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Diffstat (limited to 'Build/source/libs/icu/icu-xetex/i18n/usrchimp.h')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/i18n/usrchimp.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/i18n/usrchimp.h b/Build/source/libs/icu/icu-xetex/i18n/usrchimp.h new file mode 100644 index 00000000000..fff52b2186e --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/i18n/usrchimp.h @@ -0,0 +1,134 @@ +/* +********************************************************************** +* Copyright (C) 2001-2007 IBM and others. All rights reserved. +********************************************************************** +* Date Name Description +* 08/13/2001 synwee Creation. +********************************************************************** +*/ +#ifndef USRCHIMP_H +#define USRCHIMP_H + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_COLLATION + +#include "unicode/ucol.h" +#include "unicode/ucoleitr.h" +#include "unicode/ubrk.h" + +#define INITIAL_ARRAY_SIZE_ 256 +#define MAX_TABLE_SIZE_ 257 + +struct USearch { + // required since collation element iterator does not have a getText API + const UChar *text; + int32_t textLength; // exact length + UBool isOverlap; + UBool isCanonicalMatch; + UBreakIterator *internalBreakIter; //internal character breakiterator + UBreakIterator *breakIter; + // value USEARCH_DONE is the default value + // if we are not at the start of the text or the end of the text, + // depending on the iteration direction and matchedIndex is USEARCH_DONE + // it means that we can find any more matches in that particular direction + int32_t matchedIndex; + int32_t matchedLength; + UBool isForwardSearching; + UBool reset; +}; + +struct UPattern { + const UChar *text; + int32_t textLength; // exact length + // length required for backwards ce comparison + int32_t CELength; + int32_t *CE; + int32_t CEBuffer[INITIAL_ARRAY_SIZE_]; + UBool hasPrefixAccents; + UBool hasSuffixAccents; + int16_t defaultShiftSize; + int16_t shift[MAX_TABLE_SIZE_]; + int16_t backShift[MAX_TABLE_SIZE_]; +}; + +struct UStringSearch { + struct USearch *search; + struct UPattern pattern; + const UCollator *collator; + // positions within the collation element iterator is used to determine + // if we are at the start of the text. + UCollationElements *textIter; + // utility collation element, used throughout program for temporary + // iteration. + UCollationElements *utilIter; + UBool ownCollator; + UCollationStrength strength; + uint32_t ceMask; + uint32_t variableTop; + UBool toShift; + UChar canonicalPrefixAccents[INITIAL_ARRAY_SIZE_]; + UChar canonicalSuffixAccents[INITIAL_ARRAY_SIZE_]; +}; + +/** +* Exact matches without checking for the ends for extra accents. +* The match after the position within the collation element iterator is to be +* found. +* After a match is found the offset in the collation element iterator will be +* shifted to the start of the match. +* Implementation note: +* For tertiary we can't use the collator->tertiaryMask, that is a +* preprocessed mask that takes into account case options. since we are only +* concerned with exact matches, we don't need that. +* Alternate handling - since only the 16 most significant digits is only used, +* we can safely do a compare without masking if the ce is a variable, we mask +* and get only the primary values no shifting to quartenary is required since +* all primary values less than variabletop will need to be masked off anyway. +* If the end character is composite and the pattern ce does not match the text +* ce, we skip it until we find a match in the end composite character or when +* it has passed the character. This is so that we can match pattern "a" with +* the text "\u00e6" +* @param strsrch string search data +* @param status error status if any +* @return TRUE if an exact match is found, FALSE otherwise +*/ +U_CFUNC +UBool usearch_handleNextExact(UStringSearch *strsrch, UErrorCode *status); + +/** +* Canonical matches. +* According to the definition, matches found here will include the whole span +* of beginning and ending accents if it overlaps that region. +* @param strsrch string search data +* @param status error status if any +* @return TRUE if a canonical match is found, FALSE otherwise +*/ +U_CFUNC +UBool usearch_handleNextCanonical(UStringSearch *strsrch, UErrorCode *status); + +/** +* Gets the previous match. +* Comments follows from handleNextExact +* @param strsrch string search data +* @param status error status if any +* @return True if a exact math is found, FALSE otherwise. +*/ +U_CFUNC +UBool usearch_handlePreviousExact(UStringSearch *strsrch, UErrorCode *status); + +/** +* Canonical matches. +* According to the definition, matches found here will include the whole span +* of beginning and ending accents if it overlaps that region. +* @param strsrch string search data +* @param status error status if any +* @return TRUE if a canonical match is found, FALSE otherwise +*/ +U_CFUNC +UBool usearch_handlePreviousCanonical(UStringSearch *strsrch, + UErrorCode *status); + +#endif /* #if !UCONFIG_NO_COLLATION */ + +#endif |