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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__ */