// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2013-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* collationfastlatin.cpp
*
* created on: 2013aug18
* created by: Markus W. Scherer
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_COLLATION
#include "unicode/ucol.h"
#include "collationdata.h"
#include "collationfastlatin.h"
#include "collationsettings.h"
#include "uassert.h"
U_NAMESPACE_BEGIN
int32_t
CollationFastLatin::getOptions(const CollationData *data, const CollationSettings &settings,
uint16_t *primaries, int32_t capacity) {
const uint16_t *table = data->fastLatinTable;
if(table == NULL) { return -1; }
U_ASSERT(capacity == LATIN_LIMIT);
if(capacity != LATIN_LIMIT) { return -1; }
uint32_t 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 {
int32_t headerLength = *table & 0xff;
int32_t i = 1 + settings.getMaxVariable();
if(i >= headerLength) {
return -1; // variableTop >= digits, should not occur
}
miniVarTop = table[i];
}
UBool digitsAreReordered = FALSE;
if(settings.hasReordering()) {
uint32_t prevStart = 0;
uint32_t beforeDigitStart = 0;
uint32_t digitStart = 0;
uint32_t afterDigitStart = 0;
for(int32_t group = UCOL_REORDER_CODE_FIRST;
group < UCOL_REORDER_CODE_FIRST + CollationData::MAX_NUM_SPECIAL_REORDER_CODES;
++group) {
uint32_t start = data->getFirstPrimaryForGroup(group);
start = settings.reorder(start);
if(group == UCOL_REORDER_CODE_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;
}
}
uint32_t 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;
}
}
table += (table[0] & 0xff); // skip the header
for(UChar32 c = 0; c < LATIN_LIMIT; ++c) {
uint32_t p = table[c];
if(p >= MIN_SHORT) {
p &= SHORT_PRIMARY_MASK;
} else if(p > miniVarTop) {
p &= LONG_PRIMARY_MASK;
} else {
p = 0;
}
primaries[c] = (uint16_t)p;
}
if(digitsAreReordered || (settings.options & CollationSettings::NUMERIC) != 0) {
// Bail out for digits.
for(UChar32 c = 0x30; c <= 0x39; ++c) { primaries[c] = 0; }
}
// Shift the miniVarTop above other options.
return ((int32_t)miniVarTop << 16) | settings.options;
}
int32_t
CollationFastLatin::compareUTF16(const uint16_t *table, const uint16_t *primaries, int32_t options,
const UChar *left, int32_t leftLength,
const UChar *right, int32_t rightLength) {
// This is a modified copy of CollationCompare::compareUpToQuaternary(),
// optimized for common Latin text.
// Keep them in sync!
// Keep compareUTF16() and compareUTF8() in sync very closely!
U_ASSERT((table[0] >> 8) == VERSION);
table += (table[0] & 0xff); // skip the header
uint32_t variableTop = (uint32_t)options >> 16; // see getOptions()
options &= 0xffff; // needed for CollationSettings::getStrength() to work
// Check for supported characters, fetch mini CEs, and compare primaries.
int32_t leftIndex = 0, rightIndex = 0;
/**
* 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.
*/
uint32_t leftPair = 0, rightPair = 0;
for(;;) {
// We fetch CEs until we get a non-ignorable primary or reach the end.
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[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 {
leftPair = nextPair(table, c, leftPair, left, NULL, leftIndex, leftLength);
if(leftPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
leftPair = getPrimaries(variableTop, leftPair);
}
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[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 {
rightPair = nextPair(table, c, rightPair, right, NULL, rightIndex, rightLength);
if(rightPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
rightPair = getPrimaries(variableTop, rightPair);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftPrimary = leftPair & 0xffff;
uint32_t rightPrimary = rightPair & 0xffff;
if(leftPrimary != rightPrimary) {
// Return the primary difference.
