499 lines
18 KiB
C++
499 lines
18 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2010-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* collation.h
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*
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* created on: 2010oct27
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* created by: Markus W. Scherer
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*/
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#ifndef __COLLATION_H__
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#define __COLLATION_H__
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_COLLATION
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U_NAMESPACE_BEGIN
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/**
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* Collation v2 basic definitions and static helper functions.
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*
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* Data structures except for expansion tables store 32-bit CEs which are
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* either specials (see tags below) or are compact forms of 64-bit CEs.
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*/
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class U_I18N_API Collation {
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public:
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// Special sort key bytes for all levels.
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static const uint8_t TERMINATOR_BYTE = 0;
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static const uint8_t LEVEL_SEPARATOR_BYTE = 1;
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/** The secondary/tertiary lower limit for tailoring before any root elements. */
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static const uint32_t BEFORE_WEIGHT16 = 0x0100;
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/**
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* Merge-sort-key separator.
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* Same as the unique primary and identical-level weights of U+FFFE.
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* Must not be used as primary compression low terminator.
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* Otherwise usable.
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*/
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static const uint8_t MERGE_SEPARATOR_BYTE = 2;
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static const uint32_t MERGE_SEPARATOR_PRIMARY = 0x02000000; // U+FFFE
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static const uint32_t MERGE_SEPARATOR_CE32 = 0x02000505; // U+FFFE
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/**
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* Primary compression low terminator, must be greater than MERGE_SEPARATOR_BYTE.
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* Reserved value in primary second byte if the lead byte is compressible.
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* Otherwise usable in all CE weight bytes.
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*/
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static const uint8_t PRIMARY_COMPRESSION_LOW_BYTE = 3;
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/**
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* Primary compression high terminator.
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* Reserved value in primary second byte if the lead byte is compressible.
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* Otherwise usable in all CE weight bytes.
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*/
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static const uint8_t PRIMARY_COMPRESSION_HIGH_BYTE = 0xff;
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/** Default secondary/tertiary weight lead byte. */
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static const uint8_t COMMON_BYTE = 5;
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static const uint32_t COMMON_WEIGHT16 = 0x0500;
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/** Middle 16 bits of a CE with a common secondary weight. */
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static const uint32_t COMMON_SECONDARY_CE = 0x05000000;
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/** Lower 16 bits of a CE with a common tertiary weight. */
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static const uint32_t COMMON_TERTIARY_CE = 0x0500;
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/** Lower 32 bits of a CE with common secondary and tertiary weights. */
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static const uint32_t COMMON_SEC_AND_TER_CE = 0x05000500;
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static const uint32_t SECONDARY_MASK = 0xffff0000;
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static const uint32_t CASE_MASK = 0xc000;
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static const uint32_t SECONDARY_AND_CASE_MASK = SECONDARY_MASK | CASE_MASK;
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/** Only the 2*6 bits for the pure tertiary weight. */
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static const uint32_t ONLY_TERTIARY_MASK = 0x3f3f;
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/** Only the secondary & tertiary bits; no case, no quaternary. */
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static const uint32_t ONLY_SEC_TER_MASK = SECONDARY_MASK | ONLY_TERTIARY_MASK;
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/** Case bits and tertiary bits. */
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static const uint32_t CASE_AND_TERTIARY_MASK = CASE_MASK | ONLY_TERTIARY_MASK;
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static const uint32_t QUATERNARY_MASK = 0xc0;
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/** Case bits and quaternary bits. */
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static const uint32_t CASE_AND_QUATERNARY_MASK = CASE_MASK | QUATERNARY_MASK;
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static const uint8_t UNASSIGNED_IMPLICIT_BYTE = 0xfe; // compressible
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/**
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* First unassigned: AlphabeticIndex overflow boundary.
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* We want a 3-byte primary so that it fits into the root elements table.
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*
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* This 3-byte primary will not collide with
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* any unassigned-implicit 4-byte primaries because
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* the first few hundred Unicode code points all have real mappings.
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*/
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static const uint32_t FIRST_UNASSIGNED_PRIMARY = 0xfe040200;
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static const uint8_t TRAIL_WEIGHT_BYTE = 0xff; // not compressible
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static const uint32_t FIRST_TRAILING_PRIMARY = 0xff020200; // [first trailing]
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static const uint32_t MAX_PRIMARY = 0xffff0000; // U+FFFF
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static const uint32_t MAX_REGULAR_CE32 = 0xffff0505; // U+FFFF
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// CE32 value for U+FFFD as well as illegal UTF-8 byte sequences (which behave like U+FFFD).
