WIP: Add serd_node_from_syntax() and serd_node_to_syntax()

1 files changed, 97 insertions, 0 deletions

diff --git a/src/node_syntax.c b/src/node_syntax.c
new file mode 100644
index 00000000..10483188
--- /dev/null
+++ b/src/node_syntax.c
@@ -0,0 +1,97 @@
+/*
+  Copyright 2011-2020 David Robillard <http://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.
+*/
+
+#include "writer.h"
+
+#include "serd/serd.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static SerdStatus
+on_node_string_event(void* handle, const SerdEvent* event)
+{
+	if (event->type == SERD_STATEMENT) {
+		*(SerdNode**)handle = serd_node_copy(
+		    serd_statement_object(event->statement.statement));
+	}
+
+	return SERD_SUCCESS;
+}
+
+SerdNode*
+serd_node_from_syntax(const char* str, const SerdSyntax syntax)
+{
+	static const char* const prelude =
+	    "_:s <http://www.w3.org/2000/01/rdf-schema#object>";
+
+	const size_t str_len = strlen(str);
+	const size_t doc_len = strlen(prelude) + str_len + 3;
+	char* const  doc     = (char*)calloc(doc_len + 1, 1);
+
+	snprintf(doc, doc_len + 1, "%s %s .", prelude, str);
+
+	SerdNode*   object = NULL;
+	SerdWorld*  world  = serd_world_new();
+	SerdSink*   sink   = serd_sink_new(&object, NULL);
+
+	SerdByteSource* byte_source = serd_byte_source_new_string(doc, NULL);
+
+	SerdReader* reader = serd_reader_new(
+	    world, syntax, SERD_READ_EXACT_BLANKS, sink, 1024 + doc_len);
+
+	serd_world_set_log_func(world, serd_quiet_error_func, NULL);
+	serd_sink_set_event_func(sink, on_node_string_event);
+	serd_reader_start(reader, byte_source);
+	serd_reader_read_document(reader);
+	serd_reader_finish(reader);
+	serd_byte_source_free(byte_source);
+	serd_reader_free(reader);
+	serd_sink_free(sink);
+	serd_world_free(world);
+	free(doc);
+
+	return object;
+}
+
+char*
+serd_node_to_syntax(const SerdNode* node, const SerdSyntax syntax)
+{
+	SerdWorld*    world  = serd_world_new();
+	SerdBuffer    buffer = {NULL, 0};
+	SerdByteSink* bsink  = serd_byte_sink_new_buffer(&buffer);
+	SerdWriter*   writer = serd_writer_new(world, syntax, 0, NULL, bsink);
+
+	serd_world_set_log_func(world, serd_quiet_error_func, NULL);
+
+	SerdStatus st = serd_writer_write_node(writer, node);
+	if (!st) {
+		st = serd_writer_finish(writer);
+	}
+
+	serd_buffer_sink_finish(&buffer);
+	serd_writer_free(writer);
+	serd_byte_sink_free(bsink);
+	serd_world_free(world);
+
+	if (st) {
+		serd_free(buffer.buf);
+		return NULL;
+	}
+
+	return (char*)buffer.buf;
+}