Update ICU to 54.1 step 1

source/i18n/collationbuilder.h

+/*
+*******************************************************************************
+* 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);
+
+    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).
+     * 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);
+
+    /** The secondary/tertiary lower limit for tailoring before the common weight. */
+    static const uint32_t BEFORE_WEIGHT16 = Collation::MERGE_SEPARATOR_WEIGHT16;
+
+    /** 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 tailored nodes
+     * with secondary values below the common secondary weight (05),
+     * from a reset-secondary-before (&[before 2]).
+     */
+    static const int32_t HAS_BEFORE2 = 0x40;
+    /**
+     * Node bit 5 is set on a primary or secondary node if there are tailored nodes
+     * with tertiary values below the common tertiary weight (05),
+     * from a reset-tertiary-before (&[before 3]).
+     */
+    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 BEFORE_WEIGHT16, then a secondary tailored node,
+     * and later an explicit common-secondary node.
+     * (&[before 2] resets to the BEFORE_WEIGHT16 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.)
+     *
+     * All secondary tailored nodes between these two explicit ones
+     * will be assigned lower-than-common secondary weights.
+     * 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__