Debugger/DebuggerInterfacePython3.py

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

# Copyright (c) 2009 - 2011 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Python3 debugger interface for the debug server.
"""

import sys
import os

from PyQt4.QtCore import QObject, QTextCodec, QProcess, QTimer
from PyQt4.QtGui import QInputDialog

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from . import DebugProtocol
from . import DebugClientCapabilities

import Preferences
import Utilities

from eric5config import getConfig


ClientDefaultCapabilities = DebugClientCapabilities.HasAll
    

def getRegistryData():
    """
    Module function to get characterising data for the debugger interface.
    
    @return list of the following data. Client type (string), client
        capabilities (integer), client type association (list of strings)
    """
    exts = []
    for ext in Preferences.getDebugger("Python3Extensions").split():
        if ext.startswith("."):
            exts.append(ext)
        else:
            exts.append(".{0}".format(ext))
    
    if exts:
        return ["Python3", ClientDefaultCapabilities, exts]
    else:
        return ["", 0, []]


class DebuggerInterfacePython3(QObject):
    """
    Class implementing the Python debugger interface for the debug server.
    """
    def __init__(self, debugServer, passive):
        """
        Constructor
        
        @param debugServer reference to the debug server (DebugServer)
        @param passive flag indicating passive connection mode (boolean)
        """
        super().__init__()
        
        self.__isNetworked = True
        self.__autoContinue = not passive
        
        self.debugServer = debugServer
        self.passive = passive
        self.process = None
        
        self.qsock = None
        self.queue = []
        # set default values for capabilities of clients
        self.clientCapabilities = ClientDefaultCapabilities
        
        self.codec = QTextCodec.codecForName(str(Preferences.getSystem("StringEncoding")))
        
        if passive:
            # set translation function
            if Preferences.getDebugger("PathTranslation"):
                self.translateRemote = \
                    Preferences.getDebugger("PathTranslationRemote")
                self.translateLocal = \
                    Preferences.getDebugger("PathTranslationLocal")
                self.translate = self.__remoteTranslation
            else:
                self.translate = self.__identityTranslation

    def __identityTranslation(self, fn, remote2local=True):
        """
        Private method to perform the identity path translation.
        
        @param fn filename to be translated (string)
        @param remote2local flag indicating the direction of translation
            (False = local to remote, True = remote to local [default])
        @return translated filename (string)
        """
        return fn
        
    def __remoteTranslation(self, fn, remote2local=True):
        """
        Private method to perform the path translation.
        
        @param fn filename to be translated (string)
        @param remote2local flag indicating the direction of translation
            (False = local to remote, True = remote to local [default])
        @return translated filename (string)
        """
        if remote2local:
            return fn.replace(self.translateRemote, self.translateLocal)
        else:
            return fn.replace(self.translateLocal, self.translateRemote)
        
    def __startProcess(self, program, arguments, environment=None):
        """
        Private method to start the debugger client process.
        
        @param program name of the executable to start (string)
        @param arguments arguments to be passed to the program (list of string)
        @param environment dictionary of environment settings to pass (dict of string)
        @return the process object (QProcess) or None
        """
        proc = QProcess()
        if environment is not None:
            env = []
            for key, value in list(environment.items()):
                env.append("{0}={1}".format(key, value))
            proc.setEnvironment(env)
        args = []
        for arg in arguments:
            args.append(arg)
        proc.start(program, args)
        if not proc.waitForStarted(10000):
            proc = None
        
        return proc
        
    def startRemote(self, port, runInConsole):
        """
        Public method to start a remote Python interpreter.
        
