eric6/Debugger/DebugServer.py

# -*- coding: utf-8 -*-

# Copyright (c) 2007 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the debug server.
"""

import os
import shlex

from PyQt5.QtCore import pyqtSignal, pyqtSlot, QModelIndex
from PyQt5.QtNetwork import (
    QTcpServer, QHostAddress, QHostInfo, QNetworkInterface
)

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from .BreakPointModel import BreakPointModel
from .WatchPointModel import WatchPointModel
from . import DebugClientCapabilities

import Preferences


DebuggerInterfaces = {
    "Python": "DebuggerInterfacePython",
    "None": "DebuggerInterfaceNone",
}


class DebugServer(QTcpServer):
    """
    Class implementing the debug server embedded within the IDE.
    
    @signal clientProcessStdout(str) emitted after the client has sent some
        output via stdout
    @signal clientProcessStderr(str) emitted after the client has sent some
        output via stderr
    @signal clientOutput(str) emitted after the client has sent some output
    @signal clientRawInputSent(debuggerId) emitted after the data was sent
        to the indicated debug client
    @signal clientLine(filename, lineno, debuggerId, threadName, forStack)
        emitted after the debug client has executed a line of code
    @signal clientStack(stack, debuggerId, threadName) emitted after the
        debug client has executed a line of code
    @signal clientThreadList(currentId, threadList, debuggerId) emitted after
        a thread list has been received
    @signal clientThreadSet(debuggerId) emitted after the client has
        acknowledged the change of the current thread
    @signal clientVariables(scope, variables, debuggerId) emitted after a
        variables dump has been received
    @signal clientVariable(scope, variables, debuggerId) emitted after a dump
        for one class variable has been received
    @signal clientStatement(continue, debuggerId) emitted after an interactive
        command has been executed. The parameter is False to indicate that the
        command is complete and True if it needs more input.
    @signal clientDisassembly(disassembly, debuggerId) emitted after the client
        has sent a disassembly of the code raising an exception
    @signal clientException(exceptionType, exceptionMessage, stackTrace,
        debuggerId, threadName) emitted after an exception occured on the
        client side
    @signal clientSyntaxError(message, filename, linenumber, characternumber,
        debuggerId, threadName) emitted after a syntax error has been detected
        on the client side
    @signal clientSignal(message, filename, linenumber, function name,
        function arguments, debuggerId) emitted after a signal has been
        generated on the client side
    @signal clientDisconnected(str) emitted after a debug client has
        disconnected (i.e. closed the network socket)
    @signal clientExit(str, int, str, bool, str) emitted after the client has
        exited giving the program name, the exit status, an exit message, an
        indication to be quiet and the ID of the exited client
    @signal lastClientExited() emitted to indicate that the last connected
        debug client has terminated
    @signal clientClearBreak(filename, lineno, debuggerId) emitted after the
        debug client has decided to clear a temporary breakpoint
    @signal clientBreakConditionError(fn, lineno, debuggerId) emitted after the
        client has signaled a syntax error in a breakpoint condition
    @signal clientClearWatch(condition, debuggerId) emitted after the debug
        client has decided to clear a temporary watch expression
    @signal clientWatchConditionError(condition, debuggerId) emitted after the
        client has signaled a syntax error in a watch expression
    @signal clientRawInput(prompt, echo, debuggerId) emitted after a raw input
        request was received
    @signal clientBanner(version, platform, venvname) emitted after
        the client banner data was received
    @signal clientCapabilities(capabilities, cltype, venvname) emitted after
        the clients capabilities were received
    @signal clientCompletionList(completionList, text) emitted after the
        commandline completion list and the reworked search string was
        received from the client
    @signal passiveDebugStarted(str, bool) emitted after the debug client has
        connected in passive debug mode
    @signal clientGone(bool) emitted if the client went away (planned or
        unplanned)
    @signal clientInterpreterChanged(str) emitted to signal a change of the
        client interpreter
    @signal utDiscovered(testCases, exc_type, exc_value) emitted after the
        client has performed a test case discovery action
    @signal utPrepared(nrTests, exc_type, exc_value) emitted after the client
        has loaded a unittest suite
    @signal utFinished() emitted after the client signalled the end of the
        unittest
    @signal utStartTest(testname, testdocu) emitted after the client has
        started a test
    @signal utStopTest() emitted after the client has finished a test
    @signal utTestFailed(testname, exc_info, id) emitted after the client
        reported a failed test
    @signal utTestErrored(testname, exc_info, id) emitted after the client
        reported an errored test
    @signal utTestSkipped(testname, reason, id) emitted after the client
        reported a skipped test
    @signal utTestFailedExpected(testname, exc_info, id) emitted after the
        client reported an expected test failure
    @signal utTestSucceededUnexpected(testname, id) emitted after the client
        reported an unexpected test success
    @signal callTraceInfo emitted after the client reported the call trace
        data (isCall, fromFile, fromLine, fromFunction, toFile, toLine,
        toFunction, debuggerId)
    @signal appendStdout(msg) emitted when a passive debug connection is
        established or lost
    @signal clientDebuggerId(debuggerId) emitted to indicate a newly connected
        debugger backend
    """
    clientClearBreak = pyqtSignal(str, int, str)
    clientClearWatch = pyqtSignal(str, str)
    clientGone = pyqtSignal(bool)
    clientProcessStdout = pyqtSignal(str)
    clientProcessStderr = pyqtSignal(str)
    clientRawInputSent = pyqtSignal(str)
    clientOutput = pyqtSignal(str)
    clientLine = pyqtSignal(str, int, str, str, bool)
    clientStack = pyqtSignal(list, str, str)
    clientThreadList = pyqtSignal('PyQt_PyObject', list, str)
    clientThreadSet = pyqtSignal(str)
    clientVariables = pyqtSignal(int, list, str)
    clientVariable = pyqtSignal(int, list, str)
    clientStatement = pyqtSignal(bool, str)
    clientDisassembly = pyqtSignal(dict, str)
    clientException = pyqtSignal(str, str, list, str, str)
    clientSyntaxError = pyqtSignal(str, str, int, int, str, str)
    clientSignal = pyqtSignal(str, str, int, str, str, str)
    clientDisconnected = pyqtSignal(str)
    clientExit = pyqtSignal(str, int, str, bool, str)
    lastClientExited = pyqtSignal()
    clientBreakConditionError = pyqtSignal(str, int, str)
    clientWatchConditionError = pyqtSignal(str, str)
    clientRawInput = pyqtSignal(str, bool, str)
    clientBanner = pyqtSignal(str, str, str)
    clientCapabilities = pyqtSignal(int, str, str)
    clientCompletionList = pyqtSignal(list, str)
    clientInterpreterChanged = pyqtSignal(str)
    clientDebuggerId = pyqtSignal(str)
    utDiscovered = pyqtSignal(list, str, str)
    utPrepared = pyqtSignal(int, str, str)
    utStartTest = pyqtSignal(str, str)
    utStopTest = pyqtSignal()
    utTestFailed = pyqtSignal(str, str, str)
    utTestErrored = pyqtSignal(str, str, str)
    utTestSkipped = pyqtSignal(str, str, str)
    utTestFailedExpected = pyqtSignal(str, str, str)
    utTestSucceededUnexpected = pyqtSignal(str, str)
    utFinished = pyqtSignal()
    passiveDebugStarted = pyqtSignal(str, bool)
    callTraceInfo = pyqtSignal(bool, str, str, str, str, str, str, str)
    appendStdout = pyqtSignal(str)
    
    def __init__(self, originalPathString, preventPassiveDebugging=False):
        """
        Constructor
        
        @param originalPathString original PATH environment variable
        @type str
        @param preventPassiveDebugging flag overriding the PassiveDbgEnabled
            setting
        @type bool
        """
        super(DebugServer, self).__init__()
        
        self.__originalPathString = originalPathString
        
        self.__debuggerInterfaces = {}
        # the interface name is the key, a function to get the
        # registration data is the value
        self.__debuggerInterfaceRegistry = {}
        # the client language is the key, a list containing the client
        # capabilities, a list of associated file extensions, a
        # function reference to create the debugger interface (see
        # __createDebuggerInterface() below) and the interface name is
        # the value
        
