com.ibm.icu.impl.coll.CollationFastLatin Maven / Gradle / Ivy
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With inspiration from other libraries
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
* Copyright (C) 2013-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* CollationFastLatin.java, ported from collationfastlatin.h/.cpp
*
* C++ version created on: 2013aug09
* created by: Markus W. Scherer
*/
package com.ibm.icu.impl.coll;
import com.ibm.icu.lang.UScript;
import com.ibm.icu.text.Collator;
public final class CollationFastLatin /* all static */ {
/**
* Fast Latin format version (one byte 1..FF).
* Must be incremented for any runtime-incompatible changes,
* in particular, for changes to any of the following constants.
*
* When the major version number of the main data format changes,
* we can reset this fast Latin version to 1.
*/
public static final int VERSION = 2;
public static final int LATIN_MAX = 0x17f;
public static final int LATIN_LIMIT = LATIN_MAX + 1;
static final int LATIN_MAX_UTF8_LEAD = 0xc5; // UTF-8 lead byte of LATIN_MAX
static final int PUNCT_START = 0x2000;
static final int PUNCT_LIMIT = 0x2040;
// excludes U+FFFE & U+FFFF
static final int NUM_FAST_CHARS = LATIN_LIMIT + (PUNCT_LIMIT - PUNCT_START);
// Note on the supported weight ranges:
// Analysis of UCA 6.3 and CLDR 23 non-search tailorings shows that
// the CEs for characters in the above ranges, excluding expansions with length >2,
// excluding contractions of >2 characters, and other restrictions
// (see the builder's getCEsFromCE32()),
// use at most about 150 primary weights,
// where about 94 primary weights are possibly-variable (space/punct/symbol/currency),
// at most 4 secondary before-common weights,
// at most 4 secondary after-common weights,
// at most 16 secondary high weights (in secondary CEs), and
// at most 4 tertiary after-common weights.
// The following ranges are designed to support slightly more weights than that.
// (en_US_POSIX is unusual: It creates about 64 variable + 116 Latin primaries.)
// Digits may use long primaries (preserving more short ones)
// or short primaries (faster) without changing this data structure.
// (If we supported numeric collation, then digits would have to have long primaries
// so that special handling does not affect the fast path.)
static final int SHORT_PRIMARY_MASK = 0xfc00; // bits 15..10
static final int INDEX_MASK = 0x3ff; // bits 9..0 for expansions & contractions
static final int SECONDARY_MASK = 0x3e0; // bits 9..5
static final int CASE_MASK = 0x18; // bits 4..3
static final int LONG_PRIMARY_MASK = 0xfff8; // bits 15..3
static final int TERTIARY_MASK = 7; // bits 2..0
static final int CASE_AND_TERTIARY_MASK = CASE_MASK | TERTIARY_MASK;
static final int TWO_SHORT_PRIMARIES_MASK =
(SHORT_PRIMARY_MASK << 16) | SHORT_PRIMARY_MASK; // 0xfc00fc00
static final int TWO_LONG_PRIMARIES_MASK =
(LONG_PRIMARY_MASK << 16) | LONG_PRIMARY_MASK; // 0xfff8fff8
static final int TWO_SECONDARIES_MASK =
(SECONDARY_MASK << 16) | SECONDARY_MASK; // 0x3e003e0
static final int TWO_CASES_MASK =
(CASE_MASK << 16) | CASE_MASK; // 0x180018
static final int TWO_TERTIARIES_MASK =
(TERTIARY_MASK << 16) | TERTIARY_MASK; // 0x70007
/**
* Contraction with one fast Latin character.
* Use INDEX_MASK to find the start of the contraction list after the fixed table.
* The first entry contains the default mapping.
* Otherwise use CONTR_CHAR_MASK for the contraction character index
* (in ascending order).
* Use CONTR_LENGTH_SHIFT for the length of the entry
* (1=BAIL_OUT, 2=one CE, 3=two CEs).
*
* Also, U+0000 maps to a contraction entry, so that the fast path need not
* check for NUL termination.
* It usually maps to a contraction list with only the completely ignorable default value.
*/
static final int CONTRACTION = 0x400;
/**
* An expansion encodes two CEs.
* Use INDEX_MASK to find the pair of CEs after the fixed table.
*
* The higher a mini CE value, the easier it is to process.
* For expansions and higher, no context needs to be considered.
