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/*
** Arabtype Copyright 2012-2013(c) Wael El Oraiby. All Rights Reserved
** see README.md file for license
*/
#include <stdbool.h>
#include "utf8.h"
#include "arabtype.h"
#define ARABIC_LETTER_START 0x621
#define ARABIC_LETTER_END 0x64A
#define ISOLATED 0
#define ENDING 1
#define INITIAL 2
#define MEDIAL 3
//
// 0: isolated form
// 1: ending form
// 2: beginning form (if 0, it's a cutting type)
// 3: middle form
//
typedef uint32_t char_form[4];
char_form arabic_forms_b[] =
{
{0xFE80, 0xFE80, 0, 0}, // hamza (0)
{0xFE81, 0xFE82, 0, 0}, // 2alif madda (1)
{0xFE83, 0xFE84, 0, 0}, // 2alif hamza (2)
{0xFE85, 0xFE86, 0, 0}, // waw hamza (3)
{0xFE87, 0xFE88, 0, 0}, // 2alif hamza maksoura (4)
{0xFE89, 0xFE8A, 0xFE8B, 0xFE8C}, // 2alif maqsoura hamza (5)
{0xFE8D, 0xFE8E, 0, 0}, // 2alif (6)
{0xFE8F, 0xFE90, 0xFE91, 0xFE92}, // ba2 (7)
{0xFE93, 0xFE94, 0, 0}, // ta2 marbouta (8)
{0xFE95, 0xFE96, 0xFE97, 0xFE98}, // ta2 (9)
{0xFE99, 0xFE9A, 0xFE9B, 0xFE9C}, // tha2 (10)
{0xFE9D, 0xFE9E, 0xFE9F, 0xFEA0}, // jim (11)
{0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4}, // 7a2 (12)
{0xFEA5, 0xFEA6, 0xFEA7, 0xFEA8}, // kha2 (13)
{0xFEA9, 0xFEAA, 0, 0}, // dal (14)
{0xFEAB, 0xFEAC, 0, 0}, // dhal (15)
{0xFEAD, 0xFEAE, 0, 0}, // ra2 (16)
{0xFEAF, 0xFEB0, 0, 0}, // zayn (17)
{0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4}, // syn (18)
{0xFEB5, 0xFEB6, 0xFEB7, 0xFEB8}, // shin (19)
{0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC}, // sad (20)
{0xFEBD, 0xFEBE, 0xFEBF, 0xFEC0}, // dad (21)
{0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4}, // tah (22)
{0xFEC5, 0xFEC6, 0xFEC7, 0xFEC8}, // thah (23)
{0xFEC9, 0xFECA, 0xFECB, 0xFECC}, // 3ayn (24)
{0xFECD, 0xFECE, 0xFECF, 0xFED0}, // ghayn (25)
{0, 0, 0, 0}, // (26)
{0, 0, 0, 0}, // (27)
{0, 0, 0, 0}, // (28)
{0, 0, 0, 0}, // (29)
{0, 0, 0, 0}, // (30)
{0x640, 0x640, 0x640, 0x640}, // wasla (31)
{0xFED1, 0xFED2, 0xFED3, 0xFED4}, // fa2 (32)
{0xFED5, 0xFED6, 0xFED7, 0xFED8}, // qaf (33)
{0xFED9, 0xFEDA, 0xFEDB, 0xFEDC}, // kaf (34)
{0xFEDD, 0xFEDE, 0xFEDF, 0xFEE0}, // lam (35)
{0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4}, // mim (36)
{0xFEE5, 0xFEE6, 0xFEE7, 0xFEE8}, // noon (37)
{0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC}, // ha2 (38)
{0xFEED, 0xFEEE, 0, 0}, // waw (39)
{0xFEFF, 0xFEF0, 0, 0}, // 2alif maksoura (40)
{0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4} // ya2 (41)
};
bool is_arabic_letter(uint32_t cp)
{
if( cp >= ARABIC_LETTER_START && cp <= ARABIC_LETTER_END )
return true;
return false;
}
bool is_linking_type(uint32_t cp)
{
if( cp >= ARABIC_LETTER_START && cp <= ARABIC_LETTER_END )
if( arabic_forms_b[cp - ARABIC_LETTER_START][INITIAL] || arabic_forms_b[cp - ARABIC_LETTER_START][MEDIAL] )
return true;
return false;
}
uint32_t get_presentation_form_b(uint32_t prev, uint32_t next, uint32_t cp)
{
if( !is_arabic_letter(cp) )
return cp; /* not an Arabic letter */
uint32_t index = ((is_arabic_letter(next) & is_linking_type(cp)) << 1) | is_linking_type(prev);
return arabic_forms_b[cp - ARABIC_LETTER_START][index];
}
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