115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
// leaf_node.hpp
|
|
// Copyright (c) 2005-2012 Ben Hanson (http://www.benhanson.net/)
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
#ifndef LEXERTL_LEAF_NODE_HPP
|
|
#define LEXERTL_LEAF_NODE_HPP
|
|
|
|
#include "../../enums.hpp" // null_token
|
|
#include "node.hpp"
|
|
#include "../../size_t.hpp"
|
|
|
|
namespace lexertl
|
|
{
|
|
namespace detail
|
|
{
|
|
template<typename id_type>
|
|
class basic_leaf_node : public basic_node<id_type>
|
|
{
|
|
public:
|
|
typedef basic_node<id_type> node;
|
|
typedef typename node::bool_stack bool_stack;
|
|
typedef typename node::const_node_stack const_node_stack;
|
|
typedef typename node::node_ptr_vector node_ptr_vector;
|
|
typedef typename node::node_stack node_stack;
|
|
typedef typename node::node_type node_type;
|
|
typedef typename node::node_vector node_vector;
|
|
|
|
basic_leaf_node (const id_type token_, const bool greedy_) :
|
|
basic_node<id_type> (token_ == node::null_token ()),
|
|
_token (token_),
|
|
_set_greedy (!greedy_),
|
|
_greedy (greedy_),
|
|
_followpos ()
|
|
{
|
|
if (!node::_nullable)
|
|
{
|
|
node::_firstpos.push_back (this);
|
|
node::_lastpos.push_back (this);
|
|
}
|
|
}
|
|
|
|
virtual ~basic_leaf_node ()
|
|
{
|
|
}
|
|
|
|
virtual void append_followpos (const node_vector &followpos_)
|
|
{
|
|
for (typename node_vector::const_iterator iter_ = followpos_.begin (),
|
|
end_ = followpos_.end (); iter_ != end_; ++iter_)
|
|
{
|
|
_followpos.push_back (*iter_);
|
|
}
|
|
}
|
|
|
|
virtual node_type what_type () const
|
|
{
|
|
return node::LEAF;
|
|
}
|
|
|
|
virtual bool traverse (const_node_stack &/*node_stack_*/,
|
|
bool_stack &/*perform_op_stack_*/) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
virtual id_type token () const
|
|
{
|
|
return _token;
|
|
}
|
|
|
|
virtual void greedy (const bool greedy_)
|
|
{
|
|
if (!_set_greedy)
|
|
{
|
|
_greedy = greedy_;
|
|
_set_greedy = true;
|
|
}
|
|
}
|
|
|
|
virtual bool greedy () const
|
|
{
|
|
return _greedy;
|
|
}
|
|
|
|
virtual const node_vector &followpos () const
|
|
{
|
|
return _followpos;
|
|
}
|
|
|
|
virtual node_vector &followpos ()
|
|
{
|
|
return _followpos;
|
|
}
|
|
|
|
private:
|
|
id_type _token;
|
|
bool _set_greedy;
|
|
bool _greedy;
|
|
node_vector _followpos;
|
|
|
|
virtual void copy_node (node_ptr_vector &node_ptr_vector_,
|
|
node_stack &new_node_stack_, bool_stack &/*perform_op_stack_*/,
|
|
bool &/*down_*/) const
|
|
{
|
|
node_ptr_vector_->push_back (static_cast<basic_leaf_node *>(0));
|
|
node_ptr_vector_->back () = new basic_leaf_node (_token, _greedy);
|
|
new_node_stack_.push (node_ptr_vector_->back ());
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
#endif
|