/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.complexscripts.scripts;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.complexscripts.util.CharAssociation;
import org.apache.fop.complexscripts.util.GlyphSequence;
// CSOFF: LineLengthCheck
/**
* <p>The <code>DevanagariScriptProcessor</code> class implements a script processor for
* performing glyph substitution and positioning operations on content associated with the Devanagari script.</p>
*
* <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
*/
public class DevanagariScriptProcessor extends IndicScriptProcessor {
/** logging instance */
private static final Log log = LogFactory.getLog(DevanagariScriptProcessor.class);
DevanagariScriptProcessor(String script) {
super(script);
}
@Override
protected Class<? extends DevanagariSyllabizer> getSyllabizerClass() {
return DevanagariSyllabizer.class;
}
@Override
// find rightmost pre-base matra
protected int findPreBaseMatra(GlyphSequence gs) {
int ng = gs.getGlyphCount();
int lk = -1;
for (int i = ng; i > 0; i--) {
int k = i - 1;
if (containsPreBaseMatra(gs, k)) {
lk = k;
break;
}
}
return lk;
}
@Override
// find leftmost pre-base matra target, starting from source
protected int findPreBaseMatraTarget(GlyphSequence gs, int source) {
int ng = gs.getGlyphCount();
int lk = -1;
for (int i = (source < ng) ? source : ng; i > 0; i--) {
int k = i - 1;
if (containsConsonant(gs, k)) {
if (containsHalfConsonant(gs, k)) {
lk = k;
} else if (lk == -1) {
lk = k;
} else {
break;
}
}
}
return lk;
}
private static boolean containsPreBaseMatra(GlyphSequence gs, int k) {
CharAssociation a = gs.getAssociation(k);
int[] ca = gs.getCharacterArray(false);
for (int i = a.getStart(), e = a.getEnd(); i < e; i++) {
if (isPreM(ca [ i ])) {
return true;
}
}
return false;
}
private static boolean containsConsonant(GlyphSequence gs, int k) {
CharAssociation a = gs.getAssociation(k);
int[] ca = gs.getCharacterArray(false);
for (int i = a.getStart(), e = a.getEnd(); i < e; i++) {
if (isC(ca [ i ])) {
return true;
}
}
return false;
}
private static boolean containsHalfConsonant(GlyphSequence gs, int k) {
Boolean half = (Boolean) gs.getAssociation(k) .getPredication("half");
return (half != null) ? half : false;
}
@Override
protected int findReph(GlyphSequence gs) {
int ng = gs.getGlyphCount();
int li = -1;
for (int i = 0; i < ng; i++) {
if (containsReph(gs, i)) {
li = i;
break;
}
}
return li;
}
@Override
protected int findRephTarget(GlyphSequence gs, int source) {
int ng = gs.getGlyphCount();
int c1 = -1;
int c2 = -1;
// first candidate target is after first non-half consonant
for (int i = 0; i < ng; i++) {
if ((i != source) && containsConsonant(gs, i)) {
if (!containsHalfConsonant(gs, i)) {
c1 = i + 1;
break;
}
}
}
// second candidate target is after last non-prebase matra after first candidate or before first syllable or vedic mark
for (int i = (c1 >= 0) ? c1 : 0; i < ng; i++) {
if (containsMatra(gs, i) && !containsPreBaseMatra(gs, i)) {
c2 = i + 1;
} else if (containsOtherMark(gs, i)) {
c2 = i;
break;
}
}
if (c2 >= 0) {
return c2;
} else if (c1 >= 0) {
return c1;
} else {
return source;
}
}
private static boolean containsReph(GlyphSequence gs, int k) {
Boolean rphf = (Boolean) gs.getAssociation(k) .getPredication("rphf");
return (rphf != null) ? rphf : false;
}
private static boolean containsMatra(GlyphSequence gs, int k) {
CharAssociation a = gs.getAssociation(k);
int[] ca = gs.getCharacterArray(false);
for (int i = a.getStart(), e = a.getEnd(); i < e; i++) {
if (isM(ca [ i ])) {
return true;
}
}
return false;
}
private static boolean containsOtherMark(GlyphSequence gs, int k) {
CharAssociation a = gs.getAssociation(k);
int[] ca = gs.getCharacterArray(false);
for (int i = a.getStart(), e = a.getEnd(); i < e; i++) {
switch (typeOf(ca [ i ])) {
case C_T: // tone (e.g., udatta, anudatta)
case C_A: // accent (e.g., acute, grave)
case C_O: // other (e.g., candrabindu, anusvara, visarga, etc)
return true;
default:
break;
}
}
return false;
}
private static class DevanagariSyllabizer extends DefaultSyllabizer {
DevanagariSyllabizer(String script, String language) {
super(script, language);
}
@Override
// | C ...
