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namespace antlr3 {
template<class ImplTraits>
RewriteRuleTokenStream<ImplTraits>::RewriteRuleTokenStream(TreeAdaptorType* adaptor, const char* /*description*/)
: m_adaptor(adaptor)
, m_elements()
, m_dirty(false)
{
m_cursor = m_elements.begin();
}
template<class ImplTraits>
RewriteRuleTokenStream<ImplTraits>::RewriteRuleTokenStream(TreeAdaptorType* adaptor, const char* /*description*/,
const TokenType* oneElement
)
: m_adaptor(adaptor)
, m_elements()
, m_dirty(false)
{
if( oneElement != NULL )
this->add( oneElement );
m_cursor = m_elements.begin();
}
template<class ImplTraits>
RewriteRuleTokenStream<ImplTraits>::RewriteRuleTokenStream(TreeAdaptorType* adaptor, const char* /*description*/,
const ElementsType& elements
)
: m_adaptor(adaptor)
, m_elements(elements)
, m_dirty(false)
{
m_cursor = m_elements.begin();
}
template<class ImplTraits>
void RewriteRuleTokenStream<ImplTraits>::reset()
{
m_cursor = m_elements.begin();
m_dirty = true;
}
template<class ImplTraits>
void RewriteRuleTokenStream<ImplTraits>::add(const ElementType* el)
{
if ( el == NULL)
return;
m_elements.push_back(el);
m_cursor = m_elements.begin();
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::ElementsType::iterator
RewriteRuleTokenStream<ImplTraits>::_next()
{
if (m_elements.empty())
{
// This means that the stream is empty
// Caller must cope with this (TODO throw RewriteEmptyStreamException)
return m_elements.end();
}
if (m_dirty || m_cursor == m_elements.end())
{
if( m_elements.size() == 1)
{
// Special case when size is single element, it will just dup a lot
//return this->toTree(m_singleElement);
return m_elements.begin();
}
// Out of elements and the size is not 1, so we cannot assume
// that we just duplicate the entry n times (such as ID ent+ -> ^(ID ent)+)
// This means we ran out of elements earlier than was expected.
//
return m_elements.end(); // Caller must cope with this (TODO throw RewriteEmptyStreamException)
}
// More than just a single element so we extract it from the
// vector.
return m_cursor++;
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::ElementType
RewriteRuleTokenStream<ImplTraits>::nextTree()
{
ANTLR_UINT32 n = this->size();
if ( m_dirty || ( (m_cursor >=n) && (n==1)) )
{
// if out of elements and size is 1, dup
typename ElementsType::iterator el = this->_next();
return this->dup(*el);
}
// test size above then fetch
typename ElementsType::iterator el = this->_next();
return *el;
}
/*
template<class ImplTraits, class SuperType>
typename RewriteRuleTokenStream<ImplTraits, SuperType>::TokenType*
RewriteRuleTokenStream<ImplTraits, SuperType>::nextToken()
{
return this->_next();
}
template<class ImplTraits, class SuperType>
typename RewriteRuleTokenStream<ImplTraits, SuperType>::TokenType*
RewriteRuleTokenStream<ImplTraits, SuperType>::next()
{
ANTLR_UINT32 s;
s = this->size();
if ( (m_cursor >= s) && (s == 1) )
{
TreeTypePtr el;
el = this->_next();
return this->dup(el);
}
return this->_next();
}
*/
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::ElementType*
RewriteRuleTokenStream<ImplTraits>::dup( ElementType* element)
{
return dupImpl(element);
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::ElementType*
RewriteRuleTokenStream<ImplTraits>::dupImpl( typename ImplTraits::CommonTokenType* /*element*/)
{
return NULL; // TODO throw here
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::ElementType*
RewriteRuleTokenStream<ImplTraits>::dupImpl( typename ImplTraits::TreeTypePtr element)
{
return m_adaptor->dupTree(element);
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::TreeTypePtr
RewriteRuleTokenStream<ImplTraits>::toTree(const ElementType* element)
{
return m_adaptor->create(element);
}
template<class ImplTraits>
bool
RewriteRuleTokenStream<ImplTraits>::hasNext()
{
return m_cursor != m_elements.end();
}
template<class ImplTraits >
typename RewriteRuleTokenStream<ImplTraits>::TreeTypePtr
RewriteRuleTokenStream<ImplTraits>::nextNode()
{
const TokenType *Token = this->nextToken();
return m_adaptor->create(Token);
}
/// Number of elements available in the stream
///
template<class ImplTraits>
ANTLR_UINT32 RewriteRuleTokenStream<ImplTraits>::size()
{
return (ANTLR_UINT32)(m_elements.size());
}
template<class ImplTraits>
typename RewriteRuleTokenStream<ImplTraits>::StringType
RewriteRuleTokenStream<ImplTraits>::getDescription()
{
if ( m_elementDescription.empty() )
{
m_elementDescription = "<unknown source>";
}
return m_elementDescription;
}
template<class ImplTraits>
RewriteRuleTokenStream<ImplTraits>::~RewriteRuleTokenStream()
{
// Before placing the stream back in the pool, we
// need to clear any vector it has. This is so any
// free pointers that are associated with the
// entries are called. However, if this particular function is called
// then we know that the entries in the stream are definitely
// tree nodes. Hence we check to see if any of them were nilNodes as
// if they were, we can reuse them.
//
// We have some elements to traverse
//
for (ANTLR_UINT32 i = 0; i < m_elements.size(); i++)
{
const ElementType *tree = m_elements.at(i);
//if ( (tree != NULL) && tree->isNilNode() )
{
// Had to remove this for now, check is not comprehensive enough
// tree->reuse(tree);
}
}
m_elements.clear();
}
template<class ImplTraits>
const typename RewriteRuleTokenStream<ImplTraits>::TokenType*
RewriteRuleTokenStream<ImplTraits>::nextToken()
{
auto retval = this->_next();
if (retval == m_elements.end())
return NULL;
else
return *retval;
}
}
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