src/shell/KeyboardReader.cpp

/*
 * LSCP Shell
 *
 * Copyright (c) 2014 Christian Schoenebeck
 *
 * This program is part of LinuxSampler and released under the same terms.
 */

#include "KeyboardReader.h"

static KeyboardReader* g_singleton = NULL;
static int g_instanceCount = 0;

KeyboardReader::KeyboardReader() : Thread(false, false, 1, -1),
    m_originalTerminalSetting(TerminalCtrl::now()),
    m_callback(NULL), m_doCallback(true)
{
    if (!g_instanceCount) g_singleton = this;
    g_instanceCount++;
    TerminalCtrl::echoInput(false);
}

KeyboardReader::~KeyboardReader() {
    TerminalCtrl::restore(m_originalTerminalSetting);
    // ensures that no temporary copy objects delete the global reference
    g_instanceCount--;
    if (!g_instanceCount) g_singleton = NULL;
}

void KeyboardReader::setCallback(Callback_t fn) {
    m_callback = fn;
}

void KeyboardReader::callback(bool b) {
    m_doCallback = b;
}

int KeyboardReader::Main() {
    while (true) {
        std::vector<char> v = TerminalCtrl::getChars(1, 1);
        if (!v.empty()) {
            m_fifoMutex.Lock();
            m_fifo.push_back(v[0]);
            if (m_sync.GetUnsafe()) {
                bool delimiterReceived = false;
                for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) {
                    if ((*it) == m_syncDelimiter) {
                        delimiterReceived = true;
                        break;
                    }
                }
                m_fifoMutex.Unlock();
                if (delimiterReceived) m_sync.Set(false);
            } else {
                m_fifoMutex.Unlock();
                if (m_callback && m_doCallback) (*m_callback)(this);
            }
        }
        TestCancel();
    }
    return 0; // just to avoid a warning with some old compilers
}

bool KeyboardReader::charAvailable() const {
    return !m_fifo.empty(); // is thread safe
}

char KeyboardReader::popChar() {
    LockGuard lock(m_fifoMutex);
    if (m_fifo.empty()) return 0;
    char c = m_fifo.front();
    m_fifo.pop_front();
    return c;
}

std::string KeyboardReader::popStringToDelimiterSync(char delimiter, bool includeDelimiter) {
    m_syncDelimiter = delimiter;
    
    bool alreadyReceived = false;
    m_fifoMutex.Lock();
    for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) {
        if ((*it)== delimiter) {
            alreadyReceived = true;
            break;
        }
    }
    if (!alreadyReceived) m_sync.Set(true);
    m_fifoMutex.Unlock();
    if (!alreadyReceived) m_sync.WaitAndUnlockIf(true);

    // if we are here, then there is now a string with the requested delimiter
    // in the FIFO
    std::string s;
    while (charAvailable()) {
        char c = popChar();
        if (includeDelimiter || c != delimiter) s += c;
        if (c == delimiter) return s;
    }
    return s;
}

void KeyboardReader::startReading() {
    StartThread();
}

void KeyboardReader::stopReading() {
    StopThread();
}

KeyboardReader* KeyboardReader::singleton() {
    return g_singleton;
}
1	/*
2	* LSCP Shell
3	*
4	* Copyright (c) 2014 Christian Schoenebeck
5	*
6	* This program is part of LinuxSampler and released under the same terms.
7	*/
8
9	#include "KeyboardReader.h"
10
11	static KeyboardReader* g_singleton = NULL;
12	static int g_instanceCount = 0;
13
14	KeyboardReader::KeyboardReader() : Thread(false, false, 1, -1),
15	m_originalTerminalSetting(TerminalCtrl::now()),
16	m_callback(NULL), m_doCallback(true)
17	{
18	if (!g_instanceCount) g_singleton = this;
19	g_instanceCount++;
20	TerminalCtrl::echoInput(false);
21	}
22
23	KeyboardReader::~KeyboardReader() {
24	TerminalCtrl::restore(m_originalTerminalSetting);
25	// ensures that no temporary copy objects delete the global reference
26	g_instanceCount--;
27	if (!g_instanceCount) g_singleton = NULL;
28	}
29
30	void KeyboardReader::setCallback(Callback_t fn) {
31	m_callback = fn;
32	}
33
34	void KeyboardReader::callback(bool b) {
35	m_doCallback = b;
36	}
37
38	int KeyboardReader::Main() {
39	while (true) {
40	std::vector<char> v = TerminalCtrl::getChars(1, 1);
41	if (!v.empty()) {
42	m_fifoMutex.Lock();
43	m_fifo.push_back(v[0]);
44	if (m_sync.GetUnsafe()) {
45	bool delimiterReceived = false;
46	for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) {
47	if ((*it) == m_syncDelimiter) {
48	delimiterReceived = true;
49	break;
50	}
51	}
52	m_fifoMutex.Unlock();
53	if (delimiterReceived) m_sync.Set(false);
54	} else {
55	m_fifoMutex.Unlock();
56	if (m_callback && m_doCallback) (*m_callback)(this);
57	}
58	}
59	TestCancel();
60	}
61	return 0; // just to avoid a warning with some old compilers
62	}
63
64	bool KeyboardReader::charAvailable() const {
65	return !m_fifo.empty(); // is thread safe
66	}
67
68	char KeyboardReader::popChar() {
69	LockGuard lock(m_fifoMutex);
70	if (m_fifo.empty()) return 0;
71	char c = m_fifo.front();
72	m_fifo.pop_front();
73	return c;
74	}
75
76	std::string KeyboardReader::popStringToDelimiterSync(char delimiter, bool includeDelimiter) {
77	m_syncDelimiter = delimiter;
78
79	bool alreadyReceived = false;
80	m_fifoMutex.Lock();
81	for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) {
82	if ((*it)== delimiter) {
83	alreadyReceived = true;
84	break;
85	}
86	}
87	if (!alreadyReceived) m_sync.Set(true);
88	m_fifoMutex.Unlock();
89	if (!alreadyReceived) m_sync.WaitAndUnlockIf(true);
90
91	// if we are here, then there is now a string with the requested delimiter
92	// in the FIFO
93	std::string s;
94	while (charAvailable()) {
95	char c = popChar();
96	if (includeDelimiter \|\| c != delimiter) s += c;
97	if (c == delimiter) return s;
98	}
99	return s;
100	}
101
102	void KeyboardReader::startReading() {
103	StartThread();
104	}
105
106	void KeyboardReader::stopReading() {
107	StopThread();
108	}
109
110	KeyboardReader* KeyboardReader::singleton() {
111	return g_singleton;
112	}