First Commit

libui-ng/unix/graphemes.c

@@ -0,0 +1,63 @@
+// 25 may 2016
+#include "uipriv_unix.h"
+#include "attrstr.h"
+
+int uiprivGraphemesTakesUTF16(void)
+{
+	return 0;
+}
+
+uiprivGraphemes *uiprivNewGraphemes(void *s, size_t len)
+{
+	uiprivGraphemes *g;
+	char *text = (char *) s;
+	size_t lenchars;
+	PangoLogAttr *logattrs;
+	size_t i;
+	size_t *op;
+
+	g = uiprivNew(uiprivGraphemes);
+
+	// TODO see if we can use the utf routines
+	lenchars = g_utf8_strlen(text, -1);
+	logattrs = (PangoLogAttr *) uiprivAlloc((lenchars + 1) * sizeof (PangoLogAttr), "PangoLogAttr[] (graphemes)");
+	pango_get_log_attrs(text, len,
+		-1, NULL,
+		logattrs, lenchars + 1);
+
+	// first figure out how many graphemes there are
+	g->len = 0;
+	for (i = 0; i < lenchars; i++)
+		if (logattrs[i].is_cursor_position != 0)
+			g->len++;
+
+	g->pointsToGraphemes = (size_t *) uiprivAlloc((len + 1) * sizeof (size_t), "size_t[] (graphemes)");
+	g->graphemesToPoints = (size_t *) uiprivAlloc((g->len + 1) * sizeof (size_t), "size_t[] (graphemes)");
+
+	// compute the graphemesToPoints array
+	// TODO merge with the next for loop somehow?
+	op = g->graphemesToPoints;
+	for (i = 0; i < lenchars; i++)
+		if (logattrs[i].is_cursor_position != 0)
+			// TODO optimize this
+			*op++ = g_utf8_offset_to_pointer(text, i) - text;
+	// and do the last one
+	*op++ = len;
+
+	// and finally build the pointsToGraphemes array
+	op = g->pointsToGraphemes;
+	for (i = 0; i < g->len; i++) {
+		size_t j;
+		size_t first, last;
+
+		first = g->graphemesToPoints[i];
+		last = g->graphemesToPoints[i + 1];
+		for (j = first; j < last; j++)
+			*op++ = i;
+	}
+	// and do the last one
+	*op++ = i;
+
+	uiprivFree(logattrs);
+	return g;
+}