from .ConsoleApplication import ConsoleApplication

class REPLApplication (ConsoleApplication):

	def split_with_quotes(self, value : str):

		escaping = False
		in_quote = 0
		next = ""
		retval = [ ]
		quote_types = [ ]

		for i in range(0, len(value)):
			if value[i] == "\"" and not escaping:
				if in_quote == 0:
					in_quote = 1
					continue
				elif in_quote == 1:
					in_quote = 0

					quote_types.append(1)
					retval.append(next)
					next = ""
					continue

			elif value[i] == "'" and not escaping:
				if in_quote == 0:
					in_quote = 2
					continue
				elif in_quote == 2:
					in_quote = 0

					quote_types.append(2)
					retval.append(next)
					next = ""
					continue

			elif value[i] == "`" and not escaping:
				if in_quote == 0:
					in_quote = 3
					continue
				elif in_quote == 3:
					in_quote = 0
					
					quote_types.append(3)
					retval.append(next)
					next = ""
					continue

			elif value[i] == "\\" and not escaping:
				escaping = True
				continue

			elif value[i] == " " and in_quote == 0:
				if not next == "":
					quote_types.append(None)
					retval.append(next)
					
				next = ""
				escaping = False
				continue

			next += value[i]
			escaping = False

		if not next == "":
			quote_types.append(None)
			retval.append(next)
			next = ""

		return (retval, quote_types)

	def _start_internal(self):
		
		while (True):
			# print ("open    instance    attribute    relationship    close")
			input_str = input(self.get_prompt())
			(inp, quotes) = self.split_with_quotes(input_str)

			if inp[0] == "clear":
				self.clear()
				continue
			
			elif inp[0] == "exit":
				break

			elif inp[0] == "help":
				
				continue

			self.process_input(inp, quotes)

		exit(0)

	def get_prompt(self):
		return "> "

	def process_input(self, value, quotes):
		pass