521 lines
14 KiB
C++
521 lines
14 KiB
C++
/*******************************************************************************
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* Copyright (C) 1996-1999, 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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//
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// File mergecol.cpp
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//
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// Contains MergeCollation. This classes job is to take one or more
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// strings that represent the orderings in a collation, in the form
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// "a , A < b , B ....". MergeCollation parses the string into a list of
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// PatternEntry objects that are sorted by their position in the collation
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// ordering. The input string is allowed to have elements out of order, e.g.
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// "... b < c < d < e ..... c < ch". After being parsed by MergeCollation,
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// the pattern entries will be in the proper order: "b", "c", "ch", "d", "e"
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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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// 3/5/97 mark Cleaned up fixEntry(). Added constants BYTEPOWER
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// and BYTEMASK to replace BYTESIZE.
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// 6/17/97 helena In getPattern, added the queue-up list for entries
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// with the same extension chars.
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// 6/23/97 helena Adding comments to make code more readable.
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// 8/13/98 erm Synched up with 1.2 version of MergeCollation.java
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// 04/23/99 stephen Removed EDecompositionMode, merged with
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// Normalizer::EMode
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//=============================================================================
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#include "mergecol.h"
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#include "tables.h"
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#ifdef _DEBUG
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#include "unistrm.h"
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#endif
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const int32_t MergeCollation::BITARRAYSIZE = 8192;
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const uint8_t MergeCollation::BITARRAYMASK = 0x1;
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const int32_t MergeCollation::BYTEPOWER = 3;
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const int32_t MergeCollation::BYTEMASK = (1 << BYTEPOWER) - 1;
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/**
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* Creates from a pattern.
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* If the input pattern is incorrect, error code will be set.
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* @param pattern the merge collation pattern
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* @param success error code input/output parameter.
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*/
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MergeCollation::MergeCollation(const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& status)
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: lastEntry(NULL), saveEntry(NULL)
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{
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patterns = new VectorOfPointersToPatternEntry();
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if (patterns == NULL)
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{
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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statusArray = new uint8_t[BITARRAYSIZE];
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if (statusArray == NULL)
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{
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delete patterns;
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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int32_t i;
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for (i = 0; i < BITARRAYSIZE; i += 1)
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{
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statusArray[i] = 0;
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}
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setPattern(pattern, decompMode, status);
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if (U_FAILURE(status))
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{
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delete [] statusArray;
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statusArray = NULL;
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}
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}
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/**
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* Copy constructor
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* @param other the source merge collation object to be constructed with
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*/
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MergeCollation::MergeCollation(const MergeCollation& other)
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: lastEntry(NULL), saveEntry(NULL)
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{
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// This copy ctor does a deep copy - it duplicates the PatternEntry
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// objects as well as the vector object
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patterns = new VectorOfPointersToPatternEntry(*other.patterns);
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int32_t i;
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statusArray = new uint8_t[BITARRAYSIZE];
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for (i = 0; i < BITARRAYSIZE; i += 1)
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{
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statusArray[i] = other.statusArray[i];
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}
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}
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// Assignment operator. Does a deep copy.
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const MergeCollation&
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MergeCollation::operator=(const MergeCollation& other)
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{
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if (this != &other)
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{
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*patterns = *other.patterns;
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lastEntry = 0;
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saveEntry = 0;
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int32_t i;
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for (i = 0; i < BITARRAYSIZE; i += 1)
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{
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statusArray[i] = other.statusArray[i];
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}
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}
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return *this;
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}
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/**
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* Destructor
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*/
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MergeCollation::~MergeCollation()
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{
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delete patterns;
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delete [] statusArray;
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}
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/**
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* recovers current pattern as a string.
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* Basically, this runs through the PatternEntry array and outputs
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* @param result the string into which the pattern is recovered
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* the proper string for each element.
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* @param withWhiteSpace puts spacing around the entries, and \n
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* before & and <
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*/
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UnicodeString&
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MergeCollation::getPattern(UnicodeString& result, bool_t withWhiteSpace) const
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{
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int32_t i;
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PatternEntry *tmp = NULL;
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VectorOfPointer *extList = NULL;
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result.remove();
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for (i = 0; i < patterns->size(); i += 1)
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{
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PatternEntry* entry = patterns->at(i);
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if (entry != NULL)
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{
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// if the entry is an expanding ligature, queue up the entries until
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// the last same ligature has been processed.