return (leftPrimary < rightPrimary) ? UCOL_LESS : UCOL_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) >= UCOL_SECONDARY) {
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[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 {
leftPair = nextPair(table, c, leftPair, left, NULL, leftIndex, leftLength);
leftPair = getSecondaries(variableTop, leftPair);
}
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[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 {
rightPair = nextPair(table, c, rightPair, right, NULL, rightIndex, rightLength);
rightPair = getSecondaries(variableTop, rightPair);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftSecondary = leftPair & 0xffff;
uint32_t 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) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
}
if((options & CollationSettings::CASE_LEVEL) != 0) {
UBool strengthIsPrimary = CollationSettings::getStrength(options) == UCOL_PRIMARY;
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, left, NULL, leftIndex, leftLength);
}
leftPair = getCases(variableTop, strengthIsPrimary, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, right, NULL, rightIndex, rightLength);
}
rightPair = getCases(variableTop, strengthIsPrimary, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftCase = leftPair & 0xffff;
uint32_t rightCase = rightPair & 0xffff;
if(leftCase != rightCase) {
if((options & CollationSettings::UPPER_FIRST) == 0) {
return (leftCase < rightCase) ? UCOL_LESS : UCOL_GREATER;
} else {
return (leftCase < rightCase) ? UCOL_GREATER : UCOL_LESS;
}
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
}
if(CollationSettings::getStrength(options) <= UCOL_SECONDARY) { return UCOL_EQUAL; }
// Remove the case bits from the tertiary weight when caseLevel is on or caseFirst is off.
UBool withCaseBits = CollationSettings::isTertiaryWithCaseBits(options);
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, left, NULL, leftIndex, leftLength);
}
leftPair = getTertiaries(variableTop, withCaseBits, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, right, NULL, rightIndex, rightLength);
}
rightPair = getTertiaries(variableTop, withCaseBits, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftTertiary = leftPair & 0xffff;
uint32_t 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) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
if(CollationSettings::getStrength(options) <= UCOL_TERTIARY) { return UCOL_EQUAL; }
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, left, NULL, leftIndex, leftLength);
}
leftPair = getQuaternaries(variableTop, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= LATIN_MAX) ? table[c] : lookup(table, c);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, right, NULL, rightIndex, rightLength);
}
rightPair = getQuaternaries(variableTop, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftQuaternary = leftPair & 0xffff;
uint32_t rightQuaternary = rightPair & 0xffff;
if(leftQuaternary != rightQuaternary) {
return (leftQuaternary < rightQuaternary) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
return UCOL_EQUAL;
}
int32_t
CollationFastLatin::compareUTF8(const uint16_t *table, const uint16_t *primaries, int32_t options,
const uint8_t *left, int32_t leftLength,
const uint8_t *right, int32_t rightLength) {
// Keep compareUTF16() and compareUTF8() in sync very closely!
U_ASSERT((table[0] >> 8) == VERSION);
table += (table[0] & 0xff); // skip the header
uint32_t variableTop = (uint32_t)options >> 16; // see RuleBasedCollator::getFastLatinOptions()
options &= 0xffff; // needed for CollationSettings::getStrength() to work
// Check for supported characters, fetch mini CEs, and compare primaries.
int32_t leftIndex = 0, rightIndex = 0;
/**
* 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.
*/
uint32_t leftPair = 0, rightPair = 0;
// Note: There is no need to assemble the code point.
// We only need to look up the table entry for the character,
// and nextPair() looks for whether c==0.
for(;;) {
// We fetch CEs until we get a non-ignorable primary or reach the end.
