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|
/**
* Copyright 2008-2011 Digital Bazaar, Inc.
*
* This file is part of librdfa.
*
* librdfa is Free Software, and can be licensed under any of the
* following three licenses:
*
* 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-* at the top of this software distribution for more
* information regarding the details of each license.
*
* The librdfa library is the Fastest RDFa Parser in the Universe. It is
* a stream parser, meaning that it takes an XML data as input and spits
* out RDF triples as it comes across them in the stream. Due to this
* processing approach, librdfa has a very, very small memory footprint.
* It is also very fast and can operate on hundreds of gigabytes of XML
* data without breaking a sweat.
*
* Usage:
*
* rdfacontext* context = rdfa_create_context(BASE_URI);
* context->callback_data = your_user_data;
* rdfa_set_default_graph_triple_handler(context, &default_graph_triple);
* rdfa_set_processor_graph_triple_handler(context, &processor_graph_triple);
* rdfa_set_buffer_filler(context, &fill_buffer);
* rdfa_parse(context);
* rdfa_free_context(context);
*
* @author Manu Sporny
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <ctype.h>
#include <libxml/SAX2.h>
#include "rdfa_utils.h"
#include "rdfa.h"
#include "strtok_r.h"
#define READ_BUFFER_SIZE 4096
#define RDFA_DOCTYPE_STRING_LENGTH 103
/**
* Read the head of the XHTML document and determines the base IRI for
* the document.
*
* @param context the current working context.
* @param working_buffer the current working buffer.
* @param wb_allocated the number of bytes that have been allocated to
* the working buffer.
*
* @return the size of the data available in the working buffer.
*/
static size_t rdfa_init_base(
rdfacontext* context, char** working_buffer, size_t* working_buffer_size,
char* temp_buffer, size_t bytes_read)
{
char* head_end = NULL;
size_t offset = context->wb_position;
size_t needed_size = 0;
if((offset + bytes_read) > *working_buffer_size)
{
needed_size = (offset + bytes_read) - *working_buffer_size;
}
/* search for the end of <head>, stop if <head> was found */
/* extend the working buffer size */
if(needed_size > 0)
{
size_t temp_buffer_size = sizeof(char) * READ_BUFFER_SIZE;
if((size_t)needed_size > temp_buffer_size)
temp_buffer_size += needed_size;
*working_buffer_size += temp_buffer_size;
/* +1 for NUL at end, to allow strstr() etc. to work */
*working_buffer = (char*)realloc(*working_buffer, *working_buffer_size + 1);
}
/* append to the working buffer */
memmove(*working_buffer + offset, temp_buffer, bytes_read);
/* ensure the buffer is a NUL-terminated string */
*(*working_buffer + offset + bytes_read) = '\0';
/* Sniff the beginning of the document for any document information */
if(strstr(*working_buffer, "-//W3C//DTD XHTML+RDFa 1.0//EN") != NULL)
{
context->host_language = HOST_LANGUAGE_XHTML1;
context->rdfa_version = RDFA_VERSION_1_0;
}
else if(strstr(*working_buffer, "-//W3C//DTD XHTML+RDFa 1.1//EN") != NULL)
{
context->host_language = HOST_LANGUAGE_XHTML1;
context->rdfa_version = RDFA_VERSION_1_1;
}
else if(strstr(*working_buffer, "<html") != NULL)
{
context->host_language = HOST_LANGUAGE_HTML;
context->rdfa_version = RDFA_VERSION_1_1;
}
else
{
context->host_language = HOST_LANGUAGE_XML1;
context->rdfa_version = RDFA_VERSION_1_1;
}
#ifdef LIBRDFA_IN_RAPTOR
if(context->raptor_rdfa_version == 10) {
context->host_language = HOST_LANGUAGE_XHTML1;
context->rdfa_version = RDFA_VERSION_1_0;
} else if(context->raptor_rdfa_version == 11)
context->rdfa_version = RDFA_VERSION_1_1;
#endif
/* search for the end of </head> in */
head_end = strstr(*working_buffer, "</head>");
if(head_end == NULL)
head_end = strstr(*working_buffer, "</HEAD>");
context->wb_position += bytes_read;
if(head_end == NULL)
return bytes_read;
/* if </head> was found, search for <base and extract the base URI */
if(head_end != NULL)
{
char* base_start = strstr(*working_buffer, "<base ");
char* href_start = NULL;
if(base_start == NULL)
base_start = strstr(*working_buffer, "<BASE ");
if(base_start != NULL)
href_start = strstr(base_start, "href=");
if(href_start != NULL)
{
char sep = href_start[5];
char* uri_start = href_start + 6;
char* uri_end = strchr(uri_start, sep);
if(uri_end != NULL)
{
if(*uri_start != sep)
{
size_t uri_size = uri_end - uri_start;
char* temp_uri = (char*)malloc(sizeof(char) * uri_size + 1);
char* cleaned_base;
strncpy(temp_uri, uri_start, uri_size);
temp_uri[uri_size] = '\0';
/* TODO: This isn't in the processing rules, should it
* be? Setting current_object_resource will make