        @param port portnumber the debug server is listening on (integer)
        @param runInConsole flag indicating to start the debugger in a
            console window (boolean)
        @return client process object (QProcess) and a flag to indicate
            a network connection (boolean)
        """
        if Preferences.getDebugger("CustomPython3Interpreter"):
            interpreter = Preferences.getDebugger("Python3Interpreter")
            if interpreter == "":
                interpreter = sys.executable
        else:
            interpreter = sys.executable
        
        debugClientType = Preferences.getDebugger("DebugClientType3")
        if debugClientType == "standard":
            debugClient = os.path.join(getConfig('ericDir'),
                                       "DebugClients", "Python3", "DebugClient.py")
        elif debugClientType == "threaded":
            debugClient = os.path.join(getConfig('ericDir'),
                                       "DebugClients", "Python3", "DebugClientThreads.py")
        else:
            debugClient = Preferences.getDebugger("DebugClient3")
            if debugClient == "":
                debugClient = os.path.join(sys.path[0],
                                           "DebugClients", "Python3", "DebugClient.py")
        
        redirect = str(Preferences.getDebugger("Python3Redirect"))
        noencoding = \
            Preferences.getDebugger("Python3NoEncoding") and '--no-encoding' or ''
        
        if Preferences.getDebugger("RemoteDbgEnabled"):
            ipaddr = self.debugServer.getHostAddress(False)
            rexec = Preferences.getDebugger("RemoteExecution")
            rhost = Preferences.getDebugger("RemoteHost")
            if rhost == "":
                rhost = "localhost"
            if rexec:
                args = Utilities.parseOptionString(rexec) + \
                       [rhost, interpreter, os.path.abspath(debugClient),
                        noencoding, str(port), redirect, ipaddr]
                args[0] = Utilities.getExecutablePath(args[0])
                process = self.__startProcess(args[0], args[1:])
                if process is None:
                    E5MessageBox.critical(None,
                        self.trUtf8("Start Debugger"),
                        self.trUtf8(
                            """<p>The debugger backend could not be started.</p>"""))
                
                # set translation function
                if Preferences.getDebugger("PathTranslation"):
                    self.translateRemote = \
                        Preferences.getDebugger("PathTranslationRemote")
                    self.translateLocal = \
                        Preferences.getDebugger("PathTranslationLocal")
                    self.translate = self.__remoteTranslation
                else:
                    self.translate = self.__identityTranslation
                return process, self.__isNetworked
        
        # set translation function
        self.translate = self.__identityTranslation
        
        # setup the environment for the debugger
        if Preferences.getDebugger("DebugEnvironmentReplace"):
            clientEnv = {}
        else:
            clientEnv = os.environ.copy()
        envlist = Utilities.parseEnvironmentString(
            Preferences.getDebugger("DebugEnvironment"))
        for el in envlist:
            try:
                key, value = el.split('=', 1)
                if value.startswith('"') or value.startswith("'"):
                    value = value[1:-1]
                clientEnv[str(key)] = str(value)
            except ValueError:
                pass
        
        ipaddr = self.debugServer.getHostAddress(True)
        if runInConsole or Preferences.getDebugger("ConsoleDbgEnabled"):
            ccmd = Preferences.getDebugger("ConsoleDbgCommand")
            if ccmd:
                args = Utilities.parseOptionString(ccmd) + \
                       [interpreter, os.path.abspath(debugClient),
                        noencoding, str(port), '0', ipaddr]
                args[0] = Utilities.getExecutablePath(args[0])
                process = self.__startProcess(args[0], args[1:], clientEnv)
                if process is None:
                    E5MessageBox.critical(None,
                        self.trUtf8("Start Debugger"),
                        self.trUtf8(
                            """<p>The debugger backend could not be started.</p>"""))
                return process, self.__isNetworked
        
        process = self.__startProcess(interpreter,
            [debugClient, noencoding, str(port), redirect, ipaddr],
            clientEnv)
        if process is None:
            E5MessageBox.critical(None,
                self.trUtf8("Start Debugger"),
                self.trUtf8("""<p>The debugger backend could not be started.</p>"""))
        return process, self.__isNetworked

    def startRemoteForProject(self, port, runInConsole):
        """
        Public method to start a remote Python interpreter for a project.
        
