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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-******************************************************************************
-* Copyright (C) 1996-2015, International Business Machines Corporation and others.
-* All Rights Reserved.
-******************************************************************************
-*/
-
-#ifndef UBRK_H
-#define UBRK_H
-
-#include "unicode/utypes.h"
-#include "unicode/uloc.h"
-#include "unicode/utext.h"
-#include "unicode/localpointer.h"
-
-/**
- * A text-break iterator.
- * For usage in C programs.
- */
-#ifndef UBRK_TYPEDEF_UBREAK_ITERATOR
-# define UBRK_TYPEDEF_UBREAK_ITERATOR
- /**
- * Opaque type representing an ICU Break iterator object.
- * @stable ICU 2.0
- */
- typedef struct UBreakIterator UBreakIterator;
-#endif
-
-#if !UCONFIG_NO_BREAK_ITERATION
-
-#include "unicode/parseerr.h"
-
-/**
- * \file
- * \brief C API: BreakIterator
- *
- * <h2> BreakIterator C API </h2>
- *
- * The BreakIterator C API defines methods for finding the location
- * of boundaries in text. Pointer to a UBreakIterator maintain a
- * current position and scan over text returning the index of characters
- * where boundaries occur.
- * <p>
- * Line boundary analysis determines where a text string can be broken
- * when line-wrapping. The mechanism correctly handles punctuation and
- * hyphenated words.
- * <p>
- * Note: The locale keyword "lb" can be used to modify line break
- * behavior according to the CSS level 3 line-break options, see
- * <http://dev.w3.org/csswg/css-text/#line-breaking>. For example:
- * "ja@lb=strict", "zh@lb=loose".
- * <p>
- * Sentence boundary analysis allows selection with correct
- * interpretation of periods within numbers and abbreviations, and
- * trailing punctuation marks such as quotation marks and parentheses.
- * <p>
- * Note: The locale keyword "ss" can be used to enable use of
- * segmentation suppression data (preventing breaks in English after
- * abbreviations such as "Mr." or "Est.", for example), as follows:
- * "en@ss=standard".
- * <p>
- * Word boundary analysis is used by search and replace functions, as
- * well as within text editing applications that allow the user to
- * select words with a double click. Word selection provides correct
- * interpretation of punctuation marks within and following
- * words. Characters that are not part of a word, such as symbols or
- * punctuation marks, have word-breaks on both sides.
- * <p>
- * Character boundary analysis identifies the boundaries of
- * "Extended Grapheme Clusters", which are groupings of codepoints
- * that should be treated as character-like units for many text operations.
- * Please see Unicode Standard Annex #29, Unicode Text Segmentation,
- * http://www.unicode.org/reports/tr29/ for additional information
- * on grapheme clusters and guidelines on their use.
- * <p>
- * Title boundary analysis locates all positions,
- * typically starts of words, that should be set to Title Case
- * when title casing the text.
- * <p>
- * The text boundary positions are found according to the rules
- * described in Unicode Standard Annex #29, Text Boundaries, and
- * Unicode Standard Annex #14, Line Breaking Properties. These
- * are available at http://www.unicode.org/reports/tr14/ and
- * http://www.unicode.org/reports/tr29/.
- * <p>
- * In addition to the plain C API defined in this header file, an
- * object oriented C++ API with equivalent functionality is defined in the
- * file brkiter.h.
- * <p>
- * Code snippets illustrating the use of the Break Iterator APIs
- * are available in the ICU User Guide,
- * http://icu-project.org/userguide/boundaryAnalysis.html
- * and in the sample program icu/source/samples/break/break.cpp
- */
-
-/** The possible types of text boundaries. @stable ICU 2.0 */
-typedef enum UBreakIteratorType {
- /** Character breaks @stable ICU 2.0 */
- UBRK_CHARACTER = 0,
- /** Word breaks @stable ICU 2.0 */
- UBRK_WORD = 1,
- /** Line breaks @stable ICU 2.0 */
- UBRK_LINE = 2,
- /** Sentence breaks @stable ICU 2.0 */
- UBRK_SENTENCE = 3,
-
-#ifndef U_HIDE_DEPRECATED_API
- /**
- * Title Case breaks
- * The iterator created using this type locates title boundaries as described for
- * Unicode 3.2 only. For Unicode 4.0 and above title boundary iteration,
- * please use Word Boundary iterator.