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if (entry->extension.length() != 0)
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{
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if (extList == NULL)
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{
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extList = new VectorOfPointer();
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}
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extList->atInsert(extList->size(), (const void*&)entry);
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}
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else
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{
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// Process the queue-up list in reverse order to get the correct
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// pattern.
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if (extList != NULL)
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{
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const PatternEntry *last = findLastWithNoExtension(i - 1);
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for (int32_t j = extList->size() - 1; j >= 0 ; j -= 1)
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{
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tmp = (PatternEntry*)(extList->at(j));
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tmp->addToBuffer(result, FALSE, withWhiteSpace, last);
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}
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delete extList;
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extList = NULL;
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}
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entry->addToBuffer(result, FALSE, withWhiteSpace, NULL);
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}
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}
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}
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// Complete the queue-up list if it isn't empty
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if (extList != NULL)
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{
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const PatternEntry *last = findLastWithNoExtension(i - 1);
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for (int32_t j = extList->size() - 1; j >= 0 ; j -= 1)
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{
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tmp = (PatternEntry*)(extList->at(j));
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tmp->addToBuffer(result, FALSE, withWhiteSpace, last);
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}
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delete extList;
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}
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return result;
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}
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/**
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* emits the pattern for collation builder.
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* @param result the string into which the pattern is recovered
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* @param withWhiteSpace puts spacing around the entries, and \n
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* before & and <
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* @return emits the string in the format understable to the collation
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* builder.
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*/
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UnicodeString&
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MergeCollation::emitPattern(UnicodeString& result, bool_t withWhiteSpace) const
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{
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int32_t i;
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result.remove();
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for (i = 0; i < patterns->size(); i += 1)
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{
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PatternEntry *entry = (PatternEntry *)patterns->at(i);
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if (entry != NULL)
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{
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entry->addToBuffer(result, TRUE, withWhiteSpace, NULL);
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}
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}
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return result;
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}
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/**
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* sets the pattern.
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*/
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void MergeCollation::setPattern(const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& success)
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{
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if (U_FAILURE(success))
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{
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return;
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}
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patterns->clear();
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addPattern(pattern, decompMode, success);
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if (U_FAILURE(success))
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{
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delete patterns;
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patterns = NULL;
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}
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}
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/**
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* adds a pattern string to the current list of patterns
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* @param pattern the new pattern to be added
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*/
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void MergeCollation::addPattern(const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& success)
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{
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if (U_FAILURE(success) || (pattern.length() == 0))
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{
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return;
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}
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PatternEntry::Parser *parser = new PatternEntry::Parser(pattern, decompMode);
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PatternEntry *entry = parser->next(success);
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while (entry != NULL)
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{
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if (U_FAILURE(success))
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{
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delete entry;
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break;
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}
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fixEntry(entry, success);
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if (U_FAILURE(success))
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{
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delete entry;
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break;
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}
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entry = parser->next(success);
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}
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}
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/**
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* gets count of separate entries
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* @return the size of pattern entries
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*/
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int32_t
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MergeCollation::getCount() const {
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return patterns->size();
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}
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/**
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* gets count of separate entries
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* @param index the offset of the desired pattern entry
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* @return the requested pattern entry
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*/
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const PatternEntry* MergeCollation::getItemAt(UTextOffset index) const {
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return patterns->at(index);
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}
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// Find the last no-extension entry.
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const PatternEntry* MergeCollation::findLastWithNoExtension(int32_t i) const {
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for (--i;i >= 0; --i) {
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PatternEntry* entry = patterns->at(i);
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if ((entry != 0) && (entry->extension.length() == 0)) {
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return entry;
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}
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}
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return 0;
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}
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// Add a new PatternEntry to this MergeCollation's ordered list
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// of entries.
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//
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// If the strength is RESET, then just change the lastEntry to
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// be the current. (If the current is not in patterns, signal an error).
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//
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// If not, then remove the current entry, and add it after lastEntry
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// (which is usually at the end).
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//
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void MergeCollation::fixEntry(PatternEntry* newEntry,
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UErrorCode& success)
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{
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UnicodeString excess;
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bool_t changeLastEntry = TRUE;
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if (newEntry->strength != PatternEntry::RESET)
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{
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int32_t oldIndex = -1;
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// Use statusArray to mark if a unicode character has been
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// added in the table or not. The same later entry will
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// replace the previous one. This will improve the single
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// char entries dramatically which is the majority of the
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// entries.