        @param port portnumber the debug server is listening on (integer)
        @param runInConsole flag indicating to start the debugger in a
            console window (boolean)
        @return client process object (QProcess) and a flag to indicate
            a network connection (boolean)
        """
        project = e5App().getObject("Project")
        if not project.isDebugPropertiesLoaded():
            return None, self.__isNetworked
        
        # start debugger with project specific settings
        interpreter = project.getDebugProperty("INTERPRETER")
        debugClient = project.getDebugProperty("DEBUGCLIENT")
        
        redirect = str(project.getDebugProperty("REDIRECT"))
        noencoding = \
            project.getDebugProperty("NOENCODING") and '--no-encoding' or ''
        
        if project.getDebugProperty("REMOTEDEBUGGER"):
            ipaddr = self.debugServer.getHostAddress(False)
            rexec = project.getDebugProperty("REMOTECOMMAND")
            rhost = project.getDebugProperty("REMOTEHOST")
            if rhost == "":
                rhost = "localhost"
            if rexec:
                args = Utilities.parseOptionString(rexec) + \
                       [rhost, interpreter, os.path.abspath(debugClient),
                        noencoding, str(port), redirect, ipaddr]
                args[0] = Utilities.getExecutablePath(args[0])
                process = self.__startProcess(args[0], args[1:])
                if process is None:
                    E5MessageBox.critical(None,
                        self.trUtf8("Start Debugger"),
                        self.trUtf8(
                            """<p>The debugger backend could not be started.</p>"""))
                # set translation function
                if project.getDebugProperty("PATHTRANSLATION"):
                    self.translateRemote = project.getDebugProperty("REMOTEPATH")
                    self.translateLocal = project.getDebugProperty("LOCALPATH")
                    self.translate = self.__remoteTranslation
                else:
                    self.translate = self.__identityTranslation
                return process, self.__isNetworked
        
        # set translation function
        self.translate = self.__identityTranslation
        
        # setup the environment for the debugger
        if project.getDebugProperty("ENVIRONMENTOVERRIDE"):
            clientEnv = {}
        else:
            clientEnv = os.environ.copy()
        envlist = Utilities.parseEnvironmentString(
            project.getDebugProperty("ENVIRONMENTSTRING"))
        for el in envlist:
            try:
                key, value = el.split('=', 1)
                if value.startswith('"') or value.startswith("'"):
                    value = value[1:-1]
                clientEnv[str(key)] = str(value)
            except ValueError:
                pass
        
        ipaddr = self.debugServer.getHostAddress(True)
        if runInConsole or project.getDebugProperty("CONSOLEDEBUGGER"):
            ccmd = project.getDebugProperty("CONSOLECOMMAND") or \
                   Preferences.getDebugger("ConsoleDbgCommand")
            if ccmd:
                args = Utilities.parseOptionString(ccmd) + \
                       [interpreter, os.path.abspath(debugClient),
                        noencoding, str(port), '0', ipaddr]
                args[0] = Utilities.getExecutablePath(args[0])
                process = self.__startProcess(args[0], args[1:], clientEnv)
                if process is None:
                    E5MessageBox.critical(None,
                        self.trUtf8("Start Debugger"),
                        self.trUtf8(
                            """<p>The debugger backend could not be started.</p>"""))
                return process, self.__isNetworked
        
        process = self.__startProcess(interpreter,
            [debugClient, noencoding, str(port), redirect, ipaddr],
            clientEnv)
        if process is None:
            E5MessageBox.critical(None,
                self.trUtf8("Start Debugger"),
                self.trUtf8("""<p>The debugger backend could not be started.</p>"""))
        return process, self.__isNetworked

    def getClientCapabilities(self):
        """
        Public method to retrieve the debug clients capabilities.
        
        @return debug client capabilities (integer)
        """
        return self.clientCapabilities
    
    def newConnection(self, sock):
        """
        Public slot to handle a new connection.
        
        @param sock reference to the socket object (QTcpSocket)
        @return flag indicating success (boolean)
        """
        # If we already have a connection, refuse this one.  It will be closed
        # automatically.
        if self.qsock is not None:
            return False
        
        sock.disconnected[()].connect(self.debugServer.startClient)
        sock.readyRead[()].connect(self.__parseClientLine)
        
        self.qsock = sock
        
        # Get the remote clients capabilities
        self.remoteCapabilities()
        return True
    
    def flush(self):
        """
        Public slot to flush the queue.
        """
        # Send commands that were waiting for the connection.
        for cmd in self.queue:
            self.qsock.write(cmd.encode('utf8', 'backslashreplace'))
        
        self.queue = []
    
    def shutdown(self):
        """
        Public method to cleanly shut down.
        
