656 lines
24 KiB
C++
656 lines
24 KiB
C++
// Copyright (C) 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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// file: rbbi_cache.cpp
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_BREAK_ITERATION
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#include "unicode/ubrk.h"
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#include "unicode/rbbi.h"
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#include "rbbi_cache.h"
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#include "brkeng.h"
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#include "cmemory.h"
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#include "rbbidata.h"
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#include "rbbirb.h"
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#include "uassert.h"
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#include "uvectr32.h"
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U_NAMESPACE_BEGIN
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/*
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* DictionaryCache implementation
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*/
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RuleBasedBreakIterator::DictionaryCache::DictionaryCache(RuleBasedBreakIterator *bi, UErrorCode &status) :
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fBI(bi), fBreaks(status), fPositionInCache(-1),
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fStart(0), fLimit(0), fFirstRuleStatusIndex(0), fOtherRuleStatusIndex(0) {
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}
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RuleBasedBreakIterator::DictionaryCache::~DictionaryCache() {
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}
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void RuleBasedBreakIterator::DictionaryCache::reset() {
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fPositionInCache = -1;
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fStart = 0;
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fLimit = 0;
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fFirstRuleStatusIndex = 0;
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fOtherRuleStatusIndex = 0;
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fBreaks.removeAllElements();
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}
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UBool RuleBasedBreakIterator::DictionaryCache::following(int32_t fromPos, int32_t *result, int32_t *statusIndex) {
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if (fromPos >= fLimit || fromPos < fStart) {
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fPositionInCache = -1;
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return FALSE;
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}
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// Sequential iteration, move from previous boundary to the following
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int32_t r = 0;
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if (fPositionInCache >= 0 && fPositionInCache < fBreaks.size() && fBreaks.elementAti(fPositionInCache) == fromPos) {
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++fPositionInCache;
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if (fPositionInCache >= fBreaks.size()) {
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fPositionInCache = -1;
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return FALSE;
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}
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r = fBreaks.elementAti(fPositionInCache);
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U_ASSERT(r > fromPos);
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*result = r;
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*statusIndex = fOtherRuleStatusIndex;
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return TRUE;
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}
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// Random indexing. Linear search for the boundary following the given position.
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for (fPositionInCache = 0; fPositionInCache < fBreaks.size(); ++fPositionInCache) {
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r= fBreaks.elementAti(fPositionInCache);
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if (r > fromPos) {
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*result = r;
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*statusIndex = fOtherRuleStatusIndex;
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return TRUE;
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}
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}
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UPRV_UNREACHABLE;
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}
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UBool RuleBasedBreakIterator::DictionaryCache::preceding(int32_t fromPos, int32_t *result, int32_t *statusIndex) {
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if (fromPos <= fStart || fromPos > fLimit) {
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fPositionInCache = -1;
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return FALSE;
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}
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if (fromPos == fLimit) {
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fPositionInCache = fBreaks.size() - 1;
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if (fPositionInCache >= 0) {
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U_ASSERT(fBreaks.elementAti(fPositionInCache) == fromPos);
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}
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}
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int32_t r;
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if (fPositionInCache > 0 && fPositionInCache < fBreaks.size() && fBreaks.elementAti(fPositionInCache) == fromPos) {
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--fPositionInCache;
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r = fBreaks.elementAti(fPositionInCache);
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U_ASSERT(r < fromPos);
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*result = r;
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*statusIndex = ( r== fStart) ? fFirstRuleStatusIndex : fOtherRuleStatusIndex;
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return TRUE;
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}
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if (fPositionInCache == 0) {
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fPositionInCache = -1;
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return FALSE;
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}
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for (fPositionInCache = fBreaks.size()-1; fPositionInCache >= 0; --fPositionInCache) {
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r = fBreaks.elementAti(fPositionInCache);
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if (r < fromPos) {
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*result = r;
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*statusIndex = ( r == fStart) ? fFirstRuleStatusIndex : fOtherRuleStatusIndex;
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return TRUE;
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}
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}
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UPRV_UNREACHABLE;
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}
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void RuleBasedBreakIterator::DictionaryCache::populateDictionary(int32_t startPos, int32_t endPos,
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int32_t firstRuleStatus, int32_t otherRuleStatus) {
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if ((endPos - startPos) <= 1) {
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return;
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}
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reset();
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fFirstRuleStatusIndex = firstRuleStatus;
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fOtherRuleStatusIndex = otherRuleStatus;
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int32_t rangeStart = startPos;
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int32_t rangeEnd = endPos;
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uint16_t category;
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int32_t current;
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UErrorCode status = U_ZERO_ERROR;
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int32_t foundBreakCount = 0;
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UText *text = &fBI->fText;
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// Loop through the text, looking for ranges of dictionary characters.
