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474 lines
15 KiB
474 lines
15 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) 1996-2014, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*/
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/*
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* File coleitr.cpp
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*
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* Created by: Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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*
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* 6/23/97 helena Adding comments to make code more readable.
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* 08/03/98 erm Synched with 1.2 version of CollationElementIterator.java
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* 12/10/99 aliu Ported Thai collation support from Java.
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* 01/25/01 swquek Modified to a C++ wrapper calling C APIs (ucoliter.h)
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* 02/19/01 swquek Removed CollationElementIterator() since it is
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* private constructor and no calls are made to it
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* 2012-2014 markus Rewritten in C++ again.
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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/chariter.h"
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#include "unicode/coleitr.h"
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#include "unicode/tblcoll.h"
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#include "unicode/ustring.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 "collationiterator.h"
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#include "collationsets.h"
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#include "collationtailoring.h"
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#include "uassert.h"
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#include "uhash.h"
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#include "utf16collationiterator.h"
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#include "uvectr32.h"
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/* Constants --------------------------------------------------------------- */
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(CollationElementIterator)
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/* CollationElementIterator public constructor/destructor ------------------ */
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CollationElementIterator::CollationElementIterator(
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const CollationElementIterator& other)
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: UObject(other), iter_(NULL), rbc_(NULL), otherHalf_(0), dir_(0), offsets_(NULL) {
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*this = other;
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}
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CollationElementIterator::~CollationElementIterator()
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{
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delete iter_;
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delete offsets_;
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}
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/* CollationElementIterator public methods --------------------------------- */
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namespace {
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uint32_t getFirstHalf(uint32_t p, uint32_t lower32) {
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return (p & 0xffff0000) | ((lower32 >> 16) & 0xff00) | ((lower32 >> 8) & 0xff);
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}
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uint32_t getSecondHalf(uint32_t p, uint32_t lower32) {
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return (p << 16) | ((lower32 >> 8) & 0xff00) | (lower32 & 0x3f);
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}
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UBool ceNeedsTwoParts(int64_t ce) {
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return (ce & INT64_C(0xffff00ff003f)) != 0;
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}
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} // namespace
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int32_t CollationElementIterator::getOffset() const
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{
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if (dir_ < 0 && offsets_ != NULL && !offsets_->isEmpty()) {
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// CollationIterator::previousCE() decrements the CEs length
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// while it pops CEs from its internal buffer.
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int32_t i = iter_->getCEsLength();
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if (otherHalf_ != 0) {
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// Return the trailing CE offset while we are in the middle of a 64-bit CE.
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++i;
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}
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U_ASSERT(i < offsets_->size());
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return offsets_->elementAti(i);
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}
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return iter_->getOffset();
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}
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/**
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* Get the ordering priority of the next character in the string.
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* @return the next character's ordering. Returns NULLORDER if an error has
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* occured or if the end of string has been reached
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*/
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int32_t CollationElementIterator::next(UErrorCode& status)
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{
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if (U_FAILURE(status)) { return NULLORDER; }
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if (dir_ > 1) {
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// Continue forward iteration. Test this first.
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if (otherHalf_ != 0) {
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uint32_t oh = otherHalf_;
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otherHalf_ = 0;
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return oh;
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}
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} else if (dir_ == 1) {
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// next() after setOffset()
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dir_ = 2;
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} else if (dir_ == 0) {
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// The iter_ is already reset to the start of the text.
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dir_ = 2;
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} else /* dir_ < 0 */ {
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// illegal change of direction
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status = U_INVALID_STATE_ERROR;
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return NULLORDER;
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}
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// No need to keep all CEs in the buffer when we iterate.
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iter_->clearCEsIfNoneRemaining();
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int64_t ce = iter_->nextCE(status);
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if (ce == Collation::NO_CE) { return NULLORDER; }
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// Turn the 64-bit CE into two old-style 32-bit CEs, without quaternary bits.
