--- /dev/null
+/* Authors:
+ * Tom Hacohen (tom@stsob.com)
+ */
+
+#include "../evas_intl_utils.h"
+
+#ifdef ARABIC_SUPPORT
+/* arabic contextualizing */
+
+/* arabic input forms */
+#define ARABIC_ALEPH_MADDA 0x0622
+#define ARABIC_ALEPH 0x0627
+#define ARABIC_BET 0x0628
+#define ARABIC_TA_MARBUTA 0x0629
+#define ARABIC_TAW 0x062A
+#define ARABIC_TA 0x062B
+#define ARABIC_GIMEL 0x062C
+#define ARABIC_HETH 0x062D
+#define ARABIC_HA 0x062E
+#define ARABIC_DALET 0x062F
+#define ARABIC_DAL 0x0630
+#define ARABIC_RESH 0x0631
+#define ARABIC_ZAYIN 0x0632
+#define ARABIC_SHIN 0x0633
+#define ARABIC_SH 0x0634
+#define ARABIC_TSADE 0x0635
+#define ARABIC_DAD 0x0636
+#define ARABIC_TETH 0x0637
+#define ARABIC_ZA 0x0638
+#define ARABIC_AYIN 0x0639
+#define ARABIC_GHAIN 0x063A
+#define ARABIC_PE 0x0641
+#define ARABIC_QOPH 0x0642
+#define ARABIC_KAPH 0x0643
+#define ARABIC_LAMED 0x0644
+#define ARABIC_MEM 0x0645
+#define ARABIC_NUN 0x0646
+#define ARABIC_HE 0x0647
+#define ARABIC_WAW 0x0648
+#define ARABIC_ALEPH_MAQSURA 0x0649
+#define ARABIC_YODH 0x064A
+/* arabic contextual forms */
+#define ARABIC_ISOLATED_ALEPH_MADDA 0xFE81
+#define ARABIC_ISOLATED_ALEPH 0xFE8D
+#define ARABIC_ISOLATED_TA_MARBUTA 0xFE93
+#define ARABIC_ISOLATED_BET 0xFE8F
+#define ARABIC_ISOLATED_TAW 0xFE95
+#define ARABIC_ISOLATED_TA 0xFE99
+#define ARABIC_ISOLATED_GIMEL 0xFE9D
+#define ARABIC_ISOLATED_HETH 0xFEA1
+#define ARABIC_ISOLATED_HA 0xFEA5
+#define ARABIC_ISOLATED_DALET 0xFEA9
+#define ARABIC_ISOLATED_DAL 0xFEAB
+#define ARABIC_ISOLATED_RESH 0xFEAD
+#define ARABIC_ISOLATED_ZAYIN 0xFEAF
+#define ARABIC_ISOLATED_SHIN 0xFEB1
+#define ARABIC_ISOLATED_SH 0xFEB5
+#define ARABIC_ISOLATED_TSADE 0xFEB9
+#define ARABIC_ISOLATED_DAD 0xFEBD
+#define ARABIC_ISOLATED_TETH 0xFEC1
+#define ARABIC_ISOLATED_ZA 0xFEC5
+#define ARABIC_ISOLATED_AYIN 0xFEC9
+#define ARABIC_ISOLATED_GHAIN 0xFECD
+#define ARABIC_ISOLATED_PE 0xFED1
+#define ARABIC_ISOLATED_QOPH 0xFED5
+#define ARABIC_ISOLATED_KAPH 0xFED9
+#define ARABIC_ISOLATED_LAMED 0xFEDD
+#define ARABIC_ISOLATED_MEM 0xFEE1
+#define ARABIC_ISOLATED_NUN 0xFEE5
+#define ARABIC_ISOLATED_HE 0xFEE9
+#define ARABIC_ISOLATED_WAW 0xFEED
+#define ARABIC_ISOLATED_ALEPH_MAQSURA 0xFEEF
+#define ARABIC_ISOLATED_YODH 0xFEF1
+
+#define ARABIC_IS_SPECIAL_LETTER(c) ((c) == ARABIC_ISOLATED_ALEPH || \
+ (c) == ARABIC_ISOLATED_DALET || \
+ (c) == ARABIC_ISOLATED_DAL || \
+ (c) == ARABIC_ISOLATED_RESH || \
+ (c) == ARABIC_ISOLATED_ZAYIN || \
+ (c) == ARABIC_ISOLATED_WAW || \
+ (c) == ARABIC_ISOLATED_TA_MARBUTA)
+/* from the first to last (including all forms, and special cases
+ * like aleph maqsura in some forms*/
+#define ARABIC_IS_CONTEXT(c) (((c) >= ARABIC_ISOLATED_ALEPH && (c) <= ARABIC_ISOLATED_YODH + 3) || \