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// For each span, find the appropriate break engine, and ask it to find
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// any breaks within the span.
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utext_setNativeIndex(text, rangeStart);
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UChar32 c = utext_current32(text);
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category = ucptrie_get(fBI->fData->fTrie, c);
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uint32_t dictStart = fBI->fData->fForwardTable->fDictCategoriesStart;
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while(U_SUCCESS(status)) {
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while((current = (int32_t)UTEXT_GETNATIVEINDEX(text)) < rangeEnd
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&& (category < dictStart)) {
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utext_next32(text); // TODO: cleaner loop structure.
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c = utext_current32(text);
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category = ucptrie_get(fBI->fData->fTrie, c);
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}
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if (current >= rangeEnd) {
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break;
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}
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// We now have a dictionary character. Get the appropriate language object
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// to deal with it.
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const LanguageBreakEngine *lbe = fBI->getLanguageBreakEngine(c);
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// Ask the language object if there are any breaks. It will add them to the cache and
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// leave the text pointer on the other side of its range, ready to search for the next one.
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if (lbe != NULL) {
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foundBreakCount += lbe->findBreaks(text, rangeStart, rangeEnd, fBreaks);
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}
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// Reload the loop variables for the next go-round
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c = utext_current32(text);
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category = ucptrie_get(fBI->fData->fTrie, c);
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}
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// If we found breaks, ensure that the first and last entries are
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// the original starting and ending position. And initialize the
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// cache iteration position to the first entry.
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// printf("foundBreakCount = %d\n", foundBreakCount);
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if (foundBreakCount > 0) {
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U_ASSERT(foundBreakCount == fBreaks.size());
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if (startPos < fBreaks.elementAti(0)) {
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// The dictionary did not place a boundary at the start of the segment of text.
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// Add one now. This should not commonly happen, but it would be easy for interactions
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// of the rules for dictionary segments and the break engine implementations to
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// inadvertently cause it. Cover it here, just in case.
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fBreaks.insertElementAt(startPos, 0, status);
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}
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if (endPos > fBreaks.peeki()) {
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fBreaks.push(endPos, status);
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}
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fPositionInCache = 0;
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// Note: Dictionary matching may extend beyond the original limit.
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fStart = fBreaks.elementAti(0);
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fLimit = fBreaks.peeki();
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} else {
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// there were no language-based breaks, even though the segment contained
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// dictionary characters. Subsequent attempts to fetch boundaries from the dictionary cache
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// for this range will fail, and the calling code will fall back to the rule based boundaries.
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}
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}
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/*
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* BreakCache implemetation
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*/
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RuleBasedBreakIterator::BreakCache::BreakCache(RuleBasedBreakIterator *bi, UErrorCode &status) :
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fBI(bi), fSideBuffer(status) {
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reset();
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}
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RuleBasedBreakIterator::BreakCache::~BreakCache() {
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}
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void RuleBasedBreakIterator::BreakCache::reset(int32_t pos, int32_t ruleStatus) {
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fStartBufIdx = 0;
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fEndBufIdx = 0;
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fTextIdx = pos;
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fBufIdx = 0;
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fBoundaries[0] = pos;
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fStatuses[0] = (uint16_t)ruleStatus;
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}
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int32_t RuleBasedBreakIterator::BreakCache::current() {
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fBI->fPosition = fTextIdx;
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fBI->fRuleStatusIndex = fStatuses[fBufIdx];
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fBI->fDone = FALSE;
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return fTextIdx;
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}
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void RuleBasedBreakIterator::BreakCache::following(int32_t startPos, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return;
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}
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if (startPos == fTextIdx || seek(startPos) || populateNear(startPos, status)) {
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// startPos is in the cache. Do a next() from that position.
