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