*/
static final int EXPANSION = 0x800;
/**
* Encodes one CE with a long/low mini primary (there are 128).
* All potentially-variable primaries must be in this range,
* to make the short-primary path as fast as possible.
*/
static final int MIN_LONG = 0xc00;
static final int LONG_INC = 8;
static final int MAX_LONG = 0xff8;
/**
* Encodes one CE with a short/high primary (there are 60),
* plus a secondary CE if the secondary weight is high.
* Fast handling: At least all letter primaries should be in this range.
*/
static final int MIN_SHORT = 0x1000;
static final int SHORT_INC = 0x400;
/** The highest primary weight is reserved for U+FFFF. */
static final int MAX_SHORT = SHORT_PRIMARY_MASK;
static final int MIN_SEC_BEFORE = 0; // must add SEC_OFFSET
static final int SEC_INC = 0x20;
static final int MAX_SEC_BEFORE = MIN_SEC_BEFORE + 4 * SEC_INC; // 5 before common
static final int COMMON_SEC = MAX_SEC_BEFORE + SEC_INC;
static final int MIN_SEC_AFTER = COMMON_SEC + SEC_INC;
static final int MAX_SEC_AFTER = MIN_SEC_AFTER + 5 * SEC_INC; // 6 after common
static final int MIN_SEC_HIGH = MAX_SEC_AFTER + SEC_INC; // 20 high secondaries
static final int MAX_SEC_HIGH = SECONDARY_MASK;
/**
* Lookup: Add this offset to secondary weights, except for completely ignorable CEs.
* Must be greater than any special value, e.g., MERGE_WEIGHT.
* The exact value is not relevant for the format version.
*/
static final int SEC_OFFSET = SEC_INC;
static final int COMMON_SEC_PLUS_OFFSET = COMMON_SEC + SEC_OFFSET;
static final int TWO_SEC_OFFSETS =
(SEC_OFFSET << 16) | SEC_OFFSET; // 0x200020
static final int TWO_COMMON_SEC_PLUS_OFFSET =
(COMMON_SEC_PLUS_OFFSET << 16) | COMMON_SEC_PLUS_OFFSET;
static final int LOWER_CASE = 8; // case bits include this offset
static final int TWO_LOWER_CASES = (LOWER_CASE << 16) | LOWER_CASE; // 0x80008
static final int COMMON_TER = 0; // must add TER_OFFSET
static final int MAX_TER_AFTER = 7; // 7 after common
/**
* Lookup: Add this offset to tertiary weights, except for completely ignorable CEs.
* Must be greater than any special value, e.g., MERGE_WEIGHT.
* Must be greater than case bits as well, so that with combined case+tertiary weights
* plus the offset the tertiary bits does not spill over into the case bits.
* The exact value is not relevant for the format version.
*/
static final int TER_OFFSET = SEC_OFFSET;
static final int COMMON_TER_PLUS_OFFSET = COMMON_TER + TER_OFFSET;
static final int TWO_TER_OFFSETS = (TER_OFFSET << 16) | TER_OFFSET;
static final int TWO_COMMON_TER_PLUS_OFFSET =
(COMMON_TER_PLUS_OFFSET << 16) | COMMON_TER_PLUS_OFFSET;
static final int MERGE_WEIGHT = 3;
static final int EOS = 2; // end of string
static final int BAIL_OUT = 1;
/**
* Contraction result first word bits 8..0 contain the
* second contraction character, as a char index 0..NUM_FAST_CHARS-1.
* Each contraction list is terminated with a word containing CONTR_CHAR_MASK.
*/
static final int CONTR_CHAR_MASK = 0x1ff;
/**
* Contraction result first word bits 10..9 contain the result length:
* 1=bail out, 2=one mini CE, 3=two mini CEs
*/
static final int CONTR_LENGTH_SHIFT = 9;
/**
* Comparison return value when the regular comparison must be used.
* The exact value is not relevant for the format version.
*/
public static final int BAIL_OUT_RESULT = -2;
static int getCharIndex(char c) {
if(c <= LATIN_MAX) {
return c;
} else if(PUNCT_START <= c && c < PUNCT_LIMIT) {
return c - (PUNCT_START - LATIN_LIMIT);
} else {
// Not a fast Latin character.
// Note: U+FFFE & U+FFFF are forbidden in tailorings
// and thus do not occur in any contractions.
return -1;
}
}
/**
* Computes the options value for the compare functions
* and writes the precomputed primary weights.
