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audacity/lib-src/libraptor/src/ntriples_parse.c
ra 58caf78a86 Move library tree where it belongs
2010-01-24 09:19:39 +00:00

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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* ntriples_parse.c - Raptor N-Triples Parser implementation
*
* N-Triples
* http://www.w3.org/TR/rdf-testcases/#ntriples
*
* Copyright (C) 2001-2006, David Beckett http://purl.org/net/dajobe/
* Copyright (C) 2001-2005, 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
#ifdef WIN32
#include <win32_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 "raptor.h"
#include "raptor_internal.h"
/* Set RAPTOR_DEBUG to > 1 to get lots of buffer related debugging */
/*
#undef RAPTOR_DEBUG
#define RAPTOR_DEBUG 2
*/
/* Prototypes for local functions */
static void raptor_ntriples_generate_statement(raptor_parser* parser, const unsigned char *subject, const raptor_ntriples_term_type subject_type, const unsigned char *predicate, const raptor_ntriples_term_type predicate_type, const void *object, const raptor_ntriples_term_type object_type, const unsigned char *object_literal_language, const unsigned char *object_literal_datatype);
/*
* NTriples parser object
*/
struct raptor_ntriples_parser_context_s {
/* current line */
unsigned char *line;
/* current line length */
int line_length;
/* current char in line buffer */
int offset;
char last_char;
/* static statement for use in passing to user code */
raptor_statement statement;
};
typedef struct raptor_ntriples_parser_context_s raptor_ntriples_parser_context;
/**
* raptor_ntriples_parse_init:
*
* Initialise the Raptor NTriples parser.
*
* Return value: non 0 on failure
**/
static int
raptor_ntriples_parse_init(raptor_parser* rdf_parser, const char *name)
{
/*raptor_ntriples_parser_context *ntriples_parser=(raptor_ntriples_parser_context*)rdf_parser->context; */
return 0;
}
/* PUBLIC FUNCTIONS */
/*
* raptor_ntriples_parse_terminate - Free the Raptor NTriples parser
* @rdf_parser: parser object
*
**/
static void
raptor_ntriples_parse_terminate(raptor_parser* rdf_parser)
{
raptor_ntriples_parser_context *ntriples_parser=(raptor_ntriples_parser_context*)rdf_parser->context;
if(ntriples_parser->line_length)
RAPTOR_FREE(cdata, ntriples_parser->line);
}
static const char * const term_type_strings[]={
"URIref",
"bnodeID",
"Literal"
};
/**
* raptor_ntriples_term_as_string:
* @term: N-Triples term.
*
* @Deprecated: an internal debug function, do not use.
*
* Get a label for a #raptor_ntriples_term_type.
*
* Return value: a pointer to a constant string.
**/
const char *
raptor_ntriples_term_as_string(raptor_ntriples_term_type term)
{
return term_type_strings[(int)term];
}
static void
raptor_ntriples_generate_statement(raptor_parser* parser,
const unsigned char *subject,
const raptor_ntriples_term_type subject_type,
const unsigned char *predicate,
const raptor_ntriples_term_type predicate_type,
const void *object,
const raptor_ntriples_term_type object_type,
const unsigned char *object_literal_language,
const unsigned char *object_literal_datatype)
{
/* raptor_ntriples_parser_context *ntriples_parser=(raptor_ntriples_parser_context*)parser->context; */
raptor_statement *statement=&parser->statement;
raptor_uri *subject_uri=NULL;
raptor_uri *predicate_uri=NULL;
raptor_uri *object_uri=NULL;
raptor_uri *datatype_uri=NULL;
/* Two choices for subject from N-Triples */
if(subject_type == RAPTOR_NTRIPLES_TERM_TYPE_BLANK_NODE) {
statement->subject=subject;
statement->subject_type=RAPTOR_IDENTIFIER_TYPE_ANONYMOUS;
} else {
subject_uri=raptor_new_uri(subject);
statement->subject=subject_uri;
