Convert stopwords to a JavaScript set (#13575)

Author: AA-Turner

sphinx/themes/basic/static/language_data.js.jinja

@@ -1,12 +1,13 @@
 /*
  * This script contains the language-specific data used by searchtools.js,
- * namely the list of stopwords, stemmer, scorer and splitter.
+ * namely the set of stopwords, stemmer, scorer and splitter.
  */
 
-var stopwords = {{ search_language_stop_words }};
+const stopwords = new Set({{ search_language_stop_words }});
+window.stopwords = stopwords;  // Export to global scope
 
 {% if search_language_stemming_code %}
-/* Non-minified version is copied as a separate JS file, if available */
+/* Non-minified versions are copied as separate JavaScript files, if available */
 {{ search_language_stemming_code|safe }}
 {% endif -%}
 

sphinx/themes/basic/static/searchtools.js

@@ -287,11 +287,8 @@ const Search = {
       const queryTermLower = queryTerm.toLowerCase();
 
       // maybe skip this "word"
-      // stopwords array is from language_data.js
-      if (
-        stopwords.indexOf(queryTermLower) !== -1 ||
-        queryTerm.match(/^\d+$/)
-      )
+      // stopwords set is from language_data.js
+      if (stopwords.has(queryTermLower) || queryTerm.match(/^\d+$/))
         return;
 
       // stem the word

tests/js/language_data.js

@@ -3,10 +3,11 @@
  * namely the list of stopwords, stemmer, scorer and splitter.
  */
 
-var stopwords = [];
+const stopwords = new Set([]);
+window.stopwords = stopwords;  // Export to global scope
 
 
-/* Non-minified version is copied as a separate JS file, if available */
+/* Non-minified versions are copied as separate JavaScript files, if available */
 
 /**
  * Dummy stemmer for languages without stemming rules.