| /* |
| * 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>TamilScriptProcessor</code> class implements a script processor for |
| * performing glyph substitution and positioning operations on content associated with the Tamil script.</p> |
| * |
| * <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p> |
| */ |
| public class TamilScriptProcessor extends IndicScriptProcessor { |
| |
| /** logging instance */ |
| private static final Log log = LogFactory.getLog(TamilScriptProcessor.class); |
| |
| TamilScriptProcessor(String script) { |
| super(script); |
| } |
| |
| @Override |
| protected Class<? extends TamilSyllabizer> getSyllabizerClass() { |
| return TamilSyllabizer.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 TamilSyllabizer extends DefaultSyllabizer { |
| TamilSyllabizer(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; |
| } |
| } |
| } |
| |
| // tamil 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_POST = 0x1000; // post-base |
| static final short C_WRAP = C_PRE | C_POST; // wrap (two part) vowel |
| static final short C_M_TYPE = 0x00FF; // type mask |
| static final short C_M_FLAGS = 0x7F00; // flag mask |
| // tamil block range |
| static final int CCA_START = 0x0B80; // first code point mapped by cca |
| static final int CCA_END = 0x0C00; // last code point + 1 mapped by cca |
| // tamil character type lookups |
| static final short[] CCA = { |
| C_U, // 0x0B80 // |
| C_U, // 0x0B81 // |
| C_O, // 0x0B82 // ANUSVARA |
| C_O, // 0x0B83 // VISARGA |
| C_U, // 0x0B84 // |
| C_V, // 0x0B85 // A |
| C_V, // 0x0B86 // AA |
| C_V, // 0x0B87 // I |
| C_V, // 0x0B88 // II |
| C_V, // 0x0B89 // U |
| C_V, // 0x0B8A // UU |
| C_U, // 0x0B8B // |
| C_U, // 0x0B8C // |
| C_U, // 0x0B8D // |
| C_V, // 0x0B8E // E |
| C_V, // 0x0B8F // EE |
| C_V, // 0x0B90 // AI |
| C_U, // 0x0B91 // |
| C_V, // 0x0B92 // O |
| C_V, // 0x0B93 // OO |
| C_V, // 0x0B94 // AU |
| C_C, // 0x0B95 // KA |
| C_U, // 0x0B96 // |
| C_U, // 0x0B97 // |
| C_U, // 0x0B98 // |
| C_C, // 0x0B99 // NGA |
| C_C, // 0x0B9A // CA |
| C_U, // 0x0B9B // |
| C_C, // 0x0B9C // JA |
| C_U, // 0x0B9D // |
| C_C, // 0x0B9E // NYA |
| C_C, // 0x0B9F // TTA |
| C_U, // 0x0BA0 // |
| C_U, // 0x0BA1 // |
| C_U, // 0x0BA2 // |
| C_C, // 0x0BA3 // NNA |
| C_C, // 0x0BA4 // TA |
| C_U, // 0x0BA5 // |
| C_U, // 0x0BA6 // |
| C_U, // 0x0BA7 // |
| C_C, // 0x0BA8 // NA |
| C_C, // 0x0BA9 // NNNA |
| C_C, // 0x0BAA // PA |
| C_U, // 0x0BAB // |
| C_U, // 0x0BAC // |
| C_U, // 0x0BAD // |
| C_C, // 0x0BAE // MA |
| C_C, // 0x0BAF // YA |
| C_C | C_R, // 0x0BB0 // RA |
| C_C | C_R, // 0x0BB1 // RRA |
| C_C, // 0x0BB2 // LA |
| C_C, // 0x0BB3 // LLA |
| C_C, // 0x0BB4 // LLLA |
| C_C, // 0x0BB5 // VA |
| C_C, // 0x0BB6 // SHA |
| C_C, // 0x0BB7 // SSA |
| C_C, // 0x0BB8 // SA |
| C_C, // 0x0BB9 // HA |
| C_U, // 0x0BBA // |
| C_U, // 0x0BBB // |
| C_U, // 0x0BBC // |
| C_U, // 0x0BBD // |
| C_M, // 0x0BBE // AA |
| C_M, // 0x0BBF // I |
| C_M, // 0x0BC0 // II |
| C_M, // 0x0BC1 // U |
| C_M, // 0x0BC2 // UU |
| C_U, // 0x0BC3 // |
| C_U, // 0x0BC4 // |
| C_U, // 0x0BC5 // |
| C_M | C_PRE, // 0x0BC6 // E |
| C_M | C_PRE, // 0x0BC7 // EE |
| C_M | C_PRE, // 0x0BC8 // AI |
| C_U, // 0x0BC9 // |
| C_M | C_WRAP, // 0x0BCA // O |
| C_M | C_WRAP, // 0x0BCB // OO |
| C_M | C_WRAP, // 0x0BCC // AU |
| C_H, // 0x0BCD // VIRAMA (HALANT) |
| C_U, // 0x0BCE // |
| C_U, // 0x0BCF // |
| C_S, // 0x0BD0 // OM |
| C_U, // 0x0BD1 // |
| C_U, // 0x0BD2 // |
| C_U, // 0x0BD3 // |
| C_U, // 0x0BD4 // |
| C_U, // 0x0BD5 // |
| C_U, // 0x0BD6 // |
| C_M, // 0x0BD7 // AU LENGTH MARK |
| C_U, // 0x0BD8 // |
| C_U, // 0x0BD9 // |
| C_U, // 0x0BDA // |
| C_U, // 0x0BDB // |
| C_U, // 0x0BDC // |
| C_U, // 0x0BDD // |
| C_U, // 0x0BDE // |
| C_U, // 0x0BDF // |
| C_U, // 0x0BE0 // |
| C_U, // 0x0BE1 // |
| C_U, // 0x0BE2 // |
| C_U, // 0x0BE3 // |
| C_U, // 0x0BE4 // |
| C_U, // 0x0BE5 // |
| C_D, // 0x0BE6 // ZERO |
| C_D, // 0x0BE7 // ONE |
| C_D, // 0x0BE8 // TWO |
| C_D, // 0x0BE9 // THREE |
| C_D, // 0x0BEA // FOUR |
| C_D, // 0x0BEB // FIVE |
| C_D, // 0x0BEC // SIX |
| C_D, // 0x0BED // SEVEN |
| C_D, // 0x0BEE // EIGHT |
| C_D, // 0x0BEF // NINE |
| C_S, // 0x0BF0 // TEN |
| C_S, // 0x0BF1 // ONE HUNDRED |
| C_S, // 0x0BF2 // ONE THOUSAND |
| C_S, // 0x0BF3 // DAY SIGN (naal) |
| C_S, // 0x0BF4 // MONTH SIGN (maatham) |
| C_S, // 0x0BF5 // YEAR SIGN (varudam) |
| C_S, // 0x0BF6 // DEBIT SIGN (patru) |
| C_S, // 0x0BF7 // CREDIT SIGN (varavu) |
| C_S, // 0x0BF8 // AS ABOVE SIGN (merpadi) |
| C_S, // 0x0BF9 // RUPEE SIGN (rupai) |
| C_S, // 0x0BFA // NUMBER SIGN (enn) |
| C_U, // 0x0BFB // |
| C_U, // 0x0BFC // |
| C_U, // 0x0BFD // |
| C_U, // 0x0BFE // |
| C_U // 0x0BFF // |
| }; |
| 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); |
| } |
| |
| } |
