Update ICU to 54.1 step 1

source/i18n/collation.h

Index: source/i18n/collation.h
diff --git a/source/i18n/collation.h b/source/i18n/collation.h
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+/*
+*******************************************************************************
+* Copyright (C) 2010-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collation.h
+*
+* created on: 2010oct27
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATION_H__
+#define __COLLATION_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Collation v2 basic definitions and static helper functions.
+ *
+ * Data structures except for expansion tables store 32-bit CEs which are
+ * either specials (see tags below) or are compact forms of 64-bit CEs.
+ */
+class U_I18N_API Collation {
+public:
+    // Special sort key bytes for all levels.
+    static const uint8_t TERMINATOR_BYTE = 0;
+    static const uint8_t LEVEL_SEPARATOR_BYTE = 1;
+    /**
+     * Merge-sort-key separator.
+     * Must not be used as the lead byte of any CE weight,
+     * nor as primary compression low terminator.
+     * Otherwise usable.
+     */
+    static const uint8_t MERGE_SEPARATOR_BYTE = 2;
+    static const uint32_t MERGE_SEPARATOR_PRIMARY = 0x02000000;  // U+FFFE
+    static const uint32_t MERGE_SEPARATOR_WEIGHT16 = 0x0200;  // U+FFFE
+    static const uint32_t MERGE_SEPARATOR_LOWER32 = 0x02000200;  // U+FFFE
+    static const uint32_t MERGE_SEPARATOR_CE32 = 0x02000202;  // U+FFFE
+
+    /**
+     * Primary compression low terminator, must be greater than MERGE_SEPARATOR_BYTE.
+     * Reserved value in primary second byte if the lead byte is compressible.
+     * Otherwise usable in all CE weight bytes.
+     */
+    static const uint8_t PRIMARY_COMPRESSION_LOW_BYTE = 3;
+    /**
+     * Primary compression high terminator.
+     * Reserved value in primary second byte if the lead byte is compressible.
+     * Otherwise usable in all CE weight bytes.
+     */
+    static const uint8_t PRIMARY_COMPRESSION_HIGH_BYTE = 0xff;
+
+    /** Default secondary/tertiary weight lead byte. */
+    static const uint8_t COMMON_BYTE = 5;
+    static const uint32_t COMMON_WEIGHT16 = 0x0500;
+    /** Middle 16 bits of a CE with a common secondary weight. */
+    static const uint32_t COMMON_SECONDARY_CE = 0x05000000;
+    /** Lower 16 bits of a CE with a common tertiary weight. */
+    static const uint32_t COMMON_TERTIARY_CE = 0x0500;
+    /** Lower 32 bits of a CE with common secondary and tertiary weights. */
+    static const uint32_t COMMON_SEC_AND_TER_CE = 0x05000500;
+
+    static const uint32_t SECONDARY_MASK = 0xffff0000;
+    static const uint32_t CASE_MASK = 0xc000;
+    static const uint32_t SECONDARY_AND_CASE_MASK = SECONDARY_MASK | CASE_MASK;
+    /** Only the 2*6 bits for the pure tertiary weight. */
+    static const uint32_t ONLY_TERTIARY_MASK = 0x3f3f;
+    /** Only the secondary & tertiary bits; no case, no quaternary. */
+    static const uint32_t ONLY_SEC_TER_MASK = SECONDARY_MASK | ONLY_TERTIARY_MASK;
+    /** Case bits and tertiary bits. */
+    static const uint32_t CASE_AND_TERTIARY_MASK = CASE_MASK | ONLY_TERTIARY_MASK;
+    static const uint32_t QUATERNARY_MASK = 0xc0;
+    /** Case bits and quaternary bits. */
+    static const uint32_t CASE_AND_QUATERNARY_MASK = CASE_MASK | QUATERNARY_MASK;
+
+    static const uint8_t UNASSIGNED_IMPLICIT_BYTE = 0xfe;  // compressible
+    /**
+     * First unassigned: AlphabeticIndex overflow boundary.
+     * We want a 3-byte primary so that it fits into the root elements table.
+     *
+     * This 3-byte primary will not collide with
+     * any unassigned-implicit 4-byte primaries because
+     * the first few hundred Unicode code points all have real mappings.
+     */
+    static const uint32_t FIRST_UNASSIGNED_PRIMARY = 0xfe040200;
+
+    static const uint8_t TRAIL_WEIGHT_BYTE = 0xff;  // not compressible
+    static const uint32_t FIRST_TRAILING_PRIMARY = 0xff020200;  // [first trailing]
+    static const uint32_t MAX_PRIMARY = 0xffff0000;  // U+FFFF
+    static const uint32_t MAX_REGULAR_CE32 = 0xffff0505;  // U+FFFF
+
+    // CE32 value for U+FFFD as well as illegal UTF-8 byte sequences (which behave like U+FFFD).