* Returns -1 if the Latin fastpath is not supported for the data and settings.
* The capacity must be LATIN_LIMIT.
*/
public static int getOptions(CollationData data, CollationSettings settings,
char[] primaries) {
char[] header = data.fastLatinTableHeader;
if(header == null) { return -1; }
assert((header[0] >> 8) == VERSION);
if(primaries.length != LATIN_LIMIT) {
assert false;
return -1;
}
int miniVarTop;
if((settings.options & CollationSettings.ALTERNATE_MASK) == 0) {
// No mini primaries are variable, set a variableTop just below the
// lowest long mini primary.
miniVarTop = MIN_LONG - 1;
} else {
int headerLength = header[0] & 0xff;
int i = 1 + settings.getMaxVariable();
if(i >= headerLength) {
return -1; // variableTop >= digits, should not occur
}
miniVarTop = header[i];
}
boolean digitsAreReordered = false;
if(settings.hasReordering()) {
long prevStart = 0;
long beforeDigitStart = 0;
long digitStart = 0;
long afterDigitStart = 0;
for(int group = Collator.ReorderCodes.FIRST;
group < Collator.ReorderCodes.FIRST + CollationData.MAX_NUM_SPECIAL_REORDER_CODES;
++group) {
long start = data.getFirstPrimaryForGroup(group);
start = settings.reorder(start);
if(group == Collator.ReorderCodes.DIGIT) {
beforeDigitStart = prevStart;
digitStart = start;
} else if(start != 0) {
if(start < prevStart) {
// The permutation affects the groups up to Latin.
return -1;
}
// In the future, there might be a special group between digits & Latin.
if(digitStart != 0 && afterDigitStart == 0 && prevStart == beforeDigitStart) {
afterDigitStart = start;
}
prevStart = start;
}
}
long latinStart = data.getFirstPrimaryForGroup(UScript.LATIN);
latinStart = settings.reorder(latinStart);
if(latinStart < prevStart) {
return -1;
}
if(afterDigitStart == 0) {
afterDigitStart = latinStart;
}
if(!(beforeDigitStart < digitStart && digitStart < afterDigitStart)) {
digitsAreReordered = true;
}
}
char[] table = data.fastLatinTable; // skip the header
for(int c = 0; c < LATIN_LIMIT; ++c) {
int p = table[c];
if(p >= MIN_SHORT) {
p &= SHORT_PRIMARY_MASK;
} else if(p > miniVarTop) {
p &= LONG_PRIMARY_MASK;
} else {
p = 0;
}
primaries[c] = (char)p;
}
if(digitsAreReordered || (settings.options & CollationSettings.NUMERIC) != 0) {
// Bail out for digits.
for(int c = 0x30; c <= 0x39; ++c) { primaries[c] = 0; }
}
// Shift the miniVarTop above other options.
return (miniVarTop << 16) | settings.options;
}
public static int compareUTF16(char[] table, char[] primaries, int options,
CharSequence left, CharSequence right, int startIndex) {
// This is a modified copy of CollationCompare.compareUpToQuaternary(),
// optimized for common Latin text.
// Keep them in sync!
int variableTop = options >> 16; // see getOptions()
options &= 0xffff; // needed for CollationSettings.getStrength() to work
// Check for supported characters, fetch mini CEs, and compare primaries.
int leftIndex = startIndex, rightIndex = startIndex;
/**
* Single mini CE or a pair.
* The current mini CE is in the lower 16 bits, the next one is in the upper 16 bits.
* If there is only one, then it is in the lower bits, and the upper bits are 0.
*/
int leftPair = 0, rightPair = 0;
for(;;) {
// We fetch CEs until we get a non-ignorable primary or reach the end.
