483 lines
17 KiB
C
483 lines
17 KiB
C
/*
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******************************************************************************
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* Copyright (C) 1996-2007, 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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/**
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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 void 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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* 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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* 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 allows users to interact with
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* characters as they expect to, for example, when moving the cursor
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* through a text string. Character boundary analysis provides correct
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* navigation of through character strings, regardless of how the
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* character is stored. For example, an accented character might be
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* stored as a base character and a diacritical mark. What users
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* consider to be a character can differ between languages.
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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 snippits 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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#endif /* U_HIDE_DEPRECATED_API */
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UBRK_COUNT = 5
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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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* @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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* @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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* @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.
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* @param text The text to be iterated over.
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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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* Thread safe cloning operation
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* @param bi iterator to be cloned
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* @param stackBuffer 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. This will probably be enough to avoid memory allocations.
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* @param pBufferSize 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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/**
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* A recommended size (in bytes) for the memory buffer to be passed to ubrk_saveClone().
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* @stable ICU 2.0
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*/
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#define U_BRK_SAFECLONE_BUFFERSIZE 512
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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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/**
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* Sets an existing iterator to point to a new piece of text
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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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* @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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* Determine the text boundary following the current 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 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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* Determine the text boundary preceding the current 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 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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* Determine the index of the first character in the text being scanned.
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* This is not always the same as index 0 of the text.
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* @param bi The break iterator to use.
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* @return The character index of the first character in the text being scanned.
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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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* Determine the index immediately <EM>beyond</EM> the last character in the text being
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* 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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* Determine the text boundary preceding the specified offset.
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* The value returned 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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* Determine the text 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
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ubrk_following(UBreakIterator *bi,
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int32_t offset);
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/**
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* Get a locale for which text breaking information is available.
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* A UBreakIterator in a locale returned by this function will perform the correct
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* text breaking for the locale.
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* @param index The index of the desired locale.
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* @return A locale for which number text breaking information is available, or 0 if none.
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* @see ubrk_countAvailable
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* @stable ICU 2.0
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*/
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U_STABLE const char* U_EXPORT2
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ubrk_getAvailable(int32_t index);
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/**
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* Determine how many locales have text breaking information available.
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* This function is most useful as determining the loop ending condition for
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* calls to \ref ubrk_getAvailable.
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* @return The number of locales for which text breaking information is available.
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* @see ubrk_getAvailable
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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_countAvailable(void);
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/**
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* Returns true if the specfied position is a boundary position. As a side
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* effect, leaves the iterator pointing to the first boundary position at
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* or after "offset".
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* @param bi The break iterator to use.
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* @param offset the offset to check.
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* @return True if "offset" is a boundary position.
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* @stable ICU 2.0
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*/
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U_STABLE UBool U_EXPORT2
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ubrk_isBoundary(UBreakIterator *bi, int32_t offset);
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/**
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* Return the status from the break rule that determined the most recently
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* returned break position. The values appear in the rule source
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* within brackets, {123}, for example. For rules that do not specify a
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* status, a default value of 0 is returned.
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* <p>
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* For word break iterators, the possible values are defined in enum UWordBreak.
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* @stable ICU 2.2
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*/
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U_STABLE int32_t U_EXPORT2
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ubrk_getRuleStatus(UBreakIterator *bi);
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/**
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* Get the statuses from the break rules that determined the most recently
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* returned break position. The values appear in the rule source
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* within brackets, {123}, for example. The default status value for rules
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* that do not explicitly provide one is zero.
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* <p>
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* For word break iterators, the possible values are defined in enum UWordBreak.
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* @param bi The break iterator to use
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* @param fillInVec an array to be filled in with the status values.
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* @param capacity the length of the supplied vector. A length of zero causes
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* the function to return the number of status values, in the
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* normal way, without attemtping to store any values.
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* @param status receives error codes.
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* @return The number of rule status values from rules that determined
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* the most recent boundary returned by the break iterator.
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* @stable ICU 3.0
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*/
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U_STABLE int32_t U_EXPORT2
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ubrk_getRuleStatusVec(UBreakIterator *bi, int32_t *fillInVec, int32_t capacity, UErrorCode *status);
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/**
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* Return the locale of the break iterator. You can choose between the valid and
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* the actual locale.
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* @param bi break iterator
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* @param type locale type (valid or actual)
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* @param status error code
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* @return locale string
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* @stable ICU 2.8
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*/
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U_STABLE const char* U_EXPORT2
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ubrk_getLocaleByType(const UBreakIterator *bi, ULocDataLocaleType type, UErrorCode* status);
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#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
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#endif
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