620 lines
20 KiB
C++
620 lines
20 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2010-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: stringtriebuilder.cpp
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2010dec24
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* created by: Markus W. Scherer
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*/
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#include <typeinfo> // for 'typeid' to work
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#include "unicode/utypes.h"
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#include "unicode/stringtriebuilder.h"
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#include "uassert.h"
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#include "uhash.h"
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U_CDECL_BEGIN
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static int32_t U_CALLCONV
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hashStringTrieNode(const UHashTok key) {
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return icu::StringTrieBuilder::hashNode(key.pointer);
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}
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static UBool U_CALLCONV
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equalStringTrieNodes(const UHashTok key1, const UHashTok key2) {
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return icu::StringTrieBuilder::equalNodes(key1.pointer, key2.pointer);
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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StringTrieBuilder::StringTrieBuilder() : nodes(NULL) {}
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StringTrieBuilder::~StringTrieBuilder() {
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deleteCompactBuilder();
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}
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void
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StringTrieBuilder::createCompactBuilder(int32_t sizeGuess, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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return;
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}
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nodes=uhash_openSize(hashStringTrieNode, equalStringTrieNodes, NULL,
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sizeGuess, &errorCode);
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if(U_SUCCESS(errorCode) && nodes==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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if(U_SUCCESS(errorCode)) {
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uhash_setKeyDeleter(nodes, uprv_deleteUObject);
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}
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}
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void
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StringTrieBuilder::deleteCompactBuilder() {
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uhash_close(nodes);
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nodes=NULL;
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}
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void
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StringTrieBuilder::build(UStringTrieBuildOption buildOption, int32_t elementsLength,
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UErrorCode &errorCode) {
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if(buildOption==USTRINGTRIE_BUILD_FAST) {
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writeNode(0, elementsLength, 0);
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} else /* USTRINGTRIE_BUILD_SMALL */ {
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createCompactBuilder(2*elementsLength, errorCode);
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Node *root=makeNode(0, elementsLength, 0, errorCode);
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if(U_SUCCESS(errorCode)) {
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root->markRightEdgesFirst(-1);
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root->write(*this);
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}
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deleteCompactBuilder();
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}
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}
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// Requires start<limit,
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// and all strings of the [start..limit[ elements must be sorted and
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// have a common prefix of length unitIndex.
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int32_t
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StringTrieBuilder::writeNode(int32_t start, int32_t limit, int32_t unitIndex) {
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UBool hasValue=FALSE;
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int32_t value=0;
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int32_t type;
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if(unitIndex==getElementStringLength(start)) {
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// An intermediate or final value.
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value=getElementValue(start++);
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if(start==limit) {
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return writeValueAndFinal(value, TRUE); // final-value node
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}
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hasValue=TRUE;
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}
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// Now all [start..limit[ strings are longer than unitIndex.
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int32_t minUnit=getElementUnit(start, unitIndex);
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int32_t maxUnit=getElementUnit(limit-1, unitIndex);
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if(minUnit==maxUnit) {
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// Linear-match node: All strings have the same character at unitIndex.
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int32_t lastUnitIndex=getLimitOfLinearMatch(start, limit-1, unitIndex);
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writeNode(start, limit, lastUnitIndex);
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// Break the linear-match sequence into chunks of at most kMaxLinearMatchLength.
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int32_t length=lastUnitIndex-unitIndex;
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int32_t maxLinearMatchLength=getMaxLinearMatchLength();
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while(length>maxLinearMatchLength) {
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lastUnitIndex-=maxLinearMatchLength;
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length-=maxLinearMatchLength;
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writeElementUnits(start, lastUnitIndex, maxLinearMatchLength);
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write(getMinLinearMatch()+maxLinearMatchLength-1);
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}
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writeElementUnits(start, unitIndex, length);
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type=getMinLinearMatch()+length-1;
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} else {
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// Branch node.
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int32_t length=countElementUnits(start, limit, unitIndex);
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// length>=2 because minUnit!=maxUnit.
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writeBranchSubNode(start, limit, unitIndex, length);
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if(--length<getMinLinearMatch()) {
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type=length;
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} else {
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write(length);
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type=0;
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}
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}
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return writeValueAndType(hasValue, value, type);
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}
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// start<limit && all strings longer than unitIndex &&
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// length different units at unitIndex
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int32_t
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StringTrieBuilder::writeBranchSubNode(int32_t start, int32_t limit, int32_t unitIndex, int32_t length) {
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UChar middleUnits[kMaxSplitBranchLevels];
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int32_t lessThan[kMaxSplitBranchLevels];
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int32_t ltLength=0;
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while(length>getMaxBranchLinearSubNodeLength()) {
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// Branch on the middle unit.
