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Diffstat (limited to 'deps/icu-small/source/i18n/collationbuilder.h')
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diff --git a/deps/icu-small/source/i18n/collationbuilder.h b/deps/icu-small/source/i18n/collationbuilder.h new file mode 100644 index 0000000000..cd499a4e92 --- /dev/null +++ b/deps/icu-small/source/i18n/collationbuilder.h @@ -0,0 +1,407 @@ +/* +******************************************************************************* +* Copyright (C) 2013-2014, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************* +* collationbuilder.h +* +* created on: 2013may06 +* created by: Markus W. Scherer +*/ + +#ifndef __COLLATIONBUILDER_H__ +#define __COLLATIONBUILDER_H__ + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_COLLATION + +#include "unicode/uniset.h" +#include "unicode/unistr.h" +#include "collationrootelements.h" +#include "collationruleparser.h" +#include "uvectr32.h" +#include "uvectr64.h" + +struct UParseError; + +U_NAMESPACE_BEGIN + +struct CollationData; +struct CollationTailoring; + +class CEFinalizer; +class CollationDataBuilder; +class Normalizer2; +class Normalizer2Impl; + +class U_I18N_API CollationBuilder : public CollationRuleParser::Sink { +public: + CollationBuilder(const CollationTailoring *base, UErrorCode &errorCode); + virtual ~CollationBuilder(); + + void disableFastLatin() { fastLatinEnabled = FALSE; } + + CollationTailoring *parseAndBuild(const UnicodeString &ruleString, + const UVersionInfo rulesVersion, + CollationRuleParser::Importer *importer, + UParseError *outParseError, + UErrorCode &errorCode); + + const char *getErrorReason() const { return errorReason; } + +private: + friend class CEFinalizer; + + /** Implements CollationRuleParser::Sink. */ + virtual void addReset(int32_t strength, const UnicodeString &str, + const char *&errorReason, UErrorCode &errorCode); + /** + * Returns the secondary or tertiary weight preceding the current node's weight. + * node=nodes[index]. + */ + uint32_t getWeight16Before(int32_t index, int64_t node, int32_t level); + + int64_t getSpecialResetPosition(const UnicodeString &str, + const char *&parserErrorReason, UErrorCode &errorCode); + + /** Implements CollationRuleParser::Sink. */ + virtual void addRelation(int32_t strength, const UnicodeString &prefix, + const UnicodeString &str, const UnicodeString &extension, + const char *&errorReason, UErrorCode &errorCode); + + /** + * Picks one of the current CEs and finds or inserts a node in the graph + * for the CE + strength. + */ + int32_t findOrInsertNodeForCEs(int32_t strength, const char *&parserErrorReason, + UErrorCode &errorCode); + int32_t findOrInsertNodeForRootCE(int64_t ce, int32_t strength, UErrorCode &errorCode); + /** Finds or inserts the node for a root CE's primary weight. */ + int32_t findOrInsertNodeForPrimary(uint32_t p, UErrorCode &errorCode); + /** Finds or inserts the node for a secondary or tertiary weight. */ + int32_t findOrInsertWeakNode(int32_t index, uint32_t weight16, int32_t level, + UErrorCode &errorCode); + + /** + * Makes and inserts a new tailored node into the list, after the one at index. + * Skips over nodes of weaker strength to maintain collation order + * ("postpone insertion"). + * @return the new node's index + */ + int32_t insertTailoredNodeAfter(int32_t index, int32_t strength, UErrorCode &errorCode); + + /** + * Inserts a new node into the list, between list-adjacent items. + * The node's previous and next indexes must not be set yet. + * @return the new node's index + */ + int32_t insertNodeBetween(int32_t index, int32_t nextIndex, int64_t node, + UErrorCode &errorCode); + + /** + * Finds the node which implies or contains a common=05 weight of the given strength + * (secondary or tertiary), if the current node is stronger. + * Skips weaker nodes and tailored nodes if the current node is stronger + * and is followed by an explicit-common-weight