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59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
from peewee import NodeList, SQL, fn, Field
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def _escape_wildcard(search_query):
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"""
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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 = (
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search_query.replace("!", "!!").replace("%", "!%").replace("_", "!_").replace("[", "![")
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)
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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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"""
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Returns the wildcard match for searching for the given prefix query.
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"""
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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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"""
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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(
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(fn.MATCH(SQL("`%s`" % field.name)), fn.AGAINST(SQL("%s", [search_query]))), parens=True
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)
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def match_like(field, search_query):
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"""
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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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