Merge branch 'debian'

[hcoop/debian/courier-authlib.git] / libs / unicode / unicode_graphemebreak.c

diff --git a/libs/unicode/unicode_graphemebreak.c b/libs/unicode/unicode_graphemebreak.c
new file mode 100644 (file)
index 0000000..5939dc8
--- /dev/null
+++ b/libs/unicode/unicode_graphemebreak.c
@@ -0,0 +1,95 @@
+/*
+** Copyright 2011 Double Precision, Inc.
+** See COPYING for distribution information.
+**
+*/
+
+#include       "unicode_config.h"
+#include       "unicode.h"
+#include       <unistd.h>
+#include       <stdint.h>
+#include       <stdlib.h>
+
+#define UNICODE_GRAPHEMEBREAK_ANY              0x00
+#define UNICODE_GRAPHEMEBREAK_CR               0x01
+#define UNICODE_GRAPHEMEBREAK_LF               0x02
+#define UNICODE_GRAPHEMEBREAK_Control          0x03
+#define UNICODE_GRAPHEMEBREAK_Extend           0x04
+#define UNICODE_GRAPHEMEBREAK_Prepend          0x05
+#define UNICODE_GRAPHEMEBREAK_SpacingMark      0x06
+#define UNICODE_GRAPHEMEBREAK_L                        0x07
+#define UNICODE_GRAPHEMEBREAK_V                        0x08
+#define UNICODE_GRAPHEMEBREAK_T                        0x09
+#define UNICODE_GRAPHEMEBREAK_LV               0x0A
+#define UNICODE_GRAPHEMEBREAK_LVT              0x0B
+
+#include "graphemebreaktab.h"
+
+int unicode_grapheme_break(unicode_char a, unicode_char b)
+{
+       uint8_t ac=unicode_tab_lookup(a, unicode_indextab,
+                        sizeof(unicode_indextab)/sizeof(unicode_indextab[0]),
+                        unicode_rangetab,
+                        unicode_classtab,
+                        UNICODE_GRAPHEMEBREAK_ANY),
+               bc=unicode_tab_lookup(b, unicode_indextab,
+                        sizeof(unicode_indextab)/sizeof(unicode_indextab[0]),
+                        unicode_rangetab,
+                        unicode_classtab,
+                        UNICODE_GRAPHEMEBREAK_ANY);
+
+       /* GB1 and GB2 are implied */
+
+       if (ac == UNICODE_GRAPHEMEBREAK_CR && bc == UNICODE_GRAPHEMEBREAK_LF)
+               return 0; /* GB3 */
+
+
+       switch (ac) {
+       case UNICODE_GRAPHEMEBREAK_CR:
+       case UNICODE_GRAPHEMEBREAK_LF:
+       case UNICODE_GRAPHEMEBREAK_Control:
+               return 1; /* GB4 */
+       default:
+               break;
+       }
+
+       switch (bc) {
+       case UNICODE_GRAPHEMEBREAK_CR:
+       case UNICODE_GRAPHEMEBREAK_LF:
+       case UNICODE_GRAPHEMEBREAK_Control:
+               return 1; /* GB5 */
+       default:
+               break;
+       }
+
+       if (ac == UNICODE_GRAPHEMEBREAK_L)
+               switch (bc) {
+               case UNICODE_GRAPHEMEBREAK_L:
+               case UNICODE_GRAPHEMEBREAK_V:
+               case UNICODE_GRAPHEMEBREAK_LV:
+               case UNICODE_GRAPHEMEBREAK_LVT:
+                       return 0; /* GB6 */
+               }
+
+       if ((ac == UNICODE_GRAPHEMEBREAK_LV ||
+            ac == UNICODE_GRAPHEMEBREAK_V) &&
+           (bc == UNICODE_GRAPHEMEBREAK_V ||
+            bc == UNICODE_GRAPHEMEBREAK_T))
+               return 0; /* GB7 */
+
+       if ((ac == UNICODE_GRAPHEMEBREAK_LVT ||
+            ac == UNICODE_GRAPHEMEBREAK_T) &&
+           bc == UNICODE_GRAPHEMEBREAK_T)
+               return 0; /* GB8 */
+
+       if (bc == UNICODE_GRAPHEMEBREAK_Extend)
+               return 0; /* GB9 */
+
+       if (bc == UNICODE_GRAPHEMEBREAK_SpacingMark)
+               return 0; /* GB9a */
+
+       if (ac == UNICODE_GRAPHEMEBREAK_Prepend)
+               return 0; /* GB9b */
+
+       return 1; /* GB10 */
+}