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
uint8_t t;
if(c <= 0x7f) {
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(c <= LATIN_MAX_UTF8_LEAD && 0xc2 <= c && leftIndex != leftLength &&
0x80 <= (t = left[leftIndex]) && t <= 0xbf) {
++leftIndex;
c = ((c - 0xc2) << 6) + t;
leftPair = primaries[c];
if(leftPair != 0) { break; }
leftPair = table[c];
} else {
leftPair = lookupUTF8(table, c, left, leftIndex, leftLength);
}
if(leftPair >= MIN_SHORT) {
leftPair &= SHORT_PRIMARY_MASK;
break;
} else if(leftPair > variableTop) {
leftPair &= LONG_PRIMARY_MASK;
break;
} else {
leftPair = nextPair(table, c, leftPair, NULL, left, leftIndex, leftLength);
if(leftPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
leftPair = getPrimaries(variableTop, leftPair);
}
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
uint8_t t;
if(c <= 0x7f) {
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(c <= LATIN_MAX_UTF8_LEAD && 0xc2 <= c && rightIndex != rightLength &&
0x80 <= (t = right[rightIndex]) && t <= 0xbf) {
++rightIndex;
c = ((c - 0xc2) << 6) + t;
rightPair = primaries[c];
if(rightPair != 0) { break; }
rightPair = table[c];
} else {
rightPair = lookupUTF8(table, c, right, rightIndex, rightLength);
}
if(rightPair >= MIN_SHORT) {
rightPair &= SHORT_PRIMARY_MASK;
break;
} else if(rightPair > variableTop) {
rightPair &= LONG_PRIMARY_MASK;
break;
} else {
rightPair = nextPair(table, c, rightPair, NULL, right, rightIndex, rightLength);
if(rightPair == BAIL_OUT) { return BAIL_OUT_RESULT; }
rightPair = getPrimaries(variableTop, rightPair);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftPrimary = leftPair & 0xffff;
uint32_t rightPrimary = rightPair & 0xffff;
if(leftPrimary != rightPrimary) {
// Return the primary difference.
return (leftPrimary < rightPrimary) ? UCOL_LESS : UCOL_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) >= UCOL_SECONDARY) {
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
if(c <= 0x7f) {
leftPair = table[c];
} else if(c <= LATIN_MAX_UTF8_LEAD) {
leftPair = table[((c - 0xc2) << 6) + left[leftIndex++]];
} else {
leftPair = lookupUTF8Unsafe(table, c, left, leftIndex);
}
if(leftPair >= MIN_SHORT) {
leftPair = getSecondariesFromOneShortCE(leftPair);
break;
} else if(leftPair > variableTop) {
leftPair = COMMON_SEC_PLUS_OFFSET;
break;
} else {
leftPair = nextPair(table, c, leftPair, NULL, left, leftIndex, leftLength);
leftPair = getSecondaries(variableTop, leftPair);
}
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
if(c <= 0x7f) {
rightPair = table[c];
} else if(c <= LATIN_MAX_UTF8_LEAD) {
rightPair = table[((c - 0xc2) << 6) + right[rightIndex++]];
} else {
rightPair = lookupUTF8Unsafe(table, c, right, rightIndex);
}
if(rightPair >= MIN_SHORT) {
rightPair = getSecondariesFromOneShortCE(rightPair);
break;
} else if(rightPair > variableTop) {
rightPair = COMMON_SEC_PLUS_OFFSET;
break;
} else {
rightPair = nextPair(table, c, rightPair, NULL, right, rightIndex, rightLength);
rightPair = getSecondaries(variableTop, rightPair);
}
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftSecondary = leftPair & 0xffff;
uint32_t 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) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
}
if((options & CollationSettings::CASE_LEVEL) != 0) {
UBool strengthIsPrimary = CollationSettings::getStrength(options) == UCOL_PRIMARY;
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, left, leftIndex);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, NULL, left, leftIndex, leftLength);
}
leftPair = getCases(variableTop, strengthIsPrimary, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, right, rightIndex);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, NULL, right, rightIndex, rightLength);
}
rightPair = getCases(variableTop, strengthIsPrimary, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftCase = leftPair & 0xffff;
uint32_t rightCase = rightPair & 0xffff;
if(leftCase != rightCase) {
if((options & CollationSettings::UPPER_FIRST) == 0) {
return (leftCase < rightCase) ? UCOL_LESS : UCOL_GREATER;
} else {
return (leftCase < rightCase) ? UCOL_GREATER : UCOL_LESS;
}
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
}
if(CollationSettings::getStrength(options) <= UCOL_SECONDARY) { return UCOL_EQUAL; }
// Remove the case bits from the tertiary weight when caseLevel is on or caseFirst is off.
