def __init__(self, commandfolder, supershell=None):
# tests
self.logger = None
self.writer = None
self.prompt = "\n JTShell > "
self.source = commandfolder
# setting up the process list, that will be managing all ongoing processes within the shell, whenever the shell
# is closed, very ascociated process is closed aswell
self.processlist = ProcessList()
# creating the prcessors objects, that will be in charge of executing any issued command correctly
# the parser, which will convert the given string commands into a token list
self.parser = Parser(self)
# the analyzer, which will check the issued commands for any syntactical mistakes
self.analyzer = Analyzer(self)
# and finally the executer, that will ultimately start the command functions as new processes
self.executer = Executer(self)
# the parent shell, from which every subshell originates
self.supershell = supershell
class Shell:
"""
the actual Shell object, able to run user issued string commands with a customizable syntax concerning operators
and brackets use, fully coded in python, having up to no dependencies. Command line functions can be created by
simply adding a python module with the functions name to the chosen folder and having a run function within the
module, that will then be executed as the actual process within the shell.
:var logger: (logger) the logger object, that saves all of the shells activities inside a log file
:var prompt: (string) the command prompt to be displayed with the input collection method
:var processlist: (ProcessList) the object managing all currently running processes
:var parser: (Parser) the parser, converting the parameter objects into token lists
:var analyzer: (Analyzer) the analyzer, raising exceptions in case there are any syntactical mistakes
:var executer: (Executer) the executer, applying the syntax and executing the functions as processes
:var supershell: (Shell) the top level shell, from that the current shell has been created
:parameter supershell: (Shell) the top level shell, from that the current shell has been created
"""
def __init__(self, commandfolder, supershell=None):
# tests
self.logger = None
self.writer = None
self.prompt = "\n JTShell > "
self.source = commandfolder
# setting up the process list, that will be managing all ongoing processes within the shell, whenever the shell
# is closed, very ascociated process is closed aswell
self.processlist = ProcessList()
# creating the prcessors objects, that will be in charge of executing any issued command correctly
# the parser, which will convert the given string commands into a token list
self.parser = Parser(self)
# the analyzer, which will check the issued commands for any syntactical mistakes
self.analyzer = Analyzer(self)
# and finally the executer, that will ultimately start the command functions as new processes
self.executer = Executer(self)
# the parent shell, from which every subshell originates
self.supershell = supershell
def run(self):
"""
the main method of the shell running the infinite loop, continuesly prompting for a command, then attempting to
execute the issued command
:return: (void)
"""
# opening the infinite loop inside of a try statement, so that the SystemExit Exception can be caught
try:
while True:
# first fetching the user input
print(colors.magenta(colors.bold(self.prompt)), end="")
command = input()
if command == "exit":
if self.supershell is None:
sys.exit()
else:
break
# skipping the whole procedure in case the command prompt is empty
if command != "" and command != " ":
# then converting the command into a token list via the parse method
tokenlist = self.parser.parse(command)
# checking for any potential errors
try:
self.analyzer.analyze(tokenlist, command)
# in case the analyzer didnt raise any errors attempting to execute the tokenlist
last_process = self.executer.execute(tokenlist)
while not(last_process.status == "terminated"):
pass
if last_process.is_foreground():
print(Message("result", last_process.output).message)
except error.SyntaxError as e:
print(e.message.message)
except SystemExit as e:
pass
