Pre-parse stopword lists

.gitattributes

@@ -62,4 +62,5 @@ tests/roots/test-pycode/cp_1251_coded.py working-tree-encoding=windows-1251
 
 tests/js/fixtures/**/*.js                           generated
 sphinx/search/minified-js/*.js                      generated
+sphinx/search/_stopwords/                           generated
 sphinx/themes/bizstyle/static/css3-mediaqueries.js  generated

sphinx/search/__init__.py

@@ -20,7 +20,7 @@
 from sphinx.util.index_entries import split_index_msg
 
 if TYPE_CHECKING:
-    from collections.abc import Callable, Iterable
+    from collections.abc import Callable, Iterable, Set
     from typing import Any, Protocol, TypeVar
 
     from docutils.nodes import Node
@@ -74,7 +74,7 @@ class SearchLanguage:
 
     lang: str = ''
     language_name: str = ''
-    stopwords: set[str] = set()
+    stopwords: Set[str] = frozenset()
     js_splitter_code: str = ''
     js_stemmer_rawcode: str = ''
     js_stemmer_code = """
@@ -128,9 +128,11 @@ def word_filter(self, word: str) -> bool:
 
 
 def parse_stop_word(source: str) -> set[str]:
-    """Parse snowball style word list like this:
+    """Collect the stopwords from a snowball style word list:
 
-    * https://snowballstem.org/algorithms/finnish/stop.txt
+    .. code:: text
+
+        list of space separated stop words | optional comment
     """
     result: set[str] = set()
     for line in source.splitlines():

sphinx/search/_stopwords/da.py

@@ -0,0 +1,98 @@
+from __future__ import annotations
+
+DANISH_STOPWORDS = frozenset({
+    'ad',
+    'af',
+    'alle',
+    'alt',
+    'anden',
+    'at',
+    'blev',
+    'blive',
+    'bliver',
+    'da',
+    'de',
+    'dem',
+    'den',
+    'denne',
+    'der',
+    'deres',
+    'det',
+    'dette',
+    'dig',
+    'din',
+    'disse',
+    'dog',
+    'du',
+    'efter',
+    'eller',
+    'en',
+    'end',
+    'er',
+    'et',
+    'for',
+    'fra',
+    'ham',
+    'han',
+    'hans',
+    'har',
+    'havde',
+    'have',
+    'hende',
+    'hendes',
+    'her',
+    'hos',
+    'hun',
+    'hvad',
+    'hvis',
+    'hvor',
+    'i',
+    'ikke',
+    'ind',
+    'jeg',
+    'jer',
+    'jo',
+    'kunne',
+    'man',
+    'mange',
+    'med',
+    'meget',
+    'men',
+    'mig',
+    'min',
+    'mine',
+    'mit',
+    'mod',
+    'ned',
+    'noget',
+    'nogle',
+    'nu',
+    'når',
+    'og',
+    'også',
+    'om',
+    'op',
+    'os',
+    'over',
+    'på',
+    'selv',
+    'sig',
+    'sin',
+    'sine',
+    'sit',
+    'skal',
+    'skulle',
+    'som',
+    'sådan',
+    'thi',
+    'til',
+    'ud',
+    'under',
+    'var',
+    'vi',
+    'vil',
+    'ville',
+    'vor',
+    'være',
+    'været',
+})

sphinx/search/_stopwords/da.txt

@@ -0,0 +1,95 @@
+| source: https://snowballstem.org/algorithms/danish/stop.txt
+og           | and
+i            | in
+jeg          | I
+det          | that (dem. pronoun)/it (pers. pronoun)
+at           | that (in front of a sentence)/to (with infinitive)
+en           | a/an
+den          | it (pers. pronoun)/that (dem. pronoun)
+til          | to/at/for/until/against/by/of/into, more
+er           | present tense of "to be"
+som          | who, as
+på           | on/upon/in/on/at/to/after/of/with/for, on
+de           | they
+med          | with/by/in, along
+han          | he
+af           | of/by/from/off/for/in/with/on, off
+for          | at/for/to/from/by/of/ago, in front/before, because
+ikke         | not
+der          | who/which, there/those
+var          | past tense of "to be"
+mig          | me/myself
+sig          | oneself/himself/herself/itself/themselves
+men          | but
+et           | a/an/one, one (number), someone/somebody/one
+har          | present tense of "to have"
+om           | round/about/for/in/a, about/around/down, if
+vi           | we
+min          | my
+havde        | past tense of "to have"
+ham          | him
+hun          | she
+nu           | now
+over         | over/above/across/by/beyond/past/on/about, over/past
+da           | then, when/as/since
+fra          | from/off/since, off, since
+du           | you
+ud           | out
+sin          | his/her/its/one's
+dem          | them
+os           | us/ourselves
+op           | up
+man          | you/one
+hans         | his
+hvor         | where
+eller        | or
+hvad         | what
+skal         | must/shall etc.
+selv         | myself/yourself/herself/ourselves etc., even
+her          | here
+alle         | all/everyone/everybody etc.
+vil          | will (verb)
+blev         | past tense of "to stay/to remain/to get/to become"
+kunne        | could
+ind          | in
+når          | when
+være         | present tense of "to be"
+dog          | however/yet/after all
+noget        | something
+ville        | would
+jo           | you know/you see (adv), yes
+deres        | their/theirs
+efter        | after/behind/according to/for/by/from, later/afterwards
+ned          | down
+skulle       | should
+denne        | this
+end          | than
+dette        | this
+mit          | my/mine
+også         | also
+under        | under/beneath/below/during, below/underneath
+have         | have
+dig          | you
+anden        | other
+hende        | her
+mine         | my
+alt          | everything
+meget        | much/very, plenty of
+sit          | his, her, its, one's
+sine         | his, her, its, one's
+vor          | our
+mod          | against
+disse        | these
+hvis         | if
+din          | your/yours
+nogle        | some
+hos          | by/at
+blive        | be/become
+mange        | many
+ad           | by/through
+bliver       | present tense of "to be/to become"
+hendes       | her/hers
+været        | be
+thi          | for (conj)
+jer          | you
+sådan        | such, like this/like that