UBool withCaseBits = CollationSettings::isTertiaryWithCaseBits(options);
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, left, leftIndex);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, NULL, left, leftIndex, leftLength);
}
leftPair = getTertiaries(variableTop, withCaseBits, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, right, rightIndex);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, NULL, right, rightIndex, rightLength);
}
rightPair = getTertiaries(variableTop, withCaseBits, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftTertiary = leftPair & 0xffff;
uint32_t 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) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
if(CollationSettings::getStrength(options) <= UCOL_TERTIARY) { return UCOL_EQUAL; }
leftIndex = rightIndex = 0;
leftPair = rightPair = 0;
for(;;) {
while(leftPair == 0) {
if(leftIndex == leftLength) {
leftPair = EOS;
break;
}
UChar32 c = left[leftIndex++];
leftPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, left, leftIndex);
if(leftPair < MIN_LONG) {
leftPair = nextPair(table, c, leftPair, NULL, left, leftIndex, leftLength);
}
leftPair = getQuaternaries(variableTop, leftPair);
}
while(rightPair == 0) {
if(rightIndex == rightLength) {
rightPair = EOS;
break;
}
UChar32 c = right[rightIndex++];
rightPair = (c <= 0x7f) ? table[c] : lookupUTF8Unsafe(table, c, right, rightIndex);
if(rightPair < MIN_LONG) {
rightPair = nextPair(table, c, rightPair, NULL, right, rightIndex, rightLength);
}
rightPair = getQuaternaries(variableTop, rightPair);
}
if(leftPair == rightPair) {
if(leftPair == EOS) { break; }
leftPair = rightPair = 0;
continue;
}
uint32_t leftQuaternary = leftPair & 0xffff;
uint32_t rightQuaternary = rightPair & 0xffff;
if(leftQuaternary != rightQuaternary) {
return (leftQuaternary < rightQuaternary) ? UCOL_LESS : UCOL_GREATER;
}
if(leftPair == EOS) { break; }
leftPair >>= 16;
rightPair >>= 16;
}
return UCOL_EQUAL;
}
uint32_t
CollationFastLatin::lookup(const uint16_t *table, UChar32 c) {
U_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;
}
}
uint32_t
CollationFastLatin::lookupUTF8(const uint16_t *table, UChar32 c,
const uint8_t *s8, int32_t &sIndex, int32_t sLength) {
// The caller handled ASCII and valid/supported Latin.
U_ASSERT(c > 0x7f);
int32_t i2 = sIndex + 1;
if(i2 < sLength || sLength < 0) {
uint8_t t1 = s8[sIndex];
uint8_t t2 = s8[i2];
sIndex += 2;
if(c == 0xe2 && t1 == 0x80 && 0x80 <= t2 && t2 <= 0xbf) {
return table[(LATIN_LIMIT - 0x80) + t2]; // 2000..203F -> 0180..01BF
} else if(c == 0xef && t1 == 0xbf) {
if(t2 == 0xbe) {
return MERGE_WEIGHT; // U+FFFE
} else if(t2 == 0xbf) {
return MAX_SHORT | COMMON_SEC | LOWER_CASE | COMMON_TER; // U+FFFF
}
}
}
return BAIL_OUT;
}
uint32_t
CollationFastLatin::lookupUTF8Unsafe(const uint16_t *table, UChar32 c,
const uint8_t *s8, int32_t &sIndex) {
// The caller handled ASCII.
// The string is well-formed and contains only supported characters.
