Factor out and expose prefixed name predicates

Towards using these in the writer to escape names more precisely.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/turtle.h b/src/turtle.h
new file mode 100644
index 00000000..c521713e
--- /dev/null
+++ b/src/turtle.h
@@ -0,0 +1,45 @@
+/*
+  Copyright 2011-2020 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SERD_TURTLE_H
+#define SERD_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_TURTLE_H