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+/* Sord, a lightweight RDF model library.
+ * Copyright 2010-2011 David Robillard <d@drobilla.net>
+ *
+ * Sord is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Sord is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "serd/serd.h"
+
+#include "sord-config.h"
+#include "sord/sord.h"
+
+typedef struct {
+ SerdReader reader;
+ SerdEnv env;
+ SerdNode base_uri_node;
+ SerdURI base_uri;
+ Sord sord;
+} ReadState;
+
+static uint8_t*
+copy_string(const uint8_t* str, size_t* n_bytes)
+{
+ const size_t len = strlen((const char*)str);
+ uint8_t* const ret = malloc(len + 1);
+ memcpy(ret, str, len + 1);
+ *n_bytes = len + 1;
+ return ret;
+}
+
+static bool
+event_base(void* handle,
+ const SerdNode* uri_node)
+{
+ ReadState* const state = (ReadState*)handle;
+ SerdNode base_uri_node = *uri_node;
+ SerdURI base_uri;
+ if (!serd_uri_parse(uri_node->buf, &base_uri)) {
+ return false;
+ }
+
+ SerdURI abs_base_uri;
+ if (!serd_uri_resolve(&base_uri, &state->base_uri, &abs_base_uri)) {
+ fprintf(stderr, "error: failed to resolve new base URI\n");
+ return false;
+ }
+ base_uri_node = serd_node_new_uri(&abs_base_uri, &base_uri);
+
+ serd_node_free(&state->base_uri_node);
+ state->base_uri_node = base_uri_node;
+ state->base_uri = base_uri;
+ return true;
+}
+
+static bool
+event_prefix(void* handle,
+ const SerdNode* name,
+ const SerdNode* uri_node)
+{
+ ReadState* const state = (ReadState*)handle;
+ if (!serd_uri_string_has_scheme(uri_node->buf)) {
+ SerdURI uri;
+ if (!serd_uri_parse(uri_node->buf, &uri)) {
+ return false;
+ }
+ SerdURI abs_uri;
+ if (!serd_uri_resolve(&uri, &state->base_uri, &abs_uri)) {
+ return false;
+ }
+ SerdURI base_uri;
+ SerdNode base_uri_node = serd_node_new_uri(&abs_uri, &base_uri);
+ serd_env_add(state->env, name, &base_uri_node);
+ serd_node_free(&base_uri_node);
+ } else {
+ serd_env_add(state->env, name, uri_node);
+ }
+ return true;
+}
+
+static inline SordID
+sord_node_from_serd_node(ReadState* state, const SerdNode* sn)
+{
+ return sord_get_uri_counted(state->sord, true, (const char*)sn->buf, sn->n_chars);
+}
+
+static bool
+event_statement(void* handle,
+ const SerdNode* graph,
+ const SerdNode* subject,
+ const SerdNode* predicate,
+ const SerdNode* object,
+ const SerdNode* object_datatype,
+ const SerdNode* object_lang)
+{
+ ReadState* const state = (ReadState*)handle;
+
+ SordTuple tup;
+ tup[0] = sord_node_from_serd_node(state, subject);
+ tup[1] = sord_node_from_serd_node(state, predicate);
+ tup[2] = sord_node_from_serd_node(state, object);
+ tup[3] = (graph && graph->buf)
+ ? sord_node_from_serd_node(state, graph)
+ : NULL;
+
+ sord_add(state->sord, tup);
+
+ return true;
+}
+
+SORD_API
+bool
+sord_read_file(Sord sord, const uint8_t* input)
+{
+ const uint8_t* filename = NULL;
+ if (serd_uri_string_has_scheme(input)) {
+ // INPUT is an absolute URI, ensure it a file and chop scheme
+ if (strncmp((const char*)input, "file:", 5)) {
+ fprintf(stderr, "unsupported URI scheme `%s'\n", input);
+ return 1;
+ } else if (!strncmp((const char*)input, "file://", 7)) {
+ filename = input + 7;
+ } else {
+ filename = input + 5;
+ }
+ } else {
+ filename = input;
+ }
+
+ FILE* in_fd = fopen((const char*)input, "r");
+ if (!in_fd) {
+ fprintf(stderr, "failed to open file %s\n", input);
+ return 1;
+ }
+
+ size_t base_uri_n_bytes = 0;
+ uint8_t* base_uri_str = copy_string(input, &base_uri_n_bytes);
+ SerdURI base_uri;
+ if (!serd_uri_parse(base_uri_str, &base_uri)) {
+ fprintf(stderr, "invalid base URI `%s'\n", base_uri_str);
+ }
+
+ SerdEnv env = serd_env_new();
+
+ const SerdNode base_uri_node = { SERD_URI,
+ base_uri_n_bytes,
+ base_uri_n_bytes - 1, // FIXME: UTF-8
+ base_uri_str };
+
+ ReadState state = { NULL, env, base_uri_node, base_uri, sord };
+
+ state.reader = serd_reader_new(
+ SERD_TURTLE, &state,
+ event_base, event_prefix, event_statement, NULL);
+
+ const bool success = serd_reader_read_file(state.reader, in_fd, input);
+
+ serd_reader_free(state.reader);
+ serd_env_free(state.env);
+ serd_node_free(&state.base_uri_node);
+ fclose(in_fd);
+
+ return success;
+}