388 lines
13 KiB
C++
388 lines
13 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/17/99 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/cpdtrans.h"
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#include "unicode/unifilt.h"
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#include "unicode/unifltlg.h"
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/**
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* Constructs a new compound transliterator given an array of
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* transliterators. The array of transliterators may be of any
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* length, including zero or one, however, useful compound
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* transliterators have at least two components.
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* @param transliterators array of <code>Transliterator</code>
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* objects
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* @param filter the filter. Any character for which
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* <tt>filter.contains()</tt> returns <tt>false</tt> will not be
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* altered by this transliterator. If <tt>filter</tt> is
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* <tt>null</tt> then no filtering is applied.
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*/
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CompoundTransliterator::CompoundTransliterator(
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Transliterator* const transliterators[],
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int32_t count,
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UnicodeFilter* adoptedFilter) :
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Transliterator(joinIDs(transliterators, count), adoptedFilter),
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trans(0), count(0), filters(0) {
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setTransliterators(transliterators, count);
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}
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/**
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* Splits an ID of the form "ID;ID;..." into a compound using each
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* of the IDs.
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* @param ID of above form
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* @param forward if false, does the list in reverse order, and
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* takes the inverse of each ID.
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*/
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CompoundTransliterator::CompoundTransliterator(const UnicodeString& ID,
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Transliterator::Direction direction,
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UnicodeFilter* adoptedFilter,
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UErrorCode& status) :
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Transliterator(ID, 0), // set filter to 0 here!
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filters(0), trans(0) {
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init(ID, direction, adoptedFilter, status);
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}
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CompoundTransliterator::CompoundTransliterator(const UnicodeString& ID,
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UErrorCode& status) :
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Transliterator(ID, 0), // set filter to 0 here!
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filters(0), trans(0) {
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init(ID, FORWARD, 0, status);
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}
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void CompoundTransliterator::init(const UnicodeString& ID,
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Transliterator::Direction direction,
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UnicodeFilter* adoptedFilter,
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UErrorCode& status) {
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if (U_FAILURE(status)) return;
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UnicodeString* list = split(ID, ID_DELIM, count);
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trans = new Transliterator*[count];
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for (int32_t i = 0; i < count; ++i) {
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trans[i] = createInstance(list[direction==FORWARD ? i : (count-1-i)],
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direction);
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if (trans[i] == NULL) {
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while (++i < count) trans[i] = 0;
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status = U_ILLEGAL_ARGUMENT_ERROR;
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delete[] list;
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delete adoptedFilter;
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return;
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}
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}
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delete[] list;
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computeMaximumContextLength();
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adoptFilter(adoptedFilter);
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}
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/**
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* Return the IDs of the given list of transliterators, concatenated
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* with ID_DELIM delimiting them. Equivalent to the perlish expression
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* join(ID_DELIM, map($_.getID(), transliterators).
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*/
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UnicodeString CompoundTransliterator::joinIDs(Transliterator* const transliterators[],
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int32_t count) {
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UnicodeString id;
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for (int32_t i=0; i<count; ++i) {
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if (i > 0) {
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id.append(ID_DELIM);
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}
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id.append(transliterators[i]->getID());
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}
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return id; // Return temporary
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}
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/**
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* Splits a string, as in JavaScript
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*/
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UnicodeString* CompoundTransliterator::split(const UnicodeString& s,
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UChar divider,
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int32_t& count) {
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// changed MED
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// see how many there are
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count = 1;
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int32_t i;
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for (i = 0; i < s.length(); ++i) {
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if (s.charAt(i) == divider) ++count;
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}
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// make an array with them
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UnicodeString* result = new UnicodeString[count];
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int32_t last = 0;
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int32_t current = 0;
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for (i = 0; i < s.length(); ++i) {
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if (s.charAt(i) == divider) {
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s.extractBetween(last, i, result[current++]);
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last = i+1;
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}
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}
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s.extractBetween(last, i, result[current]);
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return result;
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}
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/**
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* Copy constructor.
