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<?php
use RR\Shunt\Context;
use RR\Shunt\Parser;
use RR\Shunt\Scanner;
const MESSAGE_DIR = __DIR__ . "/messages";
$__i18n_msg_store = [];
$__i18n_msg_store_plural = [];
$__i18n_msg_metadata = [];
/** @var string $__i18n_current_locale */
$__i18n_current_locale = "en";
const _I18N_MSGID = 0;
const _I18N_MSGSTR = 1;
const _I18N_MSGIDP = 2;
const _I18N_MSGSTRP = 3;
const _I18N_META = 10;
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 . ")");
$metadata = [];
$msgs = [];
$pmsgs = [];
$lines = explode("\n", $contents);
$currentId = "";
$currentContext = "";
$currentMessage = "";
$currentIdP = [];
$currentMessageP = [];
$currentMetadataBuffer = [];
$state = _I18N_MSGID;
$processedLines = 0;
foreach ($lines as $i => $ln) {
$lnNum = $i + 1;
if (trim($ln) === "")
continue;
if ($ln === "metadata({") {
if ($processedLines > 0)
$syntax_error("metadata must come first in file", $lnNum);
$currentMetadataBuffer []= "{";
$state = _I18N_META;
++$processedLines;
continue;
}
if ($state == _I18N_META) {
if ($ln === "})") {
$currentMetadataBuffer []= "}";
$state = _I18N_MSGSTR;
$currentMetadataBuffer = implode("\n", $currentMetadataBuffer);
$metadata = json_decode($currentMetadataBuffer, true);
} else {
$currentMetadataBuffer []= $ln;
}
++$processedLines;
continue;
}
switch ($ln[0]) {
case "#":
continue 2;
case ":":
if ($state === _I18N_MSGSTRP) {
// plural
if (count($currentIdP) > 0) {
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", $lnNum);
$pmsgs[$currentIdP[0]] = $currentMessageP;
}
} else {
// singular
if ($currentId !== "") {
if ($currentContext !== "")
$currentId = $currentContext . "\x7F" . $currentId;
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", $lnNum);
$msgs[$currentId] = $currentMessage;
}
}
$currentIdP = [];
$currentMessageP = [];
$currentId = "";
$currentContext = "";
$currentMessage = "";
if ($ln === ":...") {
// plural
$state = _I18N_MSGIDP;
} else {
// singular
$currentId = json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
$state = _I18N_MSGID;
}
break;
case "-":
if ($state === _I18N_MSGIDP) {
$_id = json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
if ($currentContext !== "")
$_id = $currentContext . "\x7F" . $_id;
$currentIdP []= $_id;
} elseif ($state === _I18N_MSGSTRP) {
$currentMessageP []= json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
} else
$syntax_error("cannot define multiple ids/messages in singular mode", $lnNum);
break;
case "=":
if ($ln === "=...") {
// plural
if ($state !== _I18N_MSGIDP)
$syntax_error("cannot start plural message in singular mode", $lnNum);
$state = _I18N_MSGSTRP;
} else {
// singular
$state = _I18N_MSGSTR;
$currentMessage = json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
}
break;
case "?":
if ($state !== _I18N_MSGID)
$syntax_error("context must be defined before start of message", $lnNum);
$currentContext = json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
break;
case " ":
if ($state === _I18N_MSGSTR)
$currentMessage .= json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
else
$currentId .= json_decode(substr($ln, 2)) ?? $syntax_error("malformed string", $lnNum);
break;
default:
$syntax_error("invalid start of line '" . $ln[0] . "' (0x" . str_pad(strtoupper(dechex(ord($ln[0]))), 2, "0", STR_PAD_LEFT) . ")", $lnNum);
break;
}
++$processedLines;
}
if ($state === _I18N_MSGSTRP) {
// plural
if (count($currentIdP) > 0) {
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", $lnNum);
$pmsgs[$currentIdP[0]] = $currentMessageP;
}
} else {
// singular
if ($currentId !== "") {
if ($currentContext !== "")
$currentId = $currentContext . "\x7F" . $currentId;
if (isset($msgs[$currentId]))
$other_error("duplicate message id '$currentId'", $lnNum);
$msgs[$currentId] = $currentMessage;
}
}
return [$metadata, $msgs, $pmsgs];
}
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 i18n_metadata(string $lang): array {
global $__i18n_msg_metadata;
return $__i18n_msg_metadata[$lang] ?? [];
}
function i18n_get_plural(string $msgid_singular, string $msgid_plural, int $count, array $params = [], ?string $context = null): string {
global $__i18n_current_locale, $__i18n_msg_metadata, $__i18n_msg_store_plural;
$key = $msgid_singular;
if ($context !== null)
$key = $context . "\x7F" . $key;
$msgs = ($__i18n_msg_store_plural[$__i18n_current_locale] ?? [])[$msgid_singular] ?? null;
$msg = "";
if ($msgs === null) {
$msg = $count === 1 ? $msgid_singular : $msgid_plural;
} else {
$expression = (($__i18n_msg_metadata[$__i18n_current_locale] ?? [])["plural"] ?? [])["indexMapping"] ?? "n == 1 ? 0 : 1";
$ctx = new Context();
$ctx->def("ifelse", function(bool $c, $a, $b) { return $c ? $a : $b; });
$ctx->def("n", $count);
$parser = new Parser(new Scanner($expression));
$index = $parser->reduce($ctx);
$index = max(0, min(count($msgs) - 1, $index));
$msg = $msgs[$index];
}
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 i18n_get_current_locale(): string {
global $__i18n_current_locale;
return $__i18n_current_locale;
}
function i18n_get_available_locales(): array {
global $__i18n_msg_store;
return [
"en",
...array_keys($__i18n_msg_store),
];
}
function i18n_get_message_store(string $locale): array {
global $__i18n_msg_store, $__i18n_msg_store_plural;
return [
$__i18n_msg_store[$locale] ?? (object)[],
$__i18n_msg_store_plural[$locale] ?? (object)[],
];
}
function __(string $msgid, array $params = [], ?string $context = null): string {
return i18n_get($msgid, $params, $context);
}
function ___(string $msgid_singular, string $msgid_plural, int $count, array $params = [], ?string $context = null): string {
return i18n_get_plural($msgid_singular, $msgid_plural, $count, $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);
[$meta, $msgs, $pmsgs] = i18n_parse(file_get_contents($path), $ent);
$__i18n_msg_store[$lang] = $msgs;
$__i18n_msg_store_plural[$lang] = $pmsgs;
$__i18n_msg_metadata[$lang] = $meta;
}
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