* sure that the BASE element is inherited by all
* subcontexts. */
cleaned_base = rdfa_iri_get_base(temp_uri);
context->current_object_resource =
rdfa_replace_string(
context->current_object_resource, cleaned_base);
/* clean up the base context */
context->base =
rdfa_replace_string(context->base, cleaned_base);
free(cleaned_base);
free(temp_uri);
}
}
}
}
return bytes_read;
}
#ifdef LIBRDFA_IN_RAPTOR
static int
raptor_nspace_compare(const void *a, const void *b)
{
raptor_namespace* ns_a=*(raptor_namespace**)a;
raptor_namespace* ns_b=*(raptor_namespace**)b;
if(!ns_a->prefix)
return 1;
else if(!ns_b->prefix)
return -1;
else
return strcmp((const char*)ns_b->prefix, (const char*)ns_a->prefix);
}
#endif
/**
* Handles the start_element call
*/
static void start_element(void *parser_context, const char* name,
const char* prefix, const char* URI, int nb_namespaces,
const char** namespaces, int nb_attributes, int nb_defaulted,
const char** attributes)
{
rdfacontext* root_context = (rdfacontext*)parser_context;
rdfalist* context_stack = (rdfalist*)root_context->context_stack;
rdfacontext* context = rdfa_create_new_element_context(context_stack);
char* xml_lang = NULL;
const char* about_curie = NULL;
char* about = NULL;
const char* src_curie = NULL;
char* src = NULL;
const char* type_of_curie = NULL;
rdfalist* type_of = NULL;
const char* rel_curie = NULL;
rdfalist* rel = NULL;
const char* rev_curie = NULL;
rdfalist* rev = NULL;
const char* property_curie = NULL;
rdfalist* property = NULL;
const char* resource_curie = NULL;
char* resource = NULL;
const char* href_curie = NULL;
char* href = NULL;
char* content = NULL;
const char* datatype_curie = NULL;
char* datatype = NULL;
#ifdef LIBRDFA_IN_RAPTOR
if(1) {
raptor_parser* rdf_parser = (raptor_parser*)context->callback_data;
raptor_sax2_update_document_locator(context->sax2,
&rdf_parser->locator);
}
#endif
rdfa_push_item(context_stack, context, RDFALIST_FLAG_CONTEXT);
#if defined(DEBUG) && DEBUG > 0
if(1) {
int i;
/* dump all arguments sent to this callback */
fprintf(stdout, "DEBUG: SAX.startElementNs(%s", (char *) name);
if (prefix == NULL)
fprintf(stdout, ", NULL");
else
fprintf(stdout, ", %s", (char *) prefix);
if (URI == NULL)
fprintf(stdout, ", NULL");
else
fprintf(stdout, ", '%s'", (char *) URI);
fprintf(stdout, ", %d", nb_namespaces);
/* dump all namespaces */
if (namespaces != NULL) {
for (i = 0;i < nb_namespaces * 2;i++) {
fprintf(stdout, ", xmlns");
if (namespaces[i] != NULL)
fprintf(stdout, ":%s", namespaces[i]);
i++;
fprintf(stdout, "='%s'", namespaces[i]);
}
}
/* dump all attributes */
fprintf(stdout, ", %d, %d", nb_attributes, nb_defaulted);
if (attributes != NULL) {
for (i = 0;i < nb_attributes * 5;i += 5) {
if (attributes[i + 1] != NULL)
fprintf(
stdout, ", %s:%s='", attributes[i + 1], attributes[i]);
else
fprintf(stdout, ", %s='", attributes[i]);
fprintf(stdout, "%.4s...', %d", attributes[i + 3],
(int)(attributes[i + 4] - attributes[i + 3]));
}
}
fprintf(stdout, ")\n");
}
#endif
/* start the XML Literal text */
if(context->xml_literal == NULL)
{
context->xml_literal = rdfa_replace_string(context->xml_literal, "<");
context->xml_literal_size = 1;
}
else
{
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, "<", 1);
}
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
name, strlen(name));
if(!context->xml_literal_namespaces_defined)
{
/* append namespaces to XML Literal */
#ifdef LIBRDFA_IN_RAPTOR
raptor_namespace_stack* nstack = &context->sax2->namespaces;
raptor_namespace* ns;
raptor_namespace** ns_list = NULL;
size_t ns_size;
#else
void** umap = context->uri_mappings;
#endif
const char* umap_key = NULL;
void* umap_value = NULL;
/* if the namespaces are not defined, then neither is the xml:lang */
context->xml_literal_xml_lang_defined = 0;
#ifdef LIBRDFA_IN_RAPTOR
ns_size = 0;
ns_list = raptor_namespace_stack_to_array(nstack, &ns_size);
qsort((void*)ns_list, ns_size, sizeof(raptor_namespace*),
raptor_nspace_compare);
while(ns_size > 0)
#else
while(*umap != NULL)
#endif
{
unsigned char insert_xmlns_definition = 1;
const char* attr = NULL;
/* get the next mapping to process */
#ifdef LIBRDFA_IN_RAPTOR
ns=ns_list[--ns_size];
umap_key = (const char*)raptor_namespace_get_prefix(ns);
if(!umap_key)
umap_key=(const char*)XMLNS_DEFAULT_MAPPING;
umap_value = (char*)raptor_uri_as_string(raptor_namespace_get_uri(ns));
#else
rdfa_next_mapping(umap++, &umap_key, &umap_value);
umap++;
#endif
/* check to make sure that the namespace isn't already
* defined in the current element. */
if(attributes != NULL)
{
const char** attrs = attributes;
while((*attrs != NULL) && insert_xmlns_definition)
