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	schoenebeck	2515	/*
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			}