]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | // Copyright (c) 2001-2011 Hartmut Kaiser |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #if !defined(BOOST_SPIRIT_LEX_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM) | |
7 | #define BOOST_SPIRIT_LEX_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM | |
8 | ||
9 | #if defined(_MSC_VER) | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/spirit/home/lex/lexer/pass_flags.hpp> | |
14 | #include <boost/mpl/bool.hpp> | |
15 | #include <boost/function.hpp> | |
16 | #include <vector> | |
17 | ||
18 | namespace boost { namespace spirit { namespace lex { namespace lexertl | |
19 | { | |
20 | namespace detail | |
21 | { | |
22 | /////////////////////////////////////////////////////////////////////// | |
23 | template <typename Iterator, typename SupportsState, typename Data> | |
24 | struct semantic_actions; | |
25 | ||
26 | // This specialization of semantic_actions will be used if the token | |
27 | // type (lexer definition) does not support states, which simplifies | |
28 | // the data structures used to store the semantic action function | |
29 | // objects. | |
30 | template <typename Iterator, typename Data> | |
31 | struct semantic_actions<Iterator, mpl::false_, Data> | |
32 | { | |
33 | typedef void functor_type(Iterator&, Iterator& | |
34 | , BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&); | |
35 | typedef boost::function<functor_type> functor_wrapper_type; | |
36 | ||
37 | // add a semantic action function object | |
38 | template <typename F> | |
39 | void add_action(std::size_t unique_id, std::size_t, F act) | |
40 | { | |
41 | if (actions_.size() <= unique_id) | |
42 | actions_.resize(unique_id + 1); | |
43 | ||
44 | actions_[unique_id] = act; | |
45 | } | |
46 | ||
47 | // try to invoke a semantic action for the given token (unique_id) | |
48 | BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t /*state*/ | |
49 | , std::size_t& id, std::size_t unique_id, Iterator& end | |
50 | , Data& data) const | |
51 | { | |
52 | // if there is nothing to invoke, continue with 'match' | |
53 | if (unique_id >= actions_.size() || !actions_[unique_id]) | |
54 | return pass_flags::pass_normal; | |
55 | ||
56 | // Note: all arguments might be changed by the invoked semantic | |
57 | // action | |
58 | BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal; | |
59 | actions_[unique_id](data.get_first(), end, match, id, data); | |
60 | return match; | |
61 | } | |
62 | ||
63 | std::vector<functor_wrapper_type> actions_; | |
64 | }; | |
65 | ||
66 | // This specialization of semantic_actions will be used if the token | |
67 | // type (lexer definition) needs to support states, resulting in a more | |
68 | // complex data structure needed for storing the semantic action | |
69 | // function objects. | |
70 | template <typename Iterator, typename Data> | |
71 | struct semantic_actions<Iterator, mpl::true_, Data> | |
72 | { | |
73 | typedef void functor_type(Iterator&, Iterator& | |
74 | , BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&); | |
75 | typedef boost::function<functor_type> functor_wrapper_type; | |
76 | ||
77 | // add a semantic action function object | |
78 | template <typename F> | |
79 | void add_action(std::size_t unique_id, std::size_t state, F act) | |
80 | { | |
81 | if (actions_.size() <= state) | |
82 | actions_.resize(state + 1); | |
83 | ||
84 | std::vector<functor_wrapper_type>& actions (actions_[state]); | |
85 | if (actions.size() <= unique_id) | |
86 | actions.resize(unique_id + 1); | |
87 | ||
88 | actions[unique_id] = act; | |
89 | } | |
90 | ||
91 | // try to invoke a semantic action for the given token (unique_id) | |
92 | BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t state | |
93 | , std::size_t& id, std::size_t unique_id, Iterator& end | |
94 | , Data& data) const | |
95 | { | |
96 | // if there is no action defined for this state, return match | |
97 | if (state >= actions_.size()) | |
98 | return pass_flags::pass_normal; | |
99 | ||
100 | // if there is nothing to invoke, continue with 'match' | |
101 | std::vector<functor_wrapper_type> const& actions = actions_[state]; | |
102 | if (unique_id >= actions.size() || !actions[unique_id]) | |
103 | return pass_flags::pass_normal; | |
104 | ||
105 | // set token value | |
106 | data.set_end(end); | |
107 | ||
108 | // Note: all arguments might be changed by the invoked semantic | |
109 | // action | |
110 | BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal; | |
111 | actions[unique_id](data.get_first(), end, match, id, data); | |
112 | return match; | |
113 | } | |
114 | ||
115 | std::vector<std::vector<functor_wrapper_type> > actions_; | |
116 | }; | |
117 | } | |
118 | ||
119 | }}}} | |
120 | ||
121 | #endif |