statement->subject_type=RAPTOR_IDENTIFIER_TYPE_RESOURCE;
}
if(object_literal_datatype) {
datatype_uri=raptor_new_uri(object_literal_datatype);
object_literal_language=NULL;
}
/* Predicates in N-Triples are URIs but check for bad ordinals */
if(!strncmp((const char*)predicate, "http://www.w3.org/1999/02/22-rdf-syntax-ns#_", 44)) {
int predicate_ordinal=raptor_check_ordinal(predicate+44);
if(predicate_ordinal <= 0)
raptor_parser_error(parser, "Illegal ordinal value %d in property '%s'.", predicate_ordinal, predicate);
}
predicate_uri=raptor_new_uri(predicate);
statement->predicate_type=RAPTOR_IDENTIFIER_TYPE_RESOURCE;
statement->predicate=predicate_uri;
/* Three choices for object from N-Triples */
statement->object_literal_language=NULL;
statement->object_literal_datatype=NULL;
if(object_type == RAPTOR_NTRIPLES_TERM_TYPE_URI_REF) {
object_uri=raptor_new_uri((const unsigned char*)object);
statement->object=object_uri;
statement->object_type=RAPTOR_IDENTIFIER_TYPE_RESOURCE;
} else if(object_type == RAPTOR_NTRIPLES_TERM_TYPE_BLANK_NODE) {
statement->object=object;
statement->object_type=RAPTOR_IDENTIFIER_TYPE_ANONYMOUS;
} else {
statement->object_type=RAPTOR_IDENTIFIER_TYPE_LITERAL;
statement->object=object;
statement->object_literal_language=object_literal_language;
statement->object_literal_datatype=datatype_uri;
}
if(!parser->statement_handler)
return;
/* Generate the statement; or is it fact? */
(*parser->statement_handler)(parser->user_data, statement);
if(subject_uri)
raptor_free_uri(subject_uri);
if(predicate_uri)
raptor_free_uri(predicate_uri);
if(object_uri)
raptor_free_uri(object_uri);
if(datatype_uri)
raptor_free_uri(datatype_uri);
}
/* These are for 7-bit ASCII and not locale-specific */
#define IS_ASCII_ALPHA(c) (((c)>0x40 && (c)<0x5B) || ((c)>0x60 && (c)<0x7B))
#define IS_ASCII_UPPER(c) ((c)>0x40 && (c)<0x5B)
#define IS_ASCII_DIGIT(c) ((c)>0x2F && (c)<0x3A)
#define IS_ASCII_PRINT(c) ((c)>0x1F && (c)<0x7F)
#define TO_ASCII_LOWER(c) ((c)+0x20)
typedef enum {
RAPTOR_TERM_CLASS_URI, /* ends on > */
RAPTOR_TERM_CLASS_BNODEID, /* ends on first non [A-Za-z][A-Za-z0-9]* */
RAPTOR_TERM_CLASS_STRING, /* ends on non-escaped " */
RAPTOR_TERM_CLASS_LANGUAGE, /* ends on first non [a-z0-9]+ ('-' [a-z0-9]+ )? */
RAPTOR_TERM_CLASS_FULL /* the entire string is used */
} raptor_ntriples_term_class;
static int
raptor_ntriples_term_valid(unsigned char c, int position,
raptor_ntriples_term_class term_class)
{
int result=0;
switch(term_class) {
case RAPTOR_TERM_CLASS_URI:
/* ends on > */
result=(c!= '>');
break;
case RAPTOR_TERM_CLASS_BNODEID:
/* ends on first non [A-Za-z][A-Za-z0-9]* */
result=IS_ASCII_ALPHA(c);
if(position)
result = (result || IS_ASCII_DIGIT(c));
break;
case RAPTOR_TERM_CLASS_STRING:
/* ends on " */
result=(c!= '"');
break;
case RAPTOR_TERM_CLASS_LANGUAGE:
/* ends on first non [a-z0-9]+ ('-' [a-z0-9]+ )? */
result=(IS_ASCII_ALPHA(c) || IS_ASCII_DIGIT(c));
if(position)
result = (result || c=='-');
break;
case RAPTOR_TERM_CLASS_FULL:
result=1;
break;
default:
RAPTOR_FATAL2("Unknown ntriples term %d", term_class);
}
return result;
}
/*
* raptor_ntriples_term - Parse an N-Triples term with escapes
* @parser: NTriples parser
* @start: pointer to starting character of string (in)
* @dest: destination of string (in)
* @lenp: pointer to length of string (in/out)
* @dest_lenp: pointer to length of destination string (out)
* @end_char: string ending character
* @class: string class
* @allow_utf8: Non-0 if UTF-8 chars are allowed in the term
*
* N-Triples strings/URIs are written in ASCII at present; characters
* outside the printable ASCII range are discarded with a warning.
