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In preparation for enabling queries over flexattrs, this is a new path that lets queries avoid generating SQLite expressions altogether. Any query that can be completely evaluated in SQLite will be, but when it can't, we now fall back to running the entire query in Python by selecting everything from the database and running the `match` predicate. To begin with, this mechanism replaces RegisteredFieldQueries, which previously used Python callbacks for evaluation. Now they just indicate that they're slow queries and the query system falls back automatically. This has the great upside that it lets use implement arbitrarily complex queries without shoehorning everything into SQLite when that (a) is way too complicated and (b) doesn't buy us much performance anyway. The obvious drawback is that any code dealing with queries now has to handle two cases (slow and fast). In the future, we could optimize this further by combing fast and slow query styles. For example, if you want to match with a substring *and* a regular expression, we can do a first pass in SQLite and apply the regex predicate on the results. Avoided for now because premature optimization, etc., etc. Next step: implement flexattr matches as slow queries.
45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
# This file is part of beets.
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# Copyright 2013, Philippe Mongeau.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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"""Provides a fuzzy matching query.
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"""
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from beets.plugins import BeetsPlugin
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from beets.library import FieldQuery
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import beets
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import difflib
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class FuzzyQuery(FieldQuery):
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@classmethod
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def value_match(self, pattern, val):
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# smartcase
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if pattern.islower():
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val = val.lower()
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queryMatcher = difflib.SequenceMatcher(None, pattern, val)
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threshold = beets.config['fuzzy']['threshold'].as_number()
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return queryMatcher.quick_ratio() >= threshold
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class FuzzyPlugin(BeetsPlugin):
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def __init__(self):
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super(FuzzyPlugin, self).__init__()
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self.config.add({
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'prefix': '~',
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'threshold': 0.7,
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})
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def queries(self):
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prefix = beets.config['fuzzy']['prefix'].get(basestring)
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return {prefix: FuzzyQuery}
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