        It closes our socket and shuts down
        the debug client. (Needed on Win OS)
        """
        if self.qsock is None:
            return
        
        # do not want any slots called during shutdown
        self.qsock.disconnected.disconnect(self.debugServer.startClient)
        self.qsock.readyRead[()].disconnect(self.__parseClientLine)
        
        # close down socket, and shut down client as well.
        self.__sendCommand('{0}\n'.format(DebugProtocol.RequestShutdown))
        self.qsock.flush()
        
        self.qsock.close()
        
        # reinitialize
        self.qsock = None
        self.queue = []
    
    def isConnected(self):
        """
        Public method to test, if a debug client has connected.
        
        @return flag indicating the connection status (boolean)
        """
        return self.qsock is not None
    
    def remoteEnvironment(self, env):
        """
        Public method to set the environment for a program to debug, run, ...
        
        @param env environment settings (dictionary)
        """
        self.__sendCommand('{0}{1}\n'.format(DebugProtocol.RequestEnv, str(env)))
    
    def remoteLoad(self, fn, argv, wd, traceInterpreter=False, autoContinue=True,
                   autoFork=False, forkChild=False):
        """
        Public method to load a new program to debug.
        
        @param fn the filename to debug (string)
        @param argv the commandline arguments to pass to the program (string)
        @param wd the working directory for the program (string)
        @keyparam traceInterpreter flag indicating if the interpreter library should be
            traced as well (boolean)
        @keyparam autoContinue flag indicating, that the debugger should not stop
            at the first executable line (boolean)
        @keyparam autoFork flag indicating the automatic fork mode (boolean)
        @keyparam forkChild flag indicating to debug the child after forking (boolean)
        """
        self.__autoContinue = autoContinue
        
        wd = self.translate(wd, False)
        fn = self.translate(os.path.abspath(fn), False)
        self.__sendCommand('{0}{1}\n'.format(
            DebugProtocol.RequestForkMode, repr((autoFork, forkChild))))
        self.__sendCommand('{0}{1}|{2}|{3}|{4:d}\n'.format(
            DebugProtocol.RequestLoad, wd, fn, str(Utilities.parseOptionString(argv)),
             traceInterpreter))
    
    def remoteRun(self, fn, argv, wd, autoFork=False, forkChild=False):
        """
        Public method to load a new program to run.
        
        @param fn the filename to run (string)
        @param argv the commandline arguments to pass to the program (string)
        @param wd the working directory for the program (string)
        @keyparam autoFork flag indicating the automatic fork mode (boolean)
        @keyparam forkChild flag indicating to debug the child after forking (boolean)
        """
        wd = self.translate(wd, False)
        fn = self.translate(os.path.abspath(fn), False)
        self.__sendCommand('{0}{1}\n'.format(
            DebugProtocol.RequestForkMode, repr((autoFork, forkChild))))
        self.__sendCommand('{0}{1}|{2}|{3}\n'.format(
            DebugProtocol.RequestRun, wd, fn, str(Utilities.parseOptionString(argv))))
    
    def remoteCoverage(self, fn, argv, wd, erase=False):
        """
        Public method to load a new program to collect coverage data.
        
        @param fn the filename to run (string)
        @param argv the commandline arguments to pass to the program (string)
        @param wd the working directory for the program (string)
        @keyparam erase flag indicating that coverage info should be
            cleared first (boolean)
        """
        wd = self.translate(wd, False)
        fn = self.translate(os.path.abspath(fn), False)
        self.__sendCommand('{0}{1}@@{2}@@{3}@@{4:d}\n'.format(
            DebugProtocol.RequestCoverage, wd, fn, str(Utilities.parseOptionString(argv)),
             erase))

    def remoteProfile(self, fn, argv, wd, erase=False):
        """
        Public method to load a new program to collect profiling data.
        
        @param fn the filename to run (string)
        @param argv the commandline arguments to pass to the program (string)
        @param wd the working directory for the program (string)
        @keyparam erase flag indicating that timing info should be cleared first (boolean)
        """
        wd = self.translate(wd, False)
        fn = self.translate(os.path.abspath(fn), False)
        self.__sendCommand('{0}{1}|{2}|{3}|{4:d}\n'.format(
            DebugProtocol.RequestProfile, wd, fn,
            str(Utilities.parseOptionString(argv)), erase))

    def remoteStatement(self, stmt):
        """
        Public method to execute a Python statement.
        
