/*
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.inputmethods.internal.thaiim;
import java.awt.im.InputMethodRequests;
public class ThaiRules {
public static final char BASE = 0x0e00;
public static final byte NON = 0;
public static final byte CONS = 1;
public static final byte LV = 2;
public static final byte FV1 = 3;
public static final byte FV2 = 4;
public static final byte FV3 = 5;
public static final byte FV4 = 6;
/* Note that FV4 is added. It is not in WTT.
* We need it for SARA AM since it has a
* weired characteristic to share the same
* cell with whatever consonant preceeds it.
*/
public static final byte BV1 = 7;
public static final byte BV2 = 8;
public static final byte BD = 9;
public static final byte TONE = 10;
public static final byte AD1 = 11;
public static final byte AD2 = 12;
public static final byte AD3 = 13;
public static final byte AV1 = 14;
public static final byte AV2 = 15;
public static final byte AV3 = 16;
/**
* Constants for validity checking and auto correction
*/
public static final byte STRICT = 0;
public static final byte LOOSE = 1;
public static final byte NOREPLACE = 2;
public static final byte[] CHARTYPE = {
/* 0e00 UNUSED */ NON,
/* THAI CHARACTER KO KAI */ CONS,
/* THAI CHARACTER KHO KHAI */ CONS,
/* THAI CHARACTER KHO KHUAT */ CONS,
/* THAI CHARACTER KHO KHWAI */ CONS,
/* THAI CHARACTER KHO KHON */ CONS,
/* THAI CHARACTER KHO RAKHANG */ CONS,
/* THAI CHARACTER NGO NGU */ CONS,
/* THAI CHARACTER CHO CHAN */ CONS,
/* THAI CHARACTER CHO CHING */ CONS,
/* THAI CHARACTER CHO CHANG */ CONS,
/* THAI CHARACTER SO SO */ CONS,
/* THAI CHARACTER CHO CHOE */ CONS,
/* THAI CHARACTER YO YING */ CONS,
/* THAI CHARACTER DO CHADA */ CONS,
/* THAI CHARACTER TO PATAK */ CONS,
/* THAI CHARACTER THO THAN */ CONS,
/* THAI CHARACTER THO NANGMONTHO */ CONS,
/* THAI CHARACTER THO PHUTHAO */ CONS,
/* THAI CHARACTER NO NEN */ CONS,
/* THAI CHARACTER DO DEK */ CONS,
/* THAI CHARACTER TO TAO */ CONS,
/* THAI CHARACTER THO THUNG */ CONS,
/* THAI CHARACTER THO THAHAN */ CONS,
/* THAI CHARACTER THO THONG */ CONS,
/* THAI CHARACTER NO NU */ CONS,
/* THAI CHARACTER BO BAIMAI */ CONS,
/* THAI CHARACTER PO PLA */ CONS,
/* THAI CHARACTER PHO PHUNG */ CONS,
/* THAI CHARACTER FO FA */ CONS,
/* THAI CHARACTER PHO PHAN */ CONS,
/* THAI CHARACTER FO FAN */ CONS,
/* THAI CHARACTER PHO SAMPHAO */ CONS,
/* THAI CHARACTER MO MA */ CONS,
/* THAI CHARACTER YO YAK */ CONS,
/* THAI CHARACTER RO RUA */ CONS,
/* THAI CHARACTER RU */ FV3,
/* THAI CHARACTER LO LING */ CONS,
/* THAI CHARACTER LU */ FV3,
/* THAI CHARACTER WO WAEN */ CONS,
/* THAI CHARACTER SO SALA */ CONS,
/* THAI CHARACTER SO RUSI */ CONS,
/* THAI CHARACTER SO SUA */ CONS,
/* THAI CHARACTER HO HIP */ CONS,
/* THAI CHARACTER LO CHULA */ CONS,
/* THAI CHARACTER O ANG */ CONS,
/* THAI CHARACTER HO NOKHUK */ CONS,
/* THAI CHARACTER PAIYANNOI */ NON,
/* THAI CHARACTER SARA A */ FV1,
/* THAI CHARACTER MAI HAN-AKAT */ AV2,
/* THAI CHARACTER SARA AA */ FV1,
/* THAI CHARACTER SARA AM */ FV4,
/* THAI CHARACTER SARA I */ AV1,
/* THAI CHARACTER SARA II */ AV3,
/* THAI CHARACTER SARA UE */ AV2,
/* THAI CHARACTER SARA UEE */ AV3,
/* THAI CHARACTER SARA U */ BV1,
/* THAI CHARACTER SARA UU */ BV2,
/* THAI CHARACTER PHINTHU */ BD,
/* 0e3b UNUSED */ NON,
/* 0e3c UNUSED */ NON,