+ ((c) >= ARABIC_ISOLATED_ALEPH_MADDA && (c) <= ARABIC_ISOLATED_ALEPH_MADDA + 3) || \
+ (c) == 0xFBE8 || \
+ (c) == 0xFBE9)
+#define ARABIC_IS_LETTER(c) ARABIC_IS_CONTEXT(c)
+/* used for arabic context logic */
+/* each value is the offset from the regular char in unicode */
+enum _ArabicContext {
+ ARABIC_CONTEXT_ISOLATED = 0,
+ ARABIC_CONTEXT_FINAL = 1,
+ ARABIC_CONTEXT_INITIAL = 2,
+ ARABIC_CONTEXT_MEDIAL = 3
+};
+typedef enum _ArabicContext ArabicContext;
+
+static FriBidiChar
+_evas_intl_arabic_isolated_to_context(FriBidiChar chr, ArabicContext context);
+
+static int
+_evas_intl_arabic_text_to_isolated(FriBidiChar *text);
+
+static FriBidiChar
+_evas_intl_arabic_general_to_isolated(FriBidiChar chr);
+
+/* FIXME: there are issues with text that's already in context
+ * vowels support is needed (skip them when analysing context)*/
+int
+evas_intl_arabic_to_context(FriBidiChar *text)
+{
+ int i;
+ int len;
+ int start_of_context = 1; /* assume the first is special/non arabic */
+ int last_is_first = 0;
+ int last_letter = 0;
+
+ /* check for empty string */
+ if (!*text)
+ return;
+
+ len = _evas_intl_arabic_text_to_isolated(text);
+ /*FIXME: make it skip vowels */
+ for (i = 0 ; i < len ; i++) {
+
+ if (! ARABIC_IS_LETTER(text[i])) {
+ /* mark so it won't be touched,
+ * though start formating */
+ if (last_letter && !start_of_context) {
+ ArabicContext tmp = (last_is_first) ?
+ ARABIC_CONTEXT_ISOLATED
+ :
+ ARABIC_CONTEXT_FINAL;
+ text[i-1] = _evas_intl_arabic_isolated_to_context(
+ last_letter,
+ tmp);
+
+ }
+ last_is_first = 0;
+ start_of_context = 1;
+ last_letter = 0;
+ continue;
+ }
+ /* adjust the last letter */
+ last_letter = text[i];
+ if (ARABIC_IS_SPECIAL_LETTER(text[i])) {
+ if (!start_of_context)
+ text[i] = _evas_intl_arabic_isolated_to_context(text[i], ARABIC_CONTEXT_FINAL);
+ /* else: leave isolated */
+
+ start_of_context = 1;
+ last_is_first = 0;
+ continue;
+ }
+
+ if (start_of_context) {
+ text[i] = _evas_intl_arabic_isolated_to_context(text[i], ARABIC_CONTEXT_INITIAL);
+ last_is_first = 1;
+ }
+ else {
+ text[i] = _evas_intl_arabic_isolated_to_context(text[i], ARABIC_CONTEXT_MEDIAL);
+ last_is_first = 0;
+ }
+ /* spceial chars don't get here. */
+ start_of_context = 0;
+
+ }
+ /* if it's arabic and not isolated, the last is always final */
+ i--;
+ if (last_letter && !start_of_context) {
+ ArabicContext tmp = (last_is_first) ? ARABIC_CONTEXT_ISOLATED : ARABIC_CONTEXT_FINAL;
+ /* because it's medial atm, and should be isolated */
+ text[i] = _evas_intl_arabic_isolated_to_context(
+ last_letter,
+ tmp);
+ }
+
+ return len;
+}
+
+/* I wish I could think about a simpler way to do it.