        @param stmt the Python statement to execute (string). It
              should not have a trailing newline.
        """
        self.__sendCommand('{0}\n'.format(stmt))
        self.__sendCommand(DebugProtocol.RequestOK + '\n')

    def remoteStep(self):
        """
        Public method to single step the debugged program.
        """
        self.__sendCommand(DebugProtocol.RequestStep + '\n')

    def remoteStepOver(self):
        """
        Public method to step over the debugged program.
        """
        self.__sendCommand(DebugProtocol.RequestStepOver + '\n')

    def remoteStepOut(self):
        """
        Public method to step out the debugged program.
        """
        self.__sendCommand(DebugProtocol.RequestStepOut + '\n')

    def remoteStepQuit(self):
        """
        Public method to stop the debugged program.
        """
        self.__sendCommand(DebugProtocol.RequestStepQuit + '\n')

    def remoteContinue(self, special=False):
        """
        Public method to continue the debugged program.
        
        @param special flag indicating a special continue operation
        """
        self.__sendCommand('{0}{1:d}\n'.format(DebugProtocol.RequestContinue, special))

    def remoteBreakpoint(self, fn, line, set, cond=None, temp=False):
        """
        Public method to set or clear a breakpoint.
        
        @param fn filename the breakpoint belongs to (string)
        @param line linenumber of the breakpoint (int)
        @param set flag indicating setting or resetting a breakpoint (boolean)
        @param cond condition of the breakpoint (string)
        @param temp flag indicating a temporary breakpoint (boolean)
        """
        fn = self.translate(fn, False)
        self.__sendCommand('{0}{1}@@{2:d}@@{3:d}@@{4:d}@@{5}\n'.format(
                           DebugProtocol.RequestBreak, fn, line, temp, set, cond))
    
    def remoteBreakpointEnable(self, fn, line, enable):
        """
        Public method to enable or disable a breakpoint.
        
        @param fn filename the breakpoint belongs to (string)
        @param line linenumber of the breakpoint (int)
        @param enable flag indicating enabling or disabling a breakpoint (boolean)
        """
        fn = self.translate(fn, False)
        self.__sendCommand('{0}{1},{2:d},{3:d}\n'.format(
            DebugProtocol.RequestBreakEnable, fn, line, enable))
    
    def remoteBreakpointIgnore(self, fn, line, count):
        """
        Public method to ignore a breakpoint the next couple of occurrences.
        
        @param fn filename the breakpoint belongs to (string)
        @param line linenumber of the breakpoint (int)
        @param count number of occurrences to ignore (int)
        """
        fn = self.translate(fn, False)
        self.__sendCommand('{0}{1},{2:d},{3:d}\n'.format(
            DebugProtocol.RequestBreakIgnore, fn, line, count))
    
    def remoteWatchpoint(self, cond, set, temp=False):
        """
        Public method to set or clear a watch expression.
        
        @param cond expression of the watch expression (string)
        @param set flag indicating setting or resetting a watch expression (boolean)
        @param temp flag indicating a temporary watch expression (boolean)
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.__sendCommand('{0}{1}@@{2:d}@@{3:d}\n'.format(
            DebugProtocol.RequestWatch, cond, temp, set))
    
    def remoteWatchpointEnable(self, cond, enable):
        """
        Public method to enable or disable a watch expression.
        
        @param cond expression of the watch expression (string)
        @param enable flag indicating enabling or disabling a watch expression (boolean)
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.__sendCommand('{0}{1},{2:d}\n'.format(
            DebugProtocol.RequestWatchEnable, cond, enable))
    
    def remoteWatchpointIgnore(self, cond, count):
        """
        Public method to ignore a watch expression the next couple of occurrences.
        