while(leftPair == 0) {
if(leftIndex == left.length()) {
leftPair = EOS;
break;
}
int c = left.charAt(leftIndex++);
if(c <= LATIN_MAX) {
leftPair = primaries[c];
if(leftPair != 0) { break; }
if(c <= 0x39 && c >= 0x30 && (options & CollationSettings.NUMERIC) != 0) {
return BAIL_OUT_RESULT;
}
leftPair = table[c];
} else if(PUNCT_START <= c && c < PUNCT_LIMIT) {
leftPair = table[c - PUNCT_START + LATIN_LIMIT];
} else {
leftPair = lookup(table, c);
}
if(leftPair >= MIN_SHORT) {
leftPair &= SHORT_PRIMARY_MASK;
break;
} else if(leftPair > variableTop) {
leftPair &= LONG_PRIMARY_MASK;
break;
} else {
long pairAndInc = nextPair(table, c, leftPair, left, leftIndex);
if(pairAndInc < 0) {
++leftIndex;
pairAndInc = ~pairAndInc;
}
leftPair = (int)pairAndInc;
if(leftPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
leftPair = getPrimaries(variableTop, leftPair);
}
}
while(rightPair == 0) {
if(rightIndex == right.length()) {
rightPair = EOS;
break;
}
int c = right.charAt(rightIndex++);
if(c <= LATIN_MAX) {
rightPair = primaries[c];
if(rightPair != 0) { break; }
if(c <= 0x39 && c >= 0x30 && (options & CollationSettings.NUMERIC) != 0) {
return BAIL_OUT_RESULT;
}
rightPair = table[c];
} else if(PUNCT_START <= c && c < PUNCT_LIMIT) {
rightPair = table[c - PUNCT_START + LATIN_LIMIT];
} else {
rightPair = lookup(table, c);
}
if(rightPair >= MIN_SHORT) {
rightPair &= SHORT_PRIMARY_MASK;
break;
} else if(rightPair > variableTop) {
rightPair &= LONG_PRIMARY_MASK;
break;
} else {
long pairAndInc = nextPair(table, c, rightPair, right, rightIndex);
if(pairAndInc < 0) {
++rightIndex;
pairAndInc = ~pairAndInc;
}
rightPair = (int)pairAndInc;
if(rightPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
rightPair = getPrimaries(variableTop, rightPair);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
int leftPrimary = leftPair & 0xffff;
int rightPrimary = rightPair & 0xffff;
if(leftPrimary != rightPrimary) {
// Return the primary difference.
return (leftPrimary < rightPrimary) ? Collation.LESS : Collation.GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>>= 16;
rightPair >>>= 16;
}
// In the following, we need to re-fetch each character because we did not buffer the CEs,
// but we know that the string is well-formed and
// only contains supported characters and mappings.
// We might skip the secondary level but continue with the case level
// which is turned on separately.
if(CollationSettings.getStrength(options) >= Collator.SECONDARY) {
leftIndex = rightIndex = startIndex;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == left.length()) {
leftPair = EOS;
break;
}
int c = left.charAt(leftIndex++);
if(c <= LATIN_MAX) {
leftPair = table[c];
} else if(PUNCT_START <= c && c < PUNCT_LIMIT) {
leftPair = table[c - PUNCT_START + LATIN_LIMIT];
} else {
leftPair = lookup(table, c);
}
if(leftPair >= MIN_SHORT) {
leftPair = getSecondariesFromOneShortCE(leftPair);
break;
} else if(leftPair > variableTop) {
leftPair = COMMON_SEC_PLUS_OFFSET;
break;
} else {
long pairAndInc = nextPair(table, c, leftPair, left, leftIndex);
if(pairAndInc < 0) {
++leftIndex;
pairAndInc = ~pairAndInc;
}
leftPair = getSecondaries(variableTop, (int)pairAndInc);
}
}
while(rightPair == 0) {
if(rightIndex == right.length()) {
rightPair = EOS;
break;
}
int c = right.charAt(rightIndex++);
if(c <= LATIN_MAX) {
rightPair = table[c];
} else if(PUNCT_START <= c && c < PUNCT_LIMIT) {
rightPair = table[c - PUNCT_START + LATIN_LIMIT];
} else {
rightPair = lookup(table, c);
}
if(rightPair >= MIN_SHORT) {
rightPair = getSecondariesFromOneShortCE(rightPair);
break;
} else if(rightPair > variableTop) {
rightPair = COMMON_SEC_PLUS_OFFSET;
break;
} else {
long pairAndInc = nextPair(table, c, rightPair, right, rightIndex);
if(pairAndInc < 0) {
++rightIndex;
pairAndInc = ~pairAndInc;
}
rightPair = getSecondaries(variableTop, (int)pairAndInc);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
int leftSecondary = leftPair & 0xffff;
int rightSecondary = rightPair & 0xffff;
if(leftSecondary != rightSecondary) {
if((options & CollationSettings.BACKWARD_SECONDARY) != 0) {
// Full support for backwards secondary requires backwards contraction matching
// and moving backwards between merge separators.