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*/
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CompoundTransliterator::CompoundTransliterator(const CompoundTransliterator& t) :
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Transliterator(t), trans(0), count(0), filters(0) {
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*this = t;
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}
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/**
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* Destructor
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*/
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CompoundTransliterator::~CompoundTransliterator() {
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freeTransliterators();
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}
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void CompoundTransliterator::freeTransliterators(void) {
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for (int32_t i=0; i<count; ++i) {
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if (trans != 0) {
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delete trans[i];
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}
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if (filters != 0) {
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delete filters[i];
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}
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}
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delete[] trans;
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delete[] filters;
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trans = 0;
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filters = 0;
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count = 0;
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}
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/**
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* Assignment operator.
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*/
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CompoundTransliterator& CompoundTransliterator::operator=(
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const CompoundTransliterator& t) {
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Transliterator::operator=(t);
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int32_t i;
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for (i=0; i<count; ++i) {
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delete trans[i];
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trans[i] = 0;
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if (filters != 0) {
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delete filters[i];
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filters[i] = 0;
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}
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}
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if (t.count > count) {
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delete[] trans;
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trans = new Transliterator*[t.count];
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delete[] filters;
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filters = (t.filter == 0) ? 0 : new UnicodeFilter*[t.count];
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}
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count = t.count;
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for (i=0; i<count; ++i) {
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trans[i] = t.trans[i]->clone();
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if (t.filters != 0) {
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filters[i] = t.filters[i]->clone();
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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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* Transliterator API.
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*/
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Transliterator* CompoundTransliterator::clone(void) const {
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return new CompoundTransliterator(*this);
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}
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/**
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* Returns the number of transliterators in this chain.
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* @return number of transliterators in this chain.
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*/
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int32_t CompoundTransliterator::getCount(void) const {
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return count;
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}
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/**
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* Returns the transliterator at the given index in this chain.
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* @param index index into chain, from 0 to <code>getCount() - 1</code>
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* @return transliterator at the given index
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*/
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const Transliterator& CompoundTransliterator::getTransliterator(int32_t index) const {
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return *trans[index];
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}
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void CompoundTransliterator::setTransliterators(Transliterator* const transliterators[],
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int32_t transCount) {
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Transliterator** a = new Transliterator*[transCount];
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for (int32_t i=0; i<transCount; ++i) {
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a[i] = transliterators[i]->clone();
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}
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adoptTransliterators(a, transCount);
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}
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void CompoundTransliterator::adoptTransliterators(Transliterator* adoptedTransliterators[],
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int32_t transCount) {
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// First free trans[] and set count to zero. Once this is done,
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// orphan the filter. Set up the new trans[], and call
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// adoptFilter() to fix up the filters in trans[].
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freeTransliterators();
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UnicodeFilter *f = orphanFilter();
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trans = adoptedTransliterators;
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count = transCount;
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computeMaximumContextLength();
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adoptFilter(f);
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setID(joinIDs(trans, count));
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}
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/**
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* Override Transliterator. Modify the transliterators that make up
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* this compound transliterator so their filters are the logical AND
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* of this transliterator's filter and their own. Original filters
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* are kept in the filters array.
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*/
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void CompoundTransliterator::adoptFilter(UnicodeFilter* f) {
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/**
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* If there is a filter F for the compound transliterator as a
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* whole, then we need to modify every non-null filter f in
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* the chain to be f' = F & f.
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*
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* There are two possible states:
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* 1. getFilter() != 0
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* original filters in filters[]
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* createAnd() filters in trans[]
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* 2. getFilter() == 0
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* filters[] either unallocated or empty
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* original filters in trans[]
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* This method must insure that we stay in one of these states.
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*/
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if (count > 0) {
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if (f == 0) {
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// Restore original filters
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if (getFilter() != 0 && filters != 0) {
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for (int32_t i=0; i<count; ++i) {
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trans[i]->adoptFilter(filters[i]);
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filters[i] = 0;
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}
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}
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} else {
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// If the previous filter is 0, then the component filters
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// are in trans[i], and need to be pulled out into filters[].