- *
- * @deprecated ICU 2.8 Use the word break iterator for titlecasing for Unicode 4 and later.
- */
- UBRK_TITLE = 4,
- /**
- * One more than the highest normal UBreakIteratorType value.
- * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
- */
- UBRK_COUNT = 5
-#endif // U_HIDE_DEPRECATED_API
-} UBreakIteratorType;
-
-/** Value indicating all text boundaries have been returned.
- * @stable ICU 2.0
- */
-#define UBRK_DONE ((int32_t) -1)
-
-
-/**
- * Enum constants for the word break tags returned by
- * getRuleStatus(). A range of values is defined for each category of
- * word, to allow for further subdivisions of a category in future releases.
- * Applications should check for tag values falling within the range, rather
- * than for single individual values.
- *
- * The numeric values of all of these constants are stable (will not change).
- *
- * @stable ICU 2.2
-*/
-typedef enum UWordBreak {
- /** Tag value for "words" that do not fit into any of other categories.
- * Includes spaces and most punctuation. */
- UBRK_WORD_NONE = 0,
- /** Upper bound for tags for uncategorized words. */
- UBRK_WORD_NONE_LIMIT = 100,
- /** Tag value for words that appear to be numbers, lower limit. */
- UBRK_WORD_NUMBER = 100,
- /** Tag value for words that appear to be numbers, upper limit. */
- UBRK_WORD_NUMBER_LIMIT = 200,
- /** Tag value for words that contain letters, excluding
- * hiragana, katakana or ideographic characters, lower limit. */
- UBRK_WORD_LETTER = 200,
- /** Tag value for words containing letters, upper limit */
- UBRK_WORD_LETTER_LIMIT = 300,
- /** Tag value for words containing kana characters, lower limit */
- UBRK_WORD_KANA = 300,
- /** Tag value for words containing kana characters, upper limit */
- UBRK_WORD_KANA_LIMIT = 400,
- /** Tag value for words containing ideographic characters, lower limit */
- UBRK_WORD_IDEO = 400,
- /** Tag value for words containing ideographic characters, upper limit */
- UBRK_WORD_IDEO_LIMIT = 500
-} UWordBreak;
-
-/**
- * Enum constants for the line break tags returned by getRuleStatus().
- * A range of values is defined for each category of
- * word, to allow for further subdivisions of a category in future releases.
- * Applications should check for tag values falling within the range, rather
- * than for single individual values.
- *
- * The numeric values of all of these constants are stable (will not change).
- *
- * @stable ICU 2.8
-*/
-typedef enum ULineBreakTag {
- /** Tag value for soft line breaks, positions at which a line break
- * is acceptable but not required */
- UBRK_LINE_SOFT = 0,
- /** Upper bound for soft line breaks. */
- UBRK_LINE_SOFT_LIMIT = 100,
- /** Tag value for a hard, or mandatory line break */
- UBRK_LINE_HARD = 100,
- /** Upper bound for hard line breaks. */
- UBRK_LINE_HARD_LIMIT = 200
-} ULineBreakTag;
-
-
-
-/**
- * Enum constants for the sentence break tags returned by getRuleStatus().
- * A range of values is defined for each category of
- * sentence, to allow for further subdivisions of a category in future releases.
- * Applications should check for tag values falling within the range, rather
- * than for single individual values.
- *
- * The numeric values of all of these constants are stable (will not change).
- *
- * @stable ICU 2.8
-*/
-typedef enum USentenceBreakTag {
- /** Tag value for for sentences ending with a sentence terminator
- * ('.', '?', '!', etc.) character, possibly followed by a
- * hard separator (CR, LF, PS, etc.)
