mirror of
https://github.com/ARM-software/devlib.git
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114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
# Copyright 2014-2015 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""
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Routines for doing various type conversions. These usually embody some higher-level
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semantics than are present in standard Python types (e.g. ``boolean`` will convert the
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string ``"false"`` to ``False``, where as non-empty strings are usually considered to be
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``True``).
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A lot of these are intened to stpecify type conversions declaratively in place like
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``Parameter``'s ``kind`` argument. These are basically "hacks" around the fact that Python
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is not the best language to use for configuration.
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"""
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import math
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from devlib.utils.misc import isiterable, to_identifier, ranges_to_list, list_to_mask
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def identifier(text):
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"""Converts text to a valid Python identifier by replacing all
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whitespace and punctuation."""
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return to_identifier(text)
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def boolean(value):
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"""
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Returns bool represented by the value. This is different from
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calling the builtin bool() in that it will interpret string representations.
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e.g. boolean('0') and boolean('false') will both yield False.
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"""
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false_strings = ['', '0', 'n', 'no', 'off']
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if isinstance(value, basestring):
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value = value.lower()
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if value in false_strings or 'false'.startswith(value):
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return False
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return bool(value)
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def integer(value):
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"""Handles conversions for string respresentations of binary, octal and hex."""
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if isinstance(value, basestring):
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return int(value, 0)
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else:
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return int(value)
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def numeric(value):
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"""
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Returns the value as number (int if possible, or float otherwise), or
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raises ``ValueError`` if the specified ``value`` does not have a straight
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forward numeric conversion.
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"""
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if isinstance(value, int):
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return value
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try:
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fvalue = float(value)
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except ValueError:
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raise ValueError('Not numeric: {}'.format(value))
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if not math.isnan(fvalue) and not math.isinf(fvalue):
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ivalue = int(fvalue)
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if ivalue == fvalue: # yeah, yeah, I know. Whatever. This is best-effort.
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return ivalue
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return fvalue
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class caseless_string(str):
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"""
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Just like built-in Python string except case-insensitive on comparisons. However, the
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case is preserved otherwise.
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"""
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def __eq__(self, other):
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if isinstance(other, basestring):
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other = other.lower()
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return self.lower() == other
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def __ne__(self, other):
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return not self.__eq__(other)
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def __cmp__(self, other):
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if isinstance(basestring, other):
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other = other.lower()
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return cmp(self.lower(), other)
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def format(self, *args, **kwargs):
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return caseless_string(super(caseless_string, self).format(*args, **kwargs))
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def bitmask(value):
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if isinstance(value, basestring):
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value = ranges_to_list(value)
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if isiterable(value):
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value = list_to_mask(value)
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if not isinstance(value, int):
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raise ValueError(value)
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return value
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