for natz

gistfile1.js

/*!
 * Copyleft (c) 2011 ${name}.
 * Licensed under the ${license} license.
 *
 * @version ${Version}
 */
var correctThaiFloatingVowel = function (text, anchor, el, options) {
  
  /**
   * @return string from character code provided.
   */
  var _ = function (code) {
    return String.fromCharCode(code);
  };

  var 
    // Lower level characters
    SARA_U  = _(0xE38),
    SARA_UU = _(0xE39),
    PHINTHU = _(0xE3A),
      
    // Lower level characters after pullDown
    SARA_U_DOWN  = _(0xF718),
    SARA_UU_DOWN = _(0xF719),
    PHINTHU_DOWN = _(0xF71A),

    // Upper level 1 characters
    MAI_HAN_AKAT = _(0xE31),
    SARA_AM      = _(0xE33),
    SARA_I       = _(0xE34),
    SARA_Ii      = _(0xE35),
    SARA_Ue      = _(0xE36),
    SARA_Uee     = _(0xE37),
    MAI_TAI_KHU  = _(0xE47),

    // Upper level 1 characters after shift left
    MAI_HAN_AKAT_LEFT_SHIFT = _(0xF710),
    SARA_I_LEFT_SHIFT       = _(0xF701),
    SARA_Ii_LEFT_SHIFT      = _(0xF702),
    SARA_Ue_LEFT_SHIFT      = _(0xF703),
    SARA_Uee_LEFT_SHIFT     = _(0xF704),
    MAI_TAI_KHU_LEFT_SHIFT  = _(0xF712),

    // Upper level 2 characters
    MAI_EK      = _(0xE48),
    MAI_THO     = _(0xE49),
    MAI_TRI     = _(0xE4A),
    MAIchATTAWA = _(0xE4B),
    THANTHAKHAT = _(0xE4C),
    NIKHAHIT    = _(0xE4D),

    // Upper level 2 characters after pull down
    MAI_EK_DOWN      = _(0xF70A),
    MAI_THO_DOWN     = _(0xF70B),
    MAI_TRI_DOWN     = _(0xF70C),
    MAIchATTAWA_DOWN = _(0xF70D),
    THANTHAKHAT_DOWN = _(0xF70E),
  
    // Upper level 2 characters after pull down and shift left
    MAI_EK_PULL_DOWN_AND_LEFT_SHIFT      = _(0xF705),
    MAI_THO_PULL_DOWN_AND_LEFT_SHIFT     = _(0xF706),
    MAI_TRI_PULL_DOWN_AND_LEFT_SHIFT     = _(0xF707),
    MAIchATTAWA_PULL_DOWN_AND_LEFT_SHIFT = _(0xF708),
    THANTHAKHAT_PULL_DOWN_AND_LEFT_SHIFT = _(0xF709),

    // Upper level 2 characters after shift left
    MAI_EK_LEFT_SHIFT      = _(0xF713),
    MAI_THO_LEFT_SHIFT     = _(0xF714),
    MAI_TRI_LEFT_SHIFT     = _(0xF715),
    MAIchATTAWA_LEFT_SHIFT = _(0xF716),
    THANTHAKHAT_LEFT_SHIFT = _(0xF717),
    NIKHAHIT_LEFT_SHIFT    = _(0xF711),

    // Up tail characters
    PO_PLA  = _(0x0E1B),
    FO_FA   = _(0x0E1D),
    FO_FAN  = _(0x0E1F),
    LOchULA = _(0x0E2C),	

    // Down tail characters
    THO_THAN = _(0xE10),
    YO_YING  = _(0xE0D),
    DOchADA  = _(0xE0E),
    TO_PATAK = _(0xE0F),
    RU       = _(0xE24),
    LU       = _(0xE26),

    // Cut tail characters
    THO_THAN_CUT_TAIL = _(0xF700),
    YO_YING_CUT_TAIL  = _(0xF70F),
    
