From 8a13a270d9150e0cd14a049c76c601d09ee539bf Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 21 Jun 2020 18:19:48 +0200
Subject: WIP: Add serd_node_from_syntax() and serd_node_to_syntax()

---
 src/node_syntax.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/node_syntax.c

(limited to 'src/node_syntax.c')

diff --git a/src/node_syntax.c b/src/node_syntax.c
new file mode 100644
index 00000000..88d360dd
--- /dev/null
+++ b/src/node_syntax.c
@@ -0,0 +1,96 @@
+/*
+  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.
+*/
+
+#include "writer.h"
+
+#include "serd/serd.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static SerdStatus
+quiet_error_func(void* const handle, const SerdError* const e)
+{
+  (void)handle;
+  (void)e;
+  return SERD_SUCCESS;
+}
+
+static SerdStatus
+on_node_string_event(void* const handle, const SerdEvent* const 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* const 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 + 4;
+  char* const  doc     = (char*)calloc(doc_len + 1, 1);
+
+  snprintf(doc, doc_len + 1, "%s %s .", prelude, str);
+
+  SerdNode*        object = NULL;
+  SerdWorld* const world  = serd_world_new();
+  SerdSink* const  sink   = serd_sink_new(&object, on_node_string_event, NULL);
+
+  SerdByteSource* const source = serd_byte_source_new_string(doc, NULL);
+  SerdReader* const     reader = serd_reader_new(
+    world, syntax, SERD_READ_EXACT_BLANKS, sink, 1024 + doc_len);
+
+  serd_world_set_error_func(world, quiet_error_func, NULL);
+  serd_reader_start(reader, source);
+  serd_reader_read_document(reader);
+  serd_reader_finish(reader);
+  serd_byte_source_free(source);
+  serd_reader_free(reader);
+  serd_sink_free(sink);
+  serd_world_free(world);
+  free(doc);
+
+  return object;
+}
+
+char*
+serd_node_to_syntax(const SerdNode* const node, const SerdSyntax syntax)
+{
+  SerdWorld* const    world  = serd_world_new();
+  SerdEnv* const      env    = serd_env_new(SERD_EMPTY_STRING());
+  SerdBuffer          buffer = {NULL, 0};
+  SerdByteSink* const out    = serd_byte_sink_new_buffer(&buffer);
+  SerdWriter* const   writer = serd_writer_new(world, syntax, 0, env, out);
+
+  serd_world_set_error_func(world, quiet_error_func, NULL);
+
+  SerdStatus st     = SERD_SUCCESS;
+  char*      result = NULL;
+  if (!(st = serd_writer_write_node(writer, node)) &&
+      !(st = serd_writer_finish(writer))) {
+    result = serd_buffer_sink_finish(&buffer);
+  }
+
+  return result;
+}
-- 
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