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// First, find the middle unit.
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int32_t i=skipElementsBySomeUnits(start, unitIndex, length/2);
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// Encode the less-than branch first.
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middleUnits[ltLength]=getElementUnit(i, unitIndex); // middle unit
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lessThan[ltLength]=writeBranchSubNode(start, i, unitIndex, length/2);
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++ltLength;
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// Continue for the greater-or-equal branch.
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start=i;
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length=length-length/2;
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}
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// For each unit, find its elements array start and whether it has a final value.
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int32_t starts[kMaxBranchLinearSubNodeLength];
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UBool isFinal[kMaxBranchLinearSubNodeLength-1];
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int32_t unitNumber=0;
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do {
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int32_t i=starts[unitNumber]=start;
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UChar unit=getElementUnit(i++, unitIndex);
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i=indexOfElementWithNextUnit(i, unitIndex, unit);
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isFinal[unitNumber]= start==i-1 && unitIndex+1==getElementStringLength(start);
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start=i;
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} while(++unitNumber<length-1);
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// unitNumber==length-1, and the maxUnit elements range is [start..limit[
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starts[unitNumber]=start;
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// Write the sub-nodes in reverse order: The jump lengths are deltas from
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// after their own positions, so if we wrote the minUnit sub-node first,
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// then its jump delta would be larger.
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// Instead we write the minUnit sub-node last, for a shorter delta.
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int32_t jumpTargets[kMaxBranchLinearSubNodeLength-1];
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do {
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--unitNumber;
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if(!isFinal[unitNumber]) {
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jumpTargets[unitNumber]=writeNode(starts[unitNumber], starts[unitNumber+1], unitIndex+1);
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}
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} while(unitNumber>0);
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// The maxUnit sub-node is written as the very last one because we do
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// not jump for it at all.
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unitNumber=length-1;
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writeNode(start, limit, unitIndex+1);
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int32_t offset=write(getElementUnit(start, unitIndex));
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// Write the rest of this node's unit-value pairs.
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while(--unitNumber>=0) {
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start=starts[unitNumber];
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int32_t value;
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if(isFinal[unitNumber]) {
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// Write the final value for the one string ending with this unit.
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value=getElementValue(start);
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} else {
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// Write the delta to the start position of the sub-node.
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value=offset-jumpTargets[unitNumber];
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}
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writeValueAndFinal(value, isFinal[unitNumber]);
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offset=write(getElementUnit(start, unitIndex));
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}
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// Write the split-branch nodes.
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while(ltLength>0) {
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--ltLength;
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writeDeltaTo(lessThan[ltLength]);
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offset=write(middleUnits[ltLength]);
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}
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return offset;
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}
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// Requires start<limit,
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// and all strings of the [start..limit[ elements must be sorted and
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// have a common prefix of length unitIndex.
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StringTrieBuilder::Node *
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StringTrieBuilder::makeNode(int32_t start, int32_t limit, int32_t unitIndex, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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return NULL;
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}
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UBool hasValue=FALSE;
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int32_t value=0;
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if(unitIndex==getElementStringLength(start)) {
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// An intermediate or final value.
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value=getElementValue(start++);
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if(start==limit) {
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return registerFinalValue(value, errorCode);
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}
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hasValue=TRUE;
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}
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Node *node;
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// Now all [start..limit[ strings are longer than unitIndex.
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int32_t minUnit=getElementUnit(start, unitIndex);
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int32_t maxUnit=getElementUnit(limit-1, unitIndex);
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if(minUnit==maxUnit) {
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// Linear-match node: All strings have the same character at unitIndex.
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int32_t lastUnitIndex=getLimitOfLinearMatch(start, limit-1, unitIndex);
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Node *nextNode=makeNode(start, limit, lastUnitIndex, errorCode);
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// Break the linear-match sequence into chunks of at most kMaxLinearMatchLength.
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int32_t length=lastUnitIndex-unitIndex;
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int32_t maxLinearMatchLength=getMaxLinearMatchLength();
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while(length>maxLinearMatchLength) {
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lastUnitIndex-=maxLinearMatchLength;
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length-=maxLinearMatchLength;
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node=createLinearMatchNode(start, lastUnitIndex, maxLinearMatchLength, nextNode);
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nextNode=registerNode(node, errorCode);
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}
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node=createLinearMatchNode(start, unitIndex, length, nextNode);
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} else {
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// Branch node.
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int32_t length=countElementUnits(start, limit, unitIndex);
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// length>=2 because minUnit!=maxUnit.