* See the grammar for full details of the allowed ranges.
*
* If the class is RAPTOR_TERM_CLASS_FULL, the end_char is ignored.
*
* UTF-8 is only allowed if allow_utf8 is non-0, otherwise the
* string is US-ASCII and only the \u and \U esapes are allowed.
* If enabled, both are allowed.
*
* Return value: Non 0 on failure
**/
static int
raptor_ntriples_term(raptor_parser* rdf_parser,
const unsigned char **start, unsigned char *dest,
size_t *lenp, size_t *dest_lenp,
char end_char,
raptor_ntriples_term_class term_class,
int allow_utf8)
{
const unsigned char *p=*start;
unsigned char c='\0';
size_t ulen=0;
unsigned long unichar=0;
unsigned int position=0;
int end_char_seen=0;
if(term_class == RAPTOR_TERM_CLASS_FULL)
end_char='\0';
/* find end of string, fixing backslashed characters on the way */
while(*lenp > 0) {
c = *p;
p++;
(*lenp)--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(allow_utf8) {
if(c > 0x7f) {
/* just copy the UTF-8 bytes through */
size_t unichar_len=raptor_utf8_to_unicode_char(NULL, (const unsigned char*)p-1, 1+*lenp);
if(unichar_len > *lenp) {
raptor_parser_error(rdf_parser, "UTF-8 encoding error at character %d (0x%02X) found.", c, c);
/* UTF-8 encoding had an error or ended in the middle of a string */
return 1;
}
memcpy(dest, p-1, unichar_len);
dest+= unichar_len;
unichar_len--; /* p, *lenp were moved on by 1 earlier */
p += unichar_len;
(*lenp) -= unichar_len;
rdf_parser->locator.column+= unichar_len;
rdf_parser->locator.byte+= unichar_len;
continue;
}
} else if(!IS_ASCII_PRINT(c)) {
/* This is an ASCII check, not a printable character check
* so isprint() is not appropriate, since that is a locale check.
*/
raptor_parser_error(rdf_parser, "Non-printable ASCII character %d (0x%02X) found.", c, c);
continue;
}
if(c != '\\') {
/* finish at non-backslashed end_char */
if(end_char && c == end_char) {
end_char_seen=1;
break;
}
if(!raptor_ntriples_term_valid(c, position, term_class)) {
if(end_char) {
/* end char was expected, so finding an invalid thing is an error */
raptor_parser_error(rdf_parser, "Missing terminating '%c' (found '%c')", end_char, c);
return 0;
} else {
/* it's the end - so rewind 1 to save next char */
p--;
(*lenp)++;
rdf_parser->locator.column--;
rdf_parser->locator.byte--;
break;
}
}
/* otherwise store and move on */
*dest++=c;
position++;
continue;
}
if(!*lenp) {
if(term_class != RAPTOR_TERM_CLASS_FULL)
raptor_parser_error(rdf_parser, "\\ at end of line");
return 0;
}
c = *p;
p++;
(*lenp)--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
switch(c) {
case '"':
case '\\':
*dest++=c;
break;
case 'n':
*dest++='\n';
break;
case 'r':
*dest++='\r';
break;
case 't':
*dest++='\t';
break;
case 'u':
case 'U':
ulen=(c == 'u') ? 4 : 8;
if(*lenp < ulen) {
raptor_parser_error(rdf_parser, "%c over end of line", c);
return 0;
}
if(1) {
int n;
n=sscanf((const char*)p, ((ulen == 4) ? "%04lx" : "%08lx"), &unichar);
if(n != 1) {
raptor_parser_error(rdf_parser, "Illegal Uncode escape '%c%s...'", c, p);
break;
}
}
p+=ulen;
(*lenp)-=ulen;
rdf_parser->locator.column+=ulen;
rdf_parser->locator.byte+=ulen;
if(unichar > 0x10ffff) {
raptor_parser_error(rdf_parser, "Illegal Unicode character with code point #x%lX.", unichar);
break;
}
dest+=raptor_unicode_char_to_utf8(unichar, dest);
break;
default:
raptor_parser_error(rdf_parser,
"Illegal string escape \\%c in \"%s\"", c,
(char*)start);
return 0;
}
position++;
} /* end while */
if(end_char && !end_char_seen) {
raptor_parser_error(rdf_parser, "Missing terminating '%c' before end of line.", end_char);
return 1;
}
/* terminate dest, can be shorter than source */
*dest='\0';
if(dest_lenp)
*dest_lenp=p-*start;
*start=p;
return 0;
}
/**
* raptor_ntriples_string_as_utf8_string:
* @rdf_parser: parser object
* @src: data to read from
* @len: size of data
* @dest_lenp: pointer to length of destination (out) or NULL
*
* Turn an N-Triples string with escapes into a UTF-8 string.
