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
29class Command {
30public:
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
38private:
39    BuiltinFunction func_;
40    std::vector<std::string> args_;
41    std::string filename_;
42    int line_;
43};
44
45class Action {
46public:
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
67    bool oneshot() const { return oneshot_; }
68    static void set_function_map(const KeywordMap<BuiltinFunction>* function_map) {
69        function_map_ = function_map;
70    }
71
72
73private:
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
86class Trigger {
87public:
88    virtual ~Trigger() { }
89    virtual bool CheckTriggers(const Action& action) const = 0;
90};
91
92class ActionManager {
93public:
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
105private:
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
117class ActionParser : public SectionParser {
118public:
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;
127    void EndFile(const std::string&) override {
128    }
129private:
130    std::unique_ptr<Action> action_;
131};
132
133#endif
134