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|
/*
* Copyright 2003 by Paulo Soares.
*
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
/** Shape arabic characters. This code was converted from a C version
* at www.pango.org.
*
* @author Paulo Soares (psoares@consiste.pt)
*/
public class PangoArabicShapping {
/** Creates a new instance of PangoArabicShapping */
public PangoArabicShapping() {
}
static boolean isVowel(char s) {
return ((s >= 0x064B) && (s <= 0x0655)) || (s == 0x0670);
}
static char charshape(char s, int which)
/* which 0=isolated 1=final 2=initial 3=medial */
{
int l, r, m;
if ((s >= 0x0621) && (s <= 0x06D3)) {
l = 0;
r = chartable.length - 1;
while (l <= r) {
m = (l + r) / 2;
if (s == chartable[m][0]) {
return chartable[m][which + 1];
}
else if (s < chartable[m][0]) {
r = m - 1;
}
else {
l = m + 1;
}
}
}
return s;
}
static int shapecount(char s) {
int l, r, m;
if ((s >= 0x0621) && (s <= 0x06D3) && !isVowel(s)) {
l = 0;
r = chartable.length - 1;
while (l <= r) {
m = (l + r) / 2;
if (s == chartable[m][0]) {
return chartable[m].length - 1;
}
else if (s < chartable[m][0]) {
r = m - 1;
}
else {
l = m + 1;
}
}
}
else if (s == ZWJ) {
return 4;
}
return 1;
}
static int ligature(char newchar, charstruct oldchar) {
/* 0 == no ligature possible; 1 == vowel; 2 == two chars; 3 == Lam+Alef */
int retval = 0;
if (oldchar.basechar == 0)
return 0;
if (isVowel(newchar)) {
retval = 1;
if ((oldchar.vowel != 0) && (newchar != SHADDA)) {
retval = 2; /* we eliminate the old vowel .. */
}
switch (newchar) {
case SHADDA:
if (oldchar.mark1 == 0) {
oldchar.mark1 = SHADDA;
}
else {
return 0; /* no ligature possible */
}
break;
case HAMZABELOW:
switch (oldchar.basechar) {
case ALEF:
oldchar.basechar = ALEFHAMZABELOW;
retval = 2;
break;
case LAM_ALEF:
oldchar.basechar = LAM_ALEFHAMZABELOW;
retval = 2;
break;
default:
oldchar.mark1 = HAMZABELOW;
break;
}
break;
case HAMZAABOVE:
switch (oldchar.basechar) {
case ALEF:
oldchar.basechar = ALEFHAMZA;
retval = 2;
break;
case LAM_ALEF:
oldchar.basechar = LAM_ALEFHAMZA;
retval = 2;
break;
case WAW:
oldchar.basechar = WAWHAMZA;
retval = 2;
break;
case YEH:
case ALEFMAKSURA:
case FARSIYEH:
oldchar.basechar = YEHHAMZA;
retval = 2;
break;
default: /* whatever sense this may make .. */
oldchar.mark1 = HAMZAABOVE;
break;
}
break;
case MADDA:
switch (oldchar.basechar) {
case ALEF:
oldchar.basechar = ALEFMADDA;
retval = 2;
break;
}
break;
default:
oldchar.vowel = newchar;
break;
}
if (retval == 1) {
oldchar.lignum++;
}
return retval;
}
if (oldchar.vowel != 0) { /* if we already joined a vowel, we can't join a Hamza */
return 0;
}
switch (oldchar.basechar) {
case LAM:
switch (newchar) {
case ALEF:
oldchar.basechar = LAM_ALEF;
oldchar.numshapes = 2;
retval = 3;
break;
case ALEFHAMZA:
oldchar.basechar = LAM_ALEFHAMZA;
oldchar.numshapes = 2;
retval = 3;
break;
case ALEFHAMZABELOW:
oldchar.basechar = LAM_ALEFHAMZABELOW;
oldchar.numshapes = 2;
retval = 3;
break;
case ALEFMADDA:
oldchar.basechar = LAM_ALEFMADDA;
oldchar.numshapes = 2;
retval = 3;
break;
}
break;
case 0:
oldchar.basechar = newchar;
oldchar.numshapes = shapecount(newchar);
retval = 1;
break;
}
return retval;
}
static void copycstostring(StringBuffer string, charstruct s, int level) {
/* s is a shaped charstruct; i is the index into the string */
if (s.basechar == 0)
return;
string.append(s.basechar);
(s.lignum)--;
if (s.mark1 != 0) {
if ((level & ar_novowel) == 0) {
string.append(s.mark1);
(s.lignum)--;
