53 lines
2 KiB
Python
53 lines
2 KiB
Python
from peewee import NodeList, SQL, fn, TextField, Field
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def _escape_wildcard(search_query):
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""" Escapes the wildcards found in the given search query so that they are treated as *characters*
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rather than wildcards when passed to a LIKE or ILIKE clause with an ESCAPE '!'.
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"""
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search_query = (search_query
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.replace('!', '!!')
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.replace('%', '!%')
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.replace('_', '!_')
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.replace('[', '!['))
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# Just to be absolutely sure.
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search_query = search_query.replace('\'', '')
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search_query = search_query.replace('"', '')
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search_query = search_query.replace('`', '')
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return search_query
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def prefix_search(field, prefix_query):
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""" Returns the wildcard match for searching for the given prefix query. """
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# Escape the known wildcard characters.
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prefix_query = _escape_wildcard(prefix_query)
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return Field.__pow__(field, NodeList((prefix_query + '%', SQL("ESCAPE '!'"))))
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def match_mysql(field, search_query):
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""" Generates a full-text match query using a Match operation, which is needed for MySQL.
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"""
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if field.name.find('`') >= 0: # Just to be safe.
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raise Exception("How did field name '%s' end up containing a backtick?" % field.name)
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# Note: There is a known bug in MySQL (https://bugs.mysql.com/bug.php?id=78485) that causes
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# queries of the form `*` to raise a parsing error. If found, simply filter out.
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search_query = search_query.replace('*', '')
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# Just to be absolutely sure.
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search_query = search_query.replace('\'', '')
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search_query = search_query.replace('"', '')
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search_query = search_query.replace('`', '')
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return NodeList((fn.MATCH(SQL("`%s`" % field.name)), fn.AGAINST(SQL('%s', [search_query]))),
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parens=True)
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def match_like(field, search_query):
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""" Generates a full-text match query using an ILIKE operation, which is needed for SQLite and
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Postgres.
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"""
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escaped_query = _escape_wildcard(search_query)
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clause = NodeList(('%' + escaped_query + '%', SQL("ESCAPE '!'")))
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return Field.__pow__(field, clause)
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