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if (newEntry->chars.length() == 1)
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{
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UChar c = newEntry->chars[0];
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int32_t statusIndex = c >> BYTEPOWER;
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uint8_t bitClump = statusArray[statusIndex];
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uint8_t setBit = BITARRAYMASK << (c & BYTEMASK);
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if (bitClump != 0 && (bitClump & setBit) != 0)
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{
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int32_t i = 0;
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// Find the previous entry with the same key
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for (i = patterns->size() - 1; i >= 0; i -= 1)
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{
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PatternEntry *entry = patterns->at(i);
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if ((entry != 0) &&
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(entry->chars == newEntry->chars))
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{
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oldIndex = i;
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break;
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}
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}
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}
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else
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{
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// We're going to add an element that starts with this
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// character, so go ahead and set its bit.
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statusArray[statusIndex] = (uint8_t)(bitClump | setBit);
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}
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}
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else
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{
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oldIndex = patterns->lastIndexOf(newEntry);
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}
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if (oldIndex != -1)
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{
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PatternEntry *p = patterns->orphanAt(oldIndex);
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delete p;
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}
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// Find the insertion point for the new entry.
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int32_t lastIndex = findLastEntry(lastEntry, excess, success);
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if (U_FAILURE(success))
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{
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return;
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}
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// Do not change the last entry if the new entry is a expanding character
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if (excess.length() != 0)
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{
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// newEntry.extension = excess + newEntry.extensions;
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newEntry->extension.insert(0, excess);
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if (lastIndex != patterns->size())
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{
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lastEntry = saveEntry;
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changeLastEntry = FALSE;
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}
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}
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// Add the entry at the end or insert it in the middle
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if (lastIndex == patterns->size())
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{
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patterns->atPut(lastIndex, newEntry);
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saveEntry = newEntry;
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}
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else
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{
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patterns->atInsert(lastIndex, newEntry); // add at end
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}
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}
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if (changeLastEntry)
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{
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lastEntry = newEntry;
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}
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}
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int32_t
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MergeCollation::findLastEntry(const PatternEntry* lastEntry,
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UnicodeString& excess,
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UErrorCode& success) const
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{
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if (U_FAILURE(success))
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{
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return -1;
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}
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if (lastEntry == NULL)
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{
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return 0;
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}
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else if (lastEntry->strength != PatternEntry::RESET)
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{
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int32_t oldIndex = -1;
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// If the last entry is a single char entry and has been installed,
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// that means the last index is the real last index.
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if (lastEntry->chars.length() == 1)
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{
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int32_t index = lastEntry->chars[0] >> BYTEPOWER;
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if ((statusArray[index] &
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(uint8_t)(BITARRAYMASK << (lastEntry->chars[0] & BYTEMASK))) != 0)
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{
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oldIndex = patterns->lastIndexOf(lastEntry);
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}
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}
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else
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{
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oldIndex = patterns->lastIndexOf(lastEntry);
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}
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// must exist!
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if (oldIndex == -1)
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{
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success = U_INVALID_FORMAT_ERROR;
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return oldIndex;
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}
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return oldIndex + 1;
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}
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else
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{
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// We're doing a reset, i.e. inserting a new ordering at the position
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// just after the entry corresponding to lastEntry's first character
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int32_t i;
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// Search backwards for string that contains this one;
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// most likely entry is last one
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for (i = patterns->size() - 1; i >= 0; i -= 1)
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{
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PatternEntry* entry = patterns->at(i);
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UnicodeString buffer;
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if (entry != 0)
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{
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//
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// Look for elements with the same beginning key. The extra
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// characters will be the expanding portion. This handles cases like
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// "& Question-mark < '?'". We find the existing PatternEntry that matches
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// the longest possible substring of "Question-mark", which will probably
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// be 'Q'. We save the characters that didn't match ("uestion-mark" in
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// this case), and then return the next index.
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//
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if (entry->chars.compareBetween(0, entry->chars.length(),
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lastEntry->chars,0,entry->chars.length()) == 0)
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{
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lastEntry->chars.extractBetween(entry->chars.length(),
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lastEntry->chars.length(),
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buffer);
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excess += buffer;
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break;
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}
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}
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}
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if (i == -1)
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{
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success = U_INVALID_FORMAT_ERROR;
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return i;
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}
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return i + 1;
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}
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}
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