protected int findStartOfSyllable(int[] ca, int s, int e) {
if ((s < 0) || (s >= e)) {
return -1;
} else {
while (s < e) {
int c = ca [ s ];
if (isC(c)) {
break;
} else {
s++;
}
}
return s;
}
}
@Override
// D* L? | ...
protected int findEndOfSyllable(int[] ca, int s, int e) {
if ((s < 0) || (s >= e)) {
return -1;
} else {
int nd = 0;
int nl = 0;
int i;
// consume dead consonants
while ((i = isDeadConsonant(ca, s, e)) > s) {
s = i;
nd++;
}
// consume zero or one live consonant
if ((i = isLiveConsonant(ca, s, e)) > s) {
s = i;
nl++;
}
return ((nd > 0) || (nl > 0)) ? s : -1;
}
}
// D := ( C N? H )?
private int isDeadConsonant(int[] ca, int s, int e) {
if (s < 0) {
return -1;
} else {
int c;
int i = 0;
int nc = 0;
int nh = 0;
do {
// C
if ((s + i) < e) {
c = ca [ s + i ];
if (isC(c)) {
i++;
nc++;
} else {
break;
}
}
// N?
if ((s + i) < e) {
c = ca [ s + 1 ];
if (isN(c)) {
i++;
}
}
// H
if ((s + i) < e) {
c = ca [ s + i ];
if (isH(c)) {
i++;
nh++;
} else {
break;
}
}
} while (false);
return (nc > 0) && (nh > 0) ? s + i : -1;
}
}
// L := ( (C|V) N? X* )?; where X = ( MATRA | ACCENT MARK | TONE MARK | OTHER MARK )
private int isLiveConsonant(int[] ca, int s, int e) {
if (s < 0) {
return -1;
} else {
int c;
int i = 0;
int nc = 0;
int nv = 0;
int nx = 0;
do {
// C
if ((s + i) < e) {
c = ca [ s + i ];
if (isC(c)) {
i++;
nc++;
} else if (isV(c)) {
i++;
nv++;
} else {
break;
}
}
// N?
