1 files changed, 32 insertions, 0 deletions
diff --git a/src/turtle.h b/src/turtle.h
new file mode 100644
index 00000000..6e7e3a8d
--- /dev/null
+++ b/src/turtle.h
@@ -0,0 +1,32 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef SERD_SRC_TURTLE_H
+#define SERD_SRC_TURTLE_H
+
+#include "ntriples.h"
+#include "string_utils.h"
+
+#include <stdbool.h>
+#include <string.h>
+
+static inline bool
+is_PN_CHARS_U(const int c)
+{
+  return c == '_' || is_PN_CHARS_BASE(c);
+}
+
+static inline bool
+is_PN_CHARS(const int c)
+{
+  return (is_PN_CHARS_U(c) || c == '-' || in_range(c, '0', '9') || c == 0xB7 ||
+          (c >= 0x0300 && c <= 0x036F) || (c >= 0x203F && c <= 0x2040));
+}
+
+static inline bool
+is_PN_LOCAL_ESC(const int c)
+{
+  return strchr("!#$%&\'()*+,-./;=?@_~", c) != NULL;
+}
+
+#endif // SERD_SRC_TURTLE_H