260 lines
9.5 KiB
C++
260 lines
9.5 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) 2012-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* collationdatabuilder.h
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*
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* created on: 2012apr01
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* created by: Markus W. Scherer
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*/
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#ifndef __COLLATIONDATABUILDER_H__
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#define __COLLATIONDATABUILDER_H__
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_COLLATION
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#include "unicode/uniset.h"
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#include "unicode/unistr.h"
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#include "unicode/uversion.h"
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#include "collation.h"
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#include "collationdata.h"
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#include "collationsettings.h"
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#include "normalizer2impl.h"
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#include "utrie2.h"
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#include "uvectr32.h"
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#include "uvectr64.h"
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#include "uvector.h"
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U_NAMESPACE_BEGIN
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struct ConditionalCE32;
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class CollationFastLatinBuilder;
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class CopyHelper;
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class DataBuilderCollationIterator;
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class UCharsTrieBuilder;
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/**
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* Low-level CollationData builder.
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* Takes (character, CE) pairs and builds them into runtime data structures.
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* Supports characters with context prefixes and contraction suffixes.
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*/
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class U_I18N_API CollationDataBuilder : public UObject {
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public:
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/**
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* Collation element modifier. Interface class for a modifier
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* that changes a tailoring builder's temporary CEs to final CEs.
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* Called for every non-special CE32 and every expansion CE.
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*/
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class CEModifier : public UObject {
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public:
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virtual ~CEModifier();
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/** Returns a new CE to replace the non-special input CE32, or else Collation::NO_CE. */
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virtual int64_t modifyCE32(uint32_t ce32) const = 0;
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/** Returns a new CE to replace the input CE, or else Collation::NO_CE. */
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virtual int64_t modifyCE(int64_t ce) const = 0;
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};
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CollationDataBuilder(UErrorCode &errorCode);
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virtual ~CollationDataBuilder();
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void initForTailoring(const CollationData *b, UErrorCode &errorCode);
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virtual UBool isCompressibleLeadByte(uint32_t b) const;
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inline UBool isCompressiblePrimary(uint32_t p) const {
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return isCompressibleLeadByte(p >> 24);
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}
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/**
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* @return TRUE if this builder has mappings (e.g., add() has been called)
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*/
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UBool hasMappings() const { return modified; }
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/**
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* @return TRUE if c has CEs in this builder
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*/
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UBool isAssigned(UChar32 c) const;
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/**
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* @return the three-byte primary if c maps to a single such CE and has no context data,
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* otherwise returns 0.
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*/
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uint32_t getLongPrimaryIfSingleCE(UChar32 c) const;
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/**
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* @return the single CE for c.
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* Sets an error code if c does not have a single CE.
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*/
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int64_t getSingleCE(UChar32 c, UErrorCode &errorCode) const;
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void add(const UnicodeString &prefix, const UnicodeString &s,
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const int64_t ces[], int32_t cesLength,
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UErrorCode &errorCode);
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/**
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* Encodes the ces as either the returned ce32 by itself,
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* or by storing an expansion, with the returned ce32 referring to that.
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*
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* add(p, s, ces, cesLength) = addCE32(p, s, encodeCEs(ces, cesLength))
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*/
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virtual uint32_t encodeCEs(const int64_t ces[], int32_t cesLength, UErrorCode &errorCode);
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void addCE32(const UnicodeString &prefix, const UnicodeString &s,
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uint32_t ce32, UErrorCode &errorCode);
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/**
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* Sets three-byte-primary CEs for a range of code points in code point order,
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* if it is worth doing; otherwise no change is made.
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* None of the code points in the range should have complex mappings so far
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* (expansions/contractions/prefixes).
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* @param start first code point
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* @param end last code point (inclusive)
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* @param primary primary weight for 'start'
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* @param step per-code point primary-weight increment
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* @param errorCode ICU in/out error code
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* @return TRUE if an OFFSET_TAG range was used for start..end
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*/
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UBool maybeSetPrimaryRange(UChar32 start, UChar32 end,
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uint32_t primary, int32_t step,
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UErrorCode &errorCode);
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/**
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* Sets three-byte-primary CEs for a range of code points in code point order.
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* Sets range values if that is worth doing, or else individual values.
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* None of the code points in the range should have complex mappings so far
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* (expansions/contractions/prefixes).
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* @param start first code point
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* @param end last code point (inclusive)
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* @param primary primary weight for 'start'
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* @param step per-code point primary-weight increment
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* @param errorCode ICU in/out error code
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* @return the next primary after 'end': start primary incremented by ((end-start)+1)*step
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*/
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uint32_t setPrimaryRangeAndReturnNext(UChar32 start, UChar32 end,
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uint32_t primary, int32_t step,
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UErrorCode &errorCode);
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/**
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* Copies all mappings from the src builder, with modifications.
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* This builder here must not be built yet, and should be empty.