        # create our models
        self.breakpointModel = BreakPointModel(self)
        self.watchpointModel = WatchPointModel(self)
        self.watchSpecialCreated = self.tr(
            "created", "must be same as in EditWatchpointDialog")
        self.watchSpecialChanged = self.tr(
            "changed", "must be same as in EditWatchpointDialog")
        
        # arrays to track already reported issues
        self.__reportedBreakpointIssues = []
        self.__reportedWatchpointIssues = []
        
        self.networkInterface = Preferences.getDebugger("NetworkInterface")
        if self.networkInterface == "all":
            hostAddress = QHostAddress("0.0.0.0")  # QHostAddress.Any)  # secok
        elif self.networkInterface == "allv6":
            hostAddress = QHostAddress("::")  # QHostAddress.AnyIPv6)
        else:
            hostAddress = QHostAddress(self.networkInterface)
        self.networkInterfaceName, self.networkInterfaceIndex = (
            self.__getNetworkInterfaceAndIndex(self.networkInterface))
        
        if (not preventPassiveDebugging and
                Preferences.getDebugger("PassiveDbgEnabled")):
            sock = Preferences.getDebugger("PassiveDbgPort")  # default: 42424
            self.listen(hostAddress, sock)
            self.passive = True
            self.passiveClientExited = False
        else:
            if hostAddress.toString().lower().startswith("fe80"):
                hostAddress.setScopeId(self.networkInterfaceName)
            self.listen(hostAddress)
            self.passive = False
        
        self.debuggerInterface = None
        self.debugging = False
        self.running = False
        self.clientProcess = None
        self.clientInterpreter = ""
        self.clientType = Preferences.Prefs.settings.value('DebugClient/Type')
        if self.clientType is None:
            self.clientType = 'Python3'
        
        self.lastClientType = ''
        self.__autoClearShell = False
        self.__forProject = False
        
        self.clientClearBreak.connect(self.__clientClearBreakPoint)
        self.clientClearWatch.connect(self.__clientClearWatchPoint)
        self.newConnection.connect(self.__newConnection)
        
        self.breakpointModel.rowsAboutToBeRemoved.connect(
            self.__deleteBreakPoints)
        self.breakpointModel.dataAboutToBeChanged.connect(
            self.__breakPointDataAboutToBeChanged)
        self.breakpointModel.dataChanged.connect(self.__changeBreakPoints)
        self.breakpointModel.rowsInserted.connect(self.__addBreakPoints)
        
        self.watchpointModel.rowsAboutToBeRemoved.connect(
            self.__deleteWatchPoints)
        self.watchpointModel.dataAboutToBeChanged.connect(
            self.__watchPointDataAboutToBeChanged)
        self.watchpointModel.dataChanged.connect(self.__changeWatchPoints)
        self.watchpointModel.rowsInserted.connect(self.__addWatchPoints)
        
        self.__maxVariableSize = Preferences.getDebugger("MaxVariableSize")
        
        self.__multiprocessNoDebugList = []
        
        self.__registerDebuggerInterfaces()
    
    def getHostAddress(self, localhost):
        """
        Public method to get the IP address or hostname the debug server is
        listening.
        
        @param localhost flag indicating to return the address for localhost
        @type bool
        @return IP address or hostname
        @rtype str
        """
        if self.networkInterface == "all":
            if localhost:
                return "127.0.0.1"
            else:
                return "{0}@@v4".format(QHostInfo.localHostName())
        elif self.networkInterface == "allv6":
            if localhost:
                return "::1"
            else:
                return "{0}@@v6".format(QHostInfo.localHostName())
        else:
            return "{0}@@i{1}".format(self.networkInterface,
                                      self.networkInterfaceIndex)
    
    def __getNetworkInterfaceAndIndex(self, address):
        """
        Private method to determine the network interface and the interface
        index.
        
        @param address address to determine the info for
        @type str
        @return tuple of network interface name and index
        @rtype tuple of (str, int)
        """
        if address not in ["all", "allv6"]:
            for networkInterface in QNetworkInterface.allInterfaces():
                addressEntries = networkInterface.addressEntries()
                if len(addressEntries) > 0:
                    for addressEntry in addressEntries:
                        if (addressEntry.ip().toString().lower() ==
                                address.lower()):
                            return (networkInterface.humanReadableName(),
                                    networkInterface.index())
        
        return "", 0
    
    def preferencesChanged(self):
        """
        Public slot to handle the preferencesChanged signal.
        """
        registeredInterfaces = {}
        for interfaceName in self.__debuggerInterfaces:
            registeredInterfaces[interfaceName] = (
                self.__debuggerInterfaces[interfaceName])
        
        self.__debuggerInterfaceRegistry = {}
        for interfaceName, getRegistryData in registeredInterfaces.items():
            self.registerDebuggerInterface(interfaceName, getRegistryData,
                                           reregister=True)
        
        self.__maxVariableSize = Preferences.getDebugger("MaxVariableSize")
    
    def registerDebuggerInterface(self, interfaceName, getRegistryData,
                                  reregister=False):
        """
        Public method to register a debugger interface.
        
        @param interfaceName name of the debugger interface
        @type str
        @param getRegistryData reference to a function to be called
            to get the debugger interface details. This method shall
            return the client language, the client capabilities, the
            list of associated file extensions and a function reference
            to create the debugger interface (see __createDebuggerInterface())
        @type function
        @param reregister flag indicating to re-register the interface
        @type bool
        """
        if interfaceName in self.__debuggerInterfaces and not reregister:
            E5MessageBox.warning(
                None,
                self.tr("Register Debugger Interface"),
                self.tr("""<p>The debugger interface <b>{0}</b> has already"""
                        """ been registered. Ignoring this request.</p>"""))
            return
        
        if not reregister:
            self.__debuggerInterfaces[interfaceName] = getRegistryData
        registryDataList = getRegistryData()
        if registryDataList:
            for (clientLanguage, clientCapabilities, clientExtensions,
                 interfaceCreator) in registryDataList:
                self.__debuggerInterfaceRegistry[clientLanguage] = [
                    clientCapabilities, clientExtensions, interfaceCreator,
                    interfaceName]
    
    def unregisterDebuggerInterface(self, interfaceName):
        """
        Public method to unregister a debugger interface.
        
        @param interfaceName interfaceName of the debugger interface
        @type str
        """
        if interfaceName in self.__debuggerInterfaces:
            clientLanguages = []
            for clientLanguage, registryData in (
                    self.__debuggerInterfaceRegistry.items()):
                if interfaceName == registryData[-1]:
                    clientLanguages.append(clientLanguage)
            for clientLanguage in clientLanguages:
                del self.__debuggerInterfaceRegistry[clientLanguage]
            del self.__debuggerInterfaces[interfaceName]
    
    def __findLanguageForExtension(self, ext):
        """
        Private method to get the language associated with a file extension.
        
        @param ext file extension
        @type str
        @return associated language
        @rtype str
        """
        for language in self.__debuggerInterfaceRegistry:
            if ext in self.__debuggerInterfaceRegistry[language][1]:
                return language
        
        return ""
    
    def __registerDebuggerInterfaces(self):
        """
        Private method to register the available internal debugger interfaces.
        """
        for name, interface in DebuggerInterfaces.items():
            modName = "Debugger.{0}".format(interface)
            mod = __import__(modName)
            components = modName.split('.')
            for comp in components[1:]:
                mod = getattr(mod, comp)
            
            self.registerDebuggerInterface(name, mod.getRegistryData)
    
    def getSupportedLanguages(self, shellOnly=False):
        """
        Public slot to return the supported programming languages.
        