    // for exploded SARA_AM (NIKHAHIT + SARA_AA)
    SARA_AA = _(0xE32);

  var isUpTail = function (ch) {
    return ch == PO_PLA || ch == FO_FA || ch == FO_FAN
           || ch == LOchULA;
  };
	
  var isDownTail = function (ch) {
    return ch == THO_THAN || ch == YO_YING || ch == DOchADA
           || ch == TO_PATAK || ch == RU || ch == LU;
  };

  var isUpperLevel1 = function (ch) {
    return ch == MAI_HAN_AKAT || ch == SARA_I || ch == SARA_Ii
	   || ch == SARA_Ue || ch == SARA_Uee || ch == MAI_TAI_KHU
	   || ch == NIKHAHIT;
  };

  var isLeftShiftUpperLevel1 = function (ch) {
    return ch == MAI_HAN_AKAT_LEFT_SHIFT || ch == SARA_I_LEFT_SHIFT
	   || ch == SARA_Ii_LEFT_SHIFT || ch == SARA_Ue_LEFT_SHIFT
	   || ch == SARA_Uee_LEFT_SHIFT || ch == MAI_TAI_KHU_LEFT_SHIFT
           || ch == NIKHAHIT_LEFT_SHIFT;
  };
	
  var isUpperLevel2 = function (ch) {
    return ch == MAI_EK	|| ch == MAI_THO || ch == MAI_TRI
	   || ch == MAIchATTAWA || ch == THANTHAKHAT;
  };

  var isLowerLevel(ch) {
    return ch == SARA_U || ch == SARA_UU || ch == PHINTHU;
  };

  var pullDownAndShiftLeft = function (ch) {
    switch (ch) {
      case MAI_EK:
	return MAI_EK_PULL_DOWN_AND_LEFT_SHIFT;
	
      case MAI_THO:
	return MAI_THO_PULL_DOWN_AND_LEFT_SHIFT;
	
      case MAI_TRI:
	return MAI_TRI_PULL_DOWN_AND_LEFT_SHIFT;
	
      case MAI_CHATTAWA:
	return MAI_CHATTAWA_PULL_DOWN_AND_LEFT_SHIFT;
	
      case MAI_HAN_AKAT:
	return MAI_HAN_AKAT_LEFT_SHIFT;
	
      case THANTHAKHAT:
	return THANTHAKHAT_PULL_DOWN_AND_LEFT_SHIFT;
	
      default:
	return ch;
    }
  };

  var shiftLeft(ch) {
    switch (ch) {
      case MAI_EK:
	return MAI_EK_LEFT_SHIFT;
	
      case MAI_THO:
	return MAI_THO_LEFT_SHIFT;
	
      case MAI_TRI:
	return MAI_TRI_LEFT_SHIFT;
	
      case MAI_CHATTAWA:
	return MAI_CHATTAWA_LEFT_SHIFT;
	
      case MAI_HAN_AKAT:
	return MAI_HAN_AKAT_LEFT_SHIFT;
	
      case SARA_I:
	return SARA_I_LEFT_SHIFT;
	
      case SARA_Ii:
	return SARA_Ii_LEFT_SHIFT;
	
      case SARA_Ue:
	return SARA_Ue_LEFT_SHIFT;
	
      case SARA_Uee:
	return SARA_Uee_LEFT_SHIFT;
	
      case MAI_TAI_KHU:
	return MAI_TAI_KHU_LEFT_SHIFT;
	
      case NIKHAHIT:
	return NIKHAHIT_LEFT_SHIFT;
	
      default:
	return ch;
    }
  };
  
  var pullDown(ch) {
    switch (ch) {
      case MAI_EK:
	return MAI_EK_DOWN;
	
      case MAI_THO:
	return MAI_THO_DOWN;
	
      case MAI_TRI:
	return MAI_TRI_DOWN;
	
      case MAI_CHATTAWA:
	return MAI_CHATTAWA_DOWN;
	
      case THANTHAKHAT:
	return THANTHAKHAT_DOWN;
	
      case SARA_U:
	return SARA_U_DOWN;
	
      case SARA_UU:
	return SARA_UU_DOWN;
	
      case PHINTHU:
	return PHINTHU_DOWN;
	
      default:
	return ch;
    }
  };

  var cutTail(ch) {
    switch(ch) {
      case THO_THAN:
	return THO_THAN_CUT_TAIL;
	
      case YO_YING:
	return YO_YING_CUT_TAIL;
	
      default:
	return ch;
    }
  };

  var do_modify(ch) {
    
  };
  
  return text;
}