libthai 0.1.29
wtt.h File Reference

WTT I/O implementation. More...

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. More...
 
enum  WTTOp {
  CP = 1 , XC = 2 , AC = 3 , RJ = 4 ,
  SR = 5
}
 Composibility checking tables. More...
 

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

◆ WTTClass

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

◆ WTTOp

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

◆ TACchtype()

WTTClass TACchtype ( thchar_t c)
extern

WTT character class.

Parameters
c: the character
Returns
WTT character class { CTRL, ..., AV3 }

◆ TACio_op()

WTTOp TACio_op ( thchar_t c1,
thchar_t c2 )
extern

WTT I/O operation.

Parameters
c1: previous character
c2: next character
Returns
WTT I/O operation { CP, XC, AC, RJ, SR }

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