        @param cond expression of the watch expression (string)
        @param count number of occurrences to ignore (int)
        """
        # cond is combination of cond and special (s. watch expression viewer)
        self.__sendCommand('{0}{1},{2:d}\n'.format(
            DebugProtocol.RequestWatchIgnore, cond, count))
    
    def remoteRawInput(self, s):
        """
        Public method to send the raw input to the debugged program.
        
        @param s the raw input (string)
        """
        self.__sendCommand(s + '\n')
    
    def remoteThreadList(self):
        """
        Public method to request the list of threads from the client.
        """
        self.__sendCommand('{0}\n'.format(DebugProtocol.RequestThreadList))
        
    def remoteSetThread(self, tid):
        """
        Public method to request to set the given thread as current thread.
        
        @param tid id of the thread (integer)
        """
        self.__sendCommand('{0}{1:d}\n'.format(DebugProtocol.RequestThreadSet, tid))
        
    def remoteClientVariables(self, scope, filter, framenr=0):
        """
        Public method to request the variables of the debugged program.
        
        @param scope the scope of the variables (0 = local, 1 = global)
        @param filter list of variable types to filter out (list of int)
        @param framenr framenumber of the variables to retrieve (int)
        """
        self.__sendCommand('{0}{1:d}, {2:d}, {3}\n'.format(
            DebugProtocol.RequestVariables, framenr, scope, str(filter)))
    
    def remoteClientVariable(self, scope, filter, var, framenr=0):
        """
        Public method to request the variables of the debugged program.
        
        @param scope the scope of the variables (0 = local, 1 = global)
        @param filter list of variable types to filter out (list of int)
        @param var list encoded name of variable to retrieve (string)
        @param framenr framenumber of the variables to retrieve (int)
        """
        self.__sendCommand('{0}{1}, {2:d}, {3:d}, {4}\n'.format(
            DebugProtocol.RequestVariable, str(var), framenr, scope, str(filter)))
    
    def remoteClientSetFilter(self, scope, filter):
        """
        Public method to set a variables filter list.
        
        @param scope the scope of the variables (0 = local, 1 = global)
        @param filter regexp string for variable names to filter out (string)
        """
        self.__sendCommand('{0}{1:d}, "{2}"\n'.format(
            DebugProtocol.RequestSetFilter, scope, filter))
    
    def remoteEval(self, arg):
        """
        Public method to evaluate arg in the current context of the debugged program.
        
        @param arg the arguments to evaluate (string)
        """
        self.__sendCommand('{0}{1}\n'.format(DebugProtocol.RequestEval, arg))
    
    def remoteExec(self, stmt):
        """
        Public method to execute stmt in the current context of the debugged program.
        
        @param stmt statement to execute (string)
        """
        self.__sendCommand('{0}{1}\n'.format(DebugProtocol.RequestExec, stmt))
    
    def remoteBanner(self):
        """
        Public slot to get the banner info of the remote client.
        """
        self.__sendCommand(DebugProtocol.RequestBanner + '\n')
    
    def remoteCapabilities(self):
        """
        Public slot to get the debug clients capabilities.
        """
        self.__sendCommand(DebugProtocol.RequestCapabilities + '\n')
    
    def remoteCompletion(self, text):
        """
        Public slot to get the a list of possible commandline completions
        from the remote client.
        
        @param text the text to be completed (string)
        """
        self.__sendCommand("{0}{1}\n".format(DebugProtocol.RequestCompletion, text))
    
    def remoteUTPrepare(self, fn, tn, tfn, cov, covname, coverase):
        """
        Public method to prepare a new unittest run.
        
        @param fn the filename to load (string)
        @param tn the testname to load (string)
        @param tfn the test function name to load tests from (string)
        @param cov flag indicating collection of coverage data is requested
        @param covname filename to be used to assemble the coverage caches
                filename
        @param coverase flag indicating erasure of coverage data is requested
        """
        fn = self.translate(os.path.abspath(fn), False)
        self.__sendCommand('{0}{1}|{2}|{3}|{4:d}|{5}|{6:d}\n'.format(
            DebugProtocol.RequestUTPrepare, fn, tn, tfn, cov, covname, coverase))
    
    def remoteUTRun(self):
        """
        Public method to start a unittest run.
        """
        self.__sendCommand('{0}\n'.format(DebugProtocol.RequestUTRun))
    
