usearch.h

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* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedStart(
                                               const UStringSearch *strsrch);
    
/**
* Returns the length of text in the string which matches the search pattern. 
* This call returns a valid result only after a successful call to 
* <tt>usearch_first</tt>, <tt>usearch_next</tt>, <tt>usearch_previous</tt>, 
* or <tt>usearch_last</tt>.
* Just after construction, or after a searching method returns 
* <tt>USEARCH_DONE</tt>, this method will return 0.
* @param strsrch search iterator data struct
* @return The length of the match in the string text, or 0 if there is no 
*         match currently.
* @see #usearch_first
* @see #usearch_next
* @see #usearch_previous
* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedLength(
                                               const UStringSearch *strsrch);

/**
* Returns the text that was matched by the most recent call to 
* <tt>usearch_first</tt>, <tt>usearch_next</tt>, <tt>usearch_previous</tt>, 
* or <tt>usearch_last</tt>.
* If the iterator is not pointing at a valid match (e.g. just after 
* construction or after <tt>USEARCH_DONE</tt> has been returned, returns
* an empty string. If result is not large enough to store the matched text,
* result will be filled with the partial text and an U_BUFFER_OVERFLOW_ERROR 
* will be returned in status. result will be null-terminated whenever 
* possible. If the buffer fits the matched text exactly, a null-termination 
* is not possible, then a U_STRING_NOT_TERMINATED_ERROR set in status.
* Pre-flighting can be either done with length = 0 or the API 
* <tt>usearch_getMatchLength</tt>.
* @param strsrch search iterator data struct
* @param result UChar buffer to store the matched string
* @param resultCapacity length of the result buffer
* @param status error returned if result is not large enough
* @return exact length of the matched text, not counting the null-termination
* @see #usearch_first
* @see #usearch_next
* @see #usearch_previous
* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedText(const UStringSearch *strsrch, 
                                            UChar         *result, 
                                            int32_t        resultCapacity, 
                                            UErrorCode    *status);

#if !UCONFIG_NO_BREAK_ITERATION

/**
* Set the BreakIterator that will be used to restrict the points at which 
* matches are detected.
* @param strsrch search iterator data struct
* @param breakiter A BreakIterator that will be used to restrict the points
*                  at which matches are detected. If a match is found, but 
*                  the match's start or end index is not a boundary as 
*                  determined by the <tt>BreakIterator</tt>, the match will 
*                  be rejected and another will be searched for. 
*                  If this parameter is <tt>NULL</tt>, no break detection is 
*                  attempted.
* @param status for errors if it occurs
* @see #usearch_getBreakIterator
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setBreakIterator(UStringSearch  *strsrch, 
                                               UBreakIterator *breakiter,
                                               UErrorCode     *status);

/**
* Returns the BreakIterator that is used to restrict the points at which 
* matches are detected. This will be the same object that was passed to the 
* constructor or to <tt>usearch_setBreakIterator</tt>. Note that 
* <tt>NULL</tt> 
* is a legal value; it means that break detection should not be attempted.
* @param strsrch search iterator data struct
* @return break iterator used
* @see #usearch_setBreakIterator
* @stable ICU 2.4
*/
U_STABLE const UBreakIterator * U_EXPORT2 usearch_getBreakIterator(
                                              const UStringSearch *strsrch);
    
#endif
    
/**
* Set the string text to be searched. Text iteration will hence begin at the 
* start of the text string. This method is useful if you want to re-use an 
* iterator to search for the same pattern within a different body of text.
* @param strsrch search iterator data struct
* @param text new string to look for match
* @param textlength length of the new string, -1 for null-termination
* @param status for errors if it occurs. If text is NULL, or textlength is 0 
*               then an U_ILLEGAL_ARGUMENT_ERROR is returned with no change
*               done to strsrch.
* @see #usearch_getText
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setText(      UStringSearch *strsrch, 
                                      const UChar         *text,
                                            int32_t        textlength,
                                            UErrorCode    *status);

/**
* Return the string text to be searched.
* @param strsrch search iterator data struct
* @param length returned string text length
* @return string text 
* @see #usearch_setText
* @stable ICU 2.4
*/
U_STABLE const UChar * U_EXPORT2 usearch_getText(const UStringSearch *strsrch, 
                                               int32_t       *length);

/**
* Gets the collator used for the language rules. 
* <p>
* Deleting the returned <tt>UCollator</tt> before calling 
* <tt>usearch_close</tt> would cause the string search to fail.
* <tt>usearch_close</tt> will delete the collator if this search owns it.
* @param strsrch search iterator data struct
* @return collator
* @stable ICU 2.4
*/
U_STABLE UCollator * U_EXPORT2 usearch_getCollator(
                                               const UStringSearch *strsrch);

