORT_DESCRIPTION
 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

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:

•   CP : second character is displayed in the same cell as the first, also implies an acceptance.
•   XC : Do nothing.
•   AC : Display second character in the next cell.
•   RJ : Discard second character.
•   SR : Reject second character only in strict mode.

Enumeration Type Documentation

  enum WTTClass
Classification of characters in TIS620 according to WTT.
Enumerator:
CTRL
    control chars
NON non composibles
CONS
    consonants
LV  leading vowels
FV1 following vowels 1
FV2 following vowels 2
FV3 following vowels 3
BV1 below vowels 1
BV2 below vowels 2
BD  below diacritics
TONE
    tonemarks
AD1 above diacritics 1
AD2 above diacritics 2
AD3 above diacritics 3
AV1 above vowels 1
AV2 above vowels 2
AV3 above vowels 3

  enum WTTOp
Composibility checking tables.
Enumerator:
CP  COMPOSIBLE - following char is displayed in the same cell as leading char, also implies ACCEPT
XC  Non-display
AC  ACCEPT - display the following char in the next cell
RJ  REJECT - discard that following char, ignore it
SR  STRICT REJECT - REJECT only if in strict mode

Function Documentation

  WTTClass TACchtype (thchar_t c)
WTT character class.
Parameters:
    c : the character
Returns:
    WTT character class { CTRL, ..., AV3 }

  WTTOp TACio_op (thchar_t c1, thchar_t c2)
WTT I/O operation.
Parameters:
    c1 : previous character
    c2 : next character
Returns:
    WTT I/O operation { CP, XC, AC, RJ, SR }

Author
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