diff options
Diffstat (limited to 'arabtype.c')
| -rw-r--r-- | arabtype.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arabtype.c b/arabtype.c new file mode 100644 index 0000000..d9ac78d --- /dev/null +++ b/arabtype.c @@ -0,0 +1,96 @@ +/* +** 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]; +} |