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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* raptor_librdfa.c - Raptor RDFA Parser via librdfa implementation
*
* Copyright (C) 2008, David Beckett http://www.dajobe.org/
*
* 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"
#include "rdfa.h"
#include "rdfa_utils.h"
#define RAPTOR_DEFAULT_RDFA_VERSION 0
/*
* RDFA parser object
*/
struct raptor_librdfa_parser_context_s {
/* librdfa object */
rdfacontext* context;
/* static statement for use in passing to user code */
raptor_statement statement;
/* 10 for 1.0 11 for 1.1 or otherwise is default (== 1.1) */
int rdfa_version;
};
typedef struct raptor_librdfa_parser_context_s raptor_librdfa_parser_context;
static int
raptor_librdfa_parse_init(raptor_parser* rdf_parser, const char *name)
{
raptor_librdfa_parser_context *librdfa_parser;
int rdfa_version = RAPTOR_DEFAULT_RDFA_VERSION;
librdfa_parser = (raptor_librdfa_parser_context*)rdf_parser->context;
raptor_statement_init(&rdf_parser->statement, rdf_parser->world);
if(!strcmp(name, "rdfa11"))
rdfa_version = 11;
else if(!strcmp(name, "rdfa10"))
rdfa_version = 10;
librdfa_parser->rdfa_version = rdfa_version;
return 0;
}
static void
raptor_librdfa_parse_terminate(raptor_parser* rdf_parser)
{
raptor_librdfa_parser_context *librdfa_parser;
librdfa_parser = (raptor_librdfa_parser_context*)rdf_parser->context;
if(librdfa_parser->context) {
rdfa_parse_end(librdfa_parser->context);
rdfa_free_context(librdfa_parser->context);
librdfa_parser->context = NULL;
}
}
static void
raptor_librdfa_generate_statement(rdftriple* triple, void* callback_data)
{
raptor_parser* parser = (raptor_parser*)callback_data;
raptor_statement *s = &parser->statement;
raptor_term *subject_term = NULL;
raptor_term *predicate_term = NULL;
raptor_uri *predicate_uri = NULL;
raptor_term *object_term = NULL;
if(!parser->emitted_default_graph) {
raptor_parser_start_graph(parser, NULL, 0);
parser->emitted_default_graph++;
}
if(!parser->statement_handler)
goto cleanup;
if(!triple->subject || !triple->predicate || !triple->object) {
#ifdef RAPTOR_DEBUG
RAPTOR_FATAL1("Triple has NULL parts\n");
#endif
rdfa_free_triple(triple);
return;
}
if(triple->predicate[0] == '_') {
raptor_parser_warning(parser,
"Ignoring RDFa triple with blank node predicate %s.",
triple->predicate);
rdfa_free_triple(triple);
return;
}
if(triple->object_type == RDF_TYPE_NAMESPACE_PREFIX) {
#ifdef RAPTOR_DEBUG
RAPTOR_FATAL1("Triple has namespace object type\n");
#endif
rdfa_free_triple(triple);
return;
}
if((triple->subject[0] == '_') && (triple->subject[1] == ':')) {
subject_term = raptor_new_term_from_blank(parser->world,
(const unsigned char*)triple->subject + 2);
} else {
raptor_uri* subject_uri;
subject_uri = raptor_new_uri(parser->world,
(const unsigned char*)triple->subject);
subject_term = raptor_new_term_from_uri(parser->world, subject_uri);
raptor_free_uri(subject_uri);
subject_uri = NULL;
}
s->subject = subject_term;
predicate_uri = raptor_new_uri(parser->world,
(const unsigned char*)triple->predicate);
if(!predicate_uri)
goto cleanup;
predicate_term = raptor_new_term_from_uri(parser->world, predicate_uri);
raptor_free_uri(predicate_uri);
predicate_uri = NULL;
s->predicate = predicate_term;
if(triple->object_type == RDF_TYPE_IRI) {
if((triple->object[0] == '_') && (triple->object[1] == ':')) {
object_term = raptor_new_term_from_blank(parser->world,
(const unsigned char*)triple->object + 2);
} else {
raptor_uri* object_uri;
object_uri = raptor_new_uri(parser->world,
(const unsigned char*)triple->object);
if(!object_uri)
goto cleanup;
object_term = raptor_new_term_from_uri(parser->world, object_uri);
raptor_free_uri(object_uri);
}
} else if(triple->object_type == RDF_TYPE_PLAIN_LITERAL) {
object_term = raptor_new_term_from_literal(parser->world,
(const unsigned char*)triple->object,
NULL,
(const unsigned char*)triple->language);
} else if(triple->object_type == RDF_TYPE_XML_LITERAL) {
raptor_uri* datatype_uri;
datatype_uri = raptor_new_uri_from_counted_string(parser->world,
(const unsigned char*)raptor_xml_literal_datatype_uri_string,
raptor_xml_literal_datatype_uri_string_len);
object_term = raptor_new_term_from_literal(parser->world,
(const unsigned char*)triple->object,
datatype_uri,
NULL);
raptor_free_uri(datatype_uri);
} else if(triple->object_type == RDF_TYPE_TYPED_LITERAL) {
raptor_uri *datatype_uri = NULL;
const unsigned char* language = (const unsigned char*)triple->language;
if(triple->datatype) {
/* If datatype, no language allowed */
language = NULL;