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// We use the third-highest primary weight for U+FFFD (as in UCA 6.3+).
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static const uint32_t FFFD_PRIMARY = MAX_PRIMARY - 0x20000;
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static const uint32_t FFFD_CE32 = MAX_REGULAR_CE32 - 0x20000;
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/**
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* A CE32 is special if its low byte is this or greater.
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* Impossible case bits 11 mark special CE32s.
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* This value itself is used to indicate a fallback to the base collator.
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*/
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static const uint8_t SPECIAL_CE32_LOW_BYTE = 0xc0;
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static const uint32_t FALLBACK_CE32 = SPECIAL_CE32_LOW_BYTE;
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/**
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* Low byte of a long-primary special CE32.
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*/
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static const uint8_t LONG_PRIMARY_CE32_LOW_BYTE = 0xc1; // SPECIAL_CE32_LOW_BYTE | LONG_PRIMARY_TAG
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static const uint32_t UNASSIGNED_CE32 = 0xffffffff; // Compute an unassigned-implicit CE.
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static const uint32_t NO_CE32 = 1;
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/** No CE: End of input. Only used in runtime code, not stored in data. */
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static const uint32_t NO_CE_PRIMARY = 1; // not a left-adjusted weight
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static const uint32_t NO_CE_WEIGHT16 = 0x0100; // weight of LEVEL_SEPARATOR_BYTE
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static const int64_t NO_CE = INT64_C(0x101000100); // NO_CE_PRIMARY, NO_CE_WEIGHT16, NO_CE_WEIGHT16
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/** Sort key levels. */
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enum Level {
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/** Unspecified level. */
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NO_LEVEL,
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PRIMARY_LEVEL,
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SECONDARY_LEVEL,
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CASE_LEVEL,
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TERTIARY_LEVEL,
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QUATERNARY_LEVEL,
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IDENTICAL_LEVEL,
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/** Beyond sort key bytes. */
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ZERO_LEVEL
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};
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/**
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* Sort key level flags: xx_FLAG = 1 << xx_LEVEL.
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* In Java, use enum Level with flag() getters, or use EnumSet rather than hand-made bit sets.
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*/
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static const uint32_t NO_LEVEL_FLAG = 1;
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static const uint32_t PRIMARY_LEVEL_FLAG = 2;
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static const uint32_t SECONDARY_LEVEL_FLAG = 4;
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static const uint32_t CASE_LEVEL_FLAG = 8;
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static const uint32_t TERTIARY_LEVEL_FLAG = 0x10;
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static const uint32_t QUATERNARY_LEVEL_FLAG = 0x20;
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static const uint32_t IDENTICAL_LEVEL_FLAG = 0x40;
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static const uint32_t ZERO_LEVEL_FLAG = 0x80;
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/**
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* Special-CE32 tags, from bits 3..0 of a special 32-bit CE.
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* Bits 31..8 are available for tag-specific data.
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* Bits 5..4: Reserved. May be used in the future to indicate lccc!=0 and tccc!=0.
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*/
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enum {
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/**
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* Fall back to the base collator.
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* This is the tag value in SPECIAL_CE32_LOW_BYTE and FALLBACK_CE32.
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* Bits 31..8: Unused, 0.
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*/
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FALLBACK_TAG = 0,
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/**
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* Long-primary CE with COMMON_SEC_AND_TER_CE.
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* Bits 31..8: Three-byte primary.
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*/
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LONG_PRIMARY_TAG = 1,
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/**
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* Long-secondary CE with zero primary.
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* Bits 31..16: Secondary weight.
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* Bits 15.. 8: Tertiary weight.
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*/
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LONG_SECONDARY_TAG = 2,
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/**
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* Unused.
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* May be used in the future for single-byte secondary CEs (SHORT_SECONDARY_TAG),
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* storing the secondary in bits 31..24, the ccc in bits 23..16,
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* and the tertiary in bits 15..8.
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*/
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RESERVED_TAG_3 = 3,
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/**
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* Latin mini expansions of two simple CEs [pp, 05, tt] [00, ss, 05].
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* Bits 31..24: Single-byte primary weight pp of the first CE.
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* Bits 23..16: Tertiary weight tt of the first CE.
