Initial import.

git-svn-id: http://svn.drobilla.net/serd/trunk@2 490d8e77-9747-427b-9fa3-0b8f29cee8a0

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;
+}