datatype_uri = raptor_new_uri(parser->world,
(const unsigned char*)triple->datatype);
if(!datatype_uri)
goto cleanup;
}
object_term = raptor_new_term_from_literal(parser->world,
(const unsigned char*)triple->object,
datatype_uri,
language);
raptor_free_uri(datatype_uri);
} else {
raptor_log_error_formatted(parser->world, RAPTOR_LOG_LEVEL_ERROR, NULL,
"Triple has unknown object term type %d",
s->object->type);
goto cleanup;
}
s->object = object_term;
/* Generate statement */
(*parser->statement_handler)(parser->user_data, s);
cleanup:
rdfa_free_triple(triple);
if(subject_term)
raptor_free_term(subject_term);
if(predicate_term)
raptor_free_term(predicate_term);
if(object_term)
raptor_free_term(object_term);
}
static void
raptor_librdfa_sax2_new_namespace_handler(void *user_data,
raptor_namespace* nspace)
{
raptor_parser* rdf_parser;
rdf_parser = (raptor_parser*)user_data;
raptor_parser_start_namespace(rdf_parser, nspace);
}
static int
raptor_librdfa_parse_start(raptor_parser* rdf_parser)
{
raptor_locator *locator = &rdf_parser->locator;
raptor_librdfa_parser_context *librdfa_parser;
int rc;
char* base_uri_string = NULL;
librdfa_parser = (raptor_librdfa_parser_context*)rdf_parser->context;
locator->line = -1;
locator->column = -1;
locator->byte = 0;
if(rdf_parser->base_uri)
base_uri_string = (char*)raptor_uri_as_string(rdf_parser->base_uri);
if(librdfa_parser->context)
rdfa_free_context(librdfa_parser->context);
librdfa_parser->context = rdfa_create_context(base_uri_string);
if(!librdfa_parser->context)
return 1;
librdfa_parser->context->namespace_handler = raptor_librdfa_sax2_new_namespace_handler;
librdfa_parser->context->namespace_handler_user_data = rdf_parser;
librdfa_parser->context->world = rdf_parser->world;
librdfa_parser->context->locator = &rdf_parser->locator;
librdfa_parser->context->callback_data = rdf_parser;
/* returns triples */
rdfa_set_default_graph_triple_handler(librdfa_parser->context,
raptor_librdfa_generate_statement);
/* returns RDFa Processing Graph error triples - not used by raptor */
rdfa_set_processor_graph_triple_handler(librdfa_parser->context, NULL);
librdfa_parser->context->raptor_rdfa_version = librdfa_parser->rdfa_version;
rc = rdfa_parse_start(librdfa_parser->context);
if(rc != RDFA_PARSE_SUCCESS)
return 1;
return 0;
}
static int
raptor_librdfa_parse_chunk(raptor_parser* rdf_parser,
const unsigned char *s, size_t len,
int is_end)
{
raptor_librdfa_parser_context *librdfa_parser;
int rval;
librdfa_parser = (raptor_librdfa_parser_context*)rdf_parser->context;
rval = rdfa_parse_chunk(librdfa_parser->context, (char*)s, len, is_end);
if(is_end) {
if(rdf_parser->emitted_default_graph) {
raptor_parser_end_graph(rdf_parser, NULL, 0);
rdf_parser->emitted_default_graph--;
}
}
return rval != RDFA_PARSE_SUCCESS;
}
static int
raptor_librdfa_parse_recognise_syntax(raptor_parser_factory* factory,
const unsigned char *buffer, size_t len,
const unsigned char *identifier,
const unsigned char *suffix,
const char *mime_type)
{
int score = 0;
if(identifier) {
if(strstr((const char*)identifier, "RDFa"))
score = 10;
}
if(buffer && len) {
#define HAS_RDFA_1 (raptor_memstr((const char*)buffer, len, "-//W3C//DTD XHTML+RDFa 1.0//EN") != NULL)
#define HAS_RDFA_2 (raptor_memstr((const char*)buffer, len, "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd") != NULL)
if(HAS_RDFA_1 || HAS_RDFA_2)
score = 10;
}
return score;
}
static const char* const rdfa_names[4] = { "rdfa", "rdfa11", "rdfa10", NULL };
static const char* const rdfa_uri_strings[3] = {
"http://www.w3.org/ns/formats/RDFa",
"http://www.w3.org/TR/rdfa/",
NULL
};
#define RDFA_TYPES_COUNT 2
static const raptor_type_q html_types[RDFA_TYPES_COUNT + 1] = {
{ "text/html", 9, 6},
{ "application/xhtml+xml", 21, 8},
{ NULL, 0, 0}
};
static int
raptor_librdfa_parser_register_factory(raptor_parser_factory *factory)
{
int rc = 0;
factory->desc.names = rdfa_names;
factory->desc.mime_types = html_types;
factory->desc.label = "RDF/A via librdfa";
factory->desc.uri_strings = rdfa_uri_strings;
factory->desc.flags = 0;
factory->context_length = sizeof(raptor_librdfa_parser_context);
factory->init = raptor_librdfa_parse_init;
factory->terminate = raptor_librdfa_parse_terminate;
factory->start = raptor_librdfa_parse_start;
factory->chunk = raptor_librdfa_parse_chunk;
factory->recognise_syntax = raptor_librdfa_parse_recognise_syntax;
return rc;
}
int
raptor_init_parser_rdfa(raptor_world* world)
{
return !raptor_world_register_parser_factory(world,
&raptor_librdfa_parser_register_factory);
}
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