bpo-31045: Language switch (#2652) (#3024)
* Doc: Indicate the language
* Renaming version_switcher to switchers (to add language_switcher).
* Adding language switch.
* Doc switchers: Enhance readability of regex parsing versions.
* Doc switchers: Desambiguate the need of a replace(/\/+$/g, '') by proper naming.
* Doc switchers: py3k can't reach js, it's redirected server-side by nginx.
* Doc switchers: Examples matching actual regexes.
* Doc switchers: Better fallback on unexisting translated version.
(cherry picked from commit dff9b5f9d62aa0b23f8a255867d09d11890efd1b)
diff --git a/Doc/tools/static/switchers.js b/Doc/tools/static/switchers.js
new file mode 100644
index 0000000..470ff6d
--- /dev/null
+++ b/Doc/tools/static/switchers.js
@@ -0,0 +1,146 @@
+(function() {
+ 'use strict';
+
+ // Parses versions in URL segments like:
+ // "3", "dev", "release/2.7" or "3.6rc2"
+ var version_regexs = [
+ '(?:\\d)',
+ '(?:\\d\\.\\d[\\w\\d\\.]*)',
+ '(?:dev)',
+ '(?:release/\\d.\\d[\\x\\d\\.]*)'];
+
+ var all_versions = {
+ '3.7': 'dev (3.7)',
+ '3.6': '3.6',
+ '3.5': '3.5',
+ '3.4': '3.4',
+ '3.3': '3.3',
+ '2.7': '2.7',
+ };
+
+ var all_languages = {
+ 'en': 'English',
+ 'fr': 'Français',
+ };
+
+ function build_version_select(current_version, current_release) {
+ var buf = ['<select>'];
+
+ $.each(all_versions, function(version, title) {
+ buf.push('<option value="' + version + '"');
+ if (version == current_version)
+ buf.push(' selected="selected">' + current_release + '</option>');
+ else
+ buf.push('>' + title + '</option>');
+ });
+
+ buf.push('</select>');
+ return buf.join('');
+ }
+
+ function build_language_select(current_language) {
+ var buf = ['<select>'];
+
+ $.each(all_languages, function(language, title) {
+ if (language == current_language)
+ buf.push('<option value="' + language + '" selected="selected">' +
+ all_languages[current_language] + '</option>');
+ else
+ buf.push('<option value="' + language + '">' + title + '</option>');
+ });
+ buf.push('</select>');
+ return buf.join('');
+ }
+
+ function navigate_to_first_existing(urls) {
+ // Navigate to the first existing URL in urls.
+ var url = urls.shift();
+ if (urls.length == 0) {
+ window.location.href = url;
+ return;
+ }
+ $.ajax({
+ url: url,
+ success: function() {
+ window.location.href = url;
+ },
+ error: function() {
+ navigate_to_first_existing(urls);
+ }
+ });
+ }
+
+ function on_version_switch() {
+ var selected_version = $(this).children('option:selected').attr('value') + '/';
+ var url = window.location.href;
+ var current_language = language_segment_from_url(url);
+ var current_version = version_segment_in_url(url);
+ var new_url = url.replace('.org/' + current_language + current_version,
+ '.org/' + current_language + selected_version);
+ if (new_url != url) {
+ navigate_to_first_existing([
+ new_url,
+ url.replace('.org/' + current_language + current_version,
+ '.org/' + selected_version),
+ 'https://docs.python.org/' + current_language + selected_version,
+ 'https://docs.python.org/' + selected_version,
+ 'https://docs.python.org/'
+ ]);
+ }
+ }
+
+ function on_language_switch() {
+ var selected_language = $(this).children('option:selected').attr('value') + '/';
+ var url = window.location.href;
+ var current_language = language_segment_from_url(url);
+ var current_version = version_segment_in_url(url);
+ if (selected_language == 'en/') // Special 'default' case for english.
+ selected_language = '';
+ var new_url = url.replace('.org/' + current_language + current_version,
+ '.org/' + selected_language + current_version);
+ if (new_url != url) {
+ navigate_to_first_existing([
+ new_url,
+ 'https://docs.python.org/'
+ ]);
+ }
+ }
+
+ // Returns the path segment of the language as a string, like 'fr/'
+ // or '' if not found.
+ function language_segment_from_url(url) {
+ var language_regexp = '\.org/(' + Object.keys(all_languages).join('|') + '/)';
+ var match = url.match(language_regexp);
+ if (match !== null)
+ return match[1];
+ return '';
+ }
+
+ // Returns the path segment of the version as a string, like '3.6/'
+ // or '' if not found.
+ function version_segment_in_url(url) {
+ var language_segment = '(?:(?:' + Object.keys(all_languages).join('|') + ')/)';
+ var version_segment = '(?:(?:' + version_regexs.join('|') + ')/)';
+ var version_regexp = '\\.org/' + language_segment + '?(' + version_segment + ')';
+ var match = url.match(version_regexp);
+ if (match !== null)
+ return match[1];
+ return ''
+ }
+
+ $(document).ready(function() {
+ var release = DOCUMENTATION_OPTIONS.VERSION;
+ var language_segment = language_segment_from_url(window.location.href);
+ var current_language = language_segment.replace(/\/+$/g, '') || 'en';
+ var version = release.substr(0, 3);
+ var version_select = build_version_select(version, release);
+
+ $('.version_switcher_placeholder').html(version_select);
+ $('.version_switcher_placeholder select').bind('change', on_version_switch);
+
+ var language_select = build_language_select(current_language);
+
+ $('.language_switcher_placeholder').html(language_select);
+ $('.language_switcher_placeholder select').bind('change', on_language_switch);
+ });
+})();