Add files via upload

brainfuck.py

@@ -0,0 +1,112 @@
+
+def file_input(filepath):
+	f = open(filepath)
+	global commands 
+	commands = f.read()
+	f.close()
+
+def execute(char, iteration = -1):	#implemet a limit at execution cycles
+	data = []
+	output = []
+	data_index = 0
+	command_index = 0
+	stopper=0
+	global commands
+	while command_index < len(commands):
+		stopper += 1
+		i = commands[command_index]
+		if len(data) == data_index:
+			data.append(0)
+		if i == '>':
+			data_index += 1
+		elif i == '<':
+			if data_index == 0:
+				data = [0] + data
+			else:
+				data_index -= 1
+		elif i == '+':
+			data[data_index] += 1
+		elif i == '-':
+			data[data_index] -=  1
+		elif i == '.':
+			if char:
+				output.append(chr(data[data_index]))
+			else:
+				output.append(data[data_index])
+		elif i == ',':
+			while True:
+				a = int(input ('Insert the datum at position ' + str(data_index+1) + ': '))
+				if (type(a) is int):
+					data[data_index] = a
+					break
+				else:
+					print('ERROR: inserted data type is invalid. Please insert an integer.\n')
+		elif i == '[':
+			if data[data_index] == 0:
+				count=0
+				chk=0
+				while True:
+					count += 1
+					if command_index+count >= len(commands):
+						print('ERROR: one or more \']\' are missing in your input string. Program terminated.')
+						commands = []
+						break
+					if commands[command_index+count] == ']' and chk == 0:
+						break
+					if commands[command_index+count] == ']' and chk != 0:
+						chk -= 1
+					if commands[command_index+count] == '[':
+						chk += 1
+				command_index += count
+		elif i == ']':
+			if data[data_index] != 0:
+				count=0
+				chk=0
+				while True:
+					count += 1
+					if command_index-count <= 0:
+						print('ERROR: one or more \'[\' are missing in your input string. Program terminated.')
+						commands = []
+						break
+					if commands[command_index-count] == '[' and chk == 0:
+						break
+					if commands[command_index-count] == '[' and chk != 0:
+						chk -= 1
+					if commands[command_index-count] == ']':
+						chk += 1
+				command_index -= count
+		command_index += 1
+		if iteration != -1 and stopper > iteration:
+			break
+	if len(output) > 0:
+		print('Program correctly executed. The output string is:\n')
+		print(output)
+		print()
+
+
+print("Welcome to the Brainfuck language interpreter! ------ v0.3.1 alpha release")
+print("Type 'help' for list of avaiable commands")
+commands = []
+output_char=False
+while True:
+	inp = input('>>>')
+	if inp == 'exit':
+		break
+	elif inp == 'help':
+		print("\n'filelaunch <name>' = execute instructions contained in the file <name>")
+		print("\n'launch <instructions>' = execute instructions from keybord input")
+		print("\n'outmode <type>' = choose output mode ('int' = integers, 'char' = characters) (default mode is set to 'int')")
+		print("\n'exit' = close the program\n")
+	elif inp[:11] == 'filelaunch ':
+			file_input(inp[11:])
+			execute(output_char)
+	elif inp[:7] == 'launch ':
+		commands = inp[7:]
+		execute(output_char)
+	elif inp == 'outmode char':
+		output_char=True
+	elif inp == 'outmode int':
+		output_char=False
+	else:
+		print("ERROR: invalid command\n")
+	inp=0