if ((s + i) < e) {
c = ca [ s + i ];
if (isN(c)) {
i++;
}
}
// X*
while ((s + i) < e) {
c = ca [ s + i ];
if (isX(c)) {
i++;
nx++;
} else {
break;
}
}
} while (false);
// if no X but has H, then ignore C|I
if (nx == 0) {
if ((s + i) < e) {
c = ca [ s + i ];
if (isH(c)) {
if (nc > 0) {
nc--;
} else if (nv > 0) {
nv--;
}
}
}
}
return ((nc > 0) || (nv > 0)) ? s + i : -1;
}
}
}
// devanagari character types
static final short C_U = 0; // unassigned
static final short C_C = 1; // consonant
static final short C_V = 2; // vowel
static final short C_M = 3; // vowel sign (matra)
static final short C_S = 4; // symbol or sign
static final short C_T = 5; // tone mark
static final short C_A = 6; // accent mark
static final short C_P = 7; // punctuation
static final short C_D = 8; // digit
static final short C_H = 9; // halant (virama)
static final short C_O = 10; // other signs
static final short C_N = 0x0100; // nukta(ized)
static final short C_R = 0x0200; // reph(ized)
static final short C_PRE = 0x0400; // pre-base
static final short C_M_TYPE = 0x00FF; // type mask
static final short C_M_FLAGS = 0x7F00; // flag mask
// devanagari block range
static final int CCA_START = 0x0900; // first code point mapped by cca
static final int CCA_END = 0x0980; // last code point + 1 mapped by cca
// devanagari character type lookups
static final short[] CCA = {
C_O, // 0x0900 // INVERTED CANDRABINDU
C_O, // 0x0901 // CANDRABINDU
C_O, // 0x0902 // ANUSVARA
C_O, // 0x0903 // VISARGA
C_V, // 0x0904 // SHORT A
C_V, // 0x0905 // A
C_V, // 0x0906 // AA
C_V, // 0x0907 // I
C_V, // 0x0908 // II
C_V, // 0x0909 // U
C_V, // 0x090A // UU
C_V, // 0x090B // VOCALIC R
C_V, // 0x090C // VOCALIC L
C_V, // 0x090D // CANDRA E
C_V, // 0x090E // SHORT E
C_V, // 0x090F // E
C_V, // 0x0910 // AI
C_V, // 0x0911 // CANDRA O
C_V, // 0x0912 // SHORT O
C_V, // 0x0913 // O
C_V, // 0x0914 // AU
C_C, // 0x0915 // KA
C_C, // 0x0916 // KHA
C_C, // 0x0917 // GA
C_C, // 0x0918 // GHA
C_C, // 0x0919 // NGA
C_C, // 0x091A // CA
C_C, // 0x091B // CHA
C_C, // 0x091C // JA
C_C, // 0x091D // JHA
C_C, // 0x091E // NYA
C_C, // 0x091F // TTA
C_C, // 0x0920 // TTHA
C_C, // 0x0921 // DDA
C_C, // 0x0922 // DDHA
C_C, // 0x0923 // NNA
C_C, // 0x0924 // TA
C_C, // 0x0925 // THA
C_C, // 0x0926 // DA
C_C, // 0x0927 // DHA
C_C, // 0x0928 // NA
C_C, // 0x0929 // NNNA
C_C, // 0x092A // PA
C_C, // 0x092B // PHA
C_C, // 0x092C // BA
C_C, // 0x092D // BHA
C_C, // 0x092E // MA
C_C, // 0x092F // YA
C_C | C_R, // 0x0930 // RA
C_C | C_R | C_N, // 0x0931 // RRA = 0930+093C
C_C, // 0x0932 // LA
C_C, // 0x0933 // LLA
C_C, // 0x0934 // LLLA
C_C, // 0x0935 // VA
C_C, // 0x0936 // SHA
C_C, // 0x0937 // SSA
C_C, // 0x0938 // SA
C_C, // 0x0939 // HA
C_M, // 0x093A // OE (KASHMIRI)
C_M, // 0x093B // OOE (KASHMIRI)
C_N, // 0x093C // NUKTA
C_S, // 0x093D // AVAGRAHA
C_M, // 0x093E // AA