    def remoteUTStop(self):
        """
        Public method to stop a unittest run.
        """
        self.__sendCommand('{0}\n'.format(DebugProtocol.RequestUTStop))
    
    def __askForkTo(self):
        """
        Private method to ask the user which branch of a fork to follow.
        """
        selections = [self.trUtf8("Parent Process"), self.trUtf8("Child process")]
        res, ok = QInputDialog.getItem(
            None,
            self.trUtf8("Client forking"),
            self.trUtf8("Select the fork branch to follow."),
            selections,
            0, False)
        if not ok or res == selections[0]:
            self.__sendCommand(DebugProtocol.ResponseForkTo + 'parent\n')
        else:
            self.__sendCommand(DebugProtocol.ResponseForkTo + 'child\n')
    
    def __parseClientLine(self):
        """
        Private method to handle data from the client.
        """
        while self.qsock and self.qsock.canReadLine():
            qs = self.qsock.readLine()
            if self.codec is not None:
                line = self.codec.toUnicode(qs)
            else:
                line = bytes(qs).decode()
            if line.endswith(DebugProtocol.EOT):
                line = line[:-len(DebugProtocol.EOT)]
                if not line:
                    continue
            
##            print("Server: ", line)          ##debug
            
            eoc = line.find('<') + 1
            
            # Deal with case where user has written directly to stdout
            # or stderr, but not line terminated and we stepped over the
            # write call, in that case the >line< will not be the first
            # string read from the socket...
            boc = line.find('>')
            if boc > 0 and eoc > boc:
                self.debugServer.signalClientOutput(line[:boc])
                line = line[boc:]
                eoc = line.find('<') + 1
                boc = line.find('>')
            
            if boc >= 0 and eoc > boc:
                resp = line[boc:eoc]
                
                if resp == DebugProtocol.ResponseLine or \
                   resp == DebugProtocol.ResponseStack:
                    stack = eval(line[eoc:-1])
                    for s in stack:
                        s[0] = self.translate(s[0], True)
                    cf = stack[0]
                    if self.__autoContinue:
                        self.__autoContinue = False
                        QTimer.singleShot(0, self.remoteContinue)
                    else:
                        self.debugServer.signalClientLine(cf[0], int(cf[1]),
                                                    resp == DebugProtocol.ResponseStack)
                        self.debugServer.signalClientStack(stack)
                    continue
                
                if resp == DebugProtocol.ResponseThreadList:
                    currentId, threadList = eval(line[eoc:-1])
                    self.debugServer.signalClientThreadList(currentId, threadList)
                    continue
                
                if resp == DebugProtocol.ResponseThreadSet:
                    self.debugServer.signalClientThreadSet()
                    continue
                
                if resp == DebugProtocol.ResponseVariables:
                    vlist = eval(line[eoc:-1])
                    scope = vlist[0]
                    try:
                        variables = vlist[1:]
                    except IndexError:
                        variables = []
                    self.debugServer.signalClientVariables(scope, variables)
                    continue
                
                if resp == DebugProtocol.ResponseVariable:
                    vlist = eval(line[eoc:-1])
                    scope = vlist[0]
                    try:
                        variables = vlist[1:]
                    except IndexError:
                        variables = []
                    self.debugServer.signalClientVariable(scope, variables)
                    continue
                
                if resp == DebugProtocol.ResponseOK:
                    self.debugServer.signalClientStatement(False)
                    continue
                
                if resp == DebugProtocol.ResponseContinue:
                    self.debugServer.signalClientStatement(True)
                    continue
                
                if resp == DebugProtocol.ResponseException:
                    exc = line[eoc:-1]
                    exc = self.translate(exc, True)
                    try:
                        exclist = eval(exc)
                        exctype = exclist[0]
                        excmessage = exclist[1]
                        stack = exclist[2:]
                        if stack and stack[0] and stack[0][0] == "<string>":
                            stack = []
                    except (IndexError, ValueError, SyntaxError):
                        exctype = None
                        excmessage = ''
                        stack = []
                    self.debugServer.signalClientException(exctype, excmessage, stack)
                    continue
                