        @param shellOnly flag indicating only languages supporting an
            interactive shell should be returned
        @type bool
        @return list of supported languages
        @rtype list of str
        """
        languages = list(self.__debuggerInterfaceRegistry.keys())
        try:
            languages.remove("None")
        except ValueError:
            pass    # it is not in the list
        
        if shellOnly:
            languages = [lang for lang in languages
                         if self.__debuggerInterfaceRegistry[lang][0] &
                         DebugClientCapabilities.HasShell]
        
        return languages[:]
    
    def getExtensions(self, language):
        """
        Public slot to get the extensions associated with the given language.
        
        @param language language to get extensions for
        @type str
        @return tuple of extensions associated with the language
        @rtype tuple of str
        """
        if language in self.__debuggerInterfaceRegistry:
            return tuple(self.__debuggerInterfaceRegistry[language][1])
        else:
            return ()
    
    def __createDebuggerInterface(self, clientType=None):
        """
        Private slot to create the debugger interface object.
        
        @param clientType type of the client interface to be created
        @type str
        """
        if self.lastClientType != self.clientType or clientType is not None:
            if clientType is None:
                clientType = self.clientType
            if clientType in self.__debuggerInterfaceRegistry:
                self.debuggerInterface = (
                    self.__debuggerInterfaceRegistry[clientType][2](
                        self, self.passive))
            else:
                self.debuggerInterface = (
                    self.__debuggerInterfaceRegistry["None"][2](
                        self, self.passive))
                self.clientType = "None"
    
    def __setClientType(self, clType):
        """
        Private method to set the client type.
        
        @param clType type of client to be started
        @type str
        """
        if clType is not None and clType in self.getSupportedLanguages():
            self.clientType = clType
            Preferences.Prefs.settings.setValue(
                'DebugClient/Type', self.clientType)
    
    def startClient(self, unplanned=True, clType=None, forProject=False,
                    runInConsole=False, venvName="", workingDir=None):
        """
        Public method to start a debug client.
        
        @param unplanned flag indicating that the client has died
        @type bool
        @param clType type of client to be started
        @type str
        @param forProject flag indicating a project related action
        @type bool
        @param runInConsole flag indicating to start the debugger in a
            console window
        @type bool
        @param venvName name of the virtual environment to be used
        @type str
        @param workingDir directory to start the debugger client in
        @type str
        """
        self.running = False
        
        if not self.passive or not self.passiveClientExited:
            if self.debuggerInterface and self.debuggerInterface.isConnected():
                self.shutdownServer()
                self.debugging = False
                self.clientGone.emit(unplanned and self.debugging)
        
        if clType:
            if clType not in self.getSupportedLanguages():
                # a not supported client language was requested
                return
            
            self.__setClientType(clType)
        
        # only start the client, if we are not in passive mode
        if not self.passive:
            if self.clientProcess:
                self.clientProcess.kill()
                self.clientProcess.waitForFinished(1000)
                self.clientProcess.deleteLater()
                self.clientProcess = None
            
            self.__forProject = forProject
            self.__createDebuggerInterface()
            if forProject:
                project = e5App().getObject("Project")
                if not project.isDebugPropertiesLoaded():
                    self.clientProcess, isNetworked, clientInterpreter = (
                        self.debuggerInterface.startRemote(
                            self.serverPort(), runInConsole, venvName,
                            self.__originalPathString, workingDir=workingDir))
                else:
                    self.clientProcess, isNetworked, clientInterpreter = (
                        self.debuggerInterface.startRemoteForProject(
                            self.serverPort(), runInConsole, venvName,
                            self.__originalPathString, workingDir=workingDir))
            else:
                self.clientProcess, isNetworked, clientInterpreter = (
                    self.debuggerInterface.startRemote(
                        self.serverPort(), runInConsole, venvName,
                        self.__originalPathString, workingDir=workingDir))
            
            if self.clientProcess:
                self.clientProcess.readyReadStandardError.connect(
                    self.__clientProcessError)
                self.clientProcess.readyReadStandardOutput.connect(
                    self.__clientProcessOutput)
                
                # Perform actions necessary, if client type has changed
                if self.lastClientType != self.clientType:
                    self.lastClientType = self.clientType
                    self.remoteBanner()
                elif self.__autoClearShell:
                    self.__autoClearShell = False
                    self.remoteBanner()
            else:
                if clType and self.lastClientType:
                    self.__setClientType(self.lastClientType)
        else:
            self.__createDebuggerInterface("None")
            clientInterpreter = ""
        
        if clientInterpreter != self.clientInterpreter:
            self.clientInterpreter = clientInterpreter
            self.clientInterpreterChanged.emit(clientInterpreter)
    
    def __clientProcessOutput(self):
        """
        Private slot to process client output received via stdout.
        """
        output = str(self.clientProcess.readAllStandardOutput(),
                     Preferences.getSystem("IOEncoding"),
                     'replace')
        self.clientProcessStdout.emit(output)
    
    def __clientProcessError(self):
        """
        Private slot to process client output received via stderr.
        """
        error = str(self.clientProcess.readAllStandardError(),
                    Preferences.getSystem("IOEncoding"),
                    'replace')
        self.clientProcessStderr.emit(error)
    
    @pyqtSlot(str, int)
    def __clientClearBreakPoint(self, fn, lineno):
        """
        Private slot to handle the clientClearBreak signal.
        
        @param fn filename of breakpoint to clear
        @type str
        @param lineno line number of breakpoint to clear
        @type int
        """
        if self.debugging:
            index = self.breakpointModel.getBreakPointIndex(fn, lineno)
            self.breakpointModel.deleteBreakPointByIndex(index)
            if (fn, lineno) in self.__reportedBreakpointIssues:
                self.__reportedBreakpointIssues.remove((fn, lineno))
    
    def __deleteBreakPoints(self, parentIndex, start, end):
        """
        Private slot to delete breakpoints.
        
        @param parentIndex index of parent item
        @type QModelIndex
        @param start start row
        @type int
        @param end end row
        @type int
        """
        if self.debugging:
            for row in range(start, end + 1):
                index = self.breakpointModel.index(row, 0, parentIndex)
                fn, lineno = (
                    self.breakpointModel.getBreakPointByIndex(index)[0:2])
                # delete the breakpoints of all connected backends
                self.remoteBreakpoint("", fn, lineno, False)
                if (fn, lineno) in self.__reportedBreakpointIssues:
                    self.__reportedBreakpointIssues.remove((fn, lineno))
    
    def __changeBreakPoints(self, startIndex, endIndex):
        """
        Private slot to set changed breakpoints.
        
        @param startIndex starting index of the change breakpoins
        @type QModelIndex
        @param endIndex ending index of the change breakpoins
        @type QModelIndex
        """
        if self.debugging:
            self.__addBreakPoints(
                QModelIndex(), startIndex.row(), endIndex.row())
    
    def __breakPointDataAboutToBeChanged(self, startIndex, endIndex):
        """
        Private slot to handle the dataAboutToBeChanged signal of the
        breakpoint model.
        
        @param startIndex start index of the rows to be changed
        @type QModelIndex
        @param endIndex end index of the rows to be changed
        @type QModelIndex
        """
        if self.debugging:
            self.__deleteBreakPoints(
                QModelIndex(), startIndex.row(), endIndex.row())
    
    def __addBreakPoints(self, parentIndex, start, end, debuggerId=""):
        """
        Private slot to add breakpoints.
        
        @param parentIndex index of parent item
        @type QModelIndex
        @param start start row
        @type int
        @param end end row
        @type int
        @param debuggerId ID of the debugger backend to send to. If this is
            empty, they will be broadcast to all connected backends.
        @type str
        """
        if self.debugging:
            for row in range(start, end + 1):
                index = self.breakpointModel.index(row, 0, parentIndex)
                fn, lineno, cond, temp, enabled, ignorecount = (
                    self.breakpointModel.getBreakPointByIndex(index)[:6])
                
                if (fn, lineno) in self.__reportedBreakpointIssues:
                    self.__reportedBreakpointIssues.remove((fn, lineno))
                
                self.remoteBreakpoint(debuggerId, fn, lineno, True, cond, temp)
                if not enabled:
                    self.__remoteBreakpointEnable(
                        debuggerId, fn, lineno, False)
                if ignorecount:
                    self.__remoteBreakpointIgnore(
                        debuggerId, fn, lineno, ignorecount)
    
    def __makeWatchCondition(self, cond, special):
        """
        Private method to construct the condition string.
        