- */
- UBRK_SENTENCE_TERM = 0,
- /** Upper bound for tags for sentences ended by sentence terminators. */
- UBRK_SENTENCE_TERM_LIMIT = 100,
- /** Tag value for for sentences that do not contain an ending
- * sentence terminator ('.', '?', '!', etc.) character, but
- * are ended only by a hard separator (CR, LF, PS, etc.) or end of input.
- */
- UBRK_SENTENCE_SEP = 100,
- /** Upper bound for tags for sentences ended by a separator. */
- UBRK_SENTENCE_SEP_LIMIT = 200
- /** Tag value for a hard, or mandatory line break */
-} USentenceBreakTag;
-
-
-/**
- * Open a new UBreakIterator for locating text boundaries for a specified locale.
- * A UBreakIterator may be used for detecting character, line, word,
- * and sentence breaks in text.
- * @param type The type of UBreakIterator to open: one of UBRK_CHARACTER, UBRK_WORD,
- * UBRK_LINE, UBRK_SENTENCE
- * @param locale The locale specifying the text-breaking conventions. Note that
- * locale keys such as "lb" and "ss" may be used to modify text break behavior,
- * see general discussion of BreakIterator C API.
- * @param text The text to be iterated over. May be null, in which case ubrk_setText() is
- * used to specify the text to be iterated.
- * @param textLength The number of characters in text, or -1 if null-terminated.
- * @param status A UErrorCode to receive any errors.
- * @return A UBreakIterator for the specified locale.
- * @see ubrk_openRules
- * @stable ICU 2.0
- */
-U_STABLE UBreakIterator* U_EXPORT2
-ubrk_open(UBreakIteratorType type,
- const char *locale,
- const UChar *text,
- int32_t textLength,
- UErrorCode *status);
-
-/**
- * Open a new UBreakIterator for locating text boundaries using specified breaking rules.
- * The rule syntax is ... (TBD)
- * @param rules A set of rules specifying the text breaking conventions.
- * @param rulesLength The number of characters in rules, or -1 if null-terminated.
- * @param text The text to be iterated over. May be null, in which case ubrk_setText() is
- * used to specify the text to be iterated.
- * @param textLength The number of characters in text, or -1 if null-terminated.
- * @param parseErr Receives position and context information for any syntax errors
- * detected while parsing the rules.
- * @param status A UErrorCode to receive any errors.
- * @return A UBreakIterator for the specified rules.
- * @see ubrk_open
- * @stable ICU 2.2
- */
-U_STABLE UBreakIterator* U_EXPORT2
-ubrk_openRules(const UChar *rules,
- int32_t rulesLength,
- const UChar *text,
- int32_t textLength,
- UParseError *parseErr,
- UErrorCode *status);
-
-/**
- * Open a new UBreakIterator for locating text boundaries using precompiled binary rules.
- * Opening a UBreakIterator this way is substantially faster than using ubrk_openRules.
- * Binary rules may be obtained using ubrk_getBinaryRules. The compiled rules are not
- * compatible across different major versions of ICU, nor across platforms of different
- * endianness or different base character set family (ASCII vs EBCDIC).
- * @param binaryRules A set of compiled binary rules specifying the text breaking
- * conventions. Ownership of the storage containing the compiled
- * rules remains with the caller of this function. The compiled
- * rules must not be modified or deleted during the life of the
- * break iterator.
- * @param rulesLength The length of binaryRules in bytes; must be >= 0.
- * @param text The text to be iterated over. May be null, in which case
- * ubrk_setText() is used to specify the text to be iterated.
- * @param textLength The number of characters in text, or -1 if null-terminated.
- * @param status Pointer to UErrorCode to receive any errors.
- * @return UBreakIterator for the specified rules.
