add tashkil support

diff --git a/arabtype.c b/arabtype.c
index 76355ad9011dee18b51f0975826779448b5e31e8..8e237db0fed96394ed00ec95e6af1f06aaebb115 100644 (file)
--- a/arabtype.c
+++ b/arabtype.c
@@ -23,13 +23,16 @@
 #include "utf8.h"
 #include "arabtype.h"
 
-#define ARABIC_LETTER_START            0x621
-#define ARABIC_LETTER_END              0x64A
+#define ARABIC_LETTER_START     0x621
+#define ARABIC_LETTER_END       0x64A
 
-#define ISOLATED       0
-#define ENDING         1
-#define INITIAL                2
-#define MEDIAL         3
+#define TASHKIL_LETTER_START    0x64B
+#define TASHKIL_LETTER_END      0x652
+
+#define ISOLATED    0
+#define ENDING      1
+#define INITIAL     2
+#define MEDIAL      3
 
 #define UNICODE_LAM    0x644
 
@@ -91,6 +94,7 @@ static all_form_t arabic_forms_b[]    = {
 
 
 static inline bool is_arabic_letter(uint32_t cp)               { return ( cp >= ARABIC_LETTER_START && cp <=  ARABIC_LETTER_END ); }
+static inline bool is_tashkil_letter(uint32_t cp)              { return ( cp >= TASHKIL_LETTER_START && cp <=  TASHKIL_LETTER_END ); }
 static inline bool is_lam_alef(uint32_t cp, uint32_t next)     { return cp == UNICODE_LAM &&
                                                                         is_arabic_letter(next) &&
                                                                         arabic_forms_b[next - ARABIC_LETTER_START][1][INITIAL] != 0; }
@@ -159,14 +163,24 @@ get_presentation_form_b(size_t in_len, unsigned char* in_str, size_t out_len, ui
        size_t          s       = 0;
 
        for( o = 0; o < cp_count; ++o) {
-               uint32_t        cp      = out_cp[o];
-               uint32_t        next    = o < cp_count - 1 ? out_cp[o + 1] : 0;
-               uint32_t        tcp     = get_presentation_form_b_of_char(prev, next, cp);
-               if( tcp != (uint32_t)-1 ) {
-                       out_cp[s]       = tcp;
+               uint32_t cp = out_cp[o];
+
+               if (!is_tashkil_letter(cp)) {
+                       uint32_t next = o < cp_count - 1 ? out_cp[o + 1] : 0;
+
+                       if (is_tashkil_letter(next))
+                               next = (o + 1) < cp_count - 1 ? out_cp[o + 2] : 0;
+
+                       uint32_t tcp = get_presentation_form_b_of_char(prev, next, cp);
+                       if( tcp != (uint32_t)-1 ) {
+                               out_cp[s]       = tcp;
+                               ++s;
+                       }
+                       prev    = cp;
+               } else {
+                       out_cp[s]       = cp;
                        ++s;
                }
-               prev    = cp;
        }
 
        return o;