        @param cond condition
        @type str
        @param special special condition
        @type str
        @return condition string
        @rtype str
        """
        if special == "":
            _cond = cond
        else:
            if special == self.watchSpecialCreated:
                _cond = "{0} ??created??".format(cond)
            elif special == self.watchSpecialChanged:
                _cond = "{0} ??changed??".format(cond)
        return _cond
    
    def __splitWatchCondition(self, cond):
        """
        Private method to split a remote watch expression.
        
        @param cond remote expression
        @type str
        @return tuple of local expression (string) and special condition
        @rtype str
        """
        if cond.endswith(" ??created??"):
            cond, special = cond.split()
            special = self.watchSpecialCreated
        elif cond.endswith(" ??changed??"):
            cond, special = cond.split()
            special = self.watchSpecialChanged
        else:
            cond = cond
            special = ""
        
        return cond, special
    
    @pyqtSlot(str)
    def __clientClearWatchPoint(self, condition):
        """
        Private slot to handle the clientClearWatch signal.
        
        @param condition expression of watch expression to clear
        @type str
        """
        if self.debugging:
            cond, special = self.__splitWatchCondition(condition)
            index = self.watchpointModel.getWatchPointIndex(cond, special)
            self.watchpointModel.deleteWatchPointByIndex(index)
            if condition in self.__reportedWatchpointIssues:
                self.__reportedWatchpointIssues.remove(condition)
    
    def __deleteWatchPoints(self, parentIndex, start, end):
        """
        Private slot to delete watch expressions.
        
        @param parentIndex index of parent item
        @type QModelIndex
        @param start start row
        @type int
        @param end end row
        @type int
        """
        if self.debugging:
            for row in range(start, end + 1):
                index = self.watchpointModel.index(row, 0, parentIndex)
                cond, special = (
                    self.watchpointModel.getWatchPointByIndex(index)[0:2])
                cond = self.__makeWatchCondition(cond, special)
                self.__remoteWatchpoint("", cond, False)
                if cond in self.__reportedWatchpointIssues:
                    self.__reportedWatchpointIssues.remove(cond)
    
    def __watchPointDataAboutToBeChanged(self, startIndex, endIndex):
        """
        Private slot to handle the dataAboutToBeChanged signal of the
        watch expression model.
        
        @param startIndex start index of the rows to be changed
        @type QModelIndex
        @param endIndex end index of the rows to be changed
        @type QModelIndex
        """
        if self.debugging:
            self.__deleteWatchPoints(
                QModelIndex(), startIndex.row(), endIndex.row())
    
    def __addWatchPoints(self, parentIndex, start, end, debuggerId=""):
        """
        Private slot to set a watch expression.
        
        @param parentIndex index of parent item
        @type QModelIndex
        @param start start row
        @type int
        @param end end row
        @type int
        @param debuggerId ID of the debugger backend to send to. If this is
            empty, they will be broadcast to all connected backends.
        @type str
        """
        if self.debugging:
            for row in range(start, end + 1):
                index = self.watchpointModel.index(row, 0, parentIndex)
                cond, special, temp, enabled, ignorecount = (
                    self.watchpointModel.getWatchPointByIndex(index)[:5])
                cond = self.__makeWatchCondition(cond, special)
                
                if cond in self.__reportedWatchpointIssues:
                    self.__reportedWatchpointIssues.remove(cond)
                
                self.__remoteWatchpoint(debuggerId, cond, True, temp)
                if not enabled:
                    self.__remoteWatchpointEnable(debuggerId, cond, False)
                if ignorecount:
                    self.__remoteWatchpointIgnore(debuggerId, cond,
                                                  ignorecount)
    
    def __changeWatchPoints(self, startIndex, endIndex):
        """
        Private slot to set changed watch expressions.
        
        @param startIndex start index of the rows to be changed
        @type QModelIndex
        @param endIndex end index of the rows to be changed
        @type QModelIndex
        """
        if self.debugging:
            self.__addWatchPoints(
                QModelIndex(), startIndex.row(), endIndex.row())
    
    def getClientCapabilities(self, clientType):
        """
        Public method to retrieve the debug clients capabilities.
        
        @param clientType debug client type
        @type str
        @return debug client capabilities
        @rtype int
        """
        try:
            return self.__debuggerInterfaceRegistry[clientType][0]
        except KeyError:
            return 0    # no capabilities
    
    def getClientInterpreter(self):
        """
        Public method to get the interpreter of the debug client.
        
        @return interpreter of the debug client
        @rtype str
        """
        return self.clientInterpreter
    
    def getClientType(self):
        """
        Public method to get the currently running debug client type.
        
        @return debug client type
        @rtype str
        """
        return self.clientType
    
    def isClientProcessUp(self):
        """
        Public method to check, if the debug client process is up.
        
        @return flag indicating a running debug client process
        @rtype bool
        """
        return self.clientProcess is not None
    
    def __newConnection(self):
        """
        Private slot to handle a new connection.
        """
        sock = self.nextPendingConnection()
        peerAddress = sock.peerAddress().toString()
        if peerAddress not in Preferences.getDebugger("AllowedHosts"):
            # the peer is not allowed to connect
            res = E5MessageBox.yesNo(
                None,
                self.tr("Connection from illegal host"),
                self.tr(
                    """<p>A connection was attempted by the illegal host"""
                    """ <b>{0}</b>. Accept this connection?</p>""")
                .format(peerAddress),
                icon=E5MessageBox.Warning)
            if not res:
                sock.abort()
                return
            else:
                allowedHosts = Preferences.getDebugger("AllowedHosts")
                allowedHosts.append(peerAddress)
                Preferences.setDebugger("AllowedHosts", allowedHosts)
        
        if self.passive:
            self.__createDebuggerInterface(
                Preferences.getDebugger("PassiveDbgType"))
        
        self.debuggerInterface.newConnection(sock)
    
    def masterClientConnected(self):
        """
        Public method to perform actions after the master client has finally
        established the connection.
        """
        # Perform actions necessary, if client type has changed
        if self.lastClientType != self.clientType:
            self.lastClientType = self.clientType
            self.remoteBanner()
        elif self.__autoClearShell:
            self.__autoClearShell = False
            self.remoteBanner()
        elif self.passive:
            self.remoteBanner()
    
    def shutdownServer(self):
        """
        Public method to cleanly shut down.
        
        It closes our socket and shuts down
        the debug client. (Needed on Win OS)
        """
        if self.debuggerInterface is not None:
            self.debuggerInterface.shutdown()
    
    def remoteEnvironment(self, env):
        """
        Public method to set the environment for a program to debug, run, ...
        
        @param env environment settings
        @type str
        """
        envlist = shlex.split(env)
        envdict = {}
        for el in envlist:
            if '=' in el:
                key, value = el.split('=', 1)
                envdict[key] = value
            else:
                envdict[el] = ""
        self.debuggerInterface.remoteEnvironment(envdict)
    
    def remoteLoad(self, venvName, fn, argv, wd, env, autoClearShell=True,
                   tracePython=False, autoContinue=True, forProject=False,
                   runInConsole=False, clientType="", enableCallTrace=False,
                   enableMultiprocess=False, multiprocessNoDebug=""):
        """
        Public method to load a new program to debug.
        