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Node *subNode=makeBranchSubNode(start, limit, unitIndex, length, errorCode);
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node=new BranchHeadNode(length, subNode);
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}
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if(hasValue && node!=NULL) {
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if(matchNodesCanHaveValues()) {
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((ValueNode *)node)->setValue(value);
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} else {
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node=new IntermediateValueNode(value, registerNode(node, errorCode));
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}
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}
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return registerNode(node, errorCode);
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}
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// start<limit && all strings longer than unitIndex &&
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// length different units at unitIndex
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StringTrieBuilder::Node *
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StringTrieBuilder::makeBranchSubNode(int32_t start, int32_t limit, int32_t unitIndex,
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int32_t length, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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return NULL;
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}
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UChar middleUnits[kMaxSplitBranchLevels];
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Node *lessThan[kMaxSplitBranchLevels];
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int32_t ltLength=0;
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while(length>getMaxBranchLinearSubNodeLength()) {
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// Branch on the middle unit.
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// First, find the middle unit.
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int32_t i=skipElementsBySomeUnits(start, unitIndex, length/2);
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// Create the less-than branch.
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middleUnits[ltLength]=getElementUnit(i, unitIndex); // middle unit
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lessThan[ltLength]=makeBranchSubNode(start, i, unitIndex, length/2, errorCode);
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++ltLength;
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// Continue for the greater-or-equal branch.
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start=i;
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length=length-length/2;
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}
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if(U_FAILURE(errorCode)) {
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return NULL;
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}
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ListBranchNode *listNode=new ListBranchNode();
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if(listNode==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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// For each unit, find its elements array start and whether it has a final value.
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int32_t unitNumber=0;
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do {
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int32_t i=start;
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UChar unit=getElementUnit(i++, unitIndex);
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i=indexOfElementWithNextUnit(i, unitIndex, unit);
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if(start==i-1 && unitIndex+1==getElementStringLength(start)) {
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listNode->add(unit, getElementValue(start));
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} else {
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listNode->add(unit, makeNode(start, i, unitIndex+1, errorCode));
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}
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start=i;
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} while(++unitNumber<length-1);
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// unitNumber==length-1, and the maxUnit elements range is [start..limit[
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UChar unit=getElementUnit(start, unitIndex);
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if(start==limit-1 && unitIndex+1==getElementStringLength(start)) {
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listNode->add(unit, getElementValue(start));
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} else {
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listNode->add(unit, makeNode(start, limit, unitIndex+1, errorCode));
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}
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Node *node=registerNode(listNode, errorCode);
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// Create the split-branch nodes.
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while(ltLength>0) {
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--ltLength;
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node=registerNode(
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new SplitBranchNode(middleUnits[ltLength], lessThan[ltLength], node), errorCode);
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}
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return node;
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}
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StringTrieBuilder::Node *
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StringTrieBuilder::registerNode(Node *newNode, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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delete newNode;
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return NULL;
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}
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if(newNode==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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const UHashElement *old=uhash_find(nodes, newNode);
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if(old!=NULL) {
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delete newNode;
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return (Node *)old->key.pointer;
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}
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// If uhash_puti() returns a non-zero value from an equivalent, previously
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// registered node, then uhash_find() failed to find that and we will leak newNode.
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#if !U_RELEASE
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int32_t oldValue= // Only in debug mode to avoid a compiler warning about unused oldValue.
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#endif
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uhash_puti(nodes, newNode, 1, &errorCode);
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U_ASSERT(oldValue==0);
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if(U_FAILURE(errorCode)) {
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delete newNode;
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return NULL;
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}
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return newNode;
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}
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StringTrieBuilder::Node *
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StringTrieBuilder::registerFinalValue(int32_t value, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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return NULL;
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}
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FinalValueNode key(value);
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const UHashElement *old=uhash_find(nodes, &key);
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if(old!=NULL) {
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return (Node *)old->key.pointer;
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}
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Node *newNode=new FinalValueNode(value);
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if(newNode==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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// If uhash_puti() returns a non-zero value from an equivalent, previously
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// registered node, then uhash_find() failed to find that and we will leak newNode.
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#if !U_RELEASE
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int32_t oldValue= // Only in debug mode to avoid a compiler warning about unused oldValue.