C_M | C_PRE, // 0x093F // I
C_M, // 0x0940 // II
C_M, // 0x0941 // U
C_M, // 0x0942 // UU
C_M, // 0x0943 // VOCALIC R
C_M, // 0x0944 // VOCALIC RR
C_M, // 0x0945 // CANDRA E
C_M, // 0x0946 // SHORT E
C_M, // 0x0947 // E
C_M, // 0x0948 // AI
C_M, // 0x0949 // CANDRA O
C_M, // 0x094A // SHORT O
C_M, // 0x094B // O
C_M, // 0x094C // AU
C_H, // 0x094D // VIRAMA (HALANT)
C_M, // 0x094E // PRISHTHAMATRA E
C_M, // 0x094F // AW
C_S, // 0x0950 // OM
C_T, // 0x0951 // UDATTA
C_T, // 0x0952 // ANUDATTA
C_A, // 0x0953 // GRAVE
C_A, // 0x0954 // ACUTE
C_M, // 0x0955 // CANDRA LONG E
C_M, // 0x0956 // UE
C_M, // 0x0957 // UUE
C_C | C_N, // 0x0958 // QA
C_C | C_N, // 0x0959 // KHHA
C_C | C_N, // 0x095A // GHHA
C_C | C_N, // 0x095B // ZA
C_C | C_N, // 0x095C // DDDHA
C_C | C_N, // 0x095D // RHA
C_C | C_N, // 0x095E // FA
C_C | C_N, // 0x095F // YYA
C_V, // 0x0960 // VOCALIC RR
C_V, // 0x0961 // VOCALIC LL
C_M, // 0x0962 // VOCALIC RR
C_M, // 0x0963 // VOCALIC LL
C_P, // 0x0964 // DANDA
C_P, // 0x0965 // DOUBLE DANDA
C_D, // 0x0966 // ZERO
C_D, // 0x0967 // ONE
C_D, // 0x0968 // TWO
C_D, // 0x0969 // THREE
C_D, // 0x096A // FOUR
C_D, // 0x096B // FIVE
C_D, // 0x096C // SIX
C_D, // 0x096D // SEVEN
C_D, // 0x096E // EIGHT
C_D, // 0x096F // NINE
C_S, // 0x0970 // ABBREVIATION SIGN
C_S, // 0x0971 // HIGH SPACING DOT
C_V, // 0x0972 // CANDRA A (MARATHI)
C_V, // 0x0973 // OE (KASHMIRI)
C_V, // 0x0974 // OOE (KASHMIRI)
C_V, // 0x0975 // AW (KASHMIRI)
C_V, // 0x0976 // UE (KASHMIRI)
C_V, // 0x0977 // UUE (KASHMIRI)
C_U, // 0x0978 // UNASSIGNED
C_C, // 0x0979 // ZHA
C_C, // 0x097A // HEAVY YA
C_C, // 0x097B // GGAA (SINDHI)
C_C, // 0x097C // JJA (SINDHI)
C_C, // 0x097D // GLOTTAL STOP (LIMBU)
C_C, // 0x097E // DDDA (SINDHI)
C_C // 0x097F // BBA (SINDHI)
};
static int typeOf(int c) {
if ((c >= CCA_START) && (c < CCA_END)) {
return CCA [ c - CCA_START ] & C_M_TYPE;
} else {
return C_U;
}
}
static boolean isType(int c, int t) {
return typeOf(c) == t;
}
static boolean hasFlag(int c, int f) {
if ((c >= CCA_START) && (c < CCA_END)) {
return (CCA [ c - CCA_START ] & f) == f;
} else {
return false;
}
}
static boolean isC(int c) {
return isType(c, C_C);
}
static boolean isR(int c) {
return isType(c, C_C) && hasR(c);
}
static boolean isV(int c) {
return isType(c, C_V);
}
static boolean isN(int c) {
return c == 0x093C;
}
static boolean isH(int c) {
return c == 0x094D;
}
static boolean isM(int c) {
return isType(c, C_M);
}
static boolean isPreM(int c) {
return isType(c, C_M) && hasFlag(c, C_PRE);
}
static boolean isX(int c) {
switch (typeOf(c)) {
case C_M: // matra (combining vowel)
case C_A: // accent mark
case C_T: // tone mark
case C_O: // other (modifying) mark
return true;
default:
return false;
}
}
static boolean hasR(int c) {
return hasFlag(c, C_R);
}
static boolean hasN(int c) {
return hasFlag(c, C_N);
}
}