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thai/wtt.h(3) libthai 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:

control chars
non composibles
consonants
leading vowels
following vowels 1
following vowels 2
following vowels 3
below vowels 1
below vowels 2
below diacritics
tonemarks
above diacritics 1
above diacritics 2
above diacritics 3
above vowels 1
above vowels 2
above vowels 3

enum WTTOp

Composibility checking tables.

Enumerator:

COMPOSIBLE - following char is displayed in the same cell as leading char, also implies ACCEPT
Non-display
ACCEPT - display the following char in the next cell
REJECT - discard that following char, ignore it
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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23 Nov 2010 Version 0.1.12