X-Git-Url: https://git.hcoop.net/hcoop/debian/courier-authlib.git/blobdiff_plain/781cfcb8fd50934c470e0dabf79d32ab333dec68..f77892e671e1261ec26e5133f86b8a52635f3dd2:/libs/unicode/unicode_graphemebreak.c

diff --git a/libs/unicode/unicode_graphemebreak.c b/libs/unicode/unicode_graphemebreak.c
new file mode 100644
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 */
+}