/**
* Sets the collator used for the language rules. User retains the ownership 
* of this collator, thus the responsibility of deletion lies with the user.
* This method causes internal data such as Boyer-Moore shift tables to  
* be recalculated, but the iterator's position is unchanged.
* @param strsrch search iterator data struct
* @param collator to be used
* @param status for errors if it occurs
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setCollator(      UStringSearch *strsrch, 
                                          const UCollator     *collator,
                                                UErrorCode    *status);

/**
* Sets the pattern used for matching.
* Internal data like the Boyer Moore table will be recalculated, but the 
* iterator's position is unchanged.
* @param strsrch search iterator data struct
* @param pattern string
* @param patternlength pattern length, -1 for null-terminated string
* @param status for errors if it occurs. If text is NULL, or textlength is 0 
*               then an U_ILLEGAL_ARGUMENT_ERROR is returned with no change
*               done to strsrch.
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setPattern(      UStringSearch *strsrch, 
                                         const UChar         *pattern,
                                               int32_t        patternlength,
                                               UErrorCode    *status);

/**
* Gets the search pattern
* @param strsrch search iterator data struct
* @param length return length of the pattern, -1 indicates that the pattern 
*               is null-terminated
* @return pattern string
* @stable ICU 2.4
*/
U_STABLE const UChar * U_EXPORT2 usearch_getPattern(
                                               const UStringSearch *strsrch, 
                                                     int32_t       *length);

/* methods ------------------------------------------------------------- */

/**
* Returns the first index at which the string text matches the search 
* pattern.  
* The iterator is adjusted so that its current index (as returned by 
* <tt>usearch_getOffset</tt>) is the match position if one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>.
* @param strsrch search iterator data struct
* @param status for errors if it occurs
* @return The character index of the first match, or 
* <tt>USEARCH_DONE</tt> if there are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_first(UStringSearch *strsrch, 
                                           UErrorCode    *status);

/**
* Returns the first index greater than <tt>position</tt> at which the string 
* text 
* matches the search pattern. The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_getOffset</tt>) is the match position if 
* one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>
* <p>
* Search positions that may render incorrect results are highlighted in the
* header comments. If position is less than or greater than the text range 
* for searching, an U_INDEX_OUTOFBOUNDS_ERROR will be returned
* @param strsrch search iterator data struct
* @param position to start the search at
* @param status for errors if it occurs
* @return The character index of the first match following <tt>pos</tt>,
*         or <tt>USEARCH_DONE</tt> if there are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_following(UStringSearch *strsrch, 
                                               int32_t    position, 
                                               UErrorCode    *status);
    
/**
* Returns the last index in the target text at which it matches the search 
* pattern. The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_getOffset</tt>) is the match position if 
* one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>.
* @param strsrch search iterator data struct
* @param status for errors if it occurs
* @return The index of the first match, or <tt>USEARCH_DONE</tt> if there 
*         are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_last(UStringSearch *strsrch, 
                                          UErrorCode    *status);

/**
* Returns the first index less than <tt>position</tt> at which the string text 
* matches the search pattern. The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_getOffset</tt>) is the match position if 
* one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>
* <p>
* Search positions that may render incorrect results are highlighted in the
* header comments. If position is less than or greater than the text range 
* for searching, an U_INDEX_OUTOFBOUNDS_ERROR will be returned
* @param strsrch search iterator data struct
* @param position index position the search is to begin at
* @param status for errors if it occurs
* @return The character index of the first match preceding <tt>pos</tt>,
*         or <tt>USEARCH_DONE</tt> if there are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_preceding(UStringSearch *strsrch, 
                                               int32_t    position, 
                                               UErrorCode    *status);
    
/**
* Returns the index of the next point at which the string text matches the
* search pattern, starting from the current position.
* The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_getOffset</tt>) is the match position if 
* one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>
* @param strsrch search iterator data struct
* @param status for errors if it occurs
* @return The index of the next match after the current position, or 
*         <tt>USEARCH_DONE</tt> if there are no more matches.
* @see #usearch_first
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_next(UStringSearch *strsrch, 
                                          UErrorCode    *status);

/**
* Returns the index of the previous point at which the string text matches
* the search pattern, starting at the current position.
* The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_getOffset</tt>) is the match position if 
* one was found.
* If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
* the iterator will be adjusted to the index <tt>USEARCH_DONE</tt>
* @param strsrch search iterator data struct
* @param status for errors if it occurs
* @return The index of the previous match before the current position,
*         or <tt>USEARCH_DONE</tt> if there are no more matches.
* @see #usearch_last
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_previous(UStringSearch *strsrch, 
                                              UErrorCode    *status);
    
/** 
* Reset the iteration.
* Search will begin at the start of the text string if a forward iteration 
* is initiated before a backwards iteration. Otherwise if a backwards 
* iteration is initiated before a forwards iteration, the search will begin
* at the end of the text string.
* @param strsrch search iterator data struct
* @see #usearch_first
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_reset(UStringSearch *strsrch);

#endif /* #if !UCONFIG_NO_COLLATION */

#endif