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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* raptor_serialize_ntriples.c - N-Triples and Nquads serializer
*
* Copyright (C) 2004-2010, David Beckett http://www.dajobe.org/
* Copyright (C) 2004-2005, University of Bristol, UK http://www.bristol.ac.uk/
*
* This package is Free Software and part of Redland http://librdf.org/
*
* It is licensed under the following three licenses as alternatives:
* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
* 2. GNU General Public License (GPL) V2 or any newer version
* 3. Apache License, V2.0 or any newer version
*
* You may not use this file except in compliance with at least one of
* the above three licenses.
*
* See LICENSE.html or LICENSE.txt at the top of this package for the
* complete terms and further detail along with the license texts for
* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
*
*/
#ifdef HAVE_CONFIG_H
#include <raptor_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
/* Raptor includes */
#include "raptor2.h"
#include "raptor_internal.h"
/*
* Raptor N-Triples serializer object
*/
typedef struct {
int is_nquads;
} raptor_ntriples_serializer_context;
/* create a new serializer */
static int
raptor_ntriples_serialize_init(raptor_serializer* serializer, const char *name)
{
raptor_ntriples_serializer_context* ntriples_serializer;
ntriples_serializer = (raptor_ntriples_serializer_context*)serializer->context;
ntriples_serializer->is_nquads = !strcmp(name, "nquads");
return 0;
}
/* destroy a serializer */
static void
raptor_ntriples_serialize_terminate(raptor_serializer* serializer)
{
}
/* add a namespace */
static int
raptor_ntriples_serialize_declare_namespace(raptor_serializer* serializer,
raptor_uri *uri,
const unsigned char *prefix)
{
/* NOP */
return 0;
}
#if 0
/* start a serialize */
static int
raptor_ntriples_serialize_start(raptor_serializer* serializer)
{
return 0;
}
#endif
/**
* raptor_string_ntriples_write:
* @string: UTF-8 string to write
* @len: length of UTF-8 string
* @delim: Terminating delimiter character for string (such as " or >)
* or \0 for no escaping.
* @iostr: #raptor_iostream to write to
*
* Write an UTF-8 string using N-Triples escapes to an iostream.
*
* Return value: non-0 on failure such as bad UTF-8 encoding.
**/
int
raptor_string_ntriples_write(const unsigned char *string,
size_t len,
const char delim,
raptor_iostream *iostr)
{
return raptor_string_escaped_write(string, len, delim,
RAPTOR_ESCAPED_WRITE_NTRIPLES_LITERAL,
iostr);
}
/**
* raptor_bnodeid_ntriples_write:
* @bnodeid: bnode ID to write
* @len: length of bnode ID
* @iostr: #raptor_iostream to write to
*
* Write a blank node ID in a form legal for N-Triples with _: prefix
*
* Return value: non-0 on failure
**/
int
raptor_bnodeid_ntriples_write(const unsigned char *bnodeid,
size_t len,
raptor_iostream *iostr)
{
unsigned int i;
raptor_iostream_counted_string_write("_:", 2, iostr);
for(i = 0; i < len; i++) {
unsigned char c = *bnodeid++;
if(!isalpha(c) && !isdigit(c)) {
/* Replace characters not in legal N-Triples bnode set */
c = 'z';
}
raptor_iostream_write_byte(c, iostr);
}
return 0;
}
/**
* raptor_term_ntriples_write:
* @term: term to write
* @iostr: raptor iostream
*
* Write a #raptor_term formatted in N-Triples format to a #raptor_iostream
*
* @Deprecated: Use raptor_term_escaped_write() that allows
* configuring format detail flags.