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// TODO: an awkward set of interactions with bi->fDone
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// seek() does not clear it; it can't because of interactions with populateNear().
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// next() does not clear it in the fast-path case, where everything matters. Maybe it should.
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// So clear it here, for the case where seek() succeeded on an iterator that had previously run off the end.
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fBI->fDone = false;
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next();
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}
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return;
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}
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void RuleBasedBreakIterator::BreakCache::preceding(int32_t startPos, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return;
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}
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if (startPos == fTextIdx || seek(startPos) || populateNear(startPos, status)) {
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if (startPos == fTextIdx) {
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previous(status);
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} else {
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// seek() leaves the BreakCache positioned at the preceding boundary
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// if the requested position is between two boundaries.
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// current() pushes the BreakCache position out to the BreakIterator itself.
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U_ASSERT(startPos > fTextIdx);
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current();
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}
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}
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return;
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}
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/*
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* Out-of-line code for BreakCache::next().
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* Cache does not already contain the boundary
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*/
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void RuleBasedBreakIterator::BreakCache::nextOL() {
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fBI->fDone = !populateFollowing();
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fBI->fPosition = fTextIdx;
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fBI->fRuleStatusIndex = fStatuses[fBufIdx];
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return;
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}
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void RuleBasedBreakIterator::BreakCache::previous(UErrorCode &status) {
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if (U_FAILURE(status)) {
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return;
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}
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int32_t initialBufIdx = fBufIdx;
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if (fBufIdx == fStartBufIdx) {
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// At start of cache. Prepend to it.
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populatePreceding(status);
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} else {
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// Cache already holds the next boundary
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fBufIdx = modChunkSize(fBufIdx - 1);
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fTextIdx = fBoundaries[fBufIdx];
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}
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fBI->fDone = (fBufIdx == initialBufIdx);
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fBI->fPosition = fTextIdx;
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fBI->fRuleStatusIndex = fStatuses[fBufIdx];
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return;
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}
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UBool RuleBasedBreakIterator::BreakCache::seek(int32_t pos) {
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if (pos < fBoundaries[fStartBufIdx] || pos > fBoundaries[fEndBufIdx]) {
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return FALSE;
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}
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if (pos == fBoundaries[fStartBufIdx]) {
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// Common case: seek(0), from BreakIterator::first()
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fBufIdx = fStartBufIdx;
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fTextIdx = fBoundaries[fBufIdx];
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return TRUE;
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}
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if (pos == fBoundaries[fEndBufIdx]) {
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fBufIdx = fEndBufIdx;
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fTextIdx = fBoundaries[fBufIdx];
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return TRUE;
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}
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int32_t min = fStartBufIdx;
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int32_t max = fEndBufIdx;
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while (min != max) {
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int32_t probe = (min + max + (min>max ? CACHE_SIZE : 0)) / 2;
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probe = modChunkSize(probe);
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if (fBoundaries[probe] > pos) {
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max = probe;
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} else {
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min = modChunkSize(probe + 1);
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}
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}
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U_ASSERT(fBoundaries[max] > pos);
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fBufIdx = modChunkSize(max - 1);
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fTextIdx = fBoundaries[fBufIdx];
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U_ASSERT(fTextIdx <= pos);
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return TRUE;
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}
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UBool RuleBasedBreakIterator::BreakCache::populateNear(int32_t position, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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U_ASSERT(position < fBoundaries[fStartBufIdx] || position > fBoundaries[fEndBufIdx]);
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// Find a boundary somewhere in the vicinity of the requested position.
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// Depending on the safe rules and the text data, it could be either before, at, or after
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// the requested position.
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// If the requested position is not near already cached positions, clear the existing cache,
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// find a near-by boundary and begin new cache contents there.
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if ((position < fBoundaries[fStartBufIdx] - 15) || position > (fBoundaries[fEndBufIdx] + 15)) {
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int32_t aBoundary = 0;
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int32_t ruleStatusIndex = 0;
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if (position > 20) {
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int32_t backupPos = fBI->handleSafePrevious(position);
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if (backupPos > 0) {
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// Advance to the boundary following the backup position.
