current/deps/icu-small/source/i18n/collationdata.cpp
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2012-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* collationdata.cpp
*
* created on: 2012jul28
* created by: Markus W. Scherer
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_COLLATION
#include "unicode/ucol.h"
#include "unicode/udata.h"
#include "unicode/uscript.h"
#include "cmemory.h"
#include "collation.h"
#include "collationdata.h"
#include "uassert.h"
#include "utrie2.h"
#include "uvectr32.h"
U_NAMESPACE_BEGIN
uint32_t
CollationData::getIndirectCE32(uint32_t ce32) const {
U_ASSERT(Collation::isSpecialCE32(ce32));
int32_t tag = Collation::tagFromCE32(ce32);
if(tag == Collation::DIGIT_TAG) {
// Fetch the non-numeric-collation CE32.
ce32 = ce32s[Collation::indexFromCE32(ce32)];
} else if(tag == Collation::LEAD_SURROGATE_TAG) {
ce32 = Collation::UNASSIGNED_CE32;
} else if(tag == Collation::U0000_TAG) {
// Fetch the normal ce32 for U+0000.
ce32 = ce32s[0];
}
return ce32;
}
uint32_t
CollationData::getFinalCE32(uint32_t ce32) const {
if(Collation::isSpecialCE32(ce32)) {
ce32 = getIndirectCE32(ce32);
}
return ce32;
}
int64_t
CollationData::getSingleCE(UChar32 c, UErrorCode &errorCode) const {
if(U_FAILURE(errorCode)) { return 0; }
// Keep parallel with CollationDataBuilder::getSingleCE().
const CollationData *d;
uint32_t ce32 = getCE32(c);
if(ce32 == Collation::FALLBACK_CE32) {
d = base;
ce32 = base->getCE32(c);
} else {
d = this;
}
while(Collation::isSpecialCE32(ce32)) {
switch(Collation::tagFromCE32(ce32)) {
case Collation::LATIN_EXPANSION_TAG:
case Collation::BUILDER_DATA_TAG:
case Collation::PREFIX_TAG:
case Collation::CONTRACTION_TAG:
case Collation::HANGUL_TAG:
case Collation::LEAD_SURROGATE_TAG:
errorCode = U_UNSUPPORTED_ERROR;
return 0;
case Collation::FALLBACK_TAG:
case Collation::RESERVED_TAG_3:
errorCode = U_INTERNAL_PROGRAM_ERROR;
return 0;
case Collation::LONG_PRIMARY_TAG:
return Collation::ceFromLongPrimaryCE32(ce32);
case Collation::LONG_SECONDARY_TAG:
return Collation::ceFromLongSecondaryCE32(ce32);
case Collation::EXPANSION32_TAG:
if(Collation::lengthFromCE32(ce32) == 1) {
ce32 = d->ce32s[Collation::indexFromCE32(ce32)];
break;
} else {
errorCode = U_UNSUPPORTED_ERROR;
return 0;
}
case Collation::EXPANSION_TAG: {
if(Collation::lengthFromCE32(ce32) == 1) {
return d->ces[Collation::indexFromCE32(ce32)];
} else {
errorCode = U_UNSUPPORTED_ERROR;
return 0;
}
}
case Collation::DIGIT_TAG:
// Fetch the non-numeric-collation CE32 and continue.
ce32 = d->ce32s[Collation::indexFromCE32(ce32)];
break;
case Collation::U0000_TAG:
U_ASSERT(c == 0);
// Fetch the normal ce32 for U+0000 and continue.
