250 lines
9.1 KiB
C++
250 lines
9.1 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 2001-2015 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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#if !UCONFIG_NO_COLLATION
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#include "unicode/normalizer2.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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/* mask off anything but primary order */
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#define UCOL_PRIMARYORDERMASK 0xffff0000
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/* mask off anything but secondary order */
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#define UCOL_SECONDARYORDERMASK 0x0000ff00
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/* mask off anything but tertiary order */
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#define UCOL_TERTIARYORDERMASK 0x000000ff
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/* primary order shift */
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#define UCOL_PRIMARYORDERSHIFT 16
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/* secondary order shift */
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#define UCOL_SECONDARYORDERSHIFT 8
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#define UCOL_IGNORABLE 0
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/* get weights from a CE */
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#define UCOL_PRIMARYORDER(order) (((order) >> 16) & 0xffff)
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#define UCOL_SECONDARYORDER(order) (((order) & UCOL_SECONDARYORDERMASK)>> UCOL_SECONDARYORDERSHIFT)
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#define UCOL_TERTIARYORDER(order) ((order) & UCOL_TERTIARYORDERMASK)
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#define UCOL_CONTINUATION_MARKER 0xC0
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#define isContinuation(CE) (((CE) & UCOL_CONTINUATION_MARKER) == UCOL_CONTINUATION_MARKER)
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/**
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* This indicates an error has occured during processing or there are no more CEs
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* to be returned.
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*/
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#define UCOL_PROCESSED_NULLORDER ((int64_t)U_INT64_MAX)
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U_NAMESPACE_BEGIN
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class CollationElementIterator;
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class Collator;
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struct PCEI
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{
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uint64_t ce;
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int32_t low;
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int32_t high;
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};
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struct PCEBuffer
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{
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PCEI defaultBuffer[16];
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PCEI *buffer;
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int32_t bufferIndex;
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int32_t bufferSize;
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PCEBuffer();
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~PCEBuffer();
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void reset();
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UBool isEmpty() const;
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void put(uint64_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode);
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const PCEI *get();
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};
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class UCollationPCE : public UMemory {
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private:
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PCEBuffer pceBuffer;
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CollationElementIterator *cei;
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UCollationStrength strength;
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UBool toShift;
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UBool isShifted;
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uint32_t variableTop;
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public:
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UCollationPCE(UCollationElements *elems);
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UCollationPCE(CollationElementIterator *iter);
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~UCollationPCE();
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void init(UCollationElements *elems);
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void init(CollationElementIterator *iter);
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/**
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* Get the processed ordering priority of the next collation element in the text.
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* A single character may contain more than one collation element.
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*
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* @param ixLow a pointer to an int32_t to receive the iterator index before fetching the CE.
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* @param ixHigh a pointer to an int32_t to receive the iterator index after fetching the CE.
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* @param status A pointer to an UErrorCode to receive any errors.
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* @return The next collation elements ordering, otherwise returns UCOL_PROCESSED_NULLORDER
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* if an error has occured or if the end of string has been reached
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*/
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int64_t nextProcessed(int32_t *ixLow, int32_t *ixHigh, UErrorCode *status);
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/**
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* Get the processed ordering priority of the previous collation element in the text.
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* A single character may contain more than one collation element.
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*
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* @param ixLow A pointer to an int32_t to receive the iterator index after fetching the CE
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* @param ixHigh A pointer to an int32_t to receiver the iterator index before fetching the CE
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* @param status A pointer to an UErrorCode to receive any errors. Noteably
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* a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack
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* buffer has been exhausted.
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* @return The previous collation elements ordering, otherwise returns
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* UCOL_PROCESSED_NULLORDER if an error has occured or if the start of
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* string has been reached.
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*/
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int64_t previousProcessed(int32_t *ixLow, int32_t *ixHigh, UErrorCode *status);
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private:
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void init(const Collator &coll);
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uint64_t processCE(uint32_t ce);
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};
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U_NAMESPACE_END
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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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int16_t elementComparisonType;
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UBreakIterator *internalBreakIter; //internal character breakiterator
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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't find any more matches in that particular direction
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int32_t 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 cesLength;
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int32_t *ces;
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int32_t cesBuffer[INITIAL_ARRAY_SIZE_];
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int32_t pcesLength;
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int64_t *pces;
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int64_t pcesBuffer[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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const icu::Normalizer2 *nfd;
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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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icu::UCollationPCE *textProcessedIter;
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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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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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* @return True if a exact math is found, FALSE otherwise.
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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 /* #if !UCONFIG_NO_COLLATION */
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#endif
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