xref: /plugin/combo/ComboStrap/Lang.php (revision 37748cd8654635afbeca80942126742f0f4cc346) 
1<?php
2
3
4namespace ComboStrap;
5
6
7use dokuwiki\Cache\Cache;
8
9class Lang
10{
11
12    const CANONICAL = "lang";
13    const LANG_ATTRIBUTES = "lang";
14
15    /**
16     * Process the lang attribute
17     * https://www.w3.org/International/questions/qa-html-language-declarations
18     * @param TagAttributes $attributes
19     *
20     * Language supported:
21     * http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
22     *
23     * Common Locale Data Repository
24     * http://cldr.unicode.org/
25     * Data:
26     *   * http://www.unicode.org/Public/cldr/
27     *   * https://github.com/unicode-cldr/
28     *   * https://github.com/unicode-org/cldr-json
29     * The ''dir'' data is known as the ''characterOrder''
30     *
31     */
32    public static function processLangAttribute(&$attributes)
33    {
34
35
36        /**
37         * Adding the lang attribute
38         * if set
39         */
40        if ($attributes->hasComponentAttribute(self::LANG_ATTRIBUTES)) {
41            $langValue = $attributes->getValueAndRemove(self::LANG_ATTRIBUTES);
42            $attributes->addHtmlAttributeValue("lang", $langValue);
43
44            $languageDataCache = new Cache("combo_" . $langValue, ".json");
45            $cacheDataUsable = $languageDataCache->useCache();
46            if (!$cacheDataUsable) {
47
48                // Language about the data
49                $downloadUrl = "https://raw.githubusercontent.com/unicode-org/cldr-json/master/cldr-json/cldr-misc-modern/main/$langValue/layout.json";
50
51                $filePointer = @fopen($downloadUrl, 'r');
52                if ($filePointer != false) {
53
54                    $numberOfByte = @file_put_contents($languageDataCache->cache, $filePointer);
55                    if ($numberOfByte != false) {
56                        LogUtility::msg("The new language data ($langValue) was downloaded", LogUtility::LVL_MSG_INFO, self::CANONICAL);
57                        $cacheDataUsable = true;
58                    } else {
59                        LogUtility::msg("Internal error: The language data ($langValue) could no be written to ($languageDataCache->cache)", LogUtility::LVL_MSG_ERROR, self::CANONICAL);
60                    }
61
62                } else {
63
64                    LogUtility::msg("The data for the language ($langValue) could not be found at ($downloadUrl).", LogUtility::LVL_MSG_ERROR, self::CANONICAL);
65
66                }
67            }
68
69            if ($cacheDataUsable) {
70                $jsonAsArray = true;
71                $languageData = json_decode(file_get_contents($languageDataCache->cache), $jsonAsArray);
72                if($languageData==null){
73                    LogUtility::msg("We could not read the data from the language ($langValue). No direction was set.", LogUtility::LVL_MSG_ERROR, self::CANONICAL);
74                    return;
75                }
76                $characterOrder = $languageData["main"][$langValue]["layout"]["orientation"]["characterOrder"];
77                if ($characterOrder == "right-to-left") {
78                    $attributes->addHtmlAttributeValue("dir", "rtl");
79                } else {
80                    $attributes->addHtmlAttributeValue("dir", "ltr");
81                }
82            } else {
83                LogUtility::msg("The language direction cannot be set because no language data was found for the language ($langValue)", LogUtility::LVL_MSG_WARNING, self::CANONICAL);
84            }
85
86        }
87
88    }
89
90}
91