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<?php
const MESSAGE_DIR = __DIR__ . "/messages";
$__i18n_msg_store = [];
$__i18n_current_locale = null;
function i18n_parse(string $contents, ?string $filename = null): array {
$syntax_error = fn(string $msg, int $line): never =>
throw new Exception("i18n syntax error: $msg (in " . ($filename ?? "unknown") . ":" . $line . ")");
$other_error = fn(string $msg, int $line): never =>
throw new Exception("i18n error: $msg (in " . ($filename ?? "unknown") . ":" . $line . ")");
$msgs = [];
$lines = explode("\n", $contents);
$currentId = "";
$currentContext = "";
$currentMessage = "";
$isInMessage = false;
foreach ($lines as $i => $ln) {
$lnNum = $i + 1;
if (trim($ln) === "")
continue;
switch ($ln[0]) {
case "#":
continue 2;
case ":":
if ($currentId !== "") {
if ($currentContext !== "")
$currentId = $currentContext . "\004" . $currentId;
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", $lnNum);
$msgs[$currentId] = $currentMessage;
}
$currentId = json_decode(substr($ln, 2));
$currentContext = "";
$currentMessage = "";
$isInMessage = false;
break;
case "=":
$isInMessage = true;
$currentMessage = json_decode(substr($ln, 2));
break;
case "?":
if ($isInMessage)
$syntax_error("context must be defined before start of message", $lnNum);
$currentContext = json_decode(substr($ln, 2));
break;
case " ":
if ($isInMessage)
$currentMessage .= json_decode(substr($ln, 2));
else
$currentId .= json_decode(substr($ln, 2));
break;
default:
$syntax_error("invalid start of line '" . $ln[0] . "' (0x" . str_pad(strtoupper(dechex(ord($ln[0]))), 2, "0", STR_PAD_LEFT) . ")", $lnNum);
break;
}
}
if ($currentId !== "") {
if ($currentContext !== "")
$currentId = $currentContext . "\x7F" . $currentId;
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", count($lines));
$msgs[$currentId] = $currentMessage;
}
return $msgs;
}
function i18n_locale(string $locale) {
global $__i18n_current_locale;
$__i18n_current_locale = $locale;
}
function i18n_get(string $msgid, array $params = [], ?string $context = null): string {
global $__i18n_current_locale, $__i18n_msg_store;
$key = $msgid;
if ($context !== null)
$key = $context . "\x7F" . $msgid;
$msg = ($__i18n_msg_store[$__i18n_current_locale] ?? [])[$msgid] ?? $key;
uksort($params, fn(string $a, string $b): int => strlen($b) <=> strlen($a));
return str_replace(
array_map(fn(string $k): string => "%$k%", array_keys($params)),
array_values($params),
$msg
);
}
function __(string $msgid, array $params = [], ?string $context = null): string {
return i18n_get($msgid, $params, $context);
}
foreach (scandir(MESSAGE_DIR) as $ent) {
$path = MESSAGE_DIR . "/" . $ent;
if ($ent[0] === "." || !is_file($path) || strcasecmp(pathinfo($ent, PATHINFO_EXTENSION), "msg") !== 0)
continue;
$lang = pathinfo($ent, PATHINFO_FILENAME);
$__i18n_msg_store[$lang] = i18n_parse(file_get_contents($path), $ent);
}
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