+    // We use the third-highest primary weight for U+FFFD (as in UCA 6.3+).
+    static const uint32_t FFFD_PRIMARY = MAX_PRIMARY - 0x20000;
+    static const uint32_t FFFD_CE32 = MAX_REGULAR_CE32 - 0x20000;
+
+    /**
+     * A CE32 is special if its low byte is this or greater.
+     * Impossible case bits 11 mark special CE32s.
+     * This value itself is used to indicate a fallback to the base collator.
+     */
+    static const uint8_t SPECIAL_CE32_LOW_BYTE = 0xc0;
+    static const uint32_t FALLBACK_CE32 = SPECIAL_CE32_LOW_BYTE;
+    /**
+     * Low byte of a long-primary special CE32.
+     */
+    static const uint8_t LONG_PRIMARY_CE32_LOW_BYTE = 0xc1;  // SPECIAL_CE32_LOW_BYTE | LONG_PRIMARY_TAG
+
+    static const uint32_t UNASSIGNED_CE32 = 0xffffffff;  // Compute an unassigned-implicit CE.
+
+    static const uint32_t NO_CE32 = 1;
+
+    /** No CE: End of input. Only used in runtime code, not stored in data. */
+    static const uint32_t NO_CE_PRIMARY = 1;  // not a left-adjusted weight
+    static const uint32_t NO_CE_WEIGHT16 = 0x0100;  // weight of LEVEL_SEPARATOR_BYTE
+    static const int64_t NO_CE = INT64_C(0x101000100);  // NO_CE_PRIMARY, NO_CE_WEIGHT16, NO_CE_WEIGHT16
+
+    /** Sort key levels. */
+    enum Level {
+        /** Unspecified level. */
+        NO_LEVEL,
+        PRIMARY_LEVEL,
+        SECONDARY_LEVEL,
+        CASE_LEVEL,
+        TERTIARY_LEVEL,
+        QUATERNARY_LEVEL,
+        IDENTICAL_LEVEL,
+        /** Beyond sort key bytes. */
+        ZERO_LEVEL
+    };
+
+    /**
+     * Sort key level flags: xx_FLAG = 1 << xx_LEVEL.
+     * In Java, use enum Level with flag() getters, or use EnumSet rather than hand-made bit sets.
+     */
+    static const uint32_t NO_LEVEL_FLAG = 1;
+    static const uint32_t PRIMARY_LEVEL_FLAG = 2;
+    static const uint32_t SECONDARY_LEVEL_FLAG = 4;
+    static const uint32_t CASE_LEVEL_FLAG = 8;
+    static const uint32_t TERTIARY_LEVEL_FLAG = 0x10;
+    static const uint32_t QUATERNARY_LEVEL_FLAG = 0x20;
+    static const uint32_t IDENTICAL_LEVEL_FLAG = 0x40;
+    static const uint32_t ZERO_LEVEL_FLAG = 0x80;
+
+    /**
+     * Special-CE32 tags, from bits 3..0 of a special 32-bit CE.
+     * Bits 31..8 are available for tag-specific data.
+     * Bits  5..4: Reserved. May be used in the future to indicate lccc!=0 and tccc!=0.
+     */
+    enum {
+        /**
+         * Fall back to the base collator.
+         * This is the tag value in SPECIAL_CE32_LOW_BYTE and FALLBACK_CE32.
+         * Bits 31..8: Unused, 0.
+         */
+        FALLBACK_TAG = 0,
+        /**
+         * Long-primary CE with COMMON_SEC_AND_TER_CE.
+         * Bits 31..8: Three-byte primary.
+         */
+        LONG_PRIMARY_TAG = 1,
+        /**
+         * Long-secondary CE with zero primary.
+         * Bits 31..16: Secondary weight.
+         * Bits 15.. 8: Tertiary weight.
+         */
+        LONG_SECONDARY_TAG = 2,
+        /**
+         * Unused.
+         * May be used in the future for single-byte secondary CEs (SHORT_SECONDARY_TAG),
+         * storing the secondary in bits 31..24, the ccc in bits 23..16,
+         * and the tertiary in bits 15..8.
+         */
+        RESERVED_TAG_3 = 3,
+        /**
+         * Latin mini expansions of two simple CEs [pp, 05, tt] [00, ss, 05].
+         * Bits 31..24: Single-byte primary weight pp of the first CE.