- * @see ubrk_getBinaryRules
- * @stable ICU 59
- */
-U_STABLE UBreakIterator* U_EXPORT2
-ubrk_openBinaryRules(const uint8_t *binaryRules, int32_t rulesLength,
- const UChar * text, int32_t textLength,
- UErrorCode * status);
-
-/**
- * Thread safe cloning operation
- * @param bi iterator to be cloned
- * @param stackBuffer <em>Deprecated functionality as of ICU 52, use NULL.</em><br>
- * user allocated space for the new clone. If NULL new memory will be allocated.
- * If buffer is not large enough, new memory will be allocated.
- * Clients can use the U_BRK_SAFECLONE_BUFFERSIZE.
- * @param pBufferSize <em>Deprecated functionality as of ICU 52, use NULL or 1.</em><br>
- * pointer to size of allocated space.
- * If *pBufferSize == 0, a sufficient size for use in cloning will
- * be returned ('pre-flighting')
- * If *pBufferSize is not enough for a stack-based safe clone,
- * new memory will be allocated.
- * @param status to indicate whether the operation went on smoothly or there were errors
- * An informational status value, U_SAFECLONE_ALLOCATED_ERROR, is used if any allocations were necessary.
- * @return pointer to the new clone
- * @stable ICU 2.0
- */
-U_STABLE UBreakIterator * U_EXPORT2
-ubrk_safeClone(
- const UBreakIterator *bi,
- void *stackBuffer,
- int32_t *pBufferSize,
- UErrorCode *status);
-
-#ifndef U_HIDE_DEPRECATED_API
-
-/**
- * A recommended size (in bytes) for the memory buffer to be passed to ubrk_saveClone().
- * @deprecated ICU 52. Do not rely on ubrk_safeClone() cloning into any provided buffer.
- */
-#define U_BRK_SAFECLONE_BUFFERSIZE 1
-
-#endif /* U_HIDE_DEPRECATED_API */
-
-/**
-* Close a UBreakIterator.
-* Once closed, a UBreakIterator may no longer be used.
-* @param bi The break iterator to close.
- * @stable ICU 2.0
-*/
-U_STABLE void U_EXPORT2
-ubrk_close(UBreakIterator *bi);
-
-#if U_SHOW_CPLUSPLUS_API
-
-U_NAMESPACE_BEGIN
-
-/**
- * \class LocalUBreakIteratorPointer
- * "Smart pointer" class, closes a UBreakIterator via ubrk_close().
- * For most methods see the LocalPointerBase base class.
- *
- * @see LocalPointerBase
- * @see LocalPointer
- * @stable ICU 4.4
- */
-U_DEFINE_LOCAL_OPEN_POINTER(LocalUBreakIteratorPointer, UBreakIterator, ubrk_close);
-
-U_NAMESPACE_END
-
-#endif
-
-/**
- * Sets an existing iterator to point to a new piece of text.
- * The break iterator retains a pointer to the supplied text.
- * The caller must not modify or delete the text while the BreakIterator
- * retains the reference.
- *
- * @param bi The iterator to use
- * @param text The text to be set
- * @param textLength The length of the text
- * @param status The error code
- * @stable ICU 2.0
- */
-U_STABLE void U_EXPORT2
-ubrk_setText(UBreakIterator* bi,
- const UChar* text,
- int32_t textLength,
- UErrorCode* status);
-
-
-/**
- * Sets an existing iterator to point to a new piece of text.
- *
- * All index positions returned by break iterator functions are
- * native indices from the UText. For example, when breaking UTF-8
- * encoded text, the break positions returned by \ref ubrk_next, \ref ubrk_previous, etc.
- * will be UTF-8 string indices, not UTF-16 positions.
- *
- * @param bi The iterator to use
- * @param text The text to be set.
- * This function makes a shallow clone of the supplied UText. This means
- * that the caller is free to immediately close or otherwise reuse the
- * UText that was passed as a parameter, but that the underlying text itself
- * must not be altered while being referenced by the break iterator.
