315 lines
11 KiB
C
315 lines
11 KiB
C
|
/*
|
|||
|
|
* Copyright <EFBFBD> {1996-1999}, International Business Machines Corporation and others. All Rights Reserved.
|
|||
|
|
*****************************************************************************************
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#ifndef UBRK_H
|
|||
|
|
#define UBRK_H
|
|||
|
|
|
|||
|
|
#include "unicode/utypes.h"
|
|||
|
|
/**
|
|||
|
|
* @name BreakIterator C API
|
|||
|
|
*
|
|||
|
|
* 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>
|
|||
|
|
* 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>
|
|||
|
|
* 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 allows users to interact with
|
|||
|
|
* characters as they expect to, for example, when moving the cursor
|
|||
|
|
* through a text string. Character boundary analysis provides correct
|
|||
|
|
* navigation of through character strings, regardless of how the
|
|||
|
|
* character is stored. For example, an accented character might be
|
|||
|
|
* stored as a base character and a diacritical mark. What users
|
|||
|
|
* consider to be a character can differ between languages.
|
|||
|
|
* <P>
|
|||
|
|
* This is the interface for all text boundaries.
|
|||
|
|
* <P>
|
|||
|
|
* Examples:
|
|||
|
|
* <P>
|
|||
|
|
* Helper function to output text
|
|||
|
|
* <pre>
|
|||
|
|
* . void printTextRange(UChar* str, UTextOffset start, UTextOffset end ) {
|
|||
|
|
* . UChar* result;
|
|||
|
|
* . UChar* temp;
|
|||
|
|
* . const char* res;
|
|||
|
|
* . temp=(UChar*)malloc(sizeof(UChar) * ((u_strlen(str)-start)+1));
|
|||
|
|
* . result=(UChar*)malloc(sizeof(UChar) * ((end-start)+1));
|
|||
|
|
* . u_strcpy(temp, &str[start]);
|
|||
|
|
* . u_strncpy(result, temp, end-start);
|
|||
|
|
* . res=(char*)malloc(sizeof(char) * (u_strlen(result)+1));
|
|||
|
|
* . u_austrcpy(res, result);
|
|||
|
|
* . printf("%s\n", res);
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Print each element in order:
|
|||
|
|
* <pre>
|
|||
|
|
* . void printEachForward( UBreakIterator* boundary, UChar* str) {
|
|||
|
|
* . UTextOffset end;
|
|||
|
|
* . UTextOffset start = ubrk_first(boundary);
|
|||
|
|
* . for (end = ubrk_next(boundary)); end != UBRK_DONE; start = end, end = ubrk_next(boundary)) {
|
|||
|
|
* . printTextRange(str, start, end );
|
|||
|
|
* . }
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Print each element in reverse order:
|
|||
|
|
* <pre>
|
|||
|
|
* . void printEachBackward( UBreakIterator* boundary, UChar* str) {
|
|||
|
|
* . UTextOffset start;
|
|||
|
|
* . UTextOffset end = ubrk_last(boundary);
|
|||
|
|
* . for (start = ubrk_previous(boundary); start != UBRK_DONE; end = start, start =ubrk_previous(boundary)) {
|
|||
|
|
* . printTextRange( str, start, end );
|
|||
|
|
* . }
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Print first element
|
|||
|
|
* <pre>
|
|||
|
|
* . void printFirst(UBreakIterator* boundary, UChar* str) {
|
|||
|
|
* . UTextOffset end;
|
|||
|
|
* . UTextOffset start = ubrk_first(boundary);
|
|||
|
|
* . end = ubrk_next(boundary);
|
|||
|
|
* . printTextRange( str, start, end );
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Print last element
|
|||
|
|
* <pre>
|
|||
|
|
* . void printLast(UBreakIterator* boundary, UChar* str) {
|
|||
|
|
* . UTextOffset start;
|
|||
|
|
* . UTextOffset end = ubrk_last(boundary);
|
|||
|
|
* . start = ubrk_previous(boundary);
|
|||
|
|
* . printTextRange(str, start, end );
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Print the element at a specified position
|
|||
|
|
* <pre>
|
|||
|
|
* . void printAt(UBreakIterator* boundary, UTextOffset pos , UChar* str) {
|
|||
|
|
* . UTextOffset start;
|
|||
|
|
* . UTextOffset end = ubrk_following(boundary, pos);
|
|||
|
|
* . start = ubrk_previous(boundary);
|
|||
|
|
* . printTextRange(str, start, end );
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
* Creating and using text boundaries
|
|||
|
|
* <pre>
|
|||
|
|
* . void BreakIterator_Example( void ) {
|
|||
|
|
* . UBreakIterator* boundary;
|
|||
|
|
* . UChar *stringToExamine;
|
|||
|
|
* . stringToExamine=(UChar*)malloc(sizeof(UChar) * (strlen("Aaa bbb ccc. Ddd eee fff.")+1) );
|
|||
|
|
* . u_uastrcpy(stringToExamine, "Aaa bbb ccc. Ddd eee fff.");
|
|||
|
|
* . printf("Examining: "Aaa bbb ccc. Ddd eee fff.");
|
|||
|
|
* .