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uint32_t p = (uint32_t)(ce >> 32);
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uint32_t lower32 = (uint32_t)ce;
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uint32_t firstHalf = getFirstHalf(p, lower32);
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uint32_t secondHalf = getSecondHalf(p, lower32);
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if (secondHalf != 0) {
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otherHalf_ = secondHalf | 0xc0; // continuation CE
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}
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return firstHalf;
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}
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UBool CollationElementIterator::operator!=(
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const CollationElementIterator& other) const
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{
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return !(*this == other);
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}
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UBool CollationElementIterator::operator==(
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const CollationElementIterator& that) const
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{
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if (this == &that) {
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return TRUE;
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}
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return
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(rbc_ == that.rbc_ || *rbc_ == *that.rbc_) &&
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otherHalf_ == that.otherHalf_ &&
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normalizeDir() == that.normalizeDir() &&
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string_ == that.string_ &&
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*iter_ == *that.iter_;
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}
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/**
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* Get the ordering priority of the previous collation element in the string.
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* @param status the error code status.
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* @return the previous element's ordering. Returns NULLORDER if an error has
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* occured or if the start of string has been reached.
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*/
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int32_t CollationElementIterator::previous(UErrorCode& status)
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{
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if (U_FAILURE(status)) { return NULLORDER; }
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if (dir_ < 0) {
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// Continue backwards iteration. Test this first.
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if (otherHalf_ != 0) {
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uint32_t oh = otherHalf_;
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otherHalf_ = 0;
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return oh;
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}
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} else if (dir_ == 0) {
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iter_->resetToOffset(string_.length());
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dir_ = -1;
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} else if (dir_ == 1) {
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// previous() after setOffset()
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dir_ = -1;
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} else /* dir_ > 1 */ {
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// illegal change of direction
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status = U_INVALID_STATE_ERROR;
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return NULLORDER;
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}
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if (offsets_ == NULL) {
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offsets_ = new UVector32(status);
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if (offsets_ == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return NULLORDER;
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}
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}
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// If we already have expansion CEs, then we also have offsets.
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// Otherwise remember the trailing offset in case we need to
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// write offsets for an artificial expansion.
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int32_t limitOffset = iter_->getCEsLength() == 0 ? iter_->getOffset() : 0;
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int64_t ce = iter_->previousCE(*offsets_, status);
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if (ce == Collation::NO_CE) { return NULLORDER; }
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// Turn the 64-bit CE into two old-style 32-bit CEs, without quaternary bits.
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uint32_t p = (uint32_t)(ce >> 32);
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uint32_t lower32 = (uint32_t)ce;
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uint32_t firstHalf = getFirstHalf(p, lower32);
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uint32_t secondHalf = getSecondHalf(p, lower32);
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if (secondHalf != 0) {
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if (offsets_->isEmpty()) {
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// When we convert a single 64-bit CE into two 32-bit CEs,
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// we need to make this artificial expansion behave like a normal expansion.
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// See CollationIterator::previousCE().
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offsets_->addElement(iter_->getOffset(), status);
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offsets_->addElement(limitOffset, status);
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}
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otherHalf_ = firstHalf;
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return secondHalf | 0xc0; // continuation CE
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}
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return firstHalf;
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}
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/**
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* Resets the cursor to the beginning of the string.
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*/
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void CollationElementIterator::reset()
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{
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iter_ ->resetToOffset(0);
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otherHalf_ = 0;
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dir_ = 0;
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}
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void CollationElementIterator::setOffset(int32_t newOffset,
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UErrorCode& status)
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{
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if (U_FAILURE(status)) { return; }
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if (0 < newOffset && newOffset < string_.length()) {
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int32_t offset = newOffset;
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do {
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UChar c = string_.charAt(offset);
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if (!rbc_->isUnsafe(c) ||
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(U16_IS_LEAD(c) && !rbc_->isUnsafe(string_.char32At(offset)))) {
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break;
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}
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// Back up to before this unsafe character.
