First commit for the code.

brainfuck.py

@@ -0,0 +1,82 @@
+import sys
+
+def get_loop_code(code, ip):
+    result = code[ip+1:]
+    level = 1
+    count = 0
+    while count < len(result) and level > 0:
+        if result[count] == '[':
+            level += 1
+
+        if result[count] == ']':
+            level -= 1
+
+        count += 1
+
+    return result[:count-1]
+
+
+def loop_code(code, cells, pointer, ip):
+    output = ""
+    while cells[pointer] != 0:
+        output += execute(code, cells, pointer, ip)
+
+
+def execute(code, cells, pointer = 0, ip = 0):
+    ip = 0
+    output = ""
+    while ip < len(code):
+        instruction = code[ip]
+        if instruction == '>':
+            pointer += 1
+
+            if pointer > len(cells):
+                pointer = 0
+
+        elif instruction == '<':
+            pointer -= 1
+
+            if pointer < 0:
+                pointer = len(cells)
+
+        elif instruction == '+':
+            cells[pointer] = cells[pointer] + 1
+
+        elif instruction == '-':
+            cells[pointer] = cells[pointer] - 1
+
+        elif instruction == '.':
+            output += chr(cells[pointer])
+
+        elif instruction == ',':
+            input_data = input()
+            if len(input_data) > 1:
+                data = ord(input_data[0])
+
+            else:
+                data = ord(input_data)
+
+            cells[pointer] = data
+
+        elif instruction == '[':
+            inner_code = get_loop_code(code, ip)
+            loop_code(inner_code, cells, pointer, ip)
+            ip += len(inner_code)    # Jump away after we executed the loop
+
+        ip += 1
+
+    return output
+
+
+if __name__ == "__main__":
+    code = """++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.< <+++++++++++++++.>.+++.------.--------.>+.>."""
+    if len(sys.argv) > 1:
+        filename = sys.argv[1]
+
+        with open(filename, 'r') as f:
+            code = f.read()
+
+    cells = [0] * 500
+    output = execute(code, cells)
+    print(output)
+