}
else {
(s.lignum)--;
}
}
if (s.vowel != 0) {
if ((level & ar_novowel) == 0) {
string.append(s.vowel);
(s.lignum)--;
}
else { /* vowel elimination */
(s.lignum)--;
}
}
// while (s.lignum > 0) { /* NULL-insertion for Langbox-font */
// string[i] = 0;
// i++;
// (s.lignum)--;
// }
// return i;
}
// return len
static void doublelig(StringBuffer string, int level)
/* Ok. We have presentation ligatures in our font. */
{
int len;
int olen = len = string.length();
int j = 0, si = 1;
char lapresult;
while (si < olen) {
lapresult = 0;
if ((level & ar_composedtashkeel) != 0) {
switch (string.charAt(j)) {
case SHADDA:
switch (string.charAt(si)) {
case KASRA:
lapresult = 0xFC62;
break;
case FATHA:
lapresult = 0xFC60;
break;
case DAMMA:
lapresult = 0xFC61;
break;
case 0x064C:
lapresult = 0xFC5E;
break;
case 0x064D:
lapresult = 0xFC5F;
break;
}
break;
case KASRA:
if (string.charAt(si) == SHADDA)
lapresult = 0xFC62;
break;
case FATHA:
if (string.charAt(si) == SHADDA)
lapresult = 0xFC60;
break;
case DAMMA:
if (string.charAt(si) == SHADDA)
lapresult = 0xFC61;
break;
}
}
if ((level & ar_lig) != 0) {
switch (string.charAt(j)) {
case 0xFEDF: /* LAM initial */
switch (string.charAt(si)) {
case 0xFE9E:
lapresult = 0xFC3F;
break; /* JEEM final */
case 0xFEA0:
lapresult = 0xFCC9;
break; /* JEEM medial */
case 0xFEA2:
lapresult = 0xFC40;
break; /* HAH final */
case 0xFEA4:
lapresult = 0xFCCA;
break; /* HAH medial */
case 0xFEA6:
lapresult = 0xFC41;
break; /* KHAH final */
case 0xFEA8:
lapresult = 0xFCCB;
break; /* KHAH medial */
case 0xFEE2:
lapresult = 0xFC42;
break; /* MEEM final */
case 0xFEE4:
lapresult = 0xFCCC;
break; /* MEEM medial */
}
break;
case 0xFE97: /* TEH inital */
switch (string.charAt(si)) {
case 0xFEA0:
lapresult = 0xFCA1;
break; /* JEEM medial */
case 0xFEA4:
lapresult = 0xFCA2;
break; /* HAH medial */
case 0xFEA8:
lapresult = 0xFCA3;
break; /* KHAH medial */
}
break;
case 0xFE91: /* BEH inital */
switch (string.charAt(si)) {
case 0xFEA0:
lapresult = 0xFC9C;
break; /* JEEM medial */
case 0xFEA4:
lapresult = 0xFC9D;
break; /* HAH medial */
case 0xFEA8:
lapresult = 0xFC9E;
break; /* KHAH medial */
}
break;
case 0xFEE7: /* NOON inital */
switch (string.charAt(si)) {
case 0xFEA0:
lapresult = 0xFCD2;
break; /* JEEM initial */
case 0xFEA4:
lapresult = 0xFCD3;
break; /* HAH medial */
case 0xFEA8:
lapresult = 0xFCD4;
break; /* KHAH medial */
}
break;
case 0xFEE8: /* NOON medial */
switch (string.charAt(si)) {
case 0xFEAE:
lapresult = 0xFC8A;
break; /* REH final */
case 0xFEB0:
lapresult = 0xFC8B;
break; /* ZAIN final */
}
break;
case 0xFEE3: /* MEEM initial */
switch (string.charAt(si)) {
case 0xFEA0:
lapresult = 0xFCCE;
break; /* JEEM medial */
case 0xFEA4:
lapresult = 0xFCCF;
break; /* HAH medial */
case 0xFEA8:
lapresult = 0xFCD0;
break; /* KHAH medial */
case 0xFEE4:
lapresult = 0xFCD1;
break; /* MEEM medial */
}
break;
case 0xFED3: /* FEH initial */
switch (string.charAt(si)) {
case 0xFEF2:
lapresult = 0xFC32;
break; /* YEH final */
}
break;
default:
break;
} /* end switch string[si] */
}
if (lapresult != 0) {
string.setCharAt(j, lapresult);
len--;
si++; /* jump over one character */
/* we'll have to change this, too. */
}
else {
j++;
string.setCharAt(j, string.charAt(si));
si++;
}
}
string.setLength(len);
}
static boolean connects_to_left(charstruct a) {
return a.numshapes > 2;
}
static void shape(char text[], StringBuffer string, int level) {
/* string is assumed to be empty and big enough.