|
|||
|
|
* . //print each sentence in forward and reverse order
|
|||
|
|
* . boundary = ubrk_open(UBRK_SENTENCE, "en_us", stringToExamine, u_strlen(stringToExamine), &status);
|
|||
|
|
* . printf("----- forward: -----------\n");
|
|||
|
|
* . printEachForward(boundary, stringToExamine);
|
|||
|
|
* . printf("----- backward: ----------\n");
|
|||
|
|
* . printEachBackward(boundary, stringToExamine);
|
|||
|
|
* . ubrk_close(boundary);
|
|||
|
|
* .
|
|||
|
|
* . //print each word in order
|
|||
|
|
* . boundary = ubrk_open(UBRK_WORD, "en_us", stringToExamine, u_strlen(stringToExamine), &status);
|
|||
|
|
* . printf("----- forward: -----------\n");
|
|||
|
|
* . printEachForward(boundary, stringToExamine);
|
|||
|
|
* . printf("----- backward: ----------\n");
|
|||
|
|
* . printEachBackward(boundary, stringToExamine);
|
|||
|
|
* . //print first element
|
|||
|
|
* . printf("----- first: -------------\n");
|
|||
|
|
* . printFirst(boundary, stringToExamine);
|
|||
|
|
* . //print last element
|
|||
|
|
* . printf("----- last: --------------\n");
|
|||
|
|
* . printLast(boundary, stringToExamine);
|
|||
|
|
* . //print word at charpos 10
|
|||
|
|
* . printf("----- at pos 10: ---------\n");
|
|||
|
|
* . printAt(boundary, 10 , stringToExamine);
|
|||
|
|
* .
|
|||
|
|
* . ubrk_close(boundary);
|
|||
|
|
* . }
|
|||
|
|
* </pre>
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* A text-break iterator.
|
|||
|
|
* For usage in C programs.
|
|||
|
|
*/
|
|||
|
|
typedef void* UBreakIterator;
|
|||
|
|
|
|||
|
|
/** The possible types of text boundaries. */
|
|||
|
|
enum UBreakIteratorType {
|
|||
|
|
/** Character breaks */
|
|||
|
|
UBRK_CHARACTER,
|
|||
|
|
/** Word breaks */
|
|||
|
|
UBRK_WORD,
|
|||
|
|
/** Line breaks */
|
|||
|
|
UBRK_LINE,
|
|||
|
|
/** Sentence breaks */
|
|||
|
|
UBRK_SENTENCE
|
|||
|
|
};
|
|||
|
|
typedef enum UBreakIteratorType UBreakIteratorType;
|
|||
|
|
|
|||
|
|
/** Value indicating all text boundaries have been returned.
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
#define UBRK_DONE ((UTextOffset) -1)
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 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.
|
|||
|
|
* @param text The text to be iterated over.
|
|||
|
|
* @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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UBreakIterator*
|
|||
|
|
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.
|
|||
|
|
* @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 rules.
|
|||
|
|
* @see ubrk_open
|
|||
|
|
*/
|
|||
|
|
U_CAPI UBreakIterator*
|
|||
|
|
ubrk_openRules(const UChar *rules,
|
|||
|
|
int32_t rulesLength,
|
|||
|
|
const UChar *text,
|
|||
|
|
int32_t textLength,
|
|||
|
|
UErrorCode *status);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Close a UBreakIterator.
|
|||
|
|
* Once closed, a UBreakIterator may no longer be used.
|
|||
|
|
* @param bi The break iterator to close.
|
|||
|
|
*/
|
|||
|
|
U_CAPI void
|
|||
|
|
ubrk_close(UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 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}.
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_current(const UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine the text boundary following the current text 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_next(UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine the text boundary preceding the current text 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_previous(UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine the index of the first character in the text being scanned.
|
|||
|
|
* This is not always the same as index 0 of the text.
|
|||
|
|
* @param bi The break iterator to use.
|
|||
|
|
* @return The character index of the first character in the text being scanned.
|
|||
|
|
* @see ubrk_last
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_first(UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_last(UBreakIterator *bi);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine the text boundary preceding the specified offset.
|
|||
|
|
* The value returned 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_preceding(UBreakIterator *bi,
|
|||
|
|
UTextOffset offset);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Determine the text 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI UTextOffset
|
|||
|
|
ubrk_following(UBreakIterator *bi,
|
|||
|
|
UTextOffset 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
|
|||
|
|
*/
|
|||
|
|
U_CAPI const char*
|
|||
|
|
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
|
|||
|
|
*/
|
|||
|
|
U_CAPI int32_t
|
|||
|
|
ubrk_countAvailable(void);
|
|||
|
|
|
|||
|
|
#endif
|