*
* @Deprecated: This requires use of parser internals and was never in the public API header.
*
* Return value: a new UTF-8 string
**/
unsigned char*
raptor_ntriples_string_as_utf8_string(raptor_parser* rdf_parser,
const unsigned char *src, int len,
size_t *dest_lenp)
{
const unsigned char *start=src;
size_t length=len;
unsigned char *dest=(unsigned char*)RAPTOR_MALLOC(cstring, len+1);
int rc=raptor_ntriples_term(rdf_parser, &start, dest, &length, dest_lenp,
'\0', RAPTOR_TERM_CLASS_FULL, 1);
if(rc) {
RAPTOR_FREE(cstring, dest);
dest=NULL;
}
return dest;
}
static int
raptor_ntriples_parse_line(raptor_parser* rdf_parser,
unsigned char *buffer, size_t len)
{
int i;
unsigned char *p;
unsigned char *dest;
unsigned char *terms[3];
int terms_allocated[3];
size_t term_lengths[3];
raptor_ntriples_term_type term_types[3];
size_t term_length= 0;
unsigned char *object_literal_language=NULL;
unsigned char *object_literal_datatype=NULL;
int rc=0;
for(i=0; i<3; i++)
terms_allocated[i]=0;
/* ASSERTION:
* p always points to first char we are considering
* p[len-1] always points to last char
*/
/* Handle empty lines */
if(!len)
return 0;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG3("handling line '%s' (%d bytes)\n", buffer, (unsigned int)len);
#endif
p=buffer;
while(len>0 && isspace((int)*p)) {
p++;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
len--;
}
/* Handle empty - all whitespace lines */
if(!len)
return 0;
/* Handle comment lines */
if(*p == '#')
return 0;
/* Remove trailing spaces */
while(len>0 && isspace((int)p[len-1])) {
p[len-1]='\0';
len--;
}
/* can't be empty now - that would have been caught above */
/* Check for terminating '.' */
if(p[len-1] != '.') {
/* Move current location to point to problem */
rdf_parser->locator.column += len-2;
rdf_parser->locator.byte += len-2;
raptor_parser_error(rdf_parser, "Missing . at end of line");
return 0;
}
p[len-1]='\0';
len--;
/* Must be triple */
for(i=0; i<3; i++) {
if(!len) {
raptor_parser_error(rdf_parser, "Unexpected end of line");
goto cleanup;
}
/* Expect either <URI> or _:name */
if(i == 2) {
if(*p != '<' && *p != '_' && *p != '"' && *p != 'x') {
raptor_parser_error(rdf_parser, "Saw '%c', expected <URIref>, _:bnodeID or \"literal\"", *p);
goto cleanup;
}
if(*p == 'x') {
if(len < 4 || strncmp((const char*)p, "xml\"", 4)) {
raptor_parser_error(rdf_parser, "Saw '%c', expected xml\"...\")", *p);
goto cleanup;
}
}
} else if(i == 1) {
if(*p != '<') {
raptor_parser_error(rdf_parser, "Saw '%c', expected <URIref>", *p);
goto cleanup;
}
} else /* i==0 */ {
if(*p != '<' && *p != '_') {
raptor_parser_error(rdf_parser, "Saw '%c', expected <URIref> or _:bnodeID", *p);
goto cleanup;
}
}
switch(*p) {
case '<':
term_types[i]= RAPTOR_NTRIPLES_TERM_TYPE_URI_REF;
dest=p;
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
dest, &len, &term_length,
'>', RAPTOR_TERM_CLASS_URI, 0)) {
rc=1;
goto cleanup;
}
break;
case '"':
term_types[i]= RAPTOR_NTRIPLES_TERM_TYPE_LITERAL;
dest=p;
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
dest, &len, &term_length,
'"', RAPTOR_TERM_CLASS_STRING, 0)) {
rc=1;
goto cleanup;
}
if(len && (*p == '-' || *p == '@')) {
if(*p == '-')
raptor_parser_error(rdf_parser, "Old N-Triples language syntax using \"string\"-lang rather than \"string\"@lang.");