* text is the original text.
* This routine does the basic arabic reshaping.
* *len the number of non-null characters.
*
* Note: We have to unshape each character first!
*/
int join;
int which;
char nextletter;
int p = 0; /* initialize for output */
charstruct oldchar = new charstruct();
charstruct curchar = new charstruct();
while (p < text.length) {
nextletter = text[p++];
//nextletter = unshape (nextletter);
join = ligature(nextletter, curchar);
if (join == 0) { /* shape curchar */
int nc = shapecount(nextletter);
//(*len)++;
if (nc == 1) {
which = 0; /* final or isolated */
}
else {
which = 2; /* medial or initial */
}
if (connects_to_left(oldchar)) {
which++;
}
which = which % (curchar.numshapes);
curchar.basechar = charshape(curchar.basechar, which);
/* get rid of oldchar */
copycstostring(string, oldchar, level);
oldchar = curchar; /* new values in oldchar */
/* init new curchar */
curchar = new charstruct();
curchar.basechar = nextletter;
curchar.numshapes = nc;
curchar.lignum++;
// (*len) += unligature (&curchar, level);
}
else if ((join == 3) && (level & ar_lboxfont) != 0) { /* Lam+Alef extra in langbox-font */
curchar.lignum++;
}
else if (join == 1) {
}
// else
// {
// (*len) += unligature (&curchar, level);
// }
// p = g_utf8_next_char (p);
}
/* Handle last char */
if (connects_to_left(oldchar))
which = 1;
else
which = 0;
which = which % (curchar.numshapes);
curchar.basechar = charshape(curchar.basechar, which);
/* get rid of oldchar */
copycstostring(string, oldchar, level);
copycstostring(string, curchar, level);
}
static int arabic_shape(char src[], int srcoffset, int srclength, char dest[], int destoffset, int destlength, int level) {
char str[] = new char[srclength];
for (int k = srclength + srcoffset - 1; k >= srcoffset; --k)
str[k - srcoffset] = src[k];
StringBuffer string = new StringBuffer(srclength);
shape(str, string, level);
if ((level & (ar_composedtashkeel | ar_lig)) != 0)
doublelig(string, level);
// string.reverse();
System.arraycopy(string.toString().toCharArray(), 0, dest, destoffset, string.length());
return string.length();
}
private static final char ALEF = 0x0627;
private static final char ALEFHAMZA = 0x0623;
private static final char ALEFHAMZABELOW = 0x0625;
private static final char ALEFMADDA = 0x0622;
private static final char LAM = 0x0644;
private static final char HAMZA = 0x0621;
private static final char TATWEEL = 0x0640;
private static final char ZWJ = 0x200D;
private static final char HAMZAABOVE = 0x0654;
private static final char HAMZABELOW = 0x0655;
private static final char WAWHAMZA = 0x0624;