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* Bits 15.. 8: Secondary weight ss of the second CE.
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*/
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LATIN_EXPANSION_TAG = 4,
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/**
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* Points to one or more simple/long-primary/long-secondary 32-bit CE32s.
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* Bits 31..13: Index into uint32_t table.
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* Bits 12.. 8: Length=1..31.
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*/
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EXPANSION32_TAG = 5,
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/**
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* Points to one or more 64-bit CEs.
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* Bits 31..13: Index into CE table.
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* Bits 12.. 8: Length=1..31.
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*/
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EXPANSION_TAG = 6,
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/**
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* Builder data, used only in the CollationDataBuilder, not in runtime data.
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*
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* If bit 8 is 0: Builder context, points to a list of context-sensitive mappings.
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* Bits 31..13: Index to the builder's list of ConditionalCE32 for this character.
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* Bits 12.. 9: Unused, 0.
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*
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* If bit 8 is 1 (IS_BUILDER_JAMO_CE32): Builder-only jamoCE32 value.
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* The builder fetches the Jamo CE32 from the trie.
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* Bits 31..13: Jamo code point.
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* Bits 12.. 9: Unused, 0.
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*/
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BUILDER_DATA_TAG = 7,
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/**
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* Points to prefix trie.
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* Bits 31..13: Index into prefix/contraction data.
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* Bits 12.. 8: Unused, 0.
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*/
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PREFIX_TAG = 8,
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/**
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* Points to contraction data.
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* Bits 31..13: Index into prefix/contraction data.
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* Bits 12..11: Unused, 0.
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* Bit 10: CONTRACT_TRAILING_CCC flag.
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* Bit 9: CONTRACT_NEXT_CCC flag.
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* Bit 8: CONTRACT_SINGLE_CP_NO_MATCH flag.
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*/
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CONTRACTION_TAG = 9,
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/**
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* Decimal digit.
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* Bits 31..13: Index into uint32_t table for non-numeric-collation CE32.
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* Bit 12: Unused, 0.
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* Bits 11.. 8: Digit value 0..9.
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*/
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DIGIT_TAG = 10,
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/**
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* Tag for U+0000, for moving the NUL-termination handling
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* from the regular fastpath into specials-handling code.
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* Bits 31..8: Unused, 0.
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*/
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U0000_TAG = 11,
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/**
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* Tag for a Hangul syllable.
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* Bits 31..9: Unused, 0.
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* Bit 8: HANGUL_NO_SPECIAL_JAMO flag.
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*/
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HANGUL_TAG = 12,
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/**
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* Tag for a lead surrogate code unit.
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* Optional optimization for UTF-16 string processing.
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* Bits 31..10: Unused, 0.
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* 9.. 8: =0: All associated supplementary code points are unassigned-implict.
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* =1: All associated supplementary code points fall back to the base data.
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* else: (Normally 2) Look up the data for the supplementary code point.
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*/
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LEAD_SURROGATE_TAG = 13,
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/**
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* Tag for CEs with primary weights in code point order.
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* Bits 31..13: Index into CE table, for one data "CE".
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* Bits 12.. 8: Unused, 0.
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*
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* This data "CE" has the following bit fields:
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* Bits 63..32: Three-byte primary pppppp00.
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* 31.. 8: Start/base code point of the in-order range.
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* 7: Flag isCompressible primary.
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* 6.. 0: Per-code point primary-weight increment.
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*/
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OFFSET_TAG = 14,
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/**
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* Implicit CE tag. Compute an unassigned-implicit CE.
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* All bits are set (UNASSIGNED_CE32=0xffffffff).
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*/
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IMPLICIT_TAG = 15
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};
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static UBool isAssignedCE32(uint32_t ce32) {
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return ce32 != FALLBACK_CE32 && ce32 != UNASSIGNED_CE32;
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}
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/**
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* We limit the number of CEs in an expansion
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* so that we can use a small number of length bits in the data structure,
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* and so that an implementation can copy CEs at runtime without growing a destination buffer.
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*/
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static const int32_t MAX_EXPANSION_LENGTH = 31;
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static const int32_t MAX_INDEX = 0x7ffff;
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/**
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* Set if there is no match for the single (no-suffix) character itself.
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* This is only possible if there is a prefix.
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* In this case, discontiguous contraction matching cannot add combining marks
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* starting from an empty suffix.