        @param venvName name of the virtual environment to be used
        @type str
        @param fn the filename to debug
        @type str
        @param argv the command line arguments to pass to the program
        @type str
        @param wd the working directory for the program
        @type str
        @param env environment parameter settings
        @type str
        @param autoClearShell flag indicating, that the interpreter window
            should be cleared
        @type bool
        @param tracePython flag indicating if the Python library should be
            traced as well
        @type bool
        @param autoContinue flag indicating, that the debugger should not
            stop at the first executable line
        @type bool
        @param forProject flag indicating a project related action
        @type bool
        @param runInConsole flag indicating to start the debugger in a
            console window
        @type bool
        @param clientType client type to be used
        @type str
        @param enableCallTrace flag indicating to enable the call trace
            function
        @type bool
        @param enableMultiprocess flag indicating to perform multiprocess
            debugging
        @type bool
        @param multiprocessNoDebug space separated list of programs not to be
            debugged
        @type str
        """
        self.__autoClearShell = autoClearShell
        self.__multiprocessNoDebugList = [
            s.strip() for s in multiprocessNoDebug.split(os.pathsep)
        ]
        
        if clientType not in self.getSupportedLanguages():
            # a not supported client language was requested
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            return
        
        # Restart the client
        try:
            if clientType:
                self.__setClientType(clientType)
            else:
                self.__setClientType(
                    self.__findLanguageForExtension(os.path.splitext(fn)[1]))
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject,
                         runInConsole=runInConsole, venvName=venvName)
        
        self.setCallTraceEnabled("", enableCallTrace)
        self.remoteEnvironment(env)
        
        self.debuggerInterface.remoteLoad(
            fn, argv, wd, tracePython, autoContinue,
            enableMultiprocess=enableMultiprocess
        )
        self.debugging = True
        self.running = True
        self.__restoreBreakpoints()
        self.__restoreWatchpoints()
        self.__restoreNoDebugList()
    
    def remoteRun(self, venvName, fn, argv, wd, env, autoClearShell=True,
                  forProject=False, runInConsole=False, clientType=""):
        """
        Public method to load a new program to run.
        
        @param venvName name of the virtual environment to be used
        @type str
        @param fn the filename to debug
        @type str
        @param argv the command line arguments to pass to the program
        @type str
        @param wd the working directory for the program
        @type str
        @param env environment parameter settings
        @type str
        @param autoClearShell flag indicating, that the interpreter window
            should be cleared
        @type bool
        @param forProject flag indicating a project related action
        @type bool
        @param runInConsole flag indicating to start the debugger in a
            console window
        @type bool
        @param clientType client type to be used
        @type str
        """
        self.__autoClearShell = autoClearShell
        
        if clientType not in self.getSupportedLanguages():
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            # a not supported client language was requested
            return
        
        # Restart the client
        try:
            if clientType:
                self.__setClientType(clientType)
            else:
                self.__setClientType(
                    self.__findLanguageForExtension(os.path.splitext(fn)[1]))
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject,
                         runInConsole=runInConsole, venvName=venvName)
        
        self.remoteEnvironment(env)
        
        self.debuggerInterface.remoteRun(fn, argv, wd)
        self.debugging = False
        self.running = True
    
    def remoteCoverage(self, venvName, fn, argv, wd, env,
                       autoClearShell=True, erase=False, forProject=False,
                       runInConsole=False, clientType=""):
        """
        Public method to load a new program to collect coverage data.
        
        @param venvName name of the virtual environment to be used
        @type str
        @param fn the filename to debug
        @type str
        @param argv the command line arguments to pass to the program
        @type str
        @param wd the working directory for the program
        @type str
        @param env environment parameter settings
        @type str
        @param autoClearShell flag indicating, that the interpreter window
            should be cleared
        @type bool
        @param erase flag indicating that coverage info should be
            cleared first
        @type bool
        @param forProject flag indicating a project related action
        @type bool
        @param runInConsole flag indicating to start the debugger in a
            console window
        @type bool
        @param clientType client type to be used
        @type str
        """
        self.__autoClearShell = autoClearShell
        
        if clientType not in self.getSupportedLanguages():
            # a not supported client language was requested
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            return
        
        # Restart the client
        try:
            if clientType:
                self.__setClientType(clientType)
            else:
                self.__setClientType(
                    self.__findLanguageForExtension(os.path.splitext(fn)[1]))
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject,
                         runInConsole=runInConsole, venvName=venvName)
        
        self.remoteEnvironment(env)
        
        self.debuggerInterface.remoteCoverage(fn, argv, wd, erase)
        self.debugging = False
        self.running = True
    
    def remoteProfile(self, venvName, fn, argv, wd, env,
                      autoClearShell=True, erase=False, forProject=False,
                      runInConsole=False, clientType=""):
        """
        Public method to load a new program to collect profiling data.
        
        @param venvName name of the virtual environment to be used
        @type str
        @param fn the filename to debug
        @type str
        @param argv the command line arguments to pass to the program
        @type str
        @param wd the working directory for the program
        @type str
        @param env environment parameter settings
        @type str
        @param autoClearShell flag indicating, that the interpreter window
            should be cleared
        @type bool
        @param erase flag indicating that coverage info should be
            cleared first
        @type bool
        @param forProject flag indicating a project related action
        @type bool
        @param runInConsole flag indicating to start the debugger in a
            console window
        @type bool
        @param clientType client type to be used
        @type str
        """
        self.__autoClearShell = autoClearShell
        
        if clientType not in self.getSupportedLanguages():
            # a not supported client language was requested
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            return
        
        # Restart the client
        try:
            if clientType:
                self.__setClientType(clientType)
            else:
                self.__setClientType(
                    self.__findLanguageForExtension(os.path.splitext(fn)[1]))
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject,
                         runInConsole=runInConsole, venvName=venvName)
        
        self.remoteEnvironment(env)
        
        self.debuggerInterface.remoteProfile(fn, argv, wd, erase)
        self.debugging = False
        self.running = True
    
    def remoteStatement(self, debuggerId, stmt):
        """
        Public method to execute a Python statement.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param stmt the Python statement to execute.
        @type str
        """
        self.debuggerInterface.remoteStatement(debuggerId, stmt.rstrip())
    
    def remoteStep(self, debuggerId):
        """
        Public method to single step the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteStep(debuggerId)
    
    def remoteStepOver(self, debuggerId):
        """
        Public method to step over the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteStepOver(debuggerId)
    
    def remoteStepOut(self, debuggerId):
        """
        Public method to step out the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteStepOut(debuggerId)
    
    def remoteStepQuit(self, debuggerId):
        """
        Public method to stop the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteStepQuit(debuggerId)
    
    def remoteContinue(self, debuggerId, special=False):
        """
        Public method to continue the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param special flag indicating a special continue operation
        """
        self.debuggerInterface.remoteContinue(debuggerId, special)
    
    def remoteContinueUntil(self, debuggerId, line):
        """
        Public method to continue the debugged program to the given line
        or until returning from the current frame.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param line the new line, where execution should be continued to
        @type int
        """
        self.debuggerInterface.remoteContinueUntil(debuggerId, line)
    
    def remoteMoveIP(self, debuggerId, line):
        """
        Public method to move the instruction pointer to a different line.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param line the new line, where execution should be continued
        @type int
        """
        self.debuggerInterface.remoteMoveIP(debuggerId, line)
    
    def remoteBreakpoint(self, debuggerId, fn, line, setBreakpoint, cond=None,
                         temp=False):
        """
        Public method to set or clear a breakpoint.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param fn filename the breakpoint belongs to
        @type str
        @param line linenumber of the breakpoint
        @type int
        @param setBreakpoint flag indicating setting or resetting a breakpoint
        @type bool
        @param cond condition of the breakpoint
        @type str
        @param temp flag indicating a temporary breakpoint
        @type bool
        """
        self.debuggerInterface.remoteBreakpoint(
            debuggerId, fn, line, setBreakpoint, cond, temp)
    
    def __remoteBreakpointEnable(self, debuggerId, fn, line, enable):
        """
        Private method to enable or disable a breakpoint.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param fn filename the breakpoint belongs to
        @type str
        @param line linenumber of the breakpoint
        @type int
        @param enable flag indicating enabling or disabling a breakpoint
        @type bool
        """
        self.debuggerInterface.remoteBreakpointEnable(
            debuggerId, fn, line, enable)
    
    def __remoteBreakpointIgnore(self, debuggerId, fn, line, count):
        """
        Private method to ignore a breakpoint the next couple of occurrences.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param fn filename the breakpoint belongs to
        @type str
        @param line linenumber of the breakpoint
        @type int
        @param count number of occurrences to ignore
        @type int
        """
        self.debuggerInterface.remoteBreakpointIgnore(
            debuggerId, fn, line, count)
    