private static final char YEHHAMZA = 0x0626;
private static final char WAW = 0x0648;
private static final char ALEFMAKSURA = 0x0649;
private static final char YEH = 0x064A;
private static final char FARSIYEH = 0x06CC;
private static final char SHADDA = 0x0651;
private static final char KASRA = 0x0650;
private static final char FATHA = 0x064E;
private static final char DAMMA = 0x064F;
private static final char MADDA = 0x0653;
private static final char LAM_ALEF = 0xFEFB;
private static final char LAM_ALEFHAMZA = 0xFEF7;
private static final char LAM_ALEFHAMZABELOW = 0xFEF9;
private static final char LAM_ALEFMADDA = 0xFEF5;
private static final char chartable[][] = {
{0x0621, 0xFE80}, /* HAMZA */
{0x0622, 0xFE81, 0xFE82}, /* ALEF WITH MADDA ABOVE */
{0x0623, 0xFE83, 0xFE84}, /* ALEF WITH HAMZA ABOVE */
{0x0624, 0xFE85, 0xFE86}, /* WAW WITH HAMZA ABOVE */
{0x0625, 0xFE87, 0xFE88}, /* ALEF WITH HAMZA BELOW */
{0x0626, 0xFE89, 0xFE8A, 0xFE8B, 0xFE8C}, /* YEH WITH HAMZA ABOVE */
{0x0627, 0xFE8D, 0xFE8E}, /* ALEF */
{0x0628, 0xFE8F, 0xFE90, 0xFE91, 0xFE92}, /* BEH */
{0x0629, 0xFE93, 0xFE94}, /* TEH MARBUTA */
{0x062A, 0xFE95, 0xFE96, 0xFE97, 0xFE98}, /* TEH */
{0x062B, 0xFE99, 0xFE9A, 0xFE9B, 0xFE9C}, /* THEH */
{0x062C, 0xFE9D, 0xFE9E, 0xFE9F, 0xFEA0}, /* JEEM */
{0x062D, 0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4}, /* HAH */
{0x062E, 0xFEA5, 0xFEA6, 0xFEA7, 0xFEA8}, /* KHAH */
{0x062F, 0xFEA9, 0xFEAA}, /* DAL */
{0x0630, 0xFEAB, 0xFEAC}, /* THAL */
{0x0631, 0xFEAD, 0xFEAE}, /* REH */
{0x0632, 0xFEAF, 0xFEB0}, /* ZAIN */
{0x0633, 0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4}, /* SEEN */
{0x0634, 0xFEB5, 0xFEB6, 0xFEB7, 0xFEB8}, /* SHEEN */
{0x0635, 0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC}, /* SAD */
{0x0636, 0xFEBD, 0xFEBE, 0xFEBF, 0xFEC0}, /* DAD */
{0x0637, 0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4}, /* TAH */
{0x0638, 0xFEC5, 0xFEC6, 0xFEC7, 0xFEC8}, /* ZAH */
{0x0639, 0xFEC9, 0xFECA, 0xFECB, 0xFECC}, /* AIN */
{0x063A, 0xFECD, 0xFECE, 0xFECF, 0xFED0}, /* GHAIN */
{0x0640, 0x0640, 0x0640, 0x0640, 0x0640}, /* TATWEEL */
{0x0641, 0xFED1, 0xFED2, 0xFED3, 0xFED4}, /* FEH */
{0x0642, 0xFED5, 0xFED6, 0xFED7, 0xFED8}, /* QAF */
{0x0643, 0xFED9, 0xFEDA, 0xFEDB, 0xFEDC}, /* KAF */
{0x0644, 0xFEDD, 0xFEDE, 0xFEDF, 0xFEE0}, /* LAM */
{0x0645, 0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4}, /* MEEM */
{0x0646, 0xFEE5, 0xFEE6, 0xFEE7, 0xFEE8}, /* NOON */
{0x0647, 0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC}, /* HEH */
{0x0648, 0xFEED, 0xFEEE}, /* WAW */
