1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _INIT_ACTION_H
18 #define _INIT_ACTION_H
19 
20 #include <map>
21 #include <queue>
22 #include <string>
23 #include <vector>
24 
25 #include "builtins.h"
26 #include "init_parser.h"
27 #include "keyword_map.h"
28 
29 class Command {
30 public:
31     Command(BuiltinFunction f, const std::vector<std::string>& args,
32             const std::string& filename, int line);
33 
34     int InvokeFunc() const;
35     std::string BuildCommandString() const;
36     std::string BuildSourceString() const;
37 
38 private:
39     BuiltinFunction func_;
40     std::vector<std::string> args_;
41     std::string filename_;
42     int line_;
43 };
44 
45 class Action {
46 public:
47     Action(bool oneshot = false);
48 
49     bool AddCommand(const std::vector<std::string>& args,
50                     const std::string& filename, int line, std::string* err);
51     void AddCommand(BuiltinFunction f,
52                     const std::vector<std::string>& args,
53                     const std::string& filename = "", int line = 0);
54     void CombineAction(const Action& action);
55     bool InitTriggers(const std::vector<std::string>& args, std::string* err);
56     bool InitSingleTrigger(const std::string& trigger);
57     std::size_t NumCommands() const;
58     void ExecuteOneCommand(std::size_t command) const;
59     void ExecuteAllCommands() const;
60     bool CheckEventTrigger(const std::string& trigger) const;
61     bool CheckPropertyTrigger(const std::string& name,
62                               const std::string& value) const;
63     bool TriggersEqual(const Action& other) const;
64     std::string BuildTriggersString() const;
65     void DumpState() const;
66 
oneshot()67     bool oneshot() const { return oneshot_; }
set_function_map(const KeywordMap<BuiltinFunction> * function_map)68     static void set_function_map(const KeywordMap<BuiltinFunction>* function_map) {
69         function_map_ = function_map;
70     }
71 
72 
73 private:
74     void ExecuteCommand(const Command& command) const;
75     bool CheckPropertyTriggers(const std::string& name = "",
76                                const std::string& value = "") const;
77     bool ParsePropertyTrigger(const std::string& trigger, std::string* err);
78 
79     std::map<std::string, std::string> property_triggers_;
80     std::string event_trigger_;
81     std::vector<Command> commands_;
82     bool oneshot_;
83     static const KeywordMap<BuiltinFunction>* function_map_;
84 };
85 
86 class Trigger {
87 public:
~Trigger()88     virtual ~Trigger() { }
89     virtual bool CheckTriggers(const Action& action) const = 0;
90 };
91 
92 class ActionManager {
93 public:
94     static ActionManager& GetInstance();
95 
96     void AddAction(std::unique_ptr<Action> action);
97     void QueueEventTrigger(const std::string& trigger);
98     void QueuePropertyTrigger(const std::string& name, const std::string& value);
99     void QueueAllPropertyTriggers();
100     void QueueBuiltinAction(BuiltinFunction func, const std::string& name);
101     void ExecuteOneCommand();
102     bool HasMoreCommands() const;
103     void DumpState() const;
104 
105 private:
106     ActionManager();
107 
108     ActionManager(ActionManager const&) = delete;
109     void operator=(ActionManager const&) = delete;
110 
111     std::vector<std::unique_ptr<Action>> actions_;
112     std::queue<std::unique_ptr<Trigger>> trigger_queue_;
113     std::queue<const Action*> current_executing_actions_;
114     std::size_t current_command_;
115 };
116 
117 class ActionParser : public SectionParser {
118 public:
ActionParser()119     ActionParser() : action_(nullptr) {
120     }
121     bool ParseSection(const std::vector<std::string>& args,
122                       std::string* err) override;
123     bool ParseLineSection(const std::vector<std::string>& args,
124                           const std::string& filename, int line,
125                           std::string* err) const override;
126     void EndSection() override;
EndFile(const std::string &)127     void EndFile(const std::string&) override {
128     }
129 private:
130     std::unique_ptr<Action> action_;
131 };
132 
133 #endif
134