{
attr = *attrs++;
/* if the attribute is a umap_key, skip the definition
* of the attribute. */
if(strcmp(attr, umap_key) == 0)
{
insert_xmlns_definition = 0;
}
}
}
/* if the namespace isn't already defined on the element,
* copy it to the XML Literal string. */
if(insert_xmlns_definition)
{
/* append the namespace attribute to the XML Literal */
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
" xmlns", strlen(" xmlns"));
/* check to see if we're dumping the standard XHTML namespace or
* a user-defined XML namespace */
if(strcmp(umap_key, XMLNS_DEFAULT_MAPPING) != 0)
{
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, ":", 1);
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
umap_key, strlen(umap_key));
}
/* append the namespace value */
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, "=\"", 2);
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
(const char*)umap_value, strlen((char*)umap_value));
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, "\"", 1);
}
} /* end while umap not NULL */
context->xml_literal_namespaces_defined = 1;
#ifdef LIBRDFA_IN_RAPTOR
if(ns_list)
raptor_free_memory(ns_list);
#endif
} /* end if namespaces inserted */
#ifdef LIBRDFA_IN_RAPTOR
/* Raptor namespace code does this already */
#else
/* 3. For backward compatibility, RDFa Processors should also permit the
* definition of mappings via @xmlns. In this case, the value to be mapped
* is set by the XML namespace prefix, and the value to map is the value of
* the attribute - an IRI. (Note that prefix mapping via @xmlns is
* deprecated, and may be removed in a future version of this
* specification.) When xmlns is supported, such mappings must be processed
* before processing any mappings from @prefix on the same element. */
if(namespaces != NULL)
{
int ni;
for(ni = 0; ni < nb_namespaces * 2; ni += 2)
{
const char* ns = namespaces[ni];
const char* value = namespaces[ni + 1];
/* Regardless of how the mapping is declared, the value to be mapped
* must be converted to lower case, and the IRI is not processed in
* any way; in particular if it is a relative path it must not be
* resolved against the current base. */
char* lcns = NULL;
if(ns != NULL)
{
/* convert the namespace string to lowercase */
unsigned int i;
size_t ns_length = strlen(ns);
lcns = (char*)malloc(ns_length + 1);
for(i = 0; i <= ns_length; i++)
{
lcns[i] = tolower(ns[i]);
}
}
/* update the URI mappings */
rdfa_update_uri_mappings(context, lcns, value);
if(lcns != NULL)
{
free(lcns);
}
}
}
#endif
/* detect the RDFa version of the document, if specified */
if(attributes != NULL)
{
int ci;
/* search for a version attribute */
for(ci = 0; ci < nb_attributes * 5; ci += 5)
{
const char* attr;
char* value;
size_t value_length = 0;
attr = attributes[ci];
value_length = attributes[ci + 4] - attributes[ci + 3] + 1;
if(strcmp(attr, "version") == 0)
{
/* append the attribute-value pair to the XML literal */
value = (char*)malloc(value_length + 1);
snprintf(value, value_length, "%s", attributes[ci + 3]);
if(strstr(value, "RDFa 1.0") != NULL)
{
context->rdfa_version = RDFA_VERSION_1_0;
}
else if(strstr(value, "RDFa 1.1") != NULL)
{
context->rdfa_version = RDFA_VERSION_1_1;
}
free(value);
}
}
}
#ifdef LIBRDFA_IN_RAPTOR
if(context->sax2)
{
/* Raptor handles xml:lang itself but not 'lang' */
xml_lang = (char*)raptor_sax2_inscope_xml_language(context->sax2);
xml_lang = rdfa_replace_string(NULL, xml_lang);
}
#endif
/* prepare all of the RDFa-specific attributes we are looking for.
* scan all of the attributes for the RDFa-specific attributes */
if(attributes != NULL)
{
int ci;
if(context->rdfa_version == RDFA_VERSION_1_1)
{
/* process all vocab and prefix attributes */
for(ci = 0; ci < nb_attributes * 5; ci += 5)
{
const char* attr;
char* value;
size_t value_length = 0;
attr = attributes[ci];
value_length = attributes[ci + 4] - attributes[ci + 3] + 1;
/* append the attribute-value pair to the XML literal */
value = (char*)malloc(value_length + 1);
snprintf(value, value_length, "%s", attributes[ci + 3]);
/* 2. Next the current element is examined for any change to the
* default vocabulary via @vocab. */
if(strcmp(attr, "vocab") == 0)
{
if(strlen(value) < 1)
{
/* If the value is empty, then the local default vocabulary
* must be reset to the Host Language defined default
* (if any). */
free(context->default_vocabulary);
context->default_vocabulary = NULL;
}
else
{
char* resolved_uri;
rdftriple* triple;
/* If @vocab is present and contains a value, the local
* default vocabulary is updated according to the
* section on CURIE and IRI Processing. */
