po2js.php

<?php

/**
 * Download from: https://github.com/raulferras/PHP-po-parser/tree/master/src/Sepia
 */
include('./libs/Sepia/InterfaceHandler.php');
include('./libs/Sepia/FileHandler.php');
include('./libs/Sepia/StringHandler.php');
include('./libs/Sepia/PoParser.php');


/**
 * Example config.json
 {
    "mainlanguage": "vn",
    "sublanguages": ["en"],
    "input": "./po",
    "output": "../js/language"
 }
 */
$confJson = file_get_contents('config.json');
$conf = json_decode($confJson, true);

//Check valid config format (JSON)
if (is_null($conf)) {
    die('Config is invalid format. (JSON format required).');
}

//Check valid main language string and directory
if ($conf['mainlanguage'] == '' || !file_exists($conf['input'])
    || !file_exists($conf['input'] . DIRECTORY_SEPARATOR . $conf['mainlanguage'])) {
    die('Main Language Directory is not found or not existed.');
}

//Check readable of main language
if (!is_readable($conf['input'] . DIRECTORY_SEPARATOR . $conf['mainlanguage'])) {
    die('Main Language Directory is not readable.');
}

//Check sublanguage directory
if (is_array($conf['sublanguages']) && !empty($conf['sublanguages'])) {
    foreach ($conf['sublanguages'] as $sublanguage) {
        if (!file_exists($conf['input'] . DIRECTORY_SEPARATOR . $sublanguage)) {
            die('Sub Language Directory is not found. ('.$sublanguage.')');
        }

        if (!is_readable($conf['input'] . DIRECTORY_SEPARATOR . $sublanguage)) {
            die('Sub Language Directory is not readable. ('.$sublanguage.')');
        }
    }
}


//Check existed output directory
if ($conf['output'] == '' || !file_exists($conf['output'])) {
    die('Output Directory is not set or not existed.');
}


//Check writable of output directory
if (!is_writable($conf['output'])) {
    die('Output Directory is not writable.');
}

///////////////////////////////////////////////////
/// Everything is OK now
/// Start combine and convert
/// to JS object and save to output directory
$mainDirectory = $conf['input'] . DIRECTORY_SEPARATOR . $conf['mainlanguage'];
$mainFiles = scandir($mainDirectory);
$mainPoFiles = array();
foreach ($mainFiles as $mainFile) {
    if ($mainFile != '.' && $mainFile != '..' && substr($mainFile, strrpos($mainFile, '.') + 1) == 'po') {
        $mainPoFiles[] = $mainFile;
    }
}

//Check if main po directory is empty
if (empty($mainPoFiles)) {
    die('There is no PO file in main language.');
}

///////////////////////////////////////////////////
/// Start reading po contents
echo 'Processed files:' . PHP_EOL;

foreach ($mainPoFiles as $i => $mainPoFile) {
    $poFilePath = $mainDirectory . DIRECTORY_SEPARATOR . $mainPoFile;
    echo ($i + 1) . '> ' . $poFilePath . PHP_EOL;
    if (!is_readable($poFilePath)) {
        die('Can not read PO file "'.$poFilePath.'"');
    }

    //init data for current language file
    $outputLangData = array();
    $outputLangData[$conf['mainlanguage']] = array();


    //parsing sub PO
    $subPoDataByLang = array();
    foreach ($conf['sublanguages'] as $sublanguage) {

        //init for sublanguage
        $outputLangData[$sublanguage] = array();
        $subPoFilePath = $conf['input'] . DIRECTORY_SEPARATOR . $sublanguage . DIRECTORY_SEPARATOR . $mainPoFile;

        if (!file_exists($subPoFilePath) || !is_readable($subPoFilePath)) {
            die('Sub language PO file "'.$subPoFilePath.'" not found or not readable.');
        }

        //build data for sublanguage
        $subPoDataByLang[$sublanguage] = array();

        $fileHandler = new \Sepia\FileHandler($subPoFilePath);
        $poParser = new \Sepia\PoParser($fileHandler);
        $entries  = $poParser->parse();


        foreach ($entries as $entry) {
            $subPoDataByLang[$sublanguage][$entry['msgid'][0]] = $entry['msgstr'][0];
        }
    }


    //parsing main PO
    $fileHandler = new \Sepia\FileHandler($poFilePath);
    $poParser = new \Sepia\PoParser($fileHandler);
    $entries  = $poParser->parse();


    foreach ($entries as $entry) {
        $outputLangData[$conf['mainlanguage']][$entry['msgid'][0]] = $entry['msgstr'][0];

        //process this entry for other sub languages
        // make sure all sub language will have the same entry number (msgid) as main language
        foreach ($conf['sublanguages'] as $sublanguage) {
            if (array_key_exists($entry['msgid'][0], $subPoDataByLang[$sublanguage])) {
                $outputLangData[$sublanguage][$entry['msgid'][0]] = $subPoDataByLang[$sublanguage][$entry['msgid'][0]];
            } else {
                $outputLangData[$sublanguage][$entry['msgid'][0]] = '';
            }
        }
    }

    $jsonData = json_encode($outputLangData, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);

    //remove quotes from key after pretty
    $jsonData = preg_replace('/"([^"]+)"\s*:\s*/', '$1:', $jsonData);

    $content = getLanguageJsTemplate($poFilePath, $jsonData);

    $outputFile = $conf['output'] . DIRECTORY_SEPARATOR . str_replace('.po', '.js', $mainPoFile);
    file_put_contents($outputFile, $content);
}


function getLanguageJsTemplate($poFilePath, $content)
{
    return "/** Content of this file is auto generated by PO converter from main file: {$poFilePath} */
define(['baselanguage'], function(BaseLanguage){

    var lang = {$content};

    return new BaseLanguage({lang: lang});
});
    ";
}