Transliterator* TransliteratorAlias::create(UParseError& pe,
UErrorCode& ec) {
if (U_FAILURE(ec)) {
return 0;
}
Transliterator *t = NULL;
switch (type) {
case SIMPLE:
t = Transliterator::createInstance(aliasesOrRules, UTRANS_FORWARD, pe, ec);
if(U_FAILURE(ec)){
return 0;
}
if (compoundFilter != 0)
t->adoptFilter((UnicodeSet*)compoundFilter->clone());
break;
case COMPOUND:
{
// the total number of transliterators in the compound is the total number of anonymous transliterators
// plus the total number of ID blocks-- we start by assuming the list begins and ends with an ID
// block and that each pair anonymous transliterators has an ID block between them. Then we go back
// to see whether there really are ID blocks at the beginning and end (by looking for U+FFFF, which
// marks the position where an anonymous transliterator goes) and adjust accordingly
int32_t anonymousRBTs = transes->size();
int32_t transCount = anonymousRBTs * 2 + 1;
if (!aliasesOrRules.isEmpty() && aliasesOrRules[0] == (UChar)(0xffff))
--transCount;
if (aliasesOrRules.length() >= 2 && aliasesOrRules[aliasesOrRules.length() - 1] == (UChar)(0xffff))
--transCount;
UnicodeString noIDBlock((UChar)(0xffff));
noIDBlock += ((UChar)(0xffff));
int32_t pos = aliasesOrRules.indexOf(noIDBlock);
while (pos >= 0) {
--transCount;
pos = aliasesOrRules.indexOf(noIDBlock, pos + 1);
}
UVector transliterators(ec);
UnicodeString idBlock;
int32_t blockSeparatorPos = aliasesOrRules.indexOf((UChar)(0xffff));
while (blockSeparatorPos >= 0) {
aliasesOrRules.extract(0, blockSeparatorPos, idBlock);
aliasesOrRules.remove(0, blockSeparatorPos + 1);
if (!idBlock.isEmpty())
transliterators.addElement(Transliterator::createInstance(idBlock, UTRANS_FORWARD, pe, ec), ec);
if (!transes->isEmpty())
transliterators.addElement(transes->orphanElementAt(0), ec);
blockSeparatorPos = aliasesOrRules.indexOf((UChar)(0xffff));
}
if (!aliasesOrRules.isEmpty())
transliterators.addElement(Transliterator::createInstance(aliasesOrRules, UTRANS_FORWARD, pe, ec), ec);
while (!transes->isEmpty())
transliterators.addElement(transes->orphanElementAt(0), ec);
if (U_SUCCESS(ec)) {
t = new CompoundTransliterator(ID, transliterators,
(compoundFilter ? (UnicodeSet*)(compoundFilter->clone()) : 0),
anonymousRBTs, pe, ec);
if (t == 0) {
ec = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
} else {
for (int32_t i = 0; i < transliterators.size(); i++)
delete (Transliterator*)(transliterators.elementAt(i));
}
}
break;
case RULES:
U_ASSERT(FALSE); // don't call create() if isRuleBased() returns TRUE!
break;
}
return t;
}
Transliterator* U_EXPORT2
Transliterator::createFromRules(const UnicodeString& ID,
const UnicodeString& rules,
UTransDirection dir,
UParseError& parseError,
UErrorCode& status)
{
Transliterator* t = NULL;
TransliteratorParser parser(status);
parser.parse(rules, dir, parseError, status);
if (U_FAILURE(status)) {
return 0;
}
// NOTE: The logic here matches that in TransliteratorRegistry.
if (parser.idBlockVector.size() == 0 && parser.dataVector.size() == 0) {
t = new NullTransliterator();
}
else if (parser.idBlockVector.size() == 0 && parser.dataVector.size() == 1) {
t = new RuleBasedTransliterator(ID, (TransliterationRuleData*)parser.dataVector.orphanElementAt(0), TRUE);
}
else if (parser.idBlockVector.size() == 1 && parser.dataVector.size() == 0) {
// idBlock, no data -- this is an alias. The ID has
// been munged from reverse into forward mode, if
// necessary, so instantiate the ID in the forward
// direction.
if (parser.compoundFilter != NULL) {
UnicodeString filterPattern;
parser.compoundFilter->toPattern(filterPattern, FALSE);
t = createInstance(filterPattern + UnicodeString(ID_DELIM)
+ *((UnicodeString*)parser.idBlockVector.elementAt(0)), UTRANS_FORWARD, parseError, status);
}
else
t = createInstance(*((UnicodeString*)parser.idBlockVector.elementAt(0)), UTRANS_FORWARD, parseError, status);
if (t != NULL) {
t->setID(ID);
}
}
else {
UVector transliterators(status);
int32_t passNumber = 1;
int32_t limit = parser.idBlockVector.size();
if (parser.dataVector.size() > limit)
limit = parser.dataVector.size();
for (int32_t i = 0; i < limit; i++) {
if (i < parser.idBlockVector.size()) {
UnicodeString* idBlock = (UnicodeString*)parser.idBlockVector.elementAt(i);
if (!idBlock->isEmpty()) {
Transliterator* temp = createInstance(*idBlock, UTRANS_FORWARD, parseError, status);
if (temp != NULL && temp->getDynamicClassID() != NullTransliterator::getStaticClassID())
transliterators.addElement(temp, status);
else
delete temp;
}
}
if (!parser.dataVector.isEmpty()) {
TransliterationRuleData* data = (TransliterationRuleData*)parser.dataVector.orphanElementAt(0);
RuleBasedTransliterator* temprbt = new RuleBasedTransliterator(UnicodeString(CompoundTransliterator::PASS_STRING) + (passNumber++),
data, TRUE);
// Check if NULL before adding it to transliterators to avoid future usage of NULL pointer.
if (temprbt == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return t;
}
transliterators.addElement(temprbt, status);
}
}
t = new CompoundTransliterator(transliterators, passNumber - 1, parseError, status);
// Null pointer check
if (t != NULL) {
t->setID(ID);
t->adoptFilter(parser.orphanCompoundFilter());
}
}
if (U_SUCCESS(status) && t == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return t;
}
