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-rw-r--r--src/serdi.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/src/serdi.c b/src/serdi.c
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+++ b/src/serdi.c
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+/* Serd, an RDF serialisation library.
+ * Copyright 2011 David Robillard <d@drobilla.net>
+ *
+ * Serd 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.
+ *
+ * Serd 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 <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "serd/serd.h"
+
+typedef struct {
+ FILE* out_fd;
+ SerdNamespaces ns;
+ SerdString* base_uri_str;
+ SerdURI base_uri;
+} State;
+
+static bool
+event_base(void* handle,
+ const SerdString* uri_str)
+{
+ State* const state = (State*)handle;
+
+ SerdURI uri;
+ if (!serd_uri_parse(uri_str->buf, &uri)) {
+ return false;
+ }
+
+ SerdURI base_uri = {{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},false};
+ SerdString* base_uri_str;
+ if (!uri.scheme.len) {
+ // URI has no scheme (relative by definition), resolve
+ SerdURI abs_base_uri;
+ if (!serd_uri_resolve(&uri, &state->base_uri, &abs_base_uri)) {
+ fprintf(stderr, "error: failed to resolve new base URI\n");
+ assert(false);
+ return false;
+ }
+ base_uri_str = serd_uri_serialise(&abs_base_uri, &base_uri);
+ // FIXME: double parse
+ serd_uri_parse(base_uri_str->buf, &base_uri);
+ } else {
+ // Absolute URI, use literally as new base URI
+ base_uri_str = serd_string_copy(uri_str);
+ // FIXME: double parse
+ serd_uri_parse(base_uri_str->buf, &base_uri);
+ }
+
+ // Replace the old base URI
+ free(state->base_uri_str);
+ state->base_uri_str = base_uri_str;
+ state->base_uri = base_uri;
+
+ return true;
+}
+
+static bool
+event_prefix(void* handle,
+ const SerdString* name,
+ const SerdString* uri_string)
+{
+ State* const state = (State*)handle;
+ if (serd_uri_string_is_relative(uri_string->buf)) {
+ SerdURI uri;
+ if (!serd_uri_parse(uri_string->buf, &uri)) {
+ return false;
+ }
+ SerdURI abs_uri;
+ if (!serd_uri_resolve(&uri, &state->base_uri, &abs_uri)) {
+ return false;
+ }
+ SerdURI new_abs_uri;
+ SerdString* abs_uri_string = serd_uri_serialise(&abs_uri, &new_abs_uri);
+ serd_namespaces_add(state->ns, name, abs_uri_string);
+ } else {
+ serd_namespaces_add(state->ns, name, uri_string);
+ }
+ return true;
+}
+
+static inline bool
+write_node(State* state,
+ const SerdString* str,
+ SerdNodeType type,
+ const SerdString* datatype,
+ const SerdString* lang)
+{
+ SerdRange uri_prefix;
+ SerdRange uri_suffix;
+ switch (type) {
+ case BLANK:
+ fwrite("_:", 1, 2, state->out_fd);
+ fwrite(str->buf, 1, str->n_bytes - 1, state->out_fd);
+ break;
+ case QNAME:
+ if (!serd_namespaces_expand(state->ns, str, &uri_prefix, &uri_suffix)) {
+ fprintf(stderr, "error: undefined namespace prefix `%s'\n", str->buf);
+ return false;
+ }
+ fwrite("<", 1, 1, state->out_fd);
+ fwrite(uri_prefix.buf, 1, uri_prefix.len - 1, state->out_fd);
+ fwrite(uri_suffix.buf, 1, uri_suffix.len - 1, state->out_fd);
+ fwrite(">", 1, 1, state->out_fd);
+ break;
+ case URI:
+ if (serd_uri_string_is_relative(str->buf)) {
