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wtt.h

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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