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// There is a complication: the safe reverse rules identify pairs of code points
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// that are safe. If advancing from the safe point moves forwards by less than
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// two code points, we need to advance one more time to ensure that the boundary
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// is good, including a correct rules status value.
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//
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fBI->fPosition = backupPos;
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aBoundary = fBI->handleNext();
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if (aBoundary <= backupPos + 4) {
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// +4 is a quick test for possibly having advanced only one codepoint.
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// Four being the length of the longest potential code point, a supplementary in UTF-8
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utext_setNativeIndex(&fBI->fText, aBoundary);
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if (backupPos == utext_getPreviousNativeIndex(&fBI->fText)) {
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// The initial handleNext() only advanced by a single code point. Go again.
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aBoundary = fBI->handleNext(); // Safe rules identify safe pairs.
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}
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}
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ruleStatusIndex = fBI->fRuleStatusIndex;
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}
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}
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reset(aBoundary, ruleStatusIndex); // Reset cache to hold aBoundary as a single starting point.
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}
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// Fill in boundaries between existing cache content and the new requested position.
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if (fBoundaries[fEndBufIdx] < position) {
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// The last position in the cache precedes the requested position.
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// Add following position(s) to the cache.
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while (fBoundaries[fEndBufIdx] < position) {
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if (!populateFollowing()) {
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UPRV_UNREACHABLE;
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}
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}
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fBufIdx = fEndBufIdx; // Set iterator position to the end of the buffer.
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fTextIdx = fBoundaries[fBufIdx]; // Required because populateFollowing may add extra boundaries.
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while (fTextIdx > position) { // Move backwards to a position at or preceding the requested pos.
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previous(status);
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}
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return true;
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}
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if (fBoundaries[fStartBufIdx] > position) {
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// The first position in the cache is beyond the requested position.
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// back up more until we get a boundary <= the requested position.
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while (fBoundaries[fStartBufIdx] > position) {
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populatePreceding(status);
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}
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fBufIdx = fStartBufIdx; // Set iterator position to the start of the buffer.
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fTextIdx = fBoundaries[fBufIdx]; // Required because populatePreceding may add extra boundaries.
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while (fTextIdx < position) { // Move forwards to a position at or following the requested pos.
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next();
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}
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if (fTextIdx > position) {
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// If position is not itself a boundary, the next() loop above will overshoot.
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// Back up one, leaving cache position at the boundary preceding the requested position.
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previous(status);
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}
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return true;
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}
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U_ASSERT(fTextIdx == position);
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return true;
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}
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UBool RuleBasedBreakIterator::BreakCache::populateFollowing() {
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int32_t fromPosition = fBoundaries[fEndBufIdx];
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int32_t fromRuleStatusIdx = fStatuses[fEndBufIdx];
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int32_t pos = 0;
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int32_t ruleStatusIdx = 0;
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if (fBI->fDictionaryCache->following(fromPosition, &pos, &ruleStatusIdx)) {
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addFollowing(pos, ruleStatusIdx, UpdateCachePosition);
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return TRUE;
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}
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fBI->fPosition = fromPosition;
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pos = fBI->handleNext();
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if (pos == UBRK_DONE) {
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return FALSE;
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}
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ruleStatusIdx = fBI->fRuleStatusIndex;
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if (fBI->fDictionaryCharCount > 0) {
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// The text segment obtained from the rules includes dictionary characters.
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// Subdivide it, with subdivided results going into the dictionary cache.
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fBI->fDictionaryCache->populateDictionary(fromPosition, pos, fromRuleStatusIdx, ruleStatusIdx);
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if (fBI->fDictionaryCache->following(fromPosition, &pos, &ruleStatusIdx)) {
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addFollowing(pos, ruleStatusIdx, UpdateCachePosition);
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return TRUE;
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// TODO: may want to move a sizable chunk of dictionary cache to break cache at this point.
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// But be careful with interactions with populateNear().
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}
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}
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// Rule based segment did not include dictionary characters.
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// Or, it did contain dictionary chars, but the dictionary segmenter didn't handle them,
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// meaning that we didn't take the return, above.
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// Add its end point to the cache.
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addFollowing(pos, ruleStatusIdx, UpdateCachePosition);
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// Add several non-dictionary boundaries at this point, to optimize straight forward iteration.
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// (subsequent calls to BreakIterator::next() will take the fast path, getting cached results.