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*/
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void copyFrom(const CollationDataBuilder &src, const CEModifier &modifier,
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UErrorCode &errorCode);
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void optimize(const UnicodeSet &set, UErrorCode &errorCode);
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void suppressContractions(const UnicodeSet &set, UErrorCode &errorCode);
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void enableFastLatin() { fastLatinEnabled = TRUE; }
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virtual void build(CollationData &data, UErrorCode &errorCode);
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/**
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* Looks up CEs for s and appends them to the ces array.
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* Does not handle normalization: s should be in FCD form.
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*
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* Does not write completely ignorable CEs.
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* Does not write beyond Collation::MAX_EXPANSION_LENGTH.
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*
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* @return incremented cesLength
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*/
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int32_t getCEs(const UnicodeString &s, int64_t ces[], int32_t cesLength);
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int32_t getCEs(const UnicodeString &prefix, const UnicodeString &s,
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int64_t ces[], int32_t cesLength);
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protected:
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friend class CopyHelper;
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friend class DataBuilderCollationIterator;
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uint32_t getCE32FromOffsetCE32(UBool fromBase, UChar32 c, uint32_t ce32) const;
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int32_t addCE(int64_t ce, UErrorCode &errorCode);
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int32_t addCE32(uint32_t ce32, UErrorCode &errorCode);
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int32_t addConditionalCE32(const UnicodeString &context, uint32_t ce32, UErrorCode &errorCode);
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inline ConditionalCE32 *getConditionalCE32(int32_t index) const {
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return static_cast<ConditionalCE32 *>(conditionalCE32s[index]);
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}
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inline ConditionalCE32 *getConditionalCE32ForCE32(uint32_t ce32) const {
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return getConditionalCE32(Collation::indexFromCE32(ce32));
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}
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static uint32_t makeBuilderContextCE32(int32_t index) {
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return Collation::makeCE32FromTagAndIndex(Collation::BUILDER_DATA_TAG, index);
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}
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static inline UBool isBuilderContextCE32(uint32_t ce32) {
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return Collation::hasCE32Tag(ce32, Collation::BUILDER_DATA_TAG);
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}
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static uint32_t encodeOneCEAsCE32(int64_t ce);
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uint32_t encodeOneCE(int64_t ce, UErrorCode &errorCode);
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uint32_t encodeExpansion(const int64_t ces[], int32_t length, UErrorCode &errorCode);
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uint32_t encodeExpansion32(const int32_t newCE32s[], int32_t length, UErrorCode &errorCode);
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uint32_t copyFromBaseCE32(UChar32 c, uint32_t ce32, UBool withContext, UErrorCode &errorCode);
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/**
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* Copies base contractions to a list of ConditionalCE32.
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* Sets cond->next to the index of the first new item
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* and returns the index of the last new item.
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*/
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int32_t copyContractionsFromBaseCE32(UnicodeString &context, UChar32 c, uint32_t ce32,
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ConditionalCE32 *cond, UErrorCode &errorCode);
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UBool getJamoCE32s(uint32_t jamoCE32s[], UErrorCode &errorCode);
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void setDigitTags(UErrorCode &errorCode);
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void setLeadSurrogates(UErrorCode &errorCode);
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void buildMappings(CollationData &data, UErrorCode &errorCode);
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void clearContexts();
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void buildContexts(UErrorCode &errorCode);
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uint32_t buildContext(ConditionalCE32 *head, UErrorCode &errorCode);
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int32_t addContextTrie(uint32_t defaultCE32, UCharsTrieBuilder &trieBuilder,
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UErrorCode &errorCode);
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void buildFastLatinTable(CollationData &data, UErrorCode &errorCode);
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int32_t getCEs(const UnicodeString &s, int32_t start, int64_t ces[], int32_t cesLength);
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static UChar32 jamoCpFromIndex(int32_t i) {
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// 0 <= i < CollationData::JAMO_CE32S_LENGTH = 19 + 21 + 27
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if(i < Hangul::JAMO_L_COUNT) { return Hangul::JAMO_L_BASE + i; }
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i -= Hangul::JAMO_L_COUNT;
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if(i < Hangul::JAMO_V_COUNT) { return Hangul::JAMO_V_BASE + i; }
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i -= Hangul::JAMO_V_COUNT;
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// i < 27
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return Hangul::JAMO_T_BASE + 1 + i;
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}
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/** @see Collation::BUILDER_DATA_TAG */
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static const uint32_t IS_BUILDER_JAMO_CE32 = 0x100;
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const Normalizer2Impl &nfcImpl;
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const CollationData *base;
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const CollationSettings *baseSettings;
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UTrie2 *trie;
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UVector32 ce32s;
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UVector64 ce64s;
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UVector conditionalCE32s; // vector of ConditionalCE32
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// Characters that have context (prefixes or contraction suffixes).
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UnicodeSet contextChars;
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// Serialized UCharsTrie structures for finalized contexts.
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UnicodeString contexts;
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UnicodeSet unsafeBackwardSet;
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UBool modified;
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UBool fastLatinEnabled;
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CollationFastLatinBuilder *fastLatinBuilder;
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DataBuilderCollationIterator *collIter;
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};
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U_NAMESPACE_END
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#endif // !UCONFIG_NO_COLLATION
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#endif // __COLLATIONDATABUILDER_H__
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