/* This file is part of the YAZ toolkit.
 * Copyright (C) 1995-2012 Index Data.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Index Data nor the names of its contributors
 *       may be used to endorse or promote products derived from this
 *       software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** \file
    \brief ICU utilities
*/


#ifndef YAZ_ICU_H
#define YAZ_ICU_H

#include <yaz/yconfig.h>

#include <yaz/xmltypes.h>

#include <unicode/utypes.h>

YAZ_BEGIN_CDECL

/** \brief opaque ICU chain */
typedef struct icu_chain *yaz_icu_chain_t;

/** \brief destroys ICU chain */
YAZ_EXPORT void icu_chain_destroy(yaz_icu_chain_t chain);

/** \brief constructs ICU chain from XML specification
    \param xml_node icu_chain XML node - with attribute locale in it
    \param sort 1 if ICU chain is to deal with sort keys; 0 otherwise
    \param status May include ICU error code on failure
    \returns chain ptr or NULL on failure in which case status may hold info
*/
YAZ_EXPORT yaz_icu_chain_t icu_chain_xml_config(const xmlNode *xml_node,
                                                int sort,
                                                UErrorCode * status);
/** \brief pass string to ICU for parsing/tokenization/etc
    \param chain ICU chain to be used for parsing
    \param src8cstr input C string (null-terminated)
    \param status may include ICU error on failure
    \retval 0 failure
    \retval 1 success
*/
YAZ_EXPORT int icu_chain_assign_cstr(yaz_icu_chain_t chain,
                                     const char * src8cstr, 
                                     UErrorCode *status);

/** \brief returns one token (if any)
    \param chain ICU chain
    \param status may include ICU error on failure
    \retval 0 error or end-of-tokens (no more tokens)
    \retval >0 token number (1, 3, 3, ..)

    This function tries to move to "next" token in assigned
    C-string .. Or returns 0 if no more is to be found
*/
YAZ_EXPORT int icu_chain_next_token(yaz_icu_chain_t chain,
                                    UErrorCode *status);

/** \brief returns token number of last token processed
    \brief chain ICU chain
    \returns token number (numbered from 1)
*/
YAZ_EXPORT int icu_chain_token_number(yaz_icu_chain_t chain);

/** \brief returns display token of last token processed
    \param chain ICU chain
    \returns display token string (C string)
    This function returns display string for last token returned
    by icu_chain_next_token.
*/
YAZ_EXPORT const char * icu_chain_token_display(yaz_icu_chain_t chain);

/** \brief returns normalized token of last token processed
    \param chain ICU chain
    \returns normalized token string (C string)
    This function returns normalized string for last token returned
    by icu_chain_next_token.
*/
YAZ_EXPORT const char * icu_chain_token_norm(yaz_icu_chain_t chain);

/** \brief returns sortkey token of last token processed
    \param chain ICU chain
    \returns sortkey token string (C string)
    This function returns sortkey string for last token returned
    by icu_chain_next_token.
*/
YAZ_EXPORT const char * icu_chain_token_sortkey(yaz_icu_chain_t chain);

/** \brief ICU tokenizer iterator type (opaque) */
typedef struct icu_iter *yaz_icu_iter_t;

/** \brief create ICU tokenizer iterator from chain
    \param chain ICU chain
    \returns ICU iterator
*/
YAZ_EXPORT
yaz_icu_iter_t icu_iter_create(struct icu_chain *chain);

/** \brief starts iteration over string
    \param iter ICU tokenizer iterator
    \param src8cstr input string (0-terminated)
    
    Call icu_iter_next to iterate over each token.
*/
YAZ_EXPORT
void icu_iter_first(yaz_icu_iter_t iter, const char *src8cstr);

/** \brief iterates over one token
    \param iter ICU tokenizer iterator
    \retval 0 no more tokens (EOF)
    \retval 1 got one token (use icu_iter_get..-functions)
*/
YAZ_EXPORT
int icu_iter_next(yaz_icu_iter_t iter);

/** \brief destroy ICU tokenizer iterator
    \param iter ICU tokenizer iterator
*/
YAZ_EXPORT
void icu_iter_destroy(yaz_icu_iter_t iter);

/** \brief returns ICU normalized token
    \param iter ICU tokenizer iterator
    \returns string (0-terminated)
*/
YAZ_EXPORT
const char *icu_iter_get_norm(yaz_icu_iter_t iter);

/** \brief returns ICU sortkey string
    \param iter ICU tokenizer iterator
    \returns string (0-terminated)
*/
YAZ_EXPORT
const char *icu_iter_get_sortkey(yaz_icu_iter_t iter);

/** \brief returns ICU display string
    \param iter ICU tokenizer iterator
    \returns string (0-terminated)
*/
YAZ_EXPORT
const char *icu_iter_get_display(yaz_icu_iter_t iter);

/** \brief returns ICU token count for iterator
    \param iter ICU tokenizer iterator
    \returns token count (1, 2, 3...)
*/
YAZ_EXPORT
int icu_iter_get_token_number(yaz_icu_iter_t iter);

YAZ_END_CDECL

#endif /* YAZ_ICU_H */

/*
 * Local variables:
 * c-basic-offset: 4
 * c-file-style: "Stroustrup"
 * indent-tabs-mode: nil
 * End:
 * vim: shiftwidth=4 tabstop=8 expandtab
 */