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--offset;
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} while (offset > 0);
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if (offset < newOffset) {
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// We might have backed up more than necessary.
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// For example, contractions "ch" and "cu" make both 'h' and 'u' unsafe,
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// but for text "chu" setOffset(2) should remain at 2
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// although we initially back up to offset 0.
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// Find the last safe offset no greater than newOffset by iterating forward.
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int32_t lastSafeOffset = offset;
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do {
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iter_->resetToOffset(lastSafeOffset);
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do {
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iter_->nextCE(status);
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if (U_FAILURE(status)) { return; }
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} while ((offset = iter_->getOffset()) == lastSafeOffset);
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if (offset <= newOffset) {
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lastSafeOffset = offset;
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}
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} while (offset < newOffset);
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newOffset = lastSafeOffset;
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}
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}
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iter_->resetToOffset(newOffset);
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otherHalf_ = 0;
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dir_ = 1;
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}
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/**
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* Sets the source to the new source string.
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*/
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void CollationElementIterator::setText(const UnicodeString& source,
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UErrorCode& status)
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{
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if (U_FAILURE(status)) {
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return;
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}
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string_ = source;
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const UChar *s = string_.getBuffer();
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CollationIterator *newIter;
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UBool numeric = rbc_->settings->isNumeric();
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if (rbc_->settings->dontCheckFCD()) {
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newIter = new UTF16CollationIterator(rbc_->data, numeric, s, s, s + string_.length());
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} else {
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newIter = new FCDUTF16CollationIterator(rbc_->data, numeric, s, s, s + string_.length());
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}
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if (newIter == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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delete iter_;
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iter_ = newIter;
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otherHalf_ = 0;
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dir_ = 0;
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}
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// Sets the source to the new character iterator.
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void CollationElementIterator::setText(CharacterIterator& source,
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UErrorCode& status)
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{
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if (U_FAILURE(status))
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return;
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source.getText(string_);
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setText(string_, status);
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}
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int32_t CollationElementIterator::strengthOrder(int32_t order) const
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{
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UColAttributeValue s = (UColAttributeValue)rbc_->settings->getStrength();
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// Mask off the unwanted differences.
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if (s == UCOL_PRIMARY) {
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order &= 0xffff0000;
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}
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else if (s == UCOL_SECONDARY) {
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order &= 0xffffff00;
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}
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return order;
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}
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/* CollationElementIterator private constructors/destructors --------------- */
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/**
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* This is the "real" constructor for this class; it constructs an iterator
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* over the source text using the specified collator
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*/
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CollationElementIterator::CollationElementIterator(
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const UnicodeString &source,
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const RuleBasedCollator *coll,
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UErrorCode &status)
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: iter_(NULL), rbc_(coll), otherHalf_(0), dir_(0), offsets_(NULL) {
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setText(source, status);
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}
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/**
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* This is the "real" constructor for this class; it constructs an iterator over
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* the source text using the specified collator
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*/
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CollationElementIterator::CollationElementIterator(
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const CharacterIterator &source,
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const RuleBasedCollator *coll,
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UErrorCode &status)
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: iter_(NULL), rbc_(coll), otherHalf_(0), dir_(0), offsets_(NULL) {
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// We only call source.getText() which should be const anyway.