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* The default CE32 is used anyway if there is no suffix match.
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*/
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static const uint32_t CONTRACT_SINGLE_CP_NO_MATCH = 0x100;
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/** Set if the first character of every contraction suffix has lccc!=0. */
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static const uint32_t CONTRACT_NEXT_CCC = 0x200;
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/** Set if any contraction suffix ends with lccc!=0. */
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static const uint32_t CONTRACT_TRAILING_CCC = 0x400;
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/** For HANGUL_TAG: None of its Jamo CE32s isSpecialCE32(). */
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static const uint32_t HANGUL_NO_SPECIAL_JAMO = 0x100;
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static const uint32_t LEAD_ALL_UNASSIGNED = 0;
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static const uint32_t LEAD_ALL_FALLBACK = 0x100;
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static const uint32_t LEAD_MIXED = 0x200;
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static const uint32_t LEAD_TYPE_MASK = 0x300;
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static uint32_t makeLongPrimaryCE32(uint32_t p) { return p | LONG_PRIMARY_CE32_LOW_BYTE; }
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/** Turns the long-primary CE32 into a primary weight pppppp00. */
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static inline uint32_t primaryFromLongPrimaryCE32(uint32_t ce32) {
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return ce32 & 0xffffff00;
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}
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static inline int64_t ceFromLongPrimaryCE32(uint32_t ce32) {
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return ((int64_t)(ce32 & 0xffffff00) << 32) | COMMON_SEC_AND_TER_CE;
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}
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static uint32_t makeLongSecondaryCE32(uint32_t lower32) {
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return lower32 | SPECIAL_CE32_LOW_BYTE | LONG_SECONDARY_TAG;
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}
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static inline int64_t ceFromLongSecondaryCE32(uint32_t ce32) {
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return ce32 & 0xffffff00;
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}
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/** Makes a special CE32 with tag, index and length. */
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static uint32_t makeCE32FromTagIndexAndLength(int32_t tag, int32_t index, int32_t length) {
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return (index << 13) | (length << 8) | SPECIAL_CE32_LOW_BYTE | tag;
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}
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/** Makes a special CE32 with only tag and index. */
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static uint32_t makeCE32FromTagAndIndex(int32_t tag, int32_t index) {
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return (index << 13) | SPECIAL_CE32_LOW_BYTE | tag;
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}
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static inline UBool isSpecialCE32(uint32_t ce32) {
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return (ce32 & 0xff) >= SPECIAL_CE32_LOW_BYTE;
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}
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static inline int32_t tagFromCE32(uint32_t ce32) {
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return (int32_t)(ce32 & 0xf);
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}
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static inline UBool hasCE32Tag(uint32_t ce32, int32_t tag) {
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return isSpecialCE32(ce32) && tagFromCE32(ce32) == tag;
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}
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static inline UBool isLongPrimaryCE32(uint32_t ce32) {
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return hasCE32Tag(ce32, LONG_PRIMARY_TAG);
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}
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static UBool isSimpleOrLongCE32(uint32_t ce32) {
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return !isSpecialCE32(ce32) ||
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tagFromCE32(ce32) == LONG_PRIMARY_TAG ||
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tagFromCE32(ce32) == LONG_SECONDARY_TAG;
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}
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/**
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* @return TRUE if the ce32 yields one or more CEs without further data lookups
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*/
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static UBool isSelfContainedCE32(uint32_t ce32) {
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return !isSpecialCE32(ce32) ||
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tagFromCE32(ce32) == LONG_PRIMARY_TAG ||
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tagFromCE32(ce32) == LONG_SECONDARY_TAG ||
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tagFromCE32(ce32) == LATIN_EXPANSION_TAG;
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}
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static inline UBool isPrefixCE32(uint32_t ce32) {
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return hasCE32Tag(ce32, PREFIX_TAG);
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}
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static inline UBool isContractionCE32(uint32_t ce32) {
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return hasCE32Tag(ce32, CONTRACTION_TAG);
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}
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static inline UBool ce32HasContext(uint32_t ce32) {
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return isSpecialCE32(ce32) &&
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(tagFromCE32(ce32) == PREFIX_TAG ||
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tagFromCE32(ce32) == CONTRACTION_TAG);
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}
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/**
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* Get the first of the two Latin-expansion CEs encoded in ce32.