resolved_uri = rdfa_resolve_uri(context, value);
context->default_vocabulary = rdfa_replace_string(
context->default_vocabulary, resolved_uri);
/* The value of @vocab is used to generate a triple */
triple = rdfa_create_triple(
context->base, "http://www.w3.org/ns/rdfa#usesVocabulary",
resolved_uri, RDF_TYPE_IRI, NULL, NULL);
context->default_graph_triple_callback(
triple, context->callback_data);
free(resolved_uri);
}
}
else if(strcmp(attr, "prefix") == 0)
{
/* Mappings are defined via @prefix. */
char* working_string = NULL;
char* atprefix = NULL;
char* iri = NULL;
char* saveptr = NULL;
working_string = rdfa_replace_string(working_string, value);
/* Values in this attribute are evaluated from beginning to
* end (e.g., left to right in typical documents). */
atprefix = strtok_r(working_string, ":", &saveptr);
while(atprefix != NULL)
{
/* find the prefix and IRI mappings while skipping whitespace */
while((*saveptr == ' ' || *saveptr == '\n' ||
*saveptr == '\r' || *saveptr == '\t' || *saveptr == '\f' ||
*saveptr == '\v') && *saveptr != '\0')
{
saveptr++;
}
iri = strtok_r(NULL, RDFA_WHITESPACE, &saveptr);
/* update the prefix mappings */
rdfa_update_uri_mappings(context, atprefix, iri);
if(!saveptr)
break;
while((*saveptr == ' ' || *saveptr == '\n' ||
*saveptr == '\r' || *saveptr == '\t' || *saveptr == '\f' ||
*saveptr == '\v') && *saveptr != '\0')
{
saveptr++;
}
/* get the next prefix to process */
atprefix = strtok_r(NULL, ":", &saveptr);
}
free(working_string);
}
else if(strcmp(attr, "inlist") == 0)
{
context->inlist_present = 1;
}
free(value);
}
}
/* resolve all of the other RDFa values */
for(ci = 0; ci < nb_attributes * 5; ci += 5)
{
const char* attr;
char* value;
char* attrns;
char* literal_text;
size_t value_length = 0;
size_t literal_text_length;
attr = attributes[ci];
attrns = (char*)attributes[ci + 1];
value_length = attributes[ci + 4] - attributes[ci + 3] + 1;
/* append the attribute-value pair to the XML literal */
value = (char*)malloc(value_length + 1);
snprintf(value, value_length, "%s", attributes[ci + 3]);
literal_text_length = strlen(attr) + value_length + 4;
literal_text = (char*)malloc(literal_text_length + 1);
snprintf(literal_text, literal_text_length, " %s=\"%s\"", attr, value);
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
literal_text, strlen(literal_text));
free(literal_text);
/* if xml:lang is defined, ensure that it is not overwritten */
if(attrns != NULL && strcmp(attrns, "xml") == 0 &&
strcmp(attr, "lang") == 0)
{
context->xml_literal_xml_lang_defined = 1;
}
/* process all of the RDFa attributes */
if(strcmp(attr, "about") == 0)
{
about_curie = value;
about = rdfa_resolve_curie(
context, about_curie, CURIE_PARSE_ABOUT_RESOURCE);
}
else if(strcmp(attr, "src") == 0)
{
src_curie = value;
src = rdfa_resolve_curie(context, src_curie, CURIE_PARSE_HREF_SRC);
}
else if(strcmp(attr, "typeof") == 0)
{
type_of_curie = value;
type_of = rdfa_resolve_curie_list(
context, type_of_curie,
CURIE_PARSE_INSTANCEOF_DATATYPE);
}
else if(strcmp(attr, "rel") == 0)
{
context->rel_present = 1;
rel_curie = value;
rel = rdfa_resolve_curie_list(
context, rel_curie, CURIE_PARSE_RELREV);
}
else if(strcmp(attr, "rev") == 0)
{
context->rev_present = 1;
rev_curie = value;
rev = rdfa_resolve_curie_list(
context, rev_curie, CURIE_PARSE_RELREV);
}
else if(strcmp(attr, "property") == 0)
{
property_curie = value;
property =
rdfa_resolve_curie_list(
context, property_curie, CURIE_PARSE_PROPERTY);
}
else if(strcmp(attr, "resource") == 0)
{
resource_curie = value;
resource = rdfa_resolve_curie(
context, resource_curie, CURIE_PARSE_ABOUT_RESOURCE);
}
else if(strcmp(attr, "href") == 0)
{
href_curie = value;
href =
rdfa_resolve_curie(context, href_curie, CURIE_PARSE_HREF_SRC);
}
else if(strcmp(attr, "content") == 0)
{
content = rdfa_replace_string(content, value);
}
else if(strcmp(attr, "datatype") == 0)
{
datatype_curie = value;
if(strlen(datatype_curie) == 0)
{
datatype = rdfa_replace_string(datatype, "");
}
else
{
datatype = rdfa_resolve_curie(context, datatype_curie,
CURIE_PARSE_INSTANCEOF_DATATYPE);
}
}
else if((attrns == NULL && strcmp(attr, "lang") == 0) ||
(attrns != NULL && strcmp(attrns, "xml") == 0 &&
strcmp(attr, "lang") == 0))
{
xml_lang = rdfa_replace_string(xml_lang, value);
}
free(value);
}
}
/* The root element has an implicit @about declaration */
if(context->depth == 1 && about == NULL && resource == NULL &&
href == NULL && src == NULL)
{
about_curie = "";
about = rdfa_resolve_curie(
context, about_curie, CURIE_PARSE_ABOUT_RESOURCE);
}
/* The HEAD and BODY element in XHTML and HTML has an implicit
* about="" on it.