    def __remoteWatchpoint(self, debuggerId, cond, setWatch, temp=False):
        """
        Private method to set or clear a watch expression.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param cond expression of the watch expression
        @type str
        @param setWatch flag indicating setting or resetting a watch expression
        @type bool
        @param temp flag indicating a temporary watch expression
        @type bool
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.debuggerInterface.remoteWatchpoint(debuggerId, cond, setWatch,
                                                temp)
    
    def __remoteWatchpointEnable(self, debuggerId, cond, enable):
        """
        Private method to enable or disable a watch expression.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param cond expression of the watch expression
        @type str
        @param enable flag indicating enabling or disabling a watch expression
        @type bool
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.debuggerInterface.remoteWatchpointEnable(debuggerId, cond, enable)
    
    def __remoteWatchpointIgnore(self, debuggerId, cond, count):
        """
        Private method to ignore a watch expression the next couple of
        occurrences.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param cond expression of the watch expression
        @type str
        @param count number of occurrences to ignore
        @type int
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.debuggerInterface.remoteWatchpointIgnore(debuggerId, cond, count)
    
    def remoteRawInput(self, debuggerId, inputString):
        """
        Public method to send the raw input to the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param inputString the raw input
        @type str
        """
        self.debuggerInterface.remoteRawInput(debuggerId, inputString)
        self.clientRawInputSent.emit(debuggerId)
    
    def remoteThreadList(self, debuggerId):
        """
        Public method to request the list of threads from the client.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteThreadList(debuggerId)
    
    def remoteSetThread(self, debuggerId, tid):
        """
        Public method to request to set the given thread as current thread.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param tid id of the thread
        @type int
        """
        self.debuggerInterface.remoteSetThread(debuggerId, tid)
    
    def remoteClientStack(self, debuggerId):
        """
        Public method to request the stack of the main thread.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.debuggerInterface.remoteClientStack(debuggerId)
    
    def remoteClientVariables(self, debuggerId, scope, filterList, framenr=0):
        """
        Public method to request the variables of the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param scope the scope of the variables (0 = local, 1 = global)
        @type int
        @param filterList list of variable types to filter out
        @type list of str
        @param framenr framenumber of the variables to retrieve
        @type int
        """
        self.debuggerInterface.remoteClientVariables(
            debuggerId, scope, filterList, framenr, self.__maxVariableSize)
    
    def remoteClientVariable(self, debuggerId, scope, filterList, var,
                             framenr=0, maxSize=0):
        """
        Public method to request the variables of the debugged program.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param scope the scope of the variables (0 = local, 1 = global)
        @type int
        @param filterList list of variable types to filter out
        @type list of str
        @param var list encoded name of variable to retrieve
        @type list of str
        @param framenr framenumber of the variables to retrieve
        @type int
        @param maxSize maximum size the formatted value of a variable will
            be shown. If it is bigger than that, a 'too big' indication will
            be given (@@TOO_BIG_TO_SHOW@@).
        @type int
        """
        self.debuggerInterface.remoteClientVariable(
            debuggerId, scope, filterList, var, framenr,
            self.__maxVariableSize)
    
    def remoteClientDisassembly(self, debuggerId):
        """
        Public method to ask the client for the latest traceback disassembly.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        try:
            self.debuggerInterface.remoteClientDisassembly(debuggerId)
        except AttributeError:
            # remote client doesn't support that
            pass
    
    def remoteClientSetFilter(self, debuggerId, scope, filterStr):
        """
        Public method to set a variables filter list.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param scope the scope of the variables (0 = local, 1 = global)
        @type int
        @param filterStr regexp string for variable names to filter out
        @type str
        """
        self.debuggerInterface.remoteClientSetFilter(
            debuggerId, scope, filterStr)
    
    def setCallTraceEnabled(self, debuggerId, on):
        """
        Public method to set the call trace state.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param on flag indicating to enable the call trace function
        @type bool
        """
        self.debuggerInterface.setCallTraceEnabled(debuggerId, on)
    
    def remoteBanner(self):
        """
        Public slot to get the banner info of the remote client.
        """
        self.debuggerInterface.remoteBanner()
    
    def remoteCapabilities(self):
        """
        Public slot to get the debug clients capabilities.
        """
        self.debuggerInterface.remoteCapabilities()
    
    def remoteCompletion(self, debuggerId, text):
        """
        Public slot to get the a list of possible commandline completions
        from the remote client.
        
        @param debuggerId ID of the debugger backend
        @type str
        @param text the text to be completed
        @type str
        """
        self.debuggerInterface.remoteCompletion(debuggerId, text)
    
    def remoteUTDiscover(self, clientType, forProject, venvName, syspath,
                         workdir, discoveryStart):
        """
        Public method to perform a test case discovery.
        
        @param clientType client type to be used
        @type str
        @param forProject flag indicating a project related action
        @type bool
        @param venvName name of a virtual environment
        @type str
        @param syspath list of directories to be added to sys.path on the
            remote side
        @type list of str
        @param workdir path name of the working directory
        @type str
        @param discoveryStart directory to start auto-discovery at
        @type str
        """
        if clientType and clientType not in self.getSupportedLanguages():
            # a not supported client language was requested
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            return
        
        # Restart the client if there is already a program loaded.
        try:
            if clientType:
                self.__setClientType(clientType)
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject, venvName=venvName)
        
        self.debuggerInterface.remoteUTDiscover(
            syspath, workdir, discoveryStart)
    
    def remoteUTPrepare(self, fn, tn, tfn, failed, cov, covname, coverase,
                        clientType="", forProject=False, venvName="",
                        syspath=None, workdir="", discover=False,
                        discoveryStart="", testCases=None, debug=False):
        """
        Public method to prepare a new unittest run.
        
        @param fn the filename to load
        @type str
        @param tn the testname to load
        @type str
        @param tfn the test function name to load tests from
        @type str
        @param failed list of failed test, if only failed test should be run
        @type list of str
        @param cov flag indicating collection of coverage data is requested
        @type bool
        @param covname filename to be used to assemble the coverage caches
            filename
        @type str
        @param coverase flag indicating erasure of coverage data is requested
        @type bool
        @param clientType client type to be used
        @type str
        @param forProject flag indicating a project related action
        @type bool
        @param venvName name of a virtual environment
        @type str
        @param syspath list of directories to be added to sys.path on the
            remote side
        @type list of str
        @param workdir path name of the working directory
        @type str
        @param discover flag indicating to discover the tests automatically
        @type bool
        @param discoveryStart directory to start auto-discovery at
        @type str
        @param testCases list of test cases to be loaded
        @type list of str
        @param debug flag indicating to run unittest with debugging
        @type bool
        """
        if clientType and clientType not in self.getSupportedLanguages():
            # a not supported client language was requested
            E5MessageBox.critical(
                None,
                self.tr("Start Debugger"),
                self.tr(
                    """<p>The debugger type <b>{0}</b> is not supported"""
                    """ or not configured.</p>""").format(clientType)
            )
            return
        
        # Restart the client if there is already a program loaded.
        try:
            if clientType:
                self.__setClientType(clientType)
            else:
                self.__setClientType(
                    self.__findLanguageForExtension(os.path.splitext(fn)[1]))
        except KeyError:
            self.__setClientType('Python3')    # assume it is a Python3 file
        self.startClient(False, forProject=forProject, venvName=venvName)
        
        self.debuggerInterface.remoteUTPrepare(
            fn, tn, tfn, failed, cov, covname, coverase, syspath, workdir,
            discover, discoveryStart, testCases, debug)
        self.running = True
        self.debugging = debug
        if debug:
            self.__restoreBreakpoints()
            self.__restoreWatchpoints()
    
    def remoteUTRun(self, debug=False, failfast=False):
        """
        Public method to start a unittest run.
        