                if resp == DebugProtocol.ResponseSyntax:
                    exc = line[eoc:-1]
                    exc = self.translate(exc, True)
                    try:
                        message, (fn, ln, cn) = eval(exc)
                        if fn is None:
                            fn = ''
                    except (IndexError, ValueError):
                        message = None
                        fn = ''
                        ln = 0
                        cn = 0
                    if cn is None:
                        cn = 0
                    self.debugServer.signalClientSyntaxError(message, fn, ln, cn)
                    continue
                
                if resp == DebugProtocol.ResponseExit:
                    self.debugServer.signalClientExit(line[eoc:-1])
                    continue
                
                if resp == DebugProtocol.ResponseClearBreak:
                    fn, lineno = line[eoc:-1].split(',')
                    lineno = int(lineno)
                    fn = self.translate(fn, True)
                    self.debugServer.signalClientClearBreak(fn, lineno)
                    continue
                
                if resp == DebugProtocol.ResponseBPConditionError:
                    fn, lineno = line[eoc:-1].split(',')
                    lineno = int(lineno)
                    fn = self.translate(fn, True)
                    self.debugServer.signalClientBreakConditionError(fn, lineno)
                    continue
                
                if resp == DebugProtocol.ResponseClearWatch:
                    cond = line[eoc:-1]
                    self.debugServer.signalClientClearWatch(cond)
                    continue
                
                if resp == DebugProtocol.ResponseWPConditionError:
                    cond = line[eoc:-1]
                    self.debugServer.signalClientWatchConditionError(cond)
                    continue
                
                if resp == DebugProtocol.ResponseRaw:
                    prompt, echo = eval(line[eoc:-1])
                    self.debugServer.signalClientRawInput(prompt, echo)
                    continue
                
                if resp == DebugProtocol.ResponseBanner:
                    version, platform, dbgclient = eval(line[eoc:-1])
                    self.debugServer.signalClientBanner(version, platform, dbgclient)
                    continue
                
                if resp == DebugProtocol.ResponseCapabilities:
                    cap, clType = eval(line[eoc:-1])
                    self.clientCapabilities = cap
                    self.debugServer.signalClientCapabilities(cap, clType)
                    continue
                
                if resp == DebugProtocol.ResponseCompletion:
                    clstring, text = line[eoc:-1].split('||')
                    cl = eval(clstring)
                    self.debugServer.signalClientCompletionList(cl, text)
                    continue
                
                if resp == DebugProtocol.PassiveStartup:
                    fn, exc = line[eoc:-1].split('|')
                    exc = bool(exc)
                    fn = self.translate(fn, True)
                    self.debugServer.passiveStartUp(fn, exc)
                    continue
                
                if resp == DebugProtocol.ResponseUTPrepared:
                    res, exc_type, exc_value = eval(line[eoc:-1])
                    self.debugServer.clientUtPrepared(res, exc_type, exc_value)
                    continue
                
                if resp == DebugProtocol.ResponseUTStartTest:
                    testname, doc = eval(line[eoc:-1])
                    self.debugServer.clientUtStartTest(testname, doc)
                    continue
                
                if resp == DebugProtocol.ResponseUTStopTest:
                    self.debugServer.clientUtStopTest()
                    continue
                
                if resp == DebugProtocol.ResponseUTTestFailed:
                    testname, traceback = eval(line[eoc:-1])
                    self.debugServer.clientUtTestFailed(testname, traceback)
                    continue
                
                if resp == DebugProtocol.ResponseUTTestErrored:
                    testname, traceback = eval(line[eoc:-1])
                    self.debugServer.clientUtTestErrored(testname, traceback)
                    continue
                
                if resp == DebugProtocol.ResponseUTFinished:
                    self.debugServer.clientUtFinished()
                    continue
                
                if resp == DebugProtocol.RequestForkTo:
                    self.__askForkTo()
                    continue
            
            self.debugServer.signalClientOutput(line)

    def __sendCommand(self, cmd):
        """
        Private method to send a single line command to the client.
        
        @param cmd command to send to the debug client (string)
        """
        if self.qsock is not None:
            self.qsock.write(cmd.encode('utf8', 'backslashreplace'))
        else:
            self.queue.append(cmd)