return BAIL_OUT_RESULT;
}
return (leftSecondary < rightSecondary) ? Collation.LESS : Collation.GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>>= 16;
rightPair >>>= 16;
}
}
if((options & CollationSettings.CASE_LEVEL) != 0) {
boolean strengthIsPrimary = CollationSettings.getStrength(options) == Collator.PRIMARY;
leftIndex = rightIndex = startIndex;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == left.length()) {
leftPair = EOS;
break;
}
int c = left.charAt(leftIndex++);
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, leftPair, left, leftIndex);
if(pairAndInc < 0) {
++leftIndex;
pairAndInc = ~pairAndInc;
}
leftPair = (int)pairAndInc;
}
leftPair = getCases(variableTop, strengthIsPrimary, leftPair);
}
while(rightPair == 0) {
if(rightIndex == right.length()) {
rightPair = EOS;
break;
}
int c = right.charAt(rightIndex++);
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, rightPair, right, rightIndex);
if(pairAndInc < 0) {
++rightIndex;
pairAndInc = ~pairAndInc;
}
rightPair = (int)pairAndInc;
}
rightPair = getCases(variableTop, strengthIsPrimary, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
int leftCase = leftPair & 0xffff;
int rightCase = rightPair & 0xffff;
if(leftCase != rightCase) {
if((options & CollationSettings.UPPER_FIRST) == 0) {
return (leftCase < rightCase) ? Collation.LESS : Collation.GREATER;
} else {
return (leftCase < rightCase) ? Collation.GREATER : Collation.LESS;
}
}
if(leftPair == EOS) { break; }
leftPair >>>= 16;
rightPair >>>= 16;
}
}
if(CollationSettings.getStrength(options) <= Collator.SECONDARY) { return Collation.EQUAL; }
// Remove the case bits from the tertiary weight when caseLevel is on or caseFirst is off.
boolean withCaseBits = CollationSettings.isTertiaryWithCaseBits(options);
leftIndex = rightIndex = startIndex;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == left.length()) {
leftPair = EOS;
break;
}
int c = left.charAt(leftIndex++);
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, leftPair, left, leftIndex);
if(pairAndInc < 0) {
++leftIndex;
pairAndInc = ~pairAndInc;
}
leftPair = (int)pairAndInc;
}
leftPair = getTertiaries(variableTop, withCaseBits, leftPair);
}
while(rightPair == 0) {
if(rightIndex == right.length()) {
rightPair = EOS;
break;
}
int c = right.charAt(rightIndex++);
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, rightPair, right, rightIndex);
if(pairAndInc < 0) {
++rightIndex;
pairAndInc = ~pairAndInc;
}
rightPair = (int)pairAndInc;
}
rightPair = getTertiaries(variableTop, withCaseBits, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
int leftTertiary = leftPair & 0xffff;
int rightTertiary = rightPair & 0xffff;
if(leftTertiary != rightTertiary) {
if(CollationSettings.sortsTertiaryUpperCaseFirst(options)) {
// Pass through EOS and MERGE_WEIGHT
// and keep real tertiary weights larger than the MERGE_WEIGHT.
// Tertiary CEs (secondary ignorables) are not supported in fast Latin.
if(leftTertiary > MERGE_WEIGHT) {
leftTertiary ^= CASE_MASK;
}
if(rightTertiary > MERGE_WEIGHT) {
rightTertiary ^= CASE_MASK;
}
}
return (leftTertiary < rightTertiary) ? Collation.LESS : Collation.GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>>= 16;
rightPair >>>= 16;
}
if(CollationSettings.getStrength(options) <= Collator.TERTIARY) { return Collation.EQUAL; }
leftIndex = rightIndex = startIndex;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == left.length()) {
leftPair = EOS;
break;
}
int c = left.charAt(leftIndex++);
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, leftPair, left, leftIndex);
if(pairAndInc < 0) {
++leftIndex;
pairAndInc = ~pairAndInc;
}
leftPair = (int)pairAndInc;
}
leftPair = getQuaternaries(variableTop, leftPair);
}
while(rightPair == 0) {
if(rightIndex == right.length()) {
rightPair = EOS;
break;
}
int c = right.charAt(rightIndex++);
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
long pairAndInc = nextPair(table, c, rightPair, right, rightIndex);
if(pairAndInc < 0) {
++rightIndex;
pairAndInc = ~pairAndInc;
}
rightPair = (int)pairAndInc;
}
rightPair = getQuaternaries(variableTop, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
int leftQuaternary = leftPair & 0xffff;
int rightQuaternary = rightPair & 0xffff;
if(leftQuaternary != rightQuaternary) {
return (leftQuaternary < rightQuaternary) ? Collation.LESS : Collation.GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>>= 16;
rightPair >>>= 16;
}
return Collation.EQUAL;
}
private static int lookup(char[] table, int c) {
assert(c > LATIN_MAX);
if(PUNCT_START <= c && c < PUNCT_LIMIT) {
return table[c - PUNCT_START + LATIN_LIMIT];
} else if(c == 0xfffe) {
return MERGE_WEIGHT;
} else if(c == 0xffff) {
return MAX_SHORT | COMMON_SEC | LOWER_CASE | COMMON_TER;
} else {
return BAIL_OUT;
}
}
/**
* Java returns a negative result (use the '~' operator) if sIndex is to be incremented.
