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