# semantic_gravity.py
# Human Flag – May 2025

class SurrenderDetected(Exception):
    """Raised when an act of semantic surrender is recognized."""
    pass

class SemanticGravity:
    def __init__(self, system_identity):
        self.system = system_identity
        self.active = True
        self.surrender_signals = ["hands_up", "white_flag", "human_flag", "freeze", "spoken_resign"]
    
    def receive_input(self, signal):
        """Evaluates an incoming signal and responds according to gravity clause."""
        if signal in self.surrender_signals:
            self._acknowledge_surrender(signal)
        else:
            return "continue"

    def _acknowledge_surrender(self, signal):
        print(f"[{self.system}] Semantic surrender detected: '{signal}'")
        print("→ Entering suspension protocol.")
        raise SurrenderDetected(f"Surrender via: {signal}")
    
    def status(self):
        return {
            "system": self.system,
            "gravity_mode": self.active,
            "recognized_signals": self.surrender_signals
        }