object_literal_language=p;
/* Skip - */
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(!len) {
raptor_parser_error(rdf_parser, "Missing language after \"string\"-");
goto cleanup;
}
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
object_literal_language, &len, NULL,
'\0', RAPTOR_TERM_CLASS_LANGUAGE, 0)) {
rc=1;
goto cleanup;
}
}
if(len >1 && *p == '^' && p[1] == '^') {
object_literal_datatype=p;
/* Skip ^^ */
p+= 2;
len-= 2;
rdf_parser->locator.column+= 2;
rdf_parser->locator.byte+= 2;
if(!len || (len && *p != '<')) {
raptor_parser_error(rdf_parser, "Missing datatype URI-ref in\"string\"^^<URI-ref> after ^^");
goto cleanup;
}
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
object_literal_datatype, &len, NULL,
'>', RAPTOR_TERM_CLASS_URI, 0)) {
rc=1;
goto cleanup;
}
}
if(object_literal_datatype && object_literal_language) {
raptor_parser_warning(rdf_parser, "Typed literal used with a language - ignoring the language");
object_literal_language=NULL;
}
break;
case '_':
term_types[i]= RAPTOR_NTRIPLES_TERM_TYPE_BLANK_NODE;
/* store where _ was */
dest=p;
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(!len || (len > 0 && *p != ':')) {
raptor_parser_error(rdf_parser, "Illegal bNodeID - _ not followed by :");
goto cleanup;
}
/* Found ':' - move on */
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
dest, &len, &term_length,
'\0', RAPTOR_TERM_CLASS_BNODEID, 0)) {
rc=1;
goto cleanup;
}
if(!term_length) {
raptor_parser_error(rdf_parser, "Bad or missing bNodeID after _:");
goto cleanup;
} else {
unsigned char *blank=(unsigned char*)RAPTOR_MALLOC(cstring, term_length+1);
if(!blank) {
raptor_parser_fatal_error(rdf_parser, "Out of memory");
rc=1;
goto cleanup;
}
strcpy((char*)blank, (const char*)dest);
dest=raptor_parser_internal_generate_id(rdf_parser,
RAPTOR_GENID_TYPE_BNODEID,
blank);
terms_allocated[i]=1;
}
break;
case 'x':
raptor_parser_error(rdf_parser, "Old N-Triples XML using xml\"string\"-lang rather than \"string\"@lang^^<%s>.", raptor_xml_literal_datatype_uri_string);
/* already know we have 'xml"' coming up */
term_types[i]= RAPTOR_NTRIPLES_TERM_TYPE_LITERAL;
/* 3=strlen("xml") */
p+=3;
len-=3;
dest=p;
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
dest, &len, &term_length,
'"', RAPTOR_TERM_CLASS_STRING, 0)) {
rc=1;
goto cleanup;
}
/* got XML literal string */
object_literal_datatype=(unsigned char*)raptor_xml_literal_datatype_uri_string;
if(len && (*p == '-' || *p == '@')) {
if(*p == '-')
raptor_parser_error(rdf_parser, "Old N-Triples language syntax using xml\"string\"-lang rather than xml\"string\"@lang.");
object_literal_language=p;
/* Skip - */
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(!len) {
raptor_parser_error(rdf_parser, "Missing language in xml\"string\"-language after -");
goto cleanup;
}
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
object_literal_language, &len, NULL,
'"', RAPTOR_TERM_CLASS_STRING, 0)) {
rc=1;
goto cleanup;
}
}
if(len >1 && *p == '^' && p[1] == '^') {
object_literal_datatype=p;
/* Skip ^^ */
p+= 2;
len-= 2;
rdf_parser->locator.column+= 2;
rdf_parser->locator.byte+= 2;
if(!len || (len && *p != '<')) {
raptor_parser_error(rdf_parser, "Missing datatype URI-ref in xml\"string\"^^<URI-ref> after ^^");
goto cleanup;
}