+         * Bits 23..16: Tertiary weight tt of the first CE.
+         * Bits 15.. 8: Secondary weight ss of the second CE.
+         */
+        LATIN_EXPANSION_TAG = 4,
+        /**
+         * Points to one or more simple/long-primary/long-secondary 32-bit CE32s.
+         * Bits 31..13: Index into uint32_t table.
+         * Bits 12.. 8: Length=1..31.
+         */
+        EXPANSION32_TAG = 5,
+        /**
+         * Points to one or more 64-bit CEs.
+         * Bits 31..13: Index into CE table.
+         * Bits 12.. 8: Length=1..31.
+         */
+        EXPANSION_TAG = 6,
+        /**
+         * Builder data, used only in the CollationDataBuilder, not in runtime data.
+         *
+         * If bit 8 is 0: Builder context, points to a list of context-sensitive mappings.
+         * Bits 31..13: Index to the builder's list of ConditionalCE32 for this character.
+         * Bits 12.. 9: Unused, 0.
+         *
+         * If bit 8 is 1 (IS_BUILDER_JAMO_CE32): Builder-only jamoCE32 value.
+         * The builder fetches the Jamo CE32 from the trie.
+         * Bits 31..13: Jamo code point.
+         * Bits 12.. 9: Unused, 0.
+         */
+        BUILDER_DATA_TAG = 7,
+        /**
+         * Points to prefix trie.
+         * Bits 31..13: Index into prefix/contraction data.
+         * Bits 12.. 8: Unused, 0.
+         */
+        PREFIX_TAG = 8,
+        /**
+         * Points to contraction data.
+         * Bits 31..13: Index into prefix/contraction data.
+         * Bits 12..11: Unused, 0.
+         * Bit      10: CONTRACT_TRAILING_CCC flag.
+         * Bit       9: CONTRACT_NEXT_CCC flag.
+         * Bit       8: CONTRACT_SINGLE_CP_NO_MATCH flag.
+         */
+        CONTRACTION_TAG = 9,
+        /**
+         * Decimal digit.
+         * Bits 31..13: Index into uint32_t table for non-numeric-collation CE32.
+         * Bit      12: Unused, 0.
+         * Bits 11.. 8: Digit value 0..9.
+         */
+        DIGIT_TAG = 10,
+        /**
+         * Tag for U+0000, for moving the NUL-termination handling
+         * from the regular fastpath into specials-handling code.
+         * Bits 31..8: Unused, 0.
+         */
+        U0000_TAG = 11,
+        /**
+         * Tag for a Hangul syllable.
+         * Bits 31..9: Unused, 0.
+         * Bit      8: HANGUL_NO_SPECIAL_JAMO flag.
+         */
+        HANGUL_TAG = 12,
+        /**
+         * Tag for a lead surrogate code unit.
+         * Optional optimization for UTF-16 string processing.
+         * Bits 31..10: Unused, 0.
+         *       9.. 8: =0: All associated supplementary code points are unassigned-implict.
+         *              =1: All associated supplementary code points fall back to the base data.
+         *              else: (Normally 2) Look up the data for the supplementary code point.
+         */
+        LEAD_SURROGATE_TAG = 13,
+        /**
+         * Tag for CEs with primary weights in code point order.
+         * Bits 31..13: Index into CE table, for one data "CE".
+         * Bits 12.. 8: Unused, 0.
+         *
+         * This data "CE" has the following bit fields:
+         * Bits 63..32: Three-byte primary pppppp00.
+         *      31.. 8: Start/base code point of the in-order range.
+         *           7: Flag isCompressible primary.
+         *       6.. 0: Per-code point primary-weight increment.
+         */
+        OFFSET_TAG = 14,
+        /**
+         * Implicit CE tag. Compute an unassigned-implicit CE.
+         * All bits are set (UNASSIGNED_CE32=0xffffffff).
+         */
+        IMPLICIT_TAG = 15
+    };
+
+    static UBool isAssignedCE32(uint32_t ce32) {
+        return ce32 != FALLBACK_CE32 && ce32 != UNASSIGNED_CE32;
+    }
+
+    /**
+     * We limit the number of CEs in an expansion
+     * so that we can use a small number of length bits in the data structure,
+     * and so that an implementation can copy CEs at runtime without growing a destination buffer.
+     */
+    static const int32_t MAX_EXPANSION_LENGTH = 31;
+    static const int32_t MAX_INDEX = 0x7ffff;
+
+    /**
+     * Set if there is no match for the single (no-suffix) character itself.
+     * This is only possible if there is a prefix.