U_ASSERT(c > 0x7f);
if(c <= LATIN_MAX_UTF8_LEAD) {
return table[((c - 0xc2) << 6) + s8[sIndex++]]; // 0080..017F
}
uint8_t t2 = s8[sIndex + 1];
sIndex += 2;
if(c == 0xe2) {
return table[(LATIN_LIMIT - 0x80) + t2]; // 2000..203F -> 0180..01BF
} else if(t2 == 0xbe) {
return MERGE_WEIGHT; // U+FFFE
} else {
return MAX_SHORT | COMMON_SEC | LOWER_CASE | COMMON_TER; // U+FFFF
}
}
uint32_t
CollationFastLatin::nextPair(const uint16_t *table, UChar32 c, uint32_t ce,
const UChar *s16, const uint8_t *s8, int32_t &sIndex, int32_t &sLength) {
if(ce >= MIN_LONG || ce < CONTRACTION) {
return ce; // simple or special mini CE
} else if(ce >= EXPANSION) {
int32_t index = NUM_FAST_CHARS + (ce & INDEX_MASK);
return ((uint32_t)table[index + 1] << 16) | table[index];
} else /* ce >= CONTRACTION */ {
if(c == 0 && sLength < 0) {
sLength = sIndex - 1;
return EOS;
}
// Contraction list: Default mapping followed by
// 0 or more single-character contraction suffix mappings.
int32_t index = NUM_FAST_CHARS + (ce & INDEX_MASK);
if(sIndex != sLength) {
// Read the next character.
int32_t c2;
int32_t nextIndex = sIndex;
if(s16 != NULL) {
c2 = s16[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;
}
}
} else {
c2 = s8[nextIndex++];
if(c2 > 0x7f) {
uint8_t t;
if(c2 <= 0xc5 && 0xc2 <= c2 && nextIndex != sLength &&
0x80 <= (t = s8[nextIndex]) && t <= 0xbf) {
c2 = ((c2 - 0xc2) << 6) + t; // 0080..017F
++nextIndex;
} else {
int32_t i2 = nextIndex + 1;
if(i2 < sLength || sLength < 0) {
if(c2 == 0xe2 && s8[nextIndex] == 0x80 &&
0x80 <= (t = s8[i2]) && t <= 0xbf) {
c2 = (LATIN_LIMIT - 0x80) + t; // 2000..203F -> 0180..01BF
} else if(c2 == 0xef && s8[nextIndex] == 0xbf &&
((t = s8[i2]) == 0xbe || t == 0xbf)) {
c2 = -1; // U+FFFE & U+FFFF cannot occur in contractions.
} else {
return BAIL_OUT;
}
} else {
return BAIL_OUT;
}
nextIndex += 2;
}
}
}
if(c2 == 0 && sLength < 0) {
sLength = sIndex;
c2 = -1;
}
// Look for the next character in the contraction suffix list,
// which is in ascending order of single suffix characters.
int32_t i = index;
int32_t head = table[i]; // first skip the default mapping
int32_t x;
do {
i += head >> CONTR_LENGTH_SHIFT;
head = table[i];
x = head & CONTR_CHAR_MASK;
} while(x < c2);
if(x == c2) {
index = i;
sIndex = nextIndex;
}
}
// Return the CE or CEs for the default or contraction mapping.
int32_t length = table[index] >> CONTR_LENGTH_SHIFT;
if(length == 1) {
return BAIL_OUT;
}
ce = table[index + 1];
if(length == 2) {
return ce;
} else {
return ((uint32_t)table[index + 2] << 16) | ce;
}
}
}
uint32_t
CollationFastLatin::getSecondaries(uint32_t variableTop, uint32_t 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 {
uint32_t 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 {
U_ASSERT(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
uint32_t
CollationFastLatin::getCases(uint32_t variableTop, UBool strengthIsPrimary, uint32_t 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.
uint32_t 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
uint32_t 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 {
U_ASSERT(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
uint32_t
CollationFastLatin::getTertiaries(uint32_t variableTop, UBool withCaseBits, uint32_t 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.
uint32_t 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
uint32_t 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 {
U_ASSERT(ce >= MIN_LONG);
pair = 0; // variable
}
}
return pair;
}
uint32_t
CollationFastLatin::getQuaternaries(uint32_t variableTop, uint32_t 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
uint32_t ce = pair & 0xffff;
if(ce > variableTop) {
pair = TWO_SHORT_PRIMARIES_MASK;
} else {
U_ASSERT(ce >= MIN_LONG);
pair &= TWO_LONG_PRIMARIES_MASK; // variable
}
}
return pair;
}
U_NAMESPACE_END
#endif // !UCONFIG_NO_COLLATION