ce32 = d->ce32s[0];
break;
case Collation::OFFSET_TAG:
return d->getCEFromOffsetCE32(c, ce32);
case Collation::IMPLICIT_TAG:
return Collation::unassignedCEFromCodePoint(c);
}
}
return Collation::ceFromSimpleCE32(ce32);
}
uint32_t
CollationData::getFirstPrimaryForGroup(int32_t script) const {
int32_t index = getScriptIndex(script);
return index == 0 ? 0 : (uint32_t)scriptStarts[index] << 16;
}
uint32_t
CollationData::getLastPrimaryForGroup(int32_t script) const {
int32_t index = getScriptIndex(script);
if(index == 0) {
return 0;
}
uint32_t limit = scriptStarts[index + 1];
return (limit << 16) - 1;
}
int32_t
CollationData::getGroupForPrimary(uint32_t p) const {
p >>= 16;
if(p < scriptStarts[1] || scriptStarts[scriptStartsLength - 1] <= p) {
return -1;
}
int32_t index = 1;
while(p >= scriptStarts[index + 1]) { ++index; }
for(int32_t i = 0; i < numScripts; ++i) {
if(scriptsIndex[i] == index) {
return i;
}
}
for(int32_t i = 0; i < MAX_NUM_SPECIAL_REORDER_CODES; ++i) {
if(scriptsIndex[numScripts + i] == index) {
return UCOL_REORDER_CODE_FIRST + i;
}
}
return -1;
}
int32_t
CollationData::getScriptIndex(int32_t script) const {
if(script < 0) {
return 0;
} else if(script < numScripts) {
return scriptsIndex[script];
} else if(script < UCOL_REORDER_CODE_FIRST) {
return 0;
} else {
script -= UCOL_REORDER_CODE_FIRST;
if(script < MAX_NUM_SPECIAL_REORDER_CODES) {
return scriptsIndex[numScripts + script];
} else {
return 0;
}
}
}
int32_t
CollationData::getEquivalentScripts(int32_t script,
int32_t dest[], int32_t capacity,
UErrorCode &errorCode) const {
if(U_FAILURE(errorCode)) { return 0; }
int32_t index = getScriptIndex(script);
if(index == 0) { return 0; }
if(script >= UCOL_REORDER_CODE_FIRST) {
// Special groups have no aliases.
if(capacity > 0) {
dest[0] = script;
} else {
errorCode = U_BUFFER_OVERFLOW_ERROR;
}
return 1;
}
int32_t length = 0;
for(int32_t i = 0; i < numScripts; ++i) {
if(scriptsIndex[i] == index) {
if(length < capacity) {
dest[length] = i;
}
++length;
}
}
if(length > capacity) {
errorCode = U_BUFFER_OVERFLOW_ERROR;
}
return length;
}
void
CollationData::makeReorderRanges(const int32_t *reorder, int32_t length,
UVector32 &ranges, UErrorCode &errorCode) const {
makeReorderRanges(reorder, length, FALSE, ranges, errorCode);
}
void
CollationData::makeReorderRanges(const int32_t *reorder, int32_t length,
UBool latinMustMove,
UVector32 &ranges, UErrorCode &errorCode) const {
if(U_FAILURE(errorCode)) { return; }
ranges.removeAllElements();
if(length == 0 || (length == 1 && reorder[0] == USCRIPT_UNKNOWN)) {
return;
}
// Maps each script-or-group range to a new lead byte.
uint8_t table[MAX_NUM_SCRIPT_RANGES];
uprv_memset(table, 0, sizeof(table));
{
// Set "don't care" values for reserved ranges.
int32_t index = scriptsIndex[
numScripts + REORDER_RESERVED_BEFORE_LATIN - UCOL_REORDER_CODE_FIRST];
if(index != 0) {
table[index] = 0xff;
}
index = scriptsIndex[
numScripts + REORDER_RESERVED_AFTER_LATIN - UCOL_REORDER_CODE_FIRST];
if(index != 0) {
table[index] = 0xff;
}
}
// Never reorder special low and high primary lead bytes.
U_ASSERT(scriptStartsLength >= 2);
U_ASSERT(scriptStarts[0] == 0);
int32_t lowStart = scriptStarts[1];
U_ASSERT(lowStart == ((Collation::MERGE_SEPARATOR_BYTE + 1) << 8));
int32_t highLimit = scriptStarts[scriptStartsLength - 1];
U_ASSERT(highLimit == (Collation::TRAIL_WEIGHT_BYTE << 8));
// Get the set of special reorder codes in the input list.
// This supports a fixed number of special reorder codes;
// it works for data with codes beyond UCOL_REORDER_CODE_LIMIT.
uint32_t specials = 0;
for(int32_t i = 0; i < length; ++i) {
int32_t reorderCode = reorder[i] - UCOL_REORDER_CODE_FIRST;
if(0 <= reorderCode && reorderCode < MAX_NUM_SPECIAL_REORDER_CODES) {
specials |= (uint32_t)1 << reorderCode;
}
}
// Start the reordering with the special low reorder codes that do not occur in the input.
for(int32_t i = 0; i < MAX_NUM_SPECIAL_REORDER_CODES; ++i) {
int32_t index = scriptsIndex[numScripts + i];
if(index != 0 && (specials & ((uint32_t)1 << i)) == 0) {
lowStart = addLowScriptRange(table, index, lowStart);
}
}
// Skip the reserved range before Latin if Latin is the first script,
// so that we do not move it unnecessarily.
int32_t skippedReserved = 0;
if(specials == 0 && reorder[0] == USCRIPT_LATIN && !latinMustMove) {
int32_t index = scriptsIndex[USCRIPT_LATIN];
U_ASSERT(index != 0);
int32_t start = scriptStarts[index];
U_ASSERT(lowStart <= start);
skippedReserved = start - lowStart;
lowStart = start;
}
// Reorder according to the input scripts, continuing from the bottom of the primary range.
int32_t originalLength = length; // length will be decremented if "others" is in the list.