+     * In this case, discontiguous contraction matching cannot add combining marks
+     * starting from an empty suffix.
+     * The default CE32 is used anyway if there is no suffix match.
+     */
+    static const uint32_t CONTRACT_SINGLE_CP_NO_MATCH = 0x100;
+    /** Set if the first character of every contraction suffix has lccc!=0. */
+    static const uint32_t CONTRACT_NEXT_CCC = 0x200;
+    /** Set if any contraction suffix ends with lccc!=0. */
+    static const uint32_t CONTRACT_TRAILING_CCC = 0x400;
+
+    /** For HANGUL_TAG: None of its Jamo CE32s isSpecialCE32(). */
+    static const uint32_t HANGUL_NO_SPECIAL_JAMO = 0x100;
+
+    static const uint32_t LEAD_ALL_UNASSIGNED = 0;
+    static const uint32_t LEAD_ALL_FALLBACK = 0x100;
+    static const uint32_t LEAD_MIXED = 0x200;
+    static const uint32_t LEAD_TYPE_MASK = 0x300;
+
+    static uint32_t makeLongPrimaryCE32(uint32_t p) { return p | LONG_PRIMARY_CE32_LOW_BYTE; }
+
+    /** Turns the long-primary CE32 into a primary weight pppppp00. */
+    static inline uint32_t primaryFromLongPrimaryCE32(uint32_t ce32) {
+        return ce32 & 0xffffff00;
+    }
+    static inline int64_t ceFromLongPrimaryCE32(uint32_t ce32) {
+        return ((int64_t)(ce32 & 0xffffff00) << 32) | COMMON_SEC_AND_TER_CE;
+    }
+
+    static uint32_t makeLongSecondaryCE32(uint32_t lower32) {
+        return lower32 | SPECIAL_CE32_LOW_BYTE | LONG_SECONDARY_TAG;
+    }
+    static inline int64_t ceFromLongSecondaryCE32(uint32_t ce32) {
+        return ce32 & 0xffffff00;
+    }
+
+    /** Makes a special CE32 with tag, index and length. */
+    static uint32_t makeCE32FromTagIndexAndLength(int32_t tag, int32_t index, int32_t length) {
+        return (index << 13) | (length << 8) | SPECIAL_CE32_LOW_BYTE | tag;
+    }
+    /** Makes a special CE32 with only tag and index. */
+    static uint32_t makeCE32FromTagAndIndex(int32_t tag, int32_t index) {
+        return (index << 13) | SPECIAL_CE32_LOW_BYTE | tag;
+    }
+
+    static inline UBool isSpecialCE32(uint32_t ce32) {
+        return (ce32 & 0xff) >= SPECIAL_CE32_LOW_BYTE;
+    }
+
+    static inline int32_t tagFromCE32(uint32_t ce32) {
+        return (int32_t)(ce32 & 0xf);
+    }
+
+    static inline UBool hasCE32Tag(uint32_t ce32, int32_t tag) {
+        return isSpecialCE32(ce32) && tagFromCE32(ce32) == tag;
+    }
+
+    static inline UBool isLongPrimaryCE32(uint32_t ce32) {
+        return hasCE32Tag(ce32, LONG_PRIMARY_TAG);
+    }
+
+    static UBool isSimpleOrLongCE32(uint32_t ce32) {
+        return !isSpecialCE32(ce32) ||
+                tagFromCE32(ce32) == LONG_PRIMARY_TAG ||
+                tagFromCE32(ce32) == LONG_SECONDARY_TAG;
+    }
+
+    /**
+     * @return TRUE if the ce32 yields one or more CEs without further data lookups
+     */
+    static UBool isSelfContainedCE32(uint32_t ce32) {
+        return !isSpecialCE32(ce32) ||
+                tagFromCE32(ce32) == LONG_PRIMARY_TAG ||
+                tagFromCE32(ce32) == LONG_SECONDARY_TAG ||
+                tagFromCE32(ce32) == LATIN_EXPANSION_TAG;
+    }
+
+    static inline UBool isPrefixCE32(uint32_t ce32) {
+        return hasCE32Tag(ce32, PREFIX_TAG);
+    }
+
+    static inline UBool isContractionCE32(uint32_t ce32) {
+        return hasCE32Tag(ce32, CONTRACTION_TAG);
+    }
+
+    static inline UBool ce32HasContext(uint32_t ce32) {
+        return isSpecialCE32(ce32) &&
+                (tagFromCE32(ce32) == PREFIX_TAG ||
+                tagFromCE32(ce32) == CONTRACTION_TAG);
+    }
+
+    /**
+     * Get the first of the two Latin-expansion CEs encoded in ce32.