node. + * Always returns the input index if that node is no stronger than the given strength. + */ + int32_t findCommonNode(int32_t index, int32_t strength) const; + + void setCaseBits(const UnicodeString &nfdString, + const char *&parserErrorReason, UErrorCode &errorCode); + + /** Implements CollationRuleParser::Sink. */ + virtual void suppressContractions(const UnicodeSet &set, const char *&parserErrorReason, + UErrorCode &errorCode); + + /** Implements CollationRuleParser::Sink. */ + virtual void optimize(const UnicodeSet &set, const char *&parserErrorReason, + UErrorCode &errorCode); + + /** + * Adds the mapping and its canonical closure. + * Takes ce32=dataBuilder->encodeCEs(...) so that the data builder + * need not re-encode the CEs multiple times. + */ + uint32_t addWithClosure(const UnicodeString &nfdPrefix, const UnicodeString &nfdString, + const int64_t newCEs[], int32_t newCEsLength, uint32_t ce32, + UErrorCode &errorCode); + uint32_t addOnlyClosure(const UnicodeString &nfdPrefix, const UnicodeString &nfdString, + const int64_t newCEs[], int32_t newCEsLength, uint32_t ce32, + UErrorCode &errorCode); + void addTailComposites(const UnicodeString &nfdPrefix, const UnicodeString &nfdString, + UErrorCode &errorCode); + UBool mergeCompositeIntoString(const UnicodeString &nfdString, int32_t indexAfterLastStarter, + UChar32 composite, const UnicodeString &decomp, + UnicodeString &newNFDString, UnicodeString &newString, + UErrorCode &errorCode) const; + + UBool ignorePrefix(const UnicodeString &s, UErrorCode &errorCode) const; + UBool ignoreString(const UnicodeString &s, UErrorCode &errorCode) const; + UBool isFCD(const UnicodeString &s, UErrorCode &errorCode) const; + + void closeOverComposites(UErrorCode &errorCode); + + uint32_t addIfDifferent(const UnicodeString &prefix, const UnicodeString &str, + const int64_t newCEs[], int32_t newCEsLength, uint32_t ce32, + UErrorCode &errorCode); + static UBool sameCEs(const int64_t ces1[], int32_t ces1Length, + const int64_t ces2[], int32_t ces2Length); + + /** + * Walks the tailoring graph and overwrites tailored nodes with new CEs. + * After this, the graph is destroyed. + * The nodes array can then be used only as a source of tailored CEs. + */ + void makeTailoredCEs(UErrorCode &errorCode); + /** + * Counts the tailored nodes of the given strength up to the next node + * which is either stronger or has an explicit weight of this strength. + */ + static int32_t countTailoredNodes(const int64_t *nodesArray, int32_t i, int32_t strength); + + /** Replaces temporary CEs with the final CEs they point to. */ + void finalizeCEs(UErrorCode &errorCode); + + /** + * Encodes "temporary CE" data into a CE that fits into the CE32 data structure, + * with 2-byte primary, 1-byte secondary and 6-bit tertiary, + * with valid CE byte values. + * + * The index must not exceed 20 bits (0xfffff). + * The strength must fit into 2 bits (UCOL_PRIMARY..UCOL_QUATERNARY). + * + * Temporary CEs are distinguished from real CEs by their use of + * secondary weights 06..45 which are otherwise reserved for compressed sort keys. + * + * The case bits are unused and available. + */ + static inline int64_t tempCEFromIndexAndStrength(int32_t index, int32_t strength) { + return + // CE byte offsets, to ensure valid CE bytes, and case bits 11 + INT64_C(0x4040000006002000) + + // index bits 19..13 -> primary byte 1 = CE bits 63..56 (byte values 40..BF) + ((int64_t)(index & 0xfe000) << 43) + + // index bits 12..6 -> primary byte 2 = CE bits 55..48 (byte values 40..BF) + ((int64_t)(index & 0x1fc0) << 42) + + // index bits 5..0 -> secondary byte 1 = CE bits 31..24 (byte values 06..45) + ((index & 0x3f) << 24) + + // strength bits 1..0 -> tertiary byte 1 = CE bits 13..8 (byte values 20..23) + (strength << 8); + } + static inline int32_t indexFromTempCE(int64_t tempCE) { + tempCE -= INT64_C(0x4040000006002000); + return + ((int32_t)(tempCE >> 43) & 