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* @see LATIN_EXPANSION_TAG
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*/
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static inline int64_t latinCE0FromCE32(uint32_t ce32) {
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return ((int64_t)(ce32 & 0xff000000) << 32) | COMMON_SECONDARY_CE | ((ce32 & 0xff0000) >> 8);
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}
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/**
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* Get the second of the two Latin-expansion CEs encoded in ce32.
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* @see LATIN_EXPANSION_TAG
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*/
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static inline int64_t latinCE1FromCE32(uint32_t ce32) {
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return ((ce32 & 0xff00) << 16) | COMMON_TERTIARY_CE;
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}
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/**
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* Returns the data index from a special CE32.
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*/
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static inline int32_t indexFromCE32(uint32_t ce32) {
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return (int32_t)(ce32 >> 13);
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}
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/**
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* Returns the data length from a ce32.
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*/
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static inline int32_t lengthFromCE32(uint32_t ce32) {
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return (ce32 >> 8) & 31;
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}
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/**
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* Returns the digit value from a DIGIT_TAG ce32.
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*/
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static inline char digitFromCE32(uint32_t ce32) {
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return (char)((ce32 >> 8) & 0xf);
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}
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/** Returns a 64-bit CE from a simple CE32 (not special). */
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static inline int64_t ceFromSimpleCE32(uint32_t ce32) {
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// normal form ppppsstt -> pppp0000ss00tt00
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// assert (ce32 & 0xff) < SPECIAL_CE32_LOW_BYTE
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return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | ((ce32 & 0xff) << 8);
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}
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/** Returns a 64-bit CE from a simple/long-primary/long-secondary CE32. */
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static inline int64_t ceFromCE32(uint32_t ce32) {
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uint32_t tertiary = ce32 & 0xff;
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if(tertiary < SPECIAL_CE32_LOW_BYTE) {
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// normal form ppppsstt -> pppp0000ss00tt00
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return ((int64_t)(ce32 & 0xffff0000) << 32) | ((ce32 & 0xff00) << 16) | (tertiary << 8);
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} else {
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ce32 -= tertiary;
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if((tertiary & 0xf) == LONG_PRIMARY_TAG) {
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// long-primary form ppppppC1 -> pppppp00050000500
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return ((int64_t)ce32 << 32) | COMMON_SEC_AND_TER_CE;
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} else {
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// long-secondary form ssssttC2 -> 00000000sssstt00
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// assert (tertiary & 0xf) == LONG_SECONDARY_TAG
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return ce32;
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}
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}
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}
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/** Creates a CE from a primary weight. */
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static inline int64_t makeCE(uint32_t p) {
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return ((int64_t)p << 32) | COMMON_SEC_AND_TER_CE;
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}
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/**
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* Creates a CE from a primary weight,
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* 16-bit secondary/tertiary weights, and a 2-bit quaternary.
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|
*/
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static inline int64_t makeCE(uint32_t p, uint32_t s, uint32_t t, uint32_t q) {
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|
return ((int64_t)p << 32) | (s << 16) | t | (q << 6);
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|
}
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|
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|
/**
|
|
* Increments a 2-byte primary by a code point offset.
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|
*/
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|
static uint32_t incTwoBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible,
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|
int32_t offset);
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|
|
|
/**
|
|
* Increments a 3-byte primary by a code point offset.
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|
*/
|
|
static uint32_t incThreeBytePrimaryByOffset(uint32_t basePrimary, UBool isCompressible,
|
|
int32_t offset);
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|
|
|
/**
|
|
* Decrements a 2-byte primary by one range step (1..0x7f).
|
|
*/
|
|
static uint32_t decTwoBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step);
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|
|
|
/**
|
|
* Decrements a 3-byte primary by one range step (1..0x7f).
|
|
*/
|
|
static uint32_t decThreeBytePrimaryByOneStep(uint32_t basePrimary, UBool isCompressible, int32_t step);
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|
|
|
/**
|
|
* Computes a 3-byte primary for c's OFFSET_TAG data "CE".
|
|
*/
|
|
static uint32_t getThreeBytePrimaryForOffsetData(UChar32 c, int64_t dataCE);
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|
|
|
/**
|
|
* 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));
|
|
}
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|
|
|
private:
|
|
Collation(); // No instantiation.
|
|
};
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|
|
|
U_NAMESPACE_END
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|
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|
#endif // !UCONFIG_NO_COLLATION
|
|
#endif // __COLLATION_H__
|