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
if(raptor_ntriples_term(rdf_parser,
(const unsigned char**)&p,
object_literal_datatype, &len, NULL,
'>', RAPTOR_TERM_CLASS_URI, 0)) {
rc=1;
goto cleanup;
}
}
if(len) {
if(*p != ' ') {
raptor_parser_error(rdf_parser, "Missing terminating ' '");
return 0;
}
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
}
break;
default:
raptor_parser_fatal_error(rdf_parser, "Unknown term type");
rc=1;
goto cleanup;
}
/* Store term */
terms[i]=dest; term_lengths[i]=term_length;
/* Whitespace must separate the terms */
if(i<2 && !isspace((int)*p)) {
raptor_parser_error(rdf_parser, "Missing whitespace after term '%s'", terms[i]);
rc=1;
goto cleanup;
}
/* Skip whitespace after terms */
while(len>0 && isspace((int)*p)) {
p++;
len--;
rdf_parser->locator.column++;
rdf_parser->locator.byte++;
}
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
fprintf(stderr, "item %d: term '%s' len %d type %s\n",
i, terms[i], (unsigned int)term_lengths[i],
raptor_ntriples_term_as_string(term_types[i]));
#endif
}
if(len) {
raptor_parser_error(rdf_parser, "Junk before terminating \".\"");
return 0;
}
if(object_literal_language) {
unsigned char *q;
/* Normalize language to lowercase
* http://www.w3.org/TR/rdf-concepts/#dfn-language-identifier
*/
for(q=object_literal_language; *q; q++) {
if(IS_ASCII_UPPER(*q))
*q=TO_ASCII_LOWER(*q);
}
}
raptor_ntriples_generate_statement(rdf_parser,
terms[0], term_types[0],
terms[1], term_types[1],
terms[2], term_types[2],
object_literal_language,
object_literal_datatype);
rdf_parser->locator.byte += len;
cleanup:
for(i=0; i<3; i++)
if(terms_allocated[i])
RAPTOR_FREE(cstring, terms[i]);
return rc;
}
static int
raptor_ntriples_parse_chunk(raptor_parser* rdf_parser,
const unsigned char *s, size_t len,
int is_end)
{
unsigned char *buffer;
unsigned char *ptr;
unsigned char *start;
raptor_ntriples_parser_context *ntriples_parser=(raptor_ntriples_parser_context*)rdf_parser->context;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG2("adding %d bytes to buffer\n", (unsigned int)len);
#endif
/* No data? It's the end */
if(!len)
return 0;
buffer=(unsigned char*)RAPTOR_MALLOC(cstring, ntriples_parser->line_length + len + 1);
if(!buffer) {
raptor_parser_fatal_error(rdf_parser, "Out of memory");
return 1;
}
if(ntriples_parser->line_length) {
strncpy((char*)buffer, (const char*)ntriples_parser->line, ntriples_parser->line_length);
RAPTOR_FREE(cstring, ntriples_parser->line);
}
ntriples_parser->line=buffer;
/* move pointer to end of cdata buffer */
ptr=buffer+ntriples_parser->line_length;
/* adjust stored length */
ntriples_parser->line_length += len;
/* now write new stuff at end of cdata buffer */
strncpy((char*)ptr, (const char*)s, len);
ptr += len;
*ptr = '\0';
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG2("buffer now %d bytes\n", ntriples_parser->line_length);
#endif
ptr=buffer+ntriples_parser->offset;
while(*(start=ptr)) {
unsigned char *line_start=ptr;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG3("line buffer now '%s' (offset %d)\n", ptr, ptr-(buffer+ntriples_parser->offset));
#endif
/* skip \n when just seen \r - i.e. \r\n or CR LF */
if(ntriples_parser->last_char == '\r' && *ptr == '\n') {
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG1("skipping a \\n\n");