*/
if(about == NULL && resource == NULL && href == NULL && src == NULL &&
(context->parent_subject == NULL || type_of != NULL) &&
((context->host_language == HOST_LANGUAGE_XHTML1 ||
context->host_language == HOST_LANGUAGE_HTML) &&
(strcasecmp(name, "head") == 0 || strcasecmp(name, "body") == 0)))
{
about_curie = "";
about = rdfa_resolve_curie(
context, about_curie, CURIE_PARSE_ABOUT_RESOURCE);
}
/* check to see if we should append an xml:lang to the XML Literal
* if one is defined in the context and does not exist on the
* element. */
if((xml_lang == NULL) && (context->language != NULL) &&
!context->xml_literal_xml_lang_defined)
{
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
" xml:lang=\"", strlen(" xml:lang=\""));
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
context->language, strlen(context->language));
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, "\"", 1);
/* ensure that the lang isn't set in a subtree (unless it's overwritten) */
context->xml_literal_xml_lang_defined = 1;
}
/* close the XML Literal value */
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, ">", 1);
/* 3. The [current element] is also parsed for any language
* information, and [language] is set in the [current
* evaluation context]; */
rdfa_update_language(context, xml_lang);
/***************** FOR DEBUGGING PURPOSES ONLY ******************/
#if defined(DEBUG) && DEBUG > 0
printf("DEBUG: depth = %u\n", context->depth);
if(about != NULL)
{
printf("DEBUG: @about = %s\n", about);
}
if(src != NULL)
{
printf("DEBUG: @src = %s\n", src);
}
if(type_of != NULL)
{
printf("DEBUG: @type_of = ");
rdfa_print_list(type_of);
}
if(context->inlist_present)
{
printf("DEBUG: @inlist = true\n");
}
if(rel != NULL)
{
printf("DEBUG: @rel = ");
rdfa_print_list(rel);
}
if(rev != NULL)
{
printf("DEBUG: @rev = ");
rdfa_print_list(rev);
}
if(property != NULL)
{
printf("DEBUG: @property = ");
rdfa_print_list(property);
}
if(resource != NULL)
{
printf("DEBUG: @resource = %s\n", resource);
}
if(href != NULL)
{
printf("DEBUG: @href = %s\n", href);
}
if(content != NULL)
{
printf("DEBUG: @content = %s\n", content);
}
if(datatype != NULL)
{
printf("DEBUG: @datatype = %s\n", datatype);
}
if(xml_lang != NULL)
{
printf("DEBUG: @xml:lang = %s\n", xml_lang);
}
#endif
/* TODO: This isn't part of the processing model, it needs to be
* included and is a correction for the last item in step #4. */
if((about == NULL) && (src == NULL) && (type_of == NULL) &&
(rel == NULL) && (rev == NULL) && (property == NULL) &&
(resource == NULL) && (href == NULL) &&
(context->default_vocabulary == NULL) && (prefix == NULL))
{
context->skip_element = 1;
}
if((rel == NULL) && (rev == NULL))
{
if(context->rdfa_version == RDFA_VERSION_1_0)
{
/* 4. If the [current element] contains no valid @rel or @rev
* URI, obtained according to the section on CURIE and URI
* Processing, then the next step is to establish a value for
* [new subject]. Any of the attributes that can carry a
* resource can set [new subject]; */
rdfa_establish_new_1_0_subject(
context, name, about, src, resource, href, type_of);
}
else
{
rdfa_establish_new_1_1_subject(
context, name, about, src, resource, href, type_of, property,
content, datatype);
}
}
else
{
if(context->rdfa_version == RDFA_VERSION_1_0)
{
/* 5. If the [current element] does contain a valid @rel or @rev
* URI, obtained according to the section on CURIE and URI
* Processing, then the next step is to establish both a value
* for [new subject] and a value for [current object resource]: */
rdfa_establish_new_1_0_subject_with_relrev(
context, name, about, src, resource, href, type_of);
}
else
{
rdfa_establish_new_1_1_subject_with_relrev(
context, name, about, src, resource, href, type_of);
}
}
if(context->new_subject != NULL)
{
#if defined(DEBUG) && DEBUG > 0
printf("DEBUG: new_subject = %s\n", context->new_subject);
#endif
/* RDFa 1.0: 6. If in any of the previous steps a [new subject] was set
* to a non-null value, it is now used to provide a subject for
* type values; */
/* RDFa 1.1: 7. If in any of the previous steps a typed resource was set
* to a non-null value, it is now used to provide a subject for type
* values;
*/
if(type_of != NULL)
{
rdfa_complete_type_triples(context, type_of);
}
/* Note that none of this block is executed if there is no
* [new subject] value, i.e., [new subject] remains null. */
}
if(context->current_object_resource != NULL)
{
/* If the element contains both the @inlist and the @rel attributes:
* the @rel may contain one or more resources, obtained according to
* the section on CURIE and IRI Processing each of which is used to
* add an entry to the list mapping as follows:
* if the local list mapping does not contain a list associated with
* the IRI, instantiate a new list and add to local list mappings
* add the current object resource to the list associated with the
* resource in the local list mapping */
if(context->rdfa_version == RDFA_VERSION_1_1 && (rel != NULL) &&
context->inlist_present)
{
rdfresource_t object_type = RDF_TYPE_IRI;
if((property != NULL) || (content != NULL))
{
object_type = RDF_TYPE_PLAIN_LITERAL;
if(datatype != NULL)
{
object_type = RDF_TYPE_TYPED_LITERAL;
}
}
rdfa_establish_new_inlist_triples(
context, rel, context->current_object_resource, object_type);
}
/* 7. If in any of the previous steps a [current object resource]
* was set to a non-null value, it is now used to generate triples */
