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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2010-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* file name: udicttrie.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2010dec17
* created by: Markus W. Scherer
*/
#ifndef __USTRINGTRIE_H__
#define __USTRINGTRIE_H__
/**
* \file
* \brief C API: Helper definitions for dictionary trie APIs.
*/
#include "unicode/utypes.h"
/**
* Return values for BytesTrie::next(), UCharsTrie::next() and similar methods.
* @see USTRINGTRIE_MATCHES
* @see USTRINGTRIE_HAS_VALUE
* @see USTRINGTRIE_HAS_NEXT
* @stable ICU 4.8
*/
enum UStringTrieResult {
/**
* The input unit(s) did not continue a matching string.
* Once current()/next() return USTRINGTRIE_NO_MATCH,
* all further calls to current()/next() will also return USTRINGTRIE_NO_MATCH,
* until the trie is reset to its original state or to a saved state.
* @stable ICU 4.8
*/
USTRINGTRIE_NO_MATCH,
/**
* The input unit(s) continued a matching string
* but there is no value for the string so far.
* (It is a prefix of a longer string.)
* @stable ICU 4.8
*/
USTRINGTRIE_NO_VALUE,
/**
* The input unit(s) continued a matching string
* and there is a value for the string so far.
* This value will be returned by getValue().
* No further input byte/unit can continue a matching string.
* @stable ICU 4.8
*/
USTRINGTRIE_FINAL_VALUE,
/**
* The input unit(s) continued a matching string
* and there is a value for the string so far.
* This value will be returned by getValue().
* Another input byte/unit can continue a matching string.
* @stable ICU 4.8
*/
USTRINGTRIE_INTERMEDIATE_VALUE
};
/**
* Same as (result!=USTRINGTRIE_NO_MATCH).
* @param result A result from BytesTrie::first(), UCharsTrie::next() etc.
* @return true if the input bytes/units so far are part of a matching string/byte sequence.
* @stable ICU 4.8
*/
#define USTRINGTRIE_MATCHES(result) ((result)!=USTRINGTRIE_NO_MATCH)
/**
* Equivalent to (result==USTRINGTRIE_INTERMEDIATE_VALUE || result==USTRINGTRIE_FINAL_VALUE) but
* this macro evaluates result exactly once.
* @param result A result from BytesTrie::first(), UCharsTrie::next() etc.
* @return true if there is a value for the input bytes/units so far.
* @see BytesTrie::getValue
* @see UCharsTrie::getValue
* @stable ICU 4.8
*/
#define USTRINGTRIE_HAS_VALUE(result) ((result)>=USTRINGTRIE_FINAL_VALUE)
/**
* Equivalent to (result==USTRINGTRIE_NO_VALUE || result==USTRINGTRIE_INTERMEDIATE_VALUE) but
* this macro evaluates result exactly once.
* @param result A result from BytesTrie::first(), UCharsTrie::next() etc.
* @return true if another input byte/unit can continue a matching string.
* @stable ICU 4.8
*/
#define USTRINGTRIE_HAS_NEXT(result) ((result)&1)
#endif /* __USTRINGTRIE_H__ */
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