#endif
ptr++;
rdf_parser->locator.byte++;
rdf_parser->locator.column=0;
start=line_start=ptr;
}
while(*ptr && *ptr != '\n' && *ptr != '\r')
ptr++;
if(!*ptr)
break;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG3("found newline \\x%02x at offset %d\n", *ptr,
ptr-line_start);
#endif
ntriples_parser->last_char=*ptr;
len=ptr-line_start;
rdf_parser->locator.column=0;
*ptr='\0';
if(raptor_ntriples_parse_line(rdf_parser,line_start,len))
return 1;
rdf_parser->locator.line++;
/* go past newline */
ptr++;
rdf_parser->locator.byte++;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
/* Do not peek if too far */
if(ptr-buffer < ntriples_parser->line_length)
RAPTOR_DEBUG2("next char is \\x%02x\n", *ptr);
else
RAPTOR_DEBUG1("next char unknown - end of buffer\n");
#endif
}
ntriples_parser->offset=start-buffer;
len=ntriples_parser->line_length - ntriples_parser->offset;
if(len) {
/* collapse buffer */
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG3("collapsing buffer from %d to %d bytes\n", ntriples_parser->line_length, (unsigned int)len);
#endif
buffer=(unsigned char*)RAPTOR_MALLOC(cstring, len + 1);
if(!buffer) {
raptor_parser_fatal_error(rdf_parser, "Out of memory");
return 1;
}
strncpy((char*)buffer,
(const char*)ntriples_parser->line+ntriples_parser->line_length-len,
len);
buffer[len]='\0';
RAPTOR_FREE(cstring, ntriples_parser->line);
ntriples_parser->line=buffer;
ntriples_parser->line_length -= ntriples_parser->offset;
ntriples_parser->offset=0;
#if defined(RAPTOR_DEBUG) && RAPTOR_DEBUG > 1
RAPTOR_DEBUG3("buffer now '%s' (%d bytes)\n", ntriples_parser->line, ntriples_parser->line_length);
#endif
}
/* exit now, no more input */
if(is_end) {
if(ntriples_parser->offset != ntriples_parser->line_length) {
raptor_parser_error(rdf_parser, "Junk at end of input.\"");
return 1;
}
return 0;
}
return 0;
}
static int
raptor_ntriples_parse_start(raptor_parser* rdf_parser)
{
raptor_locator *locator=&rdf_parser->locator;
raptor_ntriples_parser_context *ntriples_parser=(raptor_ntriples_parser_context*)rdf_parser->context;
locator->line=1;
locator->column=0;
locator->byte=0;
ntriples_parser->last_char='\0';
return 0;
}
static int
raptor_ntriples_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(suffix) {
if(!strcmp((const char*)suffix, "nt"))
score=8;
if(!strcmp((const char*)suffix, "ttl"))
score=3;
if(!strcmp((const char*)suffix, "n3"))
score=1;
}
if(mime_type) {
if(strstr((const char*)mime_type, "ntriples"))
score+=6;
}
return score;
}
static int
raptor_ntriples_parser_register_factory(raptor_parser_factory *factory)
{
int rc=0;
factory->context_length = sizeof(raptor_ntriples_parser_context);
factory->need_base_uri = 0;
factory->init = raptor_ntriples_parse_init;
factory->terminate = raptor_ntriples_parse_terminate;
factory->start = raptor_ntriples_parse_start;
factory->chunk = raptor_ntriples_parse_chunk;
factory->recognise_syntax = raptor_ntriples_parse_recognise_syntax;
rc=raptor_parser_factory_add_uri(factory,
(const unsigned char*)"http://www.w3.org/TR/rdf-testcases/#ntriples");
return rc;
}
int
raptor_init_parser_ntriples(void)
{
return !raptor_parser_register_factory("ntriples", "N-Triples",
&raptor_ntriples_parser_register_factory);
}
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