add contrib

reasoning_gym/code/contrib/bfit/Interpreter.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+
+import sys
+import argparse
+
+
+def create_jumps_dictionary(program):
+    lbraces = list()
+    res = dict()
+
+    for index, command in enumerate(program):
+        if command == '[':
+            lbraces.append(index)
+        elif command == ']':
+            if len(lbraces) == 0:
+                raise SyntaxError("Brainfuck: mismatched parentheses (at index: %s)" % index)
+
+            lbrace_index = lbraces.pop()
+            res[lbrace_index] = index
+            res[index] = lbrace_index
+
+    if len(lbraces) > 0:
+        raise SyntaxError("Brainfuck: mismatched parentheses (at indexes: %s)" % str(lbraces))
+    return res
+
+
+def brainfuck(program, bits=8):
+
+    jumps = create_jumps_dictionary(program)
+    data = dict()
+    data_pointer = 0
+
+    instruction_pointer = 0
+
+    while instruction_pointer < len(program):
+        command = program[instruction_pointer]
+
+        if command == '>':
+            data_pointer += 1
+        elif command == '<':
+            data_pointer -= 1
+        elif command == '+':
+            data[data_pointer] = (data.get(data_pointer, 0) + 1)
+            if data[data_pointer] == 2 ** bits:
+                data[data_pointer] = 0
+        elif command == '-':
+            data[data_pointer] = (data.get(data_pointer, 0) - 1)
+            if data[data_pointer] == -1:
+                data[data_pointer] = 2 ** bits - 1
+        elif command == ',':
+            data[data_pointer] = ord(sys.stdin.read(1)) % 256
+        elif command == '.':
+            print(chr(data.get(data_pointer, 0)), end='', flush=True)
+        elif command == '[':
+            if data.get(data_pointer, 0) == 0:
+                instruction_pointer = jumps[instruction_pointer]
+        elif command == ']':
+            if data.get(data_pointer, 0) != 0:
+                instruction_pointer = jumps[instruction_pointer]
+        else:  # everything else is comment
+            pass
+
+        instruction_pointer += 1
+
+    if data_pointer != 0:
+        print("WARNING (interpreter) - at the end of the execution the data pointer is %s instead of 0 (possibly a compiler issue)" % str(data_pointer))
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument("filepath")
+    parser.add_argument("--bits", "-b", "--interpreter-bits", type=int, default=8, help="Amount of bits each cell uses")
+
+    args = parser.parse_args()
+    with open(args.filepath, 'r') as f:
+        code = f.read()
+
+    brainfuck(code, args.bits)