377 lines
9.6 KiB
PHP
377 lines
9.6 KiB
PHP
<?php
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/*
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* Fork this project on GitHub!
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* https://github.com/Philipp15b/php-i18n
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*
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* License: MIT
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*/
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class i18n {
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/**
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* Language file path
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*
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* This is the path for the language files.
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* You must use the '{LANGUAGE}' placeholder for the language or
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* the script wont find any language files.
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*
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* @var string
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*/
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protected $filePath = './lang/lang_{LANGUAGE}.ini';
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/**
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* Cache file path
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*
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* This is the path for all the cache files.
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* Best is an empty directory with no other files in it.
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*
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* @var string
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*/
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protected $cachePath = './cache/lang/';
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/**
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* Fallback language
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*
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* This is the language which is used when there is no language file for
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* all other user languages.
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* It has the lowest priority.
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* Remember to create a language file for the fallback!!
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*
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* @var string
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*/
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protected $fallbackLang = 'en';
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/**
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* Merge in fallback language
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*
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* Whether to merge current language's strings with the strings of
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* the fallback language ($fallbackLang).
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*
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* @var bool
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*/
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protected $mergeFallback = true;
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/**
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* The class name of the compiled class that contains the translated texts.
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* @var string
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*/
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protected $prefix = 'L';
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/**
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* Forced language
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*
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* If you want to force a specific language define it here.
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*
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* @var string
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*/
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protected $forcedLang = NULL;
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/**
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* This is the separator used if you use sections in your ini-file
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*
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* For example, if you have a string 'greeting' in a section 'welcomepage'
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* you will can access it via 'L::welcomepage_greeting'.
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* If you changed it to 'ABC' you could access your string
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* via 'L::welcomepageABCgreeting'
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*
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* @var string
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*/
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protected $sectionSeparator = '_';
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/*
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* The following properties are only available after calling init().
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*/
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/**
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* User languages
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*
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* These are the languages the user uses.
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* Normally, if you use the getUserLangs-method this array will be
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* filled in like this:
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* 1. Forced language
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* 2. Language in $_GET['lang']
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* 3. Language in $_SESSION['lang']
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* 4. Fallback language
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*
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* @var array
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*/
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protected $userLangs = array();
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protected $appliedLang = NULL;
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protected $langFilePath = NULL;
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protected $cacheFilePath = NULL;
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protected $isInitialized = false;
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/**
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* Constructor
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*
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* The constructor sets all important settings.
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* All params are optional, you can set the options via extra functions too.
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*
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* @param string [$filePath] This is the path for the language files.
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* You must use the '{LANGUAGE}' placeholder for the language.
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* @param string [$cachePath] This is the path for all the cache files.
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* Best is an empty directory with no other files in it. No placeholders.
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* @param string [$fallbackLang] This is the language which is used
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* when there is no language file for all other user languages.
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* It has the lowest priority.
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* @param string [$prefix] The class name of the compiled class
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* that contains the translated texts. Defaults to 'L'.
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*/
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public function __construct(
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$filePath = NULL,
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$cachePath = NULL,
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$fallbackLang = NULL,
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$prefix = NULL)
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{
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// Apply settings
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if ($filePath != NULL) {
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$this->filePath = $filePath;
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}
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if ($cachePath != NULL) {
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$this->cachePath = $cachePath;
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}
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if ($fallbackLang != NULL) {
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$this->fallbackLang = $fallbackLang;
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}
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if ($prefix != NULL) {
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$this->prefix = $prefix;
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}
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}
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public function init() {
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if ($this->isInitialized()) {
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throw new BadMethodCallException(
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'This object from class ' . __CLASS__ .
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' is already initialized. ' .
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'It is not possible to init one object twice!');
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}
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$this->isInitialized = true;
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$this->userLangs = $this->getUserLangs();
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// search for language file
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$this->appliedLang = NULL;
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foreach ($this->userLangs as $priority => $langcode) {
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$this->langFilePath = $this->getConfigFilename($langcode);
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if (file_exists($this->langFilePath)) {
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$this->appliedLang = $langcode;
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break;
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}
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}
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if ($this->appliedLang == NULL) {
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throw new RuntimeException('No language file was found.');
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}
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// search for cache file
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$this->cacheFilePath =
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$this->cachePath . '/php_i18n_' . md5_file(__FILE__) . '_' .