rdfa_complete_relrev_triples(context, rel, rev);
}
if((context->current_object_resource == NULL) &&
context->rdfa_version == RDFA_VERSION_1_1 && (rel != NULL) &&
context->inlist_present)
{
rdfa_save_incomplete_list_triples(context, rel);
}
else if((context->current_object_resource == NULL) &&
((rel != NULL) || (rev != NULL)))
{
/* 8. If however [current object resource] was set to null, but
* there are predicates present, then they must be stored as
* [incomplete triple]s, pending the discovery of a subject that
* can be used as the object. Also, [current object resource]
* should be set to a newly created [bnode] */
rdfa_save_incomplete_triples(context, rel, rev);
}
/* Ensure to re-insert XML Literal namespace information from this
* point on... */
if(property != NULL)
{
context->xml_literal_namespaces_defined = 0;
}
/* save these for processing steps #9 and #10 */
context->about = rdfa_replace_string(context->about, about);
context->resource = rdfa_replace_string(context->resource, resource);
context->href = rdfa_replace_string(context->href, href);
context->src = rdfa_replace_string(context->src, src);
context->content = rdfa_replace_string(context->content, content);
context->datatype = rdfa_replace_string(context->datatype, datatype);
context->property = property;
/* free the resolved CURIEs */
free(about);
free(src);
rdfa_free_list(type_of);
rdfa_free_list(rel);
rdfa_free_list(rev);
free(xml_lang);
free(content);
free(resource);
free(href);
free(datatype);
}
static void character_data(
void *parser_context, const xmlChar *s, int len)
{
/*xmlParserCtxtPtr parser = (xmlParserCtxtPtr)parser_context;*/
rdfalist* context_stack =
(rdfalist*)((rdfacontext*)parser_context)->context_stack;
rdfacontext* context = (rdfacontext*)
context_stack->items[context_stack->num_items - 1]->data;
char *buffer = (char*)malloc(len + 1);
memset(buffer, 0, len + 1);
memcpy(buffer, s, len);
/* append the text to the current context's plain literal */
if(context->plain_literal == NULL)
{
context->plain_literal =
rdfa_replace_string(context->plain_literal, buffer);
context->plain_literal_size = len;
}
else
{
context->plain_literal = rdfa_n_append_string(
context->plain_literal,
&context->plain_literal_size, buffer, len);
}
/* append the text to the current context's XML literal */
if(context->xml_literal == NULL)
{
context->xml_literal =
rdfa_replace_string(context->xml_literal, buffer);
context->xml_literal_size = len;
}
else
{
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size, buffer, len);
}
/*printf("plain_literal: %s\n", context->plain_literal);*/
/*printf("xml_literal: %s\n", context->xml_literal);*/
free(buffer);
}
static void end_element(void* parser_context, const char* name,
const char* prefix,const xmlChar* URI)
{
/*xmlParserCtxtPtr parser = (xmlParserCtxtPtr)parser_context;*/
rdfalist* context_stack =
(rdfalist*)((rdfacontext*)parser_context)->context_stack;
rdfacontext* context = (rdfacontext*)rdfa_pop_item(context_stack);
rdfacontext* parent_context = (rdfacontext*)
context_stack->items[context_stack->num_items - 1]->data;
/* append the text to the current context's XML literal */
size_t name_len = strlen(name);
char* buffer = (char*)malloc(name_len + 3 + 1);
#if defined(DEBUG) && DEBUG > 0
printf("DEBUG: </%s>\n", name);
printf("context->local_list_mappings (start of end_element): ");
rdfa_print_mapping(context->local_list_mappings,
(print_mapping_value_fp)rdfa_print_triple_list);
#endif
buffer[0] = '<';
buffer[1] = '/';
memcpy(buffer + 2, name, name_len);
buffer[name_len + 2] = '>';
buffer[name_len + 3] = '\0';
if(context->xml_literal == NULL)
{
context->xml_literal =
rdfa_replace_string(context->xml_literal, buffer);
context->xml_literal_size = strlen(buffer);
}
else
{
context->xml_literal = rdfa_n_append_string(
context->xml_literal, &context->xml_literal_size,
buffer, strlen(buffer));
}
free(buffer);
/* 9. The next step of the iteration is to establish any
* [current object literal]; */
/* generate the complete object literal triples */
if(context->property != NULL)
{
/* save the current xml literal */
char* saved_xml_literal = context->xml_literal;
char* content_start = NULL;
char* content_end = NULL;
/* ensure to mark only the inner-content of the XML node for
* processing the object literal. */
buffer = NULL;
if(context->xml_literal != NULL)
{
/* get the data between the first tag and the last tag */
content_start = strchr(context->xml_literal, '>');
content_end = strrchr(context->xml_literal, '<');
if((content_start != NULL) && (content_end != NULL))
{
/* set content end to null terminator */
context->xml_literal = ++content_start;
*content_end = '\0';
}
}
/* update the plain literal if the XML Literal is an empty string */
if(context->xml_literal != NULL && strlen(context->xml_literal) == 0)
{
context->plain_literal =
rdfa_replace_string(context->plain_literal, "");
}
/* process data between first tag and last tag
* this needs the xml literal to be null terminated */
if(context->rdfa_version == RDFA_VERSION_1_0)
{
rdfa_complete_object_literal_triples(context);
}
else
{
rdfa_complete_current_property_value_triples(context);
}
if(content_end != NULL)
{
/* set content end back */
*content_end = '<';
}
if(saved_xml_literal != NULL)
{
/* restore xml literal */
context->xml_literal = saved_xml_literal;
}
}
/*printf(context->plain_literal);*/
if(parent_context != NULL) {
/* append the XML literal and plain text literals to the parent