        @param debug flag indicating to run unittest with debugging
        @type bool
        @param failfast flag indicating to stop at the first error
        @type bool
        """
        self.debuggerInterface.remoteUTRun(debug, failfast)
    
    def remoteUTStop(self):
        """
        public method to stop a unittest run.
        """
        self.debuggerInterface.remoteUTStop()
    
    def signalClientOutput(self, line, debuggerId):
        """
        Public method to process a line of client output.
        
        @param line client output
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        if debuggerId:
            self.clientOutput.emit("{0}: {1}".format(debuggerId, line))
        else:
            self.clientOutput.emit(line)
    
    def signalClientLine(self, filename, lineno, debuggerId, forStack=False,
                         threadName=""):
        """
        Public method to process client position feedback.
        
        @param filename name of the file currently being executed
        @type str
        @param lineno line of code currently being executed
        @type int
        @param debuggerId ID of the debugger backend
        @type str
        @param forStack flag indicating this is for a stack dump
        @type bool
        @param threadName name of the thread signaling the event
        @type str
        """
        self.clientLine.emit(filename, lineno, debuggerId, threadName,
                             forStack)
    
    def signalClientStack(self, stack, debuggerId, threadName=""):
        """
        Public method to process a client's stack information.
        
        @param stack list of stack entries. Each entry is a tuple of three
            values giving the filename, linenumber and method
        @type list of lists of (string, integer, string)
        @param debuggerId ID of the debugger backend
        @type str
        @param threadName name of the thread signaling the event
        @type str
        """
        self.clientStack.emit(stack, debuggerId, threadName)
    
    def signalClientThreadList(self, currentId, threadList, debuggerId):
        """
        Public method to process the client thread list info.
        
        @param currentId id of the current thread
        @type int
        @param threadList list of dictionaries containing the thread data
        @type list of dict
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientThreadList.emit(currentId, threadList, debuggerId)
    
    def signalClientThreadSet(self, debuggerId):
        """
        Public method to handle the change of the client thread.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientThreadSet.emit(debuggerId)
    
    def signalClientVariables(self, scope, variables, debuggerId):
        """
        Public method to process the client variables info.
        
        @param scope scope of the variables (-1 = empty global, 1 = global,
            0 = local)
        @type int
        @param variables the list of variables from the client
        @type list
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientVariables.emit(scope, variables, debuggerId)
    
    def signalClientVariable(self, scope, variables, debuggerId):
        """
        Public method to process the client variable info.
        
        @param scope scope of the variables (-1 = empty global, 1 = global,
            0 = local)
        @type int
        @param variables the list of members of a classvariable from the client
        @type list
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientVariable.emit(scope, variables, debuggerId)
    
    def signalClientStatement(self, more, debuggerId):
        """
        Public method to process the input response from the client.
        
        @param more flag indicating that more user input is required
        @type bool
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientStatement.emit(more, debuggerId)
    
    def signalClientDisassembly(self, disassembly, debuggerId):
        """
        Public method to process the disassembly info from the client.
        
        @param disassembly dictionary containing the disassembly information
        @type dict
        @param debuggerId ID of the debugger backend
        @type str
        """
        if self.running:
            self.clientDisassembly.emit(disassembly, debuggerId)
    
    def signalClientException(self, exceptionType, exceptionMessage,
                              stackTrace, debuggerId, threadName=""):
        """
        Public method to process the exception info from the client.
        
        @param exceptionType type of exception raised
        @type str
        @param exceptionMessage message given by the exception
        @type str
        @param stackTrace list of stack entries with the exception position
            first. Each stack entry is a list giving the filename and the
            linenumber.
        @type list
        @param debuggerId ID of the debugger backend
        @type str
        @param threadName name of the thread signaling the event
        @type str
        """
        if self.running:
            self.clientException.emit(exceptionType, exceptionMessage,
                                      stackTrace, debuggerId, threadName)
    
    def signalClientSyntaxError(self, message, filename, lineNo, characterNo,
                                debuggerId, threadName=""):
        """
        Public method to process a syntax error info from the client.
        
        @param message message of the syntax error
        @type str
        @param filename translated filename of the syntax error position
        @type str
        @param lineNo line number of the syntax error position
        @type int
        @param characterNo character number of the syntax error position
        @type int
        @param debuggerId ID of the debugger backend
        @type str
        @param threadName name of the thread signaling the event
        @type str
        """
        if self.running:
            self.clientSyntaxError.emit(message, filename, lineNo, characterNo,
                                        debuggerId, threadName)
    
    def signalClientSignal(self, message, filename, lineNo,
                           funcName, funcArgs, debuggerId):
        """
        Public method to process a signal generated on the client side.
        
        @param message message of the syntax error
        @type str
        @param filename translated filename of the syntax error position
        @type str
        @param lineNo line number of the syntax error position
        @type int
        @param funcName name of the function causing the signal
        @type str
        @param funcArgs function arguments
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        if self.running:
            self.clientSignal.emit(message, filename, lineNo,
                                   funcName, funcArgs, debuggerId)
    
    def signalClientDisconnected(self, debuggerId):
        """
        Public method to send a signal when a debug client has closed its
        connection.
        
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientDisconnected.emit(debuggerId)
    
    def signalClientExit(self, program, status, message, debuggerId):
        """
        Public method to process the client exit status.
        
        @param program name of the exited program
        @type str
        @param status exit code
        @type int
        @param message message sent with the exit
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientExit.emit(program, int(status), message, False, debuggerId)
    
    def signalLastClientExited(self):
        """
        Public method to process the last client exit event.
        """
        if self.passive:
            self.__passiveShutDown()
        self.lastClientExited.emit()
        if Preferences.getDebugger("AutomaticReset") or (self.running and
                                                         not self.debugging):
            self.debugging = False
            self.startClient(False, forProject=self.__forProject)
        if self.passive:
            self.__createDebuggerInterface("None")
            self.signalClientOutput(self.tr('\nNot connected\n'))
            self.signalClientStatement(False, "")
        self.running = False
    
    def signalClientClearBreak(self, filename, lineno, debuggerId):
        """
        Public method to process the client clear breakpoint command.
        
        @param filename filename of the breakpoint
        @type str
        @param lineno line umber of the breakpoint
        @type int
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientClearBreak.emit(filename, lineno, debuggerId)
    
    def signalClientBreakConditionError(self, filename, lineno, debuggerId):
        """
        Public method to process the client breakpoint condition error info.
        
        @param filename filename of the breakpoint
        @type str
        @param lineno line umber of the breakpoint
        @type int
        @param debuggerId ID of the debugger backend
        @type str
        """
        if (filename, lineno) not in self.__reportedBreakpointIssues:
            self.__reportedBreakpointIssues.append((filename, lineno))
            self.clientBreakConditionError.emit(filename, lineno, debuggerId)
    
    def signalClientClearWatch(self, condition, debuggerId):
        """
        Public slot to handle the clientClearWatch signal.
        
        @param condition expression of watch expression to clear
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientClearWatch.emit(condition, debuggerId)
    
    def signalClientWatchConditionError(self, condition, debuggerId):
        """
        Public method to process the client watch expression error info.
        
        @param condition expression of watch expression to clear
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        if condition not in self.__reportedWatchpointIssues:
            self.__reportedWatchpointIssues.append(condition)
            self.clientWatchConditionError.emit(condition, debuggerId)
    
    def signalClientRawInput(self, prompt, echo, debuggerId):
        """
        Public method to process the client raw input command.
        
        @param prompt the input prompt
        @type str
        @param echo flag indicating an echoing of the input
        @type bool
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientRawInput.emit(prompt, echo, debuggerId)
    
    def signalClientBanner(self, version, platform, venvName):
        """
        Public method to process the client banner info.
        
        @param version interpreter version info
        @type str
        @param platform hostname of the client
        @type str
        @param venvName name of the virtual environment
        @type str
        """
        self.clientBanner.emit(version, platform, venvName)
    
    def signalClientCapabilities(self, capabilities, clientType, venvName):
        """
        Public method to process the client capabilities info.
        
