Add flipping and turning for yijing n-grams, and add invisible

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 32 insertions, 0 deletions

diff --git a/libcharconv_invisible.c b/libcharconv_invisible.c
new file mode 100644
index 0000000..a3bda95
--- /dev/null
+++ b/libcharconv_invisible.c
@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#include "lib-common.h"
+
+
+enum libcharconv_result
+libcharconv_invisible(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
+{
+	uint_least32_t c;
+	*n = 0;
+	for (; slen--; s++) {
+		switch (*s) {
+		case '(': c = UINT32_C(0x2061); goto conv;
+		case '*': c = UINT32_C(0x2062); goto conv;
+		case '|': c = UINT32_C(0x2063); goto conv;
+		case '+': c = UINT32_C(0x2064); goto conv;
+		default:
+			*n += 1u;
+			break;
+		}
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += 1u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}