* literals */
if(context->xml_literal != NULL)
{
if(parent_context->xml_literal == NULL)
{
parent_context->xml_literal =
rdfa_replace_string(
parent_context->xml_literal, context->xml_literal);
parent_context->xml_literal_size = context->xml_literal_size;
}
else
{
parent_context->xml_literal =
rdfa_n_append_string(
parent_context->xml_literal,
&parent_context->xml_literal_size,
context->xml_literal, context->xml_literal_size);
}
/* if there is an XML literal, there is probably a plain literal */
if(context->plain_literal != NULL)
{
if(parent_context->plain_literal == NULL)
{
parent_context->plain_literal =
rdfa_replace_string(
parent_context->plain_literal, context->plain_literal);
parent_context->plain_literal_size =
context->plain_literal_size;
}
else
{
parent_context->plain_literal =
rdfa_n_append_string(
parent_context->plain_literal,
&parent_context->plain_literal_size,
context->plain_literal,
context->plain_literal_size);
}
}
}
/* preserve the bnode count by copying it to the parent_context */
parent_context->bnode_count = context->bnode_count;
parent_context->underscore_colon_bnode_name = \
rdfa_replace_string(parent_context->underscore_colon_bnode_name,
context->underscore_colon_bnode_name);
}
/* 10. If the [ skip element ] flag is 'false', and [ new subject ]
* was set to a non-null value, then any [ incomplete triple ]s
* within the current context should be completed: */
if((context->skip_element == 0) && (context->new_subject != NULL))
{
rdfa_complete_incomplete_triples(context);
}
/* 14. Once all the child elements have been traversed, list triples are
* generated, if necessary. */
if(context->rdfa_version == RDFA_VERSION_1_1 && (context->new_subject != NULL))
{
rdfa_complete_list_triples(context);
if(parent_context != NULL)
{
/* copy the current mapping to the parent mapping */
rdfa_free_mapping(parent_context->local_list_mappings,
(free_mapping_value_fp)rdfa_free_list);
parent_context->local_list_mappings = rdfa_copy_mapping(
(void**)context->local_list_mappings,
(copy_mapping_value_fp)rdfa_replace_list);
#if defined(DEBUG) && DEBUG > 0
printf("parent_context->local_list_mappings (after copy): ");
rdfa_print_mapping(context->local_list_mappings,
(print_mapping_value_fp)rdfa_print_triple_list);
#endif
rdfa_free_mapping(context->local_list_mappings,
(free_mapping_value_fp)rdfa_free_list);
context->local_list_mappings = NULL;
}
}
/* free the context */
rdfa_free_context(context);
#if defined(DEBUG) && DEBUG > 0
printf("-------------------------------------------------------------\n");
#endif
}
void rdfa_set_default_graph_triple_handler(
rdfacontext* context, triple_handler_fp th)
{
context->default_graph_triple_callback = th;
}
void rdfa_set_processor_graph_triple_handler(
rdfacontext* context, triple_handler_fp th)
{
context->processor_graph_triple_callback = th;
}
void rdfa_set_buffer_filler(rdfacontext* context, buffer_filler_fp bf)
{
context->buffer_filler_callback = bf;
}
#ifdef LIBRDFA_IN_RAPTOR
/* Raptor reports its errors a different way */
#else
static void rdfa_report_error(void* parser_context, char* msg, ...)
{
char error[1024];
char* eptr;
va_list args;
rdfacontext* context = (rdfacontext*)parser_context;
/* format the error message */
va_start(args, msg);
vsprintf(error, msg, args);
va_end(args);
/* Remove any newlines from the libxml2 error */
eptr = error;
while(*eptr != '\0')
{
if(*eptr == '\n')
{
*eptr = '.';
}
eptr++;
}
/* Generate the processor error */
rdfa_processor_triples(context, RDFA_PROCESSOR_ERROR, error);
}
#endif
#ifdef LIBRDFA_IN_RAPTOR
static void raptor_rdfa_start_element(void *user_data,
raptor_xml_element *xml_element)
{
raptor_qname* qname = raptor_xml_element_get_name(xml_element);
int nb_attributes = raptor_xml_element_get_attributes_count(xml_element);
raptor_qname** attrs = raptor_xml_element_get_attributes(xml_element);
unsigned char* localname = raptor_qname_to_counted_name(qname, NULL);
const raptor_namespace* qname_ns = raptor_qname_get_namespace(qname);
int nb_namespaces = 0;
const char** namespaces = NULL;
int nb_defaulted = 0;
char** attr = NULL;
int i;
const char* ns_name = NULL;
const char* ns_uri = NULL;
if(nb_attributes > 0) {
/* Everything written into 'attr' is a shared pointer into
* xml_element or contained objects - qnames, namespaces, uris
* and values
*/
attr = (char**)malloc(sizeof(char*) * (1 + (nb_attributes * 5)));
for(i = 0; i < nb_attributes; i++) {
const raptor_namespace* attr_ns = attrs[i]->nspace;
char** attri = &attr[5 * i];
/* 5 tuple: (localname, prefix, URI, value, end) */
attri[0] = (char*)attrs[i]->local_name;
attri[1] = attr_ns ? (char*)attr_ns->prefix : NULL;
attri[2] = attr_ns ? (char*)raptor_uri_as_string(attr_ns->uri) : NULL;
attri[3] = (char*)attrs[i]->value;
attri[4] = attri[3] + attrs[i]->value_length;
}
attr[5 * i] = NULL;
}
/*
* @ctx: the user data (XML parser context)
* @localname: the local name of the element
* @prefix: the element namespace prefix if available
* @URI: the element namespace name if available
* @nb_namespaces: number of namespace definitions on that node
* @namespaces: pointer to the array of prefix/URI pairs namespace definitions
* @nb_attributes: the number of attributes on that node
* @nb_defaulted: the number of defaulted attributes. The defaulted
* ones are at the end of the array
* @attributes: pointer to the array of (localname/prefix/URI/value/end)
* attribute values.
