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/* This is part of Pango - Arabic shaping module
*
* (C) 2000 Karl Koehler<koehler@or.uni-bonn.de>
*
* Note : The book "The Unicode Standard Version 3.0" is not very helpful
* regarding arabic, so I implemented this according to my own best
* knowledge. Bad examples from the book are 'ALEF.LAM'-ligature,
* ( one also sais fi-ligature, not if-ligature ) and HAMZA handling.
* There is only _one_ letter HAMZA, and so four (!) forms of HAMZA in
* the basic section seem .. strange ( maybe I just have not understood
* the sense of them, though ).
*/
#include "arconv.h"
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#endif
typedef struct {
GUChar4 basechar;
GUChar4 charstart;
int count;
} shapestruct;
typedef struct {
GUChar4 basechar;
GUChar4 mark1; /* has to be initialized to zero */
GUChar4 vowel; /* */
char connecttoleft;
signed char lignum; /* is a ligature with lignum aditional characters */
char numshapes;
} charstruct;
/* The Unicode order is always: Standalone End Beginning Middle */
static shapestruct chartable [] =
{
{0x621, 0xFE80,4}, /* HAMZA; handle seperately !!! */
{0x622, 0xFE81,2}, /* ALIF MADDA */
{0x623, 0xFE83,2}, /* ALIF HAMZA */
{0x624, 0xFE85,2}, /* WAW HAMZA */
{0x625, 0xFE87,2}, /* ALIF IHAMZA */
{0x626, 0xFE89,4}, /* YA HAMZA */
{0x627, 0xFE8D,2}, /* ALIF */
{0x628, 0xFE8F,4}, /* BA */
{0x629, 0xFE93,2}, /* TA MARBUTA */
{0x62A, 0xFE95,4}, /* TA */
{0x62B, 0xFE99,4}, /* THA */
{0x62C, 0xFE9D,4}, /* DJIM */
{0x62D, 0xFEA1,4}, /* HA */
{0x62E, 0xFEA5,4}, /* CHA */
{0x62F, 0xFEA9,2}, /* DAL */
{0x630, 0xFEAB,2}, /* THAL */
{0x631, 0xFEAD,2}, /* RA */
{0x632, 0xFEAF,2}, /* ZAY */
{0x633, 0xFEB1,4}, /* SIN */
{0x634, 0xFEB5,4}, /* SHIN */
{0x635, 0xFEB9,4}, /* SAAD */
{0x636, 0xFEBD,4}, /* DAAD */
{0x637, 0xFEC1,4}, /* .TA */
{0x638, 0xFEC5,4}, /* .ZA */
{0x639, 0xFEC9,4}, /* AIN */
{0x63A, 0xFECD,4}, /* RAIN */
{0x63B, 0x0000,0}, /* : */
{0x63C, 0x0000,0}, /* epmty for */
{0x63D, 0x0000,0}, /* simple */
{0x63E, 0x0000,0}, /* indexing */
{0x63F, 0x0000,0}, /* : */
{0x640, 0x0640,1}, /* */
{0x641, 0xFED1,4}, /* FA */
{0x642, 0xFED5,4}, /* QAF */
{0x643, 0xFED9,4}, /* KAF */
{0x644, 0xFEDD,4}, /* LAM */
{0x645, 0xFEE1,4}, /* MIM */
{0x646, 0xFEE5,4}, /* NUN */
{0x647, 0xFEE9,4}, /* HA */
{0x648, 0xFEED,2}, /* WAW */
{0x649, 0xFEEF,2}, /* ALIF MAQSURA */
{0x64A, 0xFEF1,4}, /* YA */
/* The following are letters are not plain arabic */
/* some of the coding does not preserve order ... */
{0x679, 0xFB66,4}, /* Urdu:TTEH */
{0x67B, 0xFB52,4}, /* Sindhi: */