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#endif
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uhash_puti(nodes, newNode, 1, &errorCode);
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U_ASSERT(oldValue==0);
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if(U_FAILURE(errorCode)) {
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delete newNode;
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return NULL;
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}
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return newNode;
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}
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UBool
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StringTrieBuilder::hashNode(const void *node) {
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return ((const Node *)node)->hashCode();
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}
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UBool
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StringTrieBuilder::equalNodes(const void *left, const void *right) {
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return *(const Node *)left==*(const Node *)right;
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}
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UOBJECT_DEFINE_NO_RTTI_IMPLEMENTATION(StringTrieBuilder)
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UBool
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StringTrieBuilder::Node::operator==(const Node &other) const {
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return this==&other || (typeid(*this)==typeid(other) && hash==other.hash);
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}
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int32_t
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StringTrieBuilder::Node::markRightEdgesFirst(int32_t edgeNumber) {
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if(offset==0) {
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offset=edgeNumber;
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}
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return edgeNumber;
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}
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UOBJECT_DEFINE_NO_RTTI_IMPLEMENTATION(StringTrieBuilder::Node)
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UBool
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StringTrieBuilder::FinalValueNode::operator==(const Node &other) const {
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if(this==&other) {
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return TRUE;
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}
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if(!Node::operator==(other)) {
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return FALSE;
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}
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const FinalValueNode &o=(const FinalValueNode &)other;
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return value==o.value;
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}
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void
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StringTrieBuilder::FinalValueNode::write(StringTrieBuilder &builder) {
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offset=builder.writeValueAndFinal(value, TRUE);
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}
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UBool
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StringTrieBuilder::ValueNode::operator==(const Node &other) const {
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if(this==&other) {
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return TRUE;
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}
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if(!Node::operator==(other)) {
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return FALSE;
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}
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const ValueNode &o=(const ValueNode &)other;
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return hasValue==o.hasValue && (!hasValue || value==o.value);
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}
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UBool
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StringTrieBuilder::IntermediateValueNode::operator==(const Node &other) const {
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if(this==&other) {
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return TRUE;
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}
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if(!ValueNode::operator==(other)) {
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return FALSE;
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}
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const IntermediateValueNode &o=(const IntermediateValueNode &)other;
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return next==o.next;
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}
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int32_t
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StringTrieBuilder::IntermediateValueNode::markRightEdgesFirst(int32_t edgeNumber) {
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if(offset==0) {
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offset=edgeNumber=next->markRightEdgesFirst(edgeNumber);
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}
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return edgeNumber;
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}
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void
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StringTrieBuilder::IntermediateValueNode::write(StringTrieBuilder &builder) {
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next->write(builder);
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offset=builder.writeValueAndFinal(value, FALSE);
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}
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UBool
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StringTrieBuilder::LinearMatchNode::operator==(const Node &other) const {
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if(this==&other) {
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return TRUE;
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}
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if(!ValueNode::operator==(other)) {
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return FALSE;
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}
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const LinearMatchNode &o=(const LinearMatchNode &)other;
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return length==o.length && next==o.next;
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}
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int32_t
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StringTrieBuilder::LinearMatchNode::markRightEdgesFirst(int32_t edgeNumber) {
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if(offset==0) {
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offset=edgeNumber=next->markRightEdgesFirst(edgeNumber);
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}
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return edgeNumber;
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}
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UBool
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StringTrieBuilder::ListBranchNode::operator==(const Node &other) const {
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if(this==&other) {
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return TRUE;
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}
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if(!Node::operator==(other)) {
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return FALSE;
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}
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const ListBranchNode &o=(const ListBranchNode &)other;
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for(int32_t i=0; i<length; ++i) {
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if(units[i]!=o.units[i] || values[i]!=o.values[i] || equal[i]!=o.equal[i]) {
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return FALSE;
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}
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}
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return TRUE;
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}
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int32_t
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StringTrieBuilder::ListBranchNode::markRightEdgesFirst(int32_t edgeNumber) {
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if(offset==0) {
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firstEdgeNumber=edgeNumber;
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int32_t step=0;
|
|
int32_t i=length;
|
|
do {
|
|
Node *edge=equal[--i];
|
|
if(edge!=NULL) {
|
|
edgeNumber=edge->markRightEdgesFirst(edgeNumber-step);
|
|
}
|
|
// For all but the rightmost edge, decrement the edge number.
|
|
step=1;
|
|
} while(i>0);
|
|
offset=edgeNumber;
|
|
}
|
|
return edgeNumber;
|
|
}
|
|
|
|
void
|
|
StringTrieBuilder::ListBranchNode::write(StringTrieBuilder &builder) {
|
|
// Write the sub-nodes in reverse order: The jump lengths are deltas from
|
|
// after their own positions, so if we wrote the minUnit sub-node first,
|
|
// then its jump delta would be larger.
|
|
// Instead we write the minUnit sub-node last, for a shorter delta.