+     * @see LATIN_EXPANSION_TAG
+     */
+    static inline int64_t latinCE0FromCE32(uint32_t ce32) {
+        return ((int64_t)(ce32 & 0xff000000) << 32) | COMMON_SECONDARY_CE | ((ce32 & 0xff0000) >> 8);
+    }
+
+    /**
+     * Get the second of the two Latin-expansion CEs encoded in ce32.
+     * @see LATIN_EXPANSION_TAG
+     */
+    static inline int64_t latinCE1FromCE32(uint32_t ce32) {
+        return ((ce32 & 0xff00) << 16) | COMMON_TERTIARY_CE;
+    }
+
+    /**
+     * Returns the data index from a special CE32.
+     */
+    static inline int32_t indexFromCE32(uint32_t ce32) {
+        return (int32_t)(ce32 >> 13);
+    }
+
+    /**
+     * Returns the data length from a ce32.
+     */
+    static inline int32_t lengthFromCE32(uint32_t ce32) {
+        return (ce32 >> 8) & 31;
+    }
+
+    /**
+     * Returns the digit value from a DIGIT_TAG ce32.
+     */
+    static inline char digitFromCE32(uint32_t ce32) {
+        return (char)((ce32 >> 8) & 0xf);
+    }
+
+    /** Returns a 64-bit CE from a simple CE32 (not special). */
+    static inline int64_t ceFromSimpleCE32(uint32_t ce32) {
+        // normal form ppppsstt -> pppp0000ss00tt00
+        // assert (ce32 & 0xff) < SPECIAL_CE32_LOW_BYTE
+        return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | ((ce32 & 0xff) << 8);
+    }
+
+    /** Returns a 64-bit CE from a simple/long-primary/long-secondary CE32. */
+    static inline int64_t ceFromCE32(uint32_t ce32) {
+        uint32_t tertiary = ce32 & 0xff;
+        if(tertiary < SPECIAL_CE32_LOW_BYTE) {
+            // normal form ppppsstt -> pppp0000ss00tt00
+            return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | (tertiary << 8);
+        } else {
+            ce32 -= tertiary;
+            if((tertiary & 0xf) == LONG_PRIMARY_TAG) {
+                // long-primary form ppppppC1 -> pppppp00050000500
+                return ((int64_t)ce32 << 32) | COMMON_SEC_AND_TER_CE;
+            } else {
+                // long-secondary form ssssttC2 -> 00000000sssstt00
+                // assert (tertiary & 0xf) == LONG_SECONDARY_TAG
+                return ce32;
+            }
+        }
+    }
+
+    /** Creates a CE from a primary weight. */
+    static inline int64_t makeCE(uint32_t p) {
+        return ((int64_t)p << 32) | COMMON_SEC_AND_TER_CE;
+    }
+    /**
+     * Creates a CE from a primary weight,
+     * 16-bit secondary/tertiary weights, and a 2-bit quaternary.
+     */
+    static inline int64_t makeCE(uint32_t p, uint32_t s, uint32_t t, uint32_t q) {
+        return ((int64_t)p << 32) | (s << 16) | t | (q << 6);
+    }
+
+    /**
+     * Increments a 2-byte primary by a code point offset.
+     */
+    static uint32_t incTwoBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible,
+                                              int32_t offset);
+
+    /**
+     * Increments a 3-byte primary by a code point offset.
+     */
+    static uint32_t incThreeBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible,
+                                                int32_t offset);
+
+    /**
+     * Decrements a 2-byte primary by one range step (1..0x7f).
+     */
+    static uint32_t decTwoBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step);
+
+    /**
+     * Decrements a 3-byte primary by one range step (1..0x7f).
+     */
+    static uint32_t decThreeBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step);
+
+    /**
+     * Computes a 3-byte primary for c's OFFSET_TAG data "CE".
+     */
+    static uint32_t getThreeBytePrimaryForOffsetData(UChar32 c, int64_t dataCE);
+
+    /**
+     * Returns the unassigned-character implicit primary weight for any valid code point c.
+     */
+    static uint32_t unassignedPrimaryFromCodePoint(UChar32 c);
+
+    static inline int64_t unassignedCEFromCodePoint(UChar32 c) {
+        return makeCE(unassignedPrimaryFromCodePoint(c));
+    }
+
+    static inline uint32_t reorder(const uint8_t reorderTable[256], uint32_t primary) {
+        return ((uint32_t)reorderTable[primary >> 24] << 24) | (primary & 0xffffff);
+    }
+
+private:
+    Collation();  // No instantiation.
+};
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATION_H__