{0x67E, 0xFB56,4}, /* PEH: latin compatibility */
{0x680, 0xFB62,4}, /* Sindhi: */
{0x683, 0xFB86,4}, /* " */
{0x684, 0xFB72,4}, /* " */
{0x686, 0xFB7A,4}, /* Persian: Tcheh */
{0x687, 0xFB7E,4}, /* Sindhi: */
{0x68C, 0xFB84,2}, /* Sindhi: DAHAL */
{0x68D, 0xFB82,2}, /* Sindhi */
{0x68E, 0xFB86,2}, /* */
{0x691, 0xFB8C,2}, /* Urdu */
{0x698, 0xFB8A,2}, /* Persian: JEH */
{0x6A4, 0xFB6A,4}, /* VEH: latin compatibility */
{0x6A6, 0xFB6E,4}, /* Sindhi */
{0x6A9, 0xFB8E,4}, /* Persan K */
{0x6AA, 0xFB8E,4}, /* extrawide KAF-> Persian KAF */
{0x6AF, 0xFB92,4}, /* Persian: GAF */
{0x6B1, 0xFB9A,4}, /* Sindhi: */
{0x6B3, 0xFB97,4}, /* */
{0x6BA, 0xFB9E,2}, /* Urdu:NUN GHUNNA */
{0x6BB, 0xFBA0,4}, /* Sindhi: */
{0x6BE, 0xFBAA,4}, /* HA special */
{0x6C0, 0xFBA4,2}, /* izafet: HA HAMZA */
{0x6C1, 0xFBA6,4}, /* Urdu: */
{0x6D2, 0xFBAE,2}, /* YA barree */
{0x6D3, 0xFBB0,2}, /* YA BARREE HAMZA */
{0xFEF5, 0xFEF5,2}, /* Lam-Alif Madda */
{0xFEF7, 0xFEF7,2}, /* Lam-Alif Hamza */
{0xFEF9, 0xFEF9,2}, /* Lam-Alif iHamza */
{0xFEFB, 0xFEFB,2} /* Lam-Alif */
};
#define ALIF 0x627
#define ALIFHAMZA 0x623
#define ALIFIHAMZA 0x625
#define ALIFMADDA 0x622
#define LAM 0x644
#define HAMZA 0x621
/* Hmaza below ( saves Kasra and special cases ), Hamza above ( always joins ).
* As I don't know what sHAMZA is good for I don't handle it.
*/
#define iHAMZA 0x654
#define aHAMZA 0x655
#define sHAMZA 0x674
#define WAW 0x648
#define WAWHAMZA 0x624
#define SHADDA 0x651
#define KASRA 0x650
#define FATHA 0x64E
#define DAMMA 0x64F
#define LAM_ALIF 0xFEFB
#define LAM_ALIFHAMZA 0xFEF7
#define LAM_ALIFIHAMZA 0xFEF9
#define LAM_ALIFMADDA 0xFEF5
void
charstruct_init(charstruct* s)
{
s->basechar = 0;
s->mark1 = 0;
s->vowel = 0;
s->connecttoleft = 0;
s->lignum = 0;
s->numshapes = 0;
}
void
copycstostring(GUChar4* string,int* i,charstruct* s,int level)
{ /* s is a shaped charstruct; i is the index into the string */
if (s->basechar == 0) return;
string[*i] = s->basechar; (*i)--; (s->lignum)--;
if (s->mark1 != 0)
{
string[*i] = s->mark1; (*i)--; (s->lignum)--;
}
if (s->vowel != 0)
{
if (level > 1)
{
string[*i] = s->vowel; (*i)--; (s->lignum)--;
}
else
{ /* vowel elimination */
string[*i] = 0; (*i)--; (s->lignum)--;
}
}
while (s->lignum > 0 )
{
string[*i] = 0; (*i)--; (s->lignum)--;
}
#ifdef DEBUG
if (*i < -1){
fprintf(stderr,"you are in trouble ! i = %i, the last char is %x, "
"lignum = %i",
*i,s->basechar,s->lignum);
}
#endif
}
int
arabic_isvowel(GUChar4 s)
{ /* is this 'joining HAMZA' ( strange but has to be handled like a vowel )
* Kasra, Fatha, Damma, Sukun ?
