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// selection_node.hpp // Copyright (c) 2007-2009 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 BOOST_SPIRIT_SUPPORT_DETAIL_LEXER_PARSER_TREE_SELECTION_NODE_HPP #define BOOST_SPIRIT_SUPPORT_DETAIL_LEXER_PARSER_TREE_SELECTION_NODE_HPP #include "node.hpp" namespace boost { namespace lexer { namespace detail { class selection_node : public node { public: selection_node (node *left_, node *right_) : node (left_->nullable () || right_->nullable ()), _left (left_), _right (right_) { _left->append_firstpos (_firstpos); _right->append_firstpos (_firstpos); _left->append_lastpos (_lastpos); _right->append_lastpos (_lastpos); } virtual ~selection_node () { } virtual type what_type () const { return SELECTION; } virtual bool traverse (const_node_stack &node_stack_, bool_stack &perform_op_stack_) const { perform_op_stack_.push (true); switch (_right->what_type ()) { case SEQUENCE: case SELECTION: case ITERATION: perform_op_stack_.push (false); break; default: break; } node_stack_.push (_right); node_stack_.push (_left); return true; } private: // Not owner of these pointers... node *_left; node *_right; virtual void copy_node (node_ptr_vector &node_ptr_vector_, node_stack &new_node_stack_, bool_stack &perform_op_stack_, bool &down_) const { if (perform_op_stack_.top ()) { node *rhs_ = new_node_stack_.top (); new_node_stack_.pop (); node *lhs_ = new_node_stack_.top (); node_ptr_vector_->push_back (static_cast<selection_node *>(0)); node_ptr_vector_->back () = new selection_node (lhs_, rhs_); new_node_stack_.top () = node_ptr_vector_->back (); } else { down_ = true; } perform_op_stack_.pop (); } }; } } } #endif
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