1// leaf_node.hpp
2// Copyright (c) 2007-2009 Ben Hanson (http://www.benhanson.net/)
3//
4// Distributed under the Boost Software License, Version 1.0. (See accompanying
5// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6#ifndef BOOST_SPIRIT_SUPPORT_DETAIL_LEXER_PARSER_TREE_LEAF_NODE_HPP
7#define BOOST_SPIRIT_SUPPORT_DETAIL_LEXER_PARSER_TREE_LEAF_NODE_HPP
8
9#include "../../consts.hpp" // null_token
10#include "node.hpp"
11#include "../../size_t.hpp"
12
13namespace boost
14{
15namespace lexer
16{
17namespace detail
18{
19class leaf_node : public node
20{
21public:
22 leaf_node (const std::size_t token_, const bool greedy_) :
23 node (token_ == null_token),
24 _token (token_),
25 _set_greedy (!greedy_),
26 _greedy (greedy_)
27 {
28 if (!_nullable)
29 {
30 _firstpos.push_back (x: this);
31 _lastpos.push_back (x: this);
32 }
33 }
34
35 virtual ~leaf_node ()
36 {
37 }
38
39 virtual void append_followpos (const node_vector &followpos_)
40 {
41 for (node_vector::const_iterator iter_ = followpos_.begin (),
42 end_ = followpos_.end (); iter_ != end_; ++iter_)
43 {
44 _followpos.push_back (x: *iter_);
45 }
46 }
47
48 virtual type what_type () const
49 {
50 return LEAF;
51 }
52
53 virtual bool traverse (const_node_stack &/*node_stack_*/,
54 bool_stack &/*perform_op_stack_*/) const
55 {
56 return false;
57 }
58
59 virtual std::size_t token () const
60 {
61 return _token;
62 }
63
64 virtual void greedy (const bool greedy_)
65 {
66 if (!_set_greedy)
67 {
68 _greedy = greedy_;
69 _set_greedy = true;
70 }
71 }
72
73 virtual bool greedy () const
74 {
75 return _greedy;
76 }
77
78 virtual const node_vector &followpos () const
79 {
80 return _followpos;
81 }
82
83 virtual node_vector &followpos ()
84 {
85 return _followpos;
86 }
87
88private:
89 std::size_t _token;
90 bool _set_greedy;
91 bool _greedy;
92 node_vector _followpos;
93
94 virtual void copy_node (node_ptr_vector &node_ptr_vector_,
95 node_stack &new_node_stack_, bool_stack &/*perform_op_stack_*/,
96 bool &/*down_*/) const
97 {
98 node_ptr_vector_->push_back (x: static_cast<leaf_node *>(0));
99 node_ptr_vector_->back () = new leaf_node (_token, _greedy);
100 new_node_stack_.push (x: node_ptr_vector_->back ());
101 }
102};
103}
104}
105}
106
107#endif
108

source code of boost/libs/spirit/include/boost/spirit/home/support/detail/lexer/parser/tree/leaf_node.hpp