+ SerdURI uri;
+ if (serd_uri_parse(str->buf, &uri)) {
+ SerdURI abs_uri;
+ if (serd_uri_resolve(&uri, &state->base_uri, &abs_uri)) {
+ fwrite("<", 1, 1, state->out_fd);
+ serd_uri_write(&abs_uri, state->out_fd);
+ fwrite(">", 1, 1, state->out_fd);
+ return true;
+ }
+ }
+ } else {
+ fwrite("<", 1, 1, state->out_fd);
+ fwrite(str->buf, 1, str->n_bytes - 1, state->out_fd);
+ fwrite(">", 1, 1, state->out_fd);
+ return true;
+ }
+ return false;
+ case LITERAL:
+ fwrite("\"", 1, 1, state->out_fd);
+ for (size_t i = 0; i < str->n_bytes - 1; ++i) {
+ const char c = str->buf[i];
+ switch (c) {
+ case '\\': fwrite("\\\\", 1, 2, state->out_fd); break;
+ case '\n': fwrite("\\n", 1, 2, state->out_fd); break;
+ case '\r': fwrite("\\r", 1, 2, state->out_fd); break;
+ case '\t': fwrite("\\t", 1, 2, state->out_fd); break;
+ case '"': fwrite("\\\"", 1, 2, state->out_fd); break;
+ default:
+ fwrite(&c, 1, 1, state->out_fd);
+ }
+ }
+ fwrite("\"", 1, 1, state->out_fd);
+ if (lang) {
+ fwrite("@\"", 1, 2, state->out_fd);
+ fwrite(lang->buf, 1, lang->n_bytes - 1, state->out_fd);
+ fwrite("\"", 1, 1, state->out_fd);
+ } else if (datatype) {
+ fwrite("^^", 1, 2, state->out_fd);
+ write_node(state, datatype, URI, NULL, NULL);
+ }
+ break;
+ }
+ return true;
+}
+
+static bool
+event_statement(void* handle,
+ const SerdString* graph,
+ const SerdString* subject,
+ SerdNodeType subject_type,
+ const SerdString* predicate,
+ SerdNodeType predicate_type,
+ const SerdString* object,
+ SerdNodeType object_type,
+ const SerdString* object_datatype,
+ const SerdString* object_lang)
+{
+ State* const state = (State*)handle;
+ FILE* const fd = state->out_fd;
+ write_node(state, subject, subject_type, NULL, NULL);
+ fwrite(" ", 1, 1, fd);
+ write_node(state, predicate, predicate_type, NULL, NULL);
+ fwrite(" ", 1, 1, fd);
+ write_node(state, object, object_type, object_datatype, object_lang);
+ fwrite(" .\n", 1, 3, fd);
+ return true;
+}
+
+int
+main(int argc, char** argv)
+{
+ if (/*argc != 2 && */argc != 3) {
+ fprintf(stderr, "Bad parameters\n");
+ return 1;
+ }
+
+ const uint8_t* const in_filename = (uint8_t*)argv[1];
+ const uint8_t* base_uri_str = in_filename;
+
+ SerdURI base_uri;
+ if (argc > 2) {
+ base_uri_str = (const uint8_t*)argv[2];
+ if (!serd_uri_parse(base_uri_str, &base_uri)) {
+ fprintf(stderr, "invalid base uri: %s\n", base_uri_str);
+ return 1;
+ }
+
+ }
+
+ FILE* const in_fd = fopen((const char*)in_filename, "r");
+ FILE* out_fd = stdout;
+
+ if (!in_fd) {
+ fprintf(stderr, "failed to open file\n");
+ return 1;
+ }
+
+ //SerdURI null_uri = {{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}};
+ State state = { out_fd, serd_namespaces_new(), serd_string_new(base_uri_str), base_uri };
+
+ SerdReader reader = serd_reader_new(
+ SERD_TURTLE, &state, event_base, event_prefix, event_statement);
+
+ const bool success = serd_reader_read_file(reader, in_fd, in_filename);
+ serd_reader_free(reader);
+ fclose(in_fd);
+ serd_namespaces_free(state.ns);
+ free(state.base_uri_str);
+
+ if (success) {
+ return 0;
+ }
+
+ return 1;
+}
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