UBool hasReorderToEnd = FALSE;
for(int32_t i = 0; i < length;) {
int32_t script = reorder[i++];
if(script == USCRIPT_UNKNOWN) {
// Put the remaining scripts at the top.
hasReorderToEnd = TRUE;
while(i < length) {
script = reorder[--length];
if(script == USCRIPT_UNKNOWN || // Must occur at most once.
script == UCOL_REORDER_CODE_DEFAULT) {
errorCode = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
int32_t index = getScriptIndex(script);
if(index == 0) { continue; }
if(table[index] != 0) { // Duplicate or equivalent script.
errorCode = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
highLimit = addHighScriptRange(table, index, highLimit);
}
break;
}
if(script == UCOL_REORDER_CODE_DEFAULT) {
// The default code must be the only one in the list, and that is handled by the caller.
// Otherwise it must not be used.
errorCode = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
int32_t index = getScriptIndex(script);
if(index == 0) { continue; }
if(table[index] != 0) { // Duplicate or equivalent script.
errorCode = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
lowStart = addLowScriptRange(table, index, lowStart);
}
// Put all remaining scripts into the middle.
for(int32_t i = 1; i < scriptStartsLength - 1; ++i) {
int32_t leadByte = table[i];
if(leadByte != 0) { continue; }
int32_t start = scriptStarts[i];
if(!hasReorderToEnd && start > lowStart) {
// No need to move this script.
lowStart = start;
}
lowStart = addLowScriptRange(table, i, lowStart);
}
if(lowStart > highLimit) {
if((lowStart - (skippedReserved & 0xff00)) <= highLimit) {
// Try not skipping the before-Latin reserved range.
makeReorderRanges(reorder, originalLength, TRUE, ranges, errorCode);
return;
}
// We need more primary lead bytes than available, despite the reserved ranges.
errorCode = U_BUFFER_OVERFLOW_ERROR;
return;
}
// Turn lead bytes into a list of (limit, offset) pairs.
// Encode each pair in one list element:
// Upper 16 bits = limit, lower 16 = signed lead byte offset.
int32_t offset = 0;
for(int32_t i = 1;; ++i) {
int32_t nextOffset = offset;
while(i < scriptStartsLength - 1) {
int32_t newLeadByte = table[i];
if(newLeadByte == 0xff) {
// "Don't care" lead byte for reserved range, continue with current offset.
} else {
nextOffset = newLeadByte - (scriptStarts[i] >> 8);
if(nextOffset != offset) { break; }
}
++i;
}
if(offset != 0 || i < scriptStartsLength - 1) {
ranges.addElement(((int32_t)scriptStarts[i] << 16) | (offset & 0xffff), errorCode);
}
if(i == scriptStartsLength - 1) { break; }
offset = nextOffset;
}
}
int32_t
CollationData::addLowScriptRange(uint8_t table[], int32_t index, int32_t lowStart) const {
int32_t start = scriptStarts[index];
if((start & 0xff) < (lowStart & 0xff)) {
lowStart += 0x100;
}
table[index] = (uint8_t)(lowStart >> 8);
int32_t limit = scriptStarts[index + 1];
lowStart = ((lowStart & 0xff00) + ((limit & 0xff00) - (start & 0xff00))) | (limit & 0xff);
return lowStart;
}
int32_t
CollationData::addHighScriptRange(uint8_t table[], int32_t index, int32_t highLimit) const {
int32_t limit = scriptStarts[index + 1];
if((limit & 0xff) > (highLimit & 0xff)) {
highLimit -= 0x100;
}
int32_t start = scriptStarts[index];
highLimit = ((highLimit & 0xff00) - ((limit & 0xff00) - (start & 0xff00))) | (start & 0xff);
table[index] = (uint8_t)(highLimit >> 8);
return highLimit;
}
U_NAMESPACE_END
#endif // !UCONFIG_NO_COLLATION