thai/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.

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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:


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 }

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