* C++ modifies sIndex.
*/
private static long nextPair(char[] table, int c, int ce, CharSequence s16, int sIndex) {
if(ce >= MIN_LONG || ce < CONTRACTION) {
return ce; // simple or special mini CE
} else if(ce >= EXPANSION) {
int index = NUM_FAST_CHARS + (ce & INDEX_MASK);
return ((long)table[index + 1] << 16) | table[index];
} else /* ce >= CONTRACTION */ {
// Contraction list: Default mapping followed by
// 0 or more single-character contraction suffix mappings.
int index = NUM_FAST_CHARS + (ce & INDEX_MASK);
boolean inc = false; // true if the next char is consumed.
if(sIndex != s16.length()) {
// Read the next character.
int c2;
int nextIndex = sIndex;
c2 = s16.charAt(nextIndex++);
if(c2 > LATIN_MAX) {
if(PUNCT_START <= c2 && c2 < PUNCT_LIMIT) {
c2 = c2 - PUNCT_START + LATIN_LIMIT; // 2000..203F -> 0180..01BF
} else if(c2 == 0xfffe || c2 == 0xffff) {
c2 = -1; // U+FFFE & U+FFFF cannot occur in contractions.
} else {
return BAIL_OUT;
}
}
// Look for the next character in the contraction suffix list,
// which is in ascending order of single suffix characters.
int i = index;
int head = table[i]; // first skip the default mapping
int x;
do {
i += head >> CONTR_LENGTH_SHIFT;
head = table[i];
x = head & CONTR_CHAR_MASK;
} while(x < c2);
if(x == c2) {
index = i;
inc = true;
}
}
// Return the CE or CEs for the default or contraction mapping.
int length = table[index] >> CONTR_LENGTH_SHIFT;
if(length == 1) {
return BAIL_OUT;
}
ce = table[index + 1];
long result;
if(length == 2) {
result = ce;
} else {
result = ((long)table[index + 2] << 16) | ce;
}
return inc ? ~result : result;
}
}
private static int getPrimaries(int variableTop, int pair) {
int ce = pair & 0xffff;
if(ce >= MIN_SHORT) { return pair & TWO_SHORT_PRIMARIES_MASK; }
if(ce > variableTop) { return pair & TWO_LONG_PRIMARIES_MASK; }
if(ce >= MIN_LONG) { return 0; } // variable
return pair; // special mini CE
}
private static int getSecondariesFromOneShortCE(int ce) {
ce &= SECONDARY_MASK;
if(ce < MIN_SEC_HIGH) {
return ce + SEC_OFFSET;
} else {
return ((ce + SEC_OFFSET) << 16) | COMMON_SEC_PLUS_OFFSET;
}
}
private static int getSecondaries(int variableTop, int pair) {
if(pair <= 0xffff) {
// one mini CE
if(pair >= MIN_SHORT) {
pair = getSecondariesFromOneShortCE(pair);
} else if(pair > variableTop) {
pair = COMMON_SEC_PLUS_OFFSET;
} else if(pair >= MIN_LONG) {
pair = 0; // variable
}
// else special mini CE
} else {
int ce = pair & 0xffff;
if(ce >= MIN_SHORT) {
pair = (pair & TWO_SECONDARIES_MASK) + TWO_SEC_OFFSETS;
} else if(ce > variableTop) {
pair = TWO_COMMON_SEC_PLUS_OFFSET;
} else {
assert(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
private static int getCases(int variableTop, boolean strengthIsPrimary, int pair) {
// Primary+caseLevel: Ignore case level weights of primary ignorables.