/* 0e3d UNUSED */ NON,
/* 0e3e UNUSED */ NON,
/* THAI CURRENCY SYMBOL BAHT */ NON,
/* THAI CHARACTER SARA E */ LV,
/* THAI CHARACTER SARA AE */ LV,
/* THAI CHARACTER SARA O */ LV,
/* THAI CHARACTER SARA AI MAIMUAN */ LV,
/* THAI CHARACTER SARA AI MAIMALAI */ LV,
/* THAI CHARACTER LAKKHANGYAO */ FV2,
/* THAI CHARACTER MAIYAMOK */ NON,
/* THAI CHARACTER MAITAIKHU */ AD2,
/* THAI CHARACTER MAI EK */ TONE,
/* THAI CHARACTER MAI THO */ TONE,
/* THAI CHARACTER MAI TRI */ TONE,
/* THAI CHARACTER MAI CHATTAWA */ TONE,
/* THAI CHARACTER THANTHAKHAT */ AD1,
/* THAI CHARACTER NIKHAHIT */ AD3,
/* THAI CHARACTER YAMAKKAN */ AD3,
/* THAI CHARACTER FONGMAN */ NON,
/* THAI DIGIT ZERO */ NON,
/* THAI DIGIT ONE */ NON,
/* THAI DIGIT TWO */ NON,
/* THAI DIGIT THREE */ NON,
/* THAI DIGIT FOUR */ NON,
/* THAI DIGIT FIVE */ NON,
/* THAI DIGIT SIX */ NON,
/* THAI DIGIT SEVEN */ NON,
/* THAI DIGIT EIGHT */ NON,
/* THAI DIGIT NINE */ NON,
/* THAI CHARACTER ANGKHANKHU */ NON,
/* THAI CHARACTER KHOMUT */ NON
};
private InputMethodRequests requests;
ThaiRules(InputMethodRequests requests) {
this.requests = requests;
}
public static byte getCharType(char c) {
byte cType;
int ci = ((int) c) - (int) BASE;
if (ci < 0 || ci >= CHARTYPE.length)
cType = NON;
else
cType = CHARTYPE[ci];
return cType;
}
private static boolean isValid(char c1, char c2, int[] validityArray) {
return ((validityArray[getCharType(c1)]
& (1 << getCharType(c2))) != 0);
}
/**
* VALIDITY is a bit matrix defining whether one
* character is allowed to be typed in after the
* previous one (array index). Determining the
* validity is done by bit-anding the 2nd char
* type's mask (obtained by 1 << chartype) with
* the array element indexed by the first char
* type. If the result is non-zero, the 2nd
* character is allowed to follow the first.
*/
/* Please note that the bits in the comment below
* are displayed least significant bit first.
* The actual value reflexs this representation
* when the bits are swapped.
*/
private static final int[] INPUTVALIDITY = {
/* NON 1110 010 0 0000 0000 0 */ 0x00027,
/* CONS 1111 111 1 1111 1111 1 */ 0x1ffff,
/* LV 0100 000 0 0000 0000 0 */ 0x00002,
/* FV1 1110 010 0 0000 0000 0 */ 0x00027,
/* FV2 1110 010 0 0000 0000 0 */ 0x00027,
/* FV3 1110 110 0 0000 0000 0 */ 0x00037,
/* FV4 1110 010 0 0000 0000 0 */ 0x00027,
/* BV1 1110 010 0 0011 0000 0 */ 0x00c27,
/* BV2 1110 010 0 0010 0000 0 */ 0x00427,
/* BD 1110 010 0 0000 0000 0 */ 0x00027,
/* TONE 1111 011 0 0000 0000 0 */ 0x0006f,
/* AD1 1110 010 0 0000 0000 0 */ 0x00027,
/* AD2 1110 010 0 0000 0000 0 */ 0x00027,
/* AD3 1110 010 0 0000 0000 0 */ 0x00027,
/* AV1 1110 010 0 0011 0000 0 */ 0x00c27,
/* AV2 1110 010 0 0010 0000 0 */ 0x00427,
/* AV3 1110 010 0 0010 0100 0 */ 0x02427
};
private static final int[] COMPOSABLE = {
/* NON 0000 000 0 0000 0000 0 */ 0x00000,
/* CONS 0000 001 1 1111 1111 1 */ 0x1ffc0,
/* LV 0000 000 0 0000 0000 0 */ 0x00000,
/* FV1 0000 000 0 0000 0000 0 */ 0x00000,
/* FV2 0000 000 0 0000 0000 0 */ 0x00000,
/* FV3 0000 000 0 0000 0000 0 */ 0x00000,
/* FV4 0000 000 0 0000 0000 0 */ 0x00000,
/* BV1 0000 000 0 0011 0000 0 */ 0x00c00,
/* BV2 0000 000 0 0010 0000 0 */ 0x00400,
/* BD 0000 000 0 0000 0000 0 */ 0x00000,
/* TONE 0000 001 0 0000 0000 0 */ 0x00040,
