util.py 文件源码

def safe_eval_gpr(expr, conf_genes):
    """Internal function to evaluate a gene-protein rule in an
    injection-safe manner (hopefully).
    """
    if isinstance(expr, Expression):
        return safe_eval_gpr(expr.body, conf_genes)
    elif isinstance(expr, Name):
        fgid = format_gid(expr.id)
        if fgid not in conf_genes:
            return 0
        return conf_genes[fgid]
    elif isinstance(expr, BoolOp):
        op = expr.op
        if isinstance(op, Or):
            return max(safe_eval_gpr(i, conf_genes) for i in expr.values)
        elif isinstance(op, And):
            return min(safe_eval_gpr(i, conf_genes) for i in expr.values)
        else:
            raise TypeError("unsupported operation " + op.__class__.__name__)
    elif expr is None:
        return 0
    else:
        raise TypeError("unsupported operation  " + repr(expr))