Add uprop_get_lc()

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/unicode/prop/uprop_get_lc.c b/lib/unicode/prop/uprop_get_lc.c
new file mode 100644
index 0000000..4bbdc12
--- /dev/null
+++ b/lib/unicode/prop/uprop_get_lc.c
@@ -0,0 +1,45 @@
+#include "macros.h"
+#include "unicode/prop.h"
+
+#define M(...) ((struct rview)_(__VA_ARGS__))
+#define _(...) \
+	{(const rune[]){__VA_ARGS__}, lengthof(((const rune[]){__VA_ARGS__}))}
+
+struct rview
+uprop_get_lc(rune ch, struct lcctx ctx)
+{
+	if (ch == U'Σ')
+		return ctx.eow ? M(U'ς') : M(U'σ');
+	if (ch == U'İ')
+		return ctx.az_or_tr ? M('i') : M('i', 0x307);
+
+	if (ctx.lt_acc_after) {
+		switch (ch) {
+		case 'I':
+			return M('i', 0x307);
+		case 'J':
+			return M('j', 0x307);
+		case U'Į':
+			return M(U'į', 0x307);
+		}
+	}
+
+	if (ctx.lt) {
+		switch (ch) {
+		case U'Ì':
+			return M('i', 0x307, 0x300);
+		case U'Í':
+			return M('i', 0x307, 0x301);
+		case U'Ĩ':
+			return M('i', 0x307, 0x303);
+		}
+	}
+
+	if (ch == 0x307 && ctx.az_tr_after_I)
+		return M();
+	if (ch == 'I' && ctx.az_tr_not_before_dot)
+		return M(U'ı');
+
+	ch = uprop_get_slc(ch);
+	return M(ch);
+}