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//
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for (int count=0; count<6; ++count) {
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pos = fBI->handleNext();
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if (pos == UBRK_DONE || fBI->fDictionaryCharCount > 0) {
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break;
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}
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addFollowing(pos, fBI->fRuleStatusIndex, RetainCachePosition);
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}
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return TRUE;
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}
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UBool RuleBasedBreakIterator::BreakCache::populatePreceding(UErrorCode &status) {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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int32_t fromPosition = fBoundaries[fStartBufIdx];
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if (fromPosition == 0) {
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return FALSE;
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}
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int32_t position = 0;
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int32_t positionStatusIdx = 0;
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if (fBI->fDictionaryCache->preceding(fromPosition, &position, &positionStatusIdx)) {
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addPreceding(position, positionStatusIdx, UpdateCachePosition);
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return TRUE;
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}
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int32_t backupPosition = fromPosition;
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// Find a boundary somewhere preceding the first already-cached boundary
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do {
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backupPosition = backupPosition - 30;
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if (backupPosition <= 0) {
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backupPosition = 0;
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} else {
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backupPosition = fBI->handleSafePrevious(backupPosition);
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}
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if (backupPosition == UBRK_DONE || backupPosition == 0) {
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position = 0;
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positionStatusIdx = 0;
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} else {
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// Advance to the boundary following the backup position.
|
|
// There is a complication: the safe reverse rules identify pairs of code points
|
|
// that are safe. If advancing from the safe point moves forwards by less than
|
|
// two code points, we need to advance one more time to ensure that the boundary
|
|
// is good, including a correct rules status value.
|
|
//
|
|
fBI->fPosition = backupPosition;
|
|
position = fBI->handleNext();
|
|
if (position <= backupPosition + 4) {
|
|
// +4 is a quick test for possibly having advanced only one codepoint.
|
|
// Four being the length of the longest potential code point, a supplementary in UTF-8
|
|
utext_setNativeIndex(&fBI->fText, position);
|
|
if (backupPosition == utext_getPreviousNativeIndex(&fBI->fText)) {
|
|
// The initial handleNext() only advanced by a single code point. Go again.
|
|
position = fBI->handleNext(); // Safe rules identify safe pairs.
|
|
}
|
|
}
|
|
positionStatusIdx = fBI->fRuleStatusIndex;
|
|
}
|
|
} while (position >= fromPosition);
|
|
|
|
// Find boundaries between the one we just located and the first already-cached boundary
|
|
// Put them in a side buffer, because we don't yet know where they will fall in the circular cache buffer..
|
|
|
|
fSideBuffer.removeAllElements();
|
|
fSideBuffer.addElement(position, status);
|
|
fSideBuffer.addElement(positionStatusIdx, status);
|
|
|
|
do {
|
|
int32_t prevPosition = fBI->fPosition = position;
|
|
int32_t prevStatusIdx = positionStatusIdx;
|
|
position = fBI->handleNext();
|
|
positionStatusIdx = fBI->fRuleStatusIndex;
|
|
if (position == UBRK_DONE) {
|
|
break;
|
|
}
|
|
|
|
UBool segmentHandledByDictionary = FALSE;
|
|
if (fBI->fDictionaryCharCount != 0) {
|
|
// Segment from the rules includes dictionary characters.
|
|
// Subdivide it, with subdivided results going into the dictionary cache.
|
|
int32_t dictSegEndPosition = position;
|
|
fBI->fDictionaryCache->populateDictionary(prevPosition, dictSegEndPosition, prevStatusIdx, positionStatusIdx);
|
|
while (fBI->fDictionaryCache->following(prevPosition, &position, &positionStatusIdx)) {
|
|
segmentHandledByDictionary = true;
|
|
U_ASSERT(position > prevPosition);
|
|
if (position >= fromPosition) {
|
|
break;
|
|
}
|
|
U_ASSERT(position <= dictSegEndPosition);
|
|
fSideBuffer.addElement(position, status);
|
|
fSideBuffer.addElement(positionStatusIdx, status);
|
|
prevPosition = position;
|
|
}
|
|
U_ASSERT(position==dictSegEndPosition || position>=fromPosition);
|
|
}
|
|
|
|
if (!segmentHandledByDictionary && position < fromPosition) {
|
|
fSideBuffer.addElement(position, status);
|
|
fSideBuffer.addElement(positionStatusIdx, status);
|
|
}
|
|
} while (position < fromPosition);
|
|
|
|
// Move boundaries from the side buffer to the main circular buffer.