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$this->prefix . '_' . $this->appliedLang . '.cache.php';
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// whether we need to create a new cache file
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$outdated = !file_exists($this->cacheFilePath) ||
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filemtime($this->cacheFilePath) < filemtime($this->langFilePath) || // the language config was updated
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($this->mergeFallback && filemtime($this->cacheFilePath) < filemtime($this->getConfigFilename($this->fallbackLang))); // the fallback language config was updated
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if ($outdated || true) {
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$config = $this->load($this->langFilePath);
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if ($this->mergeFallback)
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$config = array_replace_recursive($this->load($this->getConfigFilename($this->fallbackLang)), $config);
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$compiled =
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"<?php\n"
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. "class " . $this->prefix . " {\n"
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. $this->compile($config)
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. ' public static function __callStatic($string, $args) {' . "\n"
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. ' if (defined("self::" . $string)) {' . "\n"
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. ' return vsprintf(constant("self::" . $string), $args);' . "\n"
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. " }\n"
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. " }\n"
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. " function ".$this->prefix .'($string, $args=NULL) {' . "\n"
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. ' $return = constant("'.$this->prefix.'::".$string);' . "\n"
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. ' return $args ? vsprintf($return,$args) : $return;' . "\n"
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. " }\n"
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. '}';
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if( ! is_dir($this->cachePath)) {
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mkdir($this->cachePath, 0755, true);
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}
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if (file_put_contents($this->cacheFilePath, $compiled) === FALSE) {
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throw new Exception("Could not write cache file to path '" . $this->cacheFilePath . "'. Is it writable?");
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}
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chmod($this->cacheFilePath, 0755);
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}
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require_once $this->cacheFilePath;
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}
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public function isInitialized() {
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return $this->isInitialized;
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}
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public function getAppliedLang() {
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return $this->appliedLang;
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}
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public function getCachePath() {
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return $this->cachePath;
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}
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public function getFallbackLang() {
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return $this->fallbackLang;
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}
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public function setFilePath($filePath) {
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$this->fail_after_init();
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$this->filePath = $filePath;
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}
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public function setCachePath($cachePath) {
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$this->fail_after_init();
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$this->cachePath = $cachePath;
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}
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public function setFallbackLang($fallbackLang) {
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$this->fail_after_init();
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$this->fallbackLang = $fallbackLang;
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}
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public function setMergeFallback($mergeFallback) {
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$this->fail_after_init();
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$this->mergeFallback = $mergeFallback;
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}
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public function setPrefix($prefix) {
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$this->fail_after_init();
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$this->prefix = $prefix;
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}
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public function setForcedLang($forcedLang) {
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$this->fail_after_init();
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$this->forcedLang = $forcedLang;
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}
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public function setSectionSeparator($sectionSeparator) {
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$this->fail_after_init();
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$this->sectionSeparator = $sectionSeparator;
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}
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/**
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* @deprecated Use setSectionSeparator.
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*/
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public function setSectionSeperator($sectionSeparator) {
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$this->setSectionSeparator($sectionSeparator);
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}
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/**
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* Returns the user languages
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*
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* Normally it returns an array like this:
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* 1. Forced language
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* 2. Language in $_GET['lang']
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* 3. Language in $_SESSION['lang']
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* 4. HTTP_ACCEPT_LANGUAGE
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* 5. Fallback language
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* Note: duplicate values are deleted.
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*
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* @return array with the user languages sorted by priority.
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*/
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public function getUserLangs() {
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$userLangs = array();
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// Highest priority: forced language
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if ($this->forcedLang != NULL) {
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$userLangs[] = $this->forcedLang;
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}
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// 2nd highest priority: GET parameter 'lang'
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if (isset($_GET['lang']) && is_string($_GET['lang'])) {
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$userLangs[] = $_GET['lang'];
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}
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// 3rd highest priority: SESSION parameter 'lang'
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if (isset($_SESSION['lang']) && is_string($_SESSION['lang'])) {
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$userLangs[] = $_SESSION['lang'];
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}
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// 4th highest priority: HTTP_ACCEPT_LANGUAGE
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if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
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foreach (explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']) as $part) {
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$userLangs[] = strtolower(substr($part, 0, 2));
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}
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}
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// Lowest priority: fallback
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$userLangs[] = $this->fallbackLang;
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// remove duplicate elements
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$userLangs = array_unique($userLangs);
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// remove illegal userLangs
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$userLangs2 = array();
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foreach ($userLangs as $key => $value) {
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// only allow a-z, A-Z and 0-9 and _ and -
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if (preg_match('/^[a-zA-Z0-9_-]*$/', $value) === 1)
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$userLangs2[$key] = $value;
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}
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return $userLangs2;
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}
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protected function getConfigFilename($langcode) {
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return str_replace('{LANGUAGE}', $langcode, $this->filePath);
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}
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protected function load($filename) {
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$ext = substr(strrchr($filename, '.'), 1);
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switch ($ext) {
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case 'properties':
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case 'ini':
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$config = parse_ini_file($filename, true);
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break;
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case 'yml':
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case 'yaml':
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$config = spyc_load_file($filename);
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break;
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case 'json':
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$config = json_decode(file_get_contents($filename), true);
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break;
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default:
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throw new InvalidArgumentException($ext . " is not a valid extension!");
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}
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return $config;
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}
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/**
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* Recursively compile an associative array to PHP code.
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*/
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protected function compile($config, $prefix = '') {
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$code = '';
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foreach ($config as $key => $value) {
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if (is_array($value)) {
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$code .= $this->compile($value, $prefix . $key . $this->sectionSeparator);
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} else {
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$fullName = $prefix . $key;
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if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $fullName)) {
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throw new InvalidArgumentException(__CLASS__ . ": Cannot compile translation key " . $fullName . " because it is not a valid PHP identifier.");
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}
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$code .= ' const ' . $fullName . ' = \'' . str_replace('\'', '\\\'', $value) . "';\n";
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}
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}
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return $code;
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}
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protected function fail_after_init() {
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if ($this->isInitialized()) {
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throw new BadMethodCallException('This ' . __CLASS__ . ' object is already initalized, so you can not change any settings.');
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}
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}
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}
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