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if (getFilter() == 0) {
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if (filters == 0) {
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filters = new UnicodeFilter*[count];
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}
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for (int32_t i=0; i<count; ++i) {
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filters[i] = trans[i]->orphanFilter();
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}
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}
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for (int32_t i=0; i<count; ++i) {
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trans[i]->adoptFilter(UnicodeFilterLogic::createAnd(f, filters[i]));
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}
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}
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}
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Transliterator::adoptFilter(f);
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}
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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void CompoundTransliterator::handleTransliterate(Replaceable& text, Position& index,
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UBool incremental) const {
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/* Call each transliterator with the same start value and
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* initial cursor index, but with the limit index as modified
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* by preceding transliterators. The cursor index must be
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* reset for each transliterator to give each a chance to
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* transliterate the text. The initial cursor index is known
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* to still point to the same place after each transliterator
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* is called because each transliterator will not change the
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* text between start and the initial value of cursor.
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*
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* IMPORTANT: After the first transliterator, each subsequent
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* transliterator only gets to transliterate text committed by
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* preceding transliterators; that is, the cursor (output
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* value) of transliterator i becomes the limit (input value)
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* of transliterator i+1. Finally, the overall limit is fixed
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* up before we return.
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*
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* Assumptions we make here:
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* (1) start <= cursor <= limit ;cursor valid on entry
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* (2) cursor <= cursor' <= limit' ;cursor doesn't move back
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* (3) cursor <= limit' ;text before cursor unchanged
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* - cursor' is the value of cursor after calling handleKT
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* - limit' is the value of limit after calling handleKT
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*/
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/**
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* Example: 3 transliterators. This example illustrates the
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* mechanics we need to implement. S, C, and L are the start,
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* cursor, and limit. gl is the globalLimit.
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*
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* 1. h-u, changes hex to Unicode
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*
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* 4 7 a d 0 4 7 a
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* abc/u0061/u => abca/u
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* S C L S C L gl=f->a
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*
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* 2. upup, changes "x" to "XX"
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*
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* 4 7 a 4 7 a
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* abca/u => abcAA/u
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* S CL S C
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* L gl=a->b
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* 3. u-h, changes Unicode to hex
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*
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* 4 7 a 4 7 a d 0 3
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* abcAA/u => abc/u0041/u0041/u
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* S C L S C
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* L gl=b->15
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* 4. return
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*
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* 4 7 a d 0 3
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* abc/u0041/u0041/u
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* S C L
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*/
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if (count < 1) {
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return; // Short circuit for empty compound transliterators
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}
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int32_t i;
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int32_t cursor = index.cursor;
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int32_t limit = index.limit;
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int32_t globalLimit = limit;
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/* globalLimit is the overall limit. We keep track of this
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* since we overwrite index.limit with the previous
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* index.cursor. After each transliteration, we update
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* globalLimit for insertions or deletions that have happened.
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*/
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for (i=0; i<count; ++i) {
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index.cursor = cursor; // Reset cursor
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index.limit = limit;
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trans[i]->handleTransliterate(text, index, incremental);
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// Adjust overall limit for insertions/deletions
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globalLimit += index.limit - limit;
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limit = index.cursor; // Move limit to end of committed text
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}
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// Cursor is good where it is -- where the last
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// transliterator left it. Limit needs to be put back
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// where it was, modulo adjustments for deletions/insertions.
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index.limit = globalLimit;
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}
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/**
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* Sets the length of the longest context required by this transliterator.
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* This is <em>preceding</em> context.
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*/
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void CompoundTransliterator::computeMaximumContextLength(void) {
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int32_t max = 0;
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for (int32_t i=0; i<count; ++i) {
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int32_t len = trans[i]->getMaximumContextLength();
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if (len > max) {
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max = len;
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}
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}
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setMaximumContextLength(max);
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}
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