        @param capabilities bitmaks with the client capabilities
        @type int
        @param clientType type of the debug client
        @type str
        @param venvName name of the virtual environment
        @type str
        """
        try:
            self.__debuggerInterfaceRegistry[clientType][0] = capabilities
            self.clientCapabilities.emit(capabilities, clientType, venvName)
        except KeyError:
            # ignore silently
            pass
    
    def signalClientCompletionList(self, completionList, text, debuggerId):
        """
        Public method to process the client auto completion info.
        
        @param completionList list of possible completions
        @type list of str
        @param text the text to be completed
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.clientCompletionList.emit(completionList, text)
    
    def signalClientCallTrace(self, isCall, fromFile, fromLine, fromFunction,
                              toFile, toLine, toFunction, debuggerId):
        """
        Public method to process the client call trace data.
        
        @param isCall flag indicating a 'call'
        @type bool
        @param fromFile name of the originating file
        @type str
        @param fromLine line number in the originating file
        @type str
        @param fromFunction name of the originating function
        @type str
        @param toFile name of the target file
        @type str
        @param toLine line number in the target file
        @type str
        @param toFunction name of the target function
        @type str
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.callTraceInfo.emit(
            isCall, fromFile, fromLine, fromFunction,
            toFile, toLine, toFunction, debuggerId)
    
    def clientUtDiscovered(self, testCases, exceptionType, exceptionValue):
        """
        Public method to process the client unittest discover info.
        
        @param testCases list of detected test cases
        @type str
        @param exceptionType exception type
        @type str
        @param exceptionValue exception message
        @type str
        """
        self.utDiscovered.emit(testCases, exceptionType, exceptionValue)
    
    def clientUtPrepared(self, result, exceptionType, exceptionValue):
        """
        Public method to process the client unittest prepared info.
        
        @param result number of test cases (0 = error)
        @type int
        @param exceptionType exception type
        @type str
        @param exceptionValue exception message
        @type str
        """
        self.utPrepared.emit(result, exceptionType, exceptionValue)
    
    def clientUtStartTest(self, testname, doc):
        """
        Public method to process the client start test info.
        
        @param testname name of the test
        @type str
        @param doc short description of the test
        @type str
        """
        self.utStartTest.emit(testname, doc)
    
    def clientUtStopTest(self):
        """
        Public method to process the client stop test info.
        """
        self.utStopTest.emit()
    
    def clientUtTestFailed(self, testname, traceback, testId):
        """
        Public method to process the client test failed info.
        
        @param testname name of the test
        @type str
        @param traceback lines of traceback info
        @type list of str
        @param testId id of the test
        @type str
        """
        self.utTestFailed.emit(testname, traceback, testId)
    
    def clientUtTestErrored(self, testname, traceback, testId):
        """
        Public method to process the client test errored info.
        
        @param testname name of the test
        @type str
        @param traceback lines of traceback info
        @type list of str
        @param testId id of the test
        @type str
        """
        self.utTestErrored.emit(testname, traceback, testId)
    
    def clientUtTestSkipped(self, testname, reason, testId):
        """
        Public method to process the client test skipped info.
        
        @param testname name of the test
        @type str
        @param reason reason for skipping the test
        @type str
        @param testId id of the test
        @type str
        """
        self.utTestSkipped.emit(testname, reason, testId)
    
    def clientUtTestFailedExpected(self, testname, traceback, testId):
        """
        Public method to process the client test failed expected info.
        
        @param testname name of the test
        @type str
        @param traceback lines of traceback info
        @type list of str
        @param testId id of the test
        @type str
        """
        self.utTestFailedExpected.emit(testname, traceback, testId)
    
    def clientUtTestSucceededUnexpected(self, testname, testId):
        """
        Public method to process the client test succeeded unexpected info.
        
        @param testname name of the test
        @type str
        @param testId id of the test
        @type str
        """
        self.utTestSucceededUnexpected.emit(testname, testId)
    
    def clientUtFinished(self, status):
        """
        Public method to process the client unit test finished info.
        
        @param status exit status of the unit test
        @type int
        """
        self.utFinished.emit()
        
        self.clientExit.emit("", int(status), "", True, "")
        self.debugging = False
        self.running = False
    
    def passiveStartUp(self, fn, exc, debuggerId):
        """
        Public method to handle a passive debug connection.
        
        @param fn filename of the debugged script
        @type str
        @param exc flag to enable exception reporting of the IDE
        @type bool
        @param debuggerId ID of the debugger backend
        @type str
        """
        self.appendStdout.emit(self.tr("Passive debug connection received\n"))
        self.passiveClientExited = False
        self.debugging = True
        self.running = True
        self.__restoreBreakpoints(debuggerId)
        self.__restoreWatchpoints(debuggerId)
        self.passiveDebugStarted.emit(fn, exc)
    
    def __passiveShutDown(self):
        """
        Private method to shut down a passive debug connection.
        """
        self.passiveClientExited = True
        self.shutdownServer()
        self.appendStdout.emit(self.tr("Passive debug connection closed\n"))
    
    def __restoreBreakpoints(self, debuggerId=""):
        """
        Private method to restore the breakpoints after a restart.
        
        @param debuggerId ID of the debugger backend to send to. If this is
            empty, they will be broadcast to all connected backends.
        @type str
        """
        if self.debugging:
            self.__addBreakPoints(
                QModelIndex(), 0, self.breakpointModel.rowCount() - 1,
                debuggerId)
    
    def __restoreWatchpoints(self, debuggerId=""):
        """
        Private method to restore the watch expressions after a restart.
        
        @param debuggerId ID of the debugger backend to send to. If this is
            empty, they will be broadcast to all connected backends.
        @type str
        """
        if self.debugging:
            self.__addWatchPoints(
                QModelIndex(), 0, self.watchpointModel.rowCount() - 1,
                debuggerId)
    
    def getBreakPointModel(self):
        """
        Public slot to get a reference to the breakpoint model object.
        
        @return reference to the breakpoint model object
        @rtype BreakPointModel
        """
        return self.breakpointModel
    
    def getWatchPointModel(self):
        """
        Public slot to get a reference to the watch expression model object.
        
        @return reference to the watch expression model object
        @rtype WatchPointModel
        """
        return self.watchpointModel
    
    def isConnected(self):
        """
        Public method to test, if the debug server is connected to a backend.
        
        @return flag indicating a connection
        @rtype bool
        """
        return self.debuggerInterface and self.debuggerInterface.isConnected()
    
    def isDebugging(self):
        """
        Public method to test, if the debug server is debugging.
        
        @return flag indicating the debugging state
        @rtype bool
        """
        return self.debugging
    
    def setDebugging(self, on):
        """
        Public method to set the debugging state.
        
        @param on flag indicating the new debugging state
        @type bool
        """
        self.debugging = on
    
    def signalClientDebuggerId(self, debuggerId):
        """
        Public method to signal the receipt of a new debugger ID.
        
        This signal indicates, that a new debugger backend has connected.
        
        @param debuggerId ID of the newly connected debugger backend
        @type str
        """
        self.clientDebuggerId.emit(debuggerId)
    
    def getDebuggerIds(self):
        """
        Public method to return the IDs of the connected debugger backends.
        
        @return list of connected debugger backend IDs
        @rtype list of str
        """
        if self.debuggerInterface:
            return self.debuggerInterface.getDebuggerIds()
        else:
            return []
    
    def initializeClient(self, debuggerId):
        """
        Public method to initialize a freshly connected debug client.
        
        @param debuggerId ID of the connected debugger
        @type str
        """
        self.__restoreBreakpoints(debuggerId)
        self.__restoreWatchpoints(debuggerId)
        self.__restoreNoDebugList(debuggerId)
    
    def __restoreNoDebugList(self, debuggerId=""):
        """
        Private method to restore the list of scripts not to be debugged after
        a restart.
        
        @param debuggerId ID of the debugger backend to send to. If this is
            empty, they will be broadcast to all connected backends.
        @type str
        """
        if self.debugging:
            self.debuggerInterface.remoteNoDebugList(
                debuggerId, self.__multiprocessNoDebugList)