(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);

});

})();