/* -*- Mode: c; c-basic-offset: 2 -*-
 *
 * raptor_feature.c - Parser and Serializer features
 *
 * $Id: raptor_feature.c,v 1.7 2005/02/01 22:00:36 cmdjb Exp $
 *
 * Copyright (C) 2004-2005, David Beckett http://purl.org/net/dajobe/
 * Institute for Learning and Research Technology http://www.ilrt.bristol.ac.uk/
 * 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>
#else
#ifdef WIN32
#include <win32_raptor_config.h>
#endif
#endif


#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>

/* Raptor includes */
#include "raptor.h"
#include "raptor_internal.h"


static struct
{
  raptor_feature feature;
  /* flag bits
   *  1=parserfeature
   *  2=serializer feature
   *  4=string value (else int)
   *  8=xml writer feature
   */
  int flags;
  const char *name;
  const char *label;
} raptor_features_list [RAPTOR_FEATURE_LAST+1]= {
  { RAPTOR_FEATURE_SCANNING                , 1, "scanForRDF", "Scan for rdf:RDF in XML content" },
  { RAPTOR_FEATURE_ASSUME_IS_RDF           , 1, "assumeIsRDF", "Assume content is RDF/XML, don't require rdf:RDF" },
  { RAPTOR_FEATURE_ALLOW_NON_NS_ATTRIBUTES , 1, "allowNonNsAttributes", "Allow bare 'name' rather than namespaced 'rdf:name'" },
  { RAPTOR_FEATURE_ALLOW_OTHER_PARSETYPES  , 1, "allowOtherParsetypes", "Allow user-defined rdf:parseType values" },
  { RAPTOR_FEATURE_ALLOW_BAGID             , 1, "allowBagID", "Allow rdf:bagID" },
  { RAPTOR_FEATURE_ALLOW_RDF_TYPE_RDF_LIST , 1, "allowRDFtypeRDFlist", "Generate the collection rdf:type rdf:List triple" },
  { RAPTOR_FEATURE_NORMALIZE_LANGUAGE      , 1, "normalizeLanguage", "Normalize xml:lang values to lowercase" },
  { RAPTOR_FEATURE_NON_NFC_FATAL           , 1, "nonNFCfatal", "Make non-NFC literals cause a fatal error" },
  { RAPTOR_FEATURE_WARN_OTHER_PARSETYPES   , 1, "warnOtherParseTypes", "Warn about unknown rdf:parseType values" },
  { RAPTOR_FEATURE_CHECK_RDF_ID            , 1, "checkRdfID", "Check rdf:ID values for duplicates" },
  { RAPTOR_FEATURE_RELATIVE_URIS           , 2, "relativeURIs", "Write relative URIs wherever possible in serializing." },
  { RAPTOR_FEATURE_START_URI               , 6, "startURI", "Start URI for serializing to use." },
  { RAPTOR_FEATURE_WRITER_AUTO_INDENT      , 8, "autoIndent", "Automatically indent elements." },
  { RAPTOR_FEATURE_WRITER_AUTO_EMPTY       , 8, "autoEmpty", "Automatically detect and abbreviate empty elements." },
  { RAPTOR_FEATURE_WRITER_INDENT_WIDTH     , 8, "indentWidth", "Number of spaces to indent." }
};


static const char *raptor_feature_uri_prefix="http://feature.librdf.org/raptor-";
/* NOTE: this is strlen(raptor_feature_uri_prefix) */
#define RAPTOR_FEATURE_URI_PREFIX_LEN 33


/*
 * raptor_features_enumerate_common - Get list of syntax features INTERNAL
 * @counter: feature enumeration (0+)
 * @name: pointer to store feature short name (or NULL)
 * @uri: pointer to store feature URI (or NULL)
 * @label: pointer to feature label (or NULL)
 * @flags: flags to match
 * 
 * If uri is not NULL, a pointer toa new raptor_uri is returned
 * that must be freed by the caller with raptor_free_uri().
 *
 * Return value: 0 on success, <0 on failure, >0 if feature is unknown
 **/
int
raptor_features_enumerate_common(const raptor_feature feature,
                                 const char **name, 
                                 raptor_uri **uri, const char **label,
                                 int flags)
{
  int i;

  for(i=0; i <= RAPTOR_FEATURE_LAST; i++)
    if(raptor_features_list[i].feature == feature &&
       (raptor_features_list[i].flags & flags)) {
      if(name)
        *name=raptor_features_list[i].name;
      
      if(uri) {
        raptor_uri *base_uri=raptor_new_uri((const unsigned char*)raptor_feature_uri_prefix);
        if(!base_uri)
          return -1;
        
        *uri=raptor_new_uri_from_uri_local_name(base_uri,
                                                (const unsigned char*)raptor_features_list[i].name);
        raptor_free_uri(base_uri);
      }
      if(label)
        *label=raptor_features_list[i].label;
      return 0;
    }

  return 1;
}



/*
 * raptor_feature_value_type - Get the type of a features
 * @feature: raptor serializer or parser feature
 *
 * The type of the feature is 0=integer , 1=string.  Other values are
 * undefined.  Most features are integer values and use
 * raptor_set_feature and raptor_get_feature 
 * ( raptor_serializer_set_feature raptor_serializer_get_feature)
 *
 * String value features use raptor_parser_set_feature_string and
 * raptor_parser_get_feature_string ( raptor_serializer_set_feature_string
 * and raptor_serializer_get_feature_string )
 *
 * Return value: the type of the feature or <0 if feature is unknown
 */
int
raptor_feature_value_type(const raptor_feature feature) {
  if (feature  < 0 || feature > RAPTOR_FEATURE_LAST)
    return -1;
  return (raptor_features_list[feature].flags & 4) ? 1 : 0;
}


/**
 * raptor_feature_from_uri - Turn a feature URI into an feature enum
 * @uri: feature URI
 * @flags: flags to match
 * 
 * The allowed feature URIs are available via raptor_features_enumerate().
 *
 * Return value: < 0 if the feature is unknown
 **/
raptor_feature
raptor_feature_from_uri(raptor_uri *uri)
{
  unsigned char *uri_string;
  int i;
  raptor_feature feature= (raptor_feature)-1;
  
  if(!uri)
    return feature;
  
  uri_string=raptor_uri_as_string(uri);
  if(strncmp((const char*)uri_string, raptor_feature_uri_prefix,
             RAPTOR_FEATURE_URI_PREFIX_LEN))
    return feature;

  uri_string += RAPTOR_FEATURE_URI_PREFIX_LEN;

  for(i=0; i <= RAPTOR_FEATURE_LAST; i++)
    if(!strcmp(raptor_features_list[i].name, (const char*)uri_string)) {
      feature=(raptor_feature)i;
      break;
    }

  return feature;
}
