Source code for habitat.sensors.base

# Copyright 2011 (C) Daniel Richman, Adam Greig
# This file is part of habitat.
# habitat is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# habitat is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with habitat.  If not, see <>.

Basic sensor functions.

These sensors cover simple ASCII representations of numbers and strings.

import math
import base64

__all__ = ["ascii_int", "ascii_float", "string", "constant", "binary_b64"]

[docs]def ascii_int(config, data): """ Parse *data* to an integer. """ if config.get("optional", False) and data == '': return None return int(data, config.get("base", 10))
[docs]def ascii_float(config, data): """ Parse *data* to a float. """ if config.get("optional", False) and data == '': return None val = float(data) if math.isnan(val) or math.isinf(val): raise ValueError("Cannot accept nan, inf or -inf") return val
[docs]def string(data): """ Returns *data* as a string. """ return str(data)
[docs]def constant(config, data): """ Checks that *data* is equal to config["expect"], returning None. """ if "expect" in config: expect = config["expect"] else: expect = '' if data != expect: raise ValueError("Expected '{0}', got '{1}'".format(expect, data)) return None
[docs]def binary_b64(data): """ Encodes raw binary data to base64. """ return base64.b64encode(data)