{0x0649, 0xFEEF, 0xFEF0, 0xFBE8, 0xFBE9}, /* ALEF MAKSURA */
{0x064A, 0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4}, /* YEH */
{0x0671, 0xFB50, 0xFB51}, /* ALEF WASLA */
{0x0679, 0xFB66, 0xFB67, 0xFB68, 0xFB69}, /* TTEH */
{0x067A, 0xFB5E, 0xFB5F, 0xFB60, 0xFB61}, /* TTEHEH */
{0x067B, 0xFB52, 0xFB53, 0xFB54, 0xFB55}, /* BEEH */
{0x067E, 0xFB56, 0xFB57, 0xFB58, 0xFB59}, /* PEH */
{0x067F, 0xFB62, 0xFB63, 0xFB64, 0xFB65}, /* TEHEH */
{0x0680, 0xFB5A, 0xFB5B, 0xFB5C, 0xFB5D}, /* BEHEH */
{0x0683, 0xFB76, 0xFB77, 0xFB78, 0xFB79}, /* NYEH */
{0x0684, 0xFB72, 0xFB73, 0xFB74, 0xFB75}, /* DYEH */
{0x0686, 0xFB7A, 0xFB7B, 0xFB7C, 0xFB7D}, /* TCHEH */
{0x0687, 0xFB7E, 0xFB7F, 0xFB80, 0xFB81}, /* TCHEHEH */
{0x0688, 0xFB88, 0xFB89}, /* DDAL */
{0x068C, 0xFB84, 0xFB85}, /* DAHAL */
{0x068D, 0xFB82, 0xFB83}, /* DDAHAL */
{0x068E, 0xFB86, 0xFB87}, /* DUL */
{0x0691, 0xFB8C, 0xFB8D}, /* RREH */
{0x0698, 0xFB8A, 0xFB8B}, /* JEH */
{0x06A4, 0xFB6A, 0xFB6B, 0xFB6C, 0xFB6D}, /* VEH */
{0x06A6, 0xFB6E, 0xFB6F, 0xFB70, 0xFB71}, /* PEHEH */
{0x06A9, 0xFB8E, 0xFB8F, 0xFB90, 0xFB91}, /* KEHEH */
{0x06AD, 0xFBD3, 0xFBD4, 0xFBD5, 0xFBD6}, /* NG */
{0x06AF, 0xFB92, 0xFB93, 0xFB94, 0xFB95}, /* GAF */
{0x06B1, 0xFB9A, 0xFB9B, 0xFB9C, 0xFB9D}, /* NGOEH */
{0x06B3, 0xFB96, 0xFB97, 0xFB98, 0xFB99}, /* GUEH */
{0x06BB, 0xFBA0, 0xFBA1, 0xFBA2, 0xFBA3}, /* RNOON */
{0x06BE, 0xFBAA, 0xFBAB, 0xFBAC, 0xFBAD}, /* HEH DOACHASHMEE */
{0x06C0, 0xFBA4, 0xFBA5}, /* HEH WITH YEH ABOVE */
{0x06C1, 0xFBA6, 0xFBA7, 0xFBA8, 0xFBA9}, /* HEH GOAL */
{0x06C5, 0xFBE0, 0xFBE1}, /* KIRGHIZ OE */
{0x06C6, 0xFBD9, 0xFBDA}, /* OE */
{0x06C7, 0xFBD7, 0xFBD8}, /* U */
{0x06C8, 0xFBDB, 0xFBDC}, /* YU */
{0x06C9, 0xFBE2, 0xFBE3}, /* KIRGHIZ YU */
{0x06CB, 0xFBDE, 0xFBDF}, /* VE */
{0x06CC, 0xFBFC, 0xFBFD, 0xFBFE, 0xFBFF}, /* FARSI YEH */
{0x06D0, 0xFBE4, 0xFBE5, 0xFBE6, 0xFBE7}, /* E */
{0x06D2, 0xFBAE, 0xFBAF}, /* YEH BARREE */
{0x06D3, 0xFBB0, 0xFBB1} /* YEH BARREE WITH HAMZA ABOVE */
};
static final int ar_nothing = 0x0;
static final int ar_novowel = 0x1;
static final int ar_standard = 0x2;
static final int ar_composedtashkeel = 0x4;
static final int ar_lig = 0x8;
static final int ar_mulefont = 0x10;
static final int ar_lboxfont = 0x20;
static final int ar_unifont = 0x40;
static final int ar_naqshfont = 0x80;
static class charstruct {
char basechar;
char mark1; /* has to be initialized to zero */
char vowel;
int lignum; /* is a ligature with lignum aditional characters */
int numshapes = 1;
};
}
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