482 lines
17 KiB
C++
482 lines
17 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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#include "unicode/uniset.h"
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#include "uvector.h"
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// keep in sync with Transliterator
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static const UChar ID_SEP = 0x002D; /*-*/
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static const UChar ID_DELIM = 0x003B; /*;*/
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static const UChar NEWLINE = 10;
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// Empty string
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static const UChar EMPTY[] = {0}; //""
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U_NAMESPACE_BEGIN
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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 transliteratorCount The number of
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* <code>Transliterator</code> objects in transliterators.
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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 transliteratorCount,
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UnicodeFilter* adoptedFilter) :
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Transliterator(joinIDs(transliterators, transliteratorCount), adoptedFilter),
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trans(0), count(0), compoundRBTIndex(-1) {
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setTransliterators(transliterators, transliteratorCount);
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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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UTransDirection direction,
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UnicodeFilter* adoptedFilter,
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UParseError& parseError,
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UErrorCode& status) :
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Transliterator(id, adoptedFilter),
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trans(0), compoundRBTIndex(-1) {
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init(id, direction, -1, 0, TRUE,parseError,status);
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}
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CompoundTransliterator::CompoundTransliterator(const UnicodeString& id,
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UParseError& parseError,
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UErrorCode& status) :
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Transliterator(id, 0), // set filter to 0 here!
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trans(0), compoundRBTIndex(-1) {
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init(id, UTRANS_FORWARD, -1, 0, TRUE,parseError,status);
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}
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/**
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* Private constructor for compound RBTs. Construct a compound
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* transliterator using the given idBlock, with the adoptedTrans
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* inserted at the idSplitPoint.
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*/
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CompoundTransliterator::CompoundTransliterator(const UnicodeString& ID,
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const UnicodeString& idBlock,
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int32_t idSplitPoint,
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Transliterator *adoptedTrans,
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UParseError& parseError,
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UErrorCode& status) :
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Transliterator(ID, 0),
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trans(0), compoundRBTIndex(-1) {
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init(idBlock, UTRANS_FORWARD, idSplitPoint, adoptedTrans, FALSE,parseError,status);
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}
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/**
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* Private constructor for Transliterator from a vector of
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* transliterators. The vector order is FORWARD, so if dir is REVERSE
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* then the vector order will be reversed. The caller is responsible
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* for fixing up the ID.
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*/
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CompoundTransliterator::CompoundTransliterator(UTransDirection dir,
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UVector& list,
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UErrorCode& status) :
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Transliterator(UnicodeString("", ""), 0),
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trans(0), compoundRBTIndex(-1) {
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init(list, dir, FALSE, status);
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// assume caller will fixup ID
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}
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/**
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* Finish constructing a transliterator: only to be called by
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* constructors. Before calling init(), set trans and filter to NULL.
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* @param id the id containing ';'-separated entries
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* @param direction either FORWARD or REVERSE
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* @param idSplitPoint the index into id at which the
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* adoptedSplitTransliterator should be inserted, if there is one, or
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* -1 if there is none.
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* @param adoptedSplitTransliterator a transliterator to be inserted
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* before the entry at offset idSplitPoint in the id string. May be
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* NULL to insert no entry.
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* @param fixReverseID if TRUE, then reconstruct the ID of reverse
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* entries by calling getID() of component entries. Some constructors
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* do not require this because they apply a facade ID anyway.
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* @param status the error code indicating success or failure
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*/
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void CompoundTransliterator::init(const UnicodeString& id,
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UTransDirection direction,
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int32_t idSplitPoint,
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Transliterator *adoptedSplitTrans,
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UBool fixReverseID,
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UParseError& parseError,
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UErrorCode& status) {
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// assert(trans == 0);
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if (U_FAILURE(status)) {
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delete adoptedSplitTrans;
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return;
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}
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UVector list(status);
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UnicodeSet* compoundFilter = NULL;
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UnicodeString regenID;
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Transliterator::parseCompoundID(id, regenID, direction,
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idSplitPoint, adoptedSplitTrans,
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list, compoundRBTIndex, compoundFilter,
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parseError, status);
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init(list, direction, fixReverseID, status);
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if (compoundFilter != NULL) {
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adoptFilter(compoundFilter);
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}
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}
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/**
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* Finish constructing a transliterator: only to be called by
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* constructors. Before calling init(), set trans and filter to NULL.
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* @param list a vector of transliterator objects to be adopted. It
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* should NOT be empty. The list should be in declared order. That
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* is, it should be in the FORWARD order; if direction is REVERSE then
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* the list order will be reversed.
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* @param direction either FORWARD or REVERSE
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* @param fixReverseID if TRUE, then reconstruct the ID of reverse
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* entries by calling getID() of component entries. Some constructors
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* do not require this because they apply a facade ID anyway.
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* @param status the error code indicating success or failure
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*/
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void CompoundTransliterator::init(UVector& list,
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UTransDirection direction,
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UBool fixReverseID,
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UErrorCode& status) {
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// assert(trans == 0);
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// Allocate array
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if (U_SUCCESS(status)) {
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count = list.size();
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trans = new Transliterator*[count];
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}
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if (U_FAILURE(status) || trans == 0) {
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// assert(trans == 0);
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return;
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}
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// Move the transliterators from the vector into an array.
