131 lines
5.0 KiB
C
131 lines
5.0 KiB
C
/*
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**********************************************************************
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* Copyright (C) 2001 IBM and others. All rights reserved.
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**********************************************************************
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* Date Name Description
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* 08/13/2001 synwee Creation.
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**********************************************************************
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*/
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#ifndef USRCHIMP_H
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#define USRCHIMP_H
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#include "unicode/utypes.h"
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#include "unicode/ucol.h"
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#include "unicode/ucoleitr.h"
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#include "unicode/ubrk.h"
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#define INITIAL_ARRAY_SIZE_ 256
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#define MAX_TABLE_SIZE_ 257
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struct USearch {
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// required since collation element iterator does not have a getText API
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const UChar *text;
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int32_t textLength; // exact length
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UBool isOverlap;
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UBool isCanonicalMatch;
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UBreakIterator *breakIter;
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// value USEARCH_DONE is the default value
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// if we are not at the start of the text or the end of the text,
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// depending on the iteration direction and matchedIndex is USEARCH_DONE
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// it means that we can find any more matches in that particular direction
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UTextOffset matchedIndex;
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int32_t matchedLength;
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UBool isForwardSearching;
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UBool reset;
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};
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struct UPattern {
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const UChar *text;
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int32_t textLength; // exact length
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// length required for backwards ce comparison
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int32_t CELength;
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uint32_t *CE;
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uint32_t CEBuffer[INITIAL_ARRAY_SIZE_];
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UBool hasPrefixAccents;
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UBool hasSuffixAccents;
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int16_t defaultShiftSize;
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int16_t shift[MAX_TABLE_SIZE_];
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int16_t backShift[MAX_TABLE_SIZE_];
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};
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struct UStringSearch {
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struct USearch *search;
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struct UPattern pattern;
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const UCollator *collator;
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// positions within the collation element iterator is used to determine
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// if we are at the start of the text.
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UCollationElements *textIter;
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// utility collation element, used throughout program for temporary
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// iteration.
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UCollationElements *utilIter;
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UBool ownCollator;
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UBool toNormalize;
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UCollationStrength strength;
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uint32_t ceMask;
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uint32_t variableTop;
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UBool toShift;
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UChar canonicalPrefixAccents[INITIAL_ARRAY_SIZE_];
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UChar canonicalSuffixAccents[INITIAL_ARRAY_SIZE_];
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};
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/**
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* Exact matches without checking for the ends for extra accents.
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* The match after the position within the collation element iterator is to be
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* found.
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* After a match is found the offset in the collation element iterator will be
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* shifted to the start of the match.
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* Implementation note:
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* For tertiary we can't use the collator->tertiaryMask, that is a
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* preprocessed mask that takes into account case options. since we are only
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* concerned with exact matches, we don't need that.
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* Alternate handling - since only the 16 most significant digits is only used,
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* we can safely do a compare without masking if the ce is a variable, we mask
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* and get only the primary values no shifting to quartenary is required since
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* all primary values less than variabletop will need to be masked off anyway.
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* If the end character is composite and the pattern ce does not match the text
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* ce, we skip it until we find a match in the end composite character or when
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* it has passed the character. This is so that we can match pattern "a" with
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* the text "\u00e6"
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* @param strsrch string search data
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* @param status error status if any
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* @return TRUE if an exact match is found, FALSE otherwise
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*/
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U_CFUNC
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UBool usearch_handleNextExact(UStringSearch *strsrch, UErrorCode *status);
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/**
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* Canonical matches.
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* According to the definition, matches found here will include the whole span
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* of beginning and ending accents if it overlaps that region.
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* @param strsrch string search data
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* @param status error status if any
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* @return TRUE if a canonical match is found, FALSE otherwise
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*/
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U_CFUNC
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UBool usearch_handleNextCanonical(UStringSearch *strsrch, UErrorCode *status);
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/**
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* Gets the previous match.
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* Comments follows from handleNextExact
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* @param strsrch string search data
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* @param status error status if any
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*/
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U_CFUNC
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UBool usearch_handlePreviousExact(UStringSearch *strsrch, UErrorCode *status);
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/**
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* Canonical matches.
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* According to the definition, matches found here will include the whole span
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* of beginning and ending accents if it overlaps that region.
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* @param strsrch string search data
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* @param status error status if any
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* @return TRUE if a canonical match is found, FALSE otherwise
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*/
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U_CFUNC
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UBool usearch_handlePreviousCanonical(UStringSearch *strsrch,
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UErrorCode *status);
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#endif
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