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# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
"""Phase 8: Boolean Token Engine — binary serialization of Boolean IR.
Input: Boolean IR
Output: BooleanTokenStream
Invariant: Decode(Encode(x)) == x for all canonical Boolean structures.
"""
from __future__ import annotations
import struct
from dataclasses import dataclass, field
from typing import Union
from .boolean_engine import (
AND, NOT, OR, XOR, BooleanAtom, BooleanExpression,
BooleanLiteral, BooleanVar, Expr,
)
from .types import BooleanOperator, FSMState, TokenError
# ── Token types ───────────────────────────────────────────────────────────────
TTYPE_LITERAL = 0x01
TTYPE_VAR = 0x02
TTYPE_VAR_NEG = 0x03
TTYPE_AND = 0x10
TTYPE_OR = 0x11
TTYPE_NOT = 0x12
TTYPE_XOR = 0x13
TTYPE_IMPLIES = 0x14
TTYPE_EQUIVALENCE = 0x15
TTYPE_TRUE = 0x20
TTYPE_FALSE = 0x21
TTYPE_OPEN = 0x30
TTYPE_CLOSE = 0x31
TTYPE_ARITY = 0x40
_OP_TO_TTYPE: dict[BooleanOperator, int] = {
BooleanOperator.AND: TTYPE_AND,
BooleanOperator.OR: TTYPE_OR,
BooleanOperator.NOT: TTYPE_NOT,
BooleanOperator.XOR: TTYPE_XOR,
BooleanOperator.IMPLIES: TTYPE_IMPLIES,
BooleanOperator.EQUIVALENCE: TTYPE_EQUIVALENCE,
BooleanOperator.TRUE: TTYPE_TRUE,
BooleanOperator.FALSE: TTYPE_FALSE,
}
_TTYPE_TO_OP: dict[int, BooleanOperator] = {v: k for k, v in _OP_TO_TTYPE.items()}
# ── Token ─────────────────────────────────────────────────────────────────────
@dataclass(frozen=True)
class BoolToken:
token_id: int
token_type: int
arity: int
position: int
payload: bytes = b""
semantic_reference: str = ""
temporal_reference: str = ""
geometry_reference: str = ""
def __repr__(self) -> str:
tname = {
TTYPE_LITERAL: "LIT", TTYPE_VAR: "VAR", TTYPE_VAR_NEG: "NEGVAR",
TTYPE_AND: "AND", TTYPE_OR: "OR", TTYPE_NOT: "NOT",
TTYPE_XOR: "XOR", TTYPE_TRUE: "TRUE", TTYPE_FALSE: "FALSE",
TTYPE_OPEN: "(", TTYPE_CLOSE: ")",
}.get(self.token_type, f"0x{self.token_type:02x}")
return f"Token({tname}, pos={self.position}, arity={self.arity})"
@dataclass
class BooleanTokenStream:
tokens: list[BoolToken] = field(default_factory=list)
def append(self, t: BoolToken) -> None:
self.tokens.append(t)
def __len__(self) -> int:
return len(self.tokens)
def __iter__(self):
return iter(self.tokens)
# ── Encoder ───────────────────────────────────────────────────────────────────
class BoolEncoder:
def __init__(self):
self._pos = 0
self._id = 0
self._stream = BooleanTokenStream()
def _tok(self, ttype: int, arity: int, payload: bytes = b"", sem_ref: str = "") -> BoolToken:
t = BoolToken(
token_id=self._id,
token_type=ttype,
arity=arity,
position=self._pos,
payload=payload,
semantic_reference=sem_ref,
)
self._id += 1
self._pos += 1
return t
def encode_expr(self, expr: Expr) -> BooleanTokenStream:
self._pos = 0
self._id = 0
self._stream = BooleanTokenStream()
self._encode(expr)
return self._stream
def _encode(self, expr: Expr) -> None:
if isinstance(expr, BooleanLiteral):
ttype = TTYPE_TRUE if expr.value else TTYPE_FALSE
self._stream.append(self._tok(ttype, 0, b"\x01" if expr.value else b"\x00"))
return
if isinstance(expr, BooleanVar):
ttype = TTYPE_VAR_NEG if expr.negated else TTYPE_VAR
payload = expr.name.encode("utf-8")
self._stream.append(self._tok(ttype, 0, payload, sem_ref=expr.name))
return
op = expr.operator
ttype = _OP_TO_TTYPE.get(op)
if ttype is None:
raise TokenError(FSMState.TOKENIZATION, f"Unknown operator: {op}")
arity = len(expr.operands)
self._stream.append(self._tok(TTYPE_OPEN, 0))
self._stream.append(self._tok(ttype, arity))
for operand in expr.operands:
self._encode(operand)
self._stream.append(self._tok(TTYPE_CLOSE, 0))
# ── Binary serialization ──────────────────────────────────────────────────────
_HEADER = b"BOOL"
_VERSION = 1
def encode_binary(stream: BooleanTokenStream) -> bytes:
"""
Binary format:
4 bytes magic: BOOL
1 byte version
4 bytes token count
per token: 1 byte type, 1 byte arity, 2 bytes payload_len, N bytes payload
"""
buf = bytearray()
buf += _HEADER
buf += struct.pack(">BH", _VERSION, len(stream.tokens))
for tok in stream.tokens:
pay = tok.payload[:255]
buf += struct.pack(">BBH", tok.token_type, tok.arity, len(pay))
buf += pay
return bytes(buf)
def decode_binary(data: bytes) -> BooleanTokenStream:
"""Inverse of encode_binary. Raises TokenError on malformed input."""
