forgot this

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@17355 a592a061-630c-0410-9148-cb99ea01b6c8

src/support/textutils.C

@@ -0,0 +1,75 @@
+// -*- C++ -*-
+/**
+ * \file textutils.C
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
+ *
+ * \author Georg Baum
+ *
+ * Full author contact details are available in file CREDITS.
+ */
+
+// FIXME: I can think of a better name for this file ...
+
+#include "support/textutils.h"
+#include "support/qstring_helpers.h"
+
+namespace lyx {
+
+namespace {
+	/// Maximum valid UCS4 code point
+	char_type const ucs4_max = 0x10ffff;
+}
+
+
+bool isLetterChar(char_type c)
+{
+	if (!is_utf16(c)) {
+		if (c > ucs4_max)
+			// outside the UCS4 range
+			return false;
+		// assume that all non-utf16 characters are letters
+		return true;
+	}
+	return ucs4_to_qchar(c).isLetter();
+}
+
+
+bool isPrintable(char_type c)
+{
+	if (!is_utf16(c)) {
+		if (c > ucs4_max)
+			// outside the UCS4 range
+			return false;
+		// assume that all non-utf16 characters are printable
+		return true;
+	}
+	return ucs4_to_qchar(c).isPrint();
+}
+
+
+bool isPrintableNonspace(char_type c)
+{
+	if (!is_utf16(c)) {
+		if (c > ucs4_max)
+			// outside the UCS4 range
+			return false;
+		// assume that all non-utf16 characters are printable and
+		// no space
+		return true;
+	}
+	QChar const qc = ucs4_to_qchar(c);
+	return qc.isPrint() && !qc.isSpace();
+}
+
+
+bool isDigit(char_type c)
+{
+	if (!is_utf16(c))
+		// assume that no non-utf16 character is a digit
+		// c outside the UCS4 range is catched as well
+		return false;
+	return ucs4_to_qchar(c).isDigit();
+}
+
+} // namespace lyx