*/
if ((s >= 0x64B) && (s <= 0x655)) return 1;
if ((s >= 0xFC5E) && (s <= 0xFC63)) return 1;
if ((s >= 0xFE70) && (s <= 0xFE7F)) return 1;
return 0;
}
static GUChar4
unshape(GUChar4 s)
{
int j = 0;
if ( (s > 0xFE80) && ( s < 0xFEFF ))
{ /* arabic shaped Glyph , not HAMZA */
while ( chartable[j+1].charstart <= s) j++;
return chartable[j].basechar;
}
else if ((s == 0xFE8B)||(s == 0xFE8C))
{
return HAMZA;
}
else
{
return s;
}
}
static GUChar4
charshape(GUChar4 s,short which)
{ /* which 0=alone 1=end 2=start 3=middle */
int j = 0;
if ((s >= chartable[1].basechar) && (s <= 0x64A))
{ /* basic character */
return chartable[s-chartable[0].basechar].charstart+which;
}
else if ( (s >= chartable[1].basechar) && ( s <= 0xFEFB ))
{ /* special char or Lam-Alif */
while ( chartable[j].basechar < s) j++;
return chartable[j].charstart+which;
}
else if (s == HAMZA)
{
if (which < 2) return s;
else return 0xFE8B+(which-2); /* The Hamza-'pod' */
}
else
{
return s;
}
}
static short
shapecount(GUChar4 s)
{
int j = 0;
if (arabic_isvowel(s))
{ /* correct trailing wovels */
return 1;
}
else if ((s >= chartable[1].basechar) && ( s <= 0x64A ))
{ /* basic character */
return chartable[s-chartable[0].basechar].count;
}
else if ( (s >= chartable[0].basechar) && ( s <= 0xFEFB ))
{
/* arabic base char or ligature */
while ( chartable[j].basechar < s) j++;
return chartable[j].count;
}
else
{
return 1;
}
}
int
ligature(GUChar4* string,int si,int len,charstruct* oldchar)
{ /* no ligature possible --> return 0; 1 == vowel; 2 = two chars */
int retval = 0;
GUChar4 newchar = string[si];
if (arabic_isvowel(newchar))
{
retval = 1;
switch(newchar)
{
case SHADDA: oldchar->mark1 = newchar; break;
case iHAMZA:
switch(oldchar->basechar)
{
case ALIF:
oldchar->basechar = ALIFIHAMZA;
retval = 2; break;
case LAM_ALIF:
oldchar->basechar = LAM_ALIFIHAMZA;
retval = 2; break;
default: oldchar->mark1 = newchar; break;
}
break;
case aHAMZA:
switch(oldchar->basechar)
{
case ALIF:
oldchar->basechar = ALIFHAMZA;
retval = 2; break;
case LAM_ALIF:
oldchar->basechar = LAM_ALIFHAMZA;
retval = 2; break;
case WAW:
oldchar->basechar = WAWHAMZA;
retval = 2; break;
default: /* whatever sense this may make .. */
oldchar->mark1 = newchar; break;
}
break;
case KASRA:
switch(oldchar->basechar)
{
case ALIFHAMZA:
oldchar->basechar = ALIFIHAMZA;
retval = 2; break;
case LAM_ALIFHAMZA:
oldchar->basechar = LAM_ALIFIHAMZA;
retval = 2; break;
default: oldchar->vowel = newchar; break;
}
break;
default: oldchar->vowel = newchar; break;
}
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 ALIF: oldchar->basechar = LAM_ALIF;
oldchar->numshapes = 2; retval = 3; break;
case ALIFHAMZA: oldchar->basechar = LAM_ALIFHAMZA;
oldchar->numshapes = 2; retval = 3; break;
case ALIFIHAMZA:oldchar->basechar = LAM_ALIFIHAMZA;
oldchar->numshapes = 2; retval = 3; break;
case ALIFMADDA: oldchar->basechar = LAM_ALIFMADDA ;
oldchar->numshapes = 2; retval = 3; break;
}
break;
case ALIF:
switch (newchar)
{
case ALIF: oldchar->basechar = ALIFMADDA; retval = 2; break;
case HAMZA:
if (si == len-2) /* HAMZA is 2nd char */
{
oldchar->basechar = ALIFHAMZA; retval = 2;
}
break;
}
break;
case WAW:
switch (newchar)
{
case HAMZA:oldchar->basechar = WAWHAMZA; retval = 2; break;
}
break;
case LAM_ALIF:
switch (newchar)
{
case HAMZA:
if (si == len-4) /* ! We assume the string has been split
into words. This is AL-A.. I hope */
{
oldchar->basechar = LAM_ALIFHAMZA; retval = 2;
}
break;
}
break;
case 0:
oldchar->basechar = newchar;
oldchar->numshapes = shapecount(newchar);
retval = 1;
break;
}
if (retval)
{
oldchar->lignum++;
#ifdef DEBUG
fprintf(stderr,"[ar] ligature : added %x to make %x\n",
newchar,oldchar->basechar);
#endif
}
return retval;
}
static void
shape(int olen,int* len,GUChar4* string,int level)
{
/* The string must be in visual order already.