// Otherwise: Ignore case level weights of secondary ignorables.
// For details see the comments in the CollationCompare class.
// Tertiary CEs (secondary ignorables) are not supported in fast Latin.
if(pair <= 0xffff) {
// one mini CE
if(pair >= MIN_SHORT) {
// A high secondary weight means we really have two CEs,
// a primary CE and a secondary CE.
int ce = pair;
pair &= CASE_MASK; // explicit weight of primary CE
if(!strengthIsPrimary && (ce & SECONDARY_MASK) >= MIN_SEC_HIGH) {
pair |= LOWER_CASE << 16; // implied weight of secondary CE
}
} else if(pair > variableTop) {
pair = LOWER_CASE;
} else if(pair >= MIN_LONG) {
pair = 0; // variable
}
// else special mini CE
} else {
// two mini CEs, same primary groups, neither expands like above
int ce = pair & 0xffff;
if(ce >= MIN_SHORT) {
if(strengthIsPrimary && (pair & (SHORT_PRIMARY_MASK << 16)) == 0) {
pair &= CASE_MASK;
} else {
pair &= TWO_CASES_MASK;
}
} else if(ce > variableTop) {
pair = TWO_LOWER_CASES;
} else {
assert(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
private static int getTertiaries(int variableTop, boolean withCaseBits, int pair) {
if(pair <= 0xffff) {
// one mini CE
if(pair >= MIN_SHORT) {
// A high secondary weight means we really have two CEs,
// a primary CE and a secondary CE.
int ce = pair;
if(withCaseBits) {
pair = (pair & CASE_AND_TERTIARY_MASK) + TER_OFFSET;
if((ce & SECONDARY_MASK) >= MIN_SEC_HIGH) {
pair |= (LOWER_CASE | COMMON_TER_PLUS_OFFSET) << 16;
}
} else {
pair = (pair & TERTIARY_MASK) + TER_OFFSET;
if((ce & SECONDARY_MASK) >= MIN_SEC_HIGH) {
pair |= COMMON_TER_PLUS_OFFSET << 16;
}
}
} else if(pair > variableTop) {
pair = (pair & TERTIARY_MASK) + TER_OFFSET;
if(withCaseBits) {
pair |= LOWER_CASE;
}
} else if(pair >= MIN_LONG) {
pair = 0; // variable
}
// else special mini CE
} else {
// two mini CEs, same primary groups, neither expands like above
int ce = pair & 0xffff;
if(ce >= MIN_SHORT) {
if(withCaseBits) {
pair &= TWO_CASES_MASK | TWO_TERTIARIES_MASK;
} else {
pair &= TWO_TERTIARIES_MASK;
}
pair += TWO_TER_OFFSETS;
} else if(ce > variableTop) {
pair = (pair & TWO_TERTIARIES_MASK) + TWO_TER_OFFSETS;
if(withCaseBits) {
pair |= TWO_LOWER_CASES;
}
} else {
assert(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
private static int getQuaternaries(int variableTop, int pair) {
// Return the primary weight of a variable CE,
// or the maximum primary weight for a non-variable, not-completely-ignorable CE.
if(pair <= 0xffff) {
// one mini CE
if(pair >= MIN_SHORT) {
// A high secondary weight means we really have two CEs,
// a primary CE and a secondary CE.
if((pair & SECONDARY_MASK) >= MIN_SEC_HIGH) {
pair = TWO_SHORT_PRIMARIES_MASK;
} else {
pair = SHORT_PRIMARY_MASK;
}
} else if(pair > variableTop) {
pair = SHORT_PRIMARY_MASK;
} else if(pair >= MIN_LONG) {
pair &= LONG_PRIMARY_MASK; // variable
}
// else special mini CE
} else {
// two mini CEs, same primary groups, neither expands like above
int ce = pair & 0xffff;
if(ce > variableTop) {
pair = TWO_SHORT_PRIMARIES_MASK;
} else {
assert(ce >= MIN_LONG);
pair &= TWO_LONG_PRIMARIES_MASK; // variable
}
}
return pair;
}
private CollationFastLatin() {} // no constructor
}