*/
if(qname_ns) {
ns_name = (const char*)raptor_namespace_get_prefix(qname_ns);
ns_uri = (const char*)raptor_uri_as_string(qname_ns->uri);
}
start_element(user_data, (const char*)localname,
ns_name,
ns_uri,
nb_namespaces,
(const char**)namespaces,
nb_attributes,
nb_defaulted,
(const char**)attr);
if(attr)
free(attr);
raptor_free_memory(localname);
}
static void raptor_rdfa_end_element(void *user_data,
raptor_xml_element* xml_element)
{
raptor_qname* qname = raptor_xml_element_get_name(xml_element);
unsigned char* localname = raptor_qname_to_counted_name(qname, NULL);
const raptor_namespace* qname_ns = raptor_qname_get_namespace(qname);
if(qname_ns)
end_element(user_data, (const char*)localname,
(const char*)qname_ns->prefix,
(const xmlChar*)raptor_uri_as_string(qname_ns->uri));
else
end_element(user_data, (const char*)localname, NULL, NULL);
raptor_free_memory(localname);
}
static void raptor_rdfa_character_data(void *user_data,
raptor_xml_element* xml_element,
const unsigned char *s, int len)
{
character_data(user_data, (const xmlChar *)s, len);
}
static void raptor_rdfa_namespace_handler(void *user_data,
raptor_namespace* nspace)
{
rdfacontext* context = (rdfacontext*)user_data;
if(context->namespace_handler)
(*context->namespace_handler)(context->namespace_handler_user_data,
nspace);
}
#endif
int rdfa_parse_start(rdfacontext* context)
{
/* create the buffers and expat parser */
int rval = RDFA_PARSE_SUCCESS;
context->wb_allocated = sizeof(char) * READ_BUFFER_SIZE;
/* +1 for NUL at end, to allow strstr() etc. to work
* malloc - only the first char needs to be NUL */
context->working_buffer = (char*)malloc(context->wb_allocated + 1);
*context->working_buffer = '\0';
context->done = 0;
context->context_stack = rdfa_create_list(32);
/* initialize the context stack */
rdfa_push_item(context->context_stack, context, RDFALIST_FLAG_CONTEXT);
#ifdef LIBRDFA_IN_RAPTOR
context->sax2 = raptor_new_sax2(context->world, context->locator,
context);
#else
/* init libxml2 */
xmlInitParser();
#endif
/* set up the context stack */
#ifdef LIBRDFA_IN_RAPTOR
raptor_sax2_set_start_element_handler(context->sax2,
raptor_rdfa_start_element);
raptor_sax2_set_end_element_handler(context->sax2,
raptor_rdfa_end_element);
raptor_sax2_set_characters_handler(context->sax2,
raptor_rdfa_character_data);
raptor_sax2_set_namespace_handler(context->sax2,
raptor_rdfa_namespace_handler);
#endif
rdfa_init_context(context);
#ifdef LIBRDFA_IN_RAPTOR
context->base_uri = raptor_new_uri(context->sax2->world,
(const unsigned char*)context->base);
raptor_sax2_parse_start(context->sax2, context->base_uri);
#endif
return rval;
}
int rdfa_parse_chunk(rdfacontext* context, char* data, size_t wblen, int done)
{
#ifdef LIBRDFA_IN_RAPTOR
#else
xmlSAXHandler handler;
xmlParserCtxtPtr parser;
#endif
/* it is an error to call this before rdfa_parse_start() */
if(context->done)
{
return RDFA_PARSE_FAILED;
}
if(!context->preread)
{
/* search for the <base> tag and use the href contained therein to
* set the parsing context. */
context->wb_preread = rdfa_init_base(context,
&context->working_buffer, &context->wb_allocated, data, wblen);
/* continue looking if in first 131072 bytes of data */
if(!context->base && context->wb_preread < (1<<17))
return RDFA_PARSE_SUCCESS;
#ifdef LIBRDFA_IN_RAPTOR
/* term mappings are needed before SAX2 parsing */
rdfa_setup_initial_context(context);
if(raptor_sax2_parse_chunk(context->sax2,
(const unsigned char*)context->working_buffer,
context->wb_position, done))
{
return RDFA_PARSE_FAILED;
}
#else
/* create the SAX2 handler structure */
memset(&handler, 0, sizeof(xmlSAXHandler));
handler.initialized = XML_SAX2_MAGIC;
handler.startElementNs = (startElementNsSAX2Func)start_element;
handler.endElementNs = (endElementNsSAX2Func)end_element;
handler.characters = (charactersSAXFunc)character_data;
handler.error = (errorSAXFunc)rdfa_report_error;
/* create a push-based parser */
parser = xmlCreatePushParserCtxt(
&handler, context, (const char*)context->working_buffer,
context->wb_position, NULL);
/* ensure that entity substitution is turned on by default */
xmlSubstituteEntitiesDefault(1);
context->parser = parser;
rdfa_setup_initial_context(context);
#endif
context->preread = 1;
return RDFA_PARSE_SUCCESS;
}
/* otherwise just parse the block passed in */
#ifdef LIBRDFA_IN_RAPTOR
if(raptor_sax2_parse_chunk(context->sax2,
(const unsigned char*)data, wblen, done))
{
return RDFA_PARSE_FAILED;
}
#else
if(xmlParseChunk(context->parser, data, wblen, done))
{
return RDFA_PARSE_FAILED;
}
#endif
return RDFA_PARSE_SUCCESS;
}
void rdfa_parse_end(rdfacontext* context)
{
/* free context stack */
rdfa_free_context_stack(context);
/* Free the expat parser and the like */
#ifdef LIBRDFA_IN_RAPTOR
if(context->base_uri)
raptor_free_uri(context->base_uri);
raptor_free_sax2(context->sax2);
context->sax2=NULL;
#else
/* free parser */
xmlFreeParserCtxt(context->parser);
xmlCleanupParser();
#endif
}
char* rdfa_get_buffer(rdfacontext* context, size_t* blen)
{
*blen = context->wb_allocated;
return context->working_buffer;
}
int rdfa_parse_buffer(rdfacontext* context, size_t bytes)
{
int rval;
int done;
done = (bytes == 0);
rval = rdfa_parse_chunk(context, context->working_buffer, bytes, done);
context->done = done;
return rval;
}
int rdfa_parse(rdfacontext* context)
{
int rval;
rval = rdfa_parse_start(context);
if(rval != RDFA_PARSE_SUCCESS)
{
context->done = 1;
return rval;
}
do
{
size_t wblen;
int done;
wblen = context->buffer_filler_callback(
context->working_buffer, context->wb_allocated,
context->callback_data);
done = (wblen == 0);
rval = rdfa_parse_chunk(context, context->working_buffer, wblen, done);
context->done=done;
}
while(!context->done && rval == RDFA_PARSE_SUCCESS);
rdfa_parse_end(context);
return rval;
}
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