Data update

Task/Execute-Brain-/Python/execute-brain-.py

@@ -0,0 +1,71 @@
+import sys
+from collections import deque
+from itertools import repeat
+
+
+def interpret(instructions: str, memory_size: int, eof: int | None = None) -> None:
+
+    jump_table: dict[int, int] = {}
+
+    def jump(ip: int) -> int:
+        if ip in jump_table:
+            return jump_table[ip]
+
+        if instructions[ip] == "[":
+            depth = 0
+            for i in range(ip, len(instructions)):
+                if instructions[i] == "[":
+                    depth += 1
+                elif instructions[i] == "]":
+                    depth -= 1
+                    if depth == 0:
+                        jump_table[ip] = i
+                        jump_table[i] = ip
+                        return i
+
+        elif instructions[ip] == "]":
+            depth = 0
+            for i in range(ip, -1, -1):
+                if instructions[i] == "]":
+                    depth += 1
+                elif instructions[i] == "[":
+                    depth -= 1
+                    if depth == 0:
+                        jump_table[ip] = i
+                        jump_table[i] = ip
+                        return i
+
+        raise Exception("unbalanced brackets")
+
+    tape = deque(repeat(0, memory_size), memory_size)
+    ip = 0
+
+    while ip < len(instructions):
+        op = instructions[ip]
+
+        if op == ">":
+            tape.rotate(-1)
+        elif op == "<":
+            tape.rotate()
+        elif op == "+":
+            tape[0] += 1
+        elif op == "-":
+            tape[0] -= 1
+        elif op == ",":
+            if ch := sys.stdin.read(1):
+                tape[0] = ord(ch)
+            elif eof is not None:
+                tape[0] = eof
+        elif op == ".":
+            sys.stdout.write(chr(tape[0]))
+        elif op == "[" and not tape[0]:
+            ip = jump(ip)
+        elif op == "]" and tape[0]:
+            ip = jump(ip)
+
+        ip += 1
+
+
+if __name__ == "__main__":
+    prog = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>."
+    interpret(prog, 10)