+ * Just match every word with it's isolated form */
+static FriBidiChar
+_evas_intl_arabic_general_to_isolated(FriBidiChar chr)
+{
+ switch (chr) {
+ case ARABIC_ALEPH_MADDA:
+ return ARABIC_ISOLATED_ALEPH_MADDA;
+
+ case ARABIC_ALEPH:
+ return ARABIC_ISOLATED_ALEPH;
+
+ case ARABIC_TA_MARBUTA:
+ return ARABIC_ISOLATED_TA_MARBUTA;
+ case ARABIC_BET:
+ return ARABIC_ISOLATED_BET;
+
+ case ARABIC_TAW:
+ return ARABIC_ISOLATED_TAW;
+
+ case ARABIC_TA:
+ return ARABIC_ISOLATED_TA;
+
+ case ARABIC_GIMEL:
+ return ARABIC_ISOLATED_GIMEL;
+
+ case ARABIC_HETH:
+ return ARABIC_ISOLATED_HETH;
+
+ case ARABIC_HA:
+ return ARABIC_ISOLATED_HA;
+
+ case ARABIC_DALET:
+ return ARABIC_ISOLATED_DALET;
+
+ case ARABIC_DAL:
+ return ARABIC_ISOLATED_DAL;
+
+ case ARABIC_RESH:
+ return ARABIC_ISOLATED_RESH;
+
+ case ARABIC_ZAYIN:
+ return ARABIC_ISOLATED_ZAYIN;
+
+ case ARABIC_SHIN:
+ return ARABIC_ISOLATED_SHIN;
+
+ case ARABIC_SH:
+ return ARABIC_ISOLATED_SH;
+
+ case ARABIC_TSADE:
+ return ARABIC_ISOLATED_TSADE;
+
+ case ARABIC_DAD:
+ return ARABIC_ISOLATED_DAD;
+
+ case ARABIC_TETH:
+ return ARABIC_ISOLATED_TETH;
+
+ case ARABIC_ZA:
+ return ARABIC_ISOLATED_ZA;
+
+ case ARABIC_AYIN:
+ return ARABIC_ISOLATED_AYIN;
+
+ case ARABIC_GHAIN:
+ return ARABIC_ISOLATED_GHAIN;
+
+ case ARABIC_PE:
+ return ARABIC_ISOLATED_PE;
+
+ case ARABIC_QOPH:
+ return ARABIC_ISOLATED_QOPH;
+
+ case ARABIC_KAPH:
+ return ARABIC_ISOLATED_KAPH;
+
+ case ARABIC_LAMED:
+ return ARABIC_ISOLATED_LAMED;
+
+ case ARABIC_MEM:
+ return ARABIC_ISOLATED_MEM;
+
+ case ARABIC_NUN:
+ return ARABIC_ISOLATED_NUN;
+
+ case ARABIC_HE:
+ return ARABIC_ISOLATED_HE;
+
+ case ARABIC_WAW:
+ return ARABIC_ISOLATED_WAW;
+
+ case ARABIC_ALEPH_MAQSURA:
+ return ARABIC_ISOLATED_ALEPH_MAQSURA;
+
+ case ARABIC_YODH:
+ return ARABIC_ISOLATED_YODH;
+ default:
+ return chr;
+ }
+}
+
+static FriBidiChar
+_evas_intl_arabic_isolated_to_context(FriBidiChar chr, ArabicContext context)
+{
+ if (ARABIC_IS_SPECIAL_LETTER(chr)) {
+ if (context == ARABIC_CONTEXT_INITIAL)
+ return chr;
+ else
+ return chr + ARABIC_CONTEXT_FINAL;
+ }
+ /* HACK AROUND ALIF MAQSURA */
+ else if (chr == ARABIC_ISOLATED_ALEPH_MAQSURA && context > 1) {
+ chr = 0xFBE8; /* the initial form */
+ context -= 2;
+ }
+ return chr + context;
+}
+
+static int
+_evas_intl_arabic_text_to_isolated(FriBidiChar *text)
+{
+ int i=0;
+ while (*text) {
+ /* if it's not arabic/it's already in context
+ * it's just returned the same */
+ *text = _evas_intl_arabic_general_to_isolated(*text);
+ text++;
+ i++;
+ }
+ return i;
+}
+#endif
\ No newline at end of file
projects / profile / ivi / evas.git / commitdiff