- * @param status The error code
- * @stable ICU 3.4
- */
-U_STABLE void U_EXPORT2
-ubrk_setUText(UBreakIterator* bi,
- UText* text,
- UErrorCode* status);
-
-
-
-/**
- * Determine the most recently-returned text boundary.
- *
- * @param bi The break iterator to use.
- * @return The character index most recently returned by \ref ubrk_next, \ref ubrk_previous,
- * \ref ubrk_first, or \ref ubrk_last.
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_current(const UBreakIterator *bi);
-
-/**
- * Advance the iterator to the boundary following the current boundary.
- *
- * @param bi The break iterator to use.
- * @return The character index of the next text boundary, or UBRK_DONE
- * if all text boundaries have been returned.
- * @see ubrk_previous
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_next(UBreakIterator *bi);
-
-/**
- * Set the iterator position to the boundary preceding the current boundary.
- *
- * @param bi The break iterator to use.
- * @return The character index of the preceding text boundary, or UBRK_DONE
- * if all text boundaries have been returned.
- * @see ubrk_next
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_previous(UBreakIterator *bi);
-
-/**
- * Set the iterator position to zero, the start of the text being scanned.
- * @param bi The break iterator to use.
- * @return The new iterator position (zero).
- * @see ubrk_last
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_first(UBreakIterator *bi);
-
-/**
- * Set the iterator position to the index immediately <EM>beyond</EM> the last character in the text being scanned.
- * This is not the same as the last character.
- * @param bi The break iterator to use.
- * @return The character offset immediately <EM>beyond</EM> the last character in the
- * text being scanned.
- * @see ubrk_first
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_last(UBreakIterator *bi);
-
-/**
- * Set the iterator position to the first boundary preceding the specified offset.
- * The new position is always smaller than offset, or UBRK_DONE.
- * @param bi The break iterator to use.
- * @param offset The offset to begin scanning.
- * @return The text boundary preceding offset, or UBRK_DONE.
- * @see ubrk_following
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_preceding(UBreakIterator *bi,
- int32_t offset);
-
-/**
- * Advance the iterator to the first boundary following the specified offset.
- * The value returned is always greater than offset, or UBRK_DONE.
- * @param bi The break iterator to use.
- * @param offset The offset to begin scanning.
- * @return The text boundary following offset, or UBRK_DONE.
- * @see ubrk_preceding
- * @stable ICU 2.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_following(UBreakIterator *bi,
- int32_t offset);
-
-/**
-* Get a locale for which text breaking information is available.
-* A UBreakIterator in a locale returned by this function will perform the correct
-* text breaking for the locale.
-* @param index The index of the desired locale.
-* @return A locale for which number text breaking information is available, or 0 if none.
-* @see ubrk_countAvailable
-* @stable ICU 2.0
-*/
-U_STABLE const char* U_EXPORT2
-ubrk_getAvailable(int32_t index);
-
-/**
-* Determine how many locales have text breaking information available.
-* This function is most useful as determining the loop ending condition for
-* calls to \ref ubrk_getAvailable.
-* @return The number of locales for which text breaking information is available.
-* @see ubrk_getAvailable
-* @stable ICU 2.0
-*/
-U_STABLE int32_t U_EXPORT2
-ubrk_countAvailable(void);
-
-
-/**
-* Returns true if the specified position is a boundary position. As a side
-* effect, leaves the iterator pointing to the first boundary position at
-* or after "offset".
-* @param bi The break iterator to use.
-* @param offset the offset to check.
-* @return True if "offset" is a boundary position.
-* @stable ICU 2.0
-*/
-U_STABLE UBool U_EXPORT2
-ubrk_isBoundary(UBreakIterator *bi, int32_t offset);
-
-/**
- * Return the status from the break rule that determined the most recently
- * returned break position. The values appear in the rule source
- * within brackets, {123}, for example. For rules that do not specify a
- * status, a default value of 0 is returned.
- * <p>
- * For word break iterators, the possible values are defined in enum UWordBreak.