/* AD1 0000 000 0 0000 0000 0 */ 0x00000,
/* AD2 0000 000 0 0000 0000 0 */ 0x00000,
/* AD3 0000 000 0 0000 0000 0 */ 0x00000,
/* AV1 0000 000 0 0011 0000 0 */ 0x00c00,
/* AV2 0000 000 0 0010 0000 0 */ 0x00400,
/* AV3 0000 000 0 0010 0100 0 */ 0x02400
};
private static final int[] REPLACABLE = {
/* NON 0000 000 0 0000 0000 0 */ 0x00000,
/* CONS 0000 000 0 0000 0000 0 */ 0x00000,
/* LV 0000 000 0 0000 0000 0 */ 0x00000,
/* FV1 0000 000 0 0000 0000 0 */ 0x00000,
/* FV2 0000 000 0 0000 0000 0 */ 0x00000,
/* FV3 0000 000 0 0000 0000 0 */ 0x00000,
/* FV4 0000 001 1 1001 1111 1 */ 0x1f9c0,
/* BV1 0000 001 1 1100 1111 1 */ 0x1f3c0,
/* BV2 0000 001 1 1101 1111 1 */ 0x1fbc0,
/* BD 0000 001 1 1111 1111 1 */ 0x1ffc0,
/* TONE 0000 000 0 0111 1100 0 */ 0x03e00,
/* AD1 0000 001 0 1111 1101 1 */ 0x1bf40,
/* AD2 0000 001 1 1111 1111 1 */ 0x1ffc0,
/* AD3 0000 001 1 1111 1111 0 */ 0x0ffc0,
/* AV1 0000 001 1 1100 1111 1 */ 0x1f3c0,
/* AV2 0000 001 1 1101 1111 1 */ 0x1fbc0,
/* AV3 0000 001 1 1101 1011 1 */ 0x1dbc0
};
private static final int[] SWAPPABLE = {
/* NON 0000 000 0 0000 0000 0 */ 0x00000,
/* CONS 0000 000 0 0000 0000 0 */ 0x00000,
/* LV 0000 000 0 0000 0000 0 */ 0x00000,
/* FV1 0000 000 0 0000 0000 0 */ 0x00000,
/* FV2 0000 000 0 0000 0000 0 */ 0x00000,
/* FV3 0000 000 0 0000 0000 0 */ 0x00000,
/* FV4 0000 000 0 0010 0000 0 */ 0x00400,
/* BV1 0000 000 0 0000 0000 0 */ 0x00000,
/* BV2 0000 000 0 0000 0000 0 */ 0x00000,
/* BD 0000 000 0 0000 0000 0 */ 0x00000,
/* TONE 0000 000 1 1000 0011 1 */ 0x1c180,
/* AD1 0000 000 1 0000 0010 0 */ 0x04080,
/* AD2 0000 000 0 0000 0000 0 */ 0x00000,
/* AD3 0000 000 0 0000 0000 1 */ 0x10000,
/* AV1 0000 000 0 0000 0000 0 */ 0x00000,
/* AV2 0000 000 0 0000 0000 0 */ 0x00000,
/* AV3 0000 000 0 0000 0000 0 */ 0x00000
};
public static boolean isInputValid(char c1, char c2) {
return isValid(c1, c2, INPUTVALIDITY);
}
public static boolean isComposable(char c1, char c2) {
return isValid(c1, c2, COMPOSABLE);
}
public static boolean isSwappable(char c1, char c2) {
return isValid(c1, c2, SWAPPABLE);
}
public static boolean isReplacable(char c1, char c2) {
return isValid(c1, c2, REPLACABLE);
}
public static boolean isForward(char c) {
return (getCharType(c) < FV4);
}
public static boolean isDead(char c) {
return (getCharType(c) > FV3);
}
public boolean isInputValid(char current) {
int offset = requests.getInsertPositionOffset();
if (offset == 0) {
byte charType = getCharType(current);
return ((charType < FV1) || (charType == FV3));
}
else {
char prev = requests.getCommittedText(offset-1, offset, null).first();
if(isForward(current)) {
if (isInputValid(prev, current)) {
if (getCharType(prev) == TONE &&
getCharType(current) == FV1) {
if (offset == 1) {
return true;
} else {
char pprev =
requests.getCommittedText(offset-2, offset-1, null).first();
return isInputValid(pprev, current);
}
} else {
return true;
}
} else if (prev == '\u0e32' && // SARA AA
current == '\u0e30') { // SARA A
return true;
} else if (prev == '\u0e4d' && // NIKAHIT
current == '\u0e32') { // SARA AA
// Special compose to SARA AM
return true;
} else {
return false;
}
} else {
if(isInputValid(prev, current)) {
if (getCharType(prev) == TONE &&
getCharType(current) == FV4) {
return (offset != 1);
} else {
return true;
}
} else {
return false;
}
}
}
}
}