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// Reverse the order if necessary.
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int32_t i;
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for (i=0; i<count; ++i) {
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int32_t j = (direction == UTRANS_FORWARD) ? i : count - 1 - i;
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trans[i] = (Transliterator*) list.elementAt(j);
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}
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// Fix compoundRBTIndex for REVERSE transliterators
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if (compoundRBTIndex >= 0 && direction == UTRANS_REVERSE) {
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compoundRBTIndex = count - 1 - compoundRBTIndex;
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}
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// If the direction is UTRANS_REVERSE then we may need to fix the
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// ID.
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if (direction == UTRANS_REVERSE && fixReverseID) {
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UnicodeString newID;
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for (i=0; i<count; ++i) {
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if (i > 0) {
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newID.append(ID_DELIM);
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}
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newID.append(trans[i]->getID());
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}
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setID(newID);
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}
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computeMaximumContextLength();
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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 transCount) {
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UnicodeString id;
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for (int32_t i=0; i<transCount; ++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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* 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), compoundRBTIndex(-1) {
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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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if (trans != 0) {
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for (int32_t i=0; i<count; ++i) {
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delete trans[i];
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}
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delete[] trans;
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}
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trans = 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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}
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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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}
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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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}
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compoundRBTIndex = t.compoundRBTIndex;
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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[].
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freeTransliterators();
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trans = adoptedTransliterators;
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count = transCount;
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computeMaximumContextLength();
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setID(joinIDs(trans, count));
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}
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/**
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* Append c to buf, unless buf is empty or buf already ends in c.
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*/
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static void _smartAppend(UnicodeString& buf, UChar c) {
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if (buf.length() != 0 &&
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buf.charAt(buf.length() - 1) != c) {
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buf.append(c);
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}
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}
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UnicodeString& CompoundTransliterator::toRules(UnicodeString& rulesSource,
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UBool escapeUnprintable) const {
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// We do NOT call toRules() on our component transliterators, in
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// general. If we have several rule-based transliterators, this
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// yields a concatenation of the rules -- not what we want. We do
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// handle compound RBT transliterators specially -- those for which
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// compoundRBTIndex >= 0. For the transliterator at compoundRBTIndex,
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// we do call toRules() recursively.
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rulesSource.truncate(0);
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if (compoundRBTIndex >= 0 && getFilter() != NULL) {
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// If we are a compound RBT and if we have a global
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// filter, then emit it at the top.
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UnicodeString pat;
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rulesSource.append("::").append(getFilter()->toPattern(pat, escapeUnprintable)).append(ID_DELIM);
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}
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for (int32_t i=0; i<count; ++i) {
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UnicodeString rule;
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if (i == compoundRBTIndex) {
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trans[i]->toRules(rule, escapeUnprintable);
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} else {
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trans[i]->Transliterator::toRules(rule, escapeUnprintable);
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}
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_smartAppend(rulesSource, NEWLINE);
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rulesSource.append(rule);
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_smartAppend(rulesSource, ID_DELIM);
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}
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return rulesSource;
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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, UTransPosition& index,
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UBool incremental) const {
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/* Call each transliterator with the same contextStart and
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* start, but with the limit as modified
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* by preceding transliterators. The start 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 contextStart 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 contextStart and the initial start index.
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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 start (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) contextStart <= start <= limit <= contextLimit <= text.length()
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* (2) start <= start' <= limit' ;cursor doesn't move back
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* (3) start <= limit' ;text before cursor unchanged
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* - start' is the value of start 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. C, S, and L are the contextStart,
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* start, and limit. gl is the globalLimit. contextLimit is
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* equal to limit throughout.
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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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* C S L C S 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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* C SL C S
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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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* C S L C S
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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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* C S L
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*/
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if (count < 1) {
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index.start = index.limit;
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return; // Short circuit for empty compound transliterators
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}
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// compoundLimit is the limit value for the entire compound
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// operation. We overwrite index.limit with the previous
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// index.start. After each transliteration, we update
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// compoundLimit for insertions or deletions that have happened.
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int32_t compoundLimit = index.limit;
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// compoundStart is the start for the entire compound
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// operation.
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int32_t compoundStart = index.start;
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int32_t delta = 0; // delta in length
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// Give each transliterator a crack at the run of characters.
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// See comments at the top of the method for more detail.
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for (int32_t i=0; i<count; ++i) {
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index.start = compoundStart; // Reset start
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int32_t limit = index.limit;
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trans[i]->filteredTransliterate(text, index, incremental);
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// Cumulative delta for insertions/deletions
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delta += index.limit - limit;
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if (incremental) {
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// In the incremental case, only allow subsequent
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// transliterators to modify what has already been
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// completely processed by prior transliterators. In the
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// non-incrmental case, allow each transliterator to
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// process the entire text.
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index.limit = index.start;
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}
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}
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compoundLimit += delta;
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// Start is good where it is -- where the last transliterator left
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// it. Limit needs to be put back where it was, modulo
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// adjustments for deletions/insertions.
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index.limit = compoundLimit;
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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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U_NAMESPACE_END
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/* eof */
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