0xfe000) | + ((int32_t)(tempCE >> 42) & 0x1fc0) | + ((int32_t)(tempCE >> 24) & 0x3f); + } + static inline int32_t strengthFromTempCE(int64_t tempCE) { + return ((int32_t)tempCE >> 8) & 3; + } + static inline UBool isTempCE(int64_t ce) { + uint32_t sec = (uint32_t)ce >> 24; + return 6 <= sec && sec <= 0x45; + } + + static inline int32_t indexFromTempCE32(uint32_t tempCE32) { + tempCE32 -= 0x40400620; + return + ((int32_t)(tempCE32 >> 11) & 0xfe000) | + ((int32_t)(tempCE32 >> 10) & 0x1fc0) | + ((int32_t)(tempCE32 >> 8) & 0x3f); + } + static inline UBool isTempCE32(uint32_t ce32) { + return + (ce32 & 0xff) >= 2 && // not a long-primary/long-secondary CE32 + 6 <= ((ce32 >> 8) & 0xff) && ((ce32 >> 8) & 0xff) <= 0x45; + } + + static int32_t ceStrength(int64_t ce); + + /** At most 1M nodes, limited by the 20 bits in node bit fields. */ + static const int32_t MAX_INDEX = 0xfffff; + /** + * Node bit 6 is set on a primary node if there are nodes + * with secondary values below the common secondary weight (05). + */ + static const int32_t HAS_BEFORE2 = 0x40; + /** + * Node bit 5 is set on a primary or secondary node if there are nodes + * with tertiary values below the common tertiary weight (05). + */ + static const int32_t HAS_BEFORE3 = 0x20; + /** + * Node bit 3 distinguishes a tailored node, which has no weight value, + * from a node with an explicit (root or default) weight. + */ + static const int32_t IS_TAILORED = 8; + + static inline int64_t nodeFromWeight32(uint32_t weight32) { + return (int64_t)weight32 << 32; + } + static inline int64_t nodeFromWeight16(uint32_t weight16) { + return (int64_t)weight16 << 48; + } + static inline int64_t nodeFromPreviousIndex(int32_t previous) { + return (int64_t)previous << 28; + } + static inline int64_t nodeFromNextIndex(int32_t next) { + return next << 8; + } + static inline int64_t nodeFromStrength(int32_t strength) { + return strength; + } + + static inline uint32_t weight32FromNode(int64_t node) { + return (uint32_t)(node >> 32); + } + static inline uint32_t weight16FromNode(int64_t node) { + return (uint32_t)(node >> 48) & 0xffff; + } + static inline int32_t previousIndexFromNode(int64_t node) { + return (int32_t)(node >> 28) & MAX_INDEX; + } + static inline int32_t nextIndexFromNode(int64_t node) { + return ((int32_t)node >> 8) & MAX_INDEX; + } + static inline int32_t strengthFromNode(int64_t node) { + return (int32_t)node & 3; + } + + static inline UBool nodeHasBefore2(int64_t node) { + return (node & HAS_BEFORE2) != 0; + } + static inline UBool nodeHasBefore3(int64_t node) { + return (node & HAS_BEFORE3) != 0; + } + static inline UBool nodeHasAnyBefore(int64_t node) { + return (node & (HAS_BEFORE2 | HAS_BEFORE3)) != 0; + } + static inline UBool isTailoredNode(int64_t node) { + return (node & IS_TAILORED) != 0; + } + + static inline int64_t changeNodePreviousIndex(int64_t node, int32_t previous) { + return (node & INT64_C(0xffff00000fffffff)) | nodeFromPreviousIndex(previous); + } + static inline int64_t changeNodeNextIndex(int64_t node, int32_t next) { + return (node & INT64_C(0xfffffffff00000ff)) | nodeFromNextIndex(next); + } + + const Normalizer2 &nfd, &fcd; + const Normalizer2Impl &nfcImpl; + + const CollationTailoring *base; + const CollationData *baseData; + const CollationRootElements rootElements; + uint32_t variableTop; + + CollationDataBuilder *dataBuilder; + UBool fastLatinEnabled; + UnicodeSet optimizeSet; + const char *errorReason; + + int64_t ces[Collation::MAX_EXPANSION_LENGTH]; + int32_t cesLength; + + /** + * Indexes of nodes with root primary weights, sorted by primary. + * Compact form of a TreeMap from root primary to node index. + * + * This is a performance optimization for finding reset positions. + * Without this, we would have to search through the entire nodes list. + * It also allows storing root primary weights in list head nodes, + * without previous index, leaving room in root primary nodes for 32-bit primary