** This routine does the basic arabic reshaping.
** olen is the memory lenght, *len the number of non-null characters.
*/
charstruct oldchar,curchar;
int si = (olen)-1;
int j = (olen)-1;
int join;
int which;
*len = olen;
charstruct_init(&oldchar);
charstruct_init(&curchar);
while (si >= 0)
{
join = ligature(string,si,olen,&curchar);
if (!join)
{ /* shape curchar */
int nc = shapecount(string[si]);
if (nc == 1)
{
which = 0; /* end or basic */
}
else
{
which = 2; /* middle or beginning */
}
if (oldchar.connecttoleft) which++;
which = which % (curchar.numshapes);
curchar.basechar = charshape(curchar.basechar,which);
if (curchar.numshapes > 2)
curchar.connecttoleft = 1;
/* get rid of oldchar */
copycstostring(string,&j,&oldchar,level);
oldchar = curchar; /* new vlues in oldchar */
/* init new curchar */
charstruct_init(&curchar);
curchar.basechar = string[si];
curchar.numshapes = nc;
curchar.lignum++;
}
else if ( ( join == 2 )
||((join == 3)&&(level != 2)) )
{ /* Lam-Alif in Langbox-font is no ligature */
(*len)--;
}
si--;
}
/* Handle last char */
if (oldchar.connecttoleft)
which = 1;
else
which = 0;
which = which % (curchar.numshapes);
curchar.basechar = charshape(curchar.basechar,which);
/* get rid of oldchar */
copycstostring(string,&j,&oldchar,level);
copycstostring(string,&j,&curchar,level);
#ifdef DEBUG
fprintf(stderr,"[ar] shape statistic: %i chars -> %i glyphs \n",
olen,*len);
#endif
}
static void
doublelig(int olen,int* len,GUChar4* string,int level)
{ /* Ok. We have presentation ligatures in our font. */
int si = (olen)-1;
GUChar4 lapresult;
while (si > 0)
{
lapresult = 0;
switch(string[si])
{
case SHADDA:
switch(string[si-1])
{
case KASRA: lapresult = 0xFC62; break;
case FATHA: lapresult = 0xFC60; break;
case DAMMA: lapresult = 0xFC61; break;
case 0x64C: lapresult = 0xFC5E; break;
case 0x64D: lapresult = 0xFC5F; break;
}
break;
case KASRA:
if (string[si-1]==SHADDA) lapresult = 0xFC62;
break;
case FATHA:
if (string[si-1]==SHADDA) lapresult = 0xFC60;
break;
case DAMMA:
if (string[si-1]==SHADDA) lapresult = 0xFC61;
break;
case 0xFEDF: /* LAM initial */
if (level > 13){
switch(string[si-1]){
case 0xFE9E : lapresult = 0xFC3F; break; /* DJEEM final*/
case 0xFEA0 : lapresult = 0xFCC9; break;
case 0xFEA2 : lapresult = 0xFC40; break; /* .HA final */
case 0xFEA4 : lapresult = 0xFCCA; break;
case 0xFEA6 : lapresult = 0xFCF1; break; /* CHA final */
case 0xFEA8 : lapresult = 0xFCCB; break;
case 0xFEE2 : lapresult = 0xFC42; break; /* MIM final */
case 0xFEE4 : lapresult = 0xFCCC; break;
}
}
break;
case 0xFE97: /* TA inital */
if (level > 13){
switch(string[si-1]){
case 0xFEA0 : lapresult = 0xFCA1; break; /* DJ init */
case 0xFEA4 : lapresult = 0xFCA2; break; /* .HA */
case 0xFEA8 : lapresult = 0xFCA3; break; /* CHA */
}
}
break;
case 0xFE91: /* BA inital */
if (level > 13){
switch(string[si-1]){
case 0xFEA0 : lapresult = 0xFC9C; break; /* DJ init */
case 0xFEA4 : lapresult = 0xFC9D; break; /* .HA */
case 0xFEA8 : lapresult = 0xFC9E; break; /* CHA */
}
}
break;
case 0xFEE7: /* NUN inital */
if (level > 13) {
switch(string[si-1]){
case 0xFEA0 : lapresult = 0xFCD2; break; /* DJ init */
case 0xFEA4 : lapresult = 0xFCD3; break; /* .HA */
case 0xFEA8 : lapresult = 0xFCD4; break; /* CHA */
}
}
break;
default:
break;
} /* end switch string[si] */
if (lapresult != 0)
{
string[si] = lapresult; (*len)--; string[si-1] = 0x0;
}
si--;
}
}
void
arabic_reshape(int* len,GUChar4* string,int level)
{
int i;
int olen = *len;
for ( i = 0; i < *len; i++){
string[i] = unshape(string[i]);
}
shape(olen,len,string,level);
if (level > 10)
doublelig(olen,len,string,level);
}
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