- * @stable ICU 2.2
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_getRuleStatus(UBreakIterator *bi);
-
-/**
- * Get the statuses from the break rules that determined the most recently
- * returned break position. The values appear in the rule source
- * within brackets, {123}, for example. The default status value for rules
- * that do not explicitly provide one is zero.
- * <p>
- * For word break iterators, the possible values are defined in enum UWordBreak.
- * @param bi The break iterator to use
- * @param fillInVec an array to be filled in with the status values.
- * @param capacity the length of the supplied vector. A length of zero causes
- * the function to return the number of status values, in the
- * normal way, without attempting to store any values.
- * @param status receives error codes.
- * @return The number of rule status values from rules that determined
- * the most recent boundary returned by the break iterator.
- * @stable ICU 3.0
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_getRuleStatusVec(UBreakIterator *bi, int32_t *fillInVec, int32_t capacity, UErrorCode *status);
-
-/**
- * Return the locale of the break iterator. You can choose between the valid and
- * the actual locale.
- * @param bi break iterator
- * @param type locale type (valid or actual)
- * @param status error code
- * @return locale string
- * @stable ICU 2.8
- */
-U_STABLE const char* U_EXPORT2
-ubrk_getLocaleByType(const UBreakIterator *bi, ULocDataLocaleType type, UErrorCode* status);
-
-/**
- * Set the subject text string upon which the break iterator is operating
- * without changing any other aspect of the state.
- * The new and previous text strings must have the same content.
- *
- * This function is intended for use in environments where ICU is operating on
- * strings that may move around in memory. It provides a mechanism for notifying
- * ICU that the string has been relocated, and providing a new UText to access the
- * string in its new position.
- *
- * Note that the break iterator never copies the underlying text
- * of a string being processed, but always operates directly on the original text
- * provided by the user. Refreshing simply drops the references to the old text
- * and replaces them with references to the new.
- *
- * Caution: this function is normally used only by very specialized
- * system-level code. One example use case is with garbage collection
- * that moves the text in memory.
- *
- * @param bi The break iterator.
- * @param text The new (moved) text string.
- * @param status Receives errors detected by this function.
- *
- * @stable ICU 49
- */
-U_STABLE void U_EXPORT2
-ubrk_refreshUText(UBreakIterator *bi,
- UText *text,
- UErrorCode *status);
-
-
-/**
- * Get a compiled binary version of the rules specifying the behavior of a UBreakIterator.
- * The binary rules may be used with ubrk_openBinaryRules to open a new UBreakIterator
- * more quickly than using ubrk_openRules. The compiled rules are not compatible across
- * different major versions of ICU, nor across platforms of different endianness or
- * different base character set family (ASCII vs EBCDIC). Supports preflighting (with
- * binaryRules=NULL and rulesCapacity=0) to get the rules length without copying them to
- * the binaryRules buffer. However, whether preflighting or not, if the actual length
- * is greater than INT32_MAX, then the function returns 0 and sets *status to
- * U_INDEX_OUTOFBOUNDS_ERROR.
-
- * @param bi The break iterator to use.
- * @param binaryRules Buffer to receive the compiled binary rules; set to NULL for
- * preflighting.
- * @param rulesCapacity Capacity (in bytes) of the binaryRules buffer; set to 0 for
- * preflighting. Must be >= 0.
- * @param status Pointer to UErrorCode to receive any errors, such as
- * U_BUFFER_OVERFLOW_ERROR, U_INDEX_OUTOFBOUNDS_ERROR, or
- * U_ILLEGAL_ARGUMENT_ERROR.
- * @return The actual byte length of the binary rules, if <= INT32_MAX;
- * otherwise 0. If not preflighting and this is larger than
- * rulesCapacity, *status will be set to an error.
- * @see ubrk_openBinaryRules
- * @stable ICU 59
- */
-U_STABLE int32_t U_EXPORT2
-ubrk_getBinaryRules(UBreakIterator *bi,
- uint8_t * binaryRules, int32_t rulesCapacity,
- UErrorCode * status);
-
-#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
-
-#endif