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https://github.com/avatao-content/baseimage-tutorial-framework
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111 lines
4.0 KiB
Python
111 lines
4.0 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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from shlex import split
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from re import search
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from tfw.decorators.lazy_property import lazy_property
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class CommandsEqual:
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# pylint: disable=too-many-arguments
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"""
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This class is useful for comparing executed commands with
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excepted commands (i.e. when triggering a state change when
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the correct command is executed).
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Note that in most cases you should test the changes
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caused by the commands instead of just checking command history
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(stuff can be done in countless ways and preparing for every
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single case is impossible). This should only be used when
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testing the changes would be very difficult, like when
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explaining stuff with cli tools and such.
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This class implicitly converts to bool, use it like
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if CommandsEqual(...): ...
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It tries detecting differing command parameter orders with similar
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semantics and provides fuzzy logic options.
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The rationale behind this is that a few false positives
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are better than only accepting a single version of a command
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(i.e. using ==).
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"""
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def __init__(
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self, command_1, command_2,
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fuzzyness=1, begin_similarly=True,
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include_patterns=None, exclude_patterns=None
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):
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"""
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:param command_1: Compared command 1
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:param command_2: Compared command 2
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:param fuzzyness: float between 0 and 1.
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the percentage of arguments required to
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match between commands to result in True.
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i.e 1 means 100% - all arguments need to be
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present in both commands, while 0.75
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would mean 75% - in case of 4 arguments
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1 could differ between the commands.
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:param begin_similarly: bool, the first word of the commands
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must match
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:param include_patterns: list of regex patterns the commands
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must include
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:param exclude_patterns: list of regex patterns the commands
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must exclude
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"""
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self.command_1 = split(command_1)
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self.command_2 = split(command_2)
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self.fuzzyness = fuzzyness
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self.begin_similarly = begin_similarly
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self.include_patterns = include_patterns
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self.exclude_patterns = exclude_patterns
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def __bool__(self):
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if self.begin_similarly:
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if not self.beginnings_are_equal:
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return False
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if self.include_patterns is not None:
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if not self.commands_contain_include_patterns:
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return False
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if self.exclude_patterns is not None:
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if not self.commands_contain_no_exclude_patterns:
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return False
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return self.similarity >= self.fuzzyness
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@lazy_property
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def beginnings_are_equal(self):
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return self.command_1[0] == self.command_2[0]
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@lazy_property
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def commands_contain_include_patterns(self):
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return all((
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self.contains_regex_patterns(self.command_1, self.include_patterns),
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self.contains_regex_patterns(self.command_2, self.include_patterns)
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))
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@lazy_property
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def commands_contain_no_exclude_patterns(self):
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return all((
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not self.contains_regex_patterns(self.command_1, self.exclude_patterns),
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not self.contains_regex_patterns(self.command_2, self.exclude_patterns)
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))
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@staticmethod
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def contains_regex_patterns(command, regex_parts):
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command = ' '.join(command)
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for pattern in regex_parts:
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if not search(pattern, command):
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return False
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return True
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@lazy_property
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def similarity(self):
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parts_1 = set(self.command_1)
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parts_2 = set(self.command_2)
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difference = parts_1 - parts_2
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deviance = len(difference) / len(max(parts_1, parts_2))
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return 1 - deviance
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