if len(data) < 7:
raise TokenError(FSMState.TOKENIZATION, "Binary data too short")
if data[:4] != _HEADER:
raise TokenError(FSMState.TOKENIZATION, f"Bad magic: {data[:4]!r}")
version, count = struct.unpack_from(">BH", data, 4)
if version != _VERSION:
raise TokenError(FSMState.TOKENIZATION, f"Unknown version {version}")
offset = 7
stream = BooleanTokenStream()
for i in range(count):
if offset + 4 > len(data):
raise TokenError(FSMState.TOKENIZATION, f"Truncated at token {i}")
ttype, arity, pay_len = struct.unpack_from(">BBH", data, offset)
offset += 4
payload = data[offset:offset + pay_len]
offset += pay_len
stream.append(BoolToken(
token_id=i, token_type=ttype, arity=arity,
position=i, payload=payload,
))
return stream
# ── Decoder (token stream → Boolean IR) ──────────────────────────────────────
class BoolDecoder:
def __init__(self, stream: BooleanTokenStream):
self._tokens = list(stream.tokens)
self._pos = 0
def _peek(self) -> BoolToken | None:
if self._pos >= len(self._tokens):
return None
return self._tokens[self._pos]
def _consume(self) -> BoolToken:
tok = self._tokens[self._pos]
self._pos += 1
return tok
def decode(self) -> Expr:
expr = self._decode_expr()
return expr
def _decode_expr(self) -> Expr:
tok = self._peek()
if tok is None:
raise TokenError(FSMState.TOKENIZATION, "Unexpected end of token stream")
if tok.token_type == TTYPE_TRUE:
self._consume()
return BooleanLiteral(True)
if tok.token_type == TTYPE_FALSE:
self._consume()
return BooleanLiteral(False)
if tok.token_type == TTYPE_VAR:
self._consume()
return BooleanVar(tok.payload.decode("utf-8"))
if tok.token_type == TTYPE_VAR_NEG:
self._consume()
return BooleanVar(tok.payload.decode("utf-8"), negated=True)
if tok.token_type == TTYPE_OPEN:
self._consume() # consume (
op_tok = self._consume()
op = _TTYPE_TO_OP.get(op_tok.token_type)
if op is None:
raise TokenError(FSMState.TOKENIZATION, f"Unknown op token 0x{op_tok.token_type:02x}")
operands = []
while True:
nxt = self._peek()
if nxt is None:
raise TokenError(FSMState.TOKENIZATION, "Missing CLOSE token")
if nxt.token_type == TTYPE_CLOSE:
self._consume()
break
operands.append(self._decode_expr())
return BooleanExpression(op, operands)
raise TokenError(FSMState.TOKENIZATION, f"Unexpected token type 0x{tok.token_type:02x}")
# ── Round-trip convenience ────────────────────────────────────────────────────
def encode(expr: Expr) -> bytes:
stream = BoolEncoder().encode_expr(expr)
return encode_binary(stream)
def decode(data: bytes) -> Expr:
stream = decode_binary(data)
return BoolDecoder(stream).decode()
def round_trip(expr: Expr) -> Expr:
return decode(encode(expr))
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