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setText(const_cast<CharacterIterator &>(source), status);
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}
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/* CollationElementIterator private methods -------------------------------- */
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const CollationElementIterator& CollationElementIterator::operator=(
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const CollationElementIterator& other)
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{
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if (this == &other) {
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return *this;
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}
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CollationIterator *newIter;
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const FCDUTF16CollationIterator *otherFCDIter =
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dynamic_cast<const FCDUTF16CollationIterator *>(other.iter_);
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if(otherFCDIter != NULL) {
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newIter = new FCDUTF16CollationIterator(*otherFCDIter, string_.getBuffer());
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} else {
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const UTF16CollationIterator *otherIter =
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dynamic_cast<const UTF16CollationIterator *>(other.iter_);
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if(otherIter != NULL) {
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newIter = new UTF16CollationIterator(*otherIter, string_.getBuffer());
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} else {
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newIter = NULL;
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}
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}
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if(newIter != NULL) {
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delete iter_;
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iter_ = newIter;
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rbc_ = other.rbc_;
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otherHalf_ = other.otherHalf_;
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dir_ = other.dir_;
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string_ = other.string_;
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}
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if(other.dir_ < 0 && other.offsets_ != NULL && !other.offsets_->isEmpty()) {
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UErrorCode errorCode = U_ZERO_ERROR;
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if(offsets_ == NULL) {
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offsets_ = new UVector32(other.offsets_->size(), errorCode);
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}
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if(offsets_ != NULL) {
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offsets_->assign(*other.offsets_, errorCode);
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}
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}
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return *this;
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}
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namespace {
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class MaxExpSink : public ContractionsAndExpansions::CESink {
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public:
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MaxExpSink(UHashtable *h, UErrorCode &ec) : maxExpansions(h), errorCode(ec) {}
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virtual ~MaxExpSink();
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virtual void handleCE(int64_t /*ce*/) {}
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virtual void handleExpansion(const int64_t ces[], int32_t length) {
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if (length <= 1) {
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// We do not need to add single CEs into the map.
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return;
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}
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int32_t count = 0; // number of CE "halves"
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for (int32_t i = 0; i < length; ++i) {
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count += ceNeedsTwoParts(ces[i]) ? 2 : 1;
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}
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// last "half" of the last CE
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int64_t ce = ces[length - 1];
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uint32_t p = (uint32_t)(ce >> 32);
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uint32_t lower32 = (uint32_t)ce;
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uint32_t lastHalf = getSecondHalf(p, lower32);
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if (lastHalf == 0) {
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lastHalf = getFirstHalf(p, lower32);
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U_ASSERT(lastHalf != 0);
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} else {
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lastHalf |= 0xc0; // old-style continuation CE
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}
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if (count > uhash_igeti(maxExpansions, (int32_t)lastHalf)) {
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uhash_iputi(maxExpansions, (int32_t)lastHalf, count, &errorCode);
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}
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}
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private:
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UHashtable *maxExpansions;
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UErrorCode &errorCode;
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};
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MaxExpSink::~MaxExpSink() {}
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} // namespace
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UHashtable *
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CollationElementIterator::computeMaxExpansions(const CollationData *data, UErrorCode &errorCode) {
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if (U_FAILURE(errorCode)) { return NULL; }
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UHashtable *maxExpansions = uhash_open(uhash_hashLong, uhash_compareLong,
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uhash_compareLong, &errorCode);
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if (U_FAILURE(errorCode)) { return NULL; }
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MaxExpSink sink(maxExpansions, errorCode);
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ContractionsAndExpansions(NULL, NULL, &sink, TRUE).forData(data, errorCode);
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if (U_FAILURE(errorCode)) {
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uhash_close(maxExpansions);
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return NULL;
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}
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return maxExpansions;
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}
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int32_t
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CollationElementIterator::getMaxExpansion(int32_t order) const {
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return getMaxExpansion(rbc_->tailoring->maxExpansions, order);
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}
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int32_t
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CollationElementIterator::getMaxExpansion(const UHashtable *maxExpansions, int32_t order) {
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if (order == 0) { return 1; }
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int32_t max;
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if(maxExpansions != NULL && (max = uhash_igeti(maxExpansions, order)) != 0) {
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return max;
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}
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if ((order & 0xc0) == 0xc0) {
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// old-style continuation CE
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return 2;
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} else {
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return 1;
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}
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_COLLATION */
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