|
|
int32_t unitNumber=length-1;
|
|
Node *rightEdge=equal[unitNumber];
|
|
int32_t rightEdgeNumber= rightEdge==NULL ? firstEdgeNumber : rightEdge->getOffset();
|
|
do {
|
|
--unitNumber;
|
|
if(equal[unitNumber]!=NULL) {
|
|
equal[unitNumber]->writeUnlessInsideRightEdge(firstEdgeNumber, rightEdgeNumber, builder);
|
|
}
|
|
} while(unitNumber>0);
|
|
// The maxUnit sub-node is written as the very last one because we do
|
|
// not jump for it at all.
|
|
unitNumber=length-1;
|
|
if(rightEdge==NULL) {
|
|
builder.writeValueAndFinal(values[unitNumber], TRUE);
|
|
} else {
|
|
rightEdge->write(builder);
|
|
}
|
|
offset=builder.write(units[unitNumber]);
|
|
// Write the rest of this node's unit-value pairs.
|
|
while(--unitNumber>=0) {
|
|
int32_t value;
|
|
UBool isFinal;
|
|
if(equal[unitNumber]==NULL) {
|
|
// Write the final value for the one string ending with this unit.
|
|
value=values[unitNumber];
|
|
isFinal=TRUE;
|
|
} else {
|
|
// Write the delta to the start position of the sub-node.
|
|
U_ASSERT(equal[unitNumber]->getOffset()>0);
|
|
value=offset-equal[unitNumber]->getOffset();
|
|
isFinal=FALSE;
|
|
}
|
|
builder.writeValueAndFinal(value, isFinal);
|
|
offset=builder.write(units[unitNumber]);
|
|
}
|
|
}
|
|
|
|
UBool
|
|
StringTrieBuilder::SplitBranchNode::operator==(const Node &other) const {
|
|
if(this==&other) {
|
|
return TRUE;
|
|
}
|
|
if(!Node::operator==(other)) {
|
|
return FALSE;
|
|
}
|
|
const SplitBranchNode &o=(const SplitBranchNode &)other;
|
|
return unit==o.unit && lessThan==o.lessThan && greaterOrEqual==o.greaterOrEqual;
|
|
}
|
|
|
|
int32_t
|
|
StringTrieBuilder::SplitBranchNode::markRightEdgesFirst(int32_t edgeNumber) {
|
|
if(offset==0) {
|
|
firstEdgeNumber=edgeNumber;
|
|
edgeNumber=greaterOrEqual->markRightEdgesFirst(edgeNumber);
|
|
offset=edgeNumber=lessThan->markRightEdgesFirst(edgeNumber-1);
|
|
}
|
|
return edgeNumber;
|
|
}
|
|
|
|
void
|
|
StringTrieBuilder::SplitBranchNode::write(StringTrieBuilder &builder) {
|
|
// Encode the less-than branch first.
|
|
lessThan->writeUnlessInsideRightEdge(firstEdgeNumber, greaterOrEqual->getOffset(), builder);
|
|
// Encode the greater-or-equal branch last because we do not jump for it at all.
|
|
greaterOrEqual->write(builder);
|
|
// Write this node.
|
|
U_ASSERT(lessThan->getOffset()>0);
|
|
builder.writeDeltaTo(lessThan->getOffset()); // less-than
|
|
offset=builder.write(unit);
|
|
}
|
|
|
|
UBool
|
|
StringTrieBuilder::BranchHeadNode::operator==(const Node &other) const {
|
|
if(this==&other) {
|
|
return TRUE;
|
|
}
|
|
if(!ValueNode::operator==(other)) {
|
|
return FALSE;
|
|
}
|
|
const BranchHeadNode &o=(const BranchHeadNode &)other;
|
|
return length==o.length && next==o.next;
|
|
}
|
|
|
|
int32_t
|
|
StringTrieBuilder::BranchHeadNode::markRightEdgesFirst(int32_t edgeNumber) {
|
|
if(offset==0) {
|
|
offset=edgeNumber=next->markRightEdgesFirst(edgeNumber);
|
|
}
|
|
return edgeNumber;
|
|
}
|
|
|
|
void
|
|
StringTrieBuilder::BranchHeadNode::write(StringTrieBuilder &builder) {
|
|
next->write(builder);
|
|
if(length<=builder.getMinLinearMatch()) {
|
|
offset=builder.writeValueAndType(hasValue, value, length-1);
|
|
} else {
|
|
builder.write(length-1);
|
|
offset=builder.writeValueAndType(hasValue, value, 0);
|
|
}
|
|
}
|
|
|
|
U_NAMESPACE_END
|