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# Source code for sphinx.websupport.search

    # -*- coding: utf-8 -*-
    """
        sphinx.websupport.search
        ~~~~~~~~~~~~~~~~~~~~~~~~

        Server side search support for the web support package.

        :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
        :license: BSD, see LICENSE for details.
    """

    import re

    from six import text_type

    class BaseSearch(object):
        def __init__(self, path):
            pass

        def init_indexing(self, changed=[]):
            """Called by the builder to initialize the search indexer. `changed`
            is a list of pagenames that will be reindexed. You may want to remove
            these from the search index before indexing begins.

            :param changed: a list of pagenames that will be re-indexed
            """
            pass

        def finish_indexing(self):
            """Called by the builder when writing has been completed. Use this
            to perform any finalization or cleanup actions after indexing is
            complete.
            """
            pass

        def feed(self, pagename, title, doctree):
            """Called by the builder to add a doctree to the index. Converts the
            `doctree` to text and passes it to :meth:`add_document`. You probably
            won't want to override this unless you need access to the `doctree`.
            Override :meth:`add_document` instead.

            :param pagename: the name of the page to be indexed
            :param title: the title of the page to be indexed
            :param doctree: is the docutils doctree representation of the page
            """
            self.add_document(pagename, title, doctree.astext())

        def add_document(self, pagename, title, text):
            """Called by :meth:`feed` to add a document to the search index.
            This method should should do everything necessary to add a single
            document to the search index.

            `pagename` is name of the page being indexed. It is the combination
            of the source files relative path and filename,
            minus the extension. For example, if the source file is
            "ext/builders.rst", the `pagename` would be "ext/builders". This
            will need to be returned with search results when processing a
            query.

            :param pagename: the name of the page being indexed
            :param title: the page's title
            :param text: the full text of the page
            """
            raise NotImplementedError()

        def query(self, q):
            """Called by the web support api to get search results. This method
            compiles the regular expression to be used when :meth:`extracting
            context <extract_context>`, then calls :meth:`handle_query`.  You
            won't want to override this unless you don't want to use the included
            :meth:`extract_context` method.  Override :meth:`handle_query` instead.

            :param q: the search query string.
            """
            self.context_re = re.compile('|'.join(q.split()), re.I)
            return self.handle_query(q)

        def handle_query(self, q):
            """Called by :meth:`query` to retrieve search results for a search
            query `q`. This should return an iterable containing tuples of the
            following format::

                (<path>, <title>, <context>)

            `path` and `title` are the same values that were passed to
            :meth:`add_document`, and `context` should be a short text snippet
            of the text surrounding the search query in the document.

            The :meth:`extract_context` method is provided as a simple way
            to create the `context`.

            :param q: the search query
            """
            raise NotImplementedError()

        def extract_context(self, text, length=240):
            """Extract the context for the search query from the document's
            full `text`.

            :param text: the full text of the document to create the context for
            :param length: the length of the context snippet to return.
            """
            res = self.context_re.search(text)
            if res is None:
                return ''
            context_start = max(res.start() - int(length/2), 0)
            context_end = context_start + length
            context = ''.join([context_start > 0 and '...' or '',
                               text[context_start:context_end],
                               context_end < len(text) and '...' or ''])

            try:
                return text_type(context, errors='ignore')
            except TypeError:
                return context

        def context_for_searchtool(self):
            """Required by the HTML builder."""
            return {}

        def get_js_stemmer_rawcode(self):
            """Required by the HTML builder."""
            return None

    # The built-in search adapters.
    SEARCH_ADAPTERS = {
        'xapian': ('xapiansearch', 'XapianSearch'),
        'whoosh': ('whooshsearch', 'WhooshSearch'),
        'null':   ('nullsearch', 'NullSearch'),
    }