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update to support multiple symbols #14

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update to support multiple symbols #14

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7 changes: 6 additions & 1 deletion decider-repeated-word-list-reproduction/tm_tape.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ def __init__(
TM_bbchallenge_format: str,
before_head: str = "",
state: int = 0,
num_symbols: int = 2,
after_head: str = "",
head_looking_after: bool = True,
tape_extremity_infinite_zero: bool = True,
Expand All @@ -37,6 +38,7 @@ def __init__(
"""
self.TM_bbchallenge_format = TM_bbchallenge_format
self.state = state
self.num_symbols = num_symbols
self.head_looking_after = head_looking_after

self.before_head = list(before_head)
Expand Down Expand Up @@ -66,9 +68,12 @@ def read(self) -> str:
return "0" # Tape extension is implemented by the write operation

def current_transition(self) -> str:
state_offset = 3 * self.num_symbols * self.state
symbol_offset = 3 * current_read
offset = state_offset + symbol_offset
current_read = int(self.read())
return self.TM_bbchallenge_format.replace("_", "")[
6 * self.state + 3 * current_read : 6 * self.state + 3 * current_read + 3
offset : offset + 3
]

def write(self, to_write: str):
Expand Down