|
|
UBool success = FALSE;
|
|
if (!fSideBuffer.isEmpty()) {
|
|
positionStatusIdx = fSideBuffer.popi();
|
|
position = fSideBuffer.popi();
|
|
addPreceding(position, positionStatusIdx, UpdateCachePosition);
|
|
success = TRUE;
|
|
}
|
|
|
|
while (!fSideBuffer.isEmpty()) {
|
|
positionStatusIdx = fSideBuffer.popi();
|
|
position = fSideBuffer.popi();
|
|
if (!addPreceding(position, positionStatusIdx, RetainCachePosition)) {
|
|
// No space in circular buffer to hold a new preceding result while
|
|
// also retaining the current cache (iteration) position.
|
|
// Bailing out is safe; the cache will refill again if needed.
|
|
break;
|
|
}
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
|
|
void RuleBasedBreakIterator::BreakCache::addFollowing(int32_t position, int32_t ruleStatusIdx, UpdatePositionValues update) {
|
|
U_ASSERT(position > fBoundaries[fEndBufIdx]);
|
|
U_ASSERT(ruleStatusIdx <= UINT16_MAX);
|
|
int32_t nextIdx = modChunkSize(fEndBufIdx + 1);
|
|
if (nextIdx == fStartBufIdx) {
|
|
fStartBufIdx = modChunkSize(fStartBufIdx + 6); // TODO: experiment. Probably revert to 1.
|
|
}
|
|
fBoundaries[nextIdx] = position;
|
|
fStatuses[nextIdx] = static_cast<uint16_t>(ruleStatusIdx);
|
|
fEndBufIdx = nextIdx;
|
|
if (update == UpdateCachePosition) {
|
|
// Set current position to the newly added boundary.
|
|
fBufIdx = nextIdx;
|
|
fTextIdx = position;
|
|
} else {
|
|
// Retaining the original cache position.
|
|
// Check if the added boundary wraps around the buffer, and would over-write the original position.
|
|
// It's the responsibility of callers of this function to not add too many.
|
|
U_ASSERT(nextIdx != fBufIdx);
|
|
}
|
|
}
|
|
|
|
bool RuleBasedBreakIterator::BreakCache::addPreceding(int32_t position, int32_t ruleStatusIdx, UpdatePositionValues update) {
|
|
U_ASSERT(position < fBoundaries[fStartBufIdx]);
|
|
U_ASSERT(ruleStatusIdx <= UINT16_MAX);
|
|
int32_t nextIdx = modChunkSize(fStartBufIdx - 1);
|
|
if (nextIdx == fEndBufIdx) {
|
|
if (fBufIdx == fEndBufIdx && update == RetainCachePosition) {
|
|
// Failure. The insertion of the new boundary would claim the buffer position that is the
|
|
// current iteration position. And we also want to retain the current iteration position.
|
|
// (The buffer is already completely full of entries that precede the iteration position.)
|
|
return false;
|
|
}
|
|
fEndBufIdx = modChunkSize(fEndBufIdx - 1);
|
|
}
|
|
fBoundaries[nextIdx] = position;
|
|
fStatuses[nextIdx] = static_cast<uint16_t>(ruleStatusIdx);
|
|
fStartBufIdx = nextIdx;
|
|
if (update == UpdateCachePosition) {
|
|
fBufIdx = nextIdx;
|
|
fTextIdx = position;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
void RuleBasedBreakIterator::BreakCache::dumpCache() {
|
|
#ifdef RBBI_DEBUG
|
|
RBBIDebugPrintf("fTextIdx:%d fBufIdx:%d\n", fTextIdx, fBufIdx);
|
|
for (int32_t i=fStartBufIdx; ; i=modChunkSize(i+1)) {
|
|
RBBIDebugPrintf("%d %d\n", i, fBoundaries[i]);
|
|
if (i == fEndBufIdx) {
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif // #if !UCONFIG_NO_BREAK_ITERATION
|