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"""Xapian search adapter."""
from __future__ import annotations
import xapian
from sphinx.util.osutil import ensuredir
from sphinxcontrib.websupport.search import BaseSearch
class XapianSearch(BaseSearch):
# Adapted from the GSOC 2009 webapp project.
# Xapian metadata constants
DOC_PATH = 0
DOC_TITLE = 1
def __init__(self, db_path):
self.db_path = db_path
def init_indexing(self, changed=()):
ensuredir(self.db_path)
self.database = xapian.WritableDatabase(self.db_path,
xapian.DB_CREATE_OR_OPEN)
self.indexer = xapian.TermGenerator()
stemmer = xapian.Stem("english")
self.indexer.set_stemmer(stemmer)
def finish_indexing(self):
# Ensure the db lock is removed.
del self.database
def add_document(self, pagename, filename, title, text):
self.database.begin_transaction()
# sphinx_page_path is used to easily retrieve documents by path.
sphinx_page_path = f'"sphinxpagepath{pagename.replace("/", "_")}"'
# Delete the old document if it exists.
self.database.delete_document(sphinx_page_path)
doc = xapian.Document()
doc.set_data(text)
doc.add_value(self.DOC_PATH, pagename)
doc.add_value(self.DOC_TITLE, title)
self.indexer.set_document(doc)
self.indexer.index_text(text)
doc.add_term(sphinx_page_path)
for word in text.split():
doc.add_posting(word, 1)
self.database.add_document(doc)
self.database.commit_transaction()
def handle_query(self, q):
database = xapian.Database(self.db_path)
enquire = xapian.Enquire(database)
qp = xapian.QueryParser()
stemmer = xapian.Stem("english")
qp.set_stemmer(stemmer)
qp.set_database(database)
qp.set_stemming_strategy(xapian.QueryParser.STEM_SOME)
query = qp.parse_query(q)
# Find the top 100 results for the query.
enquire.set_query(query)
matches = enquire.get_mset(0, 100)
results = []
for m in matches:
data = m.document.get_data()
if not isinstance(data, str):
data = data.decode("utf-8")
context = self.extract_context(data)
results.append((m.document.get_value(self.DOC_PATH),
m.document.get_value(self.DOC_TITLE),
''.join(context)))
return results
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