weights. + */ + UVector32 rootPrimaryIndexes; + /** + * Data structure for assigning tailored weights and CEs. + * Doubly-linked lists of nodes in mostly collation order. + * Each list starts with a root primary node and ends with a nextIndex of 0. + * + * When there are any nodes in the list, then there is always a root primary node at index 0. + * This allows some code not to have to check explicitly for nextIndex==0. + * + * Root primary nodes have 32-bit weights but do not have previous indexes. + * All other nodes have at most 16-bit weights and do have previous indexes. + * + * Nodes with explicit weights store root collator weights, + * or default weak weights (e.g., secondary 05) for stronger nodes. + * "Tailored" nodes, with the IS_TAILORED bit set, + * do not store explicit weights but rather + * create a difference of a certain strength from the preceding node. + * + * A root node is followed by either + * - a root/default node of the same strength, or + * - a root/default node of the next-weaker strength, or + * - a tailored node of the same strength. + * + * A node of a given strength normally implies "common" weights on weaker levels. + * + * A node with HAS_BEFORE2 must be immediately followed by + * a secondary node with an explicit below-common weight, then a secondary tailored node, + * and later an explicit common-secondary node. + * The below-common weight can be a root weight, + * or it can be BEFORE_WEIGHT16 for tailoring before an implied common weight + * or before the lowest root weight. + * (&[before 2] resets to an explicit secondary node so that + * the following addRelation(secondary) tailors right after that. + * If we did not have this node and instead were to reset on the primary node, + * then addRelation(secondary) would skip forward to the the COMMON_WEIGHT16 node.) + * + * If the flag is not set, then there are no explicit secondary nodes + * with the common or lower weights. + * + * Same for HAS_BEFORE3 for tertiary nodes and weights. + * A node must not have both flags set. + * + * Tailored CEs are initially represented in a CollationDataBuilder as temporary CEs + * which point to stable indexes in this list, + * and temporary CEs stored in a CollationDataBuilder only point to tailored nodes. + * + * A temporary CE in the ces[] array may point to a non-tailored reset-before-position node, + * until the next relation is added. + * + * At the end, the tailored weights are allocated as necessary, + * then the tailored nodes are replaced with final CEs, + * and the CollationData is rewritten by replacing temporary CEs with final ones. + * + * We cannot simply insert new nodes in the middle of the array + * because that would invalidate the indexes stored in existing temporary CEs. + * We need to use a linked graph with stable indexes to existing nodes. + * A doubly-linked list seems easiest to maintain. + * + * Each node is stored as an int64_t, with its fields stored as bit fields. + * + * Root primary node: + * - primary weight: 32 bits 63..32 + * - reserved/unused/zero: 4 bits 31..28 + * + * Weaker root nodes & tailored nodes: + * - a weight: 16 bits 63..48 + * + a root or default weight for a non-tailored node + * + unused/zero for a tailored node + * - index to the previous node: 20 bits 47..28 + * + * All types of nodes: + * - index to the next node: 20 bits 27..8 + * + nextIndex=0 in last node per root-primary list + * - reserved/unused/zero bits: bits 7, 4, 2 + * - HAS_BEFORE2: bit 6 + * - HAS_BEFORE3: bit 5 + * - IS_TAILORED: bit 3 + * - the difference strength (primary/secondary/tertiary/quaternary): 2 bits 1..0 + * + * We could allocate structs with pointers, but we would have to store them + * in a pointer list so that they can be indexed from temporary CEs, + * and they would require more memory allocations. + */ + UVector64 nodes; +}; + +U_NAMESPACE_END + +#endif // !UCONFIG_NO_COLLATION +#endif // __COLLATIONBUILDER_H__ |