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# -*- coding: utf-8 -*- |
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# |
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# This file is part of SENAITE.CORE. |
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# |
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# SENAITE.CORE is free software: you can redistribute it and/or modify it under |
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# the terms of the GNU General Public License as published by the Free Software |
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# Foundation, version 2. |
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# |
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# This program is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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# details. |
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# |
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# You should have received a copy of the GNU General Public License along with |
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# this program; if not, write to the Free Software Foundation, Inc., 51 |
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# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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# |
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# Copyright 2018-2021 by it's authors. |
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# Some rights reserved, see README and LICENSE. |
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import re |
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import six |
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from bika.lims import APIError |
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from bika.lims.api import fail |
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from magnitude import Magnitude |
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from magnitude import MagnitudeError |
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from magnitude import mg |
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from magnitude import new_mag |
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_marker = object() |
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def is_magnitude(value): |
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"""Returns whether the value is a magnitude object |
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:param value: the object to check |
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:return: True if value is a magnitude object |
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:rtype: bool |
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""" |
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return isinstance(value, Magnitude) |
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def get_magnitude(value, default=_marker): |
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"""Returns the Magnitude object that represents the value |
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:param value: a string that representing a number and unit (e.g. 10 mL) |
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:param default: default value to convert to a magnitude object |
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:type value: str or Magnitude |
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:return: Magnitude object |
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:rtype: magnitude.Magnitude |
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""" |
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if is_magnitude(value): |
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# A Magnitude object already |
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return value |
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if not value or not isinstance(value, six.string_types): |
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# Handle empty and non-str values properly |
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if default is _marker: |
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fail("{} is not supported.".format(repr(value))) |
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return get_magnitude(default) |
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# Split number and unit(s) |
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matches = re.match(r"([.\d]+)\s*(\w+.*)", value) |
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groups = matches and matches.groups() or [] |
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if len(groups) != 2: |
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if default is _marker: |
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fail("No valid format: {}".format(value)) |
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return get_magnitude(default) |
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# L (litter) unit is commonly used to avoid confusion with the number 1, |
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# but is not supported by magnitude |
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# Create the magnitude for SI derived unit L (=litter) |
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# https://github.com/juanre/magnitude/blob/master/magnitude.py#L1147 |
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new_mag("L", Magnitude(0.001, m=3)) |
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# Get the magnitude |
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try: |
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return mg(float(groups[0]), groups[1]) |
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except MagnitudeError as e: |
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if default is _marker: |
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fail(e.message) |
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return get_magnitude(default) |
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def get_quantity(value, unit=None, num_digits=16): |
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"""Returns the quantity of the value that represents a number and unit |
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:param value: the value to extract the quantity from |
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:param unit: the basic or derived SI unit to convert to |
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:param num_digits: the number of digits to consider for rounding |
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:type value: str or Magnitude |
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:type unit: str |
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:return: the quantity of the value in the given units |
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:rtype: float |
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""" |
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mag = get_magnitude(value) |
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if unit: |
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mag.ounit(unit) |
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return round(mag.toval(), num_digits) |
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def is_volume(value): |
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"""Returns whether the value passed in represents a valid volume |
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:param value: the value to check |
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:type value: str or Magnitude |
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:return: True if the value passed in represents a volume |
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:rtype: bool |
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""" |
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try: |
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# Get the magnitude and check if can be converted to "l" (volume unit) |
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get_quantity(value, "l") |
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return True |
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except (MagnitudeError, APIError): |
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return False |
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def is_weight(value): |
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"""Returns whether the value passed in represents a valid weight |
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:param value: the value to check |
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:type value: str or Magnitude |
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:return: True if the value passed in represents a weight |
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:rtype: bool |
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""" |
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try: |
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# Get the magnitude and check if can be converted to "g" (weight unit) |
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get_quantity(value, "g") |
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return True |
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except (MagnitudeError, APIError): |
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return False |
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senaite /
senaite.core