*
* Return value: non-0 on failure
**/
int
raptor_term_ntriples_write(const raptor_term *term, raptor_iostream* iostr)
{
return raptor_term_escaped_write(term,
RAPTOR_ESCAPED_WRITE_NTRIPLES_LITERAL,
iostr);
}
/**
* raptor_statement_ntriples_write:
* @statement: statement to write
* @iostr: raptor iostream
* @write_graph_term: flag to write graph term if present
*
* Write a #raptor_statement formatted in N-Triples or N-Quads format
* to a #raptor_iostream
*
* Return value: non-0 on failure
**/
int
raptor_statement_ntriples_write(const raptor_statement *statement,
raptor_iostream* iostr,
int write_graph_term)
{
unsigned int flags = RAPTOR_ESCAPED_WRITE_NTRIPLES_LITERAL;
RAPTOR_ASSERT_OBJECT_POINTER_RETURN_VALUE(statement, raptor_statement, 1);
if(raptor_term_escaped_write(statement->subject, flags, iostr))
return 1;
raptor_iostream_write_byte(' ', iostr);
if(raptor_term_escaped_write(statement->predicate, flags, iostr))
return 1;
raptor_iostream_write_byte(' ', iostr);
if(raptor_term_escaped_write(statement->object, flags, iostr))
return 1;
if(statement->graph && write_graph_term) {
raptor_iostream_write_byte(' ', iostr);
if(raptor_term_escaped_write(statement->graph, flags, iostr))
return 1;
}
raptor_iostream_counted_string_write(" .\n", 3, iostr);
return 0;
}
/* serialize a statement */
static int
raptor_ntriples_serialize_statement(raptor_serializer* serializer,
raptor_statement *statement)
{
raptor_ntriples_serializer_context* ntriples_serializer;
ntriples_serializer = (raptor_ntriples_serializer_context*)serializer->context;
raptor_statement_ntriples_write(statement,
serializer->iostream,
ntriples_serializer->is_nquads);
return 0;
}
#if 0
/* end a serialize */
static int
raptor_ntriples_serialize_end(raptor_serializer* serializer)
{
return 0;
}
#endif
/* finish the serializer factory */
static void
raptor_ntriples_serialize_finish_factory(raptor_serializer_factory* factory)
{
}
#ifdef RAPTOR_SERIALIZER_NTRIPLES
static const char* const ntriples_names[2] = { "ntriples", NULL};
static const char* const ntriples_uri_strings[3] = {
"http://www.w3.org/ns/formats/N-Triples",
"http://www.w3.org/TR/rdf-testcases/#ntriples",
NULL
};
#define NTRIPLES_TYPES_COUNT 2
static const raptor_type_q ntriples_types[NTRIPLES_TYPES_COUNT + 1] = {
{ "application/n-triples", 21, 10},
{ "text/plain", 10, 1},
{ NULL, 0, 0}
};
static int
raptor_ntriples_serializer_register_factory(raptor_serializer_factory *factory)
{
factory->desc.names = ntriples_names;
factory->desc.mime_types = ntriples_types;
factory->desc.label = "N-Triples";
factory->desc.uri_strings = ntriples_uri_strings;
factory->context_length = sizeof(raptor_ntriples_serializer_context);
factory->init = raptor_ntriples_serialize_init;
factory->terminate = raptor_ntriples_serialize_terminate;
factory->declare_namespace = raptor_ntriples_serialize_declare_namespace;
factory->serialize_start = NULL;
factory->serialize_statement = raptor_ntriples_serialize_statement;
factory->serialize_end = NULL;
factory->finish_factory = raptor_ntriples_serialize_finish_factory;
return 0;
}
#endif
#ifdef RAPTOR_SERIALIZER_NQUADS
static const char* const nquads_names[2] = { "nquads", NULL};
static const char* const nquads_uri_strings[2] = {
"http://sw.deri.org/2008/07/n-quads/#n-quads",
NULL
};
#define NQUADS_TYPES_COUNT 1
static const raptor_type_q nquads_types[NQUADS_TYPES_COUNT + 1] = {
{ "text/x-nquads", 13, 10},
{ NULL, 0, 0}
};
static int
raptor_nquads_serializer_register_factory(raptor_serializer_factory *factory)
{
factory->desc.names = nquads_names;
factory->desc.mime_types = nquads_types;
factory->desc.label = "N-Quads";
factory->desc.uri_strings = nquads_uri_strings;
factory->context_length = sizeof(raptor_ntriples_serializer_context);
factory->init = raptor_ntriples_serialize_init;
factory->terminate = raptor_ntriples_serialize_terminate;
factory->declare_namespace = raptor_ntriples_serialize_declare_namespace;
factory->serialize_start = NULL;
factory->serialize_statement = raptor_ntriples_serialize_statement;
factory->serialize_end = NULL;
factory->finish_factory = raptor_ntriples_serialize_finish_factory;
return 0;
}
#endif
#ifdef RAPTOR_SERIALIZER_NTRIPLES
int
raptor_init_serializer_ntriples(raptor_world* world)
{
return !raptor_serializer_register_factory(world,
&raptor_ntriples_serializer_register_factory);
}
#endif
#ifdef RAPTOR_SERIALIZER_NQUADS
int
raptor_init_serializer_nquads(raptor_world* world)